Add review suggestions

Signed-off-by: Norbert Heusser <norbert.heusser@cedalo.com>

Author: NorbertHeusser

src/uv_tcp_connect.c

@@ -32,9 +32,9 @@ struct uvTcpConnect
     struct uv_getaddrinfo_s getaddrinfo; /* DNS resolve request */
     struct uv_connect_s connect;         /* TCP connection request */
     struct uv_write_s write;             /* TCP handshake request */
-    uv_check_t delayedtcpclose;          /* A check handle required to delay closing tcp */
     int status;                          /* Returned to the request callback */
-    queue queue;                         /* Pending connect queue */
+    bool resolving; /* Indicate name resolving in progress */
+    queue queue;    /* Pending connect queue */
 };
 
 /* Encode an handshake message into the given buffer. */
@@ -66,7 +66,6 @@ static void uvTcpConnectFinish(struct uvTcpConnect *connect)
     struct raft_uv_connect *req = connect->req;
     int status = connect->status;
     QUEUE_REMOVE(&connect->queue);
-    uv_close((struct uv_handle_s *)&connect->delayedtcpclose, NULL);
     RaftHeapFree(connect->handshake.base);
     uv_freeaddrinfo(connect->getaddrinfo.addrinfo);
     raft_free(connect);
@@ -87,27 +86,16 @@ static void uvTcpConnectUvCloseCb(struct uv_handle_s *handle)
     UvTcpMaybeFireCloseCb(t);
 }
 
-static void uvTcpConnectCheckMayClose(uv_check_t *handle)
-{
-    struct uvTcpConnect *connect = handle->data;
-    if (connect->status || uv_is_active((uv_handle_t *)connect->tcp)) {
-        uv_check_stop(&connect->delayedtcpclose);
-        uv_close((struct uv_handle_s *)connect->tcp, uvTcpConnectUvCloseCb);
-    }
-}
-
 /* Abort a connection request. */
 static void uvTcpConnectAbort(struct uvTcpConnect *connect)
 {
     QUEUE_REMOVE(&connect->queue);
     QUEUE_PUSH(&connect->t->aborting, &connect->queue);
-    if (uv_cancel((struct uv_req_s *)&connect->getaddrinfo) == 0 ||
-        !uv_is_active((uv_handle_t *)connect->tcp)) {
-        /* If canceling the addrinfo call was not successfull, but the tcp
-           handle is not active the getaddrinfo is in progress and we need to
-           delay closing the tcp handle until it's finished */
-        uv_check_start(&connect->delayedtcpclose, uvTcpConnectCheckMayClose);
-    } else {
+    uv_cancel((struct uv_req_s *)&connect->getaddrinfo);
+    /* Call uv_close on the tcp handle, if there is no getaddrinfo request
+in flight. Data structures may only be freed after the uvGetAddrInfoCb was
+triggered. Tcp handle will be closed in the uvGetAddrInfoCb in this case. */
+    if (!connect->resolving) {
         uv_close((struct uv_handle_s *)connect->tcp, uvTcpConnectUvCloseCb);
     }
 }
@@ -167,6 +155,7 @@ static void uvTcpConnectUvConnectCb(struct uv_connect_s *req, int status)
     uvTcpConnectAbort(connect);
 }
 
+/* The hostname resolve is finished */
 static void uvGetAddrInfoCb(uv_getaddrinfo_t *req,
                             int status,
                             struct addrinfo *res)
@@ -175,8 +164,14 @@ static void uvGetAddrInfoCb(uv_getaddrinfo_t *req,
     struct UvTcp *t = connect->t;
     int rv;
 
-    if (t->closing || status == UV_ECANCELED) {
+    connect->resolving =
+        false; /* Indicate we are in the name resolving phase */
+
+    if (t->closing) {
         connect->status = RAFT_CANCELED;
+
+        /* We need to close the tcp handle to to connection attempt */
+        uv_close((struct uv_handle_s *)connect->tcp, uvTcpConnectUvCloseCb);
         return;
     }
 
@@ -233,9 +228,6 @@ static int uvTcpConnectStart(struct uvTcpConnect *r, const char *address)
         goto err;
     }
 
-    rv = uv_check_init(t->loop, &r->delayedtcpclose);
-    assert(rv == 0);
-
     rv = uv_tcp_init(r->t->loop, r->tcp);
     assert(rv == 0);
     r->tcp->data = r;
@@ -258,12 +250,12 @@ static int uvTcpConnectStart(struct uvTcpConnect *r, const char *address)
         rv = RAFT_NOCONNECTION;
         goto err_after_tcp_init;
     }
+    r->resolving = true; /* Indicate we are in the name resolving phase */
 
     return 0;
 
 err_after_tcp_init:
     uv_close((uv_handle_t *)r->tcp, (uv_close_cb)RaftHeapFree);
-    uv_close((uv_handle_t *)&r->delayedtcpclose, NULL);
 
 err:
     RaftHeapFree(r->handshake.base);
@@ -295,8 +287,8 @@ int UvTcpConnect(struct raft_uv_transport *transport,
     r->status = 0;
     r->write.data = r;
     r->getaddrinfo.data = r;
+    r->resolving = false;
     r->connect.data = r;
-    r->delayedtcpclose.data = r;
     req->cb = cb;
 
     /* Keep track of the pending request */