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Diffstat (limited to 'lib/nghttp2_stream.h')
| -rw-r--r-- | lib/nghttp2_stream.h | 441 |
1 files changed, 441 insertions, 0 deletions
diff --git a/lib/nghttp2_stream.h b/lib/nghttp2_stream.h new file mode 100644 index 0000000..71b9fb1 --- /dev/null +++ b/lib/nghttp2_stream.h @@ -0,0 +1,441 @@ +/* + * nghttp2 - HTTP/2 C 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 NGHTTP2_STREAM_H +#define NGHTTP2_STREAM_H + +#ifdef HAVE_CONFIG_H +# include <config.h> +#endif /* HAVE_CONFIG_H */ + +#include <nghttp2/nghttp2.h> +#include "nghttp2_outbound_item.h" +#include "nghttp2_map.h" +#include "nghttp2_pq.h" +#include "nghttp2_int.h" + +/* + * If local peer is stream initiator: + * NGHTTP2_STREAM_OPENING : upon sending request HEADERS + * NGHTTP2_STREAM_OPENED : upon receiving response HEADERS + * NGHTTP2_STREAM_CLOSING : upon queuing RST_STREAM + * + * If remote peer is stream initiator: + * NGHTTP2_STREAM_OPENING : upon receiving request HEADERS + * NGHTTP2_STREAM_OPENED : upon sending response HEADERS + * NGHTTP2_STREAM_CLOSING : upon queuing RST_STREAM + */ +typedef enum { + /* Initial state */ + NGHTTP2_STREAM_INITIAL, + /* For stream initiator: request HEADERS has been sent, but response + HEADERS has not been received yet. For receiver: request HEADERS + has been received, but it does not send response HEADERS yet. */ + NGHTTP2_STREAM_OPENING, + /* For stream initiator: response HEADERS is received. For receiver: + response HEADERS is sent. */ + NGHTTP2_STREAM_OPENED, + /* RST_STREAM is received, but somehow we need to keep stream in + memory. */ + NGHTTP2_STREAM_CLOSING, + /* PUSH_PROMISE is received or sent */ + NGHTTP2_STREAM_RESERVED, + /* Stream is created in this state if it is used as anchor in + dependency tree. */ + NGHTTP2_STREAM_IDLE +} nghttp2_stream_state; + +typedef enum { + NGHTTP2_SHUT_NONE = 0, + /* Indicates further receptions will be disallowed. */ + NGHTTP2_SHUT_RD = 0x01, + /* Indicates further transmissions will be disallowed. */ + NGHTTP2_SHUT_WR = 0x02, + /* Indicates both further receptions and transmissions will be + disallowed. */ + NGHTTP2_SHUT_RDWR = NGHTTP2_SHUT_RD | NGHTTP2_SHUT_WR +} nghttp2_shut_flag; + +typedef enum { + NGHTTP2_STREAM_FLAG_NONE = 0, + /* Indicates that this stream is pushed stream and not opened + yet. */ + NGHTTP2_STREAM_FLAG_PUSH = 0x01, + /* Indicates that this stream was closed */ + NGHTTP2_STREAM_FLAG_CLOSED = 0x02, + /* Indicates the item is deferred due to flow control. */ + NGHTTP2_STREAM_FLAG_DEFERRED_FLOW_CONTROL = 0x04, + /* Indicates the item is deferred by user callback */ + NGHTTP2_STREAM_FLAG_DEFERRED_USER = 0x08, + /* bitwise OR of NGHTTP2_STREAM_FLAG_DEFERRED_FLOW_CONTROL and + NGHTTP2_STREAM_FLAG_DEFERRED_USER. */ + NGHTTP2_STREAM_FLAG_DEFERRED_ALL = 0x0c, + /* Indicates that this stream is not subject to RFC7540 + priorities scheme. */ + NGHTTP2_STREAM_FLAG_NO_RFC7540_PRIORITIES = 0x10, + /* Ignore client RFC 9218 priority signal. */ + NGHTTP2_STREAM_FLAG_IGNORE_CLIENT_PRIORITIES = 0x20, + /* Indicates that RFC 9113 leading and trailing white spaces + validation against a field value is not performed. */ + NGHTTP2_STREAM_FLAG_NO_RFC9113_LEADING_AND_TRAILING_WS_VALIDATION = 0x40, +} nghttp2_stream_flag; + +/* HTTP related flags to enforce HTTP semantics */ +typedef enum { + NGHTTP2_HTTP_FLAG_NONE = 0, + /* header field seen so far */ + NGHTTP2_HTTP_FLAG__AUTHORITY = 1, + NGHTTP2_HTTP_FLAG__PATH = 1 << 1, + NGHTTP2_HTTP_FLAG__METHOD = 1 << 2, + NGHTTP2_HTTP_FLAG__SCHEME = 1 << 3, + /* host is not pseudo header, but we require either host or + :authority */ + NGHTTP2_HTTP_FLAG_HOST = 1 << 4, + NGHTTP2_HTTP_FLAG__STATUS = 1 << 5, + /* required header fields for HTTP request except for CONNECT + method. */ + NGHTTP2_HTTP_FLAG_REQ_HEADERS = NGHTTP2_HTTP_FLAG__METHOD | + NGHTTP2_HTTP_FLAG__PATH | + NGHTTP2_HTTP_FLAG__SCHEME, + NGHTTP2_HTTP_FLAG_PSEUDO_HEADER_DISALLOWED = 1 << 6, + /* HTTP method flags */ + NGHTTP2_HTTP_FLAG_METH_CONNECT = 1 << 7, + NGHTTP2_HTTP_FLAG_METH_HEAD = 1 << 8, + NGHTTP2_HTTP_FLAG_METH_OPTIONS = 1 << 9, + NGHTTP2_HTTP_FLAG_METH_UPGRADE_WORKAROUND = 1 << 10, + NGHTTP2_HTTP_FLAG_METH_ALL = NGHTTP2_HTTP_FLAG_METH_CONNECT | + NGHTTP2_HTTP_FLAG_METH_HEAD | + NGHTTP2_HTTP_FLAG_METH_OPTIONS | + NGHTTP2_HTTP_FLAG_METH_UPGRADE_WORKAROUND, + /* :path category */ + /* path starts with "/" */ + NGHTTP2_HTTP_FLAG_PATH_REGULAR = 1 << 11, + /* path "*" */ + NGHTTP2_HTTP_FLAG_PATH_ASTERISK = 1 << 12, + /* scheme */ + /* "http" or "https" scheme */ + NGHTTP2_HTTP_FLAG_SCHEME_HTTP = 1 << 13, + /* set if final response is expected */ + NGHTTP2_HTTP_FLAG_EXPECT_FINAL_RESPONSE = 1 << 14, + NGHTTP2_HTTP_FLAG__PROTOCOL = 1 << 15, + /* set if priority header field is received */ + NGHTTP2_HTTP_FLAG_PRIORITY = 1 << 16, + /* set if an error is encountered while parsing priority header + field */ + NGHTTP2_HTTP_FLAG_BAD_PRIORITY = 1 << 17, +} nghttp2_http_flag; + +struct nghttp2_stream { + /* Entry for dep_prev->obq */ + nghttp2_pq_entry pq_entry; + /* Priority Queue storing direct descendant (nghttp2_stream). Only + streams which itself has some data to send, or has a descendant + which has some data to sent. */ + nghttp2_pq obq; + /* Content-Length of request/response body. -1 if unknown. */ + int64_t content_length; + /* Received body so far */ + int64_t recv_content_length; + /* Base last_cycle for direct descendent streams. */ + uint64_t descendant_last_cycle; + /* Next scheduled time to sent item */ + uint64_t cycle; + /* Next seq used for direct descendant streams */ + uint64_t descendant_next_seq; + /* Secondary key for prioritization to break a tie for cycle. This + value is monotonically increased for single parent stream. */ + uint64_t seq; + /* pointers to form dependency tree. If multiple streams depend on + a stream, only one stream (left most) has non-NULL dep_prev which + points to the stream it depends on. The remaining streams are + linked using sib_prev and sib_next. The stream which has + non-NULL dep_prev always NULL sib_prev. The right most stream + has NULL sib_next. If this stream is a root of dependency tree, + dep_prev and sib_prev are NULL. */ + nghttp2_stream *dep_prev, *dep_next; + nghttp2_stream *sib_prev, *sib_next; + /* When stream is kept after closure, it may be kept in doubly + linked list pointed by nghttp2_session closed_stream_head. + closed_next points to the next stream object if it is the element + of the list. */ + nghttp2_stream *closed_prev, *closed_next; + /* The arbitrary data provided by user for this stream. */ + void *stream_user_data; + /* Item to send */ + nghttp2_outbound_item *item; + /* Last written length of frame payload */ + size_t last_writelen; + /* stream ID */ + int32_t stream_id; + /* Current remote window size. This value is computed against the + current initial window size of remote endpoint. */ + int32_t remote_window_size; + /* Keep track of the number of bytes received without + WINDOW_UPDATE. This could be negative after submitting negative + value to WINDOW_UPDATE */ + int32_t recv_window_size; + /* The number of bytes consumed by the application and now is + subject to WINDOW_UPDATE. This is only used when auto + WINDOW_UPDATE is turned off. */ + int32_t consumed_size; + /* The amount of recv_window_size cut using submitting negative + value to WINDOW_UPDATE */ + int32_t recv_reduction; + /* window size for local flow control. It is initially set to + NGHTTP2_INITIAL_WINDOW_SIZE and could be increased/decreased by + submitting WINDOW_UPDATE. See nghttp2_submit_window_update(). */ + int32_t