nghttp2/lib/includes/spdylay/spdylay.h

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/*
* Spdylay - SPDY Library
*
* Copyright (c) 2012 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 SPDYLAY_H
#define SPDYLAY_H
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#ifdef __cplusplus
extern "C" {
#endif
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#include <stdlib.h>
#include <stdint.h>
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#include <sys/types.h>
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struct spdylay_session;
typedef struct spdylay_session spdylay_session;
/* SPDY protocol version 2 */
#define SPDYLAY_PROTO_VERSION 2
typedef enum {
SPDYLAY_ERR_INVALID_ARGUMENT = -501,
SPDYLAY_ERR_ZLIB = -502,
SPDYLAY_ERR_ZLIB_BUF = -503,
SPDYLAY_ERR_WOULDBLOCK = -504,
SPDYLAY_ERR_PROTO = -505,
SPDYLAY_ERR_INVALID_FRAME = -506,
SPDYLAY_ERR_EOF = -507,
/* The errors < SPDYLAY_ERR_FATAL mean that the library is under
unexpected condition that it cannot process any further data
reliably (e.g., out of memory). */
SPDYLAY_ERR_FATAL = -900,
SPDYLAY_ERR_NOMEM = -901,
SPDYLAY_ERR_CALLBACK_FAILURE = -902,
} spdylay_error;
typedef enum {
SPDYLAY_MSG_MORE
} spdylay_io_flag;
typedef enum {
SPDYLAY_SYN_STREAM = 1,
SPDYLAY_SYN_REPLY = 2,
SPDYLAY_RST_STREAM = 3,
SPDYLAY_SETTINGS = 4,
SPDYLAY_NOOP = 5,
SPDYLAY_PING = 6,
SPDYLAY_GOAWAY = 7,
SPDYLAY_HEADERS = 8,
SPDYLAY_DATA = 100,
} spdylay_frame_type;
typedef enum {
SPDYLAY_FLAG_NONE = 0,
SPDYLAY_FLAG_FIN = 1,
SPDYLAY_FLAG_UNIDIRECTIONAL = 2
} spdylay_flag;
typedef enum {
SPDYLAY_FLAG_SETTINGS_NONE = 0,
SPDYLAY_FLAG_SETTINGS_CLEAR_PREVIOUSLY_PERSISTED_SETTINGS = 1
} spdylay_settings_flag;
typedef enum {
SPDYLAY_ID_FLAG_SETTINGS_NONE = 0,
SPDYLAY_ID_FLAG_SETTINGS_PERSIST_VALUE = 1,
SPDYLAY_ID_FLAG_SETTINGS_PERSISTED = 2
} spdylay_settings_id_flag;
typedef enum {
SPDYLAY_SETTINGS_UPLOAD_BANDWIDTH = 1,
SPDYLAY_SETTINGS_DOWNLOAD_BANDWIDTH = 2,
SPDYLAY_SETTINGS_ROUND_TRIP_TIME = 3,
SPDYLAY_SETTINGS_MAX_CONCURRENT_STREAMS = 4,
SPDYLAY_SETTINGS_CURRENT_CWND = 5,
SPDYLAY_SETTINGS_DOWNLOAD_RETRANS_RATE = 6,
SPDYLAY_SETTINGS_INITIAL_WINDOW_SIZE = 7
} spdylay_settings_id;
typedef enum {
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SPDYLAY_OK = 0,
SPDYLAY_PROTOCOL_ERROR = 1,
SPDYLAY_INVALID_STREAM = 2,
SPDYLAY_REFUSED_STREAM = 3,
SPDYLAY_UNSUPPORTED_VERSION = 4,
SPDYLAY_CANCEL = 5,
SPDYLAY_INTERNAL_ERROR = 6,
SPDYLAY_FLOW_CONTROL_ERROR = 7
} spdylay_status_code;
typedef struct {
uint16_t version;
uint16_t type;
uint8_t flags;
int32_t length;
} spdylay_ctrl_hd;
typedef struct {
spdylay_ctrl_hd hd;
int32_t stream_id;
int32_t assoc_stream_id;
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/* 0 (Highest) to 3 (Lowest). Looks like spdy/2 spec is wrong. */
uint8_t pri;
char **nv;
} spdylay_syn_stream;
typedef struct {
spdylay_ctrl_hd hd;
int32_t stream_id;
char **nv;
} spdylay_syn_reply;
typedef struct {
spdylay_ctrl_hd hd;
int32_t stream_id;
char **nv;
} spdylay_headers;
typedef struct {
spdylay_ctrl_hd hd;
int32_t stream_id;
uint32_t status_code;
} spdylay_rst_stream;
typedef struct {
int32_t settings_id;
uint8_t flags;
uint32_t value;
} spdylay_settings_entry;
typedef struct {
spdylay_ctrl_hd hd;
/* Number of entries in |iv| */
size_t niv;
spdylay_settings_entry *iv;
} spdylay_settings;
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typedef struct {
spdylay_ctrl_hd hd;
uint32_t unique_id;
} spdylay_ping;
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typedef struct {
spdylay_ctrl_hd hd;
int32_t last_good_stream_id;
uint32_t status_code;
} spdylay_goaway;
typedef union {
int fd;
void *ptr;
} spdylay_data_source;
typedef ssize_t (*spdylay_data_source_read_callback)
