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Merged
openshift-merge-robot merged 2 commits into from
Oct 19, 2018
Merged

daemon: Add ReadFile to FsClient #139

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40f2cf8
daemon: Add ReadFile to FsClient
ashcrow Oct 18, 2018
4b232a7
daemon: Update tests to check for 1 element, not 0
ashcrow Oct 19, 2018
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6 changes: 6 additions & 0 deletions pkg/daemon/fsclient.go
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Original file line number Diff line number Diff line change
Expand Up @@ -16,6 +16,7 @@ type FileSystemClient interface {
Chmod(string, os.FileMode) error
Chown(string, int, int) error
WriteFile(filename string, data []byte, perm os.FileMode) error
ReadFile(filename string) ([]byte, error)
}

// FsClient is used to hang the FileSystemClient functions on.
Expand Down Expand Up @@ -66,6 +67,11 @@ func (f FsClient) WriteFile(filename string, data []byte, perm os.FileMode) erro
return ioutil.WriteFile(filename, data, perm)
}

// ReadFile implements ioutil.WriteFile
func (f FsClient) ReadFile(filename string) ([]byte, error) {
return ioutil.ReadFile(filename)
}

// NewFileSystemClient creates a new file system client using the default
// implementations provided by the os package.
func NewFileSystemClient() FileSystemClient {
Expand Down
17 changes: 17 additions & 0 deletions pkg/daemon/fsclient_test.go
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Expand Up @@ -16,6 +16,13 @@ type StatReturn struct {
Error error
}

// ReadFileReturn is a structure used for testing. It holds a single return value
// set for a mocked ReadFile call.
type ReadFileReturn struct {
Bytes []byte
Error error
}

// FsClientMockMock is used as a mock of FsClientMock for testing.
type FsClientMock struct {
CreateReturns []CreateReturn
Expand All @@ -27,6 +34,7 @@ type FsClientMock struct {
ChmodReturns []error
ChownReturns []error
WriteFileReturns []error
ReadFileReturns []ReadFileReturn
}

// updateErrorReturns is a shortcut to pop out the error and shift
Expand Down Expand Up @@ -92,3 +100,12 @@ func (f FsClientMock) Chown(name string, uid, gid int) error {
func (f FsClientMock) WriteFile(filename string, data []byte, perm os.FileMode) error {
return updateErrorReturns(&f.WriteFileReturns)
}

// ReadFile provides a mocked implemention
func (f FsClientMock) ReadFile(filename string) ([]byte, error) {
returnValues := f.ReadFileReturns[0]

@jlebon jlebon Oct 19, 2018

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Shouldn't this be under the if statement to make sure the array is not empty first? E.g.

	if len(f....) > 0 {
		returnValues := f....[0]
		f.... = f.ReadFileReturns[1:]
		return returnValues
	}
	panic("no more values!")

?

I guess, as it is it'll panic anyway with index out of range, which I suppose was the intent since the unit test knows exactly how many times it should be called? But then it seems unnecessary to do the len check since if we got to there it means there definitely is at least one element. So an alternative is to just simplify it to:

	returnValues := f....[0]
	f.... = f.ReadFileReturns[1:]
	return returnValues

? (Though I still prefer the explicitness of the first alternative!)

@ashcrow ashcrow Oct 19, 2018

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The idea behind this is that:

  • If you provide nothing it panics
  • If you provide N returns and use N+X then X+1 will return the same last element (for example if I want everything to return no error I can just give it one nil, not 2, 5, 50, etc..)

@ashcrow ashcrow Oct 19, 2018

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I'm happy to do a follow on PR to make the panic explicit :-).

if len(f.ReadFileReturns) > 0 {
f.ReadFileReturns = f.ReadFileReturns[1:]
}
return returnValues.Bytes, returnValues.Error
}