[Groonga-commit] droonga/express-droonga at 5aab584 [master] Output logs with formatted prefix

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YUKI Hiroshi null+****@clear*****
Wed Apr 29 14:44:31 JST 2015


YUKI Hiroshi	2015-04-29 14:44:31 +0900 (Wed, 29 Apr 2015)

  New Revision: 5aab5849a8ba6810a4cf11731fe95f24d4adb1d7
  https://github.com/droonga/express-droonga/commit/5aab5849a8ba6810a4cf11731fe95f24d4adb1d7

  Message:
    Output logs with formatted prefix

  Modified files:
    index.js
    lib/adapter/http.js
    lib/adapter/wrapper.js
    lib/droonga-protocol/connection-pool.js
    lib/droonga-protocol/connection.js
    lib/droonga-protocol/receiver.js
    lib/middleware/cache/index.js
    lib/serf/agent.js
    lib/serf/downloader.js

  Modified: index.js (+3 -1)
===================================================================
--- index.js    2015-04-29 12:43:21 +0900 (2ae7c59)
+++ index.js    2015-04-29 14:44:31 +0900 (93c8626)
@@ -5,6 +5,8 @@ var socketIoAdapter = require('./lib/adapter/socket.io');
 var dashboardUI = require('./lib/ui/dashboard');
 var ConsoleLogger = require('./lib/console-logger').ConsoleLogger;
 
+var LOG_PREFIX = '[global] ';
+
 function droonga(application, params) {
   params = params || {};
 
@@ -21,7 +23,7 @@ function droonga(application, params) {
   if (params.server) {
     socketIoAdapter.register(application, params.server, params);
     params.server.on('error', function(error) {
-      params.logger.error(error);
+      params.logger.error(LOG_PREFIX + 'Unhandled Error', error);
       if (typeof connectionPool.shutdown == 'function')
         connectionPool.shutdown();
     });

  Modified: lib/adapter/http.js (+7 -5)
===================================================================
--- lib/adapter/http.js    2015-04-29 12:43:21 +0900 (f90f23c)
+++ lib/adapter/http.js    2015-04-29 14:44:31 +0900 (d0e5d37)
@@ -9,6 +9,8 @@ var MAX_RETRY_COUNT = 60;
 var ERROR_INTERNAL = 500;
 var ERROR_GATEWAY_TIMEOUT = 504;
 
+var LOG_PREFIX = '[http-adapter] ';
+
 function createRequestResponseHandler(params) {
   params = params || {};
   var connectionPool = params.connectionPool;
@@ -17,7 +19,7 @@ function createRequestResponseHandler(params) {
   var logger = definition.logger;
 
   return (function(request, response) {
-    logger.trace('adapter.http.createRequestResponseHandler.handle');
+    logger.trace(LOG_PREFIX + 'createRequestResponseHandler.handle');
 
     var options = {};
     if (typeof definition.dataset != 'undefined')
@@ -27,13 +29,13 @@ function createRequestResponseHandler(params) {
       options.timeout = timeout;
 
     var callback = function(error, message) {
-        logger.trace('adapter.http.createRequestResponseHandler.handle.response');
+        logger.trace(LOG_PREFIX + 'createRequestResponseHandler.handle.response');
         if (error) {
-          logger.trace('adapter.http.createRequestResponseHandler.handle.response.error:', error);
+          logger.trace(LOG_PREFIX + 'createRequestResponseHandler.handle.response.error:', error);
           var body = message && message.body || null;
           response.status(error).jsonp(body);
         } else {
-          logger.trace('adapter.http.createRequestResponseHandler.handle.response.success');
+          logger.trace(LOG_PREFIX + 'createRequestResponseHandler.handle.response.success');
           var body = message.body;
           if (definition.onResponse) {
             definition.onResponse(body, response);
@@ -96,7 +98,7 @@ function createGenericHandler(params) {
   var logger = definition.logger;
 
   return (function(request, response) {
-    logger.trace('adapter.http.createGenericHandler.handle');
+    logger.trace(LOG_PREFIX + 'createGenericHandler.handle');
 
     var options = {};
     if (typeof definition.dataset != 'undefined')

