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[test visibility] Simple dynamic instrumentation - test visibility client #4826
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'use strict' | ||
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const { join } = require('path') | ||
const { Worker } = require('worker_threads') | ||
const { randomUUID } = require('crypto') | ||
const log = require('../../log') | ||
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const probeIdToResolveBreakpointSet = new Map() | ||
const probeIdToResolveBreakpointHit = new Map() | ||
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class TestVisDynamicInstrumentation { | ||
constructor () { | ||
this.worker = null | ||
this._readyPromise = new Promise(resolve => { | ||
this._onReady = resolve | ||
}) | ||
this.breakpointSetChannel = new MessageChannel() | ||
this.breakpointHitChannel = new MessageChannel() | ||
} | ||
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// Return 3 elements: | ||
// 1. Snapshot ID | ||
// 2. Promise that's resolved when the breakpoint is set | ||
// 3. Promise that's resolved when the breakpoint is hit | ||
addLineProbe ({ file, line }) { | ||
const snapshotId = randomUUID() | ||
const probeId = randomUUID() | ||
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this.breakpointSetChannel.port2.postMessage({ | ||
snapshotId, | ||
probe: { id: probeId, file, line } | ||
}) | ||
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return [ | ||
snapshotId, | ||
new Promise(resolve => { | ||
probeIdToResolveBreakpointSet.set(probeId, resolve) | ||
}), | ||
new Promise(resolve => { | ||
probeIdToResolveBreakpointHit.set(probeId, resolve) | ||
}) | ||
] | ||
} | ||
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isReady () { | ||
return this._readyPromise | ||
There was a problem hiding this comment. Choose a reason for hiding this commentThe reason will be displayed to describe this comment to others. Learn more. this is just to make sure we don't attempt to set probes before the worker is online |
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} | ||
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start () { | ||
if (this.worker) return | ||
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const { NODE_OPTIONS, ...envWithoutNodeOptions } = process.env | ||
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log.debug('Starting Test Visibility - Dynamic Instrumentation client...') | ||
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this.worker = new Worker( | ||
join(__dirname, 'worker', 'index.js'), | ||
{ | ||
execArgv: [], | ||
env: envWithoutNodeOptions, | ||
workerData: { | ||
breakpointSetChannel: this.breakpointSetChannel.port1, | ||
breakpointHitChannel: this.breakpointHitChannel.port1 | ||
}, | ||
transferList: [this.breakpointSetChannel.port1, this.breakpointHitChannel.port1] | ||
} | ||
) | ||
this.worker.on('online', () => { | ||
log.debug('Test Visibility - Dynamic Instrumentation client is ready') | ||
this._onReady() | ||
}) | ||
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// Allow the parent to exit even if the worker is still running | ||
this.worker.unref() | ||
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this.breakpointSetChannel.port2.on('message', (message) => { | ||
const { probeId } = message | ||
const resolve = probeIdToResolveBreakpointSet.get(probeId) | ||
if (resolve) { | ||
resolve() | ||
probeIdToResolveBreakpointSet.delete(probeId) | ||
} | ||
}).unref() | ||
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this.breakpointHitChannel.port2.on('message', (message) => { | ||
const { snapshot } = message | ||
const { probe: { id: probeId } } = snapshot | ||
const resolve = probeIdToResolveBreakpointHit.get(probeId) | ||
if (resolve) { | ||
resolve({ snapshot }) | ||
probeIdToResolveBreakpointHit.delete(probeId) | ||
} | ||
}).unref() | ||
} | ||
} | ||
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module.exports = new TestVisDynamicInstrumentation() |
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'use strict' | ||
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const { workerData: { breakpointSetChannel, breakpointHitChannel } } = require('worker_threads') | ||
// TODO: move debugger/devtools_client/session to common place | ||
const session = require('../../../debugger/devtools_client/session') | ||
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// TODO: move debugger/devtools_client/snapshot to common place | ||
const { getLocalStateForCallFrame } = require('../../../debugger/devtools_client/snapshot') | ||
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// TODO: move debugger/devtools_client/state to common place | ||
const { | ||
findScriptFromPartialPath, | ||
getStackFromCallFrames | ||
} = require('../../../debugger/devtools_client/state') | ||
const log = require('../../../log') | ||
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let sessionStarted = false | ||
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const breakpointIdToSnapshotId = new Map() | ||
const breakpointIdToProbe = new Map() | ||
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session.on('Debugger.paused', async ({ params: { hitBreakpoints: [hitBreakpoint], callFrames } }) => { | ||
const probe = breakpointIdToProbe.get(hitBreakpoint) | ||
if (!probe) { | ||
log.warn(`No probe found for breakpoint ${hitBreakpoint}`) | ||
return session.post('Debugger.resume') | ||
} | ||
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const stack = getStackFromCallFrames(callFrames) | ||
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const getLocalState = await getLocalStateForCallFrame(callFrames[0]) | ||
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await session.post('Debugger.resume') | ||
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const snapshotId = breakpointIdToSnapshotId.get(hitBreakpoint) | ||
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const snapshot = { | ||
id: snapshotId, | ||
timestamp: Date.now(), | ||
probe: { | ||
id: probe.probeId, | ||
version: '0', | ||
location: probe.location | ||
}, | ||
stack, | ||
language: 'javascript' | ||
} | ||
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const state = getLocalState() | ||
if (state) { | ||
snapshot.captures = { | ||
lines: { [probe.location.lines[0]]: { locals: state } } | ||
} | ||
} | ||
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breakpointHitChannel.postMessage({ snapshot }) | ||
}) | ||
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// TODO: add option to remove breakpoint | ||
breakpointSetChannel.on('message', async ({ snapshotId, probe: { id: probeId, file, line } }) => { | ||
await addBreakpoint(snapshotId, { probeId, file, line }) | ||
breakpointSetChannel.postMessage({ probeId }) | ||
}) | ||
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async function addBreakpoint (snapshotId, probe) { | ||
if (!sessionStarted) await start() | ||
const { file, line } = probe | ||
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probe.location = { file, lines: [String(line)] } | ||
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const script = findScriptFromPartialPath(file) | ||
if (!script) throw new Error(`No loaded script found for ${file}`) | ||
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const [path, scriptId] = script | ||
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log.debug(`Adding breakpoint at ${path}:${line}`) | ||
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const { breakpointId } = await session.post('Debugger.setBreakpoint', { | ||
location: { | ||
scriptId, | ||
lineNumber: line - 1 | ||
} | ||
}) | ||
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breakpointIdToProbe.set(breakpointId, probe) | ||
breakpointIdToSnapshotId.set(breakpointId, snapshotId) | ||
} | ||
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function start () { | ||
sessionStarted = true | ||
return session.post('Debugger.enable') // return instead of await to reduce number of promises created | ||
} |
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@@ -32,8 +32,17 @@ module.exports = { | |
.sort(([a], [b]) => a.length - b.length)[0] | ||
}, | ||
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getScriptUrlFromId (id) { | ||
There was a problem hiding this comment. Choose a reason for hiding this commentThe reason will be displayed to describe this comment to others. Learn more.
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return scriptUrls.get(id) | ||
getStackFromCallFrames (callFrames) { | ||
return callFrames.map((frame) => { | ||
let fileName = scriptUrls.get(frame.location.scriptId) | ||
if (fileName.startsWith('file://')) fileName = fileName.substr(7) // TODO: This might not be required | ||
return { | ||
fileName, | ||
function: frame.functionName, | ||
lineNumber: frame.location.lineNumber + 1, // Beware! lineNumber is zero-indexed | ||
columnNumber: frame.location.columnNumber + 1 // Beware! columnNumber is zero-indexed | ||
} | ||
}) | ||
} | ||
} | ||
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'use strict' | ||
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require('../../../../dd-trace/test/setup/tap') | ||
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const { fork } = require('child_process') | ||
const path = require('path') | ||
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const { assert } = require('chai') | ||
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describe('test visibility with dynamic instrumentation', () => { | ||
// Dynamic Instrumentation - Test Visibility not currently supported for windows | ||
if (process.platform === 'win32') { | ||
return | ||
} | ||
let childProcess | ||
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afterEach(() => { | ||
if (childProcess) { | ||
childProcess.kill() | ||
} | ||
}) | ||
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it('can grab local variables', (done) => { | ||
childProcess = fork(path.join(__dirname, 'target-app', 'test-visibility-dynamic-instrumentation-script.js')) | ||
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childProcess.on('message', ({ snapshot: { language, stack, probe, captures }, snapshotId }) => { | ||
assert.exists(snapshotId) | ||
assert.exists(probe) | ||
assert.exists(stack) | ||
assert.equal(language, 'javascript') | ||
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assert.deepEqual(captures, { | ||
lines: { | ||
9: { | ||
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locals: { | ||
a: { type: 'number', value: '1' }, | ||
b: { type: 'number', value: '2' }, | ||
localVar: { type: 'number', value: '1' } | ||
} | ||
} | ||
} | ||
}) | ||
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done() | ||
}) | ||
}) | ||
}) |
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'use strict' | ||
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module.exports = function (a, b) { | ||
// eslint-disable-next-line no-console | ||
const localVar = 1 | ||
if (a > 10) { | ||
throw new Error('a is too big') | ||
} | ||
return a + b + localVar // location of the breakpoint | ||
} |
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'use strict' | ||
There was a problem hiding this comment. Choose a reason for hiding this commentThe reason will be displayed to describe this comment to others. Learn more. ℹ️ script we run in the test to grab local variable data |
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const path = require('path') | ||
const tvDynamicInstrumentation = require('../../../../src/ci-visibility/dynamic-instrumentation') | ||
const sum = require('./di-dependency') | ||
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// keep process alive | ||
const intervalId = setInterval(() => {}, 5000) | ||
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tvDynamicInstrumentation.start() | ||
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tvDynamicInstrumentation.isReady().then(() => { | ||
const [ | ||
snapshotId, | ||
breakpointSetPromise, | ||
breakpointHitPromise | ||
] = tvDynamicInstrumentation.addLineProbe({ file: path.join(__dirname, 'di-dependency.js'), line: 9 }) | ||
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breakpointHitPromise.then(({ snapshot }) => { | ||
// once the breakpoint is hit, we can grab the snapshot and send it to the parent process | ||
process.send({ snapshot, snapshotId }) | ||
clearInterval(intervalId) | ||
}) | ||
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// We run the code once the breakpoint is set | ||
breakpointSetPromise.then(() => { | ||
sum(1, 2) | ||
}) | ||
}) |
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I need to be able to sync on these two to be able to know when to start a test (a test can't start before the breakpoint is set) and when a dynamic instrumentation log can be created (if a breakpoint is hit). Maybe I could use callbacks for the same? Open to ideas here