kobp
Version:
Koa Boilerplate with MikroORM
91 lines • 2.72 kB
JavaScript
import Koa from 'koa';
const _compileCustomization = (options) => {
const allOpts = options;
return {
onInit: async () => {
for (const opt of allOpts) {
if (opt.onInit) {
await opt.onInit();
}
}
},
onAppCreated: (app) => {
for (const opt of allOpts) {
if (opt.onAppCreated) {
opt.onAppCreated(app);
}
}
},
middlewares: (app) => {
for (const opt of allOpts) {
if (opt.middlewares) {
opt.middlewares(app);
}
}
},
onSignalReceived: async (signal, app) => {
for (const opt of allOpts) {
if (opt.onSignalReceived) {
await opt.onSignalReceived(signal, app);
}
}
}
};
};
export class BootstrapLoader {
constructor() {
this.modules = [];
}
addModule(module) {
this.modules.push(module);
return this;
}
buildSync(serviceRoutes, appCustomization) {
const opts = _compileCustomization([
...(this.modules.map((o) => o.customization())),
appCustomization,
]);
// Actual Bootstraping
const app = new Koa();
// Fork
let initPromise = opts.onInit();
app.use(async (context, next) => {
await initPromise;
await next();
});
this._launchKoa(serviceRoutes, app, opts);
return app;
}
async build(serviceRoutes, appCustomization) {
const opts = _compileCustomization([
...(this.modules.map((o) => o.customization())),
appCustomization,
]);
await opts.onInit();
// Actual Bootstraping
const app = new Koa();
this._launchKoa(serviceRoutes, app, opts);
return app;
}
_launchKoa(serviceRoutes, koa, opts) {
// Fork
opts.middlewares && opts.middlewares(koa);
// Register actual application
koa.use(serviceRoutes.routes());
koa.use(serviceRoutes.allowedMethods());
opts.onAppCreated && opts.onAppCreated(koa);
if (opts.onSignalReceived) {
// register onSignalReceived handler.
process.on('SIGTERM', (signal) => {
opts.onSignalReceived(signal, koa)
.then(() => {
process.exit(0);
})
.catch((e) => {
process.exit(1);
});
});
}
}
}
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