Added basic HTTP request processing in router.

- request to connection mapping in engine;
- requests queue in connection;
- engine port creation;
- connected ports hash for each process;
- engine port data messages processing (app responses);

9 files changed, 563 insertions, 33 deletions

diff --git a/src/nxt_conn.c b/src/nxt_conn.c
index bba2bfd1..0cc052e8 100644
--- a/src/nxt_conn.c
+++ b/src/nxt_conn.c
@@ -85,6 +85,8 @@ nxt_conn_create(nxt_mp_t *mp, nxt_task_t *task)
     nxt_conn_timer_init(&c->read_timer, c, c->socket.read_work_queue);
     nxt_conn_timer_init(&c->write_timer, c, c->socket.write_work_queue);
 
+    nxt_queue_init(&c->requests);
+
     nxt_log_debug(&c->log, "connections: %uD", thr->engine->connections);
 
     return c;
@@ -150,3 +152,35 @@ nxt_conn_work_queue_set(nxt_conn_t *c, nxt_work_queue_t *wq)
     c->read_timer.work_queue = wq;
     c->write_timer.work_queue = wq;
 }
+
+
+nxt_req_conn_link_t *
+nxt_conn_request_add(nxt_conn_t *c, nxt_req_id_t req_id)
+{
+    nxt_req_conn_link_t  *rc;
+
+    rc = nxt_mp_zalloc(c->mem_pool, sizeof(nxt_req_conn_link_t));
+    if (nxt_slow_path(rc == NULL)) {
+        nxt_thread_log_error(NXT_LOG_WARN, "failed to allocate req %08uxD "
+                             "to conn", req_id);
+        return NULL;
+    }
+
+    rc->req_id = req_id;
+    rc->conn = c;
+
+    nxt_queue_insert_tail(&c->requests, &rc->link);
+
+    return rc;
+}
+
+
+void
+nxt_conn_request_remove(nxt_conn_t *c, nxt_req_conn_link_t *rc)
+{
+    nxt_queue_remove(&rc->link);
+
+    nxt_mp_free(c->mem_pool, rc);
+}
+
+
diff --git a/src/nxt_conn.h b/src/nxt_conn.h
index 479450bb..6c4de090 100644
--- a/src/nxt_conn.h
+++ b/src/nxt_conn.h
@@ -141,6 +141,8 @@ struct nxt_conn_s {
 
     nxt_conn_io_t                 *io;
 
+    nxt_queue_t                   requests; /* of nxt_req_conn_link_t */
+
 #if (NXT_SSLTLS || NXT_THREADS)
     /* SunC does not support "zero-sized struct/union". */
 
@@ -180,6 +182,16 @@ struct nxt_conn_s {
 };
 
 
+typedef uint32_t nxt_req_id_t;
+
+typedef struct {
+    nxt_req_id_t      req_id;
+    nxt_conn_t        *conn;
+
+    nxt_queue_link_t  link;
+} nxt_req_conn_link_t;
+
+
 #define nxt_conn_timer_init(ev, c, wq)                                        \
     do {                                                                      \
         (ev)->work_queue = (wq);                                              \
@@ -347,4 +359,10 @@ NXT_EXPORT void nxt_conn_proxy(nxt_task_t *task, nxt_conn_proxy_t *p);
 #define nxt_event_conn_close     nxt_conn_close
 
