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nghttp2/lib/spdylay_session.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_SESSION_H
#define SPDYLAY_SESSION_H
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif /* HAVE_CONFIG_H */
#include <spdylay/spdylay.h>
#include "spdylay_pq.h"
#include "spdylay_map.h"
#include "spdylay_frame.h"
#include "spdylay_zlib.h"
#include "spdylay_stream.h"
#include "spdylay_buffer.h"
#include "spdylay_outbound_item.h"
typedef struct {
spdylay_outbound_item *item;
/* Buffer for outbound frames. Used to pack one frame. The memory
pointed by framebuf is initially allocated by
spdylay_session_{client,server}_new() and deallocated by
spdylay_session_del() */
uint8_t *framebuf;
/* The capacity of framebuf in bytes */
size_t framebufmax;
/* The length of the frame stored in framebuf */
size_t framebuflen;
/* The number of bytes has been sent */
size_t framebufoff;
} spdylay_active_outbound_item;
/* Buffer length for inbound raw byte stream. */
#define SPDYLAY_INBOUND_BUFFER_LENGTH 16384
#define SPDYLAY_INITIAL_OUTBOUND_FRAMEBUF_LENGTH (SPDYLAY_DATA_PAYLOAD_LENGTH+8)
#define SPDYLAY_INITIAL_INBOUND_FRAMEBUF_LENGTH \
SPDYLAY_INITIAL_OUTBOUND_FRAMEBUF_LENGTH
#define SPDYLAY_INITIAL_NV_BUFFER_LENGTH 4096
#define SPDYLAY_INITIAL_WINDOW_SIZE 65536
typedef enum {
SPDYLAY_RECV_HEAD,
SPDYLAY_RECV_PAYLOAD
} spdylay_inbound_state;
#define SPDYLAY_HEAD_LEN 8
/* Maximum unique ID in use for PING. If unique ID exeeds this number,
it wraps to 1 (client) or 2 (server) */
#define SPDYLAY_MAX_UNIQUE_ID ((1u << 31)-1)
typedef struct {
spdylay_inbound_state state;
uint8_t headbuf[SPDYLAY_HEAD_LEN];
/* How many bytes are filled in headbuf */
size_t headbufoff;
/* Payload for control frames. It is not used for DATA frames */
uint8_t *buf;
/* Capacity of buf */
size_t bufmax;
/* length in Length field */
size_t len;
/* How many bytes are filled in buf */
size_t off;
} spdylay_inbound_frame;
typedef enum {
SPDYLAY_GOAWAY_NONE = 0,
/* Flag means GOAWAY frame is sent to the remote peer. */
SPDYLAY_GOAWAY_SEND = 0x1,
/* Flag means GOAWAY frame is received from the remote peer. */
SPDYLAY_GOAWAY_RECV = 0x2,
/* Flag means connection should be dropped after sending GOAWAY. */
SPDYLAY_GOAWAY_FAIL_ON_SEND = 0x4
} spdylay_goaway_flag;
struct spdylay_session {
/* The protocol version: either SPDYLAY_PROTO_SPDY2 or
SPDYLAY_PROTO_SPDY3 */
uint16_t version;
uint8_t server;
/* Next Stream ID. Made unsigned int to detect >= (1 << 31). */
uint32_t next_stream_id;
int32_t last_recv_stream_id;
/* Counter of unique ID of PING. Wraps when it exceeds
SPDYLAY_MAX_UNIQUE_ID */
uint32_t next_unique_id;
/* Sequence number of outbound frame to maintain the order of
enqueue if priority is equal. */
int64_t next_seq;
spdylay_map /* <spdylay_stream*> */ streams;
/* Queue for outbound frames other than SYN_STREAM */
spdylay_pq /* <spdylay_outbound_item*> */ ob_pq;
/* Queue for outbound SYN_STREAM frame */
spdylay_pq /* <spdylay_outbound_item*> */ ob_ss_pq;
spdylay_active_outbound_item aob;
spdylay_inbound_frame iframe;
/* Buffer used to store inflated name/value pairs in wire format
temporarily on pack/unpack. */
uint8_t *nvbuf;
/* The number of bytes allocated for nvbuf */
size_t nvbuflen;
