Log: split access log from nxt_router.c.

No functional changes.

auto/sources

@@ -84,6 +84,7 @@ NXT_LIB_SRCS=" \
     src/nxt_signal_handlers.c \
     src/nxt_controller.c \
     src/nxt_router.c \
+    src/nxt_router_access_log.c \
     src/nxt_h1proto.c \
     src/nxt_http_request.c \
     src/nxt_http_response.c \

src/nxt_router.c

@@ -92,15 +92,10 @@ static void nxt_router_app_restart_handler(nxt_task_t *task,
     nxt_port_recv_msg_t *msg);
 static void nxt_router_remove_pid_handler(nxt_task_t *task,
     nxt_port_recv_msg_t *msg);
-static void nxt_router_access_log_reopen_handler(nxt_task_t *task,
-    nxt_port_recv_msg_t *msg);
 
 static nxt_router_temp_conf_t *nxt_router_temp_conf(nxt_task_t *task);
-static void nxt_router_conf_apply(nxt_task_t *task, void *obj, void *data);
 static void nxt_router_conf_ready(nxt_task_t *task,
     nxt_router_temp_conf_t *tmcf);
-static void nxt_router_conf_error(nxt_task_t *task,
-    nxt_router_temp_conf_t *tmcf);
 static void nxt_router_conf_send(nxt_task_t *task,
     nxt_router_temp_conf_t *tmcf, nxt_port_msg_type_t type);
 
@@ -201,27 +196,6 @@ static void nxt_router_req_headers_ack_handler(nxt_task_t *task,
 static void nxt_router_listen_socket_release(nxt_task_t *task,
     nxt_socket_conf_t *skcf);
 
-static void nxt_router_access_log_writer(nxt_task_t *task,
-    nxt_http_request_t *r, nxt_router_access_log_t *access_log);
-static u_char *nxt_router_access_log_date(u_char *buf, nxt_realtime_t *now,
-    struct tm *tm, size_t size, const char *format);
-static void nxt_router_access_log_open(nxt_task_t *task,
-    nxt_router_temp_conf_t *tmcf);
-static void nxt_router_access_log_ready(nxt_task_t *task,
-    nxt_port_recv_msg_t *msg, void *data);
-static void nxt_router_access_log_error(nxt_task_t *task,
-    nxt_port_recv_msg_t *msg, void *data);
-static void nxt_router_access_log_use(nxt_thread_spinlock_t *lock,
-    nxt_router_access_log_t *access_log);
-static void nxt_router_access_log_release(nxt_task_t *task,
-    nxt_thread_spinlock_t *lock, nxt_router_access_log_t *access_log);
-static void nxt_router_access_log_reopen_completion(nxt_task_t *task, void *obj,
-    void *data);
-static void nxt_router_access_log_reopen_ready(nxt_task_t *task,
-    nxt_port_recv_msg_t *msg, void *data);
-static void nxt_router_access_log_reopen_error(nxt_task_t *task,
-    nxt_port_recv_msg_t *msg, void *data);
-
 static void nxt_router_app_port_ready(nxt_task_t *task,
     nxt_port_recv_msg_t *msg, void *data);
 static void nxt_router_app_port_error(nxt_task_t *task,
@@ -271,7 +245,7 @@ static void nxt_router_get_mmap_handler(nxt_task_t *task,
 
 extern const nxt_http_request_state_t  nxt_http_websocket;
 
-static nxt_router_t  *nxt_router;
+nxt_router_t  *nxt_router;
 
 static const nxt_str_t http_prefix = nxt_string("HTTP_");
 static const nxt_str_t empty_prefix = nxt_string("");
@@ -1075,7 +1049,7 @@ nxt_router_app_need_start(nxt_app_t *app)
 }
 
 
-static void
+void
 nxt_router_conf_apply(nxt_task_t *task, void *obj, void *data)
 {
     nxt_int_t                    ret;
@@ -1231,7 +1205,7 @@ nxt_router_conf_ready(nxt_task_t *task, nxt_router_temp_conf_t *tmcf)
 }
 
