根据条件选择包装

Question

We have 2 packages that implement the same function signatures. In my main I need to switch out the package being used based on a condition:

    import (
packageA "deployment/sdk/packageA"
packageB "deployment/sdk/packageB"
)

someCondition := true
var packageToUse ?

if someCondition {
    packageToUse = packageA
} else {
    packageToUse = packageB
}

packageToUse.DoSomething()

Of course, this doesn't compile. I don't know what type to use for packageToUse. This approach is probably an anti-pattern. I'm just not sure the approach I should be taking.

any suggestions?

The error I get is use of package without selector

Answer 1

This isn't quite what you asked, but this is how I would accomplish the goal if I were you:

// I assumed both package functions have the same signature, so you can use a type
// TODO: Actual function signature you want to use here
type myFn func() error

var fnToUse myFn
if someCondition {
    fnToUse = packageA.Func1
} else {
    fnToUse = packageB.Func2
}

fnToUse()