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Alter build process to rely on canaries only 

With the react-sdk and js-sdk having their `npm start`s split out (as per https://github.com/matrix-org/matrix-react-sdk/pull/2175 and https://github.com/matrix-org/matrix-js-sdk/pull/742) we can trigger an initial build ourselves and start the watcher afterwards. This canary approach has a very slight speed increase over serially running all the commands as the watcher can be started as early as possible.

This all can be improved and potentially eliminated with a bit more planning, however: https://github.com/vector-im/riot-web/issues/7386
This commit is contained in:
Travis Ralston 2018-09-25 11:20:58 -06:00
parent 8d7cec2a94
commit 27c23058dc
4 changed files with 73 additions and 84 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

32
package-lock.json generated
View File

@ -384,12 +384,6 @@
"integrity": "sha1-GdOGodntxufByF04iu28xW0zYC0=",
"dev": true
},
"async-lock": {
"version": "1.1.3",
"resolved": "https://registry.npmjs.org/async-lock/-/async-lock-1.1.3.tgz",
"integrity": "sha512-nxlfFLGfCJ1r7p9zhR5OuL6jYkDd9P7FqSitfLji+C1NdyhCz4+rWW3kiPiyPASHhN7VlsKEvRWWbnME9lYngw==",
"dev": true
},
"asynckit": {
"version": "0.4.0",
"resolved": "https://registry.npmjs.org/asynckit/-/asynckit-0.4.0.tgz",
@ -4180,12 +4174,14 @@
"balanced-match": {
"version": "1.0.0",
"bundled": true,
"dev": true
"dev": true,
"optional": true
},
"brace-expansion": {
"version": "1.1.11",
"bundled": true,
"dev": true,
"optional": true,
"requires": {
"balanced-match": "^1.0.0",
"concat-map": "0.0.1"
@ -4200,17 +4196,20 @@
"code-point-at": {
"version": "1.1.0",
"bundled": true,
"dev": true
"dev": true,
"optional": true
},
"concat-map": {
"version": "0.0.1",
"bundled": true,
"dev": true
"dev": true,
"optional": true
},
"console-control-strings": {
"version": "1.1.0",
"bundled": true,
"dev": true
"dev": true,
"optional": true
},
"core-util-is": {
"version": "1.0.2",
@ -4327,7 +4326,8 @@
"inherits": {
"version": "2.0.3",
"bundled": true,
"dev": true
"dev": true,
"optional": true
},
"ini": {
"version": "1.3.5",
@ -4339,6 +4339,7 @@
"version": "1.0.0",
"bundled": true,
"dev": true,
"optional": true,
"requires": {
"number-is-nan": "^1.0.0"
}
@ -4353,6 +4354,7 @@
"version": "3.0.4",
"bundled": true,
"dev": true,
"optional": true,
"requires": {
"brace-expansion": "^1.1.7"
}
@ -4360,7 +4362,8 @@
"minimist": {
"version": "0.0.8",
"bundled": true,
"dev": true
"dev": true,
"optional": true
},
"minipass": {
"version": "2.2.4",
@ -4384,6 +4387,7 @@
"version": "0.5.1",
"bundled": true,
"dev": true,
"optional": true,
"requires": {
"minimist": "0.0.8"
}
@ -4464,7 +4468,8 @@
"number-is-nan": {
"version": "1.0.1",
"bundled": true,
"dev": true
"dev": true,
"optional": true
},
"object-assign": {
"version": "4.1.1",
@ -4597,6 +4602,7 @@
"version": "1.0.2",
"bundled": true,
"dev": true,
"optional": true,
"requires": {
"code-point-at": "^1.0.0",
"is-fullwidth-code-point": "^1.0.0",

1
package.json
View File

@ -81,7 +81,6 @@
"url": "^0.11.0"
},
"devDependencies": {
"async-lock": "^1.1.3",
"autoprefixer": "^6.6.0",
"babel-cli": "^6.5.2",
"babel-core": "^6.14.0",

