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jhan.com.au
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added simple reloading development server

trunk
Kit Swinton 2023-10-20 12:46:50 +11:00
parent 9ba3032a92
commit 6219ff779c
6 changed files with 549 additions and 2 deletions
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4
.gitignore vendored
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@ -1,4 +1,6 @@
*.log
.cache
.DS_Store
build
*~
build
node_modules

11
README.md
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@ -5,4 +5,13 @@ Tenants of this design:
- Minimal build dependencies. Just combine, compress and go.
- K.I.S.S.
- Go slow and fix things.
- Mobile first and all that entails.
- Mobile first and all that entails.
## Build
```node build.js```
## Develop
```node dev-server.js```
or
```nodemon dev-server.js```
for live-reloading

35
client-websocket.js 100644
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/**
* @file site/client-websocket.js
*/
(()=>{
const socketUrl = 'ws://localhost:8090';
let socket = new WebSocket(socketUrl);
socket.addEventListener('close',()=>{
// Then the server has been turned off,
// either due to file-change-triggered reboot,
// or to truly being turned off.
// Attempt to re-establish a connection until it works,
// failing after a few seconds (at that point things are likely
// turned off/permanantly broken instead of rebooting)
const interAttemptTimeoutMilliseconds = 100;
const maxDisconnectedTimeMilliseconds = 3000;
const maxAttempts = Math.round(maxDisconnectedTimeMilliseconds/interAttemptTimeoutMilliseconds);
let attempts = 0;
const reloadIfCanConnect = ()=>{
attempts ++ ;
if(attempts > maxAttempts){
console.error("Could not reconnect to dev server.");
return;
}
socket = new WebSocket(socketUrl);
socket.addEventListener('error',()=>{
setTimeout(reloadIfCanConnect,interAttemptTimeoutMilliseconds);
});
socket.addEventListener('open',()=>{
location.reload();
});
};
reloadIfCanConnect();
});
})();

75
dev-server.js 100644
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const http = require('http');
const fs = require('fs');
const path = require('path');
const WebSocket = require('ws');
const buildScript = require('./build.js'); //run the build script before serving
const HTTP_PORT = 8089;
const WEBSOCKET_PORT = 8090;
const CLIENT_WEBSOCKET_CODE = fs.readFileSync(path.join(__dirname,'client-websocket.js'),'utf8');
console.log(`Starting dev server on port http://localhost:${HTTP_PORT}`);
// Websocket server (for allowing browser and dev server to have 2-way communication)
// We don't even need to do anything except create the instance!
const wss = new WebSocket.Server({
port: WEBSOCKET_PORT
});
/**
* @typedef {import('http').IncomingMessage} req
* @typedef {import('http').ServerResponse} res
*/
/** Use classic server-logic to serve a static file (e.g. default to 'index.html' etc)
* @param {string} route
* @param {res} res
* @returns {boolean} Whether or not the page exists and was served
*/
function serveStaticPageIfExists(route,res) {
// We don't care about performance for a dev server, so sync functions are fine.
// If the route exists it's either the exact file we want or the path to a directory
// in which case we'd serve up the 'index.html' file.
if(fs.existsSync(route)){
if(fs.statSync(route).isDirectory()){
return serveStaticPageIfExists(path.join(route,'index.html'),res);
}
else if(fs.statSync(route).isFile()){
res.writeHead(200);
/** @type {string|Buffer} */
let file = fs.readFileSync(route);
if(route.endsWith('.html')){
// Inject the client-side websocket code.
// This sounds fancier than it is; simply
// append the script to the end since
// browsers allow for tons of deviation
// from *technically correct* HTML.
file = `${file.toString()}\n\n<script>${CLIENT_WEBSOCKET_CODE}</script>`;
}
res.end(file);
return true;
}
}
return false;
}
/** General request handler and router
* @param {req} req
* @param {res} res
*/
const requestHandler = function (req, res) {
const method = req.method.toLowerCase();
if(method=='get'){
// No need to ensure the route can't access other local files,
// since this is for development only.
const route = path.normalize(path.join(__dirname,'build',req.url));
if(serveStaticPageIfExists(route,res)){
return;
}
}
res.writeHead(404);
res.end();
}
const server = http.createServer(requestHandler);
server.listen(HTTP_PORT);

414
package-lock.json generated 100644
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@ -0,0 +1,414 @@
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12
package.json 100644
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@ -0,0 +1,12 @@
{
"devDependencies": {
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},
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"watch": ["src/"],
"ext": "*.html, *.css",
"verbose": "true",
"delay": 2500
}
}