Mercurial > hg > nginx
diff src/http/modules/proxy/ngx_http_proxy_handler.c @ 171:aff0e5d32af8
nginx-0.0.1-2003-11-03-20:33:31 import
| author | Igor Sysoev <igor@sysoev.ru> |
|---|---|
| date | Mon, 03 Nov 2003 17:33:31 +0000 |
| parents | c42be4185301 |
| children | caa57ddf6d77 |
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 @@ -6,25 +6,6 @@ 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 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); -static void ngx_http_proxy_close_connection(ngx_connection_t *c); - -static size_t ngx_http_proxy_log_error(void *data, char *buf, size_t len); static int ngx_http_proxy_init(ngx_cycle_t *cycle); static void *ngx_http_proxy_create_loc_conf(ngx_conf_t *cf); @@ -34,7 +15,7 @@ static char *ngx_http_proxy_merge_loc_co static char *ngx_http_proxy_set_pass(ngx_conf_t *cf, ngx_command_t *cmd, void *conf); static char *ngx_http_proxy_parse_upstream(ngx_str_t *url, - ngx_http_proxy_upstream_t *u); + ngx_http_proxy_upstream_conf_t *u); static ngx_conf_bitmask_t next_upstream_masks[] = { @@ -190,22 +171,16 @@ ngx_module_t ngx_http_proxy_module = { }; -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" -}; - - 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("Expires"), offsetof(ngx_http_proxy_headers_in_t, expires) }, + { ngx_string("Cache-Control"), + offsetof(ngx_http_proxy_headers_in_t, cache_control) }, + { ngx_string("X-Accel-Expires"), + offsetof(ngx_http_proxy_headers_in_t, x_accel_expires) }, + { ngx_string("Connection"), offsetof(ngx_http_proxy_headers_in_t, connection) }, { ngx_string("Content-Type"), @@ -221,19 +196,12 @@ ngx_http_header_t ngx_http_proxy_headers }; -static char http_version[] = " HTTP/1.0" CRLF; -static char host_header[] = "Host: "; -static char connection_close_header[] = "Connection: close" CRLF; - - - static int ngx_http_proxy_handler(ngx_http_request_t *r) { - int rc; - char *last; - ngx_http_cache_ctx_t *cctx; - ngx_http_proxy_ctx_t *p; - ngx_http_proxy_upstream_t *u; + int rc; + char *last; + ngx_http_cache_ctx_t *cctx; + ngx_http_proxy_ctx_t *p; ngx_http_create_ctx(r, p, ngx_http_proxy_module, sizeof(ngx_http_proxy_ctx_t), @@ -252,7 +220,7 @@ static int ngx_http_proxy_handler(ngx_ht rc = ngx_http_proxy_get_cached_response(p); if (rc == NGX_OK) { - return ngx_http_proxy_process_cached_response(p); + return ngx_http_proxy_send_cached_response(p); } if (rc == NGX_HTTP_INTERNAL_SERVER_ERROR) { @@ -267,1012 +235,7 @@ static int ngx_http_proxy_handler(ngx_ht } -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; - - ngx_init_array(p->states, r->pool, p->upstream.tries, - sizeof(ngx_http_proxy_state_t), - NGX_HTTP_INTERNAL_SERVER_ERROR); - - p->method = r->method; - - /* STUB */ p->cachable = p->lcf->cache; - - if (r->headers_in.content_length_n > 0) { - 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->pool = r->pool; - r->temp_file->warn = "a client request body is buffered " - "to a temporary file"; - /* 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, - probably we should not return anything */ - ngx_http_read_client_request_body(r, p->lcf->request_buffer_size); - - return NGX_DONE; - } - - ngx_http_proxy_init_request(p); - - return NGX_DONE; -} - - -static void ngx_http_proxy_init_request(void *data) -{ - ngx_http_proxy_ctx_t *p = data; - - ngx_chain_t *cl; - ngx_http_request_t *r; - ngx_output_chain_ctx_t *octx; - ngx_chain_writer_ctx_t *wctx; - - r = p->request; - -ngx_log_debug(r->connection->log, "timer_set: %d" _ - r->connection->read->timer_set); - - if (r->connection->read->timer_set) { - ngx_del_timer(r->connection->read); - } - - if (!(cl = ngx_http_proxy_create_request(p))) { - ngx_http_finalize_request(r, NGX_HTTP_INTERNAL_SERVER_ERROR); - return; - } - - if (r->request_hunks) { - cl->next = r->request_hunks; - } - - r->request_hunks = cl; - - p->upstream.log = r->connection->log; - p->saved_ctx = r->connection->log->data; - p->saved_handler = r->connection->log->handler; - r->connection->log->data = p; - r->connection->log->handler = ngx_http_proxy_log_error; - p->action = "connecting to upstream"; - - 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; - 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; - - 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; - - ngx_http_proxy_connect(p); -} - - -static