  Modified: lib/adapter/wrapper.js (+3 -1)
===================================================================
--- lib/adapter/wrapper.js    2015-04-29 12:43:21 +0900 (10e07bf)
+++ lib/adapter/wrapper.js    2015-04-29 14:44:31 +0900 (14862d9)
@@ -1,3 +1,5 @@
+var LOG_PREFIX = '[connection-wrapper] ';
+
 function DroongaProtocolConnectionWrapper(connection, callback, options) { // or (connection, options)
   this._connection = connection;
   if (typeof callback == 'function') {
@@ -25,7 +27,7 @@ DroongaProtocolConnectionWrapper.prototype = {
   },
   emit: function(event, data, callback, options) {
     if (this._connection.closed) {
-      this._logger.warn('connection is already closed.');
+      this._logger.warn(LOG_PREFIX + 'connection is already closed.');
       return;
     }
 

  Modified: lib/droonga-protocol/connection-pool.js (+29 -26)
===================================================================
--- lib/droonga-protocol/connection-pool.js    2015-04-29 12:43:21 +0900 (31f1bdc)
+++ lib/droonga-protocol/connection-pool.js    2015-04-29 14:44:31 +0900 (89fa5a4)
@@ -17,6 +17,8 @@ var Connection = require('./connection').Connection;
 var ConsoleLogger = require('../console-logger').ConsoleLogger;
 var SerfAgent = require('../serf/agent');
 
+var LOG_PREFIX = '[connection-pool] ';
+
 function ConnectionPool(params) {
   this._params = params || {};
 
@@ -126,16 +128,16 @@ ConnectionPool.prototype = {
   },
 
   getEnginesFromCluster: function(retryCount) {
-    this._logger.info('Getting engine names from cluster.');
+    this._logger.info(LOG_PREFIX + 'Getting engine names from cluster.');
     if (this._watching)
       return this.getEnginesFromClusterMember(this._serf.rpcAddress);
 
-    this._logger.info('Not watching: getting engine names from predetected member.');
+    this._logger.info(LOG_PREFIX + 'Not watching: getting engine names from predetected member.');
     retryCount = retryCount || 0;
     var hostName = this._hostNames[retryCount];
     if (!hostName) {
       var error = new Error('all cluster members are unaccessible.');
-      this._logger.error(error);
+      this._logger.error(LOG_PREFIX, error);
       return Q.Promise.reject(error);
     }
 
@@ -144,13 +146,14 @@ ConnectionPool.prototype = {
                    return engines;
                  })
                  .catch((function(error) {
-                   this._logger.error('Failed to get the list of droonga-engine hosts from the cluster member ' + hostName + '. Retrying...');
-                   this._logger.error(error);
+                   this._logger.error(LOG_PREFIX + 'Failed to get the list of droonga-engine hosts ' +
+                                        'from the cluster member ' + hostName + '. Retrying...',
+                                      error);
                    return this.getEnginesFromCluster(retryCount + 1);
                  }).bind(this));
   },
   getEnginesFromClusterMember: function(rpcAddress) {
-    this._logger.info('Getting engine names from a cluster member ' + rpcAddress + '.');
+    this._logger.info(LOG_PREFIX + 'Getting engine names from a cluster member ' + rpcAddress + '.');
     return Q.Promise((function(resolve, reject, notify) {
       if (!rpcAddress)
         reject(new Error('no RPC address is given'));
@@ -168,13 +171,13 @@ ConnectionPool.prototype = {
       ].join(' ');
       exec(commandLine, (function(error, stdin, stdout) {
         if (error) {
-          this._logger.error('express-droonga-report-live-engine-hosts:');
-          this._logger.error(stdin.trim());
+          this._logger.error(LOG_PREFIX + 'express-droonga-report-live-engine-hosts:',
+                             stdin.trim());
           return reject(error);
         }
         var result = JSON.parse(stdin.trim());
-        this._logger.trace('express-droonga-report-live-engine-hosts:');
-        this._logger.trace(result);
+        this._logger.trace(LOG_PREFIX + 'express-droonga-report-live-engine-hosts:',
+                           result);
         resolve(result.liveEngineNodes);
       }).bind(this));
     }).bind(this));
@@ -194,8 +197,8 @@ ConnectionPool.prototype = {
       ].join(' ');
       exec(commandLine, (function(error, stdin, stdout) {
         if (error) {
-          this._logger.error('express-droonga-join-to-cluster:');
-          this._logger.error(stdin.trim());
+          this._logger.error(LOG_PREFIX + 'express-droonga-join-to-cluster:',
+                             stdin.trim());
           return reject(error);
         }
         resolve();
@@ -207,7 +210,7 @@ ConnectionPool.prototype = {
     if (this.updating)
       return Q.Promise.resolve();
 
