| /* | |
| * Copyright (C) Igor Sysoev | |
| */ | |
| #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 ngx_chain_t *ngx_http_proxy_create_request(ngx_http_proxy_ctx_t *p); | |
| static void ngx_http_proxy_init_upstream(ngx_http_request_t *r); | |
| static void ngx_http_proxy_reinit_upstream(ngx_http_proxy_ctx_t *p); | |
| 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_send_request_handler(ngx_event_t *wev); | |
| static void ngx_http_proxy_dummy_handler(ngx_event_t *wev); | |
| 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_downstream(ngx_http_request_t *r); | |
| static void ngx_http_proxy_process_body(ngx_event_t *ev); | |
| static void ngx_http_proxy_next_upstream(ngx_http_proxy_ctx_t *p, | |
| ngx_uint_t ft_type); | |
| static ngx_str_t http_methods[] = { | |
| ngx_string("GET "), | |
| ngx_string("HEAD "), | |
| ngx_string("POST ") | |
| }; | |
| static char *upstream_header_errors[] = { | |
| "upstream sent invalid header", | |
| "upstream sent too long header line" | |
| }; | |
| static char http_version[] = " HTTP/1.0" CRLF; | |
| static char host_header[] = "Host: "; | |
| static char x_url_header[] = "X-URL: http"; | |
| static char x_real_ip_header[] = "X-Real-IP: "; | |
| static char x_forwarded_for_header[] = "X-Forwarded-For: "; | |
| static char connection_close_header[] = "Connection: close" CRLF; | |
| int ngx_http_proxy_request_upstream(ngx_http_proxy_ctx_t *p) | |
| { | |
| int rc; | |
| ngx_http_request_t *r; | |
| ngx_http_proxy_upstream_t *u; | |
| r = p->request; | |
| u = ngx_pcalloc(r->pool, sizeof(ngx_http_proxy_upstream_t)); | |
| if (u == NULL) { | |
| return NGX_HTTP_INTERNAL_SERVER_ERROR; | |
| } | |
| p->upstream = u; | |
| u->peer.log_error = NGX_ERROR_ERR; | |
| u->peer.peers = p->lcf->peers; | |
| u->peer.tries = p->lcf->peers->number; | |
| #if (NGX_THREADS) | |
| u->peer.lock = &r->connection->lock; | |
| #endif | |
| u->method = r->method; | |
| rc = ngx_http_read_client_request_body(r, ngx_http_proxy_init_upstream); | |
| if (rc >= NGX_HTTP_SPECIAL_RESPONSE) { | |
| return rc; | |
| } | |
| return NGX_DONE; | |
| } | |
| static ngx_chain_t *ngx_http_proxy_create_request(ngx_http_proxy_ctx_t *p) | |
| { | |
| size_t len; | |
| ngx_uint_t i, escape, *index; | |
| ngx_buf_t *b; | |
| ngx_chain_t *chain; | |
| ngx_list_part_t *part; | |
| ngx_table_elt_t *header; | |
| ngx_http_request_t *r; | |
| ngx_http_variable_t *var; | |
| ngx_http_variable_value_t *value; | |
| ngx_http_core_main_conf_t *cmcf; | |
| ngx_http_proxy_upstream_conf_t *uc; | |
| r = p->request; | |
| uc = p->lcf->upstream; | |
| #if (NGX_SUPPRESS_WARN) | |
| var = NULL; | |
| index = NULL; | |
| #endif | |
| escape = 0; | |
| if (p->upstream->method) { | |
| len = http_methods[p->upstream->method - 1].len + uc->uri.len; | |
| } else { | |
| len = r->method_name.len + 1 + uc->uri.len; | |
| } | |
| if (p->lcf->pass_unparsed_uri && r->valid_unparsed_uri) { | |
| len += r->unparsed_uri.len - 1; | |
| } else { | |
| if (r->quoted_uri) { | |
| escape = 2 * ngx_escape_uri(NULL, r->uri.data + uc->location->len, | |
| r->uri.len - uc->location->len, | |
| NGX_ESCAPE_URI); | |
| } | |
| len += r->uri.len - uc->location->len + escape | |
| + sizeof("?") - 1 + r->args.len; | |
| } | |
| len += sizeof(http_version) - 1 | |
| + sizeof(connection_close_header) - 1 | |
| + sizeof(CRLF) - 1; | |
| if (p->lcf->set_x_url) { | |
| len += sizeof(x_url_header) - 1 | |
| + sizeof("s://") - 1 | |
| + r->port_text->len | |
| + r->unparsed_uri.len | |
| + sizeof(CRLF) - 1; | |
| if (r->headers_in.host) { | |
| len += r->headers_in.host_name_len; | |
| } else { | |
| len += r->server_name.len; | |
| } | |
| } | |
| if (p->lcf->preserve_host) { | |
| if (r->headers_in.host) { | |
| len += sizeof(host_header) - 1 | |
| + r->headers_in.host_name_len + sizeof(":") - 1 | |
| + uc->port_text.len + sizeof(CRLF) - 1; | |
| } else { | |
| len += sizeof(host_header) - 1 | |
| + r->server_name.len + sizeof(":") - 1 | |
| + uc->port_text.len + sizeof(CRLF) - 1; | |
| } | |
| } else { | |
| len += sizeof(host_header) - 1 + uc->host_header.len | |
| + sizeof(CRLF) - 1; | |
| } | |
| if (p->lcf->set_x_real_ip) { | |
| len += sizeof(x_real_ip_header) - 1 + INET_ADDRSTRLEN - 1 | |
| + sizeof(CRLF) - 1; | |
| } | |
| if (p->lcf->add_x_forwarded_for) { | |
| if (r->headers_in.x_forwarded_for) { | |
| len += sizeof(x_forwarded_for_header) - 1 | |
| + r->headers_in.x_forwarded_for->value.len | |
| + sizeof(", ") - 1 + INET_ADDRSTRLEN - 1 + sizeof(CRLF) - 1; | |
| } else { | |
| len += sizeof(x_forwarded_for_header) - 1 + INET_ADDRSTRLEN - 1 | |
| + sizeof(CRLF) - 1; | |
| } | |
| } | |
| if (p->lcf->x_vars) { | |
| cmcf = ngx_http_get_module_main_conf(r, ngx_http_core_module); | |
| var = cmcf->variables.elts; | |
| index = p->lcf->x_vars->elts; | |
| for (i = 0; i < p->lcf->x_vars->nelts; i++) { | |
