Connection errors should be thrown with the root cause

Author: bigmontz

bolt-connection/src/bolt/bolt-protocol-v1.js

@@ -84,6 +84,10 @@ export default class BoltProtocol {
     return BOLT_PROTOCOL_V1
   }
 
+  get currentFailure () {
+    return this._responseHandler.currentFailure
+  }
+
   /**
    * Get the packer.
    * @return {Packer} the protocol's packer.

bolt-connection/src/bolt/response-handler.js

@@ -146,6 +146,10 @@ export default class ResponseHandler {
     }
   }
 
+  get currentFailure () {
+    return this._currentFailure
+  }
+
   /*
    * Pop next pending observer form the list of observers and make it current observer.
    * @protected

bolt-connection/src/connection/connection-channel.js

@@ -270,7 +270,7 @@ export default class ChannelConnection extends Connection {
    */
   _handleFatalError (error) {
     this._isBroken = true
-    this._error = this.handleAndTransformError(error, this._address)
+    this._error = this.handleAndTransformError(this._protocol.currentFailure || error, this._address)
 
     if (this._log.isErrorEnabled()) {
       this._log.error(