// Once response received, send next queued event.
message_xmlhttprequest.onreadystatechange = function() {
- if (message_xmlhttprequest.readyState == 4)
- sendPendingMessages();
+ if (message_xmlhttprequest.readyState == 4) {
+
+ // If an error occurs during send, handle it
+ if (message_xmlhttprequest.status != 200)
+ handleHTTPTunnelError(message_xmlhttprequest);
+
+ // Otherwise, continue the send loop
+ else
+ sendPendingMessages();
+
+ }
}
message_xmlhttprequest.send(outputMessageBuffer);
}
+ function getHTTPTunnelErrorMessage(xmlhttprequest) {
+
+ var status = xmlhttprequest.status;
+
+ // Special cases
+ if (status == 0) return "Disconnected";
+ if (status == 200) return "Success";
+ if (status == 403) return "Unauthorized";
+ if (status == 404) return "Connection closed"; /* While it may be more
+ * accurate to say the
+ * connection does not
+ * exist, it is confusing
+ * to the user.
+ *
+ * In general, this error
+ * will only happen when
+ * the tunnel does not
+ * exist, which happens
+ * after the connection
+ * is closed and the
+ * tunnel is detached.
+ */
+ // Internal server errors
+ if (status >= 500 && status <= 599) return "Server error";
+
+ // Otherwise, unknown
+ return "Unknown error";
+
+ }
+
+ function handleHTTPTunnelError(xmlhttprequest) {
+
+ // Get error message
+ var message = getHTTPTunnelErrorMessage(xmlhttprequest);
+
+ // Call error handler
+ if (tunnel.onerror) tunnel.onerror(message);
+
+ // Finish
+ tunnel.disconnect();
+
+ }
+
function handleResponse(xmlhttprequest) {
// Halt on error during request
else if (xmlhttprequest.status != 200) {
-
- // Get error message (if any)
- var message = xmlhttprequest.getResponseHeader("X-Guacamole-Error-Message");
- if (!message)
- message = "Internal server error";
-
- // Call error handler
- if (tunnel.onerror) tunnel.onerror(message);
-
- // Finish
- tunnel.disconnect();
+ handleHTTPTunnelError(xmlhttprequest);
return;
}
// If failure, throw error
if (connect_xmlhttprequest.status != 200) {
-
- var message = connect_xmlhttprequest.getResponseHeader("X-Guacamole-Error-Message");
- if (!message)
- message = "Internal error";
-
+ var message = getHTTPTunnelErrorMessage(connect_xmlhttprequest);
throw new Error(message);
-
}
// Get UUID from response
"https:": "wss:"
};
+ var status_code = {
+ 1000: "Connection closed normally.",
+ 1001: "Connection shut down.",
+ 1002: "Protocol error.",
+ 1003: "Invalid data.",
+ 1004: "[UNKNOWN, RESERVED]",
+ 1005: "No status code present.",
+ 1006: "Connection closed abnormally.",
+ 1007: "Inconsistent data type.",
+ 1008: "Policy violation.",
+ 1009: "Message too large.",
+ 1010: "Extension negotiation failed."
+ };
+
var STATE_IDLE = 0;
var STATE_CONNECTED = 1;
var STATE_DISCONNECTED = 2;
currentState = STATE_CONNECTED;
};
+ socket.onclose = function(event) {
+
+ // If connection closed abnormally, signal error.
+ if (event.code != 1000 && tunnel.onerror)
+ tunnel.onerror(status_code[event.code]);
+
+ };
+
+ socket.onerror = function(event) {
+
+ // Call error handler
+ if (tunnel.onerror) tunnel.onerror(event.data);
+
+ };
+
socket.onmessage = function(event) {
var message = event.data;
Guacamole.WebSocketTunnel.prototype = new Guacamole.Tunnel();
+
+/**
+ * Guacamole Tunnel which cycles between all specified tunnels until
+ * no tunnels are left. Another tunnel is used if an error occurs but
+ * no instructions have been received. If an instruction has been
+ * received, or no tunnels remain, the error is passed directly out
+ * through the onerror handler (if defined).
+ *
+ * @constructor
+ * @augments Guacamole.Tunnel
+ * @param {...} tunnel_chain The tunnels to use, in order of priority.
+ */
+Guacamole.ChainedTunnel = function(tunnel_chain) {
+
+ /**
+ * Reference to this chained tunnel.
+ */
+ var chained_tunnel = this;
+
+ /**
+ * The currently wrapped tunnel, if any.
+ */
+ var current_tunnel = null;
+
+ /**
+ * Data passed in via connect(), to be used for
+ * wrapped calls to other tunnels' connect() functions.
+ */
+ var connect_data;
+
+ /**
+ * Array of all tunnels passed to this ChainedTunnel through the
+ * constructor arguments.
+ */
+ var tunnels = [];
+
+ // Load all tunnels into array
+ for (var i=0; i<arguments.length; i++)
+ tunnels.push(arguments[i]);
+
+ /**
+ * Sets the current tunnel
+ */
+ function attach(tunnel) {
+
+ // Clear handlers of current tunnel, if any
+ if (current_tunnel) {
+ current_tunnel.onerror = null;
+ current_tunnel.oninstruction = null;
+ }
+
+ // Set own functions to tunnel's functions
+ chained_tunnel.disconnect = tunnel.disconnect;
+ chained_tunnel.sendMessage = tunnel.sendMessage;
+
+ // Record current tunnel
+ current_tunnel = tunnel;
+
+ // Wrap own oninstruction within current tunnel
+ current_tunnel.oninstruction = function(opcode, elements) {
+
+ // Invoke handler
+ chained_tunnel.oninstruction(opcode, elements);
+
+ // Use handler permanently from now on
+ current_tunnel.oninstruction = chained_tunnel.oninstruction;
+
+ // Pass through errors (without trying other tunnels)
+ current_tunnel.onerror = chained_tunnel.onerror;
+
+ }
+
+ // Attach next tunnel on error
+ current_tunnel.onerror = function(message) {
+
+ // Get next tunnel
+ var next_tunnel = tunnels.shift();
+
+ // If there IS a next tunnel, try using it.
+ if (next_tunnel)
+ attach(next_tunnel);
+
+ // Otherwise, call error handler
+ else if (chained_tunnel.onerror)
+ chained_tunnel.onerror(message);
+
+ };
+
+ try {
+
+ // Attempt connection
+ current_tunnel.connect(connect_data);
+
+ }
+ catch (e) {
+
+ // Call error handler of current tunnel on error
+ current_tunnel.onerror(e.message);
+
+ }
+
+
+ }
+
+ this.connect = function(data) {
+
+ // Remember connect data
+ connect_data = data;
+
+ // Get first tunnel
+ var next_tunnel = tunnels.shift();
+
+ // Attach first tunnel
+ if (next_tunnel)
+ attach(next_tunnel);
+
+ // If there IS no first tunnel, error
+ else if (chained_tunnel.onerror)
+ chained_tunnel.onerror("No tunnels to try.");
+
+ };
+
+};
+
+Guacamole.ChainedTunnel.prototype = new Guacamole.Tunnel();