| value = ngx_http_get_indexed_variable(r, index[i]); | |
| if (value == NULL) { | |
| continue; | |
| } | |
| if (value->text.len) { | |
| len += sizeof("X-") - 1 + var[index[i]].name.len | |
| + sizeof(": ") - 1 + value->text.len + sizeof(CRLF) - 1; | |
| } | |
| } | |
| } | |
| part = &r->headers_in.headers.part; | |
| header = part->elts; | |
| for (i = 0; /* void */; i++) { | |
| if (i >= part->nelts) { | |
| if (part->next == NULL) { | |
| break; | |
| } | |
| part = part->next; | |
| header = part->elts; | |
| i = 0; | |
| } | |
| if (&header[i] == r->headers_in.host) { | |
| continue; | |
| } | |
| if (&header[i] == r->headers_in.connection) { | |
| continue; | |
| } | |
| len += header[i].key.len + sizeof(": ") - 1 | |
| + header[i].value.len + sizeof(CRLF) - 1; | |
| } | |
| #if (NGX_DEBUG) | |
| len++; | |
| #endif | |
| b = ngx_create_temp_buf(r->pool, len); | |
| if (b == NULL) { | |
| return NULL; | |
| } | |
| chain = ngx_alloc_chain_link(r->pool); | |
| if (chain == NULL) { | |
| return NULL; | |
| } | |
| chain->buf = b; | |
| chain->next = NULL; | |
| /* the request line */ | |
| if (p->upstream->method) { | |
| b->last = ngx_cpymem(b->last, | |
| http_methods[p->upstream->method - 1].data, | |
| http_methods[p->upstream->method - 1].len); | |
| } else { | |
| b->last = ngx_cpymem(b->last, r->method_name.data, | |
| r->method_name.len + 1); | |
| } | |
| b->last = ngx_cpymem(b->last, uc->uri.data, uc->uri.len); | |
| if (p->lcf->pass_unparsed_uri && r->valid_unparsed_uri) { | |
| b->last = ngx_cpymem(b->last, r->unparsed_uri.data + 1, | |
| r->unparsed_uri.len - 1); | |
| } else { | |
| if (escape) { | |
| ngx_escape_uri(b->last, r->uri.data + uc->location->len, | |
| r->uri.len - uc->location->len, NGX_ESCAPE_URI); | |
| b->last += r->uri.len - uc->location->len + escape; | |
| } else { | |
| b->last = ngx_cpymem(b->last, r->uri.data + uc->location->len, | |
| r->uri.len - uc->location->len); | |
| } | |
| if (r->args.len > 0) { | |
| *b->last++ = '?'; | |
| b->last = ngx_cpymem(b->last, r->args.data, r->args.len); | |
| } | |
| } | |
| b->last = ngx_cpymem(b->last, http_version, sizeof(http_version) - 1); | |
| /* the "Connection: close" header */ | |
| b->last = ngx_cpymem(b->last, connection_close_header, | |
| sizeof(connection_close_header) - 1); | |
| /* the "Host" header */ | |
| b->last = ngx_cpymem(b->last, host_header, sizeof(host_header) - 1); | |
| if (p->lcf->preserve_host) { | |
| if (r->headers_in.host) { | |
| b->last = ngx_cpymem(b->last, r->headers_in.host->value.data, | |
| r->headers_in.host_name_len); | |
| } else { | |
| b->last = ngx_cpymem(b->last, r->server_name.data, | |
| r->server_name.len); | |
| } | |
| if (!uc->default_port) { | |
| *b->last++ = ':'; | |
| b->last = ngx_cpymem(b->last, uc->port_text.data, | |
| uc->port_text.len); | |
| } | |
| } else { | |
| b->last = ngx_cpymem(b->last, uc->host_header.data, | |
| uc->host_header.len); | |
| } | |
| *b->last++ = CR; *b->last++ = LF; | |
| /* the "X-URL" header */ | |
| if (p->lcf->set_x_url) { | |
| b->last = ngx_cpymem(b->last, x_url_header, | |
| sizeof(x_url_header) - 1); | |
| #if (NGX_OPENSSL) | |
| if (r->connection->ssl) { | |
| *b->last++ = 's'; | |
| } | |
| #endif | |
| *b->last++ = ':'; *b->last++ = '/'; *b->last++ = '/'; | |
| if (r->headers_in.host) { | |
| b->last = ngx_cpymem(b->last, r->headers_in.host->value.data, | |
| r->headers_in.host_name_len); | |
| } else { | |
| b->last = ngx_cpymem(b->last, r->server_name.data, | |
| r->server_name.len); | |
| } | |
| b->last = ngx_cpymem(b->last, r->port_text->data, r->port_text->len); | |
| b->last = ngx_cpymem(b->last, r->unparsed_uri.data, | |
| r->unparsed_uri.len); | |
| *b->last++ = CR; *b->last++ = LF; | |
| } | |
| /* the "X-Real-IP" header */ | |
| if (p->lcf->set_x_real_ip) { | |
| b->last = ngx_cpymem(b->last, x_real_ip_header, | |
| sizeof(x_real_ip_header) - 1); | |
| b->last = ngx_cpymem(b->last, r->connection->addr_text.data, | |
| r->connection->addr_text.len); | |
| *b->last++ = CR; *b->last++ = LF; | |
| } | |
| /* the "X-Forwarded-For" header */ | |
| if (p->lcf->add_x_forwarded_for) { | |
| if (r->headers_in.x_forwarded_for) { | |
| b->last = ngx_cpymem(b->last, x_forwarded_for_header, | |
| sizeof(x_forwarded_for_header) - 1); | |
| b->last = ngx_cpymem(b->last, | |
| r->headers_in.x_forwarded_for->value.data, | |
| r->headers_in.x_forwarded_for->value.len); | |
| *b->last++ = ','; *b->last++ = ' '; | |
| } else { | |
| b->last = ngx_cpymem(b->last, x_forwarded_for_header, | |
| sizeof(x_forwarded_for_header) - 1); | |
| } | |
| b->last = ngx_cpymem(b->last, r->connection->addr_text.data, | |
| r->connection->addr_text.len); | |
| *b->last++ = CR; *b->last++ = LF; | |
| } | |
| if (p->lcf->x_vars) { | |
| for (i = 0; i < p->lcf->x_vars->nelts; i++) { | |
| value = ngx_http_get_indexed_variable(r, index[i]); | |
