Mercurial > hg > nginx
view src/http/modules/ngx_http_upstream_keepalive_module.c @ 6949:ff0c8e11edbc
Simplified and improved sendfile() code on Linux.
The ngx_linux_sendfile() function is now used for both normal sendfile()
and sendfile in threads. The ngx_linux_sendfile_thread() function was
modified to use the same interface as ngx_linux_sendfile(), and is simply
called from ngx_linux_sendfile() when threads are enabled.
Special return code NGX_DONE is used to indicate that a thread task was
posted and no further actions are needed.
If number of bytes sent is less that what we were sending, we now always
retry sending. This is needed for sendfile() in threads as the number
of bytes we are sending might have been changed since the thread task
was posted. And this is also needed for Linux 4.3+, as sendfile() might
be interrupted at any time and provides no indication if it was interrupted
or not (ticket #1174).
author | Maxim Dounin <mdounin@mdounin.ru> |
---|---|
date | Tue, 28 Mar 2017 18:15:39 +0300 |
parents | adf25b8d0431 |
children | 1cb92a2d672e |
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/* * Copyright (C) Maxim Dounin * Copyright (C) Nginx, Inc. */ #include <ngx_config.h> #include <ngx_core.h> #include <ngx_http.h> typedef struct { ngx_uint_t max_cached; ngx_queue_t cache; ngx_queue_t free; ngx_http_upstream_init_pt original_init_upstream; ngx_http_upstream_init_peer_pt original_init_peer; } ngx_http_upstream_keepalive_srv_conf_t; typedef struct { ngx_http_upstream_keepalive_srv_conf_t *conf; ngx_queue_t queue; ngx_connection_t *connection; socklen_t socklen; ngx_sockaddr_t sockaddr; } ngx_http_upstream_keepalive_cache_t; typedef struct { ngx_http_upstream_keepalive_srv_conf_t *conf; ngx_http_upstream_t *upstream; void *data; ngx_event_get_peer_pt original_get_peer; ngx_event_free_peer_pt original_free_peer; #if (NGX_HTTP_SSL) ngx_event_set_peer_session_pt original_set_session; ngx_event_save_peer_session_pt original_save_session; #endif } ngx_http_upstream_keepalive_peer_data_t; static ngx_int_t ngx_http_upstream_init_keepalive_peer(ngx_http_request_t *r, ngx_http_upstream_srv_conf_t *us); static ngx_int_t ngx_http_upstream_get_keepalive_peer(ngx_peer_connection_t *pc, void *data); static void ngx_http_upstream_free_keepalive_peer(ngx_peer_connection_t *pc, void *data, ngx_uint_t state); static void ngx_http_upstream_keepalive_dummy_handler(ngx_event_t *ev); static void ngx_http_upstream_keepalive_close_handler(ngx_event_t *ev); static void ngx_http_upstream_keepalive_close(ngx_connection_t *c); #if (NGX_HTTP_SSL) static ngx_int_t ngx_http_upstream_keepalive_set_session( ngx_peer_connection_t *pc, void *data); static void ngx_http_upstream_keepalive_save_session(ngx_peer_connection_t *pc, void *data); #endif static void *ngx_http_upstream_keepalive_create_conf(ngx_conf_t *cf); static char *ngx_http_upstream_keepalive(ngx_conf_t *cf, ngx_command_t *cmd, void *conf); static ngx_command_t ngx_http_upstream_keepalive_commands[] = { { ngx_string("keepalive"), NGX_HTTP_UPS_CONF|NGX_CONF_TAKE1, ngx_http_upstream_keepalive, NGX_HTTP_SRV_CONF_OFFSET, 0, NULL }, ngx_null_command }; static ngx_http_module_t ngx_http_upstream_keepalive_module_ctx = { NULL, /* preconfiguration */ NULL, /* postconfiguration */ NULL, /* create main configuration */ NULL, /* init main configuration */ ngx_http_upstream_keepalive_create_conf, /* create server configuration */ NULL, /* merge server configuration */ NULL, /* create location configuration */ NULL /* merge location configuration */ }; ngx_module_t ngx_http_upstream_keepalive_module = { NGX_MODULE_V1, &ngx_http_upstream_keepalive_module_ctx, /* module context */ ngx_http_upstream_keepalive_commands, /* module directives */ NGX_HTTP_MODULE, /* module type */ NULL, /* init master */ NULL, /* init module */ NULL, /* init process */ NULL, /* init thread */ NULL, /* exit thread */ NULL, /* exit process */ NULL, /* exit master */ NGX_MODULE_V1_PADDING }; static ngx_int_t ngx_http_upstream_init_keepalive(ngx_conf_t *cf, ngx_http_upstream_srv_conf_t *us) { ngx_uint_t i; ngx_http_upstream_keepalive_srv_conf_t *kcf; ngx_http_upstream_keepalive_cache_t *cached; ngx_log_debug0(NGX_LOG_DEBUG_HTTP, cf->log, 0, "init keepalive"); kcf = ngx_http_conf_upstream_srv_conf(us, ngx_http_upstream_keepalive_module); if (kcf->original_init_upstream(cf, us) != NGX_OK) { return NGX_ERROR; } kcf->original_init_peer = us->peer.init; us->peer.init = ngx_http_upstream_init_keepalive_peer; /* allocate cache items and add to free queue */ cached = ngx_pcalloc(cf->pool, sizeof(ngx_http_upstream_keepalive_cache_t) * kcf->max_cached); if (cached == NULL) { return NGX_ERROR; } ngx_queue_init(&kcf->cache); ngx_queue_init(&kcf->free); for (i = 0; i < kcf->max_cached; i++) { ngx_queue_insert_head(&kcf->free, &cached[i].queue); cached[i].conf = kcf; } return NGX_OK; } static ngx_int_t ngx_http_upstream_init_keepalive_peer(ngx_http_request_t *r, ngx_http_upstream_srv_conf_t *us) { ngx_http_upstream_keepalive_peer_data_t *kp; ngx_http_upstream_keepalive_srv_conf_t *kcf; ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, "init keepalive peer"); kcf = ngx_http_conf_upstream_srv_conf(us, ngx_http_upstream_keepalive_module); kp = ngx_palloc(r->pool, sizeof(ngx_http_upstream_keepalive_peer_data_t)); if (kp == NULL) { return NGX_ERROR; } if (kcf->original_init_peer(r, us) != NGX_OK) { return NGX_ERROR; } kp->conf = kcf; kp->upstream = r->upstream; kp->data = r->upstream->peer.data; kp->original_get_peer = r->upstream->peer.get; kp->original_free_peer = r->upstream->peer.free; r->upstream->peer.data = kp; r->upstream->peer.get = ngx_http_upstream_get_keepalive_peer; r->upstream->peer.free = ngx_http_upstream_free_keepalive_peer; #if (NGX_HTTP_SSL) kp->original_set_session = r->upstream->peer.set_session; kp->original_save_session = r->upstream->peer.save_session; r->upstream->peer.set_session = ngx_http_upstream_keepalive_set_session; r->upstream->peer.save_session = ngx_http_upstream_keepalive_save_session; #endif return NGX_OK; } static ngx_int_t ngx_http_upstream_get_keepalive_peer(ngx_peer_connection_t *pc, void *data) { ngx_http_upstream_keepalive_peer_data_t *kp = data; ngx_http_upstream_keepalive_cache_t *item; ngx_int_t rc; ngx_queue_t *q, *cache; ngx_connection_t *c; ngx_log_debug0(NGX_LOG_DEBUG_HTTP, pc->log, 0, "get keepalive peer"); /* ask balancer */ rc = kp->original_get_peer(pc, kp->data); if (rc != NGX_OK) { return rc; } /* search cache for suitable connection */ cache = &kp->conf->cache; for (q = ngx_queue_head(cache); q != ngx_queue_sentinel(cache); q = ngx_queue_next(q)) { item = ngx_queue_data(q, ngx_http_upstream_keepalive_cache_t, queue); c = item->connection; if (ngx_memn2cmp((u_char *) &item->sockaddr, (u_char *) pc->sockaddr, item->socklen, pc->socklen) == 0) { ngx_queue_remove(q); ngx_queue_insert_head(&kp->conf->free, q); goto found; } } return NGX_OK; found: ngx_log_debug1(NGX_LOG_DEBUG_HTTP, pc->log, 0, "get keepalive peer: using connection %p", c); c->idle = 0; c->sent = 0; c->log = pc->log; c->read->log = pc->log; c->write->log = pc->log; c->pool->log = pc->log; pc->connection = c; pc->cached = 1; return NGX_DONE; } static void ngx_http_upstream_free_keepalive_peer(ngx_peer_connection_t *pc, void *data, ngx_uint_t state) { ngx_http_upstream_keepalive_peer_data_t *kp = data; ngx_http_upstream_keepalive_cache_t *item; ngx_queue_t *q; ngx_connection_t *c; ngx_http_upstream_t *u; ngx_log_debug0(NGX_LOG_DEBUG_HTTP, pc->log, 0, "free keepalive peer"); /* cache valid connections */ u = kp->upstream; c = pc->connection; if (state & NGX_PEER_FAILED || c == NULL || c->read->eof || c->read->error || c->read->timedout || c->write->error || c->write->timedout) { goto invalid; } if (!u->keepalive) { goto invalid; } if (!u->request_body_sent) { goto invalid; } if (ngx_terminate || ngx_exiting) { goto invalid; } if (ngx_handle_read_event(c->read, 