99 lines
2.4 KiB
Markdown
99 lines
2.4 KiB
Markdown
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---
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tags:
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- AWS
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- aws-lambda
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---
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# Handle multiple API Gateway endpoints in a single lambda
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With the following config we have a single lambda (`/query-waktime`) with
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multiple endpoints:
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```yml
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Resources:
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QueryWakatimeFunction:
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Type: AWS::Serverless::Function
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Properties:
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CodeUri: src/query-wakatime/
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Handler: index.handler
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Events:
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MainMetrics:
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Type: Api
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Properties:
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Path: /query-wakatime/main-metrics
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Method: get
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Auth:
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Authorizer: AWS_IAM
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Durations:
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Type: Api
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Properties:
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Path: /query-wakatime/durations
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Method: get
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Auth:
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Authorizer: AWS_IAM
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TodayOnly:
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Type: Api
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Properties:
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Path: /query-wakatime/today-only
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Method: get
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Auth:
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Authorizer: AWS_IAM
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```
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Our endpoints are as follows:
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- `/query-wakatime/main-metrics`
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- `/query-wakatime/durations`
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- `/query-wakatime/today-only`
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Each returns a different dataset from an external API. The lambda function makes
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a different request to the API based on the endpoint it receives and the time
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period that is passed as a query string parameter, e.g.
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`/query-wakatime?range=last_7_days`.
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Below is a template for concisely handling requests to the different endpoints
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in the single lambda function wihout excessive repetition.
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```js
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const getEndpoint = (path: string, timePeriod?: string | undefined) => {
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const basePath = "/users/current";
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switch (path) {
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case "/query-wakatime/main-metrics":
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return `${basePath}/stats/${timePeriod}`;
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case "/query-wakatime/durations":
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return `${basePath}/summaries?range=${timePeriod}`;
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case "/query-wakatime/today-only":
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return `${basePath}/status_bar/today`;
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}
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};
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export const handler = async (event) => {
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const fetchClient = new FetchClient("https://wakatime.com/api/v1/");
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const path = event.path;
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const timePeriod = event.queryStringParameters?.timePeriod;
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const endpoint = getEndpoint(path, timePeriod);
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const init: RequestInit = {
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headers: {
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Authorization: `Basic ${encodedApiKey}`,
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},
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};
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if (!endpoint) {
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throw new Error("Endpoint is undefined")
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}
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let data = await fetchClient.get(endpoint, init)
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let dataJson = (await data.json()) as string
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response = {
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statusCode: 200,
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body: JSON.stringify(dataJson),
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headers: responseHeaders,
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}
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};
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```
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