 
+NXT_EXPORT nxt_req_conn_link_t *nxt_conn_request_add(nxt_conn_t *c,
+    nxt_req_id_t req_id);
+NXT_EXPORT void nxt_conn_request_remove(nxt_conn_t *c,
+    nxt_req_conn_link_t *rc);
+
+
 #endif /* _NXT_CONN_H_INCLUDED_ */
diff --git a/src/nxt_event_engine.c b/src/nxt_event_engine.c
index d636dc25..9171bcd6 100644
--- a/src/nxt_event_engine.c
+++ b/src/nxt_event_engine.c
@@ -544,3 +544,115 @@ nxt_event_engine_start(nxt_event_engine_t *engine)
         nxt_timer_expire(engine, now);
     }
 }
+
+
+static nxt_int_t
+nxt_req_conn_test(nxt_lvlhsh_query_t *lhq, void *data)
+{
+    return NXT_OK;
+}
+
+static const nxt_lvlhsh_proto_t  lvlhsh_req_conn_proto  nxt_aligned(64) = {
+    NXT_LVLHSH_DEFAULT,
+    nxt_req_conn_test,
+    nxt_lvlhsh_alloc,
+    nxt_lvlhsh_free,
+};
+
+
+void
+nxt_event_engine_request_add(nxt_event_engine_t *engine,
+    nxt_req_conn_link_t *rc)
+{
+    nxt_lvlhsh_query_t  lhq;
+
+    lhq.key_hash = nxt_murmur_hash2(&rc->req_id, sizeof(rc->req_id));
+    lhq.key.length = sizeof(rc->req_id);
+    lhq.key.start = (u_char *) &rc->req_id;
+    lhq.proto = &lvlhsh_req_conn_proto;
+    lhq.replace = 0;
+    lhq.value = rc;
+    lhq.pool = engine->mem_pool;
+
+    switch (nxt_lvlhsh_insert(&engine->requests, &lhq)) {
+
+    case NXT_OK:
+        break;
+
+    default:
+        nxt_thread_log_error(NXT_LOG_WARN, "req %08uxD to conn add failed",
+                             rc->req_id);
+        break;
+    }
+}
+
+
+nxt_req_conn_link_t *
+nxt_event_engine_request_find(nxt_event_engine_t *engine, nxt_req_id_t req_id)
+{
+    nxt_lvlhsh_query_t  lhq;
+
+    lhq.key_hash = nxt_murmur_hash2(&req_id, sizeof(req_id));
+    lhq.key.length = sizeof(req_id);
+    lhq.key.start = (u_char *) &req_id;
+    lhq.proto = &lvlhsh_req_conn_proto;
+
+    if (nxt_lvlhsh_find(&engine->requests, &lhq) == NXT_OK) {
+        return lhq.value;
+    }
+
+    return NULL;
+}
+
+
+void
+nxt_event_engine_request_remove(nxt_event_engine_t *engine,
+    nxt_req_conn_link_t *rc)
+{
+    nxt_lvlhsh_query_t  lhq;
+
+    lhq.key_hash = nxt_murmur_hash2(&rc->req_id, sizeof(rc->req_id));
+    lhq.key.length = sizeof(rc->req_id);
+    lhq.key.start = (u_char *) &rc->req_id;
+    lhq.proto = &lvlhsh_req_conn_proto;
+    lhq.pool = engine->mem_pool;
+
+    switch (nxt_lvlhsh_delete(&engine->requests, &lhq)) {
+
+    case NXT_OK:
+        break;
+
+    default:
+        nxt_thread_log_error(NXT_LOG_WARN, "req %08uxD to conn remove failed",
+                             rc->req_id);
+        break;
+    }
+}
+
+
+nxt_req_conn_link_t *
+nxt_event_engine_request_find_remove(nxt_event_engine_t *engine,
+    nxt_req_id_t req_id)
+{
+    nxt_lvlhsh_query_t  lhq;
+
+    lhq.key_hash = nxt_murmur_hash2(&req_id, sizeof(req_id));
+    lhq.key.length = sizeof(req_id);
+    lhq.key.start = (u_char *) &req_id;
+    lhq.proto = &lvlhsh_req_conn_proto;
+    lhq.pool = engine->mem_pool;
+
+    switch (nxt_lvlhsh_delete(&engine->requests, &lhq)) {
+
+    case NXT_OK:
+        return lhq.value;
+
+    default:
+        nxt_thread_log_error(NXT_LOG_WARN, "req %08uxD to conn remove failed",
+                             req_id);
+        break;
+    }
+
+    return NULL;
+}
+
diff --git a/src/nxt_event_engine.h b/src/nxt_event_engine.h
index d58949ba..ceb1654e 100644
--- a/src/nxt_event_engine.h
+++ b/src/nxt_event_engine.h
@@ -491,6 +491,7 @@ struct nxt_event_engine_s {
     nxt_queue_t                joints;
     nxt_queue_t                listen_connections;
     nxt_queue_t                idle_connections;
+    nxt_lvlhsh_t               requests; /* req_id to nxt_req_conn_link_t */
 
