Multiple applications built from one directory

Question

I have a simple Go project which is a web application, a worker application, and a shared file. These are in files web.go, worker.go, and shared.go (for example).

How can I "go install" to create the 2 binaries from this setup? If I just put all 3 files together, I get error main redeclared in this block because I have 2 main functions in the same package.

I really don't want to split these 3 files into 3 different directories with the 2 entry points in subdirectories created just to seperate them logically.

How can I keep them in the same directory and compile 2 executables?

Answer 1

The clean solution is to create three separate directories. One for the web program, one for the worker program and a shared package for both of them.

Alternatively, you can also use build constraints to control your build. GAE uses this approach for example, by providing an "appengine" build tag that can be used to provide a different main when using GAE. In this case, you would need to add an arbitrary build tag to the beginning of your files (eg // +build worker ) and invoke the go build tool accordingly, by including your build tags (something like go build -tags worker ) should probably work.