Mercurial > hg > nginx-quic
view src/http/v3/ngx_http_v3.c @ 8759:56dec0d4e5b1 quic
QUIC: avoid excessive buffer allocations in stream output.
Previously, when a few bytes were send to a QUIC stream by the application, a
4K buffer was allocated for these bytes. Then a STREAM frame was created and
that entire buffer was used as data for that frame. The frame with the buffer
were in use up until the frame was acked by client. Meanwhile, when more
bytes were send to the stream, more buffers were allocated and assigned as
data to newer STREAM frames. In this scenario most buffer memory is unused.
Now the unused part of the stream output buffer is available for further
stream output while earlier parts of the buffer are waiting to be acked.
This is achieved by splitting the output buffer.
author | Roman Arutyunyan <arut@nginx.com> |
---|---|
date | Fri, 24 Dec 2021 18:13:51 +0300 |
parents | 925572184d4a |
children | 6434160b4b78 |
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/* * Copyright (C) Roman Arutyunyan * Copyright (C) Nginx, Inc. */ #include <ngx_config.h> #include <ngx_core.h> #include <ngx_http.h> static void ngx_http_v3_keepalive_handler(ngx_event_t *ev); static void ngx_http_v3_cleanup_session(void *data); ngx_int_t ngx_http_v3_init_session(ngx_connection_t *c) { ngx_connection_t *pc; ngx_pool_cleanup_t *cln; ngx_http_connection_t *hc; ngx_http_v3_session_t *h3c; pc = c->quic->parent; hc = pc->data; if (hc->v3_session) { return NGX_OK; } ngx_log_debug0(NGX_LOG_DEBUG_HTTP, c->log, 0, "http3 init session"); h3c = ngx_pcalloc(pc->pool, sizeof(ngx_http_v3_session_t)); if (h3c == NULL) { goto failed; } h3c->max_push_id = (uint64_t) -1; h3c->goaway_push_id = (uint64_t) -1; ngx_queue_init(&h3c->blocked); ngx_queue_init(&h3c->pushing); h3c->keepalive.log = pc->log; h3c->keepalive.data = pc; h3c->keepalive.handler = ngx_http_v3_keepalive_handler; h3c->keepalive.cancelable = 1; cln = ngx_pool_cleanup_add(pc->pool, 0); if (cln == NULL) { goto failed; } cln->handler = ngx_http_v3_cleanup_session; cln->data = h3c; hc->v3_session = h3c; return ngx_http_v3_send_settings(c); failed: ngx_log_error(NGX_LOG_ERR, c->log, 0, "failed to create http3 session"); ngx_http_v3_finalize_connection(c, NGX_HTTP_V3_ERR_INTERNAL_ERROR, "failed to create http3 session"); return NGX_ERROR; } static void ngx_http_v3_keepalive_handler(ngx_event_t *ev) { ngx_connection_t *c; c = ev->data; ngx_log_debug0(NGX_LOG_DEBUG_HTTP, c->log, 0, "http3 keepalive handler"); ngx_quic_finalize_connection(c, NGX_HTTP_V3_ERR_NO_ERROR, "keepalive timeout"); } static void ngx_http_v3_cleanup_session(void *data) { ngx_http_v3_session_t *h3c = data; ngx_http_v3_cleanup_table(h3c); if (h3c->keepalive.timer_set) { ngx_del_timer(&h3c->keepalive); } } ngx_int_t ngx_http_v3_check_flood(ngx_connection_t *c) { ngx_http_v3_session_t *h3c; h3c = ngx_http_v3_get_session(c); if (h3c->total_bytes / 8 > h3c->payload_bytes + 1048576) { ngx_log_error(NGX_LOG_INFO, c->log, 0, "http3 flood detected"); ngx_http_v3_finalize_connection(c, NGX_HTTP_V3_ERR_NO_ERROR, "HTTP/3 flood detected"); return NGX_ERROR; } return NGX_OK; }