⚡️Serverless Framework Go Plugin


serverless-golang-plugin is a Serverless Framework plugin that compiles Go functions on the fly. You don't need to do it manually before serverless deploy. Once the plugin is installed it will happen automatically. _The plugin works with Serverless Framework version 1.52 and above._

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Features

- Concurrent compilation happens across all CPU cores.
- Support for both serverless deploy and serverless deploy function commands.
- Support for serverless invoke local command.
- Additional command serverless go build.

Install

1. Install the plugin

``
npm i --save-dev serverless-golang-plugin
`

1. Add it to your serverless.yaml

`
plugins:
- serverless-golang-plugin
`

1. Replace every Go function's handler with *.go file path or a package path. E.g.

`
functions:
example:
runtime: go1.x
handler: functions/example/main.go # or just functions/example
`

Configuration

Default values:

`
custom:
go:
baseDir: . # folder where go.mod file lives, if set handler property should be set relatively to that folder
binDir: .bin # target folder for binary files
cgo: 0 # CGO_ENABLED flag
cmd: GOOS=linux go build -ldflags="-s -w"' # compile command
monorepo: false # if enabled, builds function every directory (useful for monorepo where go.mod is managed by each function
supportedRuntimes: ["go1.x"] # the plugin compiles a function only if runtime is declared here (either on function or provider level)
buildProvidedRuntimeAsBootstrap: false # if enabled, builds and archive function with only single "bootstrap" binary (useful for runtimes like provided.al2)
`

How does it work?

The plugin compiles every Go function defined in serverless.yaml into .bin directory. After that it internally changes handler so that the Serverless Framework will deploy the compiled file not the source file.

For every matched function it also overrides package parameter to

`
individually: true
exclude:
- ./**
include:
-
`

How to run Golang Lambda on ARM?

1. Add provided.al2 to supportedRuntimes and enable buildProvidedRuntimeAsBootstrap in plugin config
2. Append GOARCH=arm64 to your compile command (cmd line)
3. Change architecture and runtime in global config:

`yaml
provider:
architecture: arm64
runtime: provided.al2
``

Warning! First deploy may result in small downtime (~few seconds) of lambda, use some deployment strategy like canary for safer rollout.