/* Buffer used to store name/value pairs while inflating them using
zlib on unpack */
spdylay_buffer inflatebuf;
spdylay_zlib hd_deflater;
spdylay_zlib hd_inflater;
/* The last unique ID sent to the peer. */
uint32_t last_ping_unique_id;
/* Flags indicating GOAWAY is sent and/or recieved. The flags are
composed by bitwise OR-ing spdylay_goaway_flag. */
uint8_t goaway_flags;
/* This is the value in GOAWAY frame sent by remote endpoint. */
int32_t last_good_stream_id;
/* Flag to indicate whether this session enforces flow
control. Nonzero for flow control enabled. */
uint8_t flow_control;
/* Settings value received from the remote endpoint. We just use ID
as index. The index = 0 is unused. */
uint32_t remote_settings[SPDYLAY_SETTINGS_MAX+1];
/* Settings value of the local endpoint. */
uint32_t local_settings[SPDYLAY_SETTINGS_MAX+1];
spdylay_session_callbacks callbacks;
void *user_data;
};
/* TODO stream timeout etc */
/*
* Returns nonzero value if |stream_id| is initiated by local
* endpoint.
*/
int spdylay_session_is_my_stream_id(spdylay_session *session,
int32_t stream_id);
/*
* Adds frame |frame| of type |frame_type| to the outbound queue in
* |session|. |aux_data| is a pointer to the arbitrary data. Its
* interpretation is defined per |frame_type|. When this function
* succeeds, it takes ownership of |frame| and |aux_data|, so caller
* must not free them on success.
*
* This function returns 0 if it succeeds, or one of the following
* negative error codes:
*
* SPDYLAY_ERR_NOMEM
* Out of memory.
*/
int spdylay_session_add_frame(spdylay_session *session,
spdylay_frame_type frame_type,
spdylay_frame *frame,
void *aux_data);
/*
* Adds RST_STREAM frame for the stream |stream_id| with status code
* |status_code|. This is a convenient function built on top of
* spdylay_session_add_frame() to add RST_STREAM easily.
*
* This function returns 0 if it succeeds, or one of the following
* negative error codes:
*
* SPDYLAY_ERR_NOMEM
* Out of memory.
*/
int spdylay_session_add_rst_stream(spdylay_session *session,
int32_t stream_id, uint32_t status_code);
/*
* Adds PING frame with unique ID |unique_id|. This is a convenient
* functin built on top of spdylay_session_add_frame() to add PING
* easily.
*
* This function returns 0 if it succeeds, or one of the following
* negative error codes:
*
* SPDYLAY_ERR_NOMEM
* Out of memory.
*/
int spdylay_session_add_ping(spdylay_session *session, uint32_t unique_id);
/*
* Adds GOAWAY frame with last-good-stream-ID |last_good_stream_id|
* and the status code |status_code|. The |status_code| is ignored if
* the protocol version is SPDYLAY_PROTO_SPDY2. This is a convenient
* function built on top of spdylay_session_add_frame() to add GOAWAY
* easily.
*
* This function returns 0 if it succeeds, or one of the following
* negative error codes:
*
* SPDYLAY_ERR_NOMEM
* Out of memory.
*/
int spdylay_session_add_goaway(spdylay_session *session,
int32_t last_good_stream_id,
uint32_t status_code);
/*
* Adds WINDOW_UPDATE frame with stream ID |stream_id| and
* delta-window-size |delta_window_size|. This is a convenient
* function built on top of spdylay_session_add_frame() to add
* WINDOW_UPDATE easily.
*
* This function returns 0 if it succeeds, or one of the following
* negative error codes:
*
* SPDYLAY_ERR_NOMEM
* Out of memory.