| if (value == NULL) { | |
| continue; | |
| } | |
| if (value->text.len == 0) { | |
| continue; | |
| } | |
| *b->last++ = 'X'; *b->last++ = '-'; | |
| b->last = ngx_cpymem(b->last, var[index[i]].name.data, | |
| var[index[i]].name.len); | |
| *b->last++ = ':'; *b->last++ = ' '; | |
| b->last = ngx_cpymem(b->last, value->text.data, value->text.len); | |
| *b->last++ = CR; *b->last++ = LF; | |
| } | |
| } | |
| part = &r->headers_in.headers.part; | |
| header = part->elts; | |
| for (i = 0; /* void */; i++) { | |
| if (i >= part->nelts) { | |
| if (part->next == NULL) { | |
| break; | |
| } | |
| part = part->next; | |
| header = part->elts; | |
| i = 0; | |
| } | |
| if (&header[i] == r->headers_in.host) { | |
| continue; | |
| } | |
| if (&header[i] == r->headers_in.connection) { | |
| continue; | |
| } | |
| if (&header[i] == r->headers_in.keep_alive) { | |
| continue; | |
| } | |
| if (&header[i] == r->headers_in.x_forwarded_for | |
| && p->lcf->add_x_forwarded_for) | |
| { | |
| continue; | |
| } | |
| if (&header[i] == r->headers_in.x_real_ip && p->lcf->set_x_real_ip) { | |
| continue; | |
| } | |
| if (&header[i] == r->headers_in.x_url && p->lcf->set_x_url) { | |
| continue; | |
| } | |
| b->last = ngx_cpymem(b->last, header[i].key.data, header[i].key.len); | |
| *b->last++ = ':'; *b->last++ = ' '; | |
| b->last = ngx_cpymem(b->last, header[i].value.data, | |
| header[i].value.len); | |
| *b->last++ = CR; *b->last++ = LF; | |
| ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, | |
| "http proxy header: \"%V: %V\"", | |
| &header[i].key, &header[i].value); | |
| } | |
| /* add "\r\n" at the header end */ | |
| *b->last++ = CR; *b->last++ = LF; | |
| #if (NGX_DEBUG) | |
| *b->last = '\0'; | |
| ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, | |
| "http proxy header:\n\"%s\"", b->pos); | |
| #endif | |
| return chain; | |
| } | |
| static void ngx_http_proxy_init_upstream(ngx_http_request_t *r) | |
| { | |
| ngx_chain_t *cl; | |
| ngx_http_proxy_ctx_t *p; | |
| ngx_output_chain_ctx_t *output; | |
| ngx_chain_writer_ctx_t *writer; | |
| ngx_http_proxy_log_ctx_t *ctx; | |
| p = ngx_http_get_module_ctx(r, ngx_http_proxy_module); | |
| ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, | |
| "http proxy init upstream, client timer: %d", | |
| r->connection->read->timer_set); | |
| if (r->connection->read->timer_set) { | |
| ngx_del_timer(r->connection->read); | |
| } | |
| r->read_event_handler = ngx_http_proxy_rd_check_broken_connection; | |
| if (ngx_event_flags & NGX_USE_CLEAR_EVENT) { | |
| r->write_event_handler = ngx_http_proxy_wr_check_broken_connection; | |
| if (!r->connection->write->active) { | |
| if (ngx_add_event(r->connection->write, NGX_WRITE_EVENT, | |
| NGX_CLEAR_EVENT) == NGX_ERROR) | |
| { | |
| ngx_http_finalize_request(r, NGX_HTTP_INTERNAL_SERVER_ERROR); | |
| return; | |
| } | |
| } | |
| } | |
| cl = ngx_http_proxy_create_request(p); | |
| if (cl == NULL) { | |
| ngx_http_finalize_request(r, NGX_HTTP_INTERNAL_SERVER_ERROR); | |
| return; | |
| } | |
| if (r->request_body->bufs) { | |
| cl->next = r->request_body->bufs; | |
| } | |
| r->request_body->bufs = cl; | |
| ctx = ngx_pcalloc(r->pool, sizeof(ngx_http_proxy_log_ctx_t)); | |
| if (ctx == NULL) { | |
| ngx_http_proxy_finalize_request(p, NGX_HTTP_INTERNAL_SERVER_ERROR); | |
| return; | |
| } | |
| ctx->connection = r->connection->number; | |
| ctx->proxy = p; | |
| p->upstream->peer.log = r->connection->log; | |
| p->saved_ctx = r->connection->log->data; | |
| p->saved_handler = r->connection->log->handler; | |
| r->connection->log->data = ctx; | |
| r->connection->log->handler = ngx_http_proxy_log_error; | |
| p->action = "connecting to upstream"; | |
| output = ngx_pcalloc(r->pool, sizeof(ngx_output_chain_ctx_t)); | |
| if (output == NULL) { | |
| ngx_http_proxy_finalize_request(p, NGX_HTTP_INTERNAL_SERVER_ERROR); | |
| return; | |
| } | |
| p->upstream->output_chain_ctx = output; | |
| output->sendfile = r->connection->sendfile; | |
| output->pool = r->pool; | |
| output->bufs.num = 1; | |
| output->tag = (ngx_buf_tag_t) &ngx_http_proxy_module; | |
| output->output_filter = ngx_chain_writer; | |
| writer = ngx_palloc(r->pool, sizeof(ngx_chain_writer_ctx_t)); | |
| if (writer == NULL) { | |
| ngx_http_proxy_finalize_request(p, NGX_HTTP_INTERNAL_SERVER_ERROR); | |
| return; | |
| } | |
| output->filter_ctx = writer; | |
| writer->pool = r->pool; | |
| #if 0 | |
| if (p->lcf->busy_lock && p->busy_lock == NULL) { | |
| #else | |
| if (p->lcf->busy_lock && !p->busy_locked) { | |
| #endif | |
| ngx_http_proxy_upstream_busy_lock(p); | |
| } else { | |
| ngx_http_proxy_connect(p); | |
| } | |
| } | |
| static void ngx_http_proxy_reinit_upstream(ngx_http_proxy_ctx_t *p) | |
| { | |
| ngx_chain_t *cl; | |
| ngx_output_chain_ctx_t *output; | |
| ngx_http_proxy_state_e state; | |
