DevTools: implement proxy server for hosted mode

third_party/WebKit/Source/devtools/hosted_mode/protocol_files_proxy.js

Index: third_party/WebKit/Source/devtools/hosted_mode/protocol_files_proxy.js
diff --git a/third_party/WebKit/Source/devtools/hosted_mode/protocol_files_proxy.js b/third_party/WebKit/Source/devtools/hosted_mode/protocol_files_proxy.js
new file mode 100644
index 0000000000000000000000000000000000000000..8cdd9f014b0f5e3a583881933fd7d94f0769a742
--- /dev/null
+++ b/third_party/WebKit/Source/devtools/hosted_mode/protocol_files_proxy.js
@@ -0,0 +1,65 @@
+var Cache = require("./cache");

[lushnikov, 2016/07/22 02:56:21]

let's add LICENSE

[chenwilliam, 2016/07/22 17:35:25]

OK. I'll add this snippet to the top of each of my file:

// Copyright (c) 2016 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

+var request = require("./request");
+
+var protocolFileCache = new Cache();
+var protocolFileToPath = {
+    "/front_end/sdk/protocol/js_protocol.json": "core/inspector/browser_protocol.json",
+    "/front_end/sdk/protocol/browser_protocol.json": "platform/v8_inspector/js_protocol.json"
+};
+var protocolFiles = Object.keys(protocolFileToPath);
+
+function getProtocolFile(protocolFile)
+{
+    return request("http://localhost:9222/json/version")
+        .then(response => JSON.parse(response))
+        .then(getVersion)

[lushnikov, 2016/07/22 02:56:21]

let's inline all this .then statements, as well as
getVersion/requestProtocolfile/anon function
into a single onBrowserMetadata function:


return request("http://localhost:9222/json/version")
    .then(onBrowserMetadata);

function onBrowserMetadata(metadata)
{
    var version = JSON.parse(matadata)["WebKit-Version"];
    var commitHash = version.match(/...../)[1];
      
    ...
}

[chenwilliam, 2016/07/22 17:35:25]

Done.

+        .then(version => {
+            protocolFileCache.setVersion(version);
+            if (protocolFileCache.hasFile(protocolFile)) {
+                return protocolFileCache.getFile(protocolFile);
+            }
+            return requestProtocolFile(protocolFile, version);
+        });
+}
+
+function getVersion(browserMetadata)
+{
+    var match = browserMetadata["WebKit-Version"].match(/\s\(@(\b[0-9a-f]{5,40}\b)/);
+    var commitHash = match[1];
+    return commitHash;
+}
+
+function requestProtocolFile(protocolFile, version)
+{
+    return request(getURL(protocolFile, version))
+        .then(text => convertBase64AsciiToBinary(text))
+        .then(data => {
+            protocolFileCache.cacheFile(protocolFile, data);
+            return data;
+        });
+}
+
+function getURL(protocolFile, commitHash)
+{
+    var path = protocolFileToPath[protocolFile];
+    return `https://chromium.googlesource.com/chromium/src/+/${commitHash}/third_party/WebKit/Source/${path}?format=TEXT`;
+}
+
+function convertBase64AsciiToBinary(string)

[lushnikov, 2016/07/22 02:56:21]

let's inline this

[chenwilliam, 2016/07/22 17:35:25]

Done.

+{
+  return new Buffer(string, "base64").toString("binary");
+}
+
+function loadCache()

[lushnikov, 2016/07/22 02:56:21]

let's remove this - it doesn't give much benefit

[chenwilliam, 2016/07/22 17:35:25]

Done.

+{
+    for (file of protocolFiles) {
+        getProtocolFile(file)
+            .catch(err => console.log("Make sure you have launched chrome with remote-debugging-port on 9222"));
+    }
+}
+
+module.exports = {
+    protocolFiles,

[lushnikov, 2016/07/22 02:56:21]

lets just export a single proxy function:

function proxy(filePath) : ?Promise<string>

proxy returns either promise (if the filePath was handled) or null.

[chenwilliam, 2016/07/22 17:35:25]

Done.

+    getProtocolFile,
+    loadCache
+};