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feat: provide a lambda context with logging/error handling included
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,2 +1,4 @@ | ||
| export { Const } from './const'; | ||
| export { Aws } from './aws/index'; | ||
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| export { LambdaFunction } from './lambda'; |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,36 @@ | ||
| import { Logger } from './log'; | ||
| import { Context, Callback } from 'aws-lambda'; | ||
| import * as pino from 'pino'; | ||
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| export class LambdaFunction { | ||
| /** | ||
| * Wrap a lambda function to provide extra functionality | ||
| * | ||
| * - Log metadata about the call on every request | ||
| * - Catch errors and log them before exiting | ||
| */ | ||
| static wrap<T, K>(fn: (event: T, context: Context, logger: pino.Logger) => Promise<K>) { | ||
| return async (event: T, context: Context, callback: Callback<K>) => { | ||
| const startTime = Date.now(); | ||
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| const lambda = { | ||
| name: process.env['AWS_LAMBDA_FUNCTION_NAME'], | ||
| memory: process.env['AWS_LAMBDA_FUNCTION_MEMORY_SIZE'], | ||
| version: process.env['AWS_LAMBDA_FUNCTION_VERSION'], | ||
| region: process.env['AWS_REGION'], | ||
| }; | ||
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| const logger = Logger.child({}); | ||
| logger.info({ lambda }, 'LambdaStart'); | ||
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| try { | ||
| const res = await fn(event, context, logger); | ||
| logger.info({ lambda, duration: Date.now() - startTime, status: 200 }, 'LambdaDone'); | ||
| callback(null, res); | ||
| } catch (error) { | ||
| logger.info({ lambda, duration: Date.now() - startTime, status: 500, error: error }, 'LambdaError'); | ||
| callback(error); | ||
| } | ||
| }; | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,3 @@ | ||
| import * as pino from 'pino'; | ||
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| export const Logger = pino({ level: 'debug' }); |
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