| /* reinit the request chain */ | |
| for (cl = p->request->request_body->bufs; cl; cl = cl->next) { | |
| cl->buf->pos = cl->buf->start; | |
| cl->buf->file_pos = 0; | |
| } | |
| /* reinit the ngx_output_chain() context */ | |
| output = p->upstream->output_chain_ctx; | |
| output->buf = NULL; | |
| output->in = NULL; | |
| output->free = NULL; | |
| output->busy = NULL; | |
| /* reinit r->header_in buffer */ | |
| if (p->header_in) { | |
| if (p->cache) { | |
| p->header_in->pos = p->header_in->start + p->cache->ctx.header_size; | |
| p->header_in->last = p->header_in->pos; | |
| } else { | |
| p->header_in->pos = p->header_in->start; | |
| p->header_in->last = p->header_in->start; | |
| } | |
| } | |
| /* add one more state */ | |
| state = p->state->cache_state; | |
| p->state = ngx_array_push(&p->states); | |
| if (p->state == NULL) { | |
| ngx_http_proxy_finalize_request(p, NGX_HTTP_INTERNAL_SERVER_ERROR); | |
| return; | |
| } | |
| ngx_memzero(p->state, sizeof(ngx_http_proxy_state_t)); | |
| p->state->cache_state = state; | |
| p->status = 0; | |
| p->status_count = 0; | |
| } | |
| #if 0 | |
| void ngx_http_proxy_upstream_busy_lock(ngx_http_proxy_ctx_t *p) | |
| { | |
| ngx_int_t rc; | |
| rc = ngx_event_busy_lock(p->lcf->busy_lock, p->busy_lock); | |
| if (rc == NGX_AGAIN) { | |
| return; | |
| } | |
| if (rc == NGX_OK) { | |
| ngx_http_proxy_connect(p); | |
| return; | |
| } | |
| if (rc == NGX_ERROR) { | |
| p->state->status = NGX_HTTP_INTERNAL_SERVER_ERROR; | |
| ngx_http_proxy_finalize_request(p, NGX_HTTP_INTERNAL_SERVER_ERROR); | |
| return; | |
| } | |
| /* rc == NGX_BUSY */ | |
| #if (NGX_HTTP_CACHE) | |
| if (p->busy_lock->timer) { | |
| ft_type = NGX_HTTP_PROXY_FT_MAX_WAITING; | |
| } else { | |
| ft_type = NGX_HTTP_PROXY_FT_BUSY_LOCK; | |
| } | |
| if (p->stale && (p->lcf->use_stale & ft_type)) { | |
| ngx_http_proxy_finalize_request(p, | |
| ngx_http_proxy_send_cached_response(p)); | |
| return; | |
| } | |
| #endif | |
| p->state->status = NGX_HTTP_SERVICE_UNAVAILABLE; | |
| ngx_http_proxy_finalize_request(p, NGX_HTTP_SERVICE_UNAVAILABLE); | |
| } | |
| #endif | |
| #if 1 | |
| void ngx_http_proxy_upstream_busy_lock(ngx_http_proxy_ctx_t *p) | |
| { | |
| ngx_int_t rc; | |
| #if (NGX_HTTP_CACHE) | |
| ngx_int_t ft_type; | |
| #endif | |
| if (p->busy_lock.time == 0) { | |
| p->busy_lock.event = p->request->connection->read; | |
| p->busy_lock.event_handler = ngx_http_proxy_busy_lock_handler; | |
| } | |
| rc = ngx_http_busy_lock(p->lcf->busy_lock, &p->busy_lock); | |
| if (rc == NGX_AGAIN) { | |
| return; | |
| } | |
| if (rc == NGX_OK) { | |
| ngx_http_proxy_connect(p); | |
| return; | |
| } | |
| ngx_http_busy_unlock(p->lcf->busy_lock, &p->busy_lock); | |
| #if (NGX_HTTP_CACHE) | |
| if (rc == NGX_DONE) { | |
| ft_type = NGX_HTTP_PROXY_FT_BUSY_LOCK; | |
| } else { | |
| /* rc == NGX_ERROR */ | |
| ft_type = NGX_HTTP_PROXY_FT_MAX_WAITING; | |
| } | |
| if (p->stale && (p->lcf->use_stale & ft_type)) { | |
| ngx_http_proxy_finalize_request(p, | |
| ngx_http_proxy_send_cached_response(p)); | |
| return; | |
| } | |
| #endif | |
| p->state->status = NGX_HTTP_SERVICE_UNAVAILABLE; | |
| ngx_http_proxy_finalize_request(p, NGX_HTTP_SERVICE_UNAVAILABLE); | |
| } | |
| #endif | |
| static void ngx_http_proxy_connect(ngx_http_proxy_ctx_t *p) | |
| { | |
| ngx_int_t rc; | |
| ngx_connection_t *c; | |
| ngx_http_request_t *r; | |
| ngx_output_chain_ctx_t *output; | |
| ngx_chain_writer_ctx_t *writer; | |
| p->action = "connecting to upstream"; | |
| p->request->connection->single_connection = 0; | |
| rc = ngx_event_connect_peer(&p->upstream->peer); | |
| ngx_log_debug1(NGX_LOG_DEBUG_HTTP, p->request->connection->log, 0, | |
| "http proxy connect: %i", rc); | |
| if (rc == NGX_ERROR) { | |
| ngx_http_proxy_finalize_request(p, NGX_HTTP_INTERNAL_SERVER_ERROR); | |
| return; | |
| } | |
| p->state->peer = | |
| &p->upstream->peer.peers->peer[p->upstream->peer.cur_peer].name; | |
| if (rc == NGX_CONNECT_ERROR) { | |
| ngx_http_proxy_next_upstream(p, NGX_HTTP_PROXY_FT_ERROR); | |
| return; | |
| } | |
| r = p->request; | |
| c = p->upstream->peer.connection; | |
| c->data = p; | |
| c->write->handler = ngx_http_proxy_send_request_handler; | |
| c->read->handler = ngx_http_proxy_process_upstream_status_line; | |
| c->sendfile = r->connection->sendfile; | |
| c->pool = r->pool; | |
| c->read->log = c->write->log = c->log = r->connection->log; | |
| /* init or reinit the ngx_output_chain() and ngx_chain_writer() contexts */ | |
| output = p->upstream->output_chain_ctx; | |
| writer = output->filter_ctx; | |
| writer->out = NULL; | |
| writer->last = &writer->out; | |
| writer->connection = c; | |
| writer->limit = 0; | |
| if (p->request_sent) { | |
| ngx_http_proxy_reinit_upstream(p); | |
| } | |
| if (r->request_body->buf) { | |
| if (r->request_body->temp_file) { | |
