Accept "--default-timeout" option for connections with engines

lib/default-configs.js

@@ -91,6 +91,7 @@ function defineDefaultConfigs(configs) {
   // node and it is guaranteed that this computer can be accessed with
   // the host name.
   define(configs, 'engine.receive_host',    engineConfigs.host);
+  define(configs, 'engine.default_timeout', engineConfigs.default_timeout);
 
   return configs;
 }

lib/option-utils.js

@@ -21,6 +21,11 @@ function intOption(newValue, oldValue) {
 }
 exports.intOption = intOption;
 
+function floatOption(newValue, oldValue) {
+  return parseFloat(newValue);
+}
+exports.floatOption = floatOption;
+
 function stringsOption(newValue, oldValue) {
   return normalizeStringArray(newValue);
 }

lib/server-options.js

@@ -23,6 +23,7 @@ options.droongaEnginePort      = defaultConfigs.engine.port;
 options.tag                    = defaultConfigs.engine.tag;
 options.defaultDataset         = defaultConfigs.engine.default_dataset;
 options.receiveHostName        = defaultConfigs.engine.receive_host;
+options.defaultTimeout         = defaultConfigs.engine.default_timeout;
 
 function generateOptionHandler(onHandle, converter) {
   return function(newValue, oldValue) {
@@ -67,6 +68,9 @@ function define() {
       'The default dataset (' + options.defaultDataset + ')');
   add('--tag <tag>',
       'The tag (' + options.tag + ')');
+  add('--default-timeout <timeout>',
+      'Time to terminate unresponsive connections (in seconds) (' + options.defaultTimeout + ')',
+      optionUtils.floatOption);
   add('--access-log-file <file>',
       'Output access logs to <file>. ' +
         'You can use "-" as <file> to output to the standard output. ' +