-    this._logger.info('Starting to update host names.');
+    this._logger.info(LOG_PREFIX + 'Starting to update host names.');
     this.updating = true;
     return this.getEnginesFromCluster()
                  .then((function(engines) {
@@ -219,15 +222,15 @@ ConnectionPool.prototype = {
                    // Otherwise, old droonga-engine processes become zombie.
                    this.closeAll();
                    this.hostNames = hostNames;
-                   this._logger.info('List of droonga-engine hosts is successfully initialized from the cluster.');
-                   this._logger.info('cluster id: '+this.clusterId);
-                   this._logger.info(hostNames);
+                   this._logger.info(LOG_PREFIX + 'List of droonga-engine hosts is successfully initialized from the cluster.');
+                   this._logger.info(LOG_PREFIX + 'cluster id: '+this.clusterId);
+                   this._logger.info(LOG_PREFIX + JSON.stringify(hostNames));
                    this.updating = false;
                    return hostNames;
                  }).bind(this))
                  .catch(function(error) {
-                   this._logger.error('Failed to initialize the list of droonga-engine hosts from the cluster.');
-                   this._logger.error(error);
+                   this._logger.error(LOG_PREFIX + 'Failed to initialize the list of droonga-engine hosts from the cluster.',
+                                      error);
                    this.updating = false;
                  });
   },
@@ -244,10 +247,10 @@ ConnectionPool.prototype = {
       });
       this._serf.start()
         .then((function() {
-          this._logger.info('Start to watch changes in the cluster.');
+          this._logger.info(LOG_PREFIX + 'Start to watch changes in the cluster.');
           this._watching = true;
           this._serf.on('member-change', (function() {
-            this._logger.info('Serf cluster member is changed.');
+            this._logger.info(LOG_PREFIX + 'Serf cluster member is changed.');
             if (this._updateHostNamesTimer)
               return;
             this._updateHostNamesTimer = setTimeout((function() {
@@ -263,8 +266,8 @@ ConnectionPool.prototype = {
           resolve();
         }).bind(this))
         .catch(function(error) {
-          this._logger.error('Failed to start watching of changes in the cluster.');
-          this._logger.error(error);
+          this._logger.error(LOG_PREFIX + 'Failed to start watching of changes in the cluster.',
+                             error);
           reject(error);
         });
     }).bind(this));
@@ -295,13 +298,13 @@ ConnectionPool.prototype = {
   },
 
   shutdown: function() {
-    this._logger.info('closing all connections...');
+    this._logger.info(LOG_PREFIX + 'closing all connections...');
     this.closeAll();
-    this._logger.info('done.');
+    this._logger.info(LOG_PREFIX + 'done.');
 
-    this._logger.info('stopping serf agent...');
+    this._logger.info(LOG_PREFIX + 'stopping serf agent...');
     this.stopSyncHostNamesFromCluster();
-    this._logger.info('done.');
+    this._logger.info(LOG_PREFIX + 'done.');
   }
 };
 