 
-static void
+void
 nxt_router_conf_error(nxt_task_t *task, nxt_router_temp_conf_t *tmcf)
 {
     nxt_app_t          *app;
@@ -1483,7 +1457,7 @@ nxt_router_conf_create(nxt_task_t *task, nxt_router_temp_conf_t *tmcf,
     nxt_mp_t                    *mp, *app_mp;
     uint32_t                    next, next_target;
     nxt_int_t                   ret;
-    nxt_str_t                   name, path, target;
+    nxt_str_t                   name, target;
     nxt_app_t                   *app, *prev;
     nxt_str_t                   *t, *s, *targets;
     nxt_uint_t                  n, i;
@@ -1503,7 +1477,6 @@ nxt_router_conf_create(nxt_task_t *task, nxt_router_temp_conf_t *tmcf,
     nxt_event_engine_t          *engine;
     nxt_app_lang_module_t       *lang;
     nxt_router_app_conf_t       apcf;
-    nxt_router_access_log_t     *access_log;
     nxt_router_listener_conf_t  lscf;
 
     static nxt_str_t  http_path = nxt_string("/settings/http");
@@ -1793,6 +1766,7 @@ nxt_router_conf_create(nxt_task_t *task, nxt_router_temp_conf_t *tmcf,
         if (nxt_slow_path(routes == NULL)) {
             return NXT_ERROR;
         }
+
         rtcf->routes = routes;
     }
 
@@ -1980,33 +1954,10 @@ nxt_router_conf_create(nxt_task_t *task, nxt_router_temp_conf_t *tmcf,
     value = nxt_conf_get_path(root, &access_log_path);
 
     if (value != NULL) {
-        nxt_conf_get_string(value, &path);
+        ret = nxt_router_access_log_create(task, rtcf, value);
-
+        if (nxt_slow_path(ret != NXT_OK)) {
-        access_log = router->access_log;
+            goto fail;
-
-        if (access_log != NULL && nxt_strstr_eq(&path, &access_log->path)) {
-            nxt_router_access_log_use(&router->lock, access_log);
-
-        } else {
-            access_log = nxt_malloc(sizeof(nxt_router_access_log_t)
-                                    + path.length);
-            if (access_log == NULL) {
-                nxt_alert(task, "failed to allocate access log structure");
-                goto fail;
-            }
-
-            access_log->fd = -1;
-            access_log->handler = &nxt_router_access_log_writer;
-            access_log->count = 1;
-
-            access_log->path.length = path.length;
-            access_log->path.start = (u_char *) access_log
-                                     + sizeof(nxt_router_access_log_t);
-
-            nxt_memcpy(access_log->path.start, path.start, path.length);
         }
-
-        rtcf->access_log = access_log;
     }
 
     nxt_queue_add(&deleting_sockets, &router->sockets);
@@ -3759,384 +3710,6 @@ nxt_router_conf_release(nxt_task_t *task, nxt_socket_conf_joint_t *joint)
 }
 
