Mercurial > hg > nginx
diff src/http/modules/proxy/ngx_http_proxy_handler.c @ 170:c42be4185301
nginx-0.0.1-2003-11-03-01:56:18 import
| author | Igor Sysoev <igor@sysoev.ru> |
|---|---|
| date | Sun, 02 Nov 2003 22:56:18 +0000 |
| parents | edf29bb717da |
| children | aff0e5d32af8 |
line wrap: on
line diff
--- a/src/http/modules/proxy/ngx_http_proxy_handler.c +++ b/src/http/modules/proxy/ngx_http_proxy_handler.c @@ -1,26 +1,24 @@ #include <ngx_config.h> #include <ngx_core.h> -#include <ngx_event.h> -#include <ngx_event_connect.h> -#include <ngx_event_pipe.h> #include <ngx_http.h> #include <ngx_http_proxy_handler.h> - static int ngx_http_proxy_handler(ngx_http_request_t *r); +static int ngx_http_proxy_request_upstream(ngx_http_proxy_ctx_t *p); static void ngx_http_proxy_init_request(void *data); static ngx_chain_t *ngx_http_proxy_create_request(ngx_http_proxy_ctx_t *p); static void ngx_http_proxy_send_request_handler(ngx_event_t *wev); +static void ngx_http_proxy_connect(ngx_http_proxy_ctx_t *p); static void ngx_http_proxy_send_request(ngx_http_proxy_ctx_t *p); static void ngx_http_proxy_process_upstream_status_line(ngx_event_t *rev); static void ngx_http_proxy_process_upstream_headers(ngx_event_t *rev); static ssize_t ngx_http_proxy_read_upstream_header(ngx_http_proxy_ctx_t *); static void ngx_http_proxy_send_response(ngx_http_proxy_ctx_t *p); static void ngx_http_proxy_process_body(ngx_event_t *ev); +static int ngx_http_proxy_update_cache(ngx_http_proxy_ctx_t *p); -static int ngx_http_proxy_parse_status_line(ngx_http_proxy_ctx_t *p); static void ngx_http_proxy_next_upstream(ngx_http_proxy_ctx_t *p, int ft_type); static int ngx_http_proxy_log_state(ngx_http_proxy_ctx_t *p, int status); static void ngx_http_proxy_finalize_request(ngx_http_proxy_ctx_t *p, int rc); @@ -42,8 +40,20 @@ static char *ngx_http_proxy_parse_upstre static ngx_conf_bitmask_t next_upstream_masks[] = { { ngx_string("error"), NGX_HTTP_PROXY_FT_ERROR }, { ngx_string("timeout"), NGX_HTTP_PROXY_FT_TIMEOUT }, - { ngx_string("http_header"), NGX_HTTP_PROXY_FT_HTTP_HEADER }, + { ngx_string("invalid_header"), NGX_HTTP_PROXY_FT_INVALID_HEADER }, { ngx_string("http_500"), NGX_HTTP_PROXY_FT_HTTP_500 }, + { ngx_string("http_404"), NGX_HTTP_PROXY_FT_HTTP_404 }, + { ngx_null_string, 0 } +}; + + +static ngx_conf_bitmask_t use_stale_masks[] = { + { ngx_string("error"), NGX_HTTP_PROXY_FT_ERROR }, + { ngx_string("timeout"), NGX_HTTP_PROXY_FT_TIMEOUT }, + { ngx_string("invalid_header"), NGX_HTTP_PROXY_FT_INVALID_HEADER }, + { ngx_string("http_500"), NGX_HTTP_PROXY_FT_HTTP_500 }, + { ngx_string("busy_lock"), NGX_HTTP_PROXY_FT_BUSY_LOCK }, + { ngx_string("max_waiting"), NGX_HTTP_PROXY_FT_MAX_WAITING }, { ngx_null_string, 0 } }; @@ -105,6 +115,13 @@ static ngx_command_t ngx_http_proxy_com offsetof(ngx_http_proxy_loc_conf_t, busy_buffers_size), NULL }, + { ngx_string("proxy_cache_path"), + NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1234, + ngx_conf_set_path_slot, + NGX_HTTP_LOC_CONF_OFFSET, + offsetof(ngx_http_proxy_loc_conf_t, cache_path), + NULL }, + { ngx_string("proxy_temp_path"), NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1234, ngx_conf_set_path_slot, @@ -119,6 +136,13 @@ static ngx_command_t ngx_http_proxy_com offsetof(ngx_http_proxy_loc_conf_t, temp_file_write_size), NULL }, + { ngx_string("proxy_cache"), + NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_FLAG, + ngx_conf_set_flag_slot, + NGX_HTTP_LOC_CONF_OFFSET, + offsetof(ngx_http_proxy_loc_conf_t, cache), + NULL }, + { ngx_string("proxy_pass_server"), NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_FLAG, ngx_conf_set_flag_slot, @@ -133,6 +157,13 @@ static ngx_command_t ngx_http_proxy_com offsetof(ngx_http_proxy_loc_conf_t, next_upstream), &next_upstream_masks }, + { ngx_string("proxy_use_stale"), + NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_ANY, + ngx_conf_set_bitmask_slot, + NGX_HTTP_LOC_CONF_OFFSET, + offsetof(ngx_http_proxy_loc_conf_t, use_stale), + &use_stale_masks }, + ngx_null_command }; @@ -172,7 +203,7 @@ static char *upstream_header_errors[] = }; -static ngx_http_header_t headers_in[] = { +ngx_http_header_t ngx_http_proxy_headers_in[] = { { ngx_string("Date"), offsetof(ngx_http_proxy_headers_in_t, date) }, { ngx_string("Server"), offsetof(ngx_http_proxy_headers_in_t, server) }, { ngx_string("Connection"), @@ -198,13 +229,50 @@ static char connection_close_header[] = static int ngx_http_proxy_handler(ngx_http_request_t *r) { - ngx_http_proxy_ctx_t *p; + int rc; + char *last; + ngx_http_cache_ctx_t *cctx; + ngx_http_proxy_ctx_t *p; + ngx_http_proxy_upstream_t *u; ngx_http_create_ctx(r, p, ngx_http_proxy_module, sizeof(ngx_http_proxy_ctx_t), NGX_HTTP_INTERNAL_SERVER_ERROR); p->lcf = ngx_http_get_module_loc_conf(r, ngx_http_proxy_module); + p->request = r; + + /* TODO: we currently support reverse proxy only */ + p->accel = 1; + + if (!p->lcf->cache || r->bypass_cache) { + return ngx_http_proxy_request_upstream(p); + } + + rc = ngx_http_proxy_get_cached_response(p); + + if (rc == NGX_OK) { + return ngx_http_proxy_process_cached_response(p); + } + + if (rc == NGX_HTTP_INTERNAL_SERVER_ERROR) { + return rc; + } + + if (rc == NGX_DECLINED || rc == NGX_STALE) { + return ngx_http_proxy_request_upstream(p); + } + + return NGX_DONE; +} + + +static int ngx_http_proxy_request_upstream(ngx_http_proxy_ctx_t *p) +{ + ngx_http_request_t *r; + + r = p->request; + p->upstream.peers = p->lcf->peers; p->upstream.tries = p->lcf->peers->number; @@ -212,29 +280,28 @@ static int ngx_http_proxy_handler(ngx_ht sizeof(ngx_http_proxy_state_t), NGX_HTTP_INTERNAL_SERVER_ERROR); - p->request = r; p->method = r->method; - /* TODO: we currently support reverse proxy only */ - p->accel = 1; + /* STUB */ p->cachable = p->lcf->cache; if (r->headers_in.content_length_n > 0) { - ngx_test_null(r->temp_file, - ngx_pcalloc(r->pool, sizeof(ngx_temp_file_t)), - NGX_HTTP_INTERNAL_SERVER_ERROR); + if (!(r->temp_file = ngx_pcalloc(r->pool, sizeof(ngx_temp_file_t)))) { + return NGX_HTTP_INTERNAL_SERVER_ERROR; + } r->temp_file->file.fd = NGX_INVALID_FILE; r->temp_file->file.log = r->connection->log; - r->temp_file->path = *p->lcf->temp_path; + r->temp_file->path = p->lcf->temp_path; r->temp_file->pool = r->pool; r->temp_file->warn = "a client request body is buffered " "to a temporary file"; - /* STUB */ r->temp_file->persistent = 1; + /* r->temp_file->persistent = 0; */ r->request_body_handler = ngx_http_proxy_init_request; r->data = p; - /* TODO: we ignore return value of ngx_http_read_client_request_body */ + /* TODO: we ignore return value of ngx_http_read_client_request_body, + probably we should not return anything */ ngx_http_read_client_request_body(r, p->lcf->request_buffer_size); return NGX_DONE; @@ -255,7 +322,6 @@ static void ngx_http_proxy_init_request( ngx_output_chain_ctx_t *octx; ngx_chain_writer_ctx_t *wctx; - r = p->request; ngx_log_debug(r->connection->log, "timer_set: %d" _ @@ -283,40 +349,27 @@ ngx_log_debug(r->connection->log, "timer r->connection->log->handler = ngx_http_proxy_log_error; p->action = "connecting to upstream"; - octx = ngx_pcalloc(r->pool, sizeof(ngx_output_chain_ctx_t)); - if (octx == NULL) { + if (!(octx = ngx_pcalloc(r->pool, sizeof(ngx_output_chain_ctx_t)))) { ngx_http_proxy_finalize_request(p, NGX_HTTP_INTERNAL_SERVER_ERROR); return; } p->output_chain_ctx = octx; - - if (r->request_body_hunk) { - octx->free = ngx_alloc_chain_link(r->pool); - if (octx->free == NULL) { - ngx_http_proxy_finalize_request(p, NGX_HTTP_INTERNAL_SERVER_ERROR); - } - octx->free->hunk = r->request_body_hunk; - octx->free->next = NULL; - } - octx->sendfile = r->sendfile; octx->pool = r->pool; octx->bufs.num = 1; octx->tag = (ngx_hunk_tag_t) &ngx_http_proxy_module; octx->output_filter = (ngx_output_chain_filter_pt) ngx_chain_writer; - wctx = ngx_pcalloc(r->pool, sizeof(ngx_chain_writer_ctx_t)); - if (wctx == NULL) { + if (!(wctx = ngx_palloc(r->pool, sizeof(ngx_chain_writer_ctx_t)))) { ngx_http_proxy_finalize_request(p, NGX_HTTP_INTERNAL_SERVER_ERROR); return; } octx->output_ctx = wctx; wctx->pool = r->pool; - wctx->last = &wctx->out; - ngx_http_proxy_send_request(p); + ngx_http_proxy_connect(p); } @@ -441,106 +494,135 @@ static void ngx_http_proxy_send_request_ c = wev->data; p = c->data; - p->action = "sending request to upstream"; - if (wev->timedout) { - p->timedout = 1; + p->action = "sending request to upstream"; ngx_http_proxy_next_upstream(p, NGX_HTTP_PROXY_FT_TIMEOUT); return; } ngx_http_proxy_send_request(p); +} - return; + +static void ngx_http_proxy_dummy_handler(ngx_event_t *wev) +{ + ngx_log_debug(wev->log, "dummy