0) != NGX_OK) { goto invalid; } ngx_log_debug1(NGX_LOG_DEBUG_HTTP, pc->log, 0, "free keepalive peer: saving connection %p", c); if (ngx_queue_empty(&kp->conf->free)) { q = ngx_queue_last(&kp->conf->cache); ngx_queue_remove(q); item = ngx_queue_data(q, ngx_http_upstream_keepalive_cache_t, queue); ngx_http_upstream_keepalive_close(item->connection); } else { q = ngx_queue_head(&kp->conf->free); ngx_queue_remove(q); item = ngx_queue_data(q, ngx_http_upstream_keepalive_cache_t, queue); } ngx_queue_insert_head(&kp->conf->cache, q); item->connection = c; pc->connection = NULL; if (c->read->timer_set) { ngx_del_timer(c->read); } if (c->write->timer_set) { ngx_del_timer(c->write); } c->write->handler = ngx_http_upstream_keepalive_dummy_handler; c->read->handler = ngx_http_upstream_keepalive_close_handler; c->data = item; c->idle = 1; c->log = ngx_cycle->log; c->read->log = ngx_cycle->log; c->write->log = ngx_cycle->log; c->pool->log = ngx_cycle->log; item->socklen = pc->socklen; ngx_memcpy(&item->sockaddr, pc->sockaddr, pc->socklen); if (c->read->ready) { ngx_http_upstream_keepalive_close_handler(c->read); } invalid: kp->original_free_peer(pc, kp->data, state); } static void ngx_http_upstream_keepalive_dummy_handler(ngx_event_t *ev) { ngx_log_debug0(NGX_LOG_DEBUG_HTTP, ev->log, 0, "keepalive dummy handler"); } static void ngx_http_upstream_keepalive_close_handler(ngx_event_t *ev) { ngx_http_upstream_keepalive_srv_conf_t *conf; ngx_http_upstream_keepalive_cache_t *item; int n; char buf[1]; ngx_connection_t *c; ngx_log_debug0(NGX_LOG_DEBUG_HTTP, ev->log, 0, "keepalive close handler"); c = ev->data; if (c->close) { goto close; } n = recv(c->fd, buf, 1, MSG_PEEK); if (n == -1 && ngx_socket_errno == NGX_EAGAIN) { ev->ready = 0; if (ngx_handle_read_event(c->read, 0) != NGX_OK) { goto close; } return; } close: item = c->data; conf = item->conf; ngx_http_upstream_keepalive_close(c); ngx_queue_remove(&item->queue); ngx_queue_insert_head(&conf->free, &item->queue); } static void ngx_http_upstream_keepalive_close(ngx_connection_t *c) { #if (NGX_HTTP_SSL) if (c->ssl) { c->ssl->no_wait_shutdown = 1; c->ssl->no_send_shutdown = 1; if (ngx_ssl_shutdown(c) == NGX_AGAIN) { c->ssl->handler = ngx_http_upstream_keepalive_close; return; } } #endif ngx_destroy_pool(c->pool); ngx_close_connection(c); } #if (NGX_HTTP_SSL) static ngx_int_t ngx_http_upstream_keepalive_set_session(ngx_peer_connection_t *pc, void *data) { ngx_http_upstream_keepalive_peer_data_t *kp = data; return kp->original_set_session(pc, kp->data); } static void ngx_http_upstream_keepalive_save_session(ngx_peer_connection_t *pc, void *data) { ngx_http_upstream_keepalive_peer_data_t *kp = data; kp->original_save_session(pc, kp->data); return; } #endif static void * ngx_http_upstream_keepalive_create_conf(ngx_conf_t *cf) { ngx_http_upstream_keepalive_srv_conf_t *conf; conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_upstream_keepalive_srv_conf_t)); if (conf == NULL) { return NULL; } /* * set by ngx_pcalloc(): * * conf->original_init_upstream = NULL; * conf->original_init_peer = NULL; * conf->max_cached = 0; */ return conf; } static char * ngx_http_upstream_keepalive(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) { ngx_http_upstream_srv_conf_t *uscf; ngx_http_upstream_keepalive_srv_conf_t *kcf = conf; ngx_int_t n; ngx_str_t *value; if (kcf->max_cached) { return "is duplicate"; } /* read options */ value = cf->args->elts; n = ngx_atoi(value[1].data, value[1].len); if (n == NGX_ERROR || n == 0) { ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "invalid value \"%V\" in \"%V\" directive", &value[1], &cmd->name); return NGX_CONF_ERROR; } kcf->max_cached = n; uscf = ngx_http_conf_get_module_srv_conf(cf, ngx_http_upstream_module); kcf->original_init_upstream = uscf->peer.init_upstream ? uscf->peer.init_upstream : ngx_http_upstream_init_round_robin; uscf->peer.init_upstream = ngx_http_upstream_init_keepalive; return NGX_CONF_OK; }