 
-static void
-nxt_router_access_log_writer(nxt_task_t *task, nxt_http_request_t *r,
-    nxt_router_access_log_t *access_log)
-{
-    size_t     size;
-    u_char     *buf, *p;
-    nxt_off_t  bytes;
-
-    static nxt_time_string_t  date_cache = {
-        (nxt_atomic_uint_t) -1,
-        nxt_router_access_log_date,
-        "%02d/%s/%4d:%02d:%02d:%02d %c%02d%02d",
-        nxt_length("31/Dec/1986:19:40:00 +0300"),
-        NXT_THREAD_TIME_LOCAL,
-        NXT_THREAD_TIME_SEC,
-    };
-
-    size = r->remote->address_length
-           + 6                  /* ' - - [' */
-           + date_cache.size
-           + 3                  /* '] "' */
-           + r->method->length
-           + 1                  /* space */
-           + r->target.length
-           + 1                  /* space */
-           + r->version.length
-           + 2                  /* '" ' */
-           + 3                  /* status */
-           + 1                  /* space */
-           + NXT_OFF_T_LEN
-           + 2                  /* ' "' */
-           + (r->referer != NULL ? r->referer->value_length : 1)
-           + 3                  /* '" "' */
-           + (r->user_agent != NULL ? r->user_agent->value_length : 1)
-           + 2                  /* '"\n' */
-    ;
-
-    buf = nxt_mp_nget(r->mem_pool, size);
-    if (nxt_slow_path(buf == NULL)) {
-        return;
-    }
-
-    p = nxt_cpymem(buf, nxt_sockaddr_address(r->remote),
-                   r->remote->address_length);
-
-    p = nxt_cpymem(p, " - - [", 6);
-
-    p = nxt_thread_time_string(task->thread, &date_cache, p);
-
-    p = nxt_cpymem(p, "] \"", 3);
-
-    if (r->method->length != 0) {
-        p = nxt_cpymem(p, r->method->start, r->method->length);
-
-        if (r->target.length != 0) {
-            *p++ = ' ';
-            p = nxt_cpymem(p, r->target.start, r->target.length);
-
-            if (r->version.length != 0) {
-                *p++ = ' ';
-                p = nxt_cpymem(p, r->version.start, r->version.length);
-            }
-        }
-
-    } else {
-        *p++ = '-';
-    }
-
-    p = nxt_cpymem(p, "\" ", 2);
-
-    p = nxt_sprintf(p, p + 3, "%03d", r->status);
-
-    *p++ = ' ';
-
-    bytes = nxt_http_proto[r->protocol].body_bytes_sent(task, r->proto);
-
-    p = nxt_sprintf(p, p + NXT_OFF_T_LEN, "%O", bytes);
-
-    p = nxt_cpymem(p, " \"", 2);
-
-    if (r->referer != NULL) {
-        p = nxt_cpymem(p, r->referer->value, r->referer->value_length);
-
-    } else {
-        *p++ = '-';
-    }
-
-    p = nxt_cpymem(p, "\" \"", 3);
-
-    if (r->user_agent != NULL) {
-        p = nxt_cpymem(p, r->user_agent->value, r->user_agent->value_length);
-
-    } else {
-        *p++ = '-';
-    }
-
-    p = nxt_cpymem(p, "\"\n", 2);
-
-    nxt_fd_write(access_log->fd, buf, p - buf);
-}
-
-
-static u_char *
-nxt_router_access_log_date(u_char *buf, nxt_realtime_t *now, struct tm *tm,
-    size_t size, const char *format)
-{
-    u_char  sign;
-    time_t  gmtoff;
-
-    static const char  *month[] = { "Jan", "Feb", "Mar", "Apr", "May", "Jun",
-                                    "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" };
-
-    gmtoff = nxt_timezone(tm) / 60;
-
-    if (gmtoff < 0) {
-        gmtoff = -gmtoff;
-        sign = '-';
-
-    } else {
-        sign = '+';
-    }
-
-    return nxt_sprintf(buf, buf + size, format,
-                       tm->tm_mday, month[tm->tm_mon], tm->tm_year + 1900,
-                       tm->tm_hour, tm->tm_min, tm->tm_sec,
-                       sign, gmtoff / 60, gmtoff % 60);
-}
-
-
-static void
-nxt_router_access_log_open(nxt_task_t *task, nxt_router_temp_conf_t *tmcf)
-{
-    uint32_t                 stream;
-    nxt_int_t                ret;
-    nxt_buf_t                *b;
-    nxt_port_t               *main_port, *router_port;
-    nxt_runtime_t            *rt;
-    nxt_router_access_log_t  *access_log;
-
-    access_log = tmcf->router_conf->access_log;
-
-    b = nxt_buf_mem_alloc(tmcf->mem_pool, access_log->path.length + 1, 0);
-    if (nxt_slow_path(b == NULL)) {
-        goto fail;
-    }
-
-    b->completion_handler = nxt_buf_dummy_completion;
-
-    nxt_buf_cpystr(b, &access_log->path);
-    *b->mem.free++ = '\0';
-
-    rt = task->thread->runtime;
-    main_port = rt->port_by_type[NXT_PROCESS_MAIN];
-    router_port = rt->port_by_type[NXT_PROCESS_ROUTER];
-
-    stream = nxt_port_rpc_register_handler(task, router_port,
-                                           nxt_router_access_log_ready,
-                                           nxt_router_access_log_error,
-                                           -1, tmcf);
-    if (nxt_slow_path(stream == 0)) {
-        goto fail;
-    }
-
-    ret = nxt_port_socket_write(task, main_port, NXT_PORT_MSG_ACCESS_LOG, -1,
-                                stream, router_port->id, b);
-
-    if (nxt_slow_path(ret != NXT_OK)) {
