Simple HTTP Endpoint Example

This example demonstrates how to setup a simple golang HTTP GET endpoint. When you fetch the endpoint we've set up here you'll see the time returned for the given request type.

Use Cases

  • Wrapping an existing internal or external endpoint/service

Development

The GCF golang runtime has a few requirements when defining your solution, namely:

  • Your function must be exported (e.g Hello)
  • You must define a non-main package, which can have an arbitrary name: package p
  • Your function code may not contain package main or a func main()

Since this is an alpha runtime provided by GCF the docs are not yet available for consumption. We'll update this README once those instructions are made public.

Deploy

In order to deploy the you endpoint simply run

serverless deploy -v

The expected result should be similar to:

Serverless: Uploading artifacts...
Serverless: Artifacts successfully uploaded...
Serverless: Updating deployment...
Serverless: Checking deployment update progress...
..............
Serverless: Done...
Service Information
service: golang-simple-http-endpoint
project: <project_name>
stage: dev
region: <region>
Deployed functions
currentTime
  https://<region>-<project_name>.cloudfunctions.net/endpoint

Usage

You can now invoke the Cloud Function directly and even see the resulting log via

serverless invoke --function hello

The expected result should be similar to:

Serverless: 6xthowrso4u2 {"message":"Go Serverless v1! Your function executed hello successfully!"}

And to check out the logs directly from sls, you can run the following:

serverless logs --function hello 
...
Serverless: Displaying the 10 most recent log(s):
2018-11-21T17:44:58.450200631Z: Function execution took 7 ms, finished with status code: 200
2018-11-21T17:44:58.443618562Z: Function execution started
2018-11-21T17:43:40.651063187Z: Function execution took 8 ms, finished with status code: 200
2018-11-21T17:43:40.644123421Z: Function execution started
2018-11-21T17:43:35.688702419Z: Function execution took 25 ms, finished with status code: 200
2018-11-21T17:43:35.664212161Z: Function execution started
2018-11-21T17:40:46.166468516Z: Function execution took 6 ms, finished with status code: 200
2018-11-21T17:40:46.161422666Z: Function execution started
2018-11-21T17:33:27.004019351Z: Function execution took 10 ms, finished with status code: 200
2018-11-21T17:33:26.994600775Z: Function execution started

Finally you can send an HTTP request directly to the endpoint using a tool like curl:

curl https://<region>-<project_name>.cloudfunctions.net/Hello

NOTE: notice that the request terminates with your golang exported function name, not the serverless function name you've defined.