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node-red/red/log.js

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/**
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* Copyright 2014, 2015 IBM Corp.
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*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
**/
var util = require("util");
var EventEmitter = require("events").EventEmitter;
var levels = {
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off: 1,
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fatal: 10,
error: 20,
warn: 30,
info: 40,
debug: 50,
trace: 60,
metric: 99
};
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var levelNames = {
10: "fatal",
20: "error",
30: "warn",
40: "info",
50: "debug",
60: "trace",
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99: "metric"
};
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var logHandlers = [];
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var metricsEnabled = false;
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var ConsoleLogHandler = function(settings) {
this.logLevel = levels[settings.level]||levels.info;
this.metricsOn = settings.metrics||false;
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metricsEnabled = this.metricsOn;
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this.on("log",function(msg) {
/* istanbul ignore else */
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if (this.shouldReportMessage(msg.level)) {
if (msg.level == log.METRIC) {
util.log("[metric] "+JSON.stringify(msg));
} else {
util.log("["+levelNames[msg.level]+"] "+(msg.type?"["+msg.type+":"+(msg.name||msg.id)+"] ":"")+msg.msg);
}
}
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});
}
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util.inherits(ConsoleLogHandler, EventEmitter);
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ConsoleLogHandler.prototype.shouldReportMessage = function(msglevel) {
return msglevel <= this.logLevel || (msglevel == log.METRIC && this.metricsOn);
}
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var log = module.exports = {
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FATAL: 10,
ERROR: 20,
WARN: 30,
INFO: 40,
DEBUG: 50,
TRACE: 60,
METRIC: 99,
init: function(settings) {
logHandlers = [];
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var consoleSettings = {};
if (settings.logging) {
consoleSettings = settings.logging.console || {};
}
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log.addHandler(new ConsoleLogHandler(consoleSettings));
},
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addHandler: function(func) {
logHandlers.push(func);
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},
log: function(msg) {
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msg.timestamp = Date.now();
logHandlers.forEach(function(handler) {
handler.emit("log",msg);
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});
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},
info: function(msg) {
log.log({level:log.INFO,msg:msg});
},
warn: function(msg) {
log.log({level:log.WARN,msg:msg});
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},
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error: function(msg) {
log.log({level:log.ERROR,msg:msg});
},
trace: function(msg) {
log.log({level:log.TRACE,msg:msg});
},
debug: function(msg) {
log.log({level:log.DEBUG,msg:msg});
},
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metric: function() {
return metricsEnabled;
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}
}