This was typed up quickly from memory. I haven't tested this code yet, but you get the general idea. I'm also brand new at JavaScript so please don't judge.
'use strict'
var cluster = require('cluster');
var spawn = require('child_process').spawn;
var stream = require('stream');
var glob = require('glob');
var files = glob.sync('/data/logs/*.log.gz');
function Parser() {
var t = new stream.Transform( { objectMode: true } );
var transform = t._transform;
var flush = t._flush;
var parse = t.parse;
return t;
}
function transform(chunk, enc, done) {
var data = chunk.toString();
//if flush gives us remaining data from last line, prepend to next
+ chunk
if (this._lastLineData) data = this._lastLineData + data;
var lines = data.split('\n');
this._lastLineData = lines[lines.length-1];
for (var i = 0; i < lines.length; i++) {
this.push(parse.lines[i]);
}
done();
}
function flush(done) {
//If remaining data, pass to transform to prepend to next chunk
if (this._lastLineData) this.push(this._lastLineData);
this._lastLineData = null
done()
}
function parse(line) {
//Split line into fields, or apply regex to filter results
return line;
}
if (cluster.isMaster) {
var workers = 24; // number of CPUs
var logsPerWorker = workers / files;
var remainder = workers % files;
var logSlice {};
var sliceStart = 0;
var sliceEnd = 0;
for (var i = 0; i < workers; i++) {
if (remainder) {
sliceEnd++;
remainder--;
}
logSlice[i] = files.slice(sliceStart,sliceEnd);
sliceStart++;
sliceEnd = sliceStart;
if (logsPerWorker === 0 && remainder === 0) {
//if no more logs to distribute, break out of loop
break;
}
}
for (var i = 0; i < workers; i++) {
//Fork and pass list of logs for child to process
cluster.fork({logs: logSlice[i]});
}
} else {
var liner = Parser();
var logs = split.env.logs(','); //read logs passed by parent
for (var i = 0; i < logs.length; i++){
var child = spawn('zcat', [ logs[i] ]);
child.stdout.pipe(liner); //pipe this to stdout or to writeStr
+eam to write to a file
}
}
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