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nghttp2/lib/includes/nghttp2/nghttp2.h

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/*
* nghttp2 - HTTP/2 C Library
*
* Copyright (c) 2013, 2014 Tatsuhiro Tsujikawa
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#ifndef NGHTTP2_H
#define NGHTTP2_H
#ifdef __cplusplus
extern "C" {
#endif
#include <stdlib.h>
#include <stdint.h>
#include <sys/types.h>
#include <nghttp2/nghttp2ver.h>
/**
* @macro
*
* The protocol version identification string of this library
* supports. This identifier is used if HTTP/2 is used over TLS.
*/
#define NGHTTP2_PROTO_VERSION_ID "h2-12"
/**
* @macro
*
* The length of :macro:`NGHTTP2_PROTO_VERSION_ID`.
*/
#define NGHTTP2_PROTO_VERSION_ID_LEN 5
/**
* @macro
*
* The protocol version identification string of this library
* supports. This identifier is used if HTTP/2 is used over cleartext
* TCP.
*/
#define NGHTTP2_CLEARTEXT_PROTO_VERSION_ID "h2c-12"
/**
* @macro
*
* The length of :macro:`NGHTTP2_CLEARTEXT_PROTO_VERSION_ID`.
*/
#define NGHTTP2_CLEARTEXT_PROTO_VERSION_ID_LEN 6
struct nghttp2_session;
/**
* @struct
*
* The primary structure to hold the resources needed for a HTTP/2
* session. The details of this structure are intentionally hidden
* from the public API.
*/
typedef struct nghttp2_session nghttp2_session;
/**
* @macro
*
* The age of :type:`nghttp2_info`
*/
#define NGHTTP2_VERSION_AGE 1
/**
* @struct
*
* This struct is what `nghttp2_version()` returns. It holds
* information about the particular nghttp2 version.
*/
typedef struct {
/**
* Age of this struct. This instance of nghttp2 sets it to
* :macro:`NGHTTP2_VERSION_AGE` but a future version may bump it and
* add more struct fields at the bottom
*/
int age;
/**
* the :macro:`NGHTTP2_VERSION_NUM` number (since age ==1)
*/
int version_num;
/**
* points to the :macro:`NGHTTP2_VERSION` string (since age ==1)
*/
const char *version_str;
/**
* points to the :macro:`NGHTTP2_PROTO_VERSION_ID` string this
* instance implements (since age ==1)
*/
const char *proto_str;
/* -------- the above fields all exist when age == 1 */
} nghttp2_info;
/**
* @macro
*
* The default weight of stream dependency.
*/
#define NGHTTP2_DEFAULT_WEIGHT 16
/**
* @macro
*
* The maximum weight of stream dependency.
*/
#define NGHTTP2_MAX_WEIGHT 256
/**
* @macro
*
* The minimum weight of stream dependency.
*/
#define NGHTTP2_MIN_WEIGHT 1
/**
* @macro
*
* The maximum window size
*/
#define NGHTTP2_MAX_WINDOW_SIZE ((int32_t)((1U << 31) - 1))
/**
* @macro
*
* The initial window size for stream level flow control.
*/
#define NGHTTP2_INITIAL_WINDOW_SIZE ((1 << 16) - 1)
/**
* @macro
*
* The initial window size for connection level flow control.
*/
#define NGHTTP2_INITIAL_CONNECTION_WINDOW_SIZE ((1 << 16) - 1)
/**
* @macro
*
* The default header table size.
*/
#define NGHTTP2_DEFAULT_HEADER_TABLE_SIZE (1 << 12)
/**
* @macro
*
* The client connection preface.
*/
#define NGHTTP2_CLIENT_CONNECTION_PREFACE "PRI * HTTP/2.0\r\n\r\nSM\r\n\r\n"
/**
* @macro
*
* The length of :macro:`NGHTTP2_CLIENT_CONNECTION_PREFACE`.
*/
#define NGHTTP2_CLIENT_CONNECTION_PREFACE_LEN 24
/**
* @macro
*
* The client connection header. This macro is obsoleted by
* NGHTTP2_CLIENT_CONNECTION_PREFACE.
*/
#define NGHTTP2_CLIENT_CONNECTION_HEADER NGHTTP2_CLIENT_CONNECTION_PREFACE
/**
* @macro
*
* The length of :macro:`NGHTTP2_CLIENT_CONNECTION_HEADER`.
*/
#define NGHTTP2_CLIENT_CONNECTION_HEADER_LEN \
NGHTTP2_CLIENT_CONNECTION_PREFACE_LEN
/**
* @enum
*
* Error codes used in this library. The code range is [-999, -500],
* inclusive. The following values are defined:
*/
typedef enum {
/**
* Invalid argument passed.
*/
NGHTTP2_ERR_INVALID_ARGUMENT = -501,
/**
* Ouf of buffer space.
*/
NGHTTP2_ERR_BUFFER_ERROR = -502,
/**
* The specified protocol version is not supported.
*/
NGHTTP2_ERR_UNSUPPORTED_VERSION = -503,
/**
* Used as a return value from :type:`nghttp2_send_callback` and
* :type:`nghttp2_recv_callback` to indicate that the operation
* would block.
*/
NGHTTP2_ERR_WOULDBLOCK = -504,
/**
* General protocol error
*/
NGHTTP2_ERR_PROTO = -505,
/**
* The frame is invalid.
*/
NGHTTP2_ERR_INVALID_FRAME = -506,
/**
* The peer performed a shutdown on the connection.
*/
NGHTTP2_ERR_EOF = -507,
/**
* Used as a return value from
* :func:`nghttp2_data_source_read_callback` to indicate that data
* transfer is postponed. See
* :func:`nghttp2_data_source_read_callback` for details.
*/
NGHTTP2_ERR_DEFERRED = -508,
/**
* Stream ID has reached the maximum value. Therefore no stream ID
* is available.
*/
NGHTTP2_ERR_STREAM_ID_NOT_AVAILABLE = -509,
/**
* The stream is already closed; or the stream ID is invalid.
*/
NGHTTP2_ERR_STREAM_CLOSED = -510,
/**
* RST_STREAM has been added to the outbound queue. The stream is
* in closing state.
*/
NGHTTP2_ERR_STREAM_CLOSING = -511,
/**
* The transmission is not allowed for this stream (e.g., a frame
* with END_STREAM flag set has already sent).
*/
NGHTTP2_ERR_STREAM_SHUT_WR = -512,
/**
* The stream ID is invalid.
*/
NGHTTP2_ERR_INVALID_STREAM_ID = -513,
/**
* The state of the stream is not valid (e.g., DATA cannot be sent
* to the stream if response HEADERS has not been sent).
*/
NGHTTP2_ERR_INVALID_STREAM_STATE = -514,
/**
* Another DATA frame has already been deferred.
*/
NGHTTP2_ERR_DEFERRED_DATA_EXIST = -515,
/**
* Starting new stream is not allowed (e.g., GOAWAY has been sent
* and/or received).
*/
NGHTTP2_ERR_START_STREAM_NOT_ALLOWED = -516,
/**
* GOAWAY has already been sent.
*/
NGHTTP2_ERR_GOAWAY_ALREADY_SENT = -517,
/**
* The received frame contains the invalid header block (e.g., There
* are duplicate header names; or the header names are not encoded
* in US-ASCII character set and not lower cased; or the header name
* is zero-length string; or the header value contains multiple
* in-sequence NUL bytes).
*/
NGHTTP2_ERR_INVALID_HEADER_BLOCK = -518,
/**
* Indicates that the context is not suitable to perform the
* requested operation.
*/
NGHTTP2_ERR_INVALID_STATE = -519,
/**
* The user callback function failed due to the temporal error.
*/
NGHTTP2_ERR_TEMPORAL_CALLBACK_FAILURE = -521,
/**
* The length of the frame is invalid, either too large or too small.
*/
NGHTTP2_ERR_FRAME_SIZE_ERROR = -522,
/**
* Header block inflate/deflate error.
*/
NGHTTP2_ERR_HEADER_COMP = -523,
/**
* Flow control error
*/
NGHTTP2_ERR_FLOW_CONTROL = -524,
/**
* Insufficient buffer size given to function.
*/
NGHTTP2_ERR_INSUFF_BUFSIZE = -525,
/**
* Callback was paused by the application
*/
NGHTTP2_ERR_PAUSE = -526,
/**
* There are too many in-flight SETTING frame and no more
* transmission of SETTINGS is allowed.
*/
NGHTTP2_ERR_TOO_MANY_INFLIGHT_SETTINGS = -527,
/**
* The server push is disabled.
*/
NGHTTP2_ERR_PUSH_DISABLED = -528,
/**
* DATA frame for a given stream has been already submitted and has
* not been fully processed yet.
*/
NGHTTP2_ERR_DATA_EXIST = -529,
/**
* The errors < :enum:`NGHTTP2_ERR_FATAL` mean that the library is
* under unexpected condition and processing was terminated (e.g.,
* out of memory). If application receives this error code, it must
* stop using that :type:`nghttp2_session` object and only allowed
* operation for that object is deallocate it using
* `nghttp2_session_del()`.
*/
NGHTTP2_ERR_FATAL = -900,
/**
* Out of memory. This is a fatal error.
*/
NGHTTP2_ERR_NOMEM = -901,
/**
* The user callback function failed. This is a fatal error.
*/
NGHTTP2_ERR_CALLBACK_FAILURE = -902
} nghttp2_error;
typedef enum {
NGHTTP2_MSG_MORE
} nghttp2_io_flag;
/**
* @enum
*
* The flags for header field name/value pair.
*/
typedef enum {
/**
* No flag set.
*/
NGHTTP2_NV_FLAG_NONE = 0,
/**
* Indicates that this name/value pair must not be indexed.
*/
NGHTTP2_NV_FLAG_NO_INDEX = 0x01
} nghttp2_nv_flag;
/**
* @struct
*
* The name/value pair, which mainly used to represent header fields.
*/
typedef struct {
/**
* The |name| byte string, which is not necessarily ``NULL``
* terminated.
*/
uint8_t *name;
/**
* The |value| byte string, which is not necessarily ``NULL``
* terminated.
*/
uint8_t *value;
/**
* The length of the |name|.
*/
size_t namelen;
/**
* The length of the |value|.
*/
size_t valuelen;
/**
* Bitwise OR of one or more of :type:`nghttp2_nv_flag`.
*/
uint8_t flags;
} nghttp2_nv;
/**
* @enum
* The control frame types in HTTP/2.
*/
typedef enum {
/**
* The DATA frame.
*/
NGHTTP2_DATA = 0,
/**
* The HEADERS frame.
*/
NGHTTP2_HEADERS = 0x01,
/**
* The PRIORITY frame.
*/
NGHTTP2_PRIORITY = 0x02,
/**
* The RST_STREAM frame.
*/
NGHTTP2_RST_STREAM = 0x03,
/**
* The SETTINGS frame.
*/
NGHTTP2_SETTINGS = 0x04,
/**
* The PUSH_PROMISE frame.
*/
NGHTTP2_PUSH_PROMISE = 0x05,
/**
* The PING frame.
*/
NGHTTP2_PING = 0x06,
/**
* The GOAWAY frame.
*/
NGHTTP2_GOAWAY = 0x07,
/**
* The WINDOW_UPDATE frame.
*/
NGHTTP2_WINDOW_UPDATE = 0x08,
/**
* The CONTINUATION frame.
*/
NGHTTP2_CONTINUATION = 0x09,
/**
* The ALTSVC frame.
*/
NGHTTP2_ALTSVC = 0x0a,
/**
* The BLOCKED frame.
*/
NGHTTP2_BLOCKED = 0x0b
} nghttp2_frame_type;
/**
* @enum
*
* The flags for HTTP/2 frames. This enum defines all flags for all
* frames.
*/
typedef enum {
/**
* No flag set.
*/
NGHTTP2_FLAG_NONE = 0,
/**
* The END_STREAM flag.
*/
NGHTTP2_FLAG_END_STREAM = 0x01,
/**
* The END_HEADERS flag.
