Simple logging api inspired by Python logging module

[fnpeditor.git] / src / fnpjs / logging / logging.js

diff --git a/src/fnpjs/logging/logging.js b/src/fnpjs/logging/logging.js
new file mode 100644 (file)
index 0000000..e68302d
--- /dev/null
+++ b/src/fnpjs/logging/logging.js
@@ -0,0 +1,81 @@
+define(function(require) {
+    
+'use strict';
+
+var _ = require('libs/underscore'),
+    handlers = require('fnpjs/logging/handlers'),
+    config = {},
+    levels = ['debug', 'info', 'warning', 'error', 'critical'];
+
+
+var Logger = function(name) {
+    this.name = name;
+    Object.defineProperty(this, 'config', {
+        get: function() {
+            return _.extend({
+                propagate: true,
+                level: 'warn',
+                handlers: []
+            }, config.loggers[name] || {});
+        }
+    });
+};
+
+_.extend(Logger.prototype, {
+    log: function(level, message, data) {
+        if(levels.indexOf(level) !== -1 && levels.indexOf(level) >= levels.indexOf(this.config.level)) {
+            this.config.handlers.forEach(function(handlerName) {
+                var handlerConfig = config.handlers[handlerName],
+                    handler = handlerConfig.handler,
+                    handlerLevel = handlerConfig.level || 'info';
+
+                if(typeof handler === 'string') {
+                    handler = handlers[handlerConfig.handler];
+                }
+                if(!handler) {
+                    throw new Error('Unknown handler: ' + handlerName);
+                }
+
+                if(levels.indexOf(handlerLevel) !== -1 && levels.indexOf(level) >= levels.indexOf(handlerLevel)) {
+                    handler(message, level, data);
+                }
+            });
+        }
+        if(this.config.propagate && this.name) {
+            var logger = new Logger(this.name.split('.').slice(0, -1).join('.'));
+            logger.log(level, message, data);
+        }
+    },
+    exception: function(e) {
+        this.log('error', e.toString(), {exception: e});
+    }
+});
+
+levels.forEach(function(level) {
+    Logger.prototype[level] = function(message, data) {
+        return this.log(level, message, data);
+    };
+});
+
+
+var api = {
+    getLogger: function(name) {
+        return new Logger(name);
+    },
+    setConfig: function(_config) {
+        config = _.extend({
+            handlers: [],
+            loggers: []
+        } ,_config);
+    },
+    clearConfig: function() {
+        this.setConfig({});
+    }
+};
+
+api.clearConfig();
+
+
+return api;
+
+});