handler"); } -#if 0 - -static int ngx_http_proxy_connect(ngx_http_proxy_ctx_t *p) +static void ngx_http_proxy_connect(ngx_http_proxy_ctx_t *p) { - int rc; - ngx_chain_t *cl; - ngx_connection_t *c; + int rc; + ngx_chain_t *cl; + ngx_connection_t *c; + ngx_http_request_t *r; + ngx_output_chain_ctx_t *octx; + + p->action = "connecting to upstream"; + + rc = ngx_event_connect_peer(&p->upstream); + + if (rc == NGX_ERROR) { + ngx_http_proxy_finalize_request(p, NGX_HTTP_INTERNAL_SERVER_ERROR); + return; + } + + if (rc == NGX_CONNECT_ERROR) { + ngx_http_proxy_next_upstream(p, NGX_HTTP_PROXY_FT_ERROR); + return; + } - for ( ;; ) { - p->action = "connecting to upstream"; + p->upstream.connection->data = p; + p->upstream.connection->write->event_handler = + ngx_http_proxy_send_request_handler; + p->upstream.connection->read->event_handler = + ngx_http_proxy_process_upstream_status_line; + + r = p->request; + c = p->upstream.connection; + c->pool = r->pool; + c->read->log = c->write->log = c->log = r->connection->log; - rc = ngx_event_connect_peer(&p->upstream); + octx = p->output_chain_ctx; + + if (p->upstream.tries > 1 && p->request_sent) { + ngx_http_proxy_reinit_upstream(p); + } - if (rc == NGX_ERROR) { + /* init or reinit ngx_output_chain() context */ + + if (r->request_body_hunk) { + if (!(octx->free = ngx_alloc_chain_link(r->pool))) { ngx_http_proxy_finalize_request(p, NGX_HTTP_INTERNAL_SERVER_ERROR); - return NGX_DONE; + return; } - if (rc == NGX_CONNECT_ERROR) { - ngx_event_connect_peer_failed(&p->upstream); - - if (ngx_http_proxy_log_state(p, NGX_HTTP_BAD_GATEWAY) == NGX_ERROR) - { - ngx_http_proxy_finalize_request(p, - NGX_HTTP_INTERNAL_SERVER_ERROR); - return NGX_DONE; - } + octx->free->hunk = r->request_body_hunk; + octx->free->next = NULL; + octx->hunks = 1; - if (p->upstream.tries == 0) { - ngx_http_proxy_finalize_request(p, NGX_HTTP_BAD_GATEWAY); - return NGX_DONE; - } + r->request_body_hunk->pos = r->request_body_hunk->start; + r->request_body_hunk->last = r->request_body_hunk->start; + } - continue; - } - - p->upstream.connection->data = p; - p->upstream.connection->write->event_handler = - ngx_http_proxy_send_request_handler; - p->upstream.connection->read->event_handler = - ngx_http_proxy_process_upstream_status_line; + p->request_sent = 0; - c = p->upstream.connection; - c->pool = p->request->pool; - c->read->log = c->write->log = c->log = p->request->connection->log; - - if (p->upstream.tries > 1 && p->request_sent) { + if (rc == NGX_AGAIN) { + ngx_add_timer(c->write, p->lcf->connect_timeout); + return; + } - /* reinit the request chain */ + /* rc == NGX_OK */ - for (cl = p->request->request_hunks; cl; cl = cl->next) { - cl->hunk->pos = cl->hunk->start; - } - } +#if 1 /* test only */ - p->request_sent = 0; - p->timedout = 0; - - if (rc == NGX_OK) { - return ngx_http_proxy_send_request0(p); - } + if (c->read->ready) { + /* post aio operation */ + ngx_http_proxy_process_upstream_status_line(c->read); + return; + } +#endif - /* rc == NGX_AGAIN */ - - ngx_add_timer(c->write, p->lcf->connect_timeout); - - return NGX_AGAIN; - } + ngx_http_proxy_send_request(p); } -static int ngx_http_proxy_send_request0(ngx_http_proxy_ctx_t *p) +static void ngx_http_proxy_send_request(ngx_http_proxy_ctx_t *p) { + int rc; ngx_connection_t *c; ngx_chain_writer_ctx_t *wctx; c = p->upstream.connection; +#if (HAVE_KQUEUE) + + if ((ngx_event_flags & NGX_HAVE_KQUEUE_EVENT) + && !p->request_sent + && c->write->kq_eof) + { + ngx_log_error(NGX_LOG_ERR, c->log, c->write->kq_errno, + "connect() failed"); + + ngx_http_proxy_next_upstream(p, NGX_HTTP_PROXY_FT_ERROR); + return; + } + +#endif + p->action = "sending request to upstream"; + wctx = p->output_chain_ctx->output_ctx; + wctx->out = NULL; + wctx->last = &wctx->out; wctx->connection = c; + rc = ngx_output_chain(p->output_chain_ctx, - !p->request_sent ? p->request->request_hunks: - NULL); + p->request_sent ? NULL : p->request->request_hunks); + if (rc == NGX_ERROR) { - return ngx_http_proxy_next_upstream(p, NGX_HTTP_PROXY_FT_ERROR); + ngx_http_proxy_next_upstream(p, NGX_HTTP_PROXY_FT_ERROR); + return; } p->request_sent = 1; @@ -558,188 +640,45 @@ static int ngx_http_proxy_send_request0( return; } - return NGX_AGAIN; + return; } /* rc == NGX_OK */ - if (c->read->ready) { - /* post aio operation */ - ngx_http_proxy_process_upstream_status_line(c->read); - } - - if (ngx_handle_level_write_event(c->write) == NGX_ERROR) { - ngx_http_proxy_finalize_request(p, - NGX_HTTP_INTERNAL_SERVER_ERROR); - return; - } - - if (c->tcp_nopush) { - if (ngx_tcp_push(c->fd) == NGX_ERROR) { - ngx_log_error(NGX_LOG_CRIT, c->log, - ngx_socket_errno, - ngx_tcp_push_n " failed"); - ngx_http_proxy_finalize_request(p, - NGX_HTTP_INTERNAL_SERVER_ERROR); - return; - } - - c->tcp_nopush = 0; - } + if (c->tcp_nopush) { + if (ngx_tcp_push(c->fd) == NGX_ERROR) { + ngx_log_error(NGX_LOG_CRIT, c->log, + ngx_socket_errno, + ngx_tcp_push_n " failed"); + ngx_http_proxy_finalize_request(p, NGX_HTTP_INTERNAL_SERVER_ERROR); + return; } + c->tcp_nopush = 0; return; } - ngx_http_proxy_next_upstream(p, NGX_HTTP_PROXY_FT_ERROR); +#if 0 + if (c->read->ready) { + + /* post aio operation */ - return NGX_OK; -} + /* + * although we can post aio operation just in the end + * of ngx_http_proxy_connect() CHECK IT !!! + * it's better to do here because we postpone header buffer allocation + */ - + ngx_http_proxy_process_upstream_status_line(c->read); + return; + } #endif - -static void ngx_http_proxy_send_request(ngx_http_proxy_ctx_t *p) -{ - int rc; - ngx_chain_t *cl; - ngx_connection_t *c; - ngx_chain_writer_ctx_t *wctx; - - c = p->upstream.connection; - - for ( ;; ) { - - if (c) { - p->action = "sending request to upstream"; - wctx = p->output_chain_ctx->output_ctx; - wctx->connection = c; - rc = ngx_output_chain(p->output_chain_ctx, - !p->request_sent ? p->request->request_hunks: - NULL); - - if (rc != NGX_ERROR) { - p->request_sent = 1; - - if (c->write->timer_set) { - ngx_del_timer(c->write); - } - - if (rc == NGX_AGAIN) { - ngx_add_timer(c->write, p->lcf->send_timeout); - - if (ngx_handle_write_event(c->write, /* STUB: lowat */ 0) - == NGX_ERROR) - { - ngx_http_proxy_finalize_request(p, - NGX_HTTP_INTERNAL_SERVER_ERROR); - return; - } - - } else { - - /* rc == NGX_OK */ - - if (c->read->ready) { - /* post aio operation */ - ngx_http_proxy_process_upstream_status_line(c->read); - } - - if (ngx_handle_level_write_event(c->write) == NGX_ERROR) { - ngx_http_proxy_finalize_request(p, - NGX_HTTP_INTERNAL_SERVER_ERROR); - return; - } - - if (c->tcp_nopush) { - if (ngx_tcp_push(c->fd) == NGX_ERROR) { - ngx_log_error(NGX_LOG_CRIT, c->log, - ngx_socket_errno, - ngx_tcp_push_n " failed"); - ngx_http_proxy_finalize_request(p, - NGX_HTTP_INTERNAL_SERVER_ERROR); - return; - } - c->tcp_nopush = 0; - } - } - - return; - } + p->upstream.connection->write->event_handler = ngx_http_proxy_dummy_handler; - ngx_event_connect_peer_failed(&p->upstream); - ngx_http_proxy_close_connection(c); - - if (p->upstream.tries == 0 - || !(p->lcf->next_upstream & NGX_HTTP_PROXY_FT_ERROR)) - { - ngx_http_proxy_finalize_request(p, - p->timedout ? NGX_HTTP_GATEWAY_TIME_OUT: - NGX_HTTP_BAD_GATEWAY); - return; - } - - if (!p->fatal_error) { - ngx_http_proxy_send_request(p); - return; - } - } - - for ( ;; ) { - p->action = "connecting to upstream"; - - rc = ngx_event_connect_peer(&p->upstream); - - if (rc == NGX_ERROR) { - ngx_http_proxy_finalize_request(p, - NGX_HTTP_INTERNAL_SERVER_ERROR); - return; - } - - if (rc == NGX_CONNECT_ERROR) { - ngx_event_connect_peer_failed(&p->upstream); - - if (p->upstream.tries == 0) { - ngx_http_proxy_finalize_request(p, NGX_HTTP_BAD_GATEWAY); - return; - } - - continue; - } - - p->upstream.connection->data = p; - p->upstream.connection->write->event_handler = - ngx_http_proxy_send_request_handler; - p->upstream.connection->read->event_handler = - ngx_http_proxy_process_upstream_status_line; - - c = p->upstream.connection; - c->pool = p->request->pool; - c->read->log = c->write->log = c->log = p->request->connection->log; - - if (p->upstream.tries > 1 && p->request_sent) { - - /* reinit the request chain */ - - for (cl = p->request->request_hunks; cl; cl = cl->next) { - cl->hunk->pos = cl->hunk->start; - } - } - - p->request_sent = 0; - p->timedout = 0; - - if (rc == NGX_OK) { - break; - } - - /* rc == NGX_AGAIN */ - - ngx_add_timer(c->write, p->lcf->connect_timeout); - - return; - } + if (ngx_handle_level_write_event(c->write) == NGX_ERROR) { + ngx_http_proxy_finalize_request(p, NGX_HTTP_INTERNAL_SERVER_ERROR); + return; } } @@ -753,13 +692,11 @@ static void