*/
NGHTTP2_FLAG_END_HEADERS = 0x04,
/**
* The ACK flag.
*/
NGHTTP2_FLAG_ACK = 0x01,
/**
* The END_SEGMENT flag.
*/
NGHTTP2_FLAG_END_SEGMENT = 0x02,
/**
* The PAD_LOW flag.
*/
NGHTTP2_FLAG_PAD_LOW = 0x08,
/**
* The PAD_HIGH flag.
*/
NGHTTP2_FLAG_PAD_HIGH = 0x10,
/**
* The PRIORITY flag.
*/
NGHTTP2_FLAG_PRIORITY = 0x20
} nghttp2_flag;
/**
* @enum
* The SETTINGS ID.
*/
typedef enum {
/**
* SETTINGS_HEADER_TABLE_SIZE
*/
NGHTTP2_SETTINGS_HEADER_TABLE_SIZE = 1,
/**
* SETTINGS_ENABLE_PUSH
*/
NGHTTP2_SETTINGS_ENABLE_PUSH = 2,
/**
* SETTINGS_MAX_CONCURRENT_STREAMS
*/
NGHTTP2_SETTINGS_MAX_CONCURRENT_STREAMS = 3,
/**
* SETTINGS_INITIAL_WINDOW_SIZE
*/
NGHTTP2_SETTINGS_INITIAL_WINDOW_SIZE = 4,
/**
* Maximum ID of :type:`nghttp2_settings_id`.
*/
NGHTTP2_SETTINGS_MAX = 4
} nghttp2_settings_id;
/**
* @macro
* Default maximum concurrent streams.
*/
#define NGHTTP2_INITIAL_MAX_CONCURRENT_STREAMS ((1U << 31) - 1)
/**
* @enum
* The status codes for the RST_STREAM and GOAWAY frames.
*/
typedef enum {
/**
* No errors.
*/
NGHTTP2_NO_ERROR = 0,
/**
* PROTOCOL_ERROR
*/
NGHTTP2_PROTOCOL_ERROR = 1,
/**
* INTERNAL_ERROR
*/
NGHTTP2_INTERNAL_ERROR = 2,
/**
* FLOW_CONTROL_ERROR
*/
NGHTTP2_FLOW_CONTROL_ERROR = 3,
/**
* SETTINGS_TIMEOUT
*/
NGHTTP2_SETTINGS_TIMEOUT = 4,
/**
* STREAM_CLOSED
*/
NGHTTP2_STREAM_CLOSED = 5,
/**
* FRAME_SIZE_ERROR
*/
NGHTTP2_FRAME_SIZE_ERROR = 6,
/**
* REFUSED_STREAM
*/
NGHTTP2_REFUSED_STREAM = 7,
/**
* CANCEL
*/
NGHTTP2_CANCEL = 8,
/**
* COMPRESSION_ERROR
*/
NGHTTP2_COMPRESSION_ERROR = 9,
/**
* CONNECT_ERROR
*/
NGHTTP2_CONNECT_ERROR = 10,
/**
* ENHANCE_YOUR_CALM
*/
NGHTTP2_ENHANCE_YOUR_CALM = 11,
/**
* INADEQUATE_SECURITY
*/
NGHTTP2_INADEQUATE_SECURITY = 12
} nghttp2_error_code;
/**
* @struct
* The frame header.
*/
typedef struct {
/**
* The length field of this frame, excluding frame header.
*/
size_t length;
/**
* The stream identifier (aka, stream ID)
*/
int32_t stream_id;
/**
* The type of this frame. See `nghttp2_frame`.
*/
uint8_t type;
/**
* The flags.
*/
uint8_t flags;
} nghttp2_frame_hd;
/**
* @union
*
* This union represents the some kind of data source passed to
* :type:`nghttp2_data_source_read_callback`.
*/
typedef union {
/**
* The integer field, suitable for a file descriptor.
*/
int fd;
/**
* The pointer to an arbitrary object.
*/
void *ptr;
} nghttp2_data_source;
/**
* @enum
*
* The flags used to set in |data_flags| output parameter in
* :type:`nghttp2_data_source_read_callback`.
*/
typedef enum {
/**
* No flag set.
*/
NGHTTP2_DATA_FLAG_NONE = 0,
/**
* Indicates EOF was sensed.
*/
NGHTTP2_DATA_FLAG_EOF = 0x01
} nghttp2_data_flag;
/**
* @functypedef
*
* Callback function invoked when the library wants to read data from
* the |source|. The read data is sent in the stream |stream_id|.
* The implementation of this function must read at most |length|
* bytes of data from |source| (or possibly other places) and store
* them in |buf| and return number of data stored in |buf|. If EOF is
* reached, set :enum:`NGHTTP2_DATA_FLAG_EOF` flag in |*data_flags|.
*
* If the application wants to postpone DATA frames (e.g.,
* asynchronous I/O, or reading data blocks for long time), it is
* achieved by returning :enum:`NGHTTP2_ERR_DEFERRED` without reading
* any data in this invocation. The library removes DATA frame from
* the outgoing queue temporarily. To move back deferred DATA frame
* to outgoing queue, call `nghttp2_session_resume_data()`. In case
* of error, there are 2 choices. Returning
* :enum:`NGHTTP2_ERR_TEMPORAL_CALLBACK_FAILURE` will close the stream
* by issuing RST_STREAM with :enum:`NGHTTP2_INTERNAL_ERROR`.
* Returning :enum:`NGHTTP2_ERR_CALLBACK_FAILURE` will signal the
* entire session failure.
*/
typedef ssize_t (*nghttp2_data_source_read_callback)
(nghttp2_session *session, int32_t stream_id,
uint8_t *buf, size_t length, uint32_t *data_flags,
nghttp2_data_source *source, void *user_data);
/**
* @struct
*
* This struct represents the data source and the way to read a chunk
* of data from it.
*/
typedef struct {
/**
* The data source.
*/
nghttp2_data_source source;
/**
* The callback function to read a chunk of data from the |source|.
*/
nghttp2_data_source_read_callback read_callback;
} nghttp2_data_provider;
/**
* @struct
*
* The DATA frame. The received data is delivered via
* :type:`nghttp2_on_data_chunk_recv_callback`.
*/
typedef struct {
nghttp2_frame_hd hd;
/**
* The length of the padding in this frame. This includes PAD_HIGH
* and PAD_LOW.
*/
size_t padlen;
} nghttp2_data;
/**
* @enum
*
* The category of HEADERS, which indicates the role of the frame. In
* HTTP/2 spec, request, response, push response and other arbitrary
* headers (e.g., trailers) are all called just HEADERS. To give the
* application the role of incoming HEADERS frame, we define several
* categories.
*/
typedef enum {
/**
* The HEADERS frame is opening new stream, which is analogous to
* SYN_STREAM in SPDY.
*/
NGHTTP2_HCAT_REQUEST = 0,
/**
* The HEADERS frame is the first response headers, which is
* analogous to SYN_REPLY in SPDY.
*/
NGHTTP2_HCAT_RESPONSE = 1,
/**
* The HEADERS frame is the first headers sent against reserved
* stream.
*/
NGHTTP2_HCAT_PUSH_RESPONSE = 2,
/**
* The HEADERS frame which does not apply for the above categories,
* which is analogous to HEADERS in SPDY.
*/
NGHTTP2_HCAT_HEADERS = 3
} nghttp2_headers_category;
/**
* @struct
*
* The structure to specify stream dependency.
*/
typedef struct {
/**
* The stream ID of the stream to depend on. Specifying 0 makes
* stream not depend any other stream.
*/
int32_t stream_id;
/**
* The weight of this dependency.
*/
int32_t weight;
/**
* nonzero means exclusive dependency
*/
uint8_t exclusive;
} nghttp2_priority_spec;
/**
* @struct
*
* The HEADERS frame. It has the following members:
*/
typedef struct {
/**
* The frame header.
*/
nghttp2_frame_hd hd;
/**
* The length of the padding in this frame. This includes PAD_HIGH
* and PAD_LOW.
*/
size_t padlen;
/**
* The priority specification
*/
nghttp2_priority_spec pri_spec;
/**
* The name/value pairs.
*/
nghttp2_nv *nva;
/**
* The number of name/value pairs in |nva|.
*/
size_t nvlen;
/**
* The category of this HEADERS frame.
*/
nghttp2_headers_category cat;
} nghttp2_headers;
/**
* @struct
*
* The PRIORITY frame. It has the following members:
*/
typedef struct {
/**
* The frame header.
*/
nghttp2_frame_hd hd;
/**
* The priority specification.
*/
nghttp2_priority_spec pri_spec;
} nghttp2_priority;
/**
* @struct
*
* The RST_STREAM frame. It has the following members:
*/
typedef struct {
/**
* The frame header.
*/
nghttp2_frame_hd hd;
/**
* The error code. See :type:`nghttp2_error_code`.
*/
nghttp2_error_code error_code;
} nghttp2_rst_stream;
/**
* @struct
*
* The SETTINGS ID/Value pair. It has the following members:
*/
typedef struct {
/**
* The SETTINGS ID. See :type:`nghttp2_settings_id`.
*/
int32_t settings_id;
/**
* The value of this entry.
*/
uint32_t value;
} nghttp2_settings_entry;
/**
* @struct
*
* The SETTINGS frame. It has the following members:
*/
typedef struct {
/**
* The frame header.
*/
nghttp2_frame_hd hd;
/**
* The number of SETTINGS ID/Value pairs in |iv|.
*/
size_t niv;
/**
* The pointer to the array of SETTINGS ID/Value pair.
*/
nghttp2_settings_entry *iv;
} nghttp2_settings;
/**
* @struct
*
* The PUSH_PROMISE frame. It has the following members:
*/
typedef struct {
/**
* The frame header.
*/
nghttp2_frame_hd hd;
/**
* The length of the padding in this frame. This includes PAD_HIGH
* and PAD_LOW.
*/
size_t padlen;
/**
* The name/value pairs.
*/
nghttp2_nv *nva;
/**
* The number of name/value pairs in |nva|.
*/
size_t nvlen;
/**
* The promised stream ID
*/
int32_t promised_stream_id;
} nghttp2_push_promise;
/**
* @struct
*
* The PING frame. It has the following members:
*/
typedef struct {
/**
* The frame header.
*/
nghttp2_frame_hd hd;
/**
* The opaque data
*/
uint8_t opaque_data[8];
} nghttp2_ping;
/**
* @struct
*
* The GOAWAY frame. It has the following members:
*/
typedef struct {
/**
* The frame header.
*/
nghttp2_frame_hd hd;
/**
* The last stream stream ID.
*/
int32_t last_stream_id;
/**
* The error code. See :type:`nghttp2_error_code`.
*/
nghttp2_error_code error_code;
/**
* The additional debug data
*/
uint8_t *opaque_data;
/**
* The length of |opaque_data| member.
*/
size_t opaque_data_len;
} nghttp2_goaway;
/**
* @struct
*
* The WINDOW_UPDATE frame. It has the following members:
*/
typedef struct {
/**
* The frame header.
*/
nghttp2_frame_hd hd;
/**
* The window size increment.
*/
int32_t window_size_increment;
} nghttp2_window_update;
/**
* @struct
*
* The ALTSVC frame. It has following members:
*/
typedef struct {
/**
* The frame header.
*/
nghttp2_frame_hd hd;
/**
* Protocol ID
*/
uint8_t *protocol_id;
/**
* Host
*/
uint8_t *host;
/**
* Origin
*/
uint8_t *origin;
/**
* The length of |protocol_id|
*/
size_t protocol_id_len;
/**
* The length of |host|
*/
size_t host_len;
/**
* The length of |origin|
*/
size_t origin_len;
/**
* Max-Age
*/
uint32_t max_age;
/**
* Port
*/
uint16_t port;
} nghttp2_altsvc;
/**
* @struct
*
* The BLOCKED frame. It has following members:
*/
typedef struct {
/**
* The frame header.
