Firebase Update

express-server/node_modules/log-driver/index.js

@@ -0,0 +1,60 @@
+var util = require('util');
+
+var LogDriver = function(options){
+  options = options || {};
+  var logger = this;
+  if (options.format){
+    this.format = options.format;
+  }
+  this.levels = options.levels || ['error', 'warn', 'info', 'debug', 'trace'];
+  if (options.level === false){
+    this.level = false;  // don't log anything
+  } else {
+    this.level = options.level || this.levels[this.levels.length - 1];
+    if (this.levels.indexOf(this.level) === -1){
+      throw new Error("Log level '" +
+                      this.level +
+                      "' does not exist in level list '" + JSON.stringify() + "'");
+    }
+  }
+  this.levels.forEach(function(level){
+    if (logLevelShouldOutput(level, logger.level, logger.levels)){
+      logger[level] = function(){
+        var args = Array.prototype.slice.call(arguments);
+        args.unshift(level);  // log level is added as the first parameter
+        console.log(logger.format.apply(logger, args));
+      };
+    } else {
+      logger[level] = function(){/* no-op, because this log level is ignored */};
+    }
+  });
+};
+
+var logLevelShouldOutput = function(logLevel, configuredLevel, levels){
+  if (configuredLevel === false){
+    return false;
+  }
+  return (levels.indexOf(logLevel) <= levels.indexOf(configuredLevel));
+};
+
+LogDriver.prototype.format = function(){
+  var args = Array.prototype.slice.call(arguments, [1]); // change arguments to an array, but
+                                                         // drop the first item (log level)
+  var out = "[" + arguments[0] + "] " + JSON.stringify(new Date()) + " ";
+  args.forEach(function(arg){
+    out += " " + util.inspect(arg);
+  });
+  return out;
+};
+
+var defaultLogger = null;
+
+var factory = function(options){
+  defaultLogger = new LogDriver(options);
+  factory.logger = defaultLogger;
+  return defaultLogger;
+};
+
+factory();
+
+module.exports = factory;