     nxt_queue_link_t           link;
 };
@@ -509,6 +510,15 @@ NXT_EXPORT void nxt_event_engine_post(nxt_event_engine_t *engine,
 NXT_EXPORT void nxt_event_engine_signal(nxt_event_engine_t *engine,
     nxt_uint_t signo);
 
+NXT_EXPORT void nxt_event_engine_request_add(nxt_event_engine_t *engine,
+    nxt_req_conn_link_t *rc);
+NXT_EXPORT nxt_req_conn_link_t *nxt_event_engine_request_find(
+    nxt_event_engine_t *engine, nxt_req_id_t req_id);
+NXT_EXPORT void nxt_event_engine_request_remove(nxt_event_engine_t *engine,
+    nxt_req_conn_link_t *rc);
+NXT_EXPORT nxt_req_conn_link_t *nxt_event_engine_request_find_remove(
+    nxt_event_engine_t *engine, nxt_req_id_t req_id);
+
 
 nxt_inline nxt_event_engine_t *
 nxt_thread_event_engine(void)
diff --git a/src/nxt_main.h b/src/nxt_main.h
index 0aa2192c..4b9a9036 100644
--- a/src/nxt_main.h
+++ b/src/nxt_main.h
@@ -26,7 +26,6 @@ typedef struct nxt_runtime_s         nxt_runtime_t;
 typedef uint16_t                     nxt_port_id_t;
 
 #include <nxt_queue.h>
-#include <nxt_process.h>
 
 typedef struct nxt_thread_s          nxt_thread_t;
 #include <nxt_thread_id.h>
@@ -36,6 +35,8 @@ typedef struct nxt_thread_s          nxt_thread_t;
 
 #include <nxt_random.h>
 #include <nxt_string.h>
+#include <nxt_lvlhsh.h>
+#include <nxt_process.h>
 #include <nxt_utf8.h>
 #include <nxt_file_name.h>
 
@@ -90,7 +91,6 @@ typedef struct nxt_thread_pool_s     nxt_thread_pool_t;
 
 #include <nxt_djb_hash.h>
 #include <nxt_murmur_hash.h>
-#include <nxt_lvlhsh.h>
 #include <nxt_hash.h>
 
 #include <nxt_sort.h>
diff --git a/src/nxt_port.c b/src/nxt_port.c
index eb320640..91f0fe31 100644
--- a/src/nxt_port.c
+++ b/src/nxt_port.c
@@ -142,8 +142,6 @@ nxt_port_new_port_buf_completion(nxt_task_t *task, void *obj, void *data)
     b = obj;
     mp = b->data;
 
-    /* TODO: b->mem.pos */
-
     nxt_buf_free(mp, b);
 }
 
diff --git a/src/nxt_process.c b/src/nxt_process.c
index ce16cf7f..33af310d 100644
--- a/src/nxt_process.c
+++ b/src/nxt_process.c
@@ -540,3 +540,29 @@ nxt_process_port_new(nxt_process_t *process)
     return port;
 }
 