ngx_http_proxy_process_upstr c = rev->data; p = c->data; - p->action = "reading upstream status line"; ngx_log_debug(rev->log, "http proxy process status line"); if (rev->timedout) { - p->timedout = 1; ngx_http_proxy_next_upstream(p, NGX_HTTP_PROXY_FT_TIMEOUT); return; } @@ -772,18 +709,30 @@ static void ngx_http_proxy_process_upstr return; } p->header_in->tag = (ngx_hunk_tag_t) &ngx_http_proxy_module; + + if (p->cache) { + p->header_in->pos += p->cache->ctx.header.size; + p->header_in->last = p->header_in->pos; + } } n = ngx_http_proxy_read_upstream_header(p); - if (n == NGX_ERROR) { + if (n == NGX_AGAIN) { + return; + } + + if (n == 0) { + ngx_log_error(NGX_LOG_ERR, rev->log, 0, + "upstream prematurely closed connection"); + } + + if (n == NGX_ERROR || n == 0) { ngx_http_proxy_next_upstream(p, NGX_HTTP_PROXY_FT_ERROR); return; } - if (n == NGX_AGAIN) { - return; - } + p->upstream.cached = 0; rc = ngx_http_proxy_parse_status_line(p); @@ -791,9 +740,8 @@ static void ngx_http_proxy_process_upstr if (p->header_in->pos == p->header_in->last) { ngx_log_error(NGX_LOG_ERR, rev->log, 0, "upstream sent too long status line"); - ngx_http_proxy_next_upstream(p, NGX_HTTP_PROXY_FT_HTTP_HEADER); + ngx_http_proxy_next_upstream(p, NGX_HTTP_PROXY_FT_INVALID_HEADER); } - return; } @@ -802,7 +750,7 @@ static void ngx_http_proxy_process_upstr "upstream sent no valid HTTP/1.0 header"); if (p->accel) { - ngx_http_proxy_next_upstream(p, NGX_HTTP_PROXY_FT_HTTP_HEADER); + ngx_http_proxy_next_upstream(p, NGX_HTTP_PROXY_FT_INVALID_HEADER); } else { p->request->http_version = NGX_HTTP_VERSION_9; @@ -815,12 +763,25 @@ static void ngx_http_proxy_process_upstr /* rc == NGX_OK */ - if (p->status == NGX_HTTP_INTERNAL_SERVER_ERROR - && p->upstream.tries > 1 - && (p->lcf->next_upstream & NGX_HTTP_PROXY_FT_HTTP_500)) - { - ngx_http_proxy_next_upstream(p, NGX_HTTP_PROXY_FT_HTTP_500); - return; + if (p->status == NGX_HTTP_INTERNAL_SERVER_ERROR) { + + if (p->upstream.tries > 1 + && (p->lcf->next_upstream & NGX_HTTP_PROXY_FT_HTTP_500)) + { + ngx_http_proxy_next_upstream(p, NGX_HTTP_PROXY_FT_HTTP_500); + return; + } + + if (p->upstream.tries == 0 + && p->stale + && (p->lcf->use_stale & NGX_HTTP_PROXY_FT_HTTP_500)) + { + /* + * TODO: use stale cached response if it exists and enabled + */ + + return; + } } p->status_line.len = p->status_end - p->status_start; @@ -842,8 +803,6 @@ static void ngx_http_proxy_process_upstr c->read->event_handler = ngx_http_proxy_process_upstream_headers; ngx_http_proxy_process_upstream_headers(rev); - - return; } @@ -859,13 +818,11 @@ static void ngx_http_proxy_process_upstr c = rev->data; p = c->data; r = p->request; - p->action = "reading upstream headers"; ngx_log_debug(rev->log, "http proxy process header line"); if (rev->timedout) { - p->timedout = 1; ngx_http_proxy_next_upstream(p, NGX_HTTP_PROXY_FT_TIMEOUT); return; } @@ -876,7 +833,12 @@ static void ngx_http_proxy_process_upstr if (rc == NGX_AGAIN) { n = ngx_http_proxy_read_upstream_header(p); - if (n == NGX_ERROR) { + if (n == 0) { + ngx_log_error(NGX_LOG_ERR, rev->log, 0, + "upstream prematurely closed connection"); + } + + if (n == NGX_ERROR || n == 0) { ngx_http_proxy_next_upstream(p, NGX_HTTP_PROXY_FT_ERROR); return; } @@ -892,7 +854,8 @@ static void ngx_http_proxy_process_upstr /* a header line has been parsed successfully */ - if (!(h = ngx_http_add_header(&p->headers_in, headers_in))) { + h = ngx_http_add_header(&p->headers_in, ngx_http_proxy_headers_in); + if (h == NULL) { ngx_http_proxy_finalize_request(p, NGX_HTTP_INTERNAL_SERVER_ERROR); return; @@ -913,14 +876,16 @@ static void ngx_http_proxy_process_upstr ngx_cpystrn(h->key.data, r->header_name_start, h->key.len + 1); ngx_cpystrn(h->value.data, r->header_start, h->value.len + 1); - for (i = 0; headers_in[i].name.len != 0; i++) { - if (headers_in[i].name.len != h->key.len) { + for (i = 0; ngx_http_proxy_headers_in[i].name.len != 0; i++) { + if (ngx_http_proxy_headers_in[i].name.len != h->key.len) { continue; } - if (ngx_strcasecmp(headers_in[i].name.data, h->key.data) == 0) { - *((ngx_table_elt_t **) - ((char *) &p->headers_in + headers_in[i].offset)) = h; + if (ngx_strcasecmp(ngx_http_proxy_headers_in[i].name.data, + h->key.data) == 0) + { + *((ngx_table_elt_t **) ((char *) &p->headers_in + + ngx_http_proxy_headers_in[i].offset)) = h; break; } } @@ -937,7 +902,6 @@ static void ngx_http_proxy_process_upstr ngx_log_debug(c->log, "HTTP header done"); ngx_http_proxy_send_response(p); - return; } else if (rc != NGX_AGAIN) { @@ -947,7 +911,7 @@ static void ngx_http_proxy_process_upstr ngx_log_error(NGX_LOG_ERR, rev->log, 0, upstream_header_errors[rc - NGX_HTTP_PARSE_HEADER_ERROR]); - ngx_http_proxy_next_upstream(p, NGX_HTTP_PROXY_FT_HTTP_HEADER); + ngx_http_proxy_next_upstream(p, NGX_HTTP_PROXY_FT_INVALID_HEADER); return; } @@ -957,7 +921,7 @@ static void ngx_http_proxy_process_upstr ngx_log_error(NGX_LOG_ERR, rev->log, 0, "upstream sent too big header"); - ngx_http_proxy_next_upstream(p, NGX_HTTP_PROXY_FT_HTTP_HEADER); + ngx_http_proxy_next_upstream(p, NGX_HTTP_PROXY_FT_INVALID_HEADER); return; } } @@ -1008,86 +972,44 @@ static ssize_t ngx_http_proxy_read_upstr static void ngx_http_proxy_send_response(ngx_http_proxy_ctx_t *p) { - int rc, i; - ngx_table_elt_t *ho, *h; - ngx_event_pipe_t *ep; - ngx_http_request_t *r; - ngx_http_core_loc_conf_t *clcf; + int rc, i; + ngx_table_elt_t *ho, *h; + ngx_event_pipe_t *ep; + ngx_http_request_t *r; + ngx_http_bin_cache_t *header; + ngx_http_core_loc_conf_t *clcf; r = p->request; r->headers_out.status = p->status; +#if 0 r->headers_out.content_length_n = -1; r->headers_out.content_length = NULL; +#endif /* copy an upstream header to r->headers_out */ - h = p->headers_in.headers->elts; - for (i = 0; i < p->headers_in.headers->nelts; i++) { - - if (&h[i] == p->headers_in.connection) { - continue; - } - - if (p->accel) { - if (&h[i] == p->headers_in.date - || &h[i] == p->headers_in.accept_ranges) { - continue; - } - - if (&h[i] == p->headers_in.server && !p->lcf->pass_server) { - continue; - } - } - - if (&h[i] == p->headers_in.content_type) { - r->headers_out.content_type = &h[i]; - r->headers_out.content_type->key.len = 0; - continue; - } - - if (!(ho = ngx_http_add_header(&r->headers_out, ngx_http_headers_out))) - { - ngx_http_proxy_finalize_request(p, NGX_HTTP_INTERNAL_SERVER_ERROR); - return; - } - - *ho = h[i]; - - /* - * ngx_http_header_filter() output the following headers - * from r->headers_out.headers if they are set: - * r->headers_out.server, - * r->headers_out.date, - * r->headers_out.content_length - */ - - if (&h[i] == p->headers_in.server) { - r->headers_out.server = ho; - continue; - } - - if (&h[i] == p->headers_in.date) { - r->headers_out.date = ho; - continue; - } - - if (&h[i] == p->headers_in.content_length) { - r->headers_out.content_length = ho; - r->headers_out.content_length_n = ngx_atoi(ho->value.data, - ho->value.len); - continue; - } + if (ngx_http_proxy_copy_header(p, &p->headers_in) == NGX_ERROR) { + ngx_http_proxy_finalize_request(p, NGX_HTTP_INTERNAL_SERVER_ERROR); + return; } - /* TODO: preallocate event_pipe hunks, look "Content-Length" */ rc = ngx_http_send_header(r); p->header_sent = 1; + if (p->cache) { + header = (ngx_http_bin_cache_t *) p->header_in->start; + header->type = 0x42424242; /* "BBBB" */ + header->header.length = r->headers_out.content_length_n; + header->key_len = p->cache->ctx.key.len; + ngx_memcpy(&header->key, p->cache->ctx.key.data, header->key_len); + header->key[header->key_len] = LF; + } + ep = ngx_pcalloc(r->pool, sizeof(ngx_event_pipe_t)); if (ep == NULL) { ngx_http_proxy_finalize_request(p, 0); @@ -1105,21 +1027,21 @@ static void ngx_http_proxy_send_response ep->downstream = r->connection; ep->pool = r->pool; ep->log = r->connection->log; - ep->temp_path = p->lcf->temp_path; - ep->temp_file = ngx_pcalloc(r->pool, sizeof(ngx_file_t)); - if (ep->temp_file == NULL) { + if (!(ep->temp_file = ngx_pcalloc(r->pool, sizeof(ngx_temp_file_t)))) { ngx_http_proxy_finalize_request(p, 0); return; } - ep->temp_file->fd = NGX_INVALID_FILE; - ep->temp_file->log = r->connection->log; + ep->temp_file->file.fd = NGX_INVALID_FILE; + ep->temp_file->file.log = r->connection->log; + ep->temp_file->path = p->lcf->temp_path; + ep->temp_file->pool = r->pool; + ep->temp_file->warn = "an upstream response is buffered " + "to a temporary file"; ep->max_temp_file_size = p->lcf->max_temp_file_size; ep->temp_file_write_size = p->lcf->temp_file_write_size; - ep->temp_file_warn = "an upstream response is buffered " - "to a temporary file"; ep->preread_hunks = ngx_alloc_chain_link(r->pool); if (ep->preread_hunks == NULL) { @@ -1128,6 +1050,7 @@ static void ngx_http_proxy_send_response } ep->preread_hunks->hunk = p->header_in; ep->preread_hunks->next = NULL; + p->header_in->type |= NGX_HUNK_PREREAD; ep->preread_size = p->header_in->last - p->header_in->pos; @@ -1146,7 +1069,7 @@ static void ngx_http_proxy_send_response */ p->header_in->last = p->header_in->pos; - /* STUB */ ep->cachable = 0; + ep->cachable = p->cachable; if (p->lcf->cyclic_temp_file) { @@ -1226,10 +1149,19 @@ static void ngx_http_proxy_process_body( if (p->upstream.connection) { if (ep->upstream_done) { - /* TODO: update cache */ + if (ngx_http_proxy_update_cache(p) == NGX_ERROR) { + ngx_http_proxy_finalize_request(p, 0); + return; + } } else if (ep->upstream_eof) { + /* TODO: check length & update cache */ + + if (ngx_http_proxy_update_cache(p) == NGX_ERROR) { + ngx_http_proxy_finalize_request(p, 0); + return; + } } if (ep->upstream_done || ep->upstream_eof || ep->upstream_error) { @@ -1259,202 +1191,14 @@ static void ngx_http_proxy_process_body( } -static int ngx_http_proxy_parse_status_line(ngx_http_proxy_ctx_t *p) +static int ngx_http_proxy_update_cache(ngx_http_proxy_ctx_t *p) { - char ch; - char *pos; - enum { - sw_start = 0, - sw_H, - sw_HT, - sw_HTT, - sw_HTTP, - sw_first_major_digit, - sw_major_digit, - sw_first_minor_digit, - sw_minor_digit, - sw_status, - sw_space_after_status, - sw_status_text, - sw_almost_done, - sw_done - } state; - - state = p->state; - pos = p->header_in->pos; - - while (pos < p->header_in->last && state < sw_done) { - ch = *pos++; - - switch (state) { - - /* "HTTP/" */ - case sw_start: - switch (ch) { - case 'H': - state = sw_H; - break; - default: - return NGX_HTTP_PROXY_PARSE_NO_HEADER; - } - break; - - case sw_H: - switch (ch) { - case 'T': - state = sw_HT; - break; - default: - return NGX_HTTP_PROXY_PARSE_NO_HEADER; - } - break; - - case sw_HT: - switch (ch) { - case 'T': - state = sw_HTT; - break; - default: - return NGX_HTTP_PROXY_PARSE_NO_HEADER; - } - break; - - case sw_HTT: - switch (ch) { - case 'P': - state = sw_HTTP; - break; - default: - return NGX_HTTP_PROXY_PARSE_NO_HEADER; - } - break; - - case sw_HTTP: - switch (ch) { - case '/': - state = sw_first_major_digit; - break; - default: - return NGX_HTTP_PROXY_PARSE_NO_HEADER; - } - break; - - /* the first digit of major HTTP version */ - case sw_first_major_digit: - if (ch < '1' || ch > '9') { - return NGX_HTTP_PROXY_PARSE_NO_HEADER; - } - - state = sw_major_digit; - break; - - /* the major HTTP version or dot */ - case sw_major_digit: - if (ch == '.') { - state = sw_first_minor_digit; - break; - } - - if (ch < '0' || ch > '9') { - return NGX_HTTP_PROXY_PARSE_NO_HEADER; - } - - break; - - /* the first digit of minor HTTP version */ - case sw_first_minor_digit: - if (ch < '0' || ch > '9') { - return NGX_HTTP_PROXY_PARSE_NO_HEADER; - } - - state = sw_minor_digit; - break; - - /* the minor HTTP version or the end of the request line */ - case sw_minor_digit: - if (ch == ' ') { - state = sw_status; - break; - } - - if (ch < '0' || ch > '9') { - return NGX_HTTP_PROXY_PARSE_NO_HEADER; - } - - break; - - /* HTTP status code */ - case sw_status: - if (ch < '0' || ch > '9') { - return NGX_HTTP_PROXY_PARSE_NO_HEADER; - } - - p->status = p->status * 10 + ch - '0'; - - if (++p->status_count == 3) { - state = sw_space_after_status; - p->status_start = pos - 3; - } - - break; - - /* space or end of line */ - case sw_space_after_status: - switch (ch) { - case ' ': - state = sw_status_text; - break; - case CR: - state = sw_almost_done; - break; - case LF: - state = sw_done; - break; - default: - return NGX_HTTP_PROXY_PARSE_NO_HEADER; - } - break; - - /* any text until end of line */ - case sw_status_text: - switch (ch) { - case CR: - state = sw_almost_done; - - break; - case LF: - state = sw_done; - break; - } - break; - - /* end of request line */ - case sw_almost_done: - p->status_end = pos - 2; - switch (ch) { - case LF: - state = sw_done; - break; - default: - return NGX_HTTP_PROXY_PARSE_NO_HEADER; - } - break; - } - } - - p->header_in->pos = pos; - - if (state == sw_done) { - if (p->status_end == NULL) { - p->status_end = pos - 1; - } - - p->state = sw_start; + if (p->cache == NULL) { return NGX_OK; } - p->state = state; - return NGX_AGAIN; + return