Backport fix for #136 to 1.0

Author: pontusmelke

src/v1/internal/ch-node.js

@@ -276,6 +276,7 @@ class NodeChannel {
       });
 
       self._conn.on('error', self._handleConnectionError);
+      self._conn.on('end', self._handleConnectionTerminated);
 
       // Drain all pending messages
       let pending = self._pending;
@@ -293,6 +294,13 @@ class NodeChannel {
     }
   }
 
+  _handleConnectionTerminated() {
+    this._error = new Error('Connection was closed by server');
+    if( this.onerror ) {
+      this.onerror(this._error);
+    }
+  }
+
   /**
    * Write the passed in buffer to connection
    * @param {NodeBuffer} buffer - Buffer to write
@@ -318,6 +326,7 @@ class NodeChannel {
     this._open = false;
     if( this._conn ) {
       this._conn.end();
+      this._conn.removeListener('end', this._handleConnectionTerminated);
       this._conn.on('end', cb);
     } else {
       cb();

src/v1/internal/pool.js

@@ -40,11 +40,16 @@ class Pool {
   }
 
   acquire() {
-    if( this._pool.length > 0 ) {
-      return this._pool.pop();
-    } else {
-      return this._create( this._release );
+    let resource;
+    while (this._pool.length) {
+      resource = this._pool.pop();
+
+      if (this._validate(resource)) {
+        return resource;
+      }
     }
+
+    return this._create(this._release);
   }
 
   _release(resource) {