+
+void
+nxt_process_connected_port_add(nxt_process_t *process, nxt_port_t *port)
+{
+    /* TODO lock ports */
+
+    nxt_port_hash_add(&process->connected_ports, process->mem_pool, port);
+}
+
+void
+nxt_process_connected_port_remove(nxt_process_t *process, nxt_port_t *port)
+{
+    /* TODO lock ports */
+
+    nxt_port_hash_remove(&process->connected_ports, process->mem_pool, port);
+}
+
+nxt_port_t *
+nxt_process_connected_port_find(nxt_process_t *process, nxt_pid_t pid,
+    nxt_port_id_t port_id)
+{
+    /* TODO lock ports */
+
+    return nxt_port_hash_find(&process->connected_ports, pid, port_id);
+}
+
diff --git a/src/nxt_process.h b/src/nxt_process.h
index 669c8f03..32a8d8dc 100644
--- a/src/nxt_process.h
+++ b/src/nxt_process.h
@@ -58,6 +58,8 @@ typedef struct {
     nxt_process_init_t  *init;
     nxt_array_t         *incoming;  /* of nxt_mmap_t */
     nxt_array_t         *outgoing;  /* of nxt_mmap_t */
+
+    nxt_lvlhsh_t        connected_ports; /* of nxt_port_t */
 } nxt_process_t;
 
 
@@ -88,6 +90,16 @@ NXT_EXPORT nxt_port_t * nxt_process_port_new(nxt_process_t *process);
 #define nxt_process_port_loop                                                 \
     nxt_queue_loop
 
+
+void nxt_process_connected_port_add(nxt_process_t *process, nxt_port_t *port);
+
+void nxt_process_connected_port_remove(nxt_process_t *process,
+    nxt_port_t *port);
+
+nxt_port_t *nxt_process_connected_port_find(nxt_process_t *process,
+    nxt_pid_t pid, nxt_port_id_t port_id);
+
+
 #if (NXT_HAVE_SETPROCTITLE)
 
 #define nxt_process_title(task, fmt, ...)                                     \
diff --git a/src/nxt_router.c b/src/nxt_router.c
index 75edba40..d55862f7 100644
--- a/src/nxt_router.c
+++ b/src/nxt_router.c
@@ -6,6 +6,7 @@
  */
 
 #include <nxt_router.h>
+#include <nxt_application.h>
 
 
 static nxt_router_temp_conf_t *nxt_router_temp_conf(nxt_task_t *task,
@@ -64,6 +65,9 @@ static void nxt_router_conf_release(nxt_task_t *task,
 static void nxt_router_conn_init(nxt_task_t *task, void *obj, void *data);
 static void nxt_router_conn_http_header_parse(nxt_task_t *task, void *obj,
     void *data);
+static void nxt_router_process_http_request(nxt_task_t *task,
+    nxt_conn_t *c, nxt_app_parse_ctx_t *ap);
+static void nxt_router_conn_ready(nxt_task_t *task, void *obj, void *data);
 static void nxt_router_conn_close(nxt_task_t *task, void *obj, void *data);
 static void nxt_router_conn_free(nxt_task_t *task, void *obj, void *data);
 static void nxt_router_conn_error(nxt_task_t *task, void *obj, void *data);
@@ -79,6 +83,11 @@ nxt_router_start(nxt_task_t *task, nxt_runtime_t *rt)
     nxt_router_temp_conf_t       *tmcf;
     const nxt_event_interface_t  *interface;
 
+    ret = nxt_app_http_init(task, rt);
+    if (nxt_slow_path(ret != NXT_OK)) {
+        return ret;
+    }
+
     router = nxt_zalloc(sizeof(nxt_router_t));
     if (nxt_slow_path(router == NULL)) {
         return NXT_ERROR;
@@ -519,6 +528,7 @@ nxt_router_engine_joints_create(nxt_task_t *task, nxt_mp_t *mp,
 
         joint->count = 1;
         joint->socket_conf = nxt_queue_link_data(qlk, nxt_socket_conf_t, link);
+        joint->engine = recf->engine;
     }
 
     return NXT_OK;
@@ -578,7 +588,10 @@ static nxt_int_t
 nxt_router_thread_create(nxt_task_t *task, nxt_runtime_t *rt,
     nxt_event_engine_t *engine)
 {
+    nxt_mp_t             *mp;
     nxt_int_t            ret;
+    nxt_port_t           *port;
+    nxt_process_t        *process;
     nxt_thread_link_t    *link;
     nxt_thread_handle_t  handle;
 
