/
app.js
96 lines (83 loc) · 2.4 KB
/
app.js
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import split from 'split2';
import { Transform } from 'stream';
import saveData from './db.js';
const logToObject = (logLine) => logLine.split(' | ').reduce((parsed, pairWord) => {
const [key, value] = pairWord.split(': ');
if (key && value) return { ...parsed, [key]: value };
return parsed;
}, {});
const calculateStats = (tags, parsed, init = {}) => tags.reduce((processed, tagName) => {
if (parsed[tagName] && parsed.duration) {
const duration = parseFloat(parsed.duration);
const operationType = parsed.operationType.toLowerCase();
if (processed[tagName] && processed[tagName][parsed[tagName]]) {
const record = processed[tagName][parsed[tagName]];
const count = record.count + 1;
const totalDuration = record.totalDuration + duration;
const averageDuration = totalDuration / count;
return {
...processed,
[tagName]: {
...processed[tagName],
[parsed[tagName]]: {
...processed[tagName][parsed[tagName]],
count,
operationType,
totalDuration,
averageDuration,
...(duration > record.maxDuration && { maxDuration: duration }),
...(duration < record.minDuration && { minDuration: duration }),
},
},
};
}
return {
...processed,
[tagName]: {
...processed[tagName],
[parsed[tagName]]: {
count: 1,
operationType,
totalDuration: duration,
averageDuration: duration,
maxDuration: duration,
minDuration: duration,
},
},
};
}
return processed;
}, init);
class StatsAggregator extends Transform {
constructor() {
super({ defaultEncoding: 'utf8' });
this.output = {};
}
_transform(chunk, _, next) {
this.output = calculateStats(
['operation', 'operationType'],
logToObject(chunk.toString()),
this.output,
);
next();
}
_flush() {
console.log('operation types:');
console.table(this.output.operationType, [
'count',
'averageDuration',
'maxDuration',
'minDuration',
]);
console.log('operations:');
console.table(this.output.operation, [
'count',
'averageDuration',
'maxDuration',
'minDuration',
'operationType',
]);
saveData(this.output.operation);
}
}
process.stdin.pipe(split()).pipe(new StatsAggregator());