  Modified: lib/droonga-protocol/connection.js (+15 -13)
===================================================================
--- lib/droonga-protocol/connection.js    2015-04-29 12:43:21 +0900 (f001fa8)
+++ lib/droonga-protocol/connection.js    2015-04-29 14:44:31 +0900 (d43c161)
@@ -17,6 +17,8 @@ var FluentReceiver = require('./receiver').FluentReceiver;
 var ConsoleLogger = require('../console-logger').ConsoleLogger;
 var NodeRole      = require('../node-role');
 
+var LOG_PREFIX = '[connection] ';
+
 var DEFAULT_FLUENT_TAG =
       Connection.DEFAULT_FLUENT_TAG =
         'droonga';
@@ -89,7 +91,7 @@ Connection.prototype._initSender = function(wait) {
       '[' + error.name + '] ' + error.message;
     var ids = Object.keys(this._sendingMessages);
     if (ids.length == 0) {
-      this._logger.error(errorMessage, error);
+      this._logger.error(LOG_PREFIX + errorMessage, error);
     } else {
       ids.forEach(function(id) {
         var sendingMessage = this._sendingMessages[id];
@@ -131,7 +133,7 @@ Connection.prototype._initReceiver = function() {
   }).bind(this));
 
   var tag = this.tag + '.message';
-  this._logger.trace('Connection._initReceiver %d (%s): %d %d:',
+  this._logger.trace(LOG_PREFIX + 'Connection._initReceiver %d (%s): %d %d:',
                      this._id, this.hostAndPort,
                      receiver._id, this.receivePort, tag);
   this._receiver = receiver;
@@ -147,14 +149,14 @@ Connection.prototype._handleMessage = function(envelope) {
   var inReplyTo = envelope.inReplyTo;
   if (inReplyTo) {
     delete this._sendingMessages[inReplyTo];
-    this._logger.trace('Connection._handleMessage.reply %d (%s):',
+    this._logger.trace(LOG_PREFIX + 'Connection._handleMessage.reply %d (%s):',
                        this._id, this.hostAndPort, envelope);
     var errorCode = envelope.statusCode;
     if (!errorCode || isSuccess(errorCode))
       errorCode = null;
     this.emit('reply:' + inReplyTo, errorCode, envelope);
   } else {
-    this._logger.trace('Connection._handleMessage.message %d (%s):',
+    this._logger.trace(LOG_PREFIX + 'Connection._handleMessage.message %d (%s):',
                        this._id, this.hostAndPort, envelope);
     this.emit(envelope.type, envelope);
   }
@@ -218,7 +220,7 @@ Connection.prototype.emitMessage = function(type, body, callback, options) {
   }
 
   if (!this.receivePort) {
-    this._logger.trace('Connection.emitMessage %d (%s): ' +
+    this._logger.trace(LOG_PREFIX + 'Connection.emitMessage %d (%s): ' +
                          'Receiver is not initialized yet. ' +
                          'Given message will be sent later.',
                        this._id, this.hostAndPort);
@@ -227,7 +229,7 @@ Connection.prototype.emitMessage = function(type, body, callback, options) {
   }
 
   var id = createId();
-  this._logger.trace('Connection.emitMessage %d (%s):',
+  this._logger.trace(LOG_PREFIX + 'Connection.emitMessage %d (%s):',
                      this._id, this.hostAndPort);
   var from = this.getRouteToSelf(options);
   var envelope = {
@@ -248,7 +250,7 @@ Connection.prototype.emitMessage = function(type, body, callback, options) {
   if (typeof envelope.timeout == 'number')
     envelope.timeout = toFloat(envelope.timeout);
 
