93 lines
2.2 KiB
JavaScript
93 lines
2.2 KiB
JavaScript
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const debug = require('debug')('log4js:tcp');
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const net = require('net');
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function appender(config, layout) {
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let canWrite = false;
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const buffer = [];
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let socket;
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let shutdownAttempts = 3;
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let endMsg = '__LOG4JS__';
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function write(loggingEvent) {
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debug('Writing log event to socket');
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canWrite = socket.write(`${layout(loggingEvent)}${endMsg}`, 'utf8');
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}
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function emptyBuffer() {
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let evt;
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debug('emptying buffer');
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while ((evt = buffer.shift())) {
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write(evt);
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}
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}
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function createSocket() {
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debug(
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`appender creating socket to ${config.host || 'localhost'}:${
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config.port || 5000
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}`
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);
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endMsg = `${config.endMsg || '__LOG4JS__'}`;
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socket = net.createConnection(
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config.port || 5000,
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config.host || 'localhost'
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);
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socket.on('connect', () => {
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debug('socket connected');
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emptyBuffer();
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canWrite = true;
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});
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socket.on('drain', () => {
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debug('drain event received, emptying buffer');
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canWrite = true;
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emptyBuffer();
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});
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socket.on('timeout', socket.end.bind(socket));
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socket.on('error', (e) => {
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debug('connection error', e);
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canWrite = false;
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emptyBuffer();
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});
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socket.on('close', createSocket);
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}
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createSocket();
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function log(loggingEvent) {
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if (canWrite) {
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write(loggingEvent);
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} else {
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debug('buffering log event because it cannot write at the moment');
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buffer.push(loggingEvent);
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}
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}
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log.shutdown = function (cb) {
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debug('shutdown called');
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if (buffer.length && shutdownAttempts) {
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debug('buffer has items, waiting 100ms to empty');
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shutdownAttempts -= 1;
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setTimeout(() => {
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log.shutdown(cb);
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}, 100);
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} else {
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socket.removeAllListeners('close');
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socket.end(cb);
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}
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};
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return log;
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}
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function configure(config, layouts) {
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debug(`configure with config = ${config}`);
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let layout = function (loggingEvent) {
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return loggingEvent.serialise();
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};
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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 appender(config, layout);
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}
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module.exports.configure = configure;
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