115 lines
3.0 KiB
JavaScript
115 lines
3.0 KiB
JavaScript
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'use strict';
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var layouts = require('../layouts')
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, loggly = require('loggly')
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, os = require('os')
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, passThrough = layouts.messagePassThroughLayout
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, openRequests = 0
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, shutdownCB;
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function isAnyObject(value) {
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return value !== null && (typeof value === 'object' || typeof value === 'function');
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}
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function numKeys(o) {
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var res = 0;
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for (var k in o) {
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if (o.hasOwnProperty(k)) res++;
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}
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return res;
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}
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/**
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* @param msg - array of args for logging.
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* @returns { deTaggedMsg: [], additionalTags: [] }
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*/
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function processTags(msgListArgs) {
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var msgList = (msgListArgs.length === 1 ? [msgListArgs[0]] : Array.apply(null, msgListArgs));
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return msgList.reduce(function (accum, element, currentIndex, array) {
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if (isAnyObject(element) && Array.isArray(element.tags) && numKeys(element) == 1) {
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accum.additionalTags = accum.additionalTags.concat(element.tags);
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} else {
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accum.deTaggedData.push(element);
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}
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return accum;
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}, { deTaggedData: [], additionalTags: [] });
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}
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/**
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* Loggly Appender. Sends logging events to Loggly using node-loggly, optionally adding tags.
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*
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* This appender will scan the msg from the logging event, and pull out any argument of the
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* shape `{ tags: [] }` so that it's possibleto add tags in a normal logging call.
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*
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* For example:
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*
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* logger.info({ tags: ['my-tag-1', 'my-tag-2'] }, 'Some message', someObj, ...)
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*
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* And then this appender will remove the tags param and append it to the config.tags.
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*
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* @param config object with loggly configuration data
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* {
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* token: 'your-really-long-input-token',
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* subdomain: 'your-subdomain',
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* tags: ['loggly-tag1', 'loggly-tag2', .., 'loggly-tagn']
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* }
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* @param layout a function that takes a logevent and returns a string (defaults to objectLayout).
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*/
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function logglyAppender(config, layout) {
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var client = loggly.createClient(config);
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if(!layout) layout = passThrough;
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return function(loggingEvent) {
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var result = processTags(loggingEvent.data);
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var deTaggedData = result.deTaggedData;
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var additionalTags = result.additionalTags;
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// Replace the data property with the deTaggedData
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loggingEvent.data = deTaggedData;
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var msg = layout(loggingEvent);
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openRequests++;
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client.log({
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msg: msg,
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level: loggingEvent.level.levelStr,
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category: loggingEvent.categoryName,
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hostname: os.hostname().toString(),
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}, additionalTags, function (error, result) {
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if (error) {
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console.error("log4js.logglyAppender - error occurred: ", error);
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}
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openRequests--;
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if (shutdownCB && openRequests === 0) {
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shutdownCB();
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shutdownCB = undefined;
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}
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});
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};
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}
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function configure(config) {
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var layout;
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if (config.layout) {
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layout = layouts.layout(config.layout.type, config.layout);
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}
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return logglyAppender(config, layout);
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}
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function shutdown (cb) {
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if (openRequests === 0) {
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cb();
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} else {
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shutdownCB = cb;
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}
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}
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exports.name = 'loggly';
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exports.appender = logglyAppender;
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exports.configure = configure;
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exports.shutdown = shutdown;
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