-  this._logger.trace('emitMessage: trying to send message: ',
+  this._logger.trace(LOG_PREFIX + 'emitMessage: trying to send message: ',
                      envelope);
 
   var sendingMessages = { type: type };
@@ -259,7 +261,7 @@ Connection.prototype.emitMessage = function(type, body, callback, options) {
     var event = 'reply:' + id;
     var timeoutId;
     this.once(event, (function(errorCode, response) {
-      this._logger.trace('Connection.emitMessage.reply %d (%s):',
+      this._logger.trace(LOG_PREFIX + 'Connection.emitMessage.reply %d (%s):',
                          this._id, this.hostAndPort, errorCode);
       if (timeoutId)
         clearTimeout(timeoutId);
@@ -272,14 +274,14 @@ Connection.prototype.emitMessage = function(type, body, callback, options) {
         callback = null;
       }
       catch(error) {
-        this._logger.error(error);
+        this._logger.error(LOG_PREFIX, error);
       }
     }).bind(this));
 
     if (envelope.timeout > -1) {
       var timeoutMilliseconds = envelope.timeout * ONE_SECOND_IN_MILLISECONDS;
       timeoutId = setTimeout((function() {
-        this._logger.trace('Connection timed out (message id: '+id+')');
+        this._logger.trace(LOG_PREFIX + 'Connection timed out (message id: '+id+')');
         this.removeAllListeners(event);
         if (sendingMessages)
           sendingMessages.callback = null;
@@ -290,7 +292,7 @@ Connection.prototype.emitMessage = function(type, body, callback, options) {
           callback = null;
         }
         catch(error) {
-          this._logger.error(error);
+          this._logger.error(LOG_PREFIX, error);
         }
       }).bind(this), timeoutMilliseconds);
     }
@@ -309,7 +311,7 @@ Connection.prototype.thenableEmitMessage = function(type, body, options) {
 };
 
 Connection.prototype._sendPendingMessages = function() {
-  this._logger.trace('Connection._sendPendingMessages %d (%s): ' +
+  this._logger.trace(LOG_PREFIX + 'Connection._sendPendingMessages %d (%s): ' +
                        'Send %d pending message(s).',
                      this._id, this.hostAndPort,
                      this._pendingMessages.length);
@@ -333,7 +335,7 @@ Connection.prototype.close = function() {
         message.callback = callback = null;
       }
       catch(error) {
-        this._logger.error(error)
+        this._logger.error(LOG_PREFIX, error)
       }
     }
   }, this);

  Modified: lib/droonga-protocol/receiver.js (+9 -6)
===================================================================
--- lib/droonga-protocol/receiver.js    2015-04-29 12:43:21 +0900 (cd02006)
+++ lib/droonga-protocol/receiver.js    2015-04-29 14:44:31 +0900 (fee9760)
@@ -5,6 +5,9 @@ var msgpack = require('msgpack');
 var Q = require('q');
 var ConsoleLogger = require('../console-logger').ConsoleLogger;
 
+var MSGPACK_PREFIX = '[msgpack-receiver] ';
+var FLUENT_PREFIX  = '[fluent-receiver] ';
+
 function MsgPackReceiver(port, options) {
   EventEmitter.call(this);
   this.port = port || undefined;
@@ -38,9 +41,9 @@ MsgPackReceiver.prototype._onConnect = function(socket) {
 };
 
 MsgPackReceiver.prototype._onMessageReceive = function(data) {
-  this._logger.trace('MsgPackReceiver._onMessageReceive %d: start', this._id);
+  this._logger.trace(MSGPACK_PREFIX + '_onMessageReceive %d: start', this._id);
   this.emit('receive', data);
-  this._logger.trace('MsgPackReceiver._onMessageReceive %d: done', this._id);
+  this._logger.trace(MSGPACK_PREFIX + '_onMessageReceive %d: done', this._id);
 };
 
 MsgPackReceiver.prototype.listen = function(callback) {
@@ -134,21 +137,21 @@ function FluentReceiver(port, options) {
 util.inherits(FluentReceiver, MsgPackReceiver);
 