@@ -596,6 +609,36 @@ nxt_router_thread_create(nxt_task_t *task, nxt_runtime_t *rt,
 
     nxt_queue_insert_tail(&rt->engines, &engine->link);
 
+
+    process = nxt_runtime_process_find(rt, nxt_pid);
+    if (nxt_slow_path(process == NULL)) {
+        return NXT_ERROR;
+    }
+
+    port = nxt_process_port_new(process);
+    if (nxt_slow_path(port == NULL)) {
+        return NXT_ERROR;
+    }
+
+    ret = nxt_port_socket_init(task, port, 0);
+    if (nxt_slow_path(ret != NXT_OK)) {
+        return ret;
+    }
+
+    mp = nxt_mp_create(1024, 128, 256, 32);
+    if (nxt_slow_path(mp == NULL)) {
+        return NXT_ERROR;
+    }
+
+    port->mem_pool = mp;
+    port->engine = 0;
+    port->type = NXT_PROCESS_ROUTER;
+
+    engine->port = port;
+
+    nxt_runtime_port_add(rt, port);
+
+
     ret = nxt_thread_create(&handle, link);
 
     if (nxt_slow_path(ret != NXT_OK)) {
@@ -637,14 +680,28 @@ nxt_router_engine_post(nxt_router_engine_conf_t *recf)
 
 
 static void
+nxt_router_data_handler(nxt_task_t *task, nxt_port_recv_msg_t *msg);
+
+nxt_port_handler_t  nxt_router_process_port_handlers[] = {
+    NULL,
+    nxt_port_new_port_handler,
+    nxt_port_change_log_file_handler,
+    nxt_port_mmap_handler,
+    nxt_router_data_handler,
+};
+
+
+static void
 nxt_router_thread_start(void *data)
 {
+    nxt_task_t          *task;
     nxt_thread_t        *thread;
     nxt_thread_link_t   *link;
     nxt_event_engine_t  *engine;
 
     link = data;
     engine = link->engine;
+    task = &engine->task;
 
     thread = nxt_thread();
 
@@ -657,6 +714,9 @@ nxt_router_thread_start(void *data)
     thread->task = &engine->task;
     thread->fiber = &engine->fibers->fiber;
 
+    engine->port->socket.task = task;
+    nxt_port_create(task, engine->port, nxt_router_process_port_handlers);
+
     engine->mem_pool = nxt_mp_create(4096, 128, 1024, 64);
 
     nxt_event_engine_start(engine);
@@ -913,51 +973,159 @@ nxt_router_conn_init(nxt_task_t *task, void *obj, void *data)
 static const nxt_conn_state_t  nxt_router_conn_write_state
     nxt_aligned(64) =
 {
-    .ready_handler = nxt_router_conn_close,
+    .ready_handler = nxt_router_conn_ready,
     .close_handler = nxt_router_conn_close,
     .error_handler = nxt_router_conn_error,
 };
 