(spdylay_session *session, uint8_t *buf, size_t length, int *eof,
spdylay_data_source *source, void *user_data);
typedef struct {
spdylay_data_source source;
spdylay_data_source_read_callback read_callback;
} spdylay_data_provider;
typedef struct {
int32_t stream_id;
uint8_t flags;
spdylay_data_provider data_prd;
} spdylay_data;
typedef union {
spdylay_syn_stream syn_stream;
spdylay_syn_reply syn_reply;
spdylay_rst_stream rst_stream;
spdylay_settings settings;
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spdylay_ping ping;
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spdylay_goaway goaway;
spdylay_headers headers;
spdylay_data data;
} spdylay_frame;
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/*
* Callback function invoked when |session| want to send data to
* remote peer. The implementation of this function must send at most
* |length| bytes of data stored in |data|. It must return the number
* of bytes sent if it succeeds. If it cannot send any single byte
* without blocking, it must return SPDYLAY_ERR_WOULDBLOCK. For other
* errors, it must return SPDYLAY_ERR_CALLBACK_FAILURE.
*/
typedef ssize_t (*spdylay_send_callback)
(spdylay_session *session,
const uint8_t *data, size_t length, int flags, void *user_data);
/*
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* Callback function invoked when |session| want to receive data from
* remote peer. The implementation of this function must read at most
* |length| bytes of data and store it in |buf|. It must return the
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* number of bytes written in |buf| if it succeeds. If it cannot read
* any single byte without blocking, it must return
* SPDYLAY_ERR_WOULDBLOCK. If it gets EOF before it reads any single
* byte, it must return SPDYLAY_ERR_EOF. For other errors, it must
* return SPDYLAY_ERR_CALLBACK_FAILURE.
*/
typedef ssize_t (*spdylay_recv_callback)
(spdylay_session *session,
uint8_t *buf, size_t length, int flags, void *user_data);
/*
* Callback function invoked by spdylay_session_recv() when a control
* frame is arrived.
*/
typedef void (*spdylay_on_ctrl_recv_callback)
(spdylay_session *session, spdylay_frame_type type, spdylay_frame *frame,
void *user_data);
/*
* Callback function invoked by spdylay_session_recv() when an invalid
* control frame is arrived, which typically the case where RST_STREAM
* will be sent
*/
typedef void (*spdylay_on_invalid_ctrl_recv_callback)
(spdylay_session *session, spdylay_frame_type type, spdylay_frame *frame,
void *user_data);
/*
* Callback function invoked when data chunk of DATA frame is
* received. |stream_id| is the stream ID of this DATA frame belongs
* to. |flags| is the flags of DATA frame which this data chunk is
* contained. flags & SPDYLAY_FLAG_FIN does not necessarily mean this
* chunk of data is the last one in the stream. You should use
* spdylay_on_data_recv_callback to know all data frame is received
* whose flags contains SPDYLAY_FLAG_FIN.
*/
typedef void (*spdylay_on_data_chunk_recv_callback)
(spdylay_session *session, uint8_t flags, int32_t stream_id,
const uint8_t *data, size_t len, void *user_data);
/*
* Callback function invoked when DATA frame is received. The actual
* data it contains are received by spdylay_on_data_recv_callback.
*/
typedef void (*spdylay_on_data_recv_callback)
(spdylay_session *session, uint8_t flags, int32_t stream_id, int32_t length,
void *user_data);
/*
* Callback function invoked after frame |frame| of type |type| is
* sent.
*/
typedef void (*spdylay_on_ctrl_send_callback)
(spdylay_session *session, spdylay_frame_type type, spdylay_frame *frame,
void *user_data);
/*
* Callback function invoked after DATA frame is sent.
