github.com/sathish1597/hashicorp-terraform@v0.11.12-beta1/backend/remote-state/manta/backend_state.go (about)

     1  package manta
     2  
     3  import (
     4  	"context"
     5  	"errors"
     6  	"fmt"
     7  	"path"
     8  	"sort"
     9  	"strings"
    10  
    11  	"github.com/hashicorp/terraform/backend"
    12  	"github.com/hashicorp/terraform/state"
    13  	"github.com/hashicorp/terraform/state/remote"
    14  	"github.com/hashicorp/terraform/terraform"
    15  	tritonErrors "github.com/joyent/triton-go/errors"
    16  	"github.com/joyent/triton-go/storage"
    17  )
    18  
    19  func (b *Backend) States() ([]string, error) {
    20  	result := []string{backend.DefaultStateName}
    21  
    22  	objs, err := b.storageClient.Dir().List(context.Background(), &storage.ListDirectoryInput{
    23  		DirectoryName: path.Join(mantaDefaultRootStore, b.path),
    24  	})
    25  	if err != nil {
    26  		if tritonErrors.IsResourceNotFound(err) {
    27  			return result, nil
    28  		}
    29  		return nil, err
    30  	}
    31  
    32  	for _, obj := range objs.Entries {
    33  		if obj.Type == "directory" && obj.Name != "" {
    34  			result = append(result, obj.Name)
    35  		}
    36  	}
    37  
    38  	sort.Strings(result[1:])
    39  	return result, nil
    40  }
    41  
    42  func (b *Backend) DeleteState(name string) error {
    43  	if name == backend.DefaultStateName || name == "" {
    44  		return fmt.Errorf("can't delete default state")
    45  	}
    46  
    47  	//firstly we need to delete the state file
    48  	err := b.storageClient.Objects().Delete(context.Background(), &storage.DeleteObjectInput{
    49  		ObjectPath: path.Join(mantaDefaultRootStore, b.statePath(name), b.objectName),
    50  	})
    51  	if err != nil {
    52  		return err
    53  	}
    54  
    55  	//then we need to delete the state folder
    56  	err = b.storageClient.Objects().Delete(context.Background(), &storage.DeleteObjectInput{
    57  		ObjectPath: path.Join(mantaDefaultRootStore, b.statePath(name)),
    58  	})
    59  	if err != nil {
    60  		return err
    61  	}
    62  
    63  	return nil
    64  }
    65  
    66  func (b *Backend) State(name string) (state.State, error) {
    67  	if name == "" {
    68  		return nil, errors.New("missing state name")
    69  	}
    70  
    71  	client := &RemoteClient{
    72  		storageClient: b.storageClient,
    73  		directoryName: b.statePath(name),
    74  		keyName:       b.objectName,
    75  	}
    76  
    77  	stateMgr := &remote.State{Client: client}
    78  
    79  	//if this isn't the default state name, we need to create the object so
    80  	//it's listed by States.
    81  	if name != backend.DefaultStateName {
    82  		// take a lock on this state while we write it
    83  		lockInfo := state.NewLockInfo()
    84  		lockInfo.Operation = "init"
    85  		lockId, err := client.Lock(lockInfo)
    86  		if err != nil {
    87  			return nil, fmt.Errorf("failed to lock manta state: %s", err)
    88  		}
    89  
    90  		// Local helper function so we can call it multiple places
    91  		lockUnlock := func(parent error) error {
    92  			if err := stateMgr.Unlock(lockId); err != nil {
    93  				return fmt.Errorf(strings.TrimSpace(errStateUnlock), lockId, err)
    94  			}
    95  			return parent
    96  		}
    97  
    98  		// Grab the value
    99  		if err := stateMgr.RefreshState(); err != nil {
   100  			err = lockUnlock(err)
   101  			return nil, err
   102  		}
   103  
   104  		// If we have no state, we have to create an empty state
   105  		if v := stateMgr.State(); v == nil {
   106  			if err := stateMgr.WriteState(terraform.NewState()); err != nil {
   107  				err = lockUnlock(err)
   108  				return nil, err
   109  			}
   110  			if err := stateMgr.PersistState(); err != nil {
   111  				err = lockUnlock(err)
   112  				return nil, err
   113  			}
   114  		}
   115  
   116  		// Unlock, the state should now be initialized
   117  		if err := lockUnlock(nil); err != nil {
   118  			return nil, err
   119  		}
   120  
   121  	}
   122  
   123  	return stateMgr, nil
   124  }
   125  
   126  func (b *Backend) client() *RemoteClient {
   127  	return &RemoteClient{}
   128  }
   129  
   130  func (b *Backend) statePath(name string) string {
   131  	if name == backend.DefaultStateName {
   132  		return b.path
   133  	}
   134  
   135  	return path.Join(b.path, name)
   136  }
   137  
   138  const errStateUnlock = `
   139  Error unlocking Manta state. Lock ID: %s
   140  
   141  Error: %s
   142  
   143  You may have to force-unlock this state in order to use it again.
   144  `