 
 static void
+nxt_router_data_handler(nxt_task_t *task, nxt_port_recv_msg_t *msg)
+{
+    size_t               dump_size;
+    nxt_buf_t            *b, *i, *last;
+    nxt_conn_t           *c;
+    nxt_work_queue_t     *wq;
+    nxt_req_conn_link_t  *rc;
+    nxt_event_engine_t   *engine;
+
+    b = msg->buf;
+    engine = task->thread->engine;
+    wq = &engine->fast_work_queue;
+
+    rc = nxt_event_engine_request_find(engine, msg->port_msg.stream);
+    if (nxt_slow_path(rc == NULL)) {
+
+        nxt_debug(task, "request id %08uxD not found", msg->port_msg.stream);
+
+        /* complete buffer(s) */
+        for (i = b; i != NULL; i = i->next) {
+            i->mem.pos = i->mem.free;
+
+            nxt_work_queue_add(wq, i->completion_handler, task, i, i->parent);
+        }
+
+        return;
+    }
+
+    c = rc->conn;
+
+    dump_size = nxt_buf_used_size(b);
+
+    if (dump_size > 300) {
+        dump_size = 300;
+    }
+
+    nxt_debug(task, "%srouter data (%z): %*s",
+              msg->port_msg.last ? "last " : "", msg->size, dump_size,
+              b->mem.pos);
+
+    if (msg->size == 0) {
+        b = NULL;
+    }
+
+    if (msg->port_msg.last != 0) {
+        nxt_debug(task, "router data create last buf");
+
+        last = nxt_buf_sync_alloc(c->mem_pool, NXT_BUF_SYNC_LAST);
+        if (nxt_slow_path(last == NULL)) {
+            /* TODO pogorevaTb */
+        }
+
+        nxt_buf_chain_add(&b, last);
+    }
+
+    if (b == NULL) {
+        return;
+    }
+
+    if (c->write == NULL) {
+        c->write = b;
+        c->write_state = &nxt_router_conn_write_state;
+
+        nxt_conn_write(task->thread->engine, c);
+    } else {
+        nxt_debug(task, "router data attach out bufs to existing chain");
+
+        nxt_buf_chain_add(&c->write, b);
+    }
+}
+
+
+nxt_inline nxt_port_t *
+nxt_router_app_port(nxt_task_t *task)
+{
+      nxt_port_t     *port;
+      nxt_runtime_t  *rt;
+
+      rt = task->thread->runtime;
+
+      nxt_runtime_port_each(rt, port) {
+
+          if (nxt_pid == port->pid) {
+              continue;
+          }
+
+          if (port->type == NXT_PROCESS_WORKER) {
+              return port;
+          }
+
+      } nxt_runtime_port_loop;
+
+      return NULL;
+}
+
+
+static void
 nxt_router_conn_http_header_parse(nxt_task_t *task, void *obj, void *data)
 {
-    size_t                    size;
+    size_t                    size, preread;
     nxt_int_t                 ret;
     nxt_buf_t                 *b;
     nxt_conn_t                *c;
+    nxt_app_parse_ctx_t       *ap;
     nxt_socket_conf_joint_t   *joint;
-    nxt_http_request_parse_t  *rp;
+    nxt_app_request_header_t  *h;
 
     c = obj;
-    rp = data;
+    ap = data;
+    b = c->read;
 
     nxt_debug(task, "router conn http header parse");
 
-    if (rp == NULL) {
-        rp = nxt_mp_zget(c->mem_pool, sizeof(nxt_http_request_parse_t));
-        if (nxt_slow_path(rp == NULL)) {
+    if (ap == NULL) {
+        ap = nxt_mp_zget(c->mem_pool, sizeof(nxt_app_parse_ctx_t));
+        if (nxt_slow_path(ap == NULL)) {
             nxt_router_conn_close(task, c, data);
             return;
         }
 
-        c->socket.data = rp;
-
-        ret = nxt_http_parse_request_init(rp, c->mem_pool);
+        ret = nxt_app_http_req_init(task, ap);
         if (nxt_slow_path(ret != NXT_OK)) {
             nxt_router_conn_close(task, c, data);
             return;
         }
+
+        c->socket.data = ap;
     }
 