*/
nghttp2_frame_hd hd;
} nghttp2_blocked;
/**
* @union
*
* This union includes all frames to pass them to various function
* calls as nghttp2_frame type. The CONTINUATION frame is omitted
* from here because the library deals with it internally.
*/
typedef union {
/**
* The frame header, which is convenient to inspect frame header.
*/
nghttp2_frame_hd hd;
/**
* The DATA frame.
*/
nghttp2_data data;
/**
* The HEADERS frame.
*/
nghttp2_headers headers;
/**
* The PRIORITY frame.
*/
nghttp2_priority priority;
/**
* The RST_STREAM frame.
*/
nghttp2_rst_stream rst_stream;
/**
* The SETTINGS frame.
*/
nghttp2_settings settings;
/**
* The PUSH_PROMISE frame.
*/
nghttp2_push_promise push_promise;
/**
* The PING frame.
*/
nghttp2_ping ping;
/**
* The GOAWAY frame.
*/
nghttp2_goaway goaway;
/**
* The WINDOW_UPDATE frame.
*/
nghttp2_window_update window_update;
/**
* The ALTSVC frame.
*/
nghttp2_altsvc altsvc;
/**
* The BLOCKED frame.
*/
nghttp2_blocked blocked;
} nghttp2_frame;
/**
* @functypedef
*
* Callback function invoked when |session| wants to send data to the
* remote peer. The implementation of this function must send at most
* |length| bytes of data stored in |data|. The |flags| is currently
* not used and always 0. It must return the number of bytes sent if
* it succeeds. If it cannot send any single byte without blocking,
* it must return :enum:`NGHTTP2_ERR_WOULDBLOCK`. For other errors,
* it must return :enum:`NGHTTP2_ERR_CALLBACK_FAILURE`. The
* |user_data| pointer is the third argument passed in to the call to
* `nghttp2_session_client_new()` or `nghttp2_session_server_new()`.
*
* This callback is required if the application uses
* `nghttp2_session_send()` to send data to the remote endpoint. If
* the application uses solely `nghttp2_session_mem_send()` instead,
* this callback function is unnecessary.
*/
typedef ssize_t (*nghttp2_send_callback)
(nghttp2_session *session,
const uint8_t *data, size_t length, int flags, void *user_data);
/**
* @functypedef
*
* Callback function invoked when |session| wants to receive data from
* the remote peer. The implementation of this function must read at
* most |length| bytes of data and store it in |buf|. The |flags| is
* currently not used and always 0. It must return the number of
* bytes written in |buf| if it succeeds. If it cannot read any
* single byte without blocking, it must return
* :enum:`NGHTTP2_ERR_WOULDBLOCK`. If it gets EOF before it reads any
* single byte, it must return :enum:`NGHTTP2_ERR_EOF`. For other
* errors, it must return :enum:`NGHTTP2_ERR_CALLBACK_FAILURE`.
* Returning 0 is treated as :enum:`NGHTTP2_ERR_WOULDBLOCK`. The
* |user_data| pointer is the third argument passed in to the call to
* `nghttp2_session_client_new()` or `nghttp2_session_server_new()`.
*
* This callback is required if the application uses
* `nghttp2_session_recv()` to receive data from the remote endpoint.
* If the application uses solely `nghttp2_session_mem_recv()`
* instead, this callback function is unnecessary.
*/
typedef ssize_t (*nghttp2_recv_callback)
(nghttp2_session *session,
uint8_t *buf, size_t length, int flags, void *user_data);
/**
* @functypedef
*
* Callback function invoked by `nghttp2_session_recv()` when a frame
* is received. The |user_data| pointer is the third argument passed
* in to the call to `nghttp2_session_client_new()` or
* `nghttp2_session_server_new()`.
*
* If frame is HEADERS or PUSH_PROMISE, the ``nva`` and ``nvlen``
* member of their data structure are always ``NULL`` and 0
* respectively. The header name/value pairs are emitted via
* :type:`nghttp2_on_header_callback`.
*
* For HEADERS, PUSH_PROMISE and DATA frames, this callback may be
* called after stream is closed (see
* :type:`nghttp2_on_stream_close_callback`). The application should
* check that stream is still alive using its own stream management or
* :func:`nghttp2_session_get_stream_user_data()`.
*
* Only HEADERS and DATA frame can signal the end of incoming data.
* If ``frame->hd.flags & NGHTTP2_FLAG_END_STREAM`` is nonzero, the
* |frame| is the last frame from the remote peer in this stream.
*
* The implementation of this function must return 0 if it succeeds.
* If nonzero value is returned, it is treated as fatal error and
* `nghttp2_session_recv()` and `nghttp2_session_mem_recv()` functions
* immediately return :enum:`NGHTTP2_ERR_CALLBACK_FAILURE`.
*/
typedef int (*nghttp2_on_frame_recv_callback)
(nghttp2_session *session, const nghttp2_frame *frame, void *user_data);
/**
* @functypedef
*
* Callback function invoked by `nghttp2_session_recv()` when an
* invalid non-DATA frame is received. The |error_code| is one of the
* :enum:`nghttp2_error_code` and indicates the error. When this
* callback function is invoked, the library automatically submits
* either RST_STREAM or GOAWAY frame. The |user_data| pointer is the
* third argument passed in to the call to
* `nghttp2_session_client_new()` or `nghttp2_session_server_new()`.
*
* If frame is HEADERS or PUSH_PROMISE, the ``nva`` and ``nvlen``
* member of their data structure are always ``NULL`` and 0
* respectively.
*
* The implementation of this function must return 0 if it succeeds.
* If nonzero is returned, it is treated as fatal error and
* `nghttp2_session_recv()` and `nghttp2_session_send()` functions
* immediately return :enum:`NGHTTP2_ERR_CALLBACK_FAILURE`.
*/
typedef int (*nghttp2_on_invalid_frame_recv_callback)
(nghttp2_session *session, const nghttp2_frame *frame,
nghttp2_error_code error_code, void *user_data);
/**
* @functypedef
*
* Callback function invoked when a chunk of data in DATA frame is
* received. The |stream_id| is the stream ID this DATA frame belongs
* to. The |flags| is the flags of DATA frame which this data chunk
* is contained. ``(flags & NGHTTP2_FLAG_END_STREAM) != 0`` does not
* necessarily mean this chunk of data is the last one in the stream.
* You should use :type:`nghttp2_on_frame_recv_callback` to know all
* data frames are received. The |user_data| pointer is the third
* argument passed in to the call to `nghttp2_session_client_new()` or
* `nghttp2_session_server_new()`.
*
* If the application uses `nghttp2_session_mem_recv()`, it can return
* :enum:`NGHTTP2_ERR_PAUSE` to make `nghttp2_session_mem_recv()`
* return without processing further input bytes. The memory by
* pointed by the |data| is retained until
* `nghttp2_session_mem_recv()` or `nghttp2_session_recv()` is called.
* The application must retain the input bytes which was used to
* produce the |data| parameter, because it may refer to the memory
* region included in the input bytes.
*
* The implementation of this function must return 0 if it succeeds.
* If nonzero is returned, it is treated as fatal error and
* `nghttp2_session_recv()` and `nghttp2_session_mem_recv()` functions
* immediately return :enum:`NGHTTP2_ERR_CALLBACK_FAILURE`.
*/
typedef int (*nghttp2_on_data_chunk_recv_callback)
(nghttp2_session *session, uint8_t flags, int32_t stream_id,
const uint8_t *data, size_t len, void *user_data);
/**
* @functypedef
*
* Callback function invoked just before the non-DATA frame |frame| is
* sent. The |user_data| pointer is the third argument passed in to
* the call to `nghttp2_session_client_new()` or
* `nghttp2_session_server_new()`.
*
* The implementation of this function must return 0 if it succeeds.
* If nonzero is returned, it is treated as fatal error and
* `nghttp2_session_recv()` and `nghttp2_session_send()` functions
* immediately return :enum:`NGHTTP2_ERR_CALLBACK_FAILURE`.
*/
typedef int (*nghttp2_before_frame_send_callback)
(nghttp2_session *session, const nghttp2_frame *frame, void *user_data);
/**
* @functypedef
*
* Callback function invoked after the frame |frame| is sent. The
* |user_data| pointer is the third argument passed in to the call to
* `nghttp2_session_client_new()` or `nghttp2_session_server_new()`.
*
* The implementation of this function must return 0 if it succeeds.
* If nonzero is returned, it is treated as fatal error and
* `nghttp2_session_recv()` and `nghttp2_session_send()` functions
* immediately return :enum:`NGHTTP2_ERR_CALLBACK_FAILURE`.
*/
typedef int (*nghttp2_on_frame_send_callback)
(nghttp2_session *session, const nghttp2_frame *frame, void *user_data);
/**
* @functypedef
*
* Callback function invoked after the non-DATA frame |frame| is not
* sent because of the error. The error is indicated by the
* |lib_error_code|, which is one of the values defined in
* :type:`nghttp2_error`. The |user_data| pointer is the third
* argument passed in to the call to `nghttp2_session_client_new()` or
* `nghttp2_session_server_new()`.
*
* The implementation of this function must return 0 if it succeeds.
* If nonzero is returned, it is treated as fatal error and
* `nghttp2_session_recv()` and `nghttp2_session_send()` functions
* immediately return :enum:`NGHTTP2_ERR_CALLBACK_FAILURE`.
*/
typedef int (*nghttp2_on_frame_not_send_callback)
(nghttp2_session *session, const nghttp2_frame *frame, int lib_error_code,
void *user_data);
/**
* @functypedef
*
* Callback function invoked when the stream |stream_id| is closed.
* The reason of closure is indicated by the |error_code|. The
* stream_user_data, which was specified in `nghttp2_submit_request()`
* or `nghttp2_submit_headers()`, is still available in this function.
* The |user_data| pointer is the third argument passed in to the call
* to `nghttp2_session_client_new()` or
* `nghttp2_session_server_new()`.
*
* This function is also called for a stream in reserved state.
*
* The implementation of this function must return 0 if it succeeds.
* If nonzero is returned, it is treated as fatal error and
* `nghttp2_session_recv()` and `nghttp2_session_send()` functions
* immediately return :enum:`NGHTTP2_ERR_CALLBACK_FAILURE`.
*/
typedef int (*nghttp2_on_stream_close_callback)
(nghttp2_session *session, int32_t stream_id, nghttp2_error_code error_code,
void *user_data);
/**
* @functypedef
*
* Callback function invoked when the received frame type is unknown.
* The |head| is the pointer to the header of the received frame. The
* |headlen| is the length of the |head|. According to the spec, the
* |headlen| is always 8. In other words, the |head| is the first 8
* bytes of the received frame. The |payload| is the pointer to the
* data portion of the received frame. The |payloadlen| is the length
* of the |payload|. This is the data after the length field. The
* |user_data| pointer is the third argument passed in to the call to
* `nghttp2_session_client_new()` or `nghttp2_session_server_new()`.
*
* The implementation of this function must return 0 if it succeeds.
* If nonzero is returned, it is treated as fatal error and
* `nghttp2_session_recv()` and `nghttp2_session_send()` functions
* immediately return :enum:`NGHTTP2_ERR_CALLBACK_FAILURE`.
*/
typedef int (*nghttp2_on_unknown_frame_recv_callback)
(nghttp2_session *session,
const uint8_t *head, size_t headlen,
const uint8_t *payload, size_t payloadlen,
void *user_data);
/**
* @functypedef
*
* Callback function invoked when the reception of header block in
* HEADERS or PUSH_PROMISE is started. Each header name/value pair
* will be emitted by :type:`nghttp2_on_header_callback`.
*
* The ``frame->hd.flags`` may not have
* :enum:`NGHTTP2_FLAG_END_HEADERS` flag set, which indicates that one
* or more CONTINUATION frames are involved. But the application does
* not need to care about that because the header name/value pairs are
* emitted transparently regardless of CONTINUATION frames.
