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index.js
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index.js
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'use strict'
const { sun, linux, windows, v8 } = require('./platform')
const debug = require('debug')('0x')
const { join, isAbsolute, relative } = require('path')
const fs = require('fs')
const validate = require('./lib/validate')(require('./schema.json'))
const traceStacksToTicks = require('./lib/trace-stacks-to-ticks')
const v8LogToTicks = require('./lib/v8-log-to-ticks')
const ticksToTree = require('./lib/ticks-to-tree')
const render = require('./lib/render')
const { pathTo } = require('./lib/util')
const platform = process.platform
const { tidy, noop, isSudo } = require('./lib/util')
module.exports = zeroEks
async function zeroEks (args) {
args.name = args.name || 'flamegraph'
args.status = args.status || noop
args.pathToNodeBinary = args.pathToNodeBinary || process.execPath
if (args.pathToNodeBinary === 'node') {
args.pathToNodeBinary = pathTo('node')
}
validate(args)
const { collectOnly, visualizeOnly, writeTicks, treeDebug, mapFrames } = args
if (collectOnly && visualizeOnly) {
throw Error('"collect only" and "visualize only" cannot be used together')
}
if (visualizeOnly) return visualize(args)
args.title = args.title || `node ${args.argv.join(' ')}`
var { ticks, pid, folder, inlined } = await startProcessAndCollectTraceData(args)
if (treeDebug === true) {
const tree = await ticksToTree(ticks, {
mapFrames, inlined, pathToNodeBinary: args.pathToNodeBinary
})
fs.writeFileSync(`${folder}/stacks.${pid}.json`, JSON.stringify(tree, 0, 2))
}
if (writeTicks) {
fs.writeFileSync(`${folder}/ticks.json`, JSON.stringify(ticks))
}
fs.writeFileSync(`${folder}/meta.json`, JSON.stringify({ ...args, inlined }))
if (collectOnly === true) {
debug('collect-only mode bailing on rendering')
tidy()
debug('done')
return folder
}
try {
const file = generateFlamegraph({ ...args, ticks, inlined, pid, folder })
return file
} catch (err) {
tidy()
throw err
}
}
async function startProcessAndCollectTraceData (args) {
if (!Array.isArray(args.argv)) {
throw Error('argv option is required')
}
args.name = args.name || 'flamegraph'
switch (args.kernelTracing ? platform : 'v8') {
case 'v8': return v8(args).catch((err) => {
const logFilePath = join(args.workingDir, v8.getIsolateLog(args.workingDir, args.pid))
let message = 'Fatal error in process observed by 0x. Incomplete V8 isolate log '
if (process.env.DEBUG && process.env.DEBUG.includes('0x')) {
message += `is readable for debugging at ${logFilePath}`
} else {
fs.unlinkSync(logFilePath)
message += 'deleted. To preserve these logs, enable debugging (e.g. `DEBUG=0x* 0x my-app.js`)'
}
if (!args.quiet && !args.silent) console.warn(message)
throw err
})
case 'linux': return linux(args, await isSudo())
case 'win32': return windows()
default: return sun(args, await isSudo())
}
}
async function generateFlamegraph (opts) {
const file = await render(opts)
tidy()
return file
}
async function visualize ({ visualizeOnly, treeDebug, workingDir, title, mapFrames, open, name, pathToNodeBinary }) {
try {
const folder = isAbsolute(visualizeOnly)
? relative(workingDir, visualizeOnly)
: visualizeOnly
const ls = fs.readdirSync(folder)
const traceFile = /^stacks\.(.*)\.out$/
const isolateLog = /^isolate-((0x)?[0-9A-Fa-f]{2,16})-(.*)-v8\.(log|json)$/
const stacks = ls.find((f) => isolateLog.test(f) || traceFile.test(f))
if (!stacks) {
throw Error('Invalid data path provided (no stacks or v8 log file found)')
}
var meta
try {
meta = JSON.parse(fs.readFileSync(join(folder, 'meta.json')))
} catch (e) {
meta = {}
debug(e)
}
const srcType = isolateLog.test(stacks) ? 'v8' : 'kernel-tracing'
const rx = (srcType === 'v8') ? isolateLog : traceFile
const pid = rx.exec(stacks)[srcType === 'v8' ? 2 : 1]
const { inlined } = meta
const src = join(folder, stacks)
title = title || meta.title
name = name || meta.name
const ticks = (srcType === 'v8')
? await v8LogToTicks(src, pathToNodeBinary)
: traceStacksToTicks(src)
if (treeDebug === true) {
const tree = await ticksToTree(ticks, {
mapFrames, inlined, pathToNodeBinary
})
fs.writeFileSync(`${folder}/stacks.${pid}.json`, JSON.stringify(tree, 0, 2))
}
const file = await generateFlamegraph({
visualizeOnly,
treeDebug,
workingDir,
title,
name,
mapFrames,
open,
ticks,
inlined,
pid,
folder,
pathToNodeBinary
})
return file
} catch (e) {
if (e.code === 'ENOENT') {
throw Error('Invalid data path provided (unable to access/does not exist)')
}
if (e.code === 'ENOTDIR') {
throw Error('Invalid data path provided (not a directory)')
}
throw e
}
}