Added a ConnectionException, misc fixes

src/CommandBusClient.php

@@ -32,6 +32,8 @@ class CommandBusClient implements CommandBusInterface
 
     private bool $autoReconnect = true;
 
+    private bool $isReconnecting = false;
+
     public function __construct(?CommandRegistry $commandRegistry = null, ?ConnectorInterface $connector = null)
     {
         $this->commandRegistry = $commandRegistry;
@@ -64,6 +66,7 @@ class CommandBusClient implements CommandBusInterface
             $this->connection = null;
         }
 
+        $this->isReconnecting = true;
         $this->connector->connect($this->address)->then(
             function (DuplexStreamInterface $connection) {
                 $this->connection = $connection;
@@ -73,12 +76,14 @@ class CommandBusClient implements CommandBusInterface
                     if ($this->autoReconnect) {
                         Loop::addTimer(1, $this->reconnect(...));
                     }
+                    $this->isReconnecting = false;
                 });
                 $connection->on('close', function () {
                     $this->emit(self::EVENT_DISCONNECTED);
                     if ($this->autoReconnect) {
                         Loop::addTimer(1, $this->reconnect(...));
                     }
+                    $this->isReconnecting = false;
                 });
                 $connection->on('data', function ($data) use ($connection) {
                     try {
@@ -142,10 +147,11 @@ class CommandBusClient implements CommandBusInterface
      */
     public function execute(string $command, array $context): PromiseInterface
     {
-        if (!$this->connection) {
+        if (!$this->connection || !$this->connection->isWritable()) {
+            $this->reconnect();
             return new Promise(function (callable $resolve, callable $canceller) {
-                $canceller(new \RuntimeException("Not connected to command bus."));
-            });
+                $canceller(new ConnectionException("Not connected to command bus."));
+            });    
         }
 
         $deferred = new Deferred();

src/CommandBusException.php

@@ -2,7 +2,7 @@
 
 namespace NoccyLabs\React\CommandBus;
 
-interface CommandBusException
+class CommandBusException extends \RuntimeException
 {
 }
 

src/ConnectionException.php

@@ -0,0 +1,8 @@
+<?php
+
+namespace NoccyLabs\React\CommandBus;
+
+class ConnectionException extends CommandBusException
+{
+}
+

src/MessageException.php

@@ -1,9 +1,8 @@
 <?php
 
 namespace NoccyLabs\React\CommandBus;
-use RuntimeException;
 
-class MessageException extends RuntimeException implements CommandBusException
+class MessageException extends CommandBusException
 {
 }