*
* The implementation of this function must return 0 if it succeeds or
* :enum:`NGHTTP2_ERR_CALLBACK_FAILURE`. If nonzero value other than
* :enum:`NGHTTP2_ERR_CALLBACK_FAILURE` is returned, it is treated as
* if :enum:`NGHTTP2_ERR_CALLBACK_FAILURE` is returned. If
* :enum:`NGHTTP2_ERR_CALLBACK_FAILURE` is returned,
* `nghttp2_session_mem_recv()` function will immediately return
* :enum:`NGHTTP2_ERR_CALLBACK_FAILURE`.
*/
typedef int (*nghttp2_on_begin_headers_callback)
(nghttp2_session *session, const nghttp2_frame *frame, void *user_data);
/**
* @functypedef
*
* Callback function invoked when a header name/value pair is received
* for the |frame|. The |name| of length |namelen| is header name.
* The |value| of length |valuelen| is header value. The |flags| is
* bitwise OR of one or more of :type:`nghttp2_nv_flag`.
*
* If :enum:`NGHTTP2_NV_FLAG_NO_INDEX` is set in |flags|, the receiver
* must not index this name/value pair when forwarding it to the next
* hop.
*
* When this callback is invoked, ``frame->hd.type`` is either
* :enum:`NGHTTP2_HEADERS` or :enum:`NGHTTP2_PUSH_PROMISE`. After all
* header name/value pairs are processed with this callback, and no
* error has been detected, :type:`nghttp2_on_frame_recv_callback`
* will be invoked. If there is an error in decompression,
* :type:`nghttp2_on_frame_recv_callback` for the |frame| will not be
* invoked.
*
* The |name| may be ``NULL`` if the |namelen| is 0. The same thing
* can be said about the |value|.
*
* Please note that nghttp2 library does not perform any validity
* check against the |name| and the |value|. For example, the
* |namelen| could be 0, and/or the |value| contains ``0x0a`` or
* ``0x0d``. The application must check them if it matters. The
* helper function `nghttp2_check_header_name()` and
* `nghttp2_check_header_value()` provide simple validation against
* HTTP2 header field construction rule.
*
* One more thing to note is that the |value| may contain ``NULL``
* (``0x00``) characters. It is used to concatenate header values
* which share the same header field name. The application should
* split these values if it wants to get individual value. This
* concatenation is used in order to keep the ordering of headers.
*
* If the application uses `nghttp2_session_mem_recv()`, it can return
* :enum:`NGHTTP2_ERR_PAUSE` to make `nghttp2_session_mem_recv()`
* return without processing further input bytes. The memory pointed
* by |frame|, |name| and |value| parameters are retained until
* `nghttp2_session_mem_recv()` or `nghttp2_session_recv()` is called.
* The application must retain the input bytes which was used to
* produce these parameters, because it may refer to the memory region
* included in the input bytes.
*
* Returning :enum:`NGHTTP2_ERR_TEMPORAL_CALLBACK_FAILURE` will close
* the stream by issuing RST_STREAM with
* :enum:`NGHTTP2_INTERNAL_ERROR`. In this case,
* :type:`nghttp2_on_frame_recv_callback` will not be invoked.
*
* The implementation of this function must return 0 if it succeeds.
* It may return :enum:`NGHTTP2_ERR_PAUSE` or
* :enum:`NGHTTP2_ERR_TEMPORAL_CALLBACK_FAILURE`. For other critical
* failures, it must return :enum:`NGHTTP2_ERR_CALLBACK_FAILURE`. If
* the other nonzero value is returned, it is treated as
* :enum:`NGHTTP2_ERR_CALLBACK_FAILURE`. If
* :enum:`NGHTTP2_ERR_CALLBACK_FAILURE` is returned,
* `nghttp2_session_recv()` and `nghttp2_session_mem_recv()` functions
* immediately return :enum:`NGHTTP2_ERR_CALLBACK_FAILURE`.
*/
typedef int (*nghttp2_on_header_callback)
(nghttp2_session *session,
const nghttp2_frame *frame,
const uint8_t *name, size_t namelen,
const uint8_t *value, size_t valuelen,
uint8_t flags,
void *user_data);
/**
* @functypedef
*
* Callback function invoked when the library asks application how
* many padding bytes are required for the transmission of the
* |frame|. The application must choose the total length of payload
* including padded bytes in range [frame->hd.length, max_payloadlen],
* inclusive. Choosing number not in this range will be treated as
* :enum:`NGHTTP2_ERR_CALLBACK_FAILURE`. Returning
* ``frame->hd.length`` means no padding is added. Returning
* :enum:`NGHTTP2_ERR_CALLBACK_FAILURE` will make
* `nghttp2_session_send()` function immediately return
* :enum:`NGHTTP2_ERR_CALLBACK_FAILURE`.
*/
typedef ssize_t (*nghttp2_select_padding_callback)
(nghttp2_session *session,
const nghttp2_frame *frame,
size_t max_payloadlen,
void *user_data);
/**
* @struct
*
* Callback functions.
*/
typedef struct {
/**
* Callback function invoked when the |session| wants to send data
* to the remote peer. This callback is not necessary if the
* application uses solely `nghttp2_session_mem_send()` to serialize
* data to transmit.
*/
nghttp2_send_callback send_callback;
/**
* Callback function invoked when the |session| wants to receive
* data from the remote peer. This callback is not necessary if the
* application uses solely `nghttp2_session_mem_recv()` to process
* received data.
*/
nghttp2_recv_callback recv_callback;
/**
* Callback function invoked by `nghttp2_session_recv()` when a
* frame is received.
*/
nghttp2_on_frame_recv_callback on_frame_recv_callback;
/**
* Callback function invoked by `nghttp2_session_recv()` when an
* invalid non-DATA frame is received.
*/
nghttp2_on_invalid_frame_recv_callback on_invalid_frame_recv_callback;
/**
* Callback function invoked when a chunk of data in DATA frame is
* received.
*/
nghttp2_on_data_chunk_recv_callback on_data_chunk_recv_callback;
/**
* Callback function invoked before a non-DATA frame is sent.
*/
nghttp2_before_frame_send_callback before_frame_send_callback;
/**
* Callback function invoked after a frame is sent.
*/
nghttp2_on_frame_send_callback on_frame_send_callback;
/**
* The callback function invoked when a non-DATA frame is not sent
* because of an error.
*/
nghttp2_on_frame_not_send_callback on_frame_not_send_callback;
/**
* Callback function invoked when the stream is closed.
*/
nghttp2_on_stream_close_callback on_stream_close_callback;
/**
* Callback function invoked when the received frame type is
* unknown.
*/
nghttp2_on_unknown_frame_recv_callback on_unknown_frame_recv_callback;
/**
* Callback function invoked when the reception of header block in
* HEADERS or PUSH_PROMISE is started.
*/
nghttp2_on_begin_headers_callback on_begin_headers_callback;
/**
* Callback function invoked when a header name/value pair is
* received.
*/
nghttp2_on_header_callback on_header_callback;
/**
* Callback function invoked when the library asks application how
* many padding bytes are required for the transmission of the given
* frame.
*/
nghttp2_select_padding_callback select_padding_callback;
} nghttp2_session_callbacks;
struct nghttp2_option;
/**
* @struct
*
* Configuration options for :type:`nghttp2_session`. The details of
* this structure are intentionally hidden from the public API.
*/
typedef struct nghttp2_option nghttp2_option;
/**
* @function
*
* Initializes |*option_ptr| with default values.
*
* When the application finished using this object, it can use
* `nghttp2_option_del()` to free its memory.
*
* This function returns 0 if it succeeds, or one of the following
* negative error codes:
*
* :enum:`NGHTTP2_ERR_NOMEM`
* Out of memory.
*/
int nghttp2_option_new(nghttp2_option **option_ptr);
/**
* @function
*
* Frees any resources allocated for |option|. If |option| is
* ``NULL``, this function does nothing.
*/
void nghttp2_option_del(nghttp2_option *option);
/**
* @function
*
* This option prevents the library from sending WINDOW_UPDATE for a
* stream automatically. If this option is set to nonzero, the
* library won't send WINDOW_UPDATE for a stream and the application
* is responsible for sending WINDOW_UPDATE using
* `nghttp2_submit_window_update`. By default, this option is set to
* zero.
*/
void nghttp2_option_set_no_auto_stream_window_update(nghttp2_option *option,
int val);
/**
* @function
*
* This option prevents the library from sending WINDOW_UPDATE for a
* connection automatically. If this option is set to nonzero, the
* library won't send WINDOW_UPDATE for a connection and the
* application is responsible for sending WINDOW_UPDATE with stream ID
* 0 using `nghttp2_submit_window_update`. By default, this option is
* set to zero.
*/
void nghttp2_option_set_no_auto_connection_window_update
(nghttp2_option *option, int val);
/**
* @function
*
* This option sets the SETTINGS_MAX_CONCURRENT_STREAMS value of
* remote endpoint as if it is received in SETTINGS frame. Without
* specifying this option, before the local endpoint receives
* SETTINGS_MAX_CONCURRENT_STREAMS in SETTINGS frame from remote
* endpoint, SETTINGS_MAX_CONCURRENT_STREAMS is unlimited. This may
* cause problem if local endpoint submits lots of requests initially
* and sending them at once to the remote peer may lead to the
* rejection of some requests. Specifying this option to the sensible
* value, say 100, may avoid this kind of issue. This value will be
* overwritten if the local endpoint receives
* SETTINGS_MAX_CONCURRENT_STREAMS from the remote endpoint.
*/
void nghttp2_option_set_peer_max_concurrent_streams(nghttp2_option *option,
uint32_t val);
/**
* @function
*
* Initializes |*session_ptr| for client use. The all members of
* |callbacks| are copied to |*session_ptr|. Therefore |*session_ptr|
* does not store |callbacks|. The |user_data| is an arbitrary user
* supplied data, which will be passed to the callback functions.
*
* The :member:`nghttp2_session_callbacks.send_callback` must be
* specified. If the application code uses `nghttp2_session_recv()`,
* the :member:`nghttp2_session_callbacks.recv_callback` must be
* specified. The other members of |callbacks| can be ``NULL``.
*
* This function returns 0 if it succeeds, or one of the following
* negative error codes:
*
* :enum:`NGHTTP2_ERR_NOMEM`
* Out of memory.
*/
int nghttp2_session_client_new(nghttp2_session **session_ptr,
const nghttp2_session_callbacks *callbacks,
void *user_data);
/**
* @function
*
* Initializes |*session_ptr| for server use. The all members of
* |callbacks| are copied to |*session_ptr|. Therefore |*session_ptr|
* does not store |callbacks|. The |user_data| is an arbitrary user
* supplied data, which will be passed to the callback functions.
*
* The :member:`nghttp2_session_callbacks.send_callback` must be
* specified. If the application code uses `nghttp2_session_recv()`,
* the :member:`nghttp2_session_callbacks.recv_callback` must be
* specified. The other members of |callbacks| can be ``NULL``.
*
* This function returns 0 if it succeeds, or one of the following
* negative error codes:
*
* :enum:`NGHTTP2_ERR_NOMEM`
* Out of memory.
*/
int nghttp2_session_server_new(nghttp2_session **session_ptr,
const nghttp2_session_callbacks *callbacks,
void *user_data);
/**
* @function
*
* Like `nghttp2_session_client_new()`, but with additional options
* specified in the |option|.
*
* The |option| can be ``NULL`` and the call is equivalent to
* `nghttp2_session_client_new()`.
*
* This function does not take ownership |option|. The application is
* responsible for freeing |option| if it finishes using the object.
*
* The library code does not refer to |option| after this function
* returns.
*
* This function returns 0 if it succeeds, or one of the following
* negative error codes:
*
* :enum:`NGHTTP2_ERR_NOMEM`
* Out of memory.
*/
int nghttp2_session_client_new2(nghttp2_session **session_ptr,
const nghttp2_session_callbacks *callbacks,
void *user_data,
const nghttp2_option *option);
/**
* @function
*
* Like `nghttp2_session_server_new()`, but with additional options
* specified in the |option|.