*/
typedef void (*spdylay_on_data_send_callback)
(spdylay_session *session, uint8_t flags, int32_t stream_id, int32_t length,
void *user_data);
/*
* Callback function invoked before frame |frame| of type |type| is
* sent. This may be useful, for example, to know the stream ID of
* SYN_STREAM frame, which is not assigned when it was queued.
*/
typedef void (*spdylay_before_ctrl_send_callback)
(spdylay_session *session, spdylay_frame_type type, spdylay_frame *frame,
void *user_data);
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/*
* Callback function invoked when stream |stream_id| is closed. The
* reason of closure is indicated by |status_code|.
*/
typedef void (*spdylay_on_stream_close_callback)
(spdylay_session *session, int32_t stream_id, spdylay_status_code status_code,
void *user_data);
typedef struct {
spdylay_send_callback send_callback;
spdylay_recv_callback recv_callback;
spdylay_on_ctrl_recv_callback on_ctrl_recv_callback;
spdylay_on_invalid_ctrl_recv_callback on_invalid_ctrl_recv_callback;
spdylay_on_data_chunk_recv_callback on_data_chunk_recv_callback;
spdylay_on_data_recv_callback on_data_recv_callback;
spdylay_before_ctrl_send_callback before_ctrl_send_callback;
spdylay_on_ctrl_send_callback on_ctrl_send_callback;
spdylay_on_data_send_callback on_data_send_callback;
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spdylay_on_stream_close_callback on_stream_close_callback;
} spdylay_session_callbacks;
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/*
* Initializes |*session_ptr| for client use. This function returns 0
* if it succeeds, or negative error code.
*/
int spdylay_session_client_new(spdylay_session **session_ptr,
const spdylay_session_callbacks *callbacks,
void *user_data);
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/*
* Frees any resources allocated for |session|.
*/
void spdylay_session_del(spdylay_session *session);
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/*
* Sends pending frames to the remote peer. This function returns 0 if
* it succeeds, or negative error code.
*/
int spdylay_session_send(spdylay_session *session);
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/*
* Receives frames from the remote peer. This function returns 0 if it
* succeeds, or negative error code.
*/
int spdylay_session_recv(spdylay_session *session);
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/*
* Returns non-zero value if |session| want to receive data from the
* remote peer, or 0.
*/
int spdylay_session_want_read(spdylay_session *session);
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/*
* Returns non-zero value if |session| want to send data to the remote
* peer, or 0.
*/
int spdylay_session_want_write(spdylay_session *session);
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/*
* Submits SYN_STREAM frame. |pri| is priority of this request and it
* must be in the range of [0, 3]. 0 means the higest priority. |nv|
* must include following name/value pairs:
*
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* "method": HTTP method (e.g., "GET" or "POST")
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* "scheme": URI scheme (e.g., "https")
* "url": Abosolute path of this request (e.g., "/foo")
* "version": HTTP version (e.g., "HTTP/1.1")
*
* This function creates copies of all name/value pairs in |nv|.
*
* If |data_prd| is not NULL, it provides data which will be sent in
* subsequent DATA frames. In this case, "POST" must be specified with
* "method" key in |nv|. If |data_prd| is NULL, SYN_STREAM have
* FLAG_FIN.
*
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* This function returns 0 if it succeeds, or negative error code.
*/
int spdylay_submit_request(spdylay_session *session, uint8_t pri,
const char **nv,
spdylay_data_provider *data_prd);
/*
* Submits DATA frame to stream |stream_id|.
*
* This function returns 0 if it succeeds, or negative error code.
*/
int spdylay_submit_data(spdylay_session *session, int32_t stream_id,
spdylay_data_provider *data_prd);
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/*
* Submits SYN_REPLY frame against stream |stream_id|. |nv| must
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* include following name/value pairs:
*
* "status": HTTP status code (e.g., "200" or "200 OK")
* "version": HTTP response version (e.g., "HTTP/1.1")
*
* This function creates copies of all name/value pairs in |nv|. If
* |data_prd| is not NULL, it provides data which will be sent in
* subsequent DATA frames. If |data_prd| is NULL, SYN_REPLY will have
* FLAG_FIN.
*
* This function returns 0 if it succeeds, or negative error code.
*/
int spdylay_submit_response(spdylay_session *session,
int32_t stream_id, const char **nv,
spdylay_data_provider *data_prd);
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/*
* Submits PING frame. This function returns 0 if it succeeds, or
* negative error code.
*/
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int spdylay_submit_ping(spdylay_session *session);
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/*
* Submits GOAWAY frame. This function returns 0 if it succeeds, or
* negative error code.
*/
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int spdylay_submit_goaway(spdylay_session *session);
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#ifdef __cplusplus
}
#endif
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#endif /* SPDYLAY_H */