Pass logger configuration to analysis backend and create a stream based on config

config/environments/development.js.example

@@ -210,6 +210,12 @@ var config = {
             endpoint: 'http://127.0.0.1:8080/api/v2/sql/job',
             // the template to use for adding the host header in the batch api requests
             hostHeaderTemplate: '{{=it.username}}.localhost.lan'
+        },
+        logger: {
+            // If filename is given logs comming from analysis client  will be written
+            // there, in append mode. Otherwise 'log_filename' is used. Otherwise stdout is used (default).
+            // Log file will be re-opened on receiving the HUP signal
+            filename: '/tmp/analysis.log'
         }
     }
     ,millstone: {

config/environments/production.js.example

@@ -204,6 +204,12 @@ var config = {
             endpoint: 'http://127.0.0.1:8080/api/v2/sql/job',
             // the template to use for adding the host header in the batch api requests
             hostHeaderTemplate: '{{=it.username}}.localhost.lan'
+        },
+        logger: {
+            // If filename is given logs comming from analysis client  will be written
+            // there, in append mode. Otherwise 'log_filename' is used. Otherwise stdout is used (default).
+            // Log file will be re-opened on receiving the HUP signal
+            filename: 'logs/analysis.log'
         }
     }
     ,millstone: {

config/environments/staging.js.example

@@ -204,6 +204,12 @@ var config = {
             endpoint: 'http://127.0.0.1:8080/api/v2/sql/job',
             // the template to use for adding the host header in the batch api requests
             hostHeaderTemplate: '{{=it.username}}.localhost.lan'
+        },
+        logger: {
+            // If filename is given logs comming from analysis client  will be written
+            // there, in append mode. Otherwise 'log_filename' is used. Otherwise stdout is used (default).
+            // Log file will be re-opened on receiving the HUP signal
+            filename: 'logs/analysis.log'
         }
     }
     ,millstone: {

config/environments/test.js.example

@@ -205,6 +205,12 @@ var config = {
             endpoint: 'http://127.0.0.1:8080/api/v2/sql/job',
             // the template to use for adding the host header in the batch api requests
             hostHeaderTemplate: '{{=it.username}}.localhost.lan'
+        },
+        logger: {
+            // If filename is given logs comming from analysis client  will be written
+            // there, in append mode. Otherwise 'log_filename' is used. Otherwise stdout is used (default).
+            // Log file will be re-opened on receiving the HUP signal
+            filename: 'logs/analysis.log'
         }
     }
     ,millstone: {

lib/cartodb/backends/analysis.js

@@ -1,19 +1,36 @@
 var camshaft = require('camshaft');
+var fs = require('fs');
 
 function AnalysisBackend (options) {
-    var batchConfig = options.batch || {};
+    options = options || {};
+    this.setBatchConfig(options.batch);
+    this.setLoggerConfig(options.logger);
+}
+
+module.exports = AnalysisBackend;
+
+AnalysisBackend.prototype.setBatchConfig = function (options) {
+    var batchConfig = options || {};
     batchConfig.endpoint = batchConfig.endpoint || 'http://127.0.0.1:8080/api/v1/sql/job';
     batchConfig.inlineExecution = batchConfig.inlineExecution || false;
     batchConfig.hostHeaderTemplate = batchConfig.hostHeaderTemplate || '{{=it.username}}.localhost.lan';
     this.batchConfig = batchConfig;
-}
+};
 
-module.exports = AnalysisBackend;
+AnalysisBackend.prototype.setLoggerConfig = function (options) {
+    var loggerConfig = options || {};
+    loggerConfig.filename = loggerConfig.filename;
+
+    this.loggerConfig = loggerConfig;
+};
 
 AnalysisBackend.prototype.create = function(analysisConfiguration, analysisDefinition, callback) {
     analysisConfiguration.batch.endpoint = this.batchConfig.endpoint;
     analysisConfiguration.batch.inlineExecution = this.batchConfig.inlineExecution;
     analysisConfiguration.batch.hostHeaderTemplate = this.batchConfig.hostHeaderTemplate;
+    analysisConfiguration.logger = {
+        stream: this.loggerConfig.filename ? fs.createWriteStream(this.loggerConfig.filename) : process.stdout
+    };
 
     camshaft.create(analysisConfiguration, analysisDefinition, callback);
 };

lib/cartodb/server.js

@@ -147,6 +147,7 @@ module.exports = function(serverOptions) {
     var tileBackend = new windshaft.backend.Tile(rendererCache);
     var mapValidatorBackend = new windshaft.backend.MapValidator(tileBackend, attributesBackend);
     var mapBackend = new windshaft.backend.Map(rendererCache, mapStore, mapValidatorBackend);
+
     var analysisBackend = new AnalysisBackend(serverOptions.analysis);
 
     var layergroupAffectedTablesCache = new LayergroupAffectedTablesCache();

lib/cartodb/server_options.js

@@ -36,6 +36,9 @@ var analysisConfig = _.defaults(global.environment.analysis || {}, {
         inlineExecution: false,
         endpoint: 'http://127.0.0.1:8080/api/v2/sql/job',
         hostHeaderTemplate: '{{=it.username}}.localhost.lan'
+    },
+    logger: {
+        filename: undefined
     }
 });
 
@@ -95,6 +98,9 @@ module.exports = {
             inlineExecution: analysisConfig.batch.inlineExecution,
             endpoint: analysisConfig.batch.endpoint,
             hostHeaderTemplate: analysisConfig.batch.hostHeaderTemplate
+        },
+        logger: {
+            filename: analysisConfig.logger.filename
         }
     },
     // Do not send unwatch on release. See http://github.com/CartoDB/Windshaft-cartodb/issues/161