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backend_state.go
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backend_state.go
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package manta
import (
"context"
"errors"
"fmt"
"path"
"sort"
"strings"
tritonErrors "github.com/joyent/triton-go/errors"
"github.com/joyent/triton-go/storage"
"github.com/hashicorp/terraform/internal/backend"
"github.com/hashicorp/terraform/internal/states"
"github.com/hashicorp/terraform/internal/states/remote"
"github.com/hashicorp/terraform/internal/states/statemgr"
)
func (b *Backend) Workspaces() ([]string, error) {
result := []string{backend.DefaultStateName}
objs, err := b.storageClient.Dir().List(context.Background(), &storage.ListDirectoryInput{
DirectoryName: path.Join(mantaDefaultRootStore, b.path),
})
if err != nil {
if tritonErrors.IsResourceNotFound(err) {
return result, nil
}
return nil, err
}
for _, obj := range objs.Entries {
if obj.Type == "directory" && obj.Name != "" {
result = append(result, obj.Name)
}
}
sort.Strings(result[1:])
return result, nil
}
func (b *Backend) DeleteWorkspace(name string) error {
if name == backend.DefaultStateName || name == "" {
return fmt.Errorf("can't delete default state")
}
//firstly we need to delete the state file
err := b.storageClient.Objects().Delete(context.Background(), &storage.DeleteObjectInput{
ObjectPath: path.Join(mantaDefaultRootStore, b.statePath(name), b.objectName),
})
if err != nil {
return err
}
//then we need to delete the state folder
err = b.storageClient.Objects().Delete(context.Background(), &storage.DeleteObjectInput{
ObjectPath: path.Join(mantaDefaultRootStore, b.statePath(name)),
})
if err != nil {
return err
}
return nil
}
func (b *Backend) StateMgr(name string) (statemgr.Full, error) {
if name == "" {
return nil, errors.New("missing state name")
}
client := &RemoteClient{
storageClient: b.storageClient,
directoryName: b.statePath(name),
keyName: b.objectName,
}
stateMgr := &remote.State{Client: client}
//if this isn't the default state name, we need to create the object so
//it's listed by States.
if name != backend.DefaultStateName {
// take a lock on this state while we write it
lockInfo := statemgr.NewLockInfo()
lockInfo.Operation = "init"
lockId, err := client.Lock(lockInfo)
if err != nil {
return nil, fmt.Errorf("failed to lock manta state: %s", 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, 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(states.NewState()); err != nil {
err = lockUnlock(err)
return nil, err
}
if err := stateMgr.PersistState(); err != nil {
err = lockUnlock(err)
return nil, err
}
}
// Unlock, the state should now be initialized
if err := lockUnlock(nil); err != nil {
return nil, err
}
}
return stateMgr, nil
}
func (b *Backend) client() *RemoteClient {
return &RemoteClient{}
}
func (b *Backend) statePath(name string) string {
if name == backend.DefaultStateName {
return b.path
}
return path.Join(b.path, name)
}
const errStateUnlock = `
Error unlocking Manta state. Lock ID: %s
Error: %s
You may have to force-unlock this state in order to use it again.
`