@scloud/lambda-local
Version:
Run typical Lambda handlers locally.
92 lines • 13.4 kB
JavaScript
;
var __importDefault = (this && this.__importDefault) || function (mod) {
return (mod && mod.__esModule) ? mod : { "default": mod };
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.webApiLocal = webApiLocal;
const express_1 = __importDefault(require("express"));
function webApiLocal(lambdaHandler, debug = false) {
const port = +(process.env.port || '3000');
const app = (0, express_1.default)();
// https://stackoverflow.com/questions/12345166/how-to-force-parse-request-body-as-plain-text-instead-of-json-in-express
app.use(express_1.default.text({ type: '*/*' }));
app.use(async (req, res) => {
// const url = new URL(req.originalUrl, 'https://example.com');
// Headers - NB it seems that in Lambda multiValueHeaders always contains the values from headers
const headers = {};
const multiValueHeaders = {};
Object.keys(req.headers).forEach((header) => {
if (req.headers[header] === undefined) {
headers[header] = undefined;
multiValueHeaders[header] = undefined;
}
else if (typeof req.headers[header] === 'string') {
headers[header] = req.headers[header];
multiValueHeaders[header] = (multiValueHeaders[header] || []).concat([req.headers[header]]);
}
else if (Array.isArray(req.headers[header])) {
multiValueHeaders[header] = (multiValueHeaders[header] || []).concat(req.headers[header]);
}
});
// Query string - basic translation
const queryStringParameters = {};
const multiValueQueryStringParameters = {};
for (const name of Object.keys(req.query)) {
const value = req.query[name];
if (typeof value === 'string')
queryStringParameters[name] = value;
}
const event = {
body: typeof req.body === 'string' ? req.body : JSON.stringify(req.body),
headers,
multiValueHeaders,
httpMethod: req.method,
path: req.path,
queryStringParameters,
multiValueQueryStringParameters,
requestContext: {
httpMethod: req.method,
path: req.path,
protocol: req.protocol,
},
};
// Print out the event that will be sent to the handler
if (debug) {
console.log('Event:');
console.log(event.httpMethod, event.path);
console.log(JSON.stringify(event, null, 2));
}
try {
// Invoke the function handler:
const result = await lambdaHandler(event, {});
// Print out the result
if (debug) {
console.log('Result:');
console.log(event.httpMethod, event.path, result.statusCode);
console.log(JSON.stringify(result.body, null, 2));
}
// Headers
res.status(result.statusCode);
for (const key of Object.keys(result.multiValueHeaders || [])) {
res.set(key, result.multiValueHeaders[key].map((value) => `${value}`));
}
;
for (const key of Object.keys(result.headers || [])) {
res.set(key, `${result.headers[key]}`);
}
;
// Body
res.send(result.body);
}
catch (e) {
// Log the error and send a 500 response
console.log(e);
console.log(e.stack);
res.status(500).send(`${e}`);
}
});
app.listen(port, () => {
console.log(`Lambda handler can be invoked at http://localhost:${port}`);
});
}
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NB it seems that in Lambda multiValueHeaders always contains the values from headers\n    const headers: Record<string, string | undefined> = {};\n    const multiValueHeaders: Record<string, string[] | undefined> = {};\n    Object.keys(req.headers).forEach((header) => {\n      if (req.headers[header] === undefined) {\n        headers[header] = undefined;\n        multiValueHeaders[header] = undefined;\n      } else if (typeof req.headers[header] === 'string') {\n        headers[header] = req.headers[header];\n        multiValueHeaders[header] = (multiValueHeaders[header] || []).concat([req.headers[header]]);\n      } else if (Array.isArray(req.headers[header])) {\n        multiValueHeaders[header] = (multiValueHeaders[header] || []).concat(req.headers[header]);\n      }\n    });\n\n    // Query string - basic translation\n    const queryStringParameters: Record<string, string | undefined> = {};\n    const multiValueQueryStringParameters: Record<string, string[] | undefined> = {};\n    for (const name of Object.keys(req.query)) {\n      const value = req.query[name];\n      if (typeof value === 'string') queryStringParameters[name] = value;\n    }\n\n    const event: APIGatewayProxyEvent = {\n      body: typeof req.body === 'string' ? req.body : JSON.stringify(req.body),\n      headers,\n      multiValueHeaders,\n      httpMethod: req.method,\n      path: req.path,\n      queryStringParameters,\n      multiValueQueryStringParameters,\n      requestContext: {\n        httpMethod: req.method,\n        path: req.path,\n        protocol: req.protocol,\n      } as unknown as APIGatewayProxyEvent['requestContext'],\n    } as unknown as APIGatewayProxyEvent;\n\n    // Print out the event that will be sent to the handler\n    if (debug) {\n      console.log('Event:');\n      console.log(event.httpMethod, event.path);\n      console.log(JSON.stringify(event, null, 2));\n    }\n\n    try {\n\n      // Invoke the function handler:\n      const result = await lambdaHandler(event, {} as Context);\n\n      // Print out the result\n      if (debug) {\n        console.log('Result:');\n        console.log(event.httpMethod, event.path, result.statusCode);\n        console.log(JSON.stringify(result.body, null, 2));\n      }\n\n      // Headers\n      res.status(result.statusCode);\n      for (const key of Object.keys(result.multiValueHeaders || [])) {\n        res.set(key, result.multiValueHeaders![key].map((value) => `${value}`));\n      };\n\n      for (const key of Object.keys(result.headers || [])) {\n        res.set(key, `${result.headers![key]}`);\n      };\n\n      // Body\n      res.send(result.body);\n\n    } catch (e) {\n      // Log the error and send a 500 response\n      console.log(e);\n      console.log((e as Error).stack);\n      res.status(500).send(`${e}`);\n    }\n  });\n\n  app.listen(port, () => {\n    console.log(`Lambda handler can be invoked at http://localhost:${port}`);\n  });\n}\n"]}