[Asterisk-code-review] res_http_websocket: Add a client connection timeout (asterisk[16])

[Kevin Harwell]

Kevin Harwell has uploaded this change for review. ( https://gerrit.asterisk.org/c/asterisk/+/17925 )


Change subject: res_http_websocket: Add a client connection timeout
......................................................................

res_http_websocket: Add a client connection timeout

Previously there was no way to specify a connection timeout when
attempting to connect a websocket client to a server. This patch
makes it possible to now do such.

Change-Id: I5812f6f28d3d13adbc246517f87af177fa20ee9d
---
M include/asterisk/http_websocket.h
M res/res_http_websocket.c
2 files changed, 71 insertions(+), 11 deletions(-)



  git pull ssh://gerrit.asterisk.org:29418/asterisk refs/changes/25/17925/1

diff --git a/include/asterisk/http_websocket.h b/include/asterisk/http_websocket.h
index 2a55e60..ee7f9b8 100644
--- a/include/asterisk/http_websocket.h
+++ b/include/asterisk/http_websocket.h
@@ -441,6 +441,55 @@
 		  enum ast_websocket_result *result), { return NULL;});
 
 /*!
+ * \brief Options used for a websocket client
+ */
+struct ast_websocket_client_options {
+	/*!
+	 * The URI to connect to
+	 *
+	 * Expected uri form:
+	 *     \verbatim ws[s]://<address>[:port][/<path>] \endverbatim
+	 *     The address (can be a host name) and port are parsed out and used to connect
+	 *     to the remote server.  If multiple IPs are returned during address
+	 *     resolution then the first one is chosen.
+	 */
+	const char *uri;
+	/*!
+	 * A comma separated string of supported protocols
+	 */
+	const char *protocols;
+	/*!
+	 * Optional connection timeout
+	 *
+	 * How long (in milliseconds) to attempt to connect (-1 equals infinite)
+	 */
+	int timeout;
+	/*!
+	 * Secure websocket credentials
+	 */
+	struct ast_tls_config *tls_cfg;
+};
+
+/*!
+ * \brief Create, and connect, a websocket client using given options.
+ *
+ * If the client websocket successfully connects, then the accepted protocol can be
+ * checked via a call to ast_websocket_client_accept_protocol.
+ *
+ * \note While connecting this *will* block until a response is received
+ *       from the remote host, or the connection timeout is reached
+ *
+ * \param options Websocket client options
+ * \param result result code set on client failure
+ *
+ * \return a client websocket.
+ * \retval NULL if object could not be created or connected
+ */
+AST_OPTIONAL_API(struct ast_websocket *, ast_websocket_client_create_with_options,
+	(struct ast_websocket_client_options *options,
+	enum ast_websocket_result *result), { return NULL;});
+
+/*!
  * \brief Retrieve the server accepted sub-protocol on the client.
  *
  * \param ws the websocket client
diff --git a/res/res_http_websocket.c b/res/res_http_websocket.c
index 624f20c..05efee9 100644
--- a/res/res_http_websocket.c
+++ b/res/res_http_websocket.c
@@ -1223,8 +1223,7 @@
 }
 
 static struct ast_websocket * websocket_client_create(
-	const char *uri, const char *protocols,	struct ast_tls_config *tls_cfg,
-	enum ast_websocket_result *result)
+	struct ast_websocket_client_options *options, enum ast_websocket_result *result)
 {
 	struct ast_websocket *ws = ao2_alloc(sizeof(*ws), session_destroy_fn);
 
@@ -1248,18 +1247,18 @@
 	}
 
 	if (websocket_client_parse_uri(
-		    uri, &ws->client->host, &ws->client->resource_name)) {
+		    options->uri, &ws->client->host, &ws->client->resource_name)) {
 		ao2_ref(ws, -1);
 		*result = WS_URI_PARSE_ERROR;
 		return NULL;
 	}
 
 	if (!(ws->client->args = websocket_client_args_create(
-		      ws->client->host, tls_cfg, result))) {
+		      ws->client->host, options->tls_cfg, result))) {
 		ao2_ref(ws, -1);
 		return NULL;
 	}
-	ws->client->protocols = ast_strdup(protocols);
+	ws->client->protocols = ast_strdup(options->protocols);
 
 	ws->client->version = 13;
 	ws->opcode = -1;
@@ -1395,13 +1394,13 @@
 	return websocket_client_handshake_get_response(client);
 }
 
-static enum ast_websocket_result websocket_client_connect(struct ast_websocket *ws)
+static enum ast_websocket_result websocket_client_connect(struct ast_websocket *ws, int timeout)
 {
 	enum ast_websocket_result res;
 	/* create and connect the client - note client_start
 	   releases the session instance on failure */
-	if (!(ws->client->ser = ast_tcptls_client_start(
-		      ast_tcptls_client_create(ws->client->args)))) {
+	if (!(ws->client->ser = ast_tcptls_client_start_timeout(
+		      ast_tcptls_client_create(ws->client->args), timeout))) {
 		return WS_CLIENT_START_ERROR;
 	}
 
@@ -1422,14 +1421,26 @@
 	(const char *uri, const char *protocols, struct ast_tls_config *tls_cfg,
 	 enum ast_websocket_result *result)
 {
-	struct ast_websocket *ws = websocket_client_create(
-		uri, protocols, tls_cfg, result);
+	struct ast_websocket_client_options options = {
+		.uri = uri,
+		.protocols = protocols,
+		.timeout = -1,
+		.tls_cfg = tls_cfg,
+	};
+
+	return ast_websocket_client_create_with_options(&options, result);
+}
+
+struct ast_websocket *AST_OPTIONAL_API_NAME(ast_websocket_client_create_with_options)
+	(struct ast_websocket_client_options *options, enum ast_websocket_result *result)
+{
+	struct ast_websocket *ws = websocket_client_create(options, result);
 
 	if (!ws) {
 		return NULL;
 	}
 
-	if ((*result = websocket_client_connect(ws)) != WS_OK) {
+	if ((*result = websocket_client_connect(ws, options->timeout)) != WS_OK) {
 		ao2_ref(ws, -1);
 		return NULL;
 	}

-- 
To view, visit https://gerrit.asterisk.org/c/asterisk/+/17925
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Gerrit-Project: asterisk
Gerrit-Branch: 16
Gerrit-Change-Id: I5812f6f28d3d13adbc246517f87af177fa20ee9d
Gerrit-Change-Number: 17925
Gerrit-PatchSet: 1
Gerrit-Owner: Kevin Harwell <kharwell at digium.com>
Gerrit-MessageType: newchange
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