| output->free = ngx_alloc_chain_link(r->pool); | |
| if (output->free == NULL) { | |
| ngx_http_proxy_finalize_request(p, | |
| NGX_HTTP_INTERNAL_SERVER_ERROR); | |
| return; | |
| } | |
| output->free->buf = r->request_body->buf; | |
| output->free->next = NULL; | |
| output->allocated = 1; | |
| r->request_body->buf->pos = r->request_body->buf->start; | |
| r->request_body->buf->last = r->request_body->buf->start; | |
| r->request_body->buf->tag = (ngx_buf_tag_t) &ngx_http_proxy_module; | |
| } else { | |
| r->request_body->buf->pos = r->request_body->buf->start; | |
| } | |
| } | |
| p->request_sent = 0; | |
| if (rc == NGX_AGAIN) { | |
| ngx_add_timer(c->write, p->lcf->connect_timeout); | |
| return; | |
| } | |
| /* rc == NGX_OK */ | |
| #if 0 /* test only, see below about "post aio operation" */ | |
| if (c->read->ready) { | |
| /* post aio operation */ | |
| ngx_http_proxy_process_upstream_status_line(c->read); | |
| #if 0 | |
| return; | |
| #endif | |
| } | |
| #endif | |
| ngx_http_proxy_send_request(p); | |
| } | |
| static void ngx_http_proxy_send_request(ngx_http_proxy_ctx_t *p) | |
| { | |
| int rc; | |
| ngx_connection_t *c; | |
| c = p->upstream->peer.connection; | |
| ngx_log_debug0(NGX_LOG_DEBUG_HTTP, c->log, 0, | |
| "http proxy send request"); | |
| #if (NGX_HAVE_KQUEUE) | |
| if ((ngx_event_flags & NGX_USE_KQUEUE_EVENT) | |
| && !p->request_sent | |
| && c->write->pending_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"; | |
| rc = ngx_output_chain(p->upstream->output_chain_ctx, | |
| p->request_sent ? NULL: | |
| p->request->request_body->bufs); | |
| p->request_sent = 1; | |
| if (rc == NGX_ERROR) { | |
| ngx_http_proxy_next_upstream(p, NGX_HTTP_PROXY_FT_ERROR); | |
| return; | |
| } | |
| 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, p->lcf->send_lowat) == NGX_ERROR) { | |
| ngx_http_proxy_finalize_request(p, NGX_HTTP_INTERNAL_SERVER_ERROR); | |
| return; | |
| } | |
| return; | |
| } | |
| /* rc == NGX_OK */ | |
| if (c->tcp_nopush == NGX_TCP_NOPUSH_SET) { | |
| 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 = NGX_TCP_NOPUSH_UNSET; | |
| return; | |
| } | |
| ngx_add_timer(c->read, p->lcf->read_timeout); | |
| #if 1 | |
| if (c->read->ready) { | |
| /* post aio operation */ | |
| /* | |
| * 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 | |
| c->write->handler = ngx_http_proxy_dummy_handler; | |
| if (ngx_handle_write_event(c->write, 0) == NGX_ERROR) { | |
| ngx_http_proxy_finalize_request(p, NGX_HTTP_INTERNAL_SERVER_ERROR); | |
| return; | |
| } | |
| } | |
| static void ngx_http_proxy_send_request_handler(ngx_event_t *wev) | |
| { | |
| ngx_connection_t *c; | |
| ngx_http_proxy_ctx_t *p; | |
| c = wev->data; | |
| p = c->data; | |
| ngx_log_debug0(NGX_LOG_DEBUG_HTTP, wev->log, 0, | |
| "http proxy send request handler"); | |
| if (wev->timedout) { | |
| p->action = "sending request to upstream"; | |
| ngx_http_proxy_next_upstream(p, NGX_HTTP_PROXY_FT_TIMEOUT); | |
| return; | |
| } | |
| if (p->request->connection->write->eof | |
| && (!p->cachable || !p->request_sent)) | |
| { | |
| ngx_http_proxy_finalize_request(p, NGX_HTTP_CLIENT_CLOSED_REQUEST); | |
| return; | |
| } | |
| ngx_http_proxy_send_request(p); | |
| } | |
| static void ngx_http_proxy_dummy_handler(ngx_event_t *wev) | |
| { | |
| ngx_log_debug0(NGX_LOG_DEBUG_HTTP, wev->log, 0, "http proxy dummy handler"); | |
| } | |
| static void ngx_http_proxy_process_upstream_status_line(ngx_event_t *rev) | |
| { | |
| int rc; | |
| ssize_t n; | |
| ngx_connection_t *c; | |
| ngx_http_proxy_ctx_t *p; | |
| c = rev->data; | |
| p = c->data; | |
| p->action = "reading upstream status line"; | |
| ngx_log_debug0(NGX_LOG_DEBUG_HTTP, rev->log, 0, | |
| "http proxy process status line"); | |
| if (rev->timedout) { | |
| ngx_http_proxy_next_upstream(p, NGX_HTTP_PROXY_FT_TIMEOUT); | |
| return; | |
| } | |
| if (p->header_in == NULL) { | |
| p->header_in = ngx_create_temp_buf(p->request->pool, | |
| p->lcf->header_buffer_size); | |
| if (p->header_in == NULL) { | |
| ngx_http_proxy_finalize_request(p, NGX_HTTP_INTERNAL_SERVER_ERROR); | |
| return; | |
| } | |
| p->header_in->tag = (ngx_buf_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_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; | |
| } | |
| p->valid_header_in = 0; | |
| p->upstream->peer.cached = 0; | |
| rc = ngx_http_proxy_parse_status_line(p); | |
| if (rc == NGX_AGAIN) { | |
| if (p->header_in->pos == p->header_in->end) { | |
| 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_INVALID_HEADER); | |
| } | |
| return; | |
| } | |
| if (rc == NGX_HTTP_PROXY_PARSE_NO_HEADER) { | |
| ngx_log_error(NGX_LOG_ERR, rev->log, 0, | |
| "upstream sent no valid HTTP/1.0 header"); | |
| if (p->accel) { | |
| ngx_http_proxy_next_upstream(p, NGX_HTTP_PROXY_FT_INVALID_HEADER); | |
| } else { | |