*/
int spdylay_session_add_window_update(spdylay_session *session,
int32_t stream_id,
int32_t delta_window_size);
/*
* Creates new stream in |session| with stream ID |stream_id|,
* priority |pri| and flags |flags|. SPDYLAY_CTRL_FLAG_UNIDIRECTIONAL
* flag is set in |flags|, this stream is
* unidirectional. SPDYLAY_CTRL_FLAG_FIN flag is set in |flags|, the
* sender of SYN_STREAM will not send any further data in this
* stream. Since this function is called when SYN_STREAM is sent or
* received, these flags are taken from SYN_STREAM. The state of
* stream is set to |initial_state|. |stream_user_data| is a pointer
* to the arbitrary user supplied data to be associated to this
* stream.
*
* This function returns a pointer to created new stream object, or
* NULL.
*/
spdylay_stream* spdylay_session_open_stream(spdylay_session *session,
int32_t stream_id,
uint8_t flags, uint8_t pri,
spdylay_stream_state initial_state,
void *stream_user_data);
/*
* Closes stream whose stream ID is |stream_id|. The reason of closure
* is indicated by |status_code|. When closing the stream,
* on_stream_close_callback will be called.
*
* This function returns 0 if it succeeds, or one the following
* negative error codes:
*
* SPDYLAY_ERR_INVALID_ARGUMENT
* The specified stream does not exist.
*/
int spdylay_session_close_stream(spdylay_session *session, int32_t stream_id,
spdylay_status_code status_code);
/*
* Closes all pushed streams which associate them to stream
* |stream_id| with the status code |status_code|.
*/
void spdylay_session_close_pushed_streams(spdylay_session *session,
int32_t stream_id,
spdylay_status_code status_code);
/*
* If further receptions and transmissions over the stream |stream_id|
* are disallowed, close the stream with status code |status_code|.
*
* This function returns 0 if it
* succeeds, or one of the following negative error codes:
*
* SPDYLAY_ERR_INVALID_ARGUMENT
* The specified stream does not exist.
*/
int spdylay_session_close_stream_if_shut_rdwr(spdylay_session *session,
spdylay_stream *stream);
/*
* Called when SYN_STREAM is received, assuming |frame.syn_stream| is
* properly initialized. This function does first validate received
* frame and then open stream and call callback functions. This
* function does not return error if frame is not valid.
*
* This function returns 0 if it succeeds, or one of the following
* negative error codes:
*
* SPDYLAY_ERR_NOMEM
* Out of memory.
*/
int spdylay_session_on_syn_stream_received(spdylay_session *session,
spdylay_frame *frame);
/*
* Called when SYN_REPLY is received, assuming |frame.syn_reply| is
* properly initialized.
*
* This function returns 0 if it succeeds, or one of the following
* negative error codes:
*
* SPDYLAY_ERR_NOMEM
* Out of memory.
*/
int spdylay_session_on_syn_reply_received(spdylay_session *session,
spdylay_frame *frame);
/*
* Called when RST_STREAM is received, assuming |frame.rst_stream| is
* properly initialized.
*
* This function returns 0 and never fail.
*/
int spdylay_session_on_rst_stream_received(spdylay_session *session,
spdylay_frame *frame);
/*
* Called when SETTINGS is received, assuming |frame.settings| is
* properly initialized.
*
* This function returns 0 and never fail.
*/
int spdylay_session_on_settings_received(spdylay_session *session,
spdylay_frame *frame);
/*
* Called when PING is received, assuming |frame.ping| is properly
* initialized.
*
* This function returns 0 if it succeeds, or one of the following
* negative error codes:
*
* SPDYLAY_ERR_NOMEM
* Out of memory.
*/
int spdylay_session_on_ping_received(spdylay_session *session,
spdylay_frame *frame);
/*
* Called when GOAWAY is received, assuming |frame.goaway| is properly
* initialized.