 FluentReceiver.prototype._onMessageReceive = function(packet) {
-  this._logger.trace('FluentReceiver._onMessageReceive %d: start', this._id);
+  this._logger.trace(FLUENT_PREFIX + '_onMessageReceive %d: start', this._id);
   MsgPackReceiver.prototype._onMessageReceive.call(this, packet);
   if (packet.length == 3) { // Message type
     var tag = packet[0];
     var response = packet[2];
-    this._logger.trace('FluentReceiver._onMessageReceive.message %d', this._id, tag);
+    this._logger.trace(FLUENT_PREFIX + '_onMessageReceive.message %d', this._id, tag);
     this.emit(tag, response);
   }
   else { // Forward type
-    this._logger.trace('FluentReceiver._onMessageReceive.forward %d', this._id, packet);
+    this._logger.trace(FLUENT_PREFIX + '_onMessageReceive.forward %d', this._id, packet);
     packet[1].forEach(function(entry) {
       this.emit(packet[0], entry[1]);
     }, this);
   }
-  this._logger.trace('FluentReceiver._onMessageReceive %d: done', this._id);
+  this._logger.trace(FLUENT_PREFIX + '_onMessageReceive %d: done', this._id);
 };
 
 exports.FluentReceiver = FluentReceiver;

  Modified: lib/middleware/cache/index.js (+3 -1)
===================================================================
--- lib/middleware/cache/index.js    2015-04-29 12:43:21 +0900 (afec694)
+++ lib/middleware/cache/index.js    2015-04-29 14:44:31 +0900 (0a8abc4)
@@ -3,6 +3,8 @@ var Rule = require('./rule');
 
 var defaultTTLInMilliSeconds = 60 * 1000;
 
+var LOG_PREFIX = '[middleware-cache] ';
+
 function getNormalizedTTLInMilliSeconds(options) {
   var ttlInSeconds = options.ttlInSeconds || 0;
   return options.ttl ||
@@ -78,7 +80,7 @@ module.exports = function cacheMiddleware(cache, options) {
     var cacheKey = generateKey(request);
     cache.get(cacheKey, function(error, cachedResponse) {
       if (error) {
-        logger.error(error);
+        logger.error(LOG_PREFIX, error);
         return;
       }
 

  Modified: lib/serf/agent.js (+14 -12)
===================================================================
--- lib/serf/agent.js    2015-04-29 12:43:21 +0900 (d8400b6)
+++ lib/serf/agent.js    2015-04-29 14:44:31 +0900 (0ba0aa0)
@@ -34,6 +34,8 @@ var DEFAULT_BIND_PORT = 7946;
 var BIND_PORT         = 8946;
 var RPC_PORT          = 8373;
 
+var LOG_PREFIX = '[serf-agent] ';
+
 function Agent(options) {
   options = options || {};
 
@@ -59,14 +61,14 @@ function Agent(options) {
 util.inherits(Agent, EventEmitter);
 
 Agent.prototype.start = function() {
-  this._logger.trace('Starting Serf agent (' + this._serf + ')');
+  this._logger.trace(LOG_PREFIX + 'Starting Serf agent (' + this._serf + ')');
   return Q.Promise((function(resolve, reject, notify) {
     if (this._agentProcess)
       return resolve();
 
     if (this._serf.charAt(0) == '/' &&
         !fs.existsSync(this._serf)) {
-      this._logger.info('Serf command is not found. Install Serf automatically.');
+      this._logger.info(LOG_PREFIX + 'Serf command is not found. Install Serf automatically.');
       new Downloader({ logger: this._logger })
         .saveTo(path.dirname(this._serf))
         .then((function() {
@@ -105,31 +107,31 @@ Agent.prototype.tryStart = function() {
     agentArgs.push(address);
   });
   try {
-    this._logger.info('Starting Serf agent: ' + this._serf + ' ' + agentArgs.join(' '));
+    this._logger.info(LOG_PREFIX + 'Starting Serf agent: ' + this._serf + ' ' + agentArgs.join(' '));
     this._agentProcess = spawn(this._serf, agentArgs);
     this._agentProcess.on('close', (function(exitStatusCode) {
       if (exitStatusCode != 0)
-        this._logger.error(new Error('Serf agent is closed with error: ' + exitStatusCode));
+        this._logger.error(LOG_PREFIX, new Error('Serf agent is closed with error: ' + exitStatusCode));
       this._agentProcess = null;
     }).bind(this));
     this._agentProcess.stdout.on('data', (function(data) {
       this._handleOutput(String(data));
     }).bind(this));
   } catch(error) {
-    this._logger.error('Failed to start Serf agent.');
-    this._logger.error(error);
+    this._logger.error(LOG_PREFIX + 'Failed to start Serf agent.',
+                       error);
     try {
       this._agentProcess.kill();
     } catch(error) {
-      this._logger.error('Failed to stop Serf agent.');
-      this._logger.error(error);
+      this._logger.error(LOG_PREFIX + 'Failed to stop Serf agent.',
+                         error);
     }
     this._agentProcess = null;
   }
 };
 