| p->request->http_version = NGX_HTTP_VERSION_9; | |
| p->upstream->status = NGX_HTTP_OK; | |
| ngx_http_proxy_send_response(p); | |
| } | |
| return; | |
| } | |
| /* rc == NGX_OK */ | |
| p->upstream->status = p->status; | |
| p->state->status = p->status; | |
| if (p->status == NGX_HTTP_INTERNAL_SERVER_ERROR) { | |
| if (p->upstream->peer.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 (NGX_HTTP_CACHE) | |
| if (p->upstream->peer.tries == 0 | |
| && p->stale | |
| && (p->lcf->use_stale & NGX_HTTP_PROXY_FT_HTTP_500)) | |
| { | |
| ngx_http_proxy_finalize_request(p, | |
| ngx_http_proxy_send_cached_response(p)); | |
| return; | |
| } | |
| #endif | |
| } | |
| if (p->status == NGX_HTTP_NOT_FOUND | |
| && p->upstream->peer.tries > 1 | |
| && p->lcf->next_upstream & NGX_HTTP_PROXY_FT_HTTP_404) | |
| { | |
| ngx_http_proxy_next_upstream(p, NGX_HTTP_PROXY_FT_HTTP_404); | |
| return; | |
| } | |
| /* TODO: "proxy_error_page" */ | |
| p->upstream->status_line.len = p->status_end - p->status_start; | |
| p->upstream->status_line.data = ngx_palloc(p->request->pool, | |
| p->upstream->status_line.len + 1); | |
| if (p->upstream->status_line.data == NULL) { | |
| ngx_http_proxy_finalize_request(p, NGX_HTTP_INTERNAL_SERVER_ERROR); | |
| return; | |
| } | |
| ngx_cpystrn(p->upstream->status_line.data, p->status_start, | |
| p->upstream->status_line.len + 1); | |
| ngx_log_debug2(NGX_LOG_DEBUG_HTTP, rev->log, 0, | |
| "http proxy status %ui \"%V\"", | |
| p->upstream->status, &p->upstream->status_line); | |
| /* init or reinit the p->upstream->headers_in.headers table */ | |
| if (p->upstream->headers_in.headers.part.elts) { | |
| p->upstream->headers_in.headers.part.nelts = 0; | |
| p->upstream->headers_in.headers.part.next = NULL; | |
| p->upstream->headers_in.headers.last = | |
| &p->upstream->headers_in.headers.part; | |
| ngx_memzero(&p->upstream->headers_in.date, | |
| sizeof(ngx_http_proxy_headers_in_t) - sizeof(ngx_list_t)); | |
| } else { | |
| if (ngx_list_init(&p->upstream->headers_in.headers, p->request->pool, | |
| 20, sizeof(ngx_table_elt_t)) == NGX_ERROR) | |
| { | |
| ngx_http_proxy_finalize_request(p, NGX_HTTP_INTERNAL_SERVER_ERROR); | |
| return; | |
| } | |
| } | |
| c->read->handler = ngx_http_proxy_process_upstream_headers; | |
| ngx_http_proxy_process_upstream_headers(rev); | |
| } | |
| static void ngx_http_proxy_process_upstream_headers(ngx_event_t *rev) | |
| { | |
| int i, rc; | |
| ssize_t n; | |
| ngx_table_elt_t *h; | |
| ngx_connection_t *c; | |
| ngx_http_request_t *r; | |
| ngx_http_proxy_ctx_t *p; | |
| c = rev->data; | |
| p = c->data; | |
| r = p->request; | |
| p->action = "reading upstream headers"; | |
| ngx_log_debug0(NGX_LOG_DEBUG_HTTP, rev->log, 0, | |
| "http proxy process header line"); | |
| if (rev->timedout) { | |
| ngx_http_proxy_next_upstream(p, NGX_HTTP_PROXY_FT_TIMEOUT); | |
| return; | |
| } | |
| rc = NGX_AGAIN; | |
| for ( ;; ) { | |
| if (rc == NGX_AGAIN) { | |
| n = ngx_http_proxy_read_upstream_header(p); | |
| 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; | |
| } | |
| } | |
| rc = ngx_http_parse_header_line(p->request, p->header_in); | |
| if (rc == NGX_OK && !r->invalid_header) { | |
| /* a header line has been parsed successfully */ | |
| h = ngx_list_push(&p->upstream->headers_in.headers); | |
| if (h == NULL) { | |
| ngx_http_proxy_finalize_request(p, | |
| NGX_HTTP_INTERNAL_SERVER_ERROR); | |
| return; | |
| } | |
| h->key.len = r->header_name_end - r->header_name_start; | |
| h->value.len = r->header_end - r->header_start; | |
| h->key.data = ngx_palloc(p->request->pool, | |
| h->key.len + 1 + h->value.len + 1); | |
| if (h->key.data == NULL) { | |
| ngx_http_proxy_finalize_request(p, | |
| NGX_HTTP_INTERNAL_SERVER_ERROR); | |
| return; | |
| } | |
| h->value.data = h->key.data + h->key.len + 1; | |
| 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; 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(ngx_http_proxy_headers_in[i].name.data, | |
| h->key.data) == 0) | |
| { | |
| *((ngx_table_elt_t **) ((char *) &p->upstream->headers_in | |
| + ngx_http_proxy_headers_in[i].offset)) = h; | |
| break; | |
| } | |
| } | |
| ngx_log_debug2(NGX_LOG_DEBUG_HTTP, c->log, 0, | |
| "http proxy header: \"%V: %V\"", &h->key, &h->value); | |
| continue; | |
| } else if (rc == NGX_HTTP_PARSE_HEADER_DONE) { | |
| /* a whole header has been parsed successfully */ | |
| ngx_log_debug0(NGX_LOG_DEBUG_HTTP, c->log, 0, | |
| "http proxy header done"); | |
| /* TODO: hook to process the upstream header */ | |
| #if (NGX_HTTP_CACHE) | |
| if (p->cachable) { | |
| p->cachable = ngx_http_proxy_is_cachable(p); | |
| } | |
| #endif | |
| ngx_http_proxy_send_response(p); | |
| return; | |
| } else if (rc != NGX_AGAIN) { | |
| if (r->invalid_header) { | |
| rc = NGX_HTTP_PARSE_INVALID_HEADER; | |
| } | |
| /* there was error while a header line parsing */ | |