*
* This function returns 0 and never fail.
*/
int spdylay_session_on_goaway_received(spdylay_session *session,
spdylay_frame *frame);
/*
* Called when HEADERS is recieved, assuming |frame.headers| is
* properly initialized.
*
* This function returns 0 if it succeeds, or one of the following
* negative error codes:
*
* SPDYLAY_ERR_NOMEM
* Out of memory.
*/
int spdylay_session_on_headers_received(spdylay_session *session,
spdylay_frame *frame);
/*
* Called when WINDOW_UPDATE is recieved, assuming
* |frame.window_update| is properly initialized.
*
* This function returns 0 if it succeeds, or one of the following
* negative error codes:
*
* SPDYLAY_ERR_NOMEM
* Out of memory.
*/
int spdylay_session_on_window_update_received(spdylay_session *session,
spdylay_frame *frame);
/*
* Called when DATA is received.
*
* This function returns 0 if it succeeds, or one of the following
* negative error codes:
*
* SPDYLAY_ERR_NOMEM
* Out of memory.
*/
int spdylay_session_on_data_received(spdylay_session *session,
uint8_t flags, int32_t length,
int32_t stream_id);
/*
* Returns spdylay_stream* object whose stream ID is |stream_id|. It
* could be NULL if such stream does not exist.
*/
spdylay_stream* spdylay_session_get_stream(spdylay_session *session,
int32_t stream_id);
/*
* Packs DATA frame |frame| in wire frame format and stores it in
* |*buf_ptr|. The capacity of |*buf_ptr| is |*buflen_ptr|
* length. This function expands |*buf_ptr| as necessary to store
* given |frame|. It packs header in first 8 bytes. Remaining bytes
* are the DATA apyload and are filled using |frame->data_prd|. The
* length of payload is at most |datamax| bytes.
*
* This function returns the size of packed frame if it succeeds, or
* one of the following negative error codes:
*
* SPDYLAY_ERR_NOMEM
* Out of memory.
* SPDYLAY_ERR_DEFERRED
* The DATA frame is postponed.
* SPDYLAY_ERR_CALLBACK_FAILURE
* The read_callback failed.
*/
ssize_t spdylay_session_pack_data(spdylay_session *session,
uint8_t **buf_ptr, size_t *buflen_ptr,
size_t datamax,
spdylay_data *frame);
/*
* Returns next unique ID which can be used with PING.
*/
uint32_t spdylay_session_get_next_unique_id(spdylay_session *session);
/*
* Returns top of outbound frame queue. This function returns NULL if
* queue is empty.
*/
spdylay_outbound_item* spdylay_session_get_ob_pq_top(spdylay_session *session);
/*
* Pops and returns next item to send. If there is no such item,
* returns NULL. This function takes into account max concurrent
* streams. That means if session->ob_pq is empty but
* session->ob_ss_pq has item and max concurrent streams is reached,
* then this function returns NULL.
*/
spdylay_outbound_item* spdylay_session_pop_next_ob_item
(spdylay_session *session);
/*
* Returns next item to send. If there is no such item, this function
* returns NULL. This function takes into account max concurrent
* streams. That means if session->ob_pq is empty but
* session->ob_ss_pq has item and max concurrent streams is reached,
* then this function returns NULL.
*/
spdylay_outbound_item* spdylay_session_get_next_ob_item
(spdylay_session *session);
/*
* Returns lowest priority value.
*/
uint8_t spdylay_session_get_pri_lowest(spdylay_session *session);
/*
* Updates local settings with the |iv|. The number of elements in the
* array pointed by the |iv| is given by the |niv|. This function
* assumes that the all settings_id member in |iv| are in range 1 to
* SPDYLAY_SETTINGS_MAX, inclusive.
*/
void spdylay_session_update_local_settings(spdylay_session *session,
spdylay_settings_entry *iv,
size_t niv);
#endif /* SPDYLAY_SESSION_H */
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