-        nxt_port_rpc_cancel(task, router_port, stream);
-        goto fail;
-    }
-
-    return;
-
-fail:
-
-    nxt_router_conf_error(task, tmcf);
-}
-
-
-static void
-nxt_router_access_log_ready(nxt_task_t *task, nxt_port_recv_msg_t *msg,
-    void *data)
-{
-    nxt_router_temp_conf_t   *tmcf;
-    nxt_router_access_log_t  *access_log;
-
-    tmcf = data;
-
-    access_log = tmcf->router_conf->access_log;
-
-    access_log->fd = msg->fd[0];
-
-    nxt_work_queue_add(&task->thread->engine->fast_work_queue,
-                       nxt_router_conf_apply, task, tmcf, NULL);
-}
-
-
-static void
-nxt_router_access_log_error(nxt_task_t *task, nxt_port_recv_msg_t *msg,
-    void *data)
-{
-    nxt_router_temp_conf_t  *tmcf;
-
-    tmcf = data;
-
-    nxt_router_conf_error(task, tmcf);
-}
-
-
-static void
-nxt_router_access_log_use(nxt_thread_spinlock_t *lock,
-    nxt_router_access_log_t *access_log)
-{
-    if (access_log == NULL) {
-        return;
-    }
-
-    nxt_thread_spin_lock(lock);
-
-    access_log->count++;
-
-    nxt_thread_spin_unlock(lock);
-}
-
-
-static void
-nxt_router_access_log_release(nxt_task_t *task, nxt_thread_spinlock_t *lock,
-    nxt_router_access_log_t *access_log)
-{
-    if (access_log == NULL) {
-        return;
-    }
-
-    nxt_thread_spin_lock(lock);
-
-    if (--access_log->count != 0) {
-        access_log = NULL;
-    }
-
-    nxt_thread_spin_unlock(lock);
-
-    if (access_log != NULL) {
-
-        if (access_log->fd != -1) {
-            nxt_fd_close(access_log->fd);
-        }
-
-        nxt_free(access_log);
-    }
-}
-
-
-typedef struct {
-    nxt_mp_t                 *mem_pool;
-    nxt_router_access_log_t  *access_log;
-} nxt_router_access_log_reopen_t;
-
-
-static void
-nxt_router_access_log_reopen_handler(nxt_task_t *task, nxt_port_recv_msg_t *msg)
-{
-    nxt_mp_t                        *mp;
-    uint32_t                        stream;
-    nxt_int_t                       ret;
-    nxt_buf_t                       *b;
-    nxt_port_t                      *main_port, *router_port;
-    nxt_runtime_t                   *rt;
-    nxt_router_access_log_t         *access_log;
-    nxt_router_access_log_reopen_t  *reopen;
-
-    access_log = nxt_router->access_log;
-
-    if (access_log == NULL) {
-        return;
-    }
-
-    mp = nxt_mp_create(1024, 128, 256, 32);
-    if (nxt_slow_path(mp == NULL)) {
-        return;
-    }
-
-    reopen = nxt_mp_get(mp, sizeof(nxt_router_access_log_reopen_t));
-    if (nxt_slow_path(reopen == NULL)) {
-        goto fail;
-    }
-
-    reopen->mem_pool = mp;
-    reopen->access_log = access_log;
-
-    b = nxt_buf_mem_alloc(mp, access_log->path.length + 1, 0);
-    if (nxt_slow_path(b == NULL)) {
-        goto fail;
-    }
-
-    b->completion_handler = nxt_router_access_log_reopen_completion;
-
-    nxt_buf_cpystr(b, &access_log->path);
-    *b->mem.free++ = '\0';
-
-    rt = task->thread->runtime;
-    main_port = rt->port_by_type[NXT_PROCESS_MAIN];
-    router_port = rt->port_by_type[NXT_PROCESS_ROUTER];
-
-    stream = nxt_port_rpc_register_handler(task, router_port,
-                                           nxt_router_access_log_reopen_ready,
-                                           nxt_router_access_log_reopen_error,
-                                           -1, reopen);
-    if (nxt_slow_path(stream == 0)) {
-        goto fail;
-    }
-
-    ret = nxt_port_socket_write(task, main_port, NXT_PORT_MSG_ACCESS_LOG, -1,
-                                stream, router_port->id, b);
-
-    if (nxt_slow_path(ret != NXT_OK)) {
-        nxt_port_rpc_cancel(task, router_port, stream);
-        goto fail;
-    }
-
-    nxt_mp_retain(mp);
-
-    return;
-
-fail:
-
-    nxt_mp_destroy(mp);
-}
-
-
-static void
-nxt_router_access_log_reopen_completion(nxt_task_t *task, void *obj, void *data)
-{
-    nxt_mp_t   *mp;
-    nxt_buf_t  *b;
-
-    b = obj;
-    mp = b->data;
-
-    nxt_mp_release(mp);
-}
-
-
-static void
-nxt_router_access_log_reopen_ready(nxt_task_t *task, nxt_port_recv_msg_t *msg,
-    void *data)
-{
-    nxt_router_access_log_t         *access_log;
-    nxt_router_access_log_reopen_t  *reopen;
-
-    reopen = data;
-
-    access_log = reopen->access_log;
-
-    if (access_log == nxt_router->access_log) {
-
-        if (nxt_slow_path(dup2(msg->fd[0], access_log->fd) == -1)) {
-            nxt_alert(task, "dup2(%FD, %FD) failed %E",
-                      msg->fd[0], access_log->fd, nxt_errno);
-        }
-    }
-
-    nxt_fd_close(msg->fd[0]);
-    nxt_mp_release(reopen->mem_pool);
-}
-
-
-static void
-nxt_router_access_log_reopen_error(nxt_task_t *task, nxt_port_recv_msg_t *msg,
-    void *data)
-{
-    nxt_router_access_log_reopen_t  *reopen;
-
-    reopen = data;
-
-    nxt_mp_release(reopen->mem_pool);
-}
-
-
 static void
 nxt_router_thread_exit_handler(nxt_task_t *task, void *obj, void *data)
 {