*
* The |option| can be ``NULL`` and the call is equivalent to
* `nghttp2_session_server_new()`.
*
* This function does not take ownership |option|. The application is
* responsible for freeing |option| if it finishes using the object.
*
* The library code does not refer to |option| after this function
* returns.
*
* This function returns 0 if it succeeds, or one of the following
* negative error codes:
*
* :enum:`NGHTTP2_ERR_NOMEM`
* Out of memory.
*/
int nghttp2_session_server_new2(nghttp2_session **session_ptr,
const nghttp2_session_callbacks *callbacks,
void *user_data,
const nghttp2_option *option);
/**
* @function
*
* Frees any resources allocated for |session|. If |session| is
* ``NULL``, this function does nothing.
*/
void nghttp2_session_del(nghttp2_session *session);
/**
* @function
*
* Sends pending frames to the remote peer.
*
* This function retrieves the highest prioritized frame from the
* outbound queue and sends it to the remote peer. It does this as
* many as possible until the user callback
* :member:`nghttp2_session_callbacks.send_callback` returns
* :enum:`NGHTTP2_ERR_WOULDBLOCK` or the outbound queue becomes empty.
* This function calls several callback functions which are passed
* when initializing the |session|. Here is the simple time chart
* which tells when each callback is invoked:
*
* 1. Get the next frame to send from outbound queue.
* 2. Prepare transmission of the frame.
* 3. If the control frame cannot be sent because some preconditions
* are not met (e.g., request HEADERS cannot be sent after GOAWAY),
* :member:`nghttp2_session_callbacks.on_frame_not_send_callback`
* is invoked. Abort the following steps.
* 4. If the frame is HEADERS, PUSH_PROMISE or DATA,
* :member:`nghttp2_session_callbacks.select_padding_callback` is
* invoked.
* 5. If the frame is request HEADERS, the stream is opened here.
* 6. :member:`nghttp2_session_callbacks.before_frame_send_callback` is
* invoked.
* 7. :member:`nghttp2_session_callbacks.send_callback` is invoked one
* or more times to send the frame.
* 8. :member:`nghttp2_session_callbacks.on_frame_send_callback` is
* invoked.
* 9. If the transmission of the frame triggers closure of the stream,
* the stream is closed and
* :member:`nghttp2_session_callbacks.on_stream_close_callback` is
* invoked.
*
* This function returns 0 if it succeeds, or one of the following
* negative error codes:
*
* :enum:`NGHTTP2_ERR_NOMEM`
* Out of memory.
* :enum:`NGHTTP2_ERR_CALLBACK_FAILURE`
* The callback function failed.
*/
int nghttp2_session_send(nghttp2_session *session);
/**
* @function
*
* Returns the serialized data to send.
*
* This function behaves like `nghttp2_session_send()` except that it
* does not use :member:`nghttp2_session_callbacks.send_callback` to
* transmit data. Instead, it assigns the pointer to the serialized
* data to the |*data_ptr| and returns its length. The other
* callbacks are called in the same way as they are in
* `nghttp2_session_send()`.
*
* If no data is available to send, this function returns 0.
*
* This function may not return all serialized data in one invocation.
* To get all data, call this function repeatedly until it returns 0
* or one of negative error codes.
*
* The assigned |*data_ptr| is valid until the next call of
* `nghttp2_session_mem_send()` or `nghttp2_session_send()`.
*
* The caller must send all data before sending the next chunk of
* data.
*
* This function returns the length of the data pointed by the
* |*data_ptr| if it succeeds, or one of the following negative error
* codes:
*
* :enum:`NGHTTP2_ERR_NOMEM`
* Out of memory.
*/
ssize_t nghttp2_session_mem_send(nghttp2_session *session,
const uint8_t **data_ptr);
/**
* @function
*
* Receives frames from the remote peer.
*
* This function receives as many frames as possible until the user
* callback :member:`nghttp2_session_callbacks.recv_callback` returns
* :enum:`NGHTTP2_ERR_WOULDBLOCK`. This function calls several
* callback functions which are passed when initializing the
* |session|. Here is the simple time chart which tells when each
* callback is invoked:
*
* 1. :member:`nghttp2_session_callbacks.recv_callback` is invoked one
* or more times to receive frame header.
* 2. If the frame is DATA frame:
*
* 1. :member:`nghttp2_session_callbacks.recv_callback` is invoked
* to receive DATA payload. For each chunk of data,
* :member:`nghttp2_session_callbacks.on_data_chunk_recv_callback`
* is invoked.
* 2. If one DATA frame is completely received,
* :member:`nghttp2_session_callbacks.on_frame_recv_callback` is
* invoked. If the reception of the frame triggers the
* closure of the stream,
* :member:`nghttp2_session_callbacks.on_stream_close_callback`
* is invoked.
*
* 3. If the frame is the control frame:
*
* 1. :member:`nghttp2_session_callbacks.recv_callback` is invoked
* one or more times to receive whole frame.
*
* 2. If the received frame is valid, then following actions are
* taken. If the frame is either HEADERS or PUSH_PROMISE,
* :member:`nghttp2_session_callbacks.on_begin_headers_callback`
* is invoked. Then
* :member:`nghttp2_session_callbacks.on_header_callback` is
* invoked for each header name/value pair. After all name/value
* pairs are emitted successfully,
* :member:`nghttp2_session_callbacks.on_frame_recv_callback` is
* invoked. For other frames,
* :member:`nghttp2_session_callbacks.on_frame_recv_callback` is
* invoked.
* If the reception of the frame triggers the closure of the
* stream,
* :member:`nghttp2_session_callbacks.on_stream_close_callback`
* is invoked.
* 3. If the received frame is unpacked but is interpreted as
* invalid,
* :member:`nghttp2_session_callbacks.on_invalid_frame_recv_callback`
* is invoked.
* 4. If the received frame type is unknown,
* :member:`nghttp2_session_callbacks.on_unknown_frame_recv_callback`
* is invoked.
*
* This function returns 0 if it succeeds, or one of the following
* negative error codes:
*
* :enum:`NGHTTP2_ERR_EOF`
* The remote peer did shutdown on the connection.
* :enum:`NGHTTP2_ERR_NOMEM`
* Out of memory.
* :enum:`NGHTTP2_ERR_CALLBACK_FAILURE`
* The callback function failed.
*/
int nghttp2_session_recv(nghttp2_session *session);
/**
* @function
*
* Processes data |in| as an input from the remote endpoint. The
* |inlen| indicates the number of bytes in the |in|.
*
* This function behaves like `nghttp2_session_recv()` except that it
* does not use :member:`nghttp2_session_callbacks.recv_callback` to
* receive data; the |in| is the only data for the invocation of this
* function. If all bytes are processed, this function returns. The
* other callbacks are called in the same way as they are in
* `nghttp2_session_recv()`.
*
* In the current implementation, this function always tries to
* processes all input data unless either an error occurs or
* :enum:`NGHTTP2_ERR_PAUSE` is returned from
* :member:`nghttp2_session_callbacks.on_header_callback` or
* :member:`nghttp2_session_callbacks.on_data_chunk_recv_callback`.
* If :enum:`NGHTTP2_ERR_PAUSE` is used, the return value includes the
* number of bytes which was used to produce the data or frame for the
* callback.
*
* This function returns the number of processed bytes, or one of the
* following negative error codes:
*
* :enum:`NGHTTP2_ERR_NOMEM`
* Out of memory.
* :enum:`NGHTTP2_ERR_CALLBACK_FAILURE`
* The callback function failed.
*/
ssize_t nghttp2_session_mem_recv(nghttp2_session *session,
const uint8_t *in, size_t inlen);
/**
* @function
*
* Puts back previously deferred DATA frame in the stream |stream_id|
* to the outbound queue.
*
* This function returns 0 if it succeeds, or one of the following
* negative error codes:
*
* :enum:`NGHTTP2_ERR_INVALID_ARGUMENT`
* The stream does not exist; or no deferred data exist; or data
* was deferred by flow control.
* :enum:`NGHTTP2_ERR_NOMEM`
* Out of memory.
*/
int nghttp2_session_resume_data(nghttp2_session *session, int32_t stream_id);
/**
* @function
*
* Returns nonzero value if |session| wants to receive data from the
* remote peer.
*
* If both `nghttp2_session_want_read()` and
* `nghttp2_session_want_write()` return 0, the application should
* drop the connection.
*/
int nghttp2_session_want_read(nghttp2_session *session);
/**
* @function
*
* Returns nonzero value if |session| wants to send data to the remote
* peer.
*
* If both `nghttp2_session_want_read()` and
* `nghttp2_session_want_write()` return 0, the application should
* drop the connection.
*/
int nghttp2_session_want_write(nghttp2_session *session);
/**
* @function
*
* Returns stream_user_data for the stream |stream_id|. The
* stream_user_data is provided by `nghttp2_submit_request()`,
* `nghttp2_submit_headers()` or
* `nghttp2_session_set_stream_user_data()`. Unless it is set using
* `nghttp2_session_set_stream_user_data()`, if the stream is
* initiated by the remote endpoint, stream_user_data is always
* ``NULL``. If the stream does not exist, this function returns
* ``NULL``.
*/
void* nghttp2_session_get_stream_user_data(nghttp2_session *session,
int32_t stream_id);
/**
* @function
*
* Sets the |stream_user_data| to the stream denoted by the
* |stream_id|. If a stream user data is already set to the stream,
* it is replaced with the |stream_user_data|. It is valid to specify
* ``NULL`` in the |stream_user_data|, which nullifies the associated
* data pointer.
*
* It is valid to set the |stream_user_data| to the stream reserved by
* PUSH_PROMISE frame.
*
* This function returns 0 if it succeeds, or one of following
* negative error codes:
*
* :enum:`NGHTTP2_ERR_INVALID_ARGUMENT`
* The stream does not exist
*/
int nghttp2_session_set_stream_user_data(nghttp2_session *session,
int32_t stream_id,
void *stream_user_data);
/**
* @function
*
* Returns the number of frames in the outbound queue. This does not
* include the deferred DATA frames.
*/
size_t nghttp2_session_get_outbound_queue_size(nghttp2_session *session);
/**
* @function
*
* Returns the number of DATA payload in bytes received without
* WINDOW_UPDATE transmission for the stream |stream_id|. The local
* (receive) window size can be adjusted by
* `nghttp2_submit_window_update()`. This function takes into account
* that and returns effective data length. In particular, if the
* local window size is reduced by submitting negative
* window_size_increment with `nghttp2_submit_window_update()`, this
* function returns the number of bytes less than actually received.
*
* This function returns -1 if it fails.
*/
int32_t nghttp2_session_get_stream_effective_recv_data_length
(nghttp2_session *session, int32_t stream_id);
/**
* @function
*
* Returns the local (receive) window size for the stream |stream_id|.
* The local window size can be adjusted by
* `nghttp2_submit_window_update()`. This function takes into account
* that and returns effective window size.
*
* This function returns -1 if it fails.
*/
int32_t nghttp2_session_get_stream_effective_local_window_size
(nghttp2_session *session, int32_t stream_id);
/**
* @function
*
* Returns the number of DATA payload in bytes received without
* WINDOW_UPDATE transmission for a connection. The local (receive)
* window size can be adjusted by `nghttp2_submit_window_update()`.
* This function takes into account that and returns effective data
* length. In particular, if the local window size is reduced by
* submitting negative window_size_increment with
* `nghttp2_submit_window_update()`, this function returns the number
* of bytes less than actually received.
*
* This function returns -1 if it fails.
*/
int32_t nghttp2_session_get_effective_recv_data_length
(nghttp2_session *session);
/**
* @function
*
* Returns the local (receive) window size for a connection. The
* local window size can be adjusted by
* `nghttp2_submit_window_update()`. This function takes into account
* that and returns effective window size.
*
* This function returns -1 if it fails.
*/
int32_t nghttp2_session_get_effective_local_window_size
(nghttp2_session *session);
/**
* @function
*
* Returns the remote window size for a given stream |stream_id|.
