Regarding "Accept interfaces, return concrete types", how can it be applied
for structs that represent a payload/value?
For example in package first, logger is defined as:
type logger interface {
Debugf(template string, args ...interface{})
Errorf(template string, args ...interface{})
Infof(template string, args ...interface{})
}
And package first only accepts a logger that implements the logger
interface.
Now lets assume there is a need for passing a struct too, like some config
or state.
This causes importing the original package that, that config or state
struct resides in; while package first is happily accepting other things
from that package using interfaces.
For example in package second there is some tool that is represented using
this interface in package first:
type cloner interface {
Clone() (*second.State, error)
}
As it can be seen, now package first has to explicitly import package
second, because of the type *second.State.
Currently I break things by renaming the second package to something
meaningless when importing like:
type cloner interface {
Clone() (*p2nd.State, error)
}
But this is not really a work around and package second leaks into the
scope of package first anyway.
Is there a way to actually achieve this?
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