src/nxt_router.h

@@ -237,7 +237,23 @@ nxt_int_t nxt_router_application_init(nxt_router_conf_t *rtcf, nxt_str_t *name,
     nxt_str_t *target, nxt_http_action_t *action);
 void nxt_router_listen_event_release(nxt_task_t *task, nxt_listen_event_t *lev,
     nxt_socket_conf_joint_t *joint);
+
+void nxt_router_conf_apply(nxt_task_t *task, void *obj, void *data);
+void nxt_router_conf_error(nxt_task_t *task, nxt_router_temp_conf_t *tmcf);
 void nxt_router_conf_release(nxt_task_t *task, nxt_socket_conf_joint_t *joint);
 
+nxt_int_t nxt_router_access_log_create(nxt_task_t *task,
+    nxt_router_conf_t *rtcf, nxt_conf_value_t *value);
+void nxt_router_access_log_open(nxt_task_t *task, nxt_router_temp_conf_t *tmcf);
+void nxt_router_access_log_use(nxt_thread_spinlock_t *lock,
+    nxt_router_access_log_t *access_log);
+void nxt_router_access_log_release(nxt_task_t *task,
+    nxt_thread_spinlock_t *lock, nxt_router_access_log_t *access_log);
+void nxt_router_access_log_reopen_handler(nxt_task_t *task,
+    nxt_port_recv_msg_t *msg);
+
+
+extern nxt_router_t  *nxt_router;
+
 
