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Serverless + sls-http + koa example
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// written typescript | |
import { APIGatewayEvent, Context, Handler } from "aws-lambda"; | |
import Koa from "Koa"; | |
import Router from "koa-router"; | |
import serverlessHttp from "serverless-http"; | |
// for serverless offline | |
export interface SlsExtendableOfflineEvent extends APIGatewayEvent { | |
isOffline?: boolean; | |
} | |
const app = new Koa(); | |
const router = new Router({ prefix: "/prefix" }); | |
// set simple server middleware or use koa-logger | |
app.use(async (ctx, next) => { | |
try { | |
console.log(`(${ctx.method})[${ctx.url}] Requested`); | |
ctx.set("Access-Control-Allow-Credentials", "true"); | |
ctx.set( | |
"Access-Control-Allow-Origin", | |
"some cors access domain" | |
); | |
await next(); | |
} catch (err) { | |
ctx.status = err.status || 500; | |
ctx.body = | |
process.env === "development" ? err.message : "internal server error" | |
ctx.app.emit("error", err, ctx); | |
} | |
}); | |
app.on("error", (err, ctx) => { | |
console.error(`(${ctx.method})[${ctx.url}] Got An Error:`, err, ctx); | |
console.error(err.stack); | |
}); | |
router.get("/", async ctx => { | |
// Some business logic | |
ctx.status = 200; | |
ctx.body = "get success"; | |
}); | |
app.use(router.routes()); | |
const slsApp = serverlessHttp(app, { | |
request(req: Koa.SlsHttpIncomingMsg, event: SlsExtendableOfflineEvent) { | |
if (!event.isOffline) { | |
// remove CDN Prefix if exists, for sls-offline (ex. /route/prefix) | |
const cdnPrefix = req.url.split(this.prefix)[0]; | |
req.url = req.url.replace(cdnPrefix, ""); | |
} | |
// pass lambda's requestContext for auth, etc. | |
req.context = event.requestContext; | |
} | |
}); | |
export const handler: Handler = async ( | |
event: APIGatewayEvent, | |
context: Context | |
) => { | |
return slsApp(event, context); | |
}; |
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