From 18f5471aa32154f97b97652b2f932f114c129f17 Mon Sep 17 00:00:00 2001 From: Benjamin Coe Date: Wed, 25 Oct 2017 23:42:18 -0700 Subject: [PATCH] feat: playing around with initial implementation --- .gitignore | 2 + LICENSE.txt | 14 ++ README.md | 24 ++ bin/c8.js | 10 + bin/wrap.js | 52 +++++ index.js | 0 package-lock.json | 536 +++++++++++++++++++++++++++++++++++++++++++++ package.json | 30 +++ test/fixtures/a.js | 16 ++ test/fixtures/b.js | 11 + 10 files changed, 695 insertions(+) create mode 100644 .gitignore create mode 100644 LICENSE.txt create mode 100644 README.md create mode 100755 bin/c8.js create mode 100755 bin/wrap.js create mode 100644 index.js create mode 100644 package-lock.json create mode 100644 package.json create mode 100644 test/fixtures/a.js create mode 100644 test/fixtures/b.js diff --git a/.gitignore b/.gitignore new file mode 100644 index 00000000..9daa8247 --- /dev/null +++ b/.gitignore @@ -0,0 +1,2 @@ +.DS_Store +node_modules diff --git a/LICENSE.txt b/LICENSE.txt new file mode 100644 index 00000000..629264e9 --- /dev/null +++ b/LICENSE.txt @@ -0,0 +1,14 @@ +Copyright (c) 2017, Contributors + +Permission to use, copy, modify, and/or distribute this software +for any purpose with or without fee is hereby granted, provided +that the above copyright notice and this permission notice +appear in all copies. + +THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES +WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES +OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE +LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES +OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, +WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, +ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. diff --git a/README.md b/README.md new file mode 100644 index 00000000..fe969872 --- /dev/null +++ b/README.md @@ -0,0 +1,24 @@ +# c8 - native code-coverage + +Code-coverage using [v8's Profiler](https://nodejs.org/dist/latest-v8.x/docs/api/inspector.html) +compatible with [Istanbul's reporters](https://istanbul.js.org/docs/advanced/alternative-reporters/). + +Like [nyc](https://github.com/istanbuljs/nyc), c8 just magically works, simply: + +```bash +npm i c8 -g +c8 node foo.js +``` + +The above example will collect coverage for `foo.js` using v8's profiler. + +TODO: + +- [ ] write logic for converting v8 coverage output to [Istanbul Coverage.json format](https://github.com/gotwarlost/istanbul/blob/master/coverage.json.md). +- [ ] talk to Node.js project about silencing messages: + + > `Debugger listening on ws://127.0.0.1:56399/e850110a-c5df-41d8-8ef2-400f6829617f`. + +- [ ] figure out why `detailed` mode does not appear to be working. +- [ ] figure out a better way to determine that all processes in event loop + have terminated (except the inspector session). diff --git a/bin/c8.js b/bin/c8.js new file mode 100755 index 00000000..c62b7f25 --- /dev/null +++ b/bin/c8.js @@ -0,0 +1,10 @@ +#!/usr/bin/env node + +const argv = require('yargs').parse() +const foreground = require('foreground-child') +const sw = require('spawn-wrap') + +if (argv._.length) { + sw([require.resolve('./wrap')]) + foreground(process.argv.slice(2)) +} diff --git a/bin/wrap.js b/bin/wrap.js new file mode 100755 index 00000000..2778cb43 --- /dev/null +++ b/bin/wrap.js @@ -0,0 +1,52 @@ +const fs = require('fs') +const sw = require('spawn-wrap') +const CRI = require('chrome-remote-interface'); +const getPort = require('get-port'); +const inspector = require('inspector') + +// if there are N or less active handles +// in the event loop, dump coverage and exit. +const EXIT_HANDLE_COUNT = 4 + +getPort().then(async port => { + // start an inspector session on an unused port. + inspector.open(port, true) + const client = await CRI({port: port}) + const {Profiler} = client + await Profiler.enable() + await Profiler.startPreciseCoverage({callCount: true, detailed: true}) + + // run the original "main" now that we've started the inspector. + sw.runMain() + + // wait for everything in event loop to terminate + // except for inspector session. + setInterval(() => { + const handleCount = process._getActiveHandles().length + + process._getActiveRequests().length + if (handleCount <= EXIT_HANDLE_COUNT) { + outputCoverageAndExit(client, Profiler) + } + }, 100) +}).catch(err => { + throw err +}) + +async function outputCoverageAndExit (client, Profiler) { + const IGNORED_PATHS = [ + /\/bin\/wrap.js/, + /\/node_modules\//, + /node-spawn-wrap/ + ] + let {result} = await Profiler.takePreciseCoverage() + result = result.filter(coverage => { + for (var ignored, i = 0; (ignored = IGNORED_PATHS[i]) !== undefined; i++) { + if (ignored.test(coverage.url)) return false + } + if (!/^\//.test(coverage.url)) return false + else return true + }) + console.log(JSON.stringify(result, null, 2)) + client.close() + process.exit(0) +} diff --git a/index.js b/index.js new file mode 100644 index 00000000..e69de29b diff --git a/package-lock.json b/package-lock.json new file mode 100644 index 00000000..5f7b7188 --- /dev/null +++ b/package-lock.json @@ -0,0 +1,536 @@ +{ + "name": "c8", + "version": "1.0.0", + "lockfileVersion": 1, + "requires": true, + "dependencies": { + "ansi-regex": { + "version": "2.1.1", + "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-2.1.1.tgz", + "integrity": "sha1-w7M6te42DYbg5ijwRorn7yfWVN8=" + }, + "async-limiter": 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}, + "author": "Ben Coe ", + "license": "ISC", + "dependencies": { + "chrome-remote-interface": "^0.25.2", + "foreground-child": "^1.5.6", + "get-port": "^3.2.0", + "spawn-wrap": "^1.3.8", + "yargs": "^10.0.3" + } +} diff --git a/test/fixtures/a.js b/test/fixtures/a.js new file mode 100644 index 00000000..15c6769a --- /dev/null +++ b/test/fixtures/a.js @@ -0,0 +1,16 @@ +require('./b') + +console.info('i am a line of code') + +function apple (awesome) { + if (false || true) { + console.info('what') + } + if (true || false) { + console.log('hey') + } +} + +apple() +apple() +apple() diff --git a/test/fixtures/b.js b/test/fixtures/b.js new file mode 100644 index 00000000..46f315c9 --- /dev/null +++ b/test/fixtures/b.js @@ -0,0 +1,11 @@ +function cool () { + +} + +function awesome () { + console.log('hey') +} + +setTimeout(() => { + cool() +}, 500)