 #endif  /* _NXT_ROUTER_H_INCLUDED_ */

src/nxt_router_access_log.c

@@ -0,0 +1,446 @@
+
+/*
+ * Copyright (C) Igor Sysoev
+ * Copyright (C) Valentin V. Bartenev
+ * Copyright (C) NGINX, Inc.
+ */
+
+#include <nxt_router.h>
+#include <nxt_conf.h>
+#include <nxt_http.h>
+
+
+static void nxt_router_access_log_writer(nxt_task_t *task,
+    nxt_http_request_t *r, nxt_router_access_log_t *access_log);
+static u_char *nxt_router_access_log_date(u_char *buf, nxt_realtime_t *now,
+    struct tm *tm, size_t size, const char *format);
+static void nxt_router_access_log_ready(nxt_task_t *task,
+    nxt_port_recv_msg_t *msg, void *data);
+static void nxt_router_access_log_error(nxt_task_t *task,
+    nxt_port_recv_msg_t *msg, void *data);
+static void nxt_router_access_log_reopen_completion(nxt_task_t *task, void *obj,
+    void *data);
+static void nxt_router_access_log_reopen_ready(nxt_task_t *task,
+    nxt_port_recv_msg_t *msg, void *data);
+static void nxt_router_access_log_reopen_error(nxt_task_t *task,
+    nxt_port_recv_msg_t *msg, void *data);
+
+
+nxt_int_t
+nxt_router_access_log_create(nxt_task_t *task, nxt_router_conf_t *rtcf,
+    nxt_conf_value_t *value)
+{
+    nxt_str_t                path;
+    nxt_router_t             *router;
+    nxt_router_access_log_t  *access_log;
+
+    router = nxt_router;
+
+    nxt_conf_get_string(value, &path);
+
+    access_log = router->access_log;
+
+    if (access_log != NULL && nxt_strstr_eq(&path, &access_log->path)) {
+        nxt_router_access_log_use(&router->lock, access_log);
+
+    } else {
+        access_log = nxt_malloc(sizeof(nxt_router_access_log_t)
+                                + path.length);
+        if (access_log == NULL) {
+            nxt_alert(task, "failed to allocate access log structure");
+            return NXT_ERROR;
+        }
+
+        access_log->fd = -1;
+        access_log->handler = &nxt_router_access_log_writer;
+        access_log->count = 1;
+
+        access_log->path.length = path.length;
+        access_log->path.start = (u_char *) access_log
+                                 + sizeof(nxt_router_access_log_t);
+
+        nxt_memcpy(access_log->path.start, path.start, path.length);
+    }
+
+    rtcf->access_log = access_log;
+
+    return NXT_OK;
+}
+
+
+static void
+nxt_router_access_log_writer(nxt_task_t *task, nxt_http_request_t *r,
+    nxt_router_access_log_t *access_log)
+{
+    size_t     size;
+    u_char     *buf, *p;
+    nxt_off_t  bytes;
+
+    static nxt_time_string_t  date_cache = {
+        (nxt_atomic_uint_t) -1,
+        nxt_router_access_log_date,
+        "%02d/%s/%4d:%02d:%02d:%02d %c%02d%02d",
+        nxt_length("31/Dec/1986:19:40:00 +0300"),
+        NXT_THREAD_TIME_LOCAL,
+        NXT_THREAD_TIME_SEC,
+    };
+
+    size = r->remote->address_length
+           + 6                  /* ' - - [' */
+           + date_cache.size
+           + 3                  /* '] "' */
+           + r->method->length
+           + 1                  /* space */
+           + r->target.length
+           + 1                  /* space */
+           + r->version.length
+           + 2                  /* '" ' */
+           + 3                  /* status */
+           + 1                  /* space */
+           + NXT_OFF_T_LEN
+           + 2                  /* ' "' */
+           + (r->referer != NULL ? r->referer->value_length : 1)
+           + 3                  /* '" "' */
+           + (r->user_agent != NULL ? r->user_agent->value_length : 1)
+           + 2                  /* '"\n' */
+    ;
+
+    buf = nxt_mp_nget(r->mem_pool, size);
+    if (nxt_slow_path(buf == NULL)) {
+        return;
+    }
+
+    p = nxt_cpymem(buf, nxt_sockaddr_address(r->remote),
+                   r->remote->address_length);
+
+    p = nxt_cpymem(p, " - - [", 6);
+
+    p = nxt_thread_time_string(task->thread, &date_cache, p);
+
+    p = nxt_cpymem(p, "] \"", 3);
+
+    if (r->method->length != 0) {