* This is the amount of flow-controlled payload (e.g., DATA) that the
* local endpoint can send without WINDOW_UPDATE.
*
* This function returns -1 if it fails.
*/
int32_t nghttp2_session_get_stream_remote_window_size(nghttp2_session* session,
int32_t stream_id);
/**
* @function
*
* Signals the session so that the connection should be terminated.
*
* GOAWAY frame with the given |error_code| will be submitted if it
* has not been transmitted. After the transmission, both
* `nghttp2_session_want_read()` and `nghttp2_session_want_write()`
* return 0. If GOAWAY frame has already transmitted at the time when
* this function is invoked, `nghttp2_session_want_read()` and
* `nghttp2_session_want_write()` returns 0 immediately after this
* function succeeds.
*
* This function should be called when the connection should be
* terminated after sending GOAWAY. If the remaining streams should
* be processed after GOAWAY, use `nghttp2_submit_goaway()` instead.
*
* This function returns 0 if it succeeds, or one of the following
* negative error codes:
*
* :enum:`NGHTTP2_ERR_NOMEM`
* Out of memory.
*/
int nghttp2_session_terminate_session(nghttp2_session *session,
nghttp2_error_code error_code);
/**
* @function
*
* Returns the value of SETTINGS |id| notified by a remote endpoint.
*/
uint32_t nghttp2_session_get_remote_settings(nghttp2_session *session,
nghttp2_settings_id id);
/**
* @function
*
* Performs post-process of HTTP Upgrade request. This function can
* be called from both client and server, but the behavior is very
* different in each other.
*
* If called from client side, the |settings_payload| must be the
* value sent in ``HTTP2-Settings`` header field and must be decoded
* by base64url decoder. The |settings_payloadlen| is the length of
* |settings_payload|. The |settings_payload| is unpacked and its
* setting values will be submitted using `nghttp2_submit_settings()`.
* This means that the client application code does not need to submit
* SETTINGS by itself. The stream with stream ID=1 is opened and the
* |stream_user_data| is used for its stream_user_data. The opened
* stream becomes half-closed (local) state.
*
* If called from server side, the |settings_payload| must be the
* value received in ``HTTP2-Settings`` header field and must be
* decoded by base64url decoder. The |settings_payloadlen| is the
* length of |settings_payload|. It is treated as if the SETTINGS
* frame with that payload is received. Thus, callback functions for
* the reception of SETTINGS frame will be invoked. The stream with
* stream ID=1 is opened. The |stream_user_data| is ignored. The
* opened stream becomes half-closed (remote).
*
* This function returns 0 if it succeeds, or one of the following
* negative error codes:
*
* :enum:`NGHTTP2_ERR_NOMEM`
* Out of memory.
* :enum:`NGHTTP2_ERR_INVALID_ARGUMENT`
* The |settings_payload| is badly formed.
* :enum:`NGHTTP2_ERR_PROTO`
* The stream ID 1 is already used or closed; or is not available.
*/
int nghttp2_session_upgrade(nghttp2_session *session,
const uint8_t *settings_payload,
size_t settings_payloadlen,
void *stream_user_data);
/**
* @function
*
* Serializes the SETTINGS values |iv| in the |buf|. The size of the
* |buf| is specified by |buflen|. The number of entries in the |iv|
* array is given by |niv|. The required space in |buf| for the |niv|
* entries is ``8*niv`` bytes and if the given buffer is too small, an
* error is returned. This function is used mainly for creating a
* SETTINGS payload to be sent with the ``HTTP2-Settings`` header
* field in an HTTP Upgrade request. The data written in |buf| is NOT
* base64url encoded and the application is responsible for encoding.
*
* This function returns the number of bytes written in |buf|, or one
* of the following negative error codes:
*
* :enum:`NGHTTP2_ERR_INVALID_ARGUMENT`
* The |iv| contains duplicate settings ID or invalid value.
*
* :enum:`NGHTTP2_ERR_INSUFF_BUFSIZE`
* The provided |buflen| size is too small to hold the output.
*/
ssize_t nghttp2_pack_settings_payload(uint8_t *buf,
size_t buflen,
const nghttp2_settings_entry *iv,
size_t niv);
/**
* @function
*
* Returns string describing the |lib_error_code|. The
* |lib_error_code| must be one of the :enum:`nghttp2_error`.
*/
const char* nghttp2_strerror(int lib_error_code);
/**
* @function
*
* Initializes |pri_spec| with the |stream_id| of the stream to depend
* on with |weight| and its exclusive flag. If |exclusive| is
* nonzero, exclusive flag is set.
*
* The |weight| must be in [:enum:`NGHTTP2_MIN_WEIGHT`,
* :enum:`NGHTTP2_MAX_WEIGHT`], inclusive.
*/
void nghttp2_priority_spec_init(nghttp2_priority_spec *pri_spec,
int32_t stream_id, int32_t weight,
int exclusive);
/**
* @function
*
* Initializes |pri_spec| with the default values. The default values
* are: stream_id = 0, weight = :macro:`NGHTTP2_DEFAULT_WEIGHT` and
* exclusive = 0.
*/
void nghttp2_priority_spec_default_init(nghttp2_priority_spec *pri_spec);
/**
* @function
*
* Returns nonzero if the |pri_spec| is filled with default values.
*/
int nghttp2_priority_spec_check_default(const nghttp2_priority_spec *pri_spec);
/**
* @function
*
* Submits HEADERS frame and optionally one or more DATA frames.
*
* The |pri_spec| is priority specification of this request. ``NULL``
* means the default priority (see
* `nghttp2_priority_spec_default_init()`). To specify the priority,
* use `nghttp2_priority_spec_init()`. If |pri_spec| is not ``NULL``,
* this function will copy its data members.
*
* The `pri_spec->weight` must be in [:enum:`NGHTTP2_MIN_WEIGHT`,
* :enum:`NGHTTP2_MAX_WEIGHT`], inclusive. If `pri_spec->weight` is
* strictly less than :enum:`NGHTTP2_MIN_WEIGHT`, it becomes
* :enum:`NGHTTP2_MIN_WEIGHT`. If it is strictly greater than
* :enum:`NGHTTP2_MAX_WEIGHT`, it becomes :enum:`NGHTTP2_MAX_WEIGHT`.
*
* The |nva| is an array of name/value pair :type:`nghttp2_nv` with
* |nvlen| elements. The value is opaque sequence of bytes and
* therefore can contain NULL byte (0x0). If the application requires
* that the ordering of values for a single header field name
* appearing in different header fields, it has to concatenate them
* using NULL byte (0x0) before passing them to this function.
*
* HTTP/2 specification has requirement about header fields in the
* request HEADERS. See the specification for more details.
*
* This function creates copies of all name/value pairs in |nva|. It
* also lower-cases all names in |nva|.
*
* If |data_prd| is not ``NULL``, it provides data which will be sent
* in subsequent DATA frames. In this case, a method that allows
* request message bodies
* (http://www.w3.org/Protocols/rfc2616/rfc2616-sec9.html#sec9) must
* be specified with ``:method`` key in |nva| (e.g. ``POST``). This
* function does not take ownership of the |data_prd|. The function
* copies the members of the |data_prd|. If |data_prd| is ``NULL``,
* HEADERS have END_STREAM set. The |stream_user_data| is data
* associated to the stream opened by this request and can be an
* arbitrary pointer, which can be retrieved later by
* `nghttp2_session_get_stream_user_data()`.
*
* This function returns assigned stream ID if it succeeds, or one of
* the following negative error codes:
*
* :enum:`NGHTTP2_ERR_NOMEM`
* Out of memory.
* :enum:`NGHTTP2_ERR_STREAM_ID_NOT_AVAILABLE`
* No stream ID is available because maximum stream ID was
* reached.
*
* .. warning::
*
* This function returns assigned stream ID if it succeeds. But
* that stream is not opened yet. The application must not submit
* frame to that stream ID before
* :member:`nghttp2_session_callbacks.before_frame_send_callback` is
* called for this frame.
*
*/
int32_t nghttp2_submit_request(nghttp2_session *session,
const nghttp2_priority_spec *pri_spec,
const nghttp2_nv *nva, size_t nvlen,
const nghttp2_data_provider *data_prd,
void *stream_user_data);
/**
* @function
*
* Submits response HEADERS frame and optionally one or more DATA
* frames against the stream |stream_id|.
*
* The |nva| is an array of name/value pair :type:`nghttp2_nv` with
* |nvlen| elements. The value is opaque sequence of bytes and
* therefore can contain NULL byte (0x0). If the application requires
* that the ordering of values for a single header field name
* appearing in different header fields, it has to concatenate them
* using NULL byte (0x0) before passing them to this function.
*
* HTTP/2 specification has requirement about header fields in the
* response HEADERS. See the specification for more details.
*
* This function creates copies of all name/value pairs in |nva|. It
* also lower-cases all names in |nva|.
*
* If |data_prd| is not ``NULL``, it provides data which will be sent
* in subsequent DATA frames. This function does not take ownership
* of the |data_prd|. The function copies the members of the
* |data_prd|. If |data_prd| is ``NULL``, HEADERS will have
* END_STREAM flag set.
*
* This method can be used as normal HTTP response and push response.
* When pushing a resource using this function, the |session| must be
* configured using `nghttp2_session_server_new()` or its variants and
* the target stream denoted by the |stream_id| must be reserved using
* `nghttp2_submit_push_promise()`.
*
* This function returns 0 if it succeeds, or one of the following
* negative error codes:
*
* :enum:`NGHTTP2_ERR_NOMEM`
* Out of memory.
*/
int nghttp2_submit_response(nghttp2_session *session,
int32_t stream_id,
const nghttp2_nv *nva, size_t nvlen,
const nghttp2_data_provider *data_prd);
/**
* @function
*
* Submits HEADERS frame. The |flags| is bitwise OR of the
* following values:
*
* * :enum:`NGHTTP2_FLAG_END_STREAM`
*
* If |flags| includes :enum:`NGHTTP2_FLAG_END_STREAM`, this frame has
* END_STREAM flag set.
*
* The library handles the CONTINUATION frame internally and it
* correctly sets END_HEADERS to the last sequence of the PUSH_PROMISE
* or CONTINUATION frame.
*
* If the |stream_id| is -1, this frame is assumed as request (i.e.,
* request HEADERS frame which opens new stream). In this case, the
* assigned stream ID will be returned. Otherwise, specify stream ID
* in |stream_id|.
*
* The |pri_spec| is priority specification of this request. ``NULL``
* means the default priority (see
* `nghttp2_priority_spec_default_init()`). To specify the priority,
* use `nghttp2_priority_spec_init()`. If |pri_spec| is not ``NULL``,
* this function will copy its data members.
*
* The `pri_spec->weight` must be in [:enum:`NGHTTP2_MIN_WEIGHT`,
* :enum:`NGHTTP2_MAX_WEIGHT`], inclusive. If `pri_spec->weight` is
* strictly less than :enum:`NGHTTP2_MIN_WEIGHT`, it becomes
* :enum:`NGHTTP2_MIN_WEIGHT`. If it is strictly greater than
* :enum:`NGHTTP2_MAX_WEIGHT`, it becomes :enum:`NGHTTP2_MAX_WEIGHT`.
*
* The |nva| is an array of name/value pair :type:`nghttp2_nv` with
* |nvlen| elements. The value is opaque sequence of bytes and
* therefore can contain NULL byte (0x0). If the application requires
* that the ordering of values for a single header field name
* appearing in different header fields, it has to concatenate them
* using NULL byte (0x0) before passing them to this function.
*
* This function creates copies of all name/value pairs in |nva|. It
* also lower-cases all names in |nva|.
*
* The |stream_user_data| is a pointer to an arbitrary data which is
* associated to the stream this frame will open. Therefore it is
* only used if this frame opens streams, in other words, it changes
* stream state from idle or reserved to open.
*
* This function is low-level in a sense that the application code can
* specify flags directly. For usual HTTP request,
* `nghttp2_submit_request()` is useful.