ngx_http_cache_update_file(p->request, &p->cache->ctx, + &p->event_pipe->temp_file->file.name); } @@ -1462,43 +1206,69 @@ static void ngx_http_proxy_next_upstream { int status; - ngx_event_connect_peer_failed(&p->upstream); +ngx_log_debug(p->request->connection->log, "next upstream: %d" _ ft_type); - if (p->timedout) { + if (ft_type != NGX_HTTP_PROXY_FT_HTTP_404) { + ngx_event_connect_peer_failed(&p->upstream); + } + + if (ft_type == NGX_HTTP_PROXY_FT_TIMEOUT) { ngx_log_error(NGX_LOG_ERR, p->request->connection->log, NGX_ETIMEDOUT, "upstream timed out"); } + if (p->upstream.cached && ft_type == NGX_HTTP_PROXY_FT_ERROR) { + status = 0; + + } else { + switch(ft_type) { + case NGX_HTTP_PROXY_FT_TIMEOUT: + status = NGX_HTTP_GATEWAY_TIME_OUT; + break; + + case NGX_HTTP_PROXY_FT_HTTP_500: + status = NGX_HTTP_INTERNAL_SERVER_ERROR; + break; + + case NGX_HTTP_PROXY_FT_HTTP_404: + status = NGX_HTTP_NOT_FOUND; + break; + + /* + * NGX_HTTP_PROXY_FT_BUSY_LOCK and NGX_HTTP_PROXY_FT_MAX_WAITING + * never reach here + */ + + default: + status = NGX_HTTP_BAD_GATEWAY; + } + } + if (p->upstream.connection) { ngx_http_proxy_close_connection(p->upstream.connection); p->upstream.connection = NULL; } - if (ft_type == NGX_HTTP_PROXY_FT_TIMEOUT) { - status = NGX_HTTP_GATEWAY_TIME_OUT; + if (status) { + if (ngx_http_proxy_log_state(p, status) == NGX_ERROR) { + ngx_http_proxy_finalize_request(p, NGX_HTTP_INTERNAL_SERVER_ERROR); + return; + } + + if (p->upstream.tries == 0 || !(p->lcf->next_upstream & ft_type)) { - } else { - status = NGX_HTTP_BAD_GATEWAY; - } + if (p->stale && (p->lcf->use_stale & ft_type)) { + /* + * TODO: use stale cached response if it exists and enabled + */ + } - if (ngx_http_proxy_log_state(p, status) == NGX_ERROR) { - ngx_http_proxy_finalize_request(p, NGX_HTTP_INTERNAL_SERVER_ERROR); - return; + ngx_http_proxy_finalize_request(p, status); + return; + } } - if (p->upstream.tries == 0 || !(p->lcf->next_upstream & ft_type)) { - ngx_http_proxy_finalize_request(p, status); - return; - } - - if (!p->fatal_error) { - ngx_http_proxy_send_request(p); - return; - } - -ngx_log_debug(p->request->connection->log, "FATAL ERROR IN NEXT UPSTREAM"); - - return; + ngx_http_proxy_connect(p); } @@ -1538,16 +1308,12 @@ static void ngx_http_proxy_finalize_requ p->request->connection->log->handler = p->saved_handler; ngx_http_finalize_request(p->request, rc); - - p->fatal_error = 1; - - return; } static void ngx_http_proxy_close_connection(ngx_connection_t *c) { - ngx_log_debug(c->log, "close connection: %d" _ c->fd); + ngx_log_debug(c->log, "proxy close connection: %d" _ c->fd); if (c->fd == -1) { #if 0 @@ -1585,8 +1351,6 @@ static void ngx_http_proxy_close_connect } c->fd = -1; - - return; } @@ -1622,10 +1386,14 @@ static void *ngx_http_proxy_create_loc_c conf->path = NULL; conf->next_upstream = 0; + conf->use_stale = 0; conf->upstreams = NULL; conf->peers = NULL; + conf->cache_path = NULL; + conf->temp_path = NULL; + */ conf->request_buffer_size = NGX_CONF_UNSET; @@ -1646,6 +1414,8 @@ static void *ngx_http_proxy_create_loc_c /* "proxy_cyclic_temp_file" is disabled */ conf->cyclic_temp_file = 0; + conf->cache = NGX_CONF_UNSET; + conf->pass_server = NGX_CONF_UNSET; return conf; @@ -1681,11 +1451,21 @@ static char *ngx_http_proxy_merge_loc_co prev->temp_file_write_size, 16384); ngx_conf_merge_bitmask_value(conf->next_upstream, prev->next_upstream, - (NGX_HTTP_PROXY_FT_ERROR|NGX_HTTP_PROXY_FT_TIMEOUT)); + (NGX_CONF_BITMASK_SET + |NGX_HTTP_PROXY_FT_ERROR + |NGX_HTTP_PROXY_FT_TIMEOUT)); + + ngx_conf_merge_bitmask_value(conf->use_stale, prev->use_stale, + NGX_CONF_BITMASK_SET); + + ngx_conf_merge_path_value(conf->cache_path, prev->cache_path, + "cache", 1, 2, 0, cf->pool); ngx_conf_merge_path_value(conf->temp_path, prev->temp_path, "temp", 1, 2, 0, cf->pool); + ngx_conf_merge_value(conf->cache, prev->cache, 0); + ngx_conf_merge_value(conf->pass_server, prev->pass_server, 0); return NULL; @@ -1717,6 +1497,12 @@ static char *ngx_http_proxy_set_pass(ngx ngx_pcalloc(cf->pool, sizeof(ngx_http_proxy_upstream_t)), NGX_CONF_ERROR); + lcf->upstream->url.len = value[1].len; + if (!(lcf->upstream->url.data = ngx_palloc(cf->pool, value[1].len + 1))) { + return NGX_CONF_ERROR; + } + ngx_cpystrn(lcf->upstream->url.data, value[1].data, value[1].len + 1); + value[1].data += 7; value[1].len -= 7;