+        p = nxt_cpymem(p, r->method->start, r->method->length);
+
+        if (r->target.length != 0) {
+            *p++ = ' ';
+            p = nxt_cpymem(p, r->target.start, r->target.length);
+
+            if (r->version.length != 0) {
+                *p++ = ' ';
+                p = nxt_cpymem(p, r->version.start, r->version.length);
+            }
+        }
+
+    } else {
+        *p++ = '-';
+    }
+
+    p = nxt_cpymem(p, "\" ", 2);
+
+    p = nxt_sprintf(p, p + 3, "%03d", r->status);
+
+    *p++ = ' ';
+
+    bytes = nxt_http_proto[r->protocol].body_bytes_sent(task, r->proto);
+
+    p = nxt_sprintf(p, p + NXT_OFF_T_LEN, "%O", bytes);
+
+    p = nxt_cpymem(p, " \"", 2);
+
+    if (r->referer != NULL) {
+        p = nxt_cpymem(p, r->referer->value, r->referer->value_length);
+
+    } else {
+        *p++ = '-';
+    }
+
+    p = nxt_cpymem(p, "\" \"", 3);
+
+    if (r->user_agent != NULL) {
+        p = nxt_cpymem(p, r->user_agent->value, r->user_agent->value_length);
+
+    } else {
+        *p++ = '-';
+    }
+
+    p = nxt_cpymem(p, "\"\n", 2);
+
+    nxt_fd_write(access_log->fd, buf, p - buf);
+}
+
+
+static u_char *
+nxt_router_access_log_date(u_char *buf, nxt_realtime_t *now, struct tm *tm,
+    size_t size, const char *format)
+{
+    u_char  sign;
+    time_t  gmtoff;
+
+    static const char  *month[] = { "Jan", "Feb", "Mar", "Apr", "May", "Jun",
+                                    "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" };
+
+    gmtoff = nxt_timezone(tm) / 60;
+
+    if (gmtoff < 0) {
+        gmtoff = -gmtoff;
+        sign = '-';
+
+    } else {
+        sign = '+';
+    }
+
+    return nxt_sprintf(buf, buf + size, format,
+                       tm->tm_mday, month[tm->tm_mon], tm->tm_year + 1900,
+                       tm->tm_hour, tm->tm_min, tm->tm_sec,
+                       sign, gmtoff / 60, gmtoff % 60);
+}
+
+
+void
+nxt_router_access_log_open(nxt_task_t *task, nxt_router_temp_conf_t *tmcf)
+{
+    uint32_t                 stream;
+    nxt_int_t                ret;
+    nxt_buf_t                *b;
+    nxt_port_t               *main_port, *router_port;
+    nxt_runtime_t            *rt;
+    nxt_router_access_log_t  *access_log;
+
+    access_log = tmcf->router_conf->access_log;
+
+    b = nxt_buf_mem_alloc(tmcf->mem_pool, access_log->path.length + 1, 0);
+    if (nxt_slow_path(b == NULL)) {
+        goto fail;
+    }
+
+    b->completion_handler = nxt_buf_dummy_completion;
+
+    nxt_buf_cpystr(b, &access_log->path);
+    *b->mem.free++ = '\0';
+
+    rt = task->thread->runtime;
+    main_port = rt->port_by_type[NXT_PROCESS_MAIN];
+    router_port = rt->port_by_type[NXT_PROCESS_ROUTER];
+
+    stream = nxt_port_rpc_register_handler(task, router_port,
+                                           nxt_router_access_log_ready,
+                                           nxt_router_access_log_error,
+                                           -1, tmcf);
+    if (nxt_slow_path(stream == 0)) {
+        goto fail;
+    }
+
+    ret = nxt_port_socket_write(task, main_port, NXT_PORT_MSG_ACCESS_LOG, -1,
+                                stream, router_port->id, b);
+
+    if (nxt_slow_path(ret != NXT_OK)) {
+        nxt_port_rpc_cancel(task, router_port, stream);
+        goto fail;
+    }
+
+    return;
+
+fail:
+
+    nxt_router_conf_error(task, tmcf);
+}
+
+
+static void
+nxt_router_access_log_ready(nxt_task_t *task, nxt_port_recv_msg_t *msg,
+    void *data)
+{
+    nxt_router_temp_conf_t   *tmcf;
+    nxt_router_access_log_t  *access_log;
+
+    tmcf = data;
+
+    access_log = tmcf->router_conf->access_log;
+
+    access_log->fd = msg->fd[0];
+
+    nxt_work_queue_add(&task->thread->engine->fast_work_queue,
+                       nxt_router_conf_apply, task, tmcf, NULL);
+}
+
+
+static void
+nxt_router_access_log_error(nxt_task_t *task, nxt_port_recv_msg_t *msg,
+    void *data)
+{
+    nxt_router_temp_conf_t  *tmcf;
+
+    tmcf = data;
+
+    nxt_router_conf_error(task, tmcf);