local_window_size; + /* weight of this stream */ + int32_t weight; + /* This is unpaid penalty (offset) when calculating cycle. */ + uint32_t pending_penalty; + /* sum of weight of direct descendants */ + int32_t sum_dep_weight; + nghttp2_stream_state state; + /* status code from remote server */ + int16_t status_code; + /* Bitwise OR of zero or more nghttp2_http_flag values */ + uint32_t http_flags; + /* This is bitwise-OR of 0 or more of nghttp2_stream_flag. */ + uint8_t flags; + /* Bitwise OR of zero or more nghttp2_shut_flag values */ + uint8_t shut_flags; + /* Nonzero if this stream has been queued to stream pointed by + dep_prev. We maintain the invariant that if a stream is queued, + then its ancestors, except for root, are also queued. This + invariant may break in fatal error condition. */ + uint8_t queued; + /* This flag is used to reduce excessive queuing of WINDOW_UPDATE to + this stream. The nonzero does not necessarily mean WINDOW_UPDATE + is not queued. */ + uint8_t window_update_queued; + /* extpri is a stream priority produced by nghttp2_extpri_to_uint8 + used by RFC 9218 extensible priorities. */ + uint8_t extpri; + /* http_extpri is a stream priority received in HTTP request header + fields and produced by nghttp2_extpri_to_uint8. */ + uint8_t http_extpri; +}; + +void nghttp2_stream_init(nghttp2_stream *stream, int32_t stream_id, + uint8_t flags, nghttp2_stream_state initial_state, + int32_t weight, int32_t remote_initial_window_size, + int32_t local_initial_window_size, + void *stream_user_data, nghttp2_mem *mem); + +void nghttp2_stream_free(nghttp2_stream *stream); + +/* + * Disallow either further receptions or transmissions, or both. + * |flag| is bitwise OR of one or more of nghttp2_shut_flag. + */ +void nghttp2_stream_shutdown(nghttp2_stream *stream, nghttp2_shut_flag flag); + +/* + * Defer |stream->item|. We won't call this function in the situation + * where |stream->item| == NULL. The |flags| is bitwise OR of zero or + * more of NGHTTP2_STREAM_FLAG_DEFERRED_USER and + * NGHTTP2_STREAM_FLAG_DEFERRED_FLOW_CONTROL. The |flags| indicates + * the reason of this action. + */ +void nghttp2_stream_defer_item(nghttp2_stream *stream, uint8_t flags); + +/* + * Put back deferred data in this stream to active state. The |flags| + * are one or more of bitwise OR of the following values: + * NGHTTP2_STREAM_FLAG_DEFERRED_USER and + * NGHTTP2_STREAM_FLAG_DEFERRED_FLOW_CONTROL and given masks are + * cleared if they are set. So even if this function is called, if + * one of flag is still set, data does not become active. + * + * This function returns 0 if it succeeds, or one of the following + * negative error codes: + * + * NGHTTP2_ERR_NOMEM + * Out of memory + */ +int nghttp2_stream_resume_deferred_item(nghttp2_stream *stream, uint8_t flags); + +/* + * Returns nonzero if item is deferred by whatever reason. + */ +int nghttp2_stream_check_deferred_item(nghttp2_stream *stream); + +/* + * Returns nonzero if item is deferred by flow control. + */ +int nghttp2_stream_check_deferred_by_flow_control(nghttp2_stream *stream); + +/* + * Updates the remote window size with the new value + * |new_initial_window_size|. The |old_initial_window_size| is used to + * calculate the current window size. + * + * This function returns 0 if it succeeds or -1. The failure is due to + * overflow. + */ +int nghttp2_stream_update_remote_initial_window_size( + nghttp2_stream *stream, int32_t new_initial_window_size, + int32_t old_initial_window_size); + +/* + * Updates the local window size with the new value + * |new_initial_window_size|. The |old_initial_window_size| is used to + * calculate the current window size. + * + * This function returns 0 if it succeeds or -1. The failure is due to + * overflow. + */ +int nghttp2_stream_update_local_initial_window_size( + nghttp2_stream *stream, int32_t new_initial_window_size, + int32_t old_initial_window_size); + +/* + * Call this function if promised stream |stream| is replied with + * HEADERS. This function makes the state of the |stream| to + * NGHTTP2_STREAM_OPENED. + */ +void nghttp2_stream_promise_fulfilled(nghttp2_stream *stream); + +/* + * Returns nonzero if |target| is an ancestor of |stream|. + */ +int nghttp2_stream_dep_find_ancestor(nghttp2_stream *stream, + nghttp2_stream *target); + +/* + * Computes distributed weight of a stream of the |weight| under the + * |stream| if |stream| is removed from a dependency tree. + */ +int32_t nghttp2_stream_dep_distributed_weight(nghttp2_stream *stream, + int32_t weight); + +/* + * Makes the |stream| depend on the |dep_stream|. This dependency is + * exclusive. All existing direct descendants of |dep_stream| become + * the descendants of the |stream|. This function assumes + * |stream->item| is NULL. + * + * This function returns 0 if it succeeds, or one of the following + * negative error codes: + * + * NGHTTP2_ERR_NOMEM + * Out of memory + */ +int nghttp2_stream_dep_insert(nghttp2_stream *dep_stream, + nghttp2_stream *stream); + +/* + * Makes the |stream| depend on the |dep_stream|. This dependency is + * not exclusive. This function assumes |stream->item| is NULL. + */ +void nghttp2_stream_dep_add(nghttp2_stream *dep_stream, nghttp2_stream *stream); + +/* + * Removes the |stream| from the current dependency tree. This + * function assumes |stream->item| is NULL. + */ +int nghttp2_stream_dep_remove(nghttp2_stream *stream); + +/* + * Attaches |item| to |stream|. + * + * This function returns 0 if it succeeds, or one of the following + * negative error codes: + * + * NGHTTP2_ERR_NOMEM + * Out of memory + */ +int nghttp2_stream_attach_item(nghttp2_stream *stream, + nghttp2_outbound_item *item); + +/* + * Detaches |stream->item|. This function does not free + * |stream->item|. The caller must free it. + */ +void nghttp2_stream_detach_item(nghttp2_stream *stream); + +/* + * Makes the |stream| depend on the |dep_stream|. This dependency is + * exclusive. + * + * This function returns 0 if it succeeds, or one of the following + * negative error codes: + * + * NGHTTP2_ERR_NOMEM + * Out of memory + */ +int nghttp2_stream_dep_insert_subtree(nghttp2_stream *dep_stream, + nghttp2_stream *stream); + +/* + * Makes the |stream| depend on the |dep_stream|. This dependency is + * not exclusive. + * + * This function returns 0 if it succeeds, or one of the following + * negative error codes: + * + * NGHTTP2_ERR_NOMEM + * Out of memory + */ +int nghttp2_stream_dep_add_subtree(nghttp2_stream *dep_stream, + nghttp2_stream *stream); + +/* + * Removes subtree whose root stream is |stream|. The + * effective_weight of streams in removed subtree is not updated. + * + * This function returns 0 if it succeeds, or one of the following + * negative error codes: + * + * NGHTTP2_ERR_NOMEM + * Out of memory + */ +void nghttp2_stream_dep_remove_subtree(nghttp2_stream *stream); + +/* + * Returns nonzero if |stream| is in any dependency tree. + */ +int nghttp2_stream_in_dep_tree(nghttp2_stream *stream); + +/* + * Schedules transmission of |stream|'s item, assuming stream->item is + * attached, and stream->last_writelen was updated. + */ +void nghttp2_stream_reschedule(nghttp2_stream *stream); + +/* + * Changes |stream|'s weight to |weight|. If |stream| is queued, it + * will be rescheduled based on new weight. + */ +void nghttp2_stream_change_weight(nghttp2_stream *stream, int32_t weight); + +/* + * Returns a stream which has highest priority, updating + * descendant_last_cycle of selected stream's ancestors. + */ +nghttp2_outbound_item * +nghttp2_stream_next_outbound_item(nghttp2_stream *stream); + +#endif /* NGHTTP2_STREAM */ |