-    ret = nxt_http_parse_request(rp, &c->read->mem);
+    h = &ap->r.header;
+
+    ret = nxt_app_http_req_parse(task, ap, b);
 
     nxt_debug(task, "http parse request: %d", ret);
 
     switch (nxt_expect(NXT_DONE, ret)) {
 
     case NXT_DONE:
-        break;
+        preread = nxt_buf_mem_used_size(&b->mem);
+
+        nxt_debug(task, "router request header parsing complete, "
+                  "content length: %O, preread: %uz",
+                  h->parsed_content_length, preread);
+
+        nxt_router_process_http_request(task, c, ap);
+        return;
 
     case NXT_ERROR:
         nxt_router_conn_close(task, c, data);
@@ -965,32 +1133,122 @@ nxt_router_conn_http_header_parse(nxt_task_t *task, void *obj, void *data)
 
     default:  /* NXT_AGAIN */
 
-        if (c->read->mem.free == c->read->mem.end) {
-            joint = c->listen->socket.data;
-            size = joint->socket_conf->large_header_buffer_size,
+        if (h->done == 0) {
+
+            if (c->read->mem.free == c->read->mem.end) {
+                joint = c->listen->socket.data;
+                size = joint->socket_conf->large_header_buffer_size;
+
+                if (size > (size_t) nxt_buf_mem_size(&b->mem)) {
+                    b = nxt_buf_mem_alloc(c->mem_pool, size, 0);
+                    if (nxt_slow_path(b == NULL)) {
+                        nxt_router_conn_close(task, c, data);
+                        return;
+                    }
+
+                    size = c->read->mem.free - c->read->mem.pos;
+                    nxt_memcpy(b->mem.pos, c->read->mem.pos, size);
 
-            b = nxt_buf_mem_alloc(c->mem_pool, size, 0);
-            if (nxt_slow_path(b == NULL)) {
-                nxt_router_conn_close(task, c, data);
-                return;
+                    b->mem.free += size;
+                    c->read = b;
+                } else {
+                    // TODO 500 Too long request headers
+                    nxt_log_alert(task->log, "Too long request headers");
+                }
             }
+        }
+
+        if (ap->r.body.done == 0) {
+
+            preread = nxt_buf_mem_used_size(&b->mem);
+
+            if (h->parsed_content_length - preread >
+                (size_t) nxt_buf_mem_free_size(&b->mem)) {
+
+                b = nxt_buf_mem_alloc(c->mem_pool, h->parsed_content_length, 0);
+                if (nxt_slow_path(b == NULL)) {
+                    // TODO 500 Failed to allocate buffer for request body
+                    nxt_log_alert(task->log, "Failed to allocate buffer for "
+                                  "request body");
+                }
 
-            size = c->read->mem.free - c->read->mem.pos;
-            nxt_memcpy(b->mem.pos, c->read->mem.pos, size);
+                b->mem.free = nxt_cpymem(b->mem.free, c->read->mem.pos,
+                                         preread);
+
+                c->read = b;
+            }
+
+            nxt_debug(task, "router request body read again, rest: %uz",
+                      h->parsed_content_length - preread);
 
-            b->mem.free += size;
-            c->read = b;
         }
 
-        nxt_conn_read(task->thread->engine, c);
-        return;
     }
 
-    c->write = c->read;
-    c->write->mem.pos = c->write->mem.start;
-    c->write_state = &nxt_router_conn_write_state;
+    nxt_conn_read(task->thread->engine, c);
+}
+
+
+static void
+nxt_router_process_http_request(nxt_task_t *task, nxt_conn_t *c,
+    nxt_app_parse_ctx_t *ap)
+{
+    nxt_port_t           *port, *c_port;
+    nxt_req_id_t         req_id;
+    nxt_app_wmsg_t       wmsg;
+    nxt_event_engine_t   *engine;
+    nxt_req_conn_link_t  *rc;
+
+    if (nxt_slow_path(nxt_app == NULL)) {
+        // 500 Application not found
+        nxt_log_alert(task->log, "application is NULL");
+    }
+
+    port = nxt_router_app_port(task);
+
+    if (nxt_slow_path(port == NULL)) {
+        // 500 Application port not found
+        nxt_log_alert(task->log, "application port not found");
+    }
+
+    engine = task->thread->engine;
+
+    do {
+        req_id = nxt_random(&nxt_random_data);
+    } while (nxt_event_engine_request_find(engine, req_id) != NULL);
+
+    rc = nxt_conn_request_add(c, req_id);
+    if (nxt_slow_path(rc == NULL)) {
+        // 500 Failed to allocate req->conn link
+        nxt_log_alert(task->log, "failed to allocate req->conn link");
+    }
+
+    nxt_event_engine_request_add(engine, rc);
+
+    nxt_debug(task, "req_id %uxD linked to conn %p at engine %p",
+              req_id, c, engine);
 