*
* This function returns newly assigned stream ID if it succeeds and
* |stream_id| is -1. Otherwise, this function returns 0 if it
* succeeds, or one of the following negative error codes:
*
* :enum:`NGHTTP2_ERR_NOMEM`
* Out of memory.
* :enum:`NGHTTP2_ERR_STREAM_ID_NOT_AVAILABLE`
* No stream ID is available because maximum stream ID was
* reached.
*
* .. warning::
*
* This function returns assigned stream ID if it succeeds and
* |stream_id| is -1. But that stream is not opened yet. The
* application must not submit frame to that stream ID before
* :member:`nghttp2_session_callbacks.before_frame_send_callback` is
* called for this frame.
*
*/
int32_t nghttp2_submit_headers(nghttp2_session *session, uint8_t flags,
int32_t stream_id,
const nghttp2_priority_spec *pri_spec,
const nghttp2_nv *nva, size_t nvlen,
void *stream_user_data);
/**
* @function
*
* Submits one or more DATA frames to the stream |stream_id|. The
* data to be sent are provided by |data_prd|. If |flags| contains
* :enum:`NGHTTP2_FLAG_END_STREAM`, the last DATA frame has END_STREAM
* flag set. If |flags| contains :enum:`NGHTTP2_FLAG_END_SEGMENT`,
* the last DATA frame has END_SEGMENT flag set.
*
* This function does not take ownership of the |data_prd|. The
* function copies the members of the |data_prd|.
*
* This function returns 0 if it succeeds, or one of the following
* negative error codes:
*
* :enum:`NGHTTP2_ERR_NOMEM`
* Out of memory.
* :enum:`NGHTTP2_ERR_DATA_EXIST`
* DATA has been already submitted and not fully processed yet.
*/
int nghttp2_submit_data(nghttp2_session *session, uint8_t flags,
int32_t stream_id,
const nghttp2_data_provider *data_prd);
/**
* @function
*
* Submits PRIORITY frame to change the priority of stream |stream_id|
* to the priority specification |pri_spec|.
*
* The |flags| is currently ignored and should be
* :enum:`NGHTTP2_FLAG_NONE`.
*
* The |pri_spec| is priority specification of this request. ``NULL``
* is not allowed for this function. To specify the priority, use
* `nghttp2_priority_spec_init()`. This function will copy its data
* members.
*
* The `pri_spec->weight` must be in [:enum:`NGHTTP2_MIN_WEIGHT`,
* :enum:`NGHTTP2_MAX_WEIGHT`], inclusive. If `pri_spec->weight` is
* strictly less than :enum:`NGHTTP2_MIN_WEIGHT`, it becomes
* :enum:`NGHTTP2_MIN_WEIGHT`. If it is strictly greater than
* :enum:`NGHTTP2_MAX_WEIGHT`, it becomes :enum:`NGHTTP2_MAX_WEIGHT`.
*
* This function returns 0 if it succeeds, or one of the following
* negative error codes:
*
* :enum:`NGHTTP2_ERR_NOMEM`
* Out of memory.
* :enum:`NGHTTP2_ERR_INVALID_ARGUMENT`
* The |pri_spec| is NULL; or trying to depend on itself.
*/
int nghttp2_submit_priority(nghttp2_session *session, uint8_t flags,
int32_t stream_id,
const nghttp2_priority_spec *pri_spec);
/**
* @function
*
* Submits RST_STREAM frame to cancel/reject the stream |stream_id|
* with the error code |error_code|.
*
* The |flags| is currently ignored and should be
* :enum:`NGHTTP2_FLAG_NONE`.
*
* This function returns 0 if it succeeds, or one of the following
* negative error codes:
*
* :enum:`NGHTTP2_ERR_NOMEM`
* Out of memory.
*/
int nghttp2_submit_rst_stream(nghttp2_session *session, uint8_t flags,
int32_t stream_id,
nghttp2_error_code error_code);
/**
* @function
*
* Stores local settings and submits SETTINGS frame. The |iv| is the
* pointer to the array of :type:`nghttp2_settings_entry`. The |niv|
* indicates the number of :type:`nghttp2_settings_entry`.
*
* The |flags| is currently ignored and should be
* :enum:`NGHTTP2_FLAG_NONE`.
*
* This function does not take ownership of the |iv|. This function
* copies all the elements in the |iv|.
*
* While updating individual stream's local window size, if the window
* size becomes strictly larger than NGHTTP2_MAX_WINDOW_SIZE,
* RST_STREAM is issued against such a stream.
*
* SETTINGS with :enum:`NGHTTP2_FLAG_ACK` is automatically submitted
* by the library and application could not send it at its will.
*
* This function returns 0 if it succeeds, or one of the following
* negative error codes:
*
* :enum:`NGHTTP2_ERR_INVALID_ARGUMENT`
* The |iv| contains invalid value (e.g., initial window size
* strictly greater than (1 << 31) - 1.
* :enum:`NGHTTP2_ERR_TOO_MANY_INFLIGHT_SETTINGS`
* There is already another in-flight SETTINGS. Note that the
* current implementation only allows 1 in-flight SETTINGS frame
* without ACK flag set.
* :enum:`NGHTTP2_ERR_NOMEM`
* Out of memory.
*/
int nghttp2_submit_settings(nghttp2_session *session, uint8_t flags,
const nghttp2_settings_entry *iv, size_t niv);
/**
* @function
*
* Submits PUSH_PROMISE frame.
*
* The |flags| is currently ignored. The library handles the
* CONTINUATION frame internally and it correctly sets END_HEADERS to
* the last sequence of the PUSH_PROMISE or CONTINUATION frame.
*
* The |stream_id| must be client initiated stream ID.
*
* The |nva| is an array of name/value pair :type:`nghttp2_nv` with
* |nvlen| elements. The value is opaque sequence of bytes and
* therefore can contain NULL byte (0x0). If the application requires
* that the ordering of values for a single header field name
* appearing in different header fields, it has to concatenate them
* using NULL byte (0x0) before passing them to this function.
*
* This function creates copies of all name/value pairs in |nva|. It
* also lower-cases all names in |nva|.
*
* The |promised_stream_user_data| is a pointer to an arbitrary data
* which is associated to the promised stream this frame will open and
* make it in reserved state. It is available using
* `nghttp2_session_get_stream_user_data()`. The application can
* access it in :type:`nghttp2_before_frame_send_callback` and
* :type:`nghttp2_on_frame_send_callback` of this frame.
*
* The client side is not allowed to use this function.
*
* This function returns assigned promised stream ID if it succeeds,
* or one of the following negative error codes:
*
* :enum:`NGHTTP2_ERR_NOMEM`
* Out of memory.
* :enum:`NGHTTP2_ERR_PROTO`
* This function was invoked when |session| is initialized as
* client.
* :enum:`NGHTTP2_ERR_STREAM_ID_NOT_AVAILABLE`
* No stream ID is available because maximum stream ID was
* reached.
*
* .. warning::
*
* This function returns assigned promised stream ID if it succeeds.
* But that stream is not opened yet. The application must not
* submit frame to that stream ID before
* :member:`nghttp2_session_callbacks.before_frame_send_callback` is
* called for this frame.
*
*/
int32_t nghttp2_submit_push_promise(nghttp2_session *session, uint8_t flags,
int32_t stream_id,
const nghttp2_nv *nva, size_t nvlen,
void *promised_stream_user_data);
/**
* @function
*
* Submits PING frame. You don't have to send PING back when you
* received PING frame. The library automatically submits PING frame
* in this case.
*
* The |flags| is currently ignored and should be
* :enum:`NGHTTP2_FLAG_NONE`.
*
* If the |opaque_data| is non ``NULL``, then it should point to the 8
* bytes array of memory to specify opaque data to send with PING
* frame. If the |opaque_data| is ``NULL``, zero-cleared 8 bytes will
* be sent as opaque data.
*
* This function returns 0 if it succeeds, or one of the following
* negative error codes:
*
* :enum:`NGHTTP2_ERR_NOMEM`
* Out of memory.
*/
int nghttp2_submit_ping(nghttp2_session *session, uint8_t flags,
uint8_t *opaque_data);
/**
* @function
*
* Submits GOAWAY frame with the error code |error_code|.
*
* The |flags| is currently ignored and should be
* :enum:`NGHTTP2_FLAG_NONE`.
*
* If the |opaque_data| is not ``NULL`` and |opaque_data_len| is not
* zero, those data will be sent as additional debug data. The
* library makes a copy of the memory region pointed by |opaque_data|
* with the length |opaque_data_len|, so the caller does not need to
* keep this memory after the return of this function. If the
* |opaque_data_len| is 0, the |opaque_data| could be ``NULL``.
*
* This function returns 0 if it succeeds, or one of the following
* negative error codes:
*
* :enum:`NGHTTP2_ERR_NOMEM`
* Out of memory.
* NGHTTP2_ERR_INVALID_ARGUMENT
* The |opaque_data_len| is too large.
*/
int nghttp2_submit_goaway(nghttp2_session *session, uint8_t flags,
nghttp2_error_code error_code,
const uint8_t *opaque_data, size_t opaque_data_len);
/**
* @function
*
* Submits WINDOW_UPDATE frame.
*
* The |flags| is currently ignored and should be
* :enum:`NGHTTP2_FLAG_NONE`.
*
* If the |window_size_increment| is positive, the WINDOW_UPDATE with
* that value as window_size_increment is queued. If the
* |window_size_increment| is larger than the received bytes from the
* remote endpoint, the local window size is increased by that
* difference.
*
* If the |window_size_increment| is negative, the local window size
* is decreased by -|window_size_increment|. If
* :enum:`NGHTTP2_OPT_NO_AUTO_STREAM_WINDOW_UPDATE` (or
* :enum:`NGHTTP2_OPT_NO_AUTO_CONNECTION_WINDOW_UPDATE` if |stream_id|
* is 0) is not set and the library decided that the WINDOW_UPDATE
* should be submitted, then WINDOW_UPDATE is queued with the current
* received bytes count.
*
* If the |window_size_increment| is 0, the function does nothing and
* returns 0.
*
* This function returns 0 if it succeeds, or one of the following
* negative error codes:
*
* :enum:`NGHTTP2_ERR_FLOW_CONTROL`
* The local window size overflow or gets negative.
* :enum:`NGHTTP2_ERR_NOMEM`
* Out of memory.
*/
int nghttp2_submit_window_update(nghttp2_session *session, uint8_t flags,
int32_t stream_id,
int32_t window_size_increment);
/**
* @function
*
* Submits ALTSVC frame with given parameters.
*
* The |flags| is currently ignored and should be
* :enum:`NGHTTP2_FLAG_NONE`.
*
* Only the server can send the ALTSVC frame. If |session| is
* initialized as client, this function fails and returns
* :enum:`NGHTTP2_ERR_INVALID_STATE`.
*
* If the |protocol_id_len| is 0, the |protocol_id| could be ``NULL``.
*
* If the |host_len| is 0, the |host| could be ``NULL``.
*
* If the |origin_len| is 0, the |origin| could be ``NULL``.
*
* This function returns 0 if it succeeds, or one of the following
* negative error codes:
*
* :enum:`NGHTTP2_ERR_NOMEM`
* Out of memory.
* :enum:`NGHTTP2_ERR_PROTO`
* The function is invoked with |session| which was initialized as
* client.
* :enum:`NGHTTP2_ERR_INVALID_ARGUMENT`
* The combined length of |protocol_id_len|, |host_len| and
* |origin_len| is is too large.
*/
int nghttp2_submit_altsvc(nghttp2_session *session, uint8_t flags,
int32_t stream_id,
uint32_t max_age, uint16_t port,
const uint8_t *protocol_id, size_t protocol_id_len,
const uint8_t *host, size_t host_len,
const uint8_t *origin, size_t origin_len);
/**
* @function
*
* Compares ``lhs->name`` of length ``lhs->namelen`` bytes and
* ``rhs->name`` of length ``rhs->namelen`` bytes. Returns negative
* integer if ``lhs->name`` is found to be less than ``rhs->name``; or
* returns positive integer if ``lhs->name`` is found to be greater
* than ``rhs->name``; or returns 0 otherwise.