| 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_INVALID_HEADER); | |
| return; | |
| } | |
| /* rc == NGX_AGAIN: a header line parsing is still not complete */ | |
| if (p->header_in->last == p->header_in->end) { | |
| ngx_log_error(NGX_LOG_ERR, rev->log, 0, | |
| "upstream sent too big header"); | |
| ngx_http_proxy_next_upstream(p, NGX_HTTP_PROXY_FT_INVALID_HEADER); | |
| return; | |
| } | |
| } | |
| } | |
| static ssize_t ngx_http_proxy_read_upstream_header(ngx_http_proxy_ctx_t *p) | |
| { | |
| ssize_t n; | |
| ngx_event_t *rev; | |
| rev = p->upstream->peer.connection->read; | |
| n = p->header_in->last - p->header_in->pos; | |
| if (n > 0) { | |
| return n; | |
| } | |
| n = ngx_recv(p->upstream->peer.connection, p->header_in->last, | |
| p->header_in->end - p->header_in->last); | |
| if (n == NGX_AGAIN) { | |
| #if 0 | |
| ngx_add_timer(rev, p->lcf->read_timeout); | |
| #endif | |
| if (ngx_handle_read_event(rev, 0) == NGX_ERROR) { | |
| ngx_http_proxy_finalize_request(p, NGX_HTTP_INTERNAL_SERVER_ERROR); | |
| return NGX_ERROR; | |
| } | |
| return NGX_AGAIN; | |
| } | |
| if (n == 0) { | |
| ngx_log_error(NGX_LOG_ERR, rev->log, 0, | |
| "upstream closed prematurely connection"); | |
| } | |
| if (n == 0 || n == NGX_ERROR) { | |
| return NGX_ERROR; | |
| } | |
| p->header_in->last += n; | |
| return n; | |
| } | |
| static void ngx_http_proxy_send_response(ngx_http_proxy_ctx_t *p) | |
| { | |
| int rc; | |
| ngx_event_pipe_t *ep; | |
| ngx_http_request_t *r; | |
| ngx_http_cache_header_t *header; | |
| ngx_http_core_loc_conf_t *clcf; | |
| r = p->request; | |
| r->headers_out.status = p->upstream->status; | |
| r->headers_out.status_line = p->upstream->status_line; | |
| #if 0 | |
| r->headers_out.content_length_n = -1; | |
| r->headers_out.content_length = NULL; | |
| #endif | |
| /* copy an upstream header to r->headers_out */ | |
| if (ngx_http_proxy_copy_header(p, &p->upstream->headers_in) == NGX_ERROR) { | |
| ngx_http_proxy_finalize_request(p, NGX_HTTP_INTERNAL_SERVER_ERROR); | |
| return; | |
| } | |
| /* TODO: preallocate event_pipe bufs, look "Content-Length" */ | |
| rc = ngx_http_send_header(r); | |
| if (rc == NGX_ERROR || rc > NGX_OK) { | |
| ngx_http_proxy_finalize_request(p, rc); | |
| return; | |
| } | |
| p->header_sent = 1; | |
| if (p->cache && p->cache->ctx.file.fd != NGX_INVALID_FILE) { | |
| if (ngx_close_file(p->cache->ctx.file.fd) == NGX_FILE_ERROR) { | |
| ngx_log_error(NGX_LOG_ALERT, r->connection->log, ngx_errno, | |
| ngx_close_file_n " \"%s\" failed", | |
| p->cache->ctx.file.name.data); | |
| } | |
| } | |
| if (p->cachable) { | |
| header = (ngx_http_cache_header_t *) p->header_in->start; | |
| header->expires = p->cache->ctx.expires; | |
| header->last_modified = p->cache->ctx.last_modified; | |
| header->date = p->cache->ctx.date; | |
| header->length = r->headers_out.content_length_n; | |
| p->cache->ctx.length = r->headers_out.content_length_n; | |
| header->key_len = p->cache->ctx.key0.len; | |
| ngx_memcpy(&header->key, p->cache->ctx.key0.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); | |
| return; | |
| } | |
| p->upstream->event_pipe = ep; | |
| ep->input_filter = ngx_event_pipe_copy_input_filter; | |
| ep->output_filter = (ngx_event_pipe_output_filter_pt) | |
| ngx_http_output_filter; | |
| ep->output_ctx = r; | |
| ep->tag = (ngx_buf_tag_t) &ngx_http_proxy_module; | |
| ep->bufs = p->lcf->bufs; | |
| ep->busy_size = p->lcf->busy_buffers_size; | |
| ep->upstream = p->upstream->peer.connection; | |
| ep->downstream = r->connection; | |
| ep->pool = r->pool; | |
| ep->log = r->connection->log; | |
| ep->cachable = p->cachable; | |
| ep->temp_file = ngx_pcalloc(r->pool, sizeof(ngx_temp_file_t)); | |
| if (ep->temp_file == NULL) { | |
| ngx_http_proxy_finalize_request(p, 0); | |
| return; | |
| } | |
| 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; | |
| if (p->cachable) { | |
| ep->temp_file->persistent = 1; | |
| } else { | |
| 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->preread_bufs = ngx_alloc_chain_link(r->pool); | |
| if (ep->preread_bufs == NULL) { | |
| ngx_http_proxy_finalize_request(p, 0); | |
| return; | |
| } | |
| ep->preread_bufs->buf = p->header_in; | |
| ep->preread_bufs->next = NULL; | |
| p->header_in->recycled = 1; | |
| ep->preread_size = p->header_in->last - p->header_in->pos; | |
| if (p->cachable) { | |
| ep->buf_to_file = ngx_calloc_buf(r->pool); | |
| if (ep->buf_to_file == NULL) { | |
| ngx_http_proxy_finalize_request(p, 0); | |
| return; | |
| } | |
| ep->buf_to_file->pos = p->header_in->start; | |
| ep->buf_to_file->last = p->header_in->pos; | |
| ep->buf_to_file->temporary = 1; | |
| } | |
| if (ngx_event_flags & NGX_USE_AIO_EVENT) { | |
| /* the posted aio operation can currupt a shadow buffer */ | |
| ep->single_buf = 1; | |
| } | |
