duanmeng9336 2015-10-26 16:59
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如何使用“内部”包?

I try understand how to organize go code using "internal" packages. Let me show what the structure I have:

project/
  internal/
    foo/
      foo.go # package foo
    bar/
      bar.go # package bar
  main.go

# here is the code from main.go
package main

import (
  "project/internal/foo"
  "project/internal/bar"
)

project/ is outside from GOPATH tree. Whatever path I try to import from main.go nothing works, the only case working fine is import "./internal/foo|bar". I think I do something wrong or get "internal" package idea wrong in general. Could anybody make things clearer, please?

UPDATE

The example above is correct the only what I need was to place project/ folder under $GOPATH/src. So the thing is import path like the project/internal/foo|bar is workable if we only import it from project/ subtree and not from the outside.

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  • douzhou7124 2015-10-26 17:11
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    The packages have to be located in your $GOPATH in order to be imported. The example you gave with import "./internal/foo|bar" works because it does a local-import. internal only makes it so code that doesn't share a common root directory to your internal directory can't import the packages within internal.

    If you put all this in your gopath then tried to import from a different location like OuterFolder/project2/main.go where OuterFolder contains both project and project2 then import "../../project/internal/foo" would fail. It would also fail as import "foo" or any other way your tried due to not satisfying this condition;

    An import of a path containing the element “internal” is disallowed if the importing code is outside the tree rooted at the parent of the “internal” directory.

    Now if you had the path $GOPATH/src/project then you could do import "foo" and import "bar" from within $GOPATH/src/project/main.go and the import would succeed. Things that are not contained underneath project however would not be able to import foo or bar.

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