 Agent.prototype._handleOutput = function(output) {
-  this._logger.trace('Serf agent output: ' + output);
+  this._logger.trace(LOG_PREFIX + 'Serf agent output: ' + output);
   var matched = output.match(EVENT_LOG_PATTERN);
   if (!matched)
     return;
@@ -169,7 +171,7 @@ Agent.prototype._handleOutput = function(output) {
 };
 
 Agent.prototype.shutdown = function() {
-  this._logger.info('Shutting down Serf agent');
+  this._logger.info(LOG_PREFIX + 'Shutting down Serf agent');
   return Q.Promise((function(resolve, reject, notify) {
     this.removeAllListeners();
     if (!this._agentProcess)
@@ -181,8 +183,8 @@ Agent.prototype.shutdown = function() {
       this._agentProcess = null;
       resolve();
     } catch(error) {
-      this._logger.error('Failed to stop Serf agent.');
-      this._logger.error(error);
+      this._logger.error(LOG_PREFIX + 'Failed to stop Serf agent.',
+                         error);
       reject(error);
     }
   }).bind(this));

  Modified: lib/serf/downloader.js (+7 -5)
===================================================================
--- lib/serf/downloader.js    2015-04-29 12:43:21 +0900 (03ff3a1)
+++ lib/serf/downloader.js    2015-04-29 14:44:31 +0900 (65d5ec6)
@@ -19,6 +19,8 @@ var RETRY_INTERVAL  = 10 * 1000;
 var VERSION  = '0.6.3';
 var BASE_URL = 'https://dl.bintray.com/mitchellh/serf';
 
+var LOG_PREFIX = '[serf-downloader] ';
+
 function Downloader(options) {
   options = options || {};
   this._logger = options.logger || new ConsoleLogger();
@@ -29,7 +31,7 @@ Downloader.prototype = {
     return Q.Promise((function(resolve, reject, notify) {
       if (!fs.existsSync(dir)) {
         var error = new Error(dir + ' does not exist!');
-        this._logger.error(error);
+        this._logger.error(LOG_PREFIX, error);
         return reject(error);
       }
 
@@ -40,14 +42,14 @@ Downloader.prototype = {
           .then(resolve)
           .catch(reject);
       } catch(error) {
-        this._logger.error(error);
+        this._logger.error(LOG_PREFIX, error);
         reject(error);
       }
     }).bind(this));
   },
 
   _trySave: function(url, dir, retryCount) {
-    this._logger.debug('Serf Downloader: Trying to download ' + url +
+    this._logger.debug(LOG_PREFIX + 'Serf Downloader: Trying to download ' + url +
                          ' to ' + dir + ' (rest=' + retryCount + ')');
     return Q.Promise((function(resolve, reject, notify) {
       try {
@@ -59,9 +61,9 @@ Downloader.prototype = {
         download.run((function(error, files, stream) {
           if (error) {
             if (retryCount > 0) {
-              this._logger.error(error);
+              this._logger.error(LOG_PREFIX, error);
               setTimeout((function() {
-                this._logger.error('Serf Downloader: Retrying to download.');
+                this._logger.error(LOG_PREFIX + 'Serf Downloader: Retrying to download.');
                 this._trySave(url, dir, retryCount - 1)
                        .then(resolve)
                        .catch(reject);
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