+}
+
+
+void
+nxt_router_access_log_use(nxt_thread_spinlock_t *lock,
+    nxt_router_access_log_t *access_log)
+{
+    if (access_log == NULL) {
+        return;
+    }
+
+    nxt_thread_spin_lock(lock);
+
+    access_log->count++;
+
+    nxt_thread_spin_unlock(lock);
+}
+
+
+void
+nxt_router_access_log_release(nxt_task_t *task, nxt_thread_spinlock_t *lock,
+    nxt_router_access_log_t *access_log)
+{
+    if (access_log == NULL) {
+        return;
+    }
+
+    nxt_thread_spin_lock(lock);
+
+    if (--access_log->count != 0) {
+        access_log = NULL;
+    }
+
+    nxt_thread_spin_unlock(lock);
+
+    if (access_log != NULL) {
+
+        if (access_log->fd != -1) {
+            nxt_fd_close(access_log->fd);
+        }
+
+        nxt_free(access_log);
+    }
+}
+
+
+typedef struct {
+    nxt_mp_t                 *mem_pool;
+    nxt_router_access_log_t  *access_log;
+} nxt_router_access_log_reopen_t;
+
+
+void
+nxt_router_access_log_reopen_handler(nxt_task_t *task, nxt_port_recv_msg_t *msg)
+{
+    nxt_mp_t                        *mp;
+    uint32_t                        stream;
+    nxt_int_t                       ret;
+    nxt_buf_t                       *b;
+    nxt_port_t                      *main_port, *router_port;
+    nxt_runtime_t                   *rt;
+    nxt_router_access_log_t         *access_log;
+    nxt_router_access_log_reopen_t  *reopen;
+
+    access_log = nxt_router->access_log;
+
+    if (access_log == NULL) {
+        return;
+    }
+
+    mp = nxt_mp_create(1024, 128, 256, 32);
+    if (nxt_slow_path(mp == NULL)) {
+        return;
+    }
+
+    reopen = nxt_mp_get(mp, sizeof(nxt_router_access_log_reopen_t));
+    if (nxt_slow_path(reopen == NULL)) {
+        goto fail;
+    }
+
+    reopen->mem_pool = mp;
+    reopen->access_log = access_log;
+
+    b = nxt_buf_mem_alloc(mp, access_log->path.length + 1, 0);
+    if (nxt_slow_path(b == NULL)) {
+        goto fail;
+    }
+
+    b->completion_handler = nxt_router_access_log_reopen_completion;
+
+    nxt_buf_cpystr(b, &access_log->path);
+    *b->mem.free++ = '\0';
+
+    rt = task->thread->runtime;
+    main_port = rt->port_by_type[NXT_PROCESS_MAIN];
+    router_port = rt->port_by_type[NXT_PROCESS_ROUTER];
+
+    stream = nxt_port_rpc_register_handler(task, router_port,
+                                           nxt_router_access_log_reopen_ready,
+                                           nxt_router_access_log_reopen_error,
+                                           -1, reopen);
+    if (nxt_slow_path(stream == 0)) {
+        goto fail;
+    }
+
+    ret = nxt_port_socket_write(task, main_port, NXT_PORT_MSG_ACCESS_LOG, -1,
+                                stream, router_port->id, b);
+
+    if (nxt_slow_path(ret != NXT_OK)) {
+        nxt_port_rpc_cancel(task, router_port, stream);
+        goto fail;
+    }
+
+    nxt_mp_retain(mp);
+
+    return;
+
+fail:
+
+    nxt_mp_destroy(mp);
+}
+
+
+static void
+nxt_router_access_log_reopen_completion(nxt_task_t *task, void *obj, void *data)
+{
+    nxt_mp_t   *mp;
+    nxt_buf_t  *b;
+
+    b = obj;
+    mp = b->data;
+
+    nxt_mp_release(mp);
+}
+
+
+static void
+nxt_router_access_log_reopen_ready(nxt_task_t *task, nxt_port_recv_msg_t *msg,
+    void *data)
+{
+    nxt_router_access_log_t         *access_log;
+    nxt_router_access_log_reopen_t  *reopen;
+
+    reopen = data;
+
+    access_log = reopen->access_log;
+
+    if (access_log == nxt_router->access_log) {
+
+        if (nxt_slow_path(dup2(msg->fd[0], access_log->fd) == -1)) {
+            nxt_alert(task, "dup2(%FD, %FD) failed %E",
+                      msg->fd[0], access_log->fd, nxt_errno);
+        }
+    }
+
+    nxt_fd_close(msg->fd[0]);
+    nxt_mp_release(reopen->mem_pool);
+}
+
+
+static void
+nxt_router_access_log_reopen_error(nxt_task_t *task, nxt_port_recv_msg_t *msg,
+    void *data)
+{
+    nxt_router_access_log_reopen_t  *reopen;
+
+    reopen = data;
+
+    nxt_mp_release(reopen->mem_pool);
+}