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lambda-server.js
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lambda-server.js
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import pureHttp from "pure-http";
import fs from "fs";
const PORT = 3000;
const BASE_PATH = "/2018-06-01/runtime";
const ARGS = process.argv.slice(2);
let httpMode = false;
let eventJson = null;
let argIndex = 0;
for (let arg of ARGS) {
if (arg == "-h" || arg == "--http") {
httpMode = true;
}
if (arg == "-e" || arg == "--event") {
eventJson = JSON.parse(fs.readFileSync(ARGS[argIndex + 1]).toString());
}
argIndex++;
}
const app = pureHttp();
const pendingRequests = [];
const requests = {};
let invocationWaiter = null;
app.use(async (req, res, next) => {
const body = await new Promise((resolve, reject) => {
let buffer = "";
req
.on("data", (chunk) => {
buffer += chunk;
})
.on("end", () => {
resolve(buffer);
})
.on("error", reject);
});
if (body) {
req.body = body || undefined;
}
return next();
});
app.use((req, res, next) => {
const date = new Date();
const hours = date.getHours();
const minutes = date.getMinutes();
const seconds = date.getSeconds();
const milliseconds = date.getMilliseconds();
console.log(
`${hours}:${minutes}:${seconds}:${milliseconds} - ${req.method}: ${req.path}`
);
try {
return next();
} catch (error) {
res.json({ error });
}
});
app.use((req, res, next) => {
res.setHeader("Access-Control-Allow-Origin", "*");
res.setHeader("Access-Control-Allow-Headers", "*");
res.setHeader("Access-Control-Allow-Methods", "*");
if (req.method === "OPTIONS") {
return res.send("");
}
next();
});
app.get(`${BASE_PATH}/invocation/next`, async (req, res) => {
res.header("lambda-runtime-deadline-ms", Date.now() + 1000 * 60);
if (httpMode) {
if (pendingRequests.length == 0) {
await new Promise((resolve) => {
invocationWaiter = resolve;
});
}
let { id, event } = pendingRequests.shift();
res.header("lambda-runtime-aws-request-id", id);
res.json(event);
} else {
res.header("lambda-runtime-aws-request-id", "1234");
res.json(
eventJson || {
key1: "value1",
key2: "value2",
key3: "value3",
}
);
}
});
app.post(`${BASE_PATH}/init/error`, (req, res) => {
if (httpMode) {
for (const request of pendingRequests) {
request.reject({
statusCode: 500,
body: req.body,
headers: { "content-type": "application/json" },
});
}
}
res.status(202);
res.send();
});
app.post(`${BASE_PATH}/invocation/:id/response`, (req, res) => {
if (httpMode) {
const { id } = req.params;
const { resolve } = requests[id];
delete requests[id];
resolve(req.body);
} else {
console.log(req.body);
}
res.status(202);
res.send();
});
app.post(`${BASE_PATH}/invocation/:id/error`, (req, res) => {
if (httpMode) {
const { id } = req.params;
const { reject } = requests[id];
delete requests[id];
reject({
body: req.body,
statusCode: 500,
headers: { "content-type": "application/json" },
});
} else {
console.error(req.body);
}
res.status(202);
res.send();
});
app.all("*", async (req, res) => {
if (!httpMode) {
res.status(400);
res.send("Server is not in HTTP mode. Start with -h flag");
return;
}
const requestUrl = new URL(`https://localhost:0000${req.url}`);
const rawQueryString = requestUrl.search?.substring(1);
const requestId = Math.random().toString(36).substring(2);
const queryStringParameters = Object.fromEntries(
requestUrl.searchParams.entries()
);
const event = {
version: "2.0",
routeKey: "$default",
rawPath: "/my/path",
rawQueryString,
cookies: undefined,
headers: Object.entries(req.headers).reduce((acc, [key, value]) => {
acc[key] = (value && Array.isArray(value) && value.join(",")) || value;
return acc;
}, {}),
queryStringParameters,
requestContext: {
accountId: "123456789012",
apiId: "localhost",
domainName: "localhost",
domainPrefix: "localhost",
http: {
method: req.method,
path: req.path,
protocol: req.protocol,
sourceIp: "192.168.1.1",
userAgent: req.header["User-Agent"],
},
requestId,
routeKey: "$default",
stage: "$default",
time: new Date().toString(),
timeEpoch: new Date().getTime(),
},
body: req.body,
pathParameters: req.params,
isBase64Encoded: false,
};
const responsePromise = new Promise((resolve, reject) => {
const id = requestId;
const request = {
event,
resolve,
reject,
id,
};
pendingRequests.push(request);
requests[id] = request;
});
if (invocationWaiter) {
invocationWaiter();
}
let result;
try {
result = await responsePromise;
} catch (e) {
result = e;
}
try {
result = JSON.parse(result);
} catch (_) {}
if (result.body && result.statusCode) {
if (result.headers) {
for (const key in result.headers) {
res.setHeader(key, result.headers[key]);
}
}
res.status(result.statusCode);
if (result.isBase64Encoded) {
res.send(Buffer.from(result.body, "base64"));
} else {
res.send(result.body);
}
return;
}
res.send(result);
});
app.listen(PORT, () => {
console.log(`Server started on port ${PORT}`);
if (httpMode) {
console.log(`- HTTP: https://localhost:${PORT}`);
}
});