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backend/remote-state/gcloud: Refactor Backend.State(). 

Fixes:
* https://github.com/golang/go/wiki/CodeReviewComments#doc-comments
* https://github.com/golang/go/wiki/CodeReviewComments#error-strings
* https://github.com/golang/go/wiki/CodeReviewComments#initialisms
This commit is contained in:
Florian Forster 2017-09-08 10:36:28 +02:00 committed by James Bardin
parent 5cb574035a
commit 42e8441a2b
1 changed files with 42 additions and 45 deletions
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87
backend/remote-state/gcloud/backend_state.go
View File

@ -82,63 +82,60 @@ func (b *Backend) remoteClient(name string) (*RemoteClient, error) {
}, nil
}
// State reads and returns the named state from GCS. If the named state does
// not yet exist, a new state file is created.
func (b *Backend) State(name string) (state.State, error) {
client, err := b.remoteClient(name)
if err != nil {
return nil, fmt.Errorf("Failed to create Google Storage client: %v", err)
}
stateMgr := &remote.State{Client: client}
lockInfo := state.NewLockInfo()
lockInfo.Operation = "init"
lockId, err := stateMgr.Lock(lockInfo)
if err != nil {
return nil, fmt.Errorf("Failed to lock state in Google Cloud Storage: %v", err)
}
// Local helper function so we can call it multiple places
lockUnlock := func(parent error) error {
if err := stateMgr.Unlock(lockId); err != nil {
return fmt.Errorf(strings.TrimSpace(errStateUnlock), lockId, client.lockFileURL(), err)
}
return parent
}
// Grab the value
if err := stateMgr.RefreshState(); err != nil {
err = lockUnlock(err)
return nil, err
}
// If we have no state, we have to create an empty state
if v := stateMgr.State(); v == nil {
if err := stateMgr.WriteState(terraform.NewState()); err != nil {
err = lockUnlock(err)
return nil, err
st := &remote.State{Client: client}
lockInfo := state.NewLockInfo()
lockInfo.Operation = "init"
lockID, err := st.Lock(lockInfo)
if err != nil {
return nil, err
}
// Local helper function so we can call it multiple places
unlock := func(baseErr error) error {
if err := st.Unlock(lockID); err != nil {
const unlockErrMsg = `%v
Additionally, unlocking the state file on Google Cloud Storage failed:
Error message: %q
Lock ID (gen): %v
Lock file URL: %v
You may have to force-unlock this state in order to use it again.
The GCloud backend acquires a lock during initialization to ensure
the initial state file is created.`
return fmt.Errorf(unlockErrMsg, baseErr, err.Error(), lockID, client.lockFileURL())
}
if err := stateMgr.PersistState(); err != nil {
err = lockUnlock(err)
return nil, err
return baseErr
}
// Grab the value
if err := st.RefreshState(); err != nil {
return nil, unlock(err)
}
// If we have no state, we have to create an empty state
if v := st.State(); v == nil {
if err := st.WriteState(terraform.NewState()); err != nil {
return nil, unlock(err)
}
if err := st.PersistState(); err != nil {
return nil, unlock(err)
}
}
// Unlock, the state should now be initialized
if err := lockUnlock(nil); err != nil {
if err := unlock(nil); err != nil {
return nil, err
}
return stateMgr, nil
return st, nil
}
const errStateUnlock = `
Error unlocking Google Cloud Storage state.
Lock ID: %v
Lock file URL: %v
Error: %v
You may have to force-unlock this state in order to use it again.
The GCloud backend acquires a lock during initialization to ensure
the initial state file is created.
`