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8eca7e17f2
- Add low level system message distibution framework - Add support for local Secure Streams to participate using _lws_smd streamtype - Add apit test and minimal example - Add SS proxy support for _lws_smd See minimal-secure-streams-smd README.md
114 lines
3.3 KiB
C
114 lines
3.3 KiB
C
/*
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* lws System Message Distribution
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*
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* Copyright (C) 2019 - 2020 Andy Green <andy@warmcat.com>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to
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* deal in the Software without restriction, including without limitation the
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* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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* sell copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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* IN THE SOFTWARE.
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*/
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/*
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* Number of seconds registered peers must remain as zombies to handle in-flight
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* older messages correctly
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*/
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#if !defined(LWS_SMD_INFLIGHT_GRACE_SECS)
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#define LWS_SMD_INFLIGHT_GRACE_SECS (2)
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#endif
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#if !defined(LWS_SMD_MAX_QUEUE_DEPTH)
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#define LWS_SMD_MAX_QUEUE_DEPTH (12)
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#endif
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#if defined(LWS_WITH_SECURE_STREAMS)
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#define LWS_SMD_SS_RX_HEADER_LEN_EFF (LWS_SMD_SS_RX_HEADER_LEN)
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#else
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#define LWS_SMD_SS_RX_HEADER_LEN_EFF (0)
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#endif
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typedef struct lws_smd_msg {
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lws_dll2_t list;
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lws_usec_t timestamp;
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lws_smd_class_t _class;
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uint16_t length;
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uint16_t refcount;
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/* message itself is over-allocated after this */
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} lws_smd_msg_t;
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/*
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* The peer's relationship to the lws instance doing the distribution
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*/
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typedef enum {
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LSMDT_SAME_PROCESS, /* we call him back ourselves */
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LSMDT_SECURE_STREAMS_LOCAL, /* we call him back ourselves */
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LSMDT_SECURE_STREAMS_PROXIED, /* we ask to write and wait */
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} lws_smd_type_t;
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typedef struct lws_smd_peer {
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lws_dll2_t list;
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lws_usec_t timestamp_joined;
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lws_usec_t timestamp_left;
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#if defined(LWS_WITH_SECURE_STREAMS)
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lws_ss_handle_t *ss_handle; /* LSMDT_SECURE_STREAMS */
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#endif
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lws_smd_notification_cb_t cb; /* LSMDT_<other> */
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void *opaque;
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/* NULL, or next message we will handle */
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lws_smd_msg_t *tail;
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lws_smd_class_t _class_filter;
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lws_smd_type_t type;
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} lws_smd_peer_t;
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/*
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* Manages message distribution
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*
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* There is one of these in the lws_context, but the distribution action also
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* gets involved in delivering to pt event loops individually for SMP case
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*/
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typedef struct lws_smd {
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lws_dll2_owner_t owner_messages; /* lws_smd_msg_t */
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lws_mutex_t lock_messages;
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lws_dll2_owner_t owner_peers; /* lws_smd_peer_t */
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lws_mutex_t lock_peers;
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/* union of peer class filters, suppress creation of msg classes not set */
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lws_smd_class_t _class_filter;
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lws_sorted_usec_list_t sul_tail_stale;
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char delivering;
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} lws_smd_t;
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/* check if this tsi has pending messages to deliver */
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int
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lws_smd_message_pending(struct lws_context *ctx);
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int
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lws_smd_msg_distribute(struct lws_context *ctx);
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int
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_lws_smd_destroy(struct lws_context *ctx);
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