ngx_chain_t *ngx_http_proxy_create_request(ngx_http_proxy_ctx_t *p) -{ - int i; - size_t len; - ngx_hunk_t *h; - ngx_chain_t *chain; - ngx_table_elt_t *header; - ngx_http_request_t *r; - ngx_http_proxy_upstream_t *u; - - r = p->request; - u = p->lcf->upstream; - - len = http_methods[p->method - 1].len - + u->uri.len - + r->uri.len - u->location->len - + 1 + r->args.len /* 1 is for "?" */ - + sizeof(http_version) - 1 - + sizeof(host_header) - 1 + u->host_header.len + 2 - /* 2 is for "\r\n" */ - + sizeof(connection_close_header) - 1 - + 2; /* 2 is for "\r\n" at the header end */ - - header = (ngx_table_elt_t *) r->headers_in.headers->elts; - for (i = 0; i < r->headers_in.headers->nelts; i++) { - - if (&header[i] == r->headers_in.host) { - continue; - } - - if (&header[i] == r->headers_in.connection) { - continue; - } - - /* 2 is for ": " and 2 is for "\r\n" */ - len += header[i].key.len + 2 + header[i].value.len + 2; - } - - /* STUB */ len++; - - ngx_test_null(h, ngx_create_temp_hunk(r->pool, len), NULL); - ngx_alloc_link_and_set_hunk(chain, h, r->pool, NULL); - - - /* the request line */ - - h->last = ngx_cpymem(h->last, http_methods[p->method - 1].data, - http_methods[p->method - 1].len); - - h->last = ngx_cpymem(h->last, u->uri.data, u->uri.len); - - h->last = ngx_cpymem(h->last, - r->uri.data + u->location->len, - r->uri.len - u->location->len); - - if (r->args.len > 0) { - *(h->last++) = '?'; - h->last = ngx_cpymem(h->last, r->args.data, r->args.len); - } - - h->last = ngx_cpymem(h->last, http_version, sizeof(http_version) - 1); - - - /* "Host" header */ - - h->last = ngx_cpymem(h->last, host_header, sizeof(host_header) - 1); - h->last = ngx_cpymem(h->last, u->host_header.data, u->host_header.len); - *(h->last++) = CR; *(h->last++) = LF; - - - /* "Connection: close" header */ - - h->last = ngx_cpymem(h->last, connection_close_header, - sizeof(connection_close_header) - 1); - - - for (i = 0; i < r->headers_in.headers->nelts; i++) { - - 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; - } - - h->last = ngx_cpymem(h->last, header[i].key.data, header[i].key.len); - - *(h->last++) = ':'; *(h->last++) = ' '; - - h->last = ngx_cpymem(h->last, header[i].value.data, - header[i].value.len); - - *(h->last++) = CR; *(h->last++) = LF; - - ngx_log_debug(r->connection->log, "proxy: '%s: %s'" _ - header[i].key.data _ header[i].value.data); - } - - /* add "\r\n" at the header end */ - *(h->last++) = CR; *(h->last++) = LF; - - /* STUB */ *(h->last) = '\0'; - ngx_log_debug(r->connection->log, "PROXY:\n'%s'" _ h->pos); - - return chain; -} - - -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; - - if (wev->timedout) { - p->action = "sending request to upstream"; - ngx_http_proxy_next_upstream(p, NGX_HTTP_PROXY_FT_TIMEOUT); - return; - } - - ngx_http_proxy_send_request(p); -} - - -static void ngx_http_proxy_dummy_handler(ngx_event_t *wev) -{ - ngx_log_debug(wev->log, "dummy handler"); -} - - -static void ngx_http_proxy_connect(ngx_http_proxy_ctx_t *p) -{ - 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; - } - - 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; - - octx = p->output_chain_ctx; - - if (p->upstream.tries > 1 && p->request_sent) { - ngx_http_proxy_reinit_upstream(p); - } - - /* 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; - } - - octx->free->hunk = r->request_body_hunk; - octx->free->next = NULL; - octx->hunks = 1; - - r->request_body_hunk->pos = r->request_body_hunk->start; - r->request_body_hunk->last = r->request_body_hunk->start; - } - - p->request_sent = 0; - - if (rc == NGX_AGAIN) { - ngx_add_timer(c->write, p->lcf->connect_timeout); - return; - } - - /* rc == NGX_OK */ - -#if 1 /* test only */ - - if (c->read->ready) { - /* post aio operation */ - ngx_http_proxy_process_upstream_status_line(c->read); - return; - } -#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; - 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 ? NULL : p->request->request_hunks); - - if (rc == NGX_ERROR) { - ngx_http_proxy_next_upstream(p, NGX_HTTP_PROXY_FT_ERROR); - return; - } - - 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; - } - - return; - } - - /* rc == NGX_OK */ - - 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; - } - -#if 0 - 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 - - p->upstream.connection->write->event_handler = ngx_http_proxy_dummy_handler; - - if (ngx_handle_level_write_event(c->write) == NGX_ERROR) { - ngx_http_proxy_finalize_request(p, NGX_HTTP_INTERNAL_SERVER_ERROR); - return; - } -} - - -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_debug(rev->log, "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_hunk(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_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_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->upstream.cached = 0; - - rc = ngx_http_proxy_parse_status_line(p); - - if (rc == NGX_AGAIN) { - 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_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->status = NGX_HTTP_OK; - ngx_http_proxy_send_response(p); - } - - return; - } - - /* rc == NGX_OK */ - - 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; - p->status_line.data = ngx_palloc(p->request->pool, p->status_line.len + 1); - if (p->status_line.data == NULL) { - ngx_http_proxy_finalize_request(p, NGX_HTTP_INTERNAL_SERVER_ERROR); - return; - } - ngx_cpystrn(p->status_line.data, p->status_start, p->status_line.len + 1); - - ngx_log_debug(rev->log, "http proxy status %d '%s'" _ - p->status _ p->status_line.data); - - if (p->headers_in.headers) { - p->headers_in.headers->nelts = 0; - } else { - p->headers_in.headers = ngx_create_table(p->request->pool, 20); - } - - c->read->event_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_debug(rev->log, "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) { - - /* a header line has been parsed successfully */ - - 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; - } - - 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->headers_in - + ngx_http_proxy_headers_in[i].offset)) = h; - break; - } - } - - ngx_log_debug(c->log, "HTTP proxy header: '%s: %s'" _ - h->key.data _ h->value.data); - - continue; - - } else if (rc == NGX_HTTP_PARSE_HEADER_DONE) { - - /* a whole header has been parsed successfully */ - - ngx_log_debug(c->log, "HTTP header done"); - - ngx_http_proxy_send_response(p); - return; - - } else if (rc != NGX_AGAIN) { - - /* 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.connection->read; - - n = p->header_in->last - p->header_in->pos; - - if (n > 0) { - return n; - } - - n = ngx_recv(p->upstream.connection, p->header_in->last, - p->header_in->end - p->header_in->last); - - if (n == NGX_AGAIN) { - ngx_add_timer(rev, p->lcf->read_timeout); - - 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, 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 */ - - 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); - return; - } - - 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_hunk_tag_t) &ngx_http_proxy_module; - ep->bufs = p->lcf->bufs; - ep->busy_size = p->lcf->busy_buffers_size; - ep->upstream = p->upstream.connection; - ep->downstream = r->connection; - ep->pool = r->pool; - ep->log = r->connection->log; - - if (!(ep->temp_file = ngx_pcalloc(r->pool, sizeof(ngx_temp_file_t)))) { - 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; - 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_hunks = ngx_alloc_chain_link(r->pool); - if (ep->preread_hunks == NULL) { - ngx_http_proxy_finalize_request(p, 0); - return; - } - 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; - - if (ngx_event_flags & NGX_USE_AIO_EVENT) { - - /* the posted aio operation can currupt shadow buf */ - ep->single_buf = 1; - } - - /* TODO: ep->free_bufs = 0 if use ngx_create_chain_of_hunks() */ - 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; - - ep->cachable = p->cachable; - - 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->sendfile = 0; - - } else { - ep->cyclic_temp_file = 0; - r->sendfile = 1; - } - - 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->event_pipe = ep; - - p->upstream.connection->read->event_handler = ngx_http_proxy_process_body; - r->connection->write->event_handler = ngx_http_proxy_process_body; - - ngx_http_proxy_process_body(p->upstream.connection->read); - - return; -} - - -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_debug(ev->log, "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_debug(ev->log, "http proxy process upstream"); - p = c->data; - r = p->request; - p->action = "reading upstream body"; - } - - ep = p->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.connection) { - if (ep->upstream_done) { - 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) { - ngx_http_proxy_close_connection(p->upstream.connection); - p->upstream.connection = NULL; - } - } - - if (ep->downstream_done) { - ngx_log_debug(ev->log, "http proxy downstream done"); - ngx_http_proxy_finalize_request(p, r->main ? 