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| -rw-r--r-- | modules/http2/h2_mplx.h | 218 |
1 files changed, 218 insertions, 0 deletions
diff --git a/modules/http2/h2_mplx.h b/modules/http2/h2_mplx.h new file mode 100644 index 0000000..1f79aa8 --- /dev/null +++ b/modules/http2/h2_mplx.h @@ -0,0 +1,218 @@ +/* Licensed to the Apache Software Foundation (ASF) under one or more + * contributor license agreements. See the NOTICE file distributed with + * this work for additional information regarding copyright ownership. + * The ASF licenses this file to You under the Apache License, Version 2.0 + * (the "License"); you may not use this file except in compliance with + * the License. You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +#ifndef __mod_h2__h2_mplx__ +#define __mod_h2__h2_mplx__ + +/** + * The stream multiplexer. It performs communication between the + * primary HTTP/2 connection (c1) to the secondary connections (c2) + * that process the requests, aka. HTTP/2 streams. + * + * There is one h2_mplx instance for each h2_session. + * + * Naming Convention: + * "h2_mplx_c1_" are methods only to be called by the primary connection + * "h2_mplx_c2_" are methods only to be called by a secondary connection + * "h2_mplx_worker_" are methods only to be called by a h2 worker thread + */ + +struct apr_pool_t; +struct apr_thread_mutex_t; +struct apr_thread_cond_t; +struct h2_bucket_beam; +struct h2_config; +struct h2_ihash_t; +struct h2_stream; +struct h2_request; +struct apr_thread_cond_t; +struct h2_workers; +struct h2_iqueue; + +#include <apr_queue.h> + +#include "h2_workers.h" + +typedef struct h2_c2_transit h2_c2_transit; + +struct h2_c2_transit { + apr_pool_t *pool; + apr_bucket_alloc_t *bucket_alloc; +}; + +typedef struct h2_mplx h2_mplx; + +struct h2_mplx { + int child_num; /* child this runs in */ + apr_uint32_t id; /* id unique per child */ + conn_rec *c1; /* the main connection */ + apr_pool_t *pool; + struct h2_stream *stream0; /* HTTP/2's stream 0 */ + server_rec *s; /* server for master conn */ + + int shutdown; /* we are shutting down */ + int aborted; /* we need to get out of here asap */ + int polling; /* is waiting/processing pollset events */ + ap_conn_producer_t *producer; /* registered producer at h2_workers */ + + struct h2_ihash_t *streams; /* all streams active */ + struct h2_ihash_t *shold; /* all streams done with c2 processing ongoing */ + apr_array_header_t *spurge; /* all streams done, ready for destroy */ + + struct h2_iqueue *q; /* all stream ids that need to be started */ + + apr_size_t stream_max_mem; /* max memory to buffer for a stream */ + apr_uint32_t max_streams; /* max # of concurrent streams */ + apr_uint32_t max_stream_id_started; /* highest stream id that started processing */ + + apr_uint32_t processing_count; /* # of c2 working for this mplx */ + apr_uint32_t processing_limit; /* current limit on processing c2s, dynamic */ + apr_uint32_t processing_max; /* max, hard limit of processing c2s */ + + apr_time_t last_mood_change; /* last time, processing limit changed */ + apr_interval_time_t mood_update_interval; /* how frequent we update at most */ + apr_uint32_t irritations_since; /* irritations (>0) or happy events (<0) since last mood change */ + + apr_thread_mutex_t *lock; + struct apr_thread_cond_t *join_wait; + + apr_pollset_t *pollset; /* pollset for c1/c2 IO events */ + apr_array_header_t *streams_ev_in; + apr_array_header_t *streams_ev_out; + + apr_thread_mutex_t *poll_lock; /* protect modifications of queues below */ + struct h2_iqueue *streams_input_read; /* streams whose input has been read from */ + struct h2_iqueue *streams_output_written; /* streams whose output has been written to */ + + struct h2_workers *workers; /* h2 workers process wide instance */ + + request_rec *scratch_r; /* pseudo request_rec for scoreboard reporting */ + + apr_uint32_t max_spare_transits; /* max number of transit pools idling */ + apr_array_header_t *c2_transits; /* base pools for running c2 connections */ +}; + +apr_status_t h2_mplx_c1_child_init(apr_pool_t *pool, server_rec *s); + +/** + * Create the multiplexer for the given HTTP2 session. + * Implicitly has reference count 1. + */ +h2_mplx *h2_mplx_c1_create(int child_id, apr_uint32_t id, + struct h2_stream *stream0, + server_rec *s, apr_pool_t *master, + struct h2_workers *workers); + +/** + * Destroy the mplx, shutting down all ongoing processing. + * @param m the mplx destroyed + * @param wait condition var to wait on for ref counter == 0 + */ +void h2_mplx_c1_destroy(h2_mplx *m); + +/** + * Shut down the multiplexer gracefully. Will no longer schedule new streams + * but let the ongoing ones finish normally. + * @return the highest stream id being/been processed + */ +int h2_mplx_c1_shutdown(h2_mplx *m); + +/** + * Notifies mplx that a stream has been completely handled on the main + * connection and is ready for cleanup. + * + * @param m the mplx itself + * @param stream the stream ready for cleanup + * @param pstream_count return the number of streams active + */ +apr_status_t h2_mplx_c1_stream_cleanup(h2_mplx *m, struct h2_stream *stream, + unsigned int *pstream_count); + +int h2_mplx_c1_stream_is_running(h2_mplx *m, struct h2_stream *stream); + +/** + * Process a stream request. + * + * @param m the multiplexer + * @param read_to_process + * @param input_pending + * @param cmp the stream priority compare function + * @param pstream_count on return the number of streams active in mplx + */ +void h2_mplx_c1_process(h2_mplx *m, + struct h2_iqueue *read_to_process, + h2_stream_get_fn *get_stream, + h2_stream_pri_cmp_fn *cmp, + struct h2_session *session, + unsigned int *pstream_count); + +/** + * Stream priorities have changed, reschedule pending requests. + * + * @param m the multiplexer + * @param cmp the stream priority compare function + * @param ctx context data for the compare function + */ +apr_status_t h2_mplx_c1_reprioritize(h2_mplx *m, h2_stream_pri_cmp_fn *cmp, + struct h2_session *session); + +typedef void stream_ev_callback(void *ctx, struct h2_stream *stream); + +/** + * Poll the primary connection for input and the active streams for output. + * Invoke the callback for any stream where an event happened. + */ +apr_status_t h2_mplx_c1_poll(h2_mplx *m, apr_interval_time_t timeout, + stream_ev_callback *on_stream_input, + stream_ev_callback *on_stream_output, + void *on_ctx); + +void h2_mplx_c2_input_read(h2_mplx *m, conn_rec *c2); +void h2_mplx_c2_output_written(h2_mplx *m, conn_rec *c2); + +typedef int h2_mplx_stream_cb(struct h2_stream *s, void *userdata); + +/** + * Iterate over all streams known to mplx from the primary connection. + * @param m the mplx + * @param cb the callback to invoke on each stream + * @param ctx userdata passed to the callback + */ +apr_status_t h2_mplx_c1_streams_do(h2_mplx *m, h2_mplx_stream_cb *cb, void *ctx); + +/** + * A stream has been RST_STREAM by the client. Abort + * any processing going on and remove from processing + * queue. + */ +apr_status_t h2_mplx_c1_client_rst(h2_mplx *m, int stream_id); + +/** + * Get readonly access to a stream for a secondary connection. + */ +const struct h2_stream *h2_mplx_c2_stream_get(h2_mplx *m, int stream_id); + +/** + * A h2 worker asks for a secondary connection to process. + * @param out_c2 non-NULL, a pointer where to reveive the next + * secondary connection to process. + */ +apr_status_t h2_mplx_worker_pop_c2(h2_mplx *m, conn_rec **out_c2); + +#define H2_MPLX_MSG(m, msg) \ + "h2_mplx(%d-%lu): "msg, m->child_num, (unsigned long)m->id + +#endif /* defined(__mod_h2__h2_mplx__) */ |