*/
int nghttp2_nv_compare_name(const nghttp2_nv *lhs, const nghttp2_nv *rhs);
/**
* @function
*
* A helper function for dealing with NPN in client side or ALPN in
* server side. The |in| contains peer's protocol list in preferable
* order. The format of |in| is length-prefixed and not
* null-terminated. For example, ``HTTP-draft-04/2.0`` and
* ``http/1.1`` stored in |in| like this::
*
* in[0] = 17
* in[1..17] = "HTTP-draft-04/2.0"
* in[18] = 8
* in[19..26] = "http/1.1"
* inlen = 27
*
* The selection algorithm is as follows:
*
* 1. If peer's list contains HTTP/2 protocol the library supports,
* it is selected and returns 1. The following step is not taken.
*
* 2. If peer's list contains ``http/1.1``, this function selects
* ``http/1.1`` and returns 0. The following step is not taken.
*
* 3. This function selects nothing and returns -1 (So called
* non-overlap case). In this case, |out| and |outlen| are left
* untouched.
*
* Selecting ``HTTP-draft-04/2.0`` means that ``HTTP-draft-04/2.0`` is
* written into |*out| and its length (which is 17) is assigned to
* |*outlen|.
*
* For ALPN, refer to
* https://tools.ietf.org/html/draft-ietf-tls-applayerprotoneg-05
*
* See http://technotes.googlecode.com/git/nextprotoneg.html for more
* details about NPN.
*
* For NPN, to use this method you should do something like::
*
* static int select_next_proto_cb(SSL* ssl,
* unsigned char **out,
* unsigned char *outlen,
* const unsigned char *in,
* unsigned int inlen,
* void *arg)
* {
* int rv;
* rv = nghttp2_select_next_protocol(out, outlen, in, inlen);
* if(rv == 1) {
* ((MyType*)arg)->http2_selected = 1;
* }
* return SSL_TLSEXT_ERR_OK;
* }
* ...
* SSL_CTX_set_next_proto_select_cb(ssl_ctx, select_next_proto_cb, my_obj);
*
*/
int nghttp2_select_next_protocol(unsigned char **out, unsigned char *outlen,
const unsigned char *in, unsigned int inlen);
/**
* @function
*
* Returns a pointer to a nghttp2_info struct with version information
* about the run-time library in use. The |least_version| argument
* can be set to a 24 bit numerical value for the least accepted
* version number and if the condition is not met, this function will
* return a ``NULL``. Pass in 0 to skip the version checking.
*/
nghttp2_info *nghttp2_version(int least_version);
/**
* @function
*
* Returns nonzero if the :type:`nghttp2_error` library error code
* |lib_error| is fatal.
*/
int nghttp2_is_fatal(int lib_error);
/**
* @function
*
* Returns nonzero if HTTP header field name |name| of length |len| is
* valid according to
* http://tools.ietf.org/html/draft-ietf-httpbis-p1-messaging-25#section-3.2
*
* Because this is a header field name in HTTP2, the upper cased alphabet
* is treated as error.
*/
int nghttp2_check_header_name(const uint8_t *name, size_t len);
/**
* @function
*
* Returns nonzero if HTTP header field value |value| of length |len|
* is valid according to
* http://tools.ietf.org/html/draft-ietf-httpbis-p1-messaging-25#section-3.2
*
* Because this is HTTP2 header field value, it can contain NULL
* character (0x00).
*/
int nghttp2_check_header_value(const uint8_t *value, size_t len);
/* HPACK API */
struct nghttp2_hd_deflater;
/**
* @struct
*
* HPACK deflater object.
*/
typedef struct nghttp2_hd_deflater nghttp2_hd_deflater;
/**
* @function
*
* Initializes |*deflater_ptr| for deflating name/values pairs.
*
* The |deflate_hd_table_bufsize_max| is the upper bound of header
* table size the deflater will use.
*
* This function returns 0 if it succeeds, or one of the following
* negative error codes:
*
* :enum:`NGHTTP2_ERR_NOMEM`
* Out of memory.
*/
int nghttp2_hd_deflate_new(nghttp2_hd_deflater **deflater_ptr,
size_t deflate_hd_table_bufsize_max);
/**
* @function
*
* Deallocates any resources allocated for |deflater|.
*/
void nghttp2_hd_deflate_del(nghttp2_hd_deflater *deflater);
/**
* @function
*
* Sets the availability of reference set in the |deflater|. If
* |no_refset| is nonzero, the deflater will first emit "Reference Set
* Emptying" in the each subsequent invocation of
* `nghttp2_hd_deflate_hd()` to clear up reference set. By default,
* the deflater uses reference set.
*/
void nghttp2_hd_deflate_set_no_refset(nghttp2_hd_deflater *deflater,
uint8_t no_refset);
/**
* @function
*
* Changes header table size of the |deflater| to
* |settings_hd_table_bufsize_max| bytes. This may trigger eviction
* in the dynamic table.
*
* The |settings_hd_table_bufsize_max| should be the value received in
* SETTINGS_HEADER_TABLE_SIZE.
*
* The deflater never uses more memory than
* ``deflate_hd_table_bufsize_max`` bytes specified in
* `nghttp2_hd_deflate_new()`. Therefore, if
* |settings_hd_table_bufsize_max| > ``deflate_hd_table_bufsize_max``,
* resulting maximum table size becomes
* ``deflate_hd_table_bufsize_max``.
*
* This function returns 0 if it succeeds, or one of the following
* negative error codes:
*
* :enum:`NGHTTP2_ERR_NOMEM`
* Out of memory.
*/
int nghttp2_hd_deflate_change_table_size(nghttp2_hd_deflater *deflater,
size_t settings_hd_table_bufsize_max);
/**
* @function
*
* Deflates the |nva|, which has the |nvlen| name/value pairs, into
* the |buf| of length |buflen|.
*
* If |buf| is not large enough to store the deflated header block,
* this function fails with :enum:`NGHTTP2_ERR_INSUFF_BUFSIZE`. The
* caller should use `nghttp2_hd_deflate_bound()` to know the upper
* bound of buffer size required to deflate given header name/value
* pairs.
*
* Once this function fails, subsequent call of this function always
* returns :enum:`NGHTTP2_ERR_HEADER_COMP`.
*
* After this function returns, it is safe to delete the |nva|.
*
* This function returns 0 if it succeeds, or one of the following
* negative error codes:
*
* :enum:`NGHTTP2_ERR_NOMEM`
* Out of memory.
* :enum:`NGHTTP2_ERR_HEADER_COMP`
* Deflation process has failed.
* :enum:`NGHTTP2_ERR_INSUFF_BUFSIZE`
* The provided |buflen| size is too small to hold the output.
*/
ssize_t nghttp2_hd_deflate_hd(nghttp2_hd_deflater *deflater,
uint8_t *buf, size_t buflen,
nghttp2_nv *nva, size_t nvlen);
/**
* @function
*
* Returns an upper bound on the compressed size after deflation of
* |nva| of length |nvlen|.
*/
size_t nghttp2_hd_deflate_bound(nghttp2_hd_deflater *deflater,
const nghttp2_nv *nva, size_t nvlen);
struct nghttp2_hd_inflater;
/**
* @struct
*
* HPACK inflater object.
*/
typedef struct nghttp2_hd_inflater nghttp2_hd_inflater;
/**
* @function
*
* Initializes |*inflater_ptr| for inflating name/values pairs.
*
* This function returns 0 if it succeeds, or one of the following
* negative error codes:
*
* :enum:`NGHTTP2_ERR_NOMEM`
* Out of memory.
*/
int nghttp2_hd_inflate_new(nghttp2_hd_inflater **inflater_ptr);
/**
* @function
*
* Deallocates any resources allocated for |inflater|.
*/
void nghttp2_hd_inflate_del(nghttp2_hd_inflater *inflater);
/**
* @function
*
* Changes header table size in the |inflater|. This may trigger
* eviction in the dynamic table.
*
* The |settings_hd_table_bufsize_max| should be the value transmitted
* in SETTINGS_HEADER_TABLE_SIZE.
*
* This function returns 0 if it succeeds, or one of the following
* negative error codes:
*
* :enum:`NGHTTP2_ERR_NOMEM`
* Out of memory.
*/
int nghttp2_hd_inflate_change_table_size(nghttp2_hd_inflater *inflater,
size_t settings_hd_table_bufsize_max);
/**
* @enum
*
* The flags for header inflation.
*/
typedef enum {
/**
* No flag set.
*/
NGHTTP2_HD_INFLATE_NONE = 0,
/**
* Indicates all headers were inflated.
*/
NGHTTP2_HD_INFLATE_FINAL = 0x01,
/**
* Indicates a header was emitted.
*/
NGHTTP2_HD_INFLATE_EMIT = 0x02
} nghttp2_hd_inflate_flag;
/**
* @function
*
* Inflates name/value block stored in |in| with length |inlen|. This
* function performs decompression. For each successful emission of
* header name/value pair, :enum:`NGHTTP2_HD_INFLATE_EMIT` is set in
* |*inflate_flags| and name/value pair is assigned to the |nv_out|
* and the function returns. The caller must not free the members of
* |nv_out|.
*
* The |nv_out| may include pointers to the memory region in the |in|.
* The caller must retain the |in| while the |nv_out| is used.
*
* The application should call this function repeatedly until the
* ``(*inflate_flags) & NGHTTP2_HD_INFLATE_FINAL`` is nonzero and
* return value is non-negative. This means the all input values are
* processed successfully. Then the application must call
* `nghttp2_hd_inflate_end_headers()` to prepare for the next header
* block input.
*
* The caller can feed complete compressed header block. It also can
* feed it in several chunks. The caller must set |in_final| to
* nonzero if the given input is the last block of the compressed
* header.
*
* This function returns the number of bytes processed if it succeeds,
* or one of the following negative error codes:
*
* :enum:`NGHTTP2_ERR_NOMEM`
* Out of memory.
* :enum:`NGHTTP2_ERR_HEADER_COMP`
* Inflation process has failed.
* :enum:`NGHTTP2_ERR_BUFFER_ERROR`
* The heder field name or value is too large.
*
* Example follows::
*
* int inflate_header_block(nghttp2_hd_inflater *hd_inflater,
* uint8_t *in, size_t inlen, int final)
* {
* int rv;
*
* for(;;) {
* nghttp2_nv nv;
* int inflate_flags = 0;
*
* rv = nghttp2_hd_inflate_hd(hd_inflater, &nv, &inflate_flags,
* in, inlen, final);
*
* if(rv < 0) {
* fprintf(stderr, "inflate failed with error code %d", rv);
* return -1;
* }
*
* in += rv;
* inlen -= rv;
*
* if(inflate_flags & NGHTTP2_HD_INFLATE_EMIT) {
* fwrite(nv.name, nv.namelen, 1, stderr);
* fprintf(stderr, ": ");
* fwrite(nv.value, nv.valuelen, 1, stderr);
* fprintf(stderr, "\n");
* }
* if(inflate_flags & NGHTTP2_HD_INFLATE_FINAL) {
* nghttp2_hd_inflate_end_headers(hd_inflater);
* break;
* }
* if((inflate_flags & NGHTTP2_HD_INFLATE_EMIT) == 0 &&
* inlen == 0) {
* break;
* }
* }
*
* return 0;
* }
*
*/
ssize_t nghttp2_hd_inflate_hd(nghttp2_hd_inflater *inflater,
nghttp2_nv *nv_out, int *inflate_flags,
uint8_t *in, size_t inlen, int in_final);
/**
* @function
*
* Signals the end of decompression for one header block.
*
* This function returns 0 if it succeeds. Currently this function
* always succeeds.
*/
int nghttp2_hd_inflate_end_headers(nghttp2_hd_inflater *inflater);
#ifdef __cplusplus
}
#endif
#endif /* NGHTTP2_H */
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