| /* TODO: ep->free_bufs = 0 if use ngx_create_chain_of_bufs() */ | |
| ep->free_bufs = 1; | |
| /* | |
| * event_pipe would do p->header_in->last += ep->preread_size | |
| * as though these bytes were read. | |
| */ | |
| p->header_in->last = p->header_in->pos; | |
| if (p->lcf->cyclic_temp_file) { | |
| /* | |
| * we need to disable the use of sendfile() if we use cyclic temp file | |
| * because the writing a new data can interfere with sendfile() | |
| * that uses the same kernel file pages (at least on FreeBSD) | |
| */ | |
| ep->cyclic_temp_file = 1; | |
| r->connection->sendfile = 0; | |
| } else { | |
| ep->cyclic_temp_file = 0; | |
| } | |
| clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module); | |
| ep->read_timeout = p->lcf->read_timeout; | |
| ep->send_timeout = clcf->send_timeout; | |
| ep->send_lowat = clcf->send_lowat; | |
| p->upstream->peer.connection->read->handler = ngx_http_proxy_process_body; | |
| r->write_event_handler = ngx_http_proxy_process_downstream; | |
| ngx_http_proxy_process_body(p->upstream->peer.connection->read); | |
| return; | |
| } | |
| static void ngx_http_proxy_process_downstream(ngx_http_request_t *r) | |
| { | |
| ngx_http_proxy_process_body(r->connection->write); | |
| } | |
| static void ngx_http_proxy_process_body(ngx_event_t *ev) | |
| { | |
| ngx_connection_t *c; | |
| ngx_http_request_t *r; | |
| ngx_http_proxy_ctx_t *p; | |
| ngx_event_pipe_t *ep; | |
| c = ev->data; | |
| if (ev->write) { | |
| ngx_log_debug0(NGX_LOG_DEBUG_HTTP, ev->log, 0, | |
| "http proxy process downstream"); | |
| r = c->data; | |
| p = ngx_http_get_module_ctx(r, ngx_http_proxy_module); | |
| p->action = "sending to client"; | |
| } else { | |
| ngx_log_debug0(NGX_LOG_DEBUG_HTTP, ev->log, 0, | |
| "http proxy process upstream"); | |
| p = c->data; | |
| p->action = "reading upstream body"; | |
| } | |
| ep = p->upstream->event_pipe; | |
| if (ev->timedout) { | |
| if (ev->write) { | |
| ep->downstream_error = 1; | |
| ngx_log_error(NGX_LOG_ERR, c->log, NGX_ETIMEDOUT, | |
| "client timed out"); | |
| } else { | |
| ep->upstream_error = 1; | |
| ngx_log_error(NGX_LOG_ERR, c->log, NGX_ETIMEDOUT, | |
| "upstream timed out"); | |
| } | |
| } else { | |
| if (ngx_event_pipe(ep, ev->write) == NGX_ABORT) { | |
| ngx_http_proxy_finalize_request(p, 0); | |
| return; | |
| } | |
| } | |
| if (p->upstream->peer.connection) { | |
| #if (NGX_HTTP_FILE_CACHE) | |
| if (ep->upstream_done && p->cachable) { | |
| if (ngx_http_proxy_update_cache(p) == NGX_ERROR) { | |
| ngx_http_busy_unlock(p->lcf->busy_lock, &p->busy_lock); | |
| ngx_http_proxy_finalize_request(p, 0); | |
| return; | |
| } | |
| } else if (ep->upstream_eof && p->cachable) { | |
| /* TODO: check length & update cache */ | |
| if (ngx_http_proxy_update_cache(p) == NGX_ERROR) { | |
| ngx_http_busy_unlock(p->lcf->busy_lock, &p->busy_lock); | |
| ngx_http_proxy_finalize_request(p, 0); | |
| return; | |
| } | |
| } | |
| #endif | |
| if (ep->upstream_done || ep->upstream_eof || ep->upstream_error) { | |
| ngx_log_debug1(NGX_LOG_DEBUG_HTTP, ev->log, 0, | |
| "http proxy upstream exit: %p", ep->out); | |
| ngx_http_busy_unlock(p->lcf->busy_lock, &p->busy_lock); | |
| ngx_http_proxy_finalize_request(p, 0); | |
| return; | |
| } | |
| } | |
| if (ep->downstream_error) { | |
| ngx_log_debug0(NGX_LOG_DEBUG_HTTP, ev->log, 0, | |
| "http proxy downstream error"); | |
| if (!p->cachable && p->upstream->peer.connection) { | |
| ngx_http_proxy_finalize_request(p, 0); | |
| } | |
| } | |
| } | |
| static void ngx_http_proxy_next_upstream(ngx_http_proxy_ctx_t *p, | |
| ngx_uint_t ft_type) | |
| { | |
| ngx_uint_t status; | |
| ngx_log_debug1(NGX_LOG_DEBUG_HTTP, p->request->connection->log, 0, | |
| "http proxy next upstream: %ui", ft_type); | |
| ngx_http_busy_unlock(p->lcf->busy_lock, &p->busy_lock); | |
| if (ft_type != NGX_HTTP_PROXY_FT_HTTP_404) { | |
| ngx_event_connect_peer_failed(&p->upstream->peer); | |
| } | |
| 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->peer.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->peer.connection) { | |
| ngx_http_proxy_close_connection(p); | |
| } | |
| if (p->request->connection->write->eof) { | |
| ngx_http_proxy_finalize_request(p, NGX_HTTP_CLIENT_CLOSED_REQUEST); | |
| return; | |
| } | |
| if (status) { | |
| p->state->status = status; | |
| if (p->upstream->peer.tries == 0 || !(p->lcf->next_upstream & ft_type)) | |
| { | |
| #if (NGX_HTTP_CACHE) | |
| if (p->stale && (p->lcf->use_stale & ft_type)) { | |
| ngx_http_proxy_finalize_request(p, | |
| ngx_http_proxy_send_cached_response(p)); | |
| return; | |
| } | |
| #endif | |
| ngx_http_proxy_finalize_request(p, status); | |
| return; | |
| } | |
| } | |
| if (p->lcf->busy_lock && !p->busy_locked) { | |
| ngx_http_proxy_upstream_busy_lock(p); | |
| } else { | |
| ngx_http_proxy_connect(p); | |
| } | |
| } |