0 : ngx_http_send_last(r)); - return; - } - - if (ep->downstream_error) { - if (!p->cachable && p->upstream.connection) { - ngx_http_proxy_close_connection(p->upstream.connection); - p->upstream.connection = NULL; - } - - if (p->upstream.connection == NULL) { - ngx_http_close_connection(c); - } - } - - return; -} - - -static int ngx_http_proxy_update_cache(ngx_http_proxy_ctx_t *p) -{ - if (p->cache == NULL) { - return NGX_OK; - } - - return ngx_http_cache_update_file(p->request, &p->cache->ctx, - &p->event_pipe->temp_file->file.name); -} - - -static void ngx_http_proxy_next_upstream(ngx_http_proxy_ctx_t *p, int ft_type) -{ - int status; - -ngx_log_debug(p->request->connection->log, "next upstream: %d" _ ft_type); - - 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 (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)) { - - if (p->stale && (p->lcf->use_stale & ft_type)) { - /* - * TODO: use stale cached response if it exists and enabled - */ - } - - ngx_http_proxy_finalize_request(p, status); - return; - } - } - - ngx_http_proxy_connect(p); -} - - -static int ngx_http_proxy_log_state(ngx_http_proxy_ctx_t *p, int status) +int ngx_http_proxy_log_state(ngx_http_proxy_ctx_t *p, int status) { ngx_http_proxy_state_t *state; @@ -1282,20 +245,20 @@ static int ngx_http_proxy_log_state(ngx_ state->status = status; state->peer = - &p->upstream.peers->peers[p->upstream.cur_peer].addr_port_text; + &p->upstream->peer.peers->peers[p->upstream->peer.cur_peer].addr_port_text; return NGX_OK; } -static void ngx_http_proxy_finalize_request(ngx_http_proxy_ctx_t *p, int rc) +void ngx_http_proxy_finalize_request(ngx_http_proxy_ctx_t *p, int rc) { ngx_log_debug(p->request->connection->log, "finalize http proxy request"); - if (p->upstream.connection) { - ngx_http_proxy_close_connection(p->upstream.connection); - p->upstream.connection = NULL; + if (p->upstream->peer.connection) { + ngx_http_proxy_close_connection(p->upstream->peer.connection); + p->upstream->peer.connection = NULL; } if (p->header_sent @@ -1311,7 +274,7 @@ static void ngx_http_proxy_finalize_requ } -static void ngx_http_proxy_close_connection(ngx_connection_t *c) +void ngx_http_proxy_close_connection(ngx_connection_t *c) { ngx_log_debug(c->log, "proxy close connection: %d" _ c->fd); @@ -1354,20 +317,26 @@ static void ngx_http_proxy_close_connect } -static size_t ngx_http_proxy_log_error(void *data, char *buf, size_t len) +size_t ngx_http_proxy_log_error(void *data, char *buf, size_t len) { ngx_http_proxy_ctx_t *p = data; + ngx_http_request_t *r; + ngx_peer_connection_t *peer; + + r = p->request; + peer = &p->upstream->peer; + return ngx_snprintf(buf, len, - " while %s, client: %s, URL: %s, upstream: %s%s%s%s%s", - p->action, - p->request->connection->addr_text.data, - p->request->unparsed_uri.data, - p->upstream.peers->peers[p->upstream.cur_peer].addr_port_text.data, - p->lcf->upstream->uri.data, - p->request->uri.data + p->lcf->upstream->location->len, - p->request->args.len ? "?" : "", - p->request->args.len ? p->request->args.data : ""); + " while %s, client: %s, URL: %s, upstream: %s%s%s%s%s", + p->action, + r->connection->addr_text.data, + r->unparsed_uri.data, + peer->peers->peers[peer->cur_peer].addr_port_text.data, + p->lcf->upstream->uri.data, + r->uri.data + p->lcf->upstream->location->len, + r->args.len ? "?" : "", + r->args.len ? r->args.data : ""); } @@ -1494,7 +463,7 @@ static char *ngx_http_proxy_set_pass(ngx } ngx_test_null(lcf->upstream, - ngx_pcalloc(cf->pool, sizeof(ngx_http_proxy_upstream_t)), + ngx_pcalloc(cf->pool, sizeof(ngx_http_proxy_upstream_conf_t)), NGX_CONF_ERROR); lcf->upstream->url.len = value[1].len; @@ -1606,7 +575,7 @@ static char *ngx_http_proxy_set_pass(ngx static char *ngx_http_proxy_parse_upstream(ngx_str_t *url, - ngx_http_proxy_upstream_t *u) + ngx_http_proxy_upstream_conf_t *u) { size_t i;