-    nxt_conn_write(task->thread->engine, c);
+    c_port = nxt_process_connected_port_find(port->process,
+                                             engine->port->pid,
+                                             engine->port->id);
+    if (nxt_slow_path(c_port != engine->port)) {
+        (void) nxt_port_send_port(task, port, engine->port);
+        nxt_process_connected_port_add(port->process, engine->port);
+    }
+
+    wmsg.port = port;
+    wmsg.write = NULL;
+    wmsg.buf = &wmsg.write;
+    wmsg.stream = req_id;
+
+    (void)nxt_app->prepare_msg(task, &ap->r, &wmsg);
+
+    nxt_debug(task, "about to send %d bytes buffer to worker port %d",
+                    nxt_buf_used_size(wmsg.write),
+                    wmsg.port->socket.fd);
+
+    (void) nxt_port_socket_write(task, wmsg.port, NXT_PORT_MSG_DATA,
+                                 -1, req_id, engine->port->id, wmsg.write);
 }
 
 
@@ -1002,6 +1260,59 @@ static const nxt_conn_state_t  nxt_router_conn_close_state
 
 
 static void
+nxt_router_conn_ready(nxt_task_t *task, void *obj, void *data)
+{
+    nxt_buf_t         *b;
+    nxt_bool_t        last;
+    nxt_conn_t        *c;
+    nxt_work_queue_t  *wq;
+
+    nxt_debug(task, "router conn ready %p", obj);
+
+    c = obj;
+    b = c->write;
+
+    wq = &task->thread->engine->fast_work_queue;
+
+    last = 0;
+
+    while (b != NULL) {
+        if (!nxt_buf_is_sync(b)) {
+            if (nxt_buf_used_size(b) > 0) {
+                break;
+            }
+        }
+
+        if (nxt_buf_is_last(b)) {
+            last = 1;
+        }
+
+        nxt_work_queue_add(wq, b->completion_handler, task, b, b->parent);
+
+        b = b->next;
+    }
+
+    c->write = b;
+
+    if (b != NULL) {
+        nxt_debug(task, "router conn %p has more data to write", obj);
+
+        nxt_conn_write(task->thread->engine, c);
+    } else {
+        nxt_debug(task, "router conn %p no more data to write, last = %d", obj,
+                  last);
+
+        if (last != 0) {
+            nxt_debug(task, "enqueue router conn close %p (ready handler)", c);
+
+            nxt_work_queue_add(wq, nxt_router_conn_close, task, c,
+                               c->socket.data);
+        }
+    }
+}
+
+
+static void
 nxt_router_conn_close(nxt_task_t *task, void *obj, void *data)
 {
     nxt_conn_t  *c;
@@ -1020,6 +1331,7 @@ static void
 nxt_router_conn_free(nxt_task_t *task, void *obj, void *data)
 {
     nxt_conn_t               *c;
+    nxt_req_conn_link_t      *rc;
     nxt_socket_conf_joint_t  *joint;
 
     c = obj;
@@ -1029,6 +1341,14 @@ nxt_router_conn_free(nxt_task_t *task, void *obj, void *data)
     joint = c->listen->socket.data;
     nxt_router_conf_release(task, joint);
 
+    nxt_queue_each(rc, &c->requests, nxt_req_conn_link_t, link) {
+
+        nxt_debug(task, "conn %p close, req %uxD", c, rc->req_id);
+
+        nxt_event_engine_request_remove(task->thread->engine, rc);
+
+    } nxt_queue_loop;
+
     nxt_mp_destroy(c->mem_pool);
 }