mirror of
https://github.com/warmcat/libwebsockets.git
synced 2025-03-16 00:00:07 +01:00
9cb4f25476
This changes the approach of tx credit management to set the initial stream tx credit window to zero. This is the only way with RFC7540 to gain the ability to selectively precisely rx flow control incoming streams. At the time the headers are sent, a WINDOW_UPDATE is sent with the initial tx credit towards us for that specific stream. By default, this acts as before with a 256KB window added for both the stream and the nwsi, and additional window management sent as stuff is received. It's now also possible to set a member in the client info struct and a new option LCCSCF_H2_MANUAL_RXFLOW to precisely manage both the initial tx credit for a specific stream and the ongoing rate limit by meting out further tx credit manually. Add another minimal example http-client-h2-rxflow demonstrating how to force a connection's peer's initial budget to transmit to us and control it during the connection lifetime to restrict the amount of incoming data we have to buffer.
115 lines
3.3 KiB
C
115 lines
3.3 KiB
C
/*
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* libwebsockets - small server side websockets and web server implementation
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*
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* Copyright (C) 2010 - 2019 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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#include "private-lib-core.h"
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int
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lws_plat_context_early_init(void)
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{
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return 0;
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}
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void
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lws_plat_context_early_destroy(struct lws_context *context)
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{
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#if defined(LWS_AMAZON_RTOS)
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mbedtls_ctr_drbg_free(&context->mcdc);
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mbedtls_entropy_free(&context->mec);
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#endif
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}
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void
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lws_plat_context_late_destroy(struct lws_context *context)
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{
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#ifdef LWS_WITH_PLUGINS
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if (context->plugin_list)
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lws_plat_plugins_destroy(context);
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#endif
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if (context->lws_lookup)
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lws_free(context->lws_lookup);
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}
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#if defined(LWS_WITH_HTTP2)
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/*
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* These are the default SETTINGS used on this platform. The user
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* can selectively modify them for a vhost during vhost creation.
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*/
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const struct http2_settings lws_h2_defaults_esp32 = { {
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1,
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/* H2SET_HEADER_TABLE_SIZE */ 512,
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/* H2SET_ENABLE_PUSH */ 0,
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/* H2SET_MAX_CONCURRENT_STREAMS */ 8,
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/* H2SET_INITIAL_WINDOW_SIZE */ 0,
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/* H2SET_MAX_FRAME_SIZE */ 16384,
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/* H2SET_MAX_HEADER_LIST_SIZE */ 512,
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/* H2SET_RESERVED7 */ 0,
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/* H2SET_ENABLE_CONNECT_PROTOCOL */ 1,
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}};
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#endif
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int
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lws_plat_init(struct lws_context *context,
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const struct lws_context_creation_info *info)
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{
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#if defined(LWS_AMAZON_RTOS)
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int n;
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/* initialize platform random through mbedtls */
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mbedtls_entropy_init(&context->mec);
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mbedtls_ctr_drbg_init(&context->mcdc);
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n = mbedtls_ctr_drbg_seed(&context->mcdc, mbedtls_entropy_func,
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&context->mec, NULL, 0);
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if (n) {
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lwsl_err("%s: mbedtls_ctr_drbg_seed() returned 0x%x\n",
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__func__, n);
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return 1;
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}
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#endif
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/* master context has the global fd lookup array */
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context->lws_lookup = lws_zalloc(sizeof(struct lws *) *
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context->max_fds, "esp32 lws_lookup");
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if (context->lws_lookup == NULL) {
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lwsl_err("OOM on lws_lookup array for %d connections\n",
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context->max_fds);
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return 1;
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}
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lwsl_notice(" mem: platform fd map: %5lu bytes\n",
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(unsigned long)(sizeof(struct lws *) * context->max_fds));
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#ifdef LWS_WITH_PLUGINS
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if (info->plugin_dirs)
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lws_plat_plugins_init(context, info->plugin_dirs);
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#endif
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#if defined(LWS_WITH_HTTP2)
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/* override settings */
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context->set = lws_h2_defaults_esp32;
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#endif
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return 0;
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}
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