57
scripts/block-on-sdk-build.js
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@ -1,19 +1,12 @@
const path = require('path');
const chokidar = require('chokidar');
const AsyncLock = require('async-lock');
// This script sits and waits for a build of an underlying SDK (js or react)
// to complete before exiting. This is done by cooperating with build-watch-sdk.js
// by waiting for it's signal to start watching for file changes, then watching
// the SDK's build output for a storm of file changes to stop. Both the js-sdk
// and react-sdk compile each file one by one, so by waiting for file changes to
// stop we know it is safe to continue and therefore exit this script. We give
// some leeway to the SDK's build process to handle larger/more complex files
// through use of a reset-on-touch countdown timer. When a file change occurs,
// we reset the countdown to WAIT_TIME and let it count down. If the count down
// completes, we consider ourselves having left the file system update storm and
// therefore can consider a build of the SDK to be fully completed.
// This script waits for a signal that an underlying SDK (js or react) has finished
// enough of the build process to be safe to rely on. In riot-web's case, this means
// that the underlying SDK has finished an initial build and is getting ready to watch
// for changes. This is done through use of a canary file that is deleted when it is
// safe to continue (see build-watch-sdk.js for why we listen for a delete event).
// Why do we block in the first place? Because if riot-web starts it's initial
// build (via webpack-dev-server) and the react-sdk or js-sdk are halfway through
@ -26,21 +19,12 @@ const AsyncLock = require('async-lock');
// build which riot-web is waiting for. When complete, riot-web starts building as
// per normal.
// Why the canary to begin watching? Because we can't reliably determine that the
// build triggered by `npm install` in each SDK is actually the process we need to
// be watching for. To work around this, build-watch-sdk.js does the `npm install`
// and follows through with a canary to signal to this script that it should start
// watching for changes produced by that SDK's `npm start` (run immediately after
// the canary is sent).
const WAIT_TIME = 5000; // ms
function waitForCanary(canaryName) {
return new Promise((resolve, reject) => {
const filename = path.resolve(path.join(".tmp", canaryName));
const filename = path.resolve(path.join(".tmp", canaryName + ".canary"));
// See triggerCanarySignal in build-watch-sdk.js for why we watch for `unlink`
// See build-watch-sdk.js for why we listen for 'unlink' specifically.
const watcher = chokidar.watch(filename).on('unlink', (path) => {
console.log("[block-on-build] Received signal to start watching for builds");
watcher.close();
@ -49,31 +33,6 @@ function waitForCanary(canaryName) {
});
}
function waitOnSdkBuild(sdkName) {
// First we wait for a local canary file to be changed
return waitForCanary(sdkName).then(() => new Promise((resolve, reject) => {
const buildDirectory = path.dirname(require.resolve(`matrix-${sdkName}-sdk`));
const lock = new AsyncLock();
let timerId = null;
const watcher = chokidar.watch(buildDirectory).on('all', (event, path) => {
lock.acquire("timer", (done) => {
if (timerId !== null) {
//console.log("Resetting countdown");
clearTimeout(timerId);
}
//console.log(`Waiting ${WAIT_TIME}ms for another file update...`);
timerId = setTimeout(() => {
console.log("[block-on-build] No updates - unblocking");
watcher.close();
resolve();
}, WAIT_TIME);
done();
}, null, null);
});
}));
}
const sdkName = process.argv[2];
if (!sdkName) {
console.error("[block-on-build] No SDK name provided");
@ -81,7 +40,7 @@ if (!sdkName) {
}
console.log("[block-on-build] Waiting for SDK: " + sdkName);
waitOnSdkBuild(sdkName).then(() => {
waitForCanary(sdkName).then(() => {
console.log("[block-on-build] Unblocked");
process.exit(0);
});

65
scripts/build-watch-sdk.js
View File

@ -16,7 +16,15 @@ if (!sdkName) {
}
const sdkPath = path.dirname(require.resolve(`matrix-${sdkName}-sdk/package.json`));
console.log(sdkPath);
// Note: we intentionally create then delete the canary file to work
// around a file watching problem where if the file exists on startup it
// may fire a "created" event for the file. By having the behaviour be "do
// something on delete" we avoid accidentally firing the signal too early.
// We also need to ensure the create and delete events are not too close
// together, otherwise the filesystem may not fire the watcher. Therefore
// we create the canary as early as possible and delete it as late as possible.
prepareCanarySignal(sdkName);
// We only want to build the SDK if it looks like it was `npm link`ed
if (fs.existsSync(path.join(sdkPath, '.git'))) {
@ -37,25 +45,37 @@ if (fs.existsSync(path.join(sdkPath, '.git'))) {
});
}
// Send a signal so that the various blocks can unblock. See the top of
// block-on-sdk-build.js for more information on how this is used.
console.log("Sending signal that other processes may unblock");
triggerCanarySignal(sdkName);
// Actually start the watcher process for the sdk. This is what block-on-sdk-build.js
// is going to monitor.
console.log("Performing task: " + task);
child_process.execSync(`npm ${task === "build" ? "run build" : "start"}`, {
// Prepare an initial build of the SDK
child_process.execSync("npm run start:init", {
env: process.env,
cwd: sdkPath,
});
}
// Send a signal to unblock the build for other processes. Used by block-on-sdk-build.js
console.log("Sending signal that other processes may unblock");
triggerCanarySignal(sdkName);
// Actually start the watcher process for the SDK (without an initial build)
console.log("Performing task: " + task);
const watchTask = sdkName === 'js' ? "start:watch" : "start:all";
const buildTask = "build";
child_process.execSync(`npm run ${task === "build" ? buildTask : watchTask}`, {
env: process.env,
cwd: sdkPath,
});
} else triggerCanarySignal(sdkName);
function triggerCanarySignal(sdkName) {
const tmpPath = path.resolve(".tmp");
fs.unlinkSync(getCanaryPath(sdkName));
}
function prepareCanarySignal(sdkName) {
const canaryPath = getCanaryPath(sdkName);
const canaryDir = path.dirname(canaryPath);
try {
fs.mkdirSync(tmpPath);
console.log("Creating canary temp path...");
fs.mkdirSync(canaryDir);
} catch (e) {
if (e.code !== 'EEXIST') {
console.error(e);
@ -63,12 +83,17 @@ function triggerCanarySignal(sdkName) {
}
}
// Note: we intentionally create then delete the file to work around
// a file watching problem where if the file exists on startup it may
// fire a "created" event for the file. By having the behaviour be "do
// something on delete" we avoid accidentally firing the signal too
// early.
const canaryPath = path.join(tmpPath, sdkName);
try {
console.log("Creating canary file: " + canaryPath);
fs.closeSync(fs.openSync(canaryPath, 'w'));
fs.unlinkSync(canaryPath);
} catch (e) {
if (e.code !== 'EEXIST') {
console.error(e);
throw "Failed to create canary file";
}
}
}
function getCanaryPath(sdkName) {
return path.join(path.resolve(".tmp"), sdkName + ".canary");
}