Golang state.CacheState類代碼示例

func (c *RemotePullCommand) Run(args []string) int {
	args = c.Meta.process(args, false)
	cmdFlags := flag.NewFlagSet("pull", flag.ContinueOnError)
	cmdFlags.Usage = func() { c.Ui.Error(c.Help()) }
	if err := cmdFlags.Parse(args); err != nil {
		return 1
	}

	// Read out our state
	s, err := c.State()
	if err != nil {
		c.Ui.Error(fmt.Sprintf("Failed to read state: %s", err))
		return 1
	}
	localState := s.State()

	// If remote state isn't enabled, it is a problem.
	if !localState.IsRemote() {
		c.Ui.Error("Remote state not enabled!")
		return 1
	}

	// We need the CacheState structure in order to do anything
	var cache *state.CacheState
	if bs, ok := s.(*state.BackupState); ok {
		if cs, ok := bs.Real.(*state.CacheState); ok {
			cache = cs
		}
	}
	if cache == nil {
		c.Ui.Error(fmt.Sprintf(
			"Failed to extract internal CacheState from remote state.\n" +
				"This is an internal error, please report it as a bug."))
		return 1
	}

	// Refresh the state
	if err := cache.RefreshState(); err != nil {
		c.Ui.Error(fmt.Sprintf(
			"Failed to refresh from remote state: %s", err))
		return 1
	}

	// Use an error exit code if the update was not a success
	change := cache.RefreshResult()
	if !change.SuccessfulPull() {
		c.Ui.Error(fmt.Sprintf("%s", change))
		return 1
	} else {
		c.Ui.Output(c.Colorize().Color(fmt.Sprintf(
			"[reset][bold][green]%s", change)))
	}

	return 0
}

// State returns the proper state.State implementation to represent the
// current environment.
//
// localPath is the path to where state would be if stored locally.
// dataDir is the path to the local data directory where the remote state
// cache would be stored.
func State(opts *StateOpts) (*StateResult, error) {
	result := new(StateResult)

	// Get the remote state cache path
	if opts.RemotePath != "" {
		result.RemotePath = opts.RemotePath

		var remote *state.CacheState
		if opts.RemoteCacheOnly {
			// Setup the in-memory state
			ls := &state.LocalState{Path: opts.RemotePath}
			if err := ls.RefreshState(); err != nil {
				return nil, err
			}

			// If we have a forced state, set it
			if opts.ForceState != nil {
				ls.SetState(opts.ForceState)
			}

			is := &state.InmemState{}
			is.WriteState(ls.State())

			// Setupt he remote state, cache-only, and refresh it so that
			// we have access to the state right away.
			remote = &state.CacheState{
				Cache:   ls,
				Durable: is,
			}
			if err := remote.RefreshState(); err != nil {
				return nil, err
			}
		} else {
			// If we have a forced state that is remote, then we load that
			if opts.ForceState != nil &&
				opts.ForceState.Remote != nil &&
				opts.ForceState.Remote.Type != "" {
				var err error
				remote, err = remoteState(
					opts.ForceState,
					opts.RemotePath,
					false)
				if err != nil {
					return nil, err
				}
			} else {
				// Only if we have no forced state, we check our normal
				// remote path.
				if _, err := os.Stat(opts.RemotePath); err == nil {
					// We have a remote state, initialize that.
					remote, err = remoteStateFromPath(
						opts.RemotePath,
						opts.RemoteRefresh)
					if err != nil {
						return nil, err
					}
				}
			}
		}

		if remote != nil {
			result.State = remote
			result.StatePath = opts.RemotePath
			result.Remote = remote
		}
	}

	// If we have a forced state and we were able to initialize that
	// into a remote state, we don't do any local state stuff. This is
	// because normally we're able to test whether we should do local vs.
	// remote by checking file existence. With ForceState, file existence
	// doesn't work because neither may exist, so we use state attributes.
	if opts.ForceState != nil && result.Remote != nil {
		opts.LocalPath = ""
	}

	// Do we have a local state?
	if opts.LocalPath != "" {
		local := &state.LocalState{
			Path:    opts.LocalPath,
			PathOut: opts.LocalPathOut,
		}

		// Always store it in the result even if we're not using it
		result.Local = local
		result.LocalPath = local.Path
		if local.PathOut != "" {
			result.LocalPath = local.PathOut
		}

		// If we're forcing, then set it
		if opts.ForceState != nil {
			local.SetState(opts.ForceState)
		} else {
//.........這裏部分代碼省略.........

// State returns the proper state.State implementation to represent the
// current environment.
//
// localPath is the path to where state would be if stored locally.
// dataDir is the path to the local data directory where the remote state
// cache would be stored.
func State(opts *StateOpts) (*StateResult, error) {
	result := new(StateResult)

	// Get the remote state cache path
	if opts.RemotePath != "" {
		result.RemotePath = opts.RemotePath

		var remote *state.CacheState
		if opts.RemoteCacheOnly {
			// Setup the in-memory state
			ls := &state.LocalState{Path: opts.RemotePath}
			if err := ls.RefreshState(); err != nil {
				return nil, err
			}
			is := &state.InmemState{}
			is.WriteState(ls.State())

			// Setupt he remote state, cache-only, and refresh it so that
			// we have access to the state right away.
			remote = &state.CacheState{
				Cache:   ls,
				Durable: is,
			}
			if err := remote.RefreshState(); err != nil {
				return nil, err
			}
		} else {
			if _, err := os.Stat(opts.RemotePath); err == nil {
				// We have a remote state, initialize that.
				remote, err = remoteStateFromPath(
					opts.RemotePath,
					opts.RemoteRefresh)
				if err != nil {
					return nil, err
				}
			}
		}

		if remote != nil {
			result.State = remote
			result.StatePath = opts.RemotePath
			result.Remote = remote
		}
	}

	// Do we have a local state?
	if opts.LocalPath != "" {
		local := &state.LocalState{
			Path:    opts.LocalPath,
			PathOut: opts.LocalPathOut,
		}

		// Always store it in the result even if we're not using it
		result.Local = local
		result.LocalPath = local.Path
		if local.PathOut != "" {
			result.LocalPath = local.PathOut
		}

		err := local.RefreshState()
		if err == nil {
			if result.State != nil && !result.State.State().Empty() {
				if !local.State().Empty() {
					// We already have a remote state... that is an error.
					return nil, fmt.Errorf(
						"Remote state