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'use strict';
const { spawn } = require('node:child_process');
const path = require('node:path');
const { inspect } = require('node:util');
function parseInteger(value, defaultValue, name, minimum) {
if (value === undefined) return defaultValue;
if (!/^(?:0|[1-9]\d*)$/.test(value)) {
throw new TypeError(`${name} must be an integer`);
}
const number = Number(value);
if (!Number.isSafeInteger(number) || number < minimum) {
throw new RangeError(`${name} must be at least ${minimum}`);
}
return number;
}
function parseNumber(value, defaultValue, name, minimum) {
if (value === undefined) return defaultValue;
if (value.trim() === '') throw new TypeError(`${name} must be a number`);
const number = Number(value);
if (!Number.isFinite(number)) throw new TypeError(`${name} must be a number`);
if (number < minimum) {
throw new RangeError(`${name} must be at least ${minimum}`);
}
return number;
}
function csvEncode(value) {
if (typeof value === 'number' || typeof value === 'boolean') {
return String(value);
}
const string = String(value);
return `"${string.replace(/"/g, '""')}"`;
}
function formatConfiguration(params) {
return Object.keys(params)
.map((key) => `${key}=${inspect(params[key])}`)
.join(' ');
}
function durationToSeconds(duration) {
if (!/^\d+$/.test(duration)) {
throw new TypeError(`Invalid benchmark duration '${duration}'`);
}
const padded = duration.padStart(10, '0');
return `${padded.slice(0, -9)}.${padded.slice(-9)}`;
}
function runBenchmark(binary, file, options) {
const args = [
...options.nodeArgs,
'--no-warnings',
'--experimental-bench',
'--bench',
'--bench-reporter=json',
'--bench-samples=1',
`--bench-warmup=${options.warmup}`,
];
if (options.namePattern !== undefined) {
args.push(`--bench-name-pattern=${options.namePattern}`);
}
args.push('--', path.resolve(file));
return new Promise((resolve, reject) => {
const child = spawn(binary, args, {
env: process.env,
stdio: ['ignore', 'pipe', 'pipe'],
});
child.stdout.setEncoding('utf8');
child.stderr.setEncoding('utf8');
let stdout = '';
let stderr = '';
child.stdout.on('data', (data) => { stdout += data; });
child.stderr.on('data', (data) => { stderr += data; });
child.once('error', reject);
child.once('close', (code, signal) => {
let records;
try {
records = stdout.trim().split('\n')
.filter((line) => line.length > 0)
.map((line) => JSON.parse(line));
} catch (error) {
reject(new Error(
`Could not parse benchmark output from '${binary}': ${error.message}`,
{ cause: error },
));
return;
}
const summary = records.findLast(
({ type }) => type === 'bench:summary')?.data;
if (code !== 0 || signal !== null || summary?.success !== true) {
const diagnostics = records
.filter(({ type }) => type === 'bench:diagnostic')
.map(({ data }) => data.message)
.join('\n');
const status = signal === null ? `exit code ${code}` : `signal ${signal}`;
const details = stderr || diagnostics;
reject(new Error(
`Benchmark '${file}' failed with ${status}` +
(details ? `:\n${details}` : ''),
));
return;
}
const samples = [];
for (const record of records) {
if (record.type !== 'bench:complete' ||
record.data.skip !== undefined) {
continue;
}
if (record.data.error !== undefined) {
reject(new Error(
`Benchmark '${record.data.name}' failed: ` +
record.data.error.message,
));
return;
}
if (record.data.samples.length !== 1) {
reject(new Error(
`Benchmark '${record.data.name}' did not produce exactly one sample`,
));
return;
}
const sample = record.data.samples[0];
if (!Number.isFinite(sample.rate)) {
reject(new Error(
`Benchmark '${record.data.name}' produced a non-finite rate`,
));
return;
}
samples.push({
configuration: formatConfiguration(record.data.params),
duration: durationToSeconds(sample.duration_ns),
identity: record.data.benchId,
logicalIdentity: JSON.stringify([
record.data.file,
record.data.parentId,
record.data.name,
]),
name: record.data.name,
params: record.data.params,
rate: sample.rate,
});
}
resolve(samples);
});
});
}
module.exports = {
csvEncode,
parseInteger,
parseNumber,
runBenchmark,
};