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Perf Extension
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <script src="devtools.js"></script> | |
| </head> | |
| </html> |
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| chrome.devtools.panels.create("My Panel", null, "panel.html", function (panel) { | |
| // | |
| }); |
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| { | |
| "action": {}, | |
| "devtools_page": "devtools.html", | |
| "key": "...", | |
| "manifest_version": 3, | |
| "name": "DevTools Perf!", | |
| "permissions": ["debugger"], | |
| "version": "1.0" | |
| } |
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| <html> | |
| <head> | |
| <style> | |
| :root[recording] .record-button { | |
| color: red; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <input class="record-button" type="button" /> | |
| <script src="utils.js"></script> | |
| <script src="panel.js"></script> | |
| </body> | |
| </html> |
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| const state = { | |
| isRecording: false, | |
| }; | |
| const recordButton = document.querySelector(".record-button"); | |
| recordButton.addEventListener("click", toggleRecording); | |
| function render() { | |
| if (state.isRecording) { | |
| document.documentElement.setAttribute("recording", "true"); | |
| recordButton.setAttribute("value", "Stop Recording"); | |
| } else { | |
| document.documentElement.removeAttribute("recording"); | |
| recordButton.setAttribute("value", "Start Recording"); | |
| } | |
| } | |
| async function toggleRecording() { | |
| if (!state.isRecording) { | |
| startRecording(); | |
| } else { | |
| stopRecording(); | |
| } | |
| } | |
| async function startRecording() { | |
| await sendCommand(getInspectedTab(), "DOM.disable"); | |
| await sendCommand(getInspectedTab(), "CSS.disable"); | |
| await sendCommand(getInspectedTab(), "Overlay.disable"); | |
| await sendCommand(getInspectedTab(), "Tracing.start", makeTracingParams()); | |
| state.isRecording = true; | |
| render(); | |
| } | |
| async function stopRecording() { | |
| await sendCommand(getInspectedTab(), "DOM.enable"); | |
| await sendCommand(getInspectedTab(), "CSS.enable"); | |
| await sendCommand(getInspectedTab(), "Overlay.enable"); | |
| await sendCommand(getInspectedTab(), "Tracing.end", makeTracingParams()); | |
| state.isRecording = false; | |
| render(); | |
| } | |
| attach(getInspectedTab(), "1.0").then(render); |
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| function promisify(f) { | |
| return (...args) => new Promise((resolve) => f(...args, resolve)); | |
| } | |
| const attach = promisify(chrome.debugger.attach); | |
| const sendCommand = promisify(chrome.debugger.sendCommand); | |
| function getInspectedTab() { | |
| return { tabId: chrome.devtools.inspectedWindow.tabId }; | |
| } | |
| function makeTracingParams() { | |
| return { | |
| bufferUsageReportingInterval: 500, | |
| categories: [ | |
| "-*", | |
| "devtools.timeline", | |
| "disabled-by-default-devtools.timeline", | |
| "disabled-by-default-devtools.timeline.frame", | |
| "v8.execute", | |
| "disabled-by-default-v8.compile", | |
| "blink.console", | |
| "blink.user_timing", | |
| "loading", | |
| "latencyInfo", | |
| "disabled-by-default-v8.cpu_profiler", | |
| "disabled-by-default-devtools.timeline.stack", | |
| "disabled-by-default-devtools.screenshot", | |
| ].join(","), | |
| options: "", | |
| transferMode: "ReportEvents", | |
| }; | |
| } |
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i tweaked the extension to show the trace data collected.
commit 8203a504e398a3b0efd8de198c95d467c3eb4060 Author: Paul Irish <commits@paul.irish> Date: 9 seconds ago print trace data diff --git a/panel.html b/panel.html index cf79e8e..6d823d1 100644 --- a/panel.html +++ b/panel.html @@ -10,5 +10,7 @@ <input class="record-button" type="button" /> <script src="utils.js"></script> <script src="panel.js"></script> + + <div id="trace"></div> </body> </html> diff --git a/panel.js b/panel.js index 0d0dc4c..ca49cbf 100644 --- a/panel.js +++ b/panel.js @@ -24,6 +24,8 @@ async function toggleRecording() { } async function startRecording() { + document.querySelector('#trace').textContent = ''; + await sendCommand(getInspectedTab(), "DOM.disable"); await sendCommand(getInspectedTab(), "CSS.disable"); await sendCommand(getInspectedTab(), "Overlay.disable"); @@ -41,4 +43,20 @@ async function stopRecording() { render(); } +onEvent((method, params) => { + if (!method.startsWith('Tracing.')) return; + printEventData(params); +}); + +function printEventData(data) { + // TODO: Filter down to trace event allowlist + + const h3 = document.createElement('h3'); + h3.textContent = method; + const pre = document.createElement('pre'); + pre.textContent = JSON.stringify(params, null, 2); + document.querySelector('#trace').append(h3, pre); +} + + attach(getInspectedTab(), "1.0").then(render); diff --git a/utils.js b/utils.js index 48b8cc4..58ff01e 100644 --- a/utils.js +++ b/utils.js @@ -5,10 +5,21 @@ function promisify(f) { const attach = promisify(chrome.debugger.attach); const sendCommand = promisify(chrome.debugger.sendCommand); + function getInspectedTab() { return { tabId: chrome.devtools.inspectedWindow.tabId }; } + +function onEvent(callback) { + const inspectedTab = getInspectedTab(); + chrome.debugger.onEvent.addListener((source, method, params) => { + if (source.tabId !== inspectedTab.tabId) return; + + callback(method, params); + }); +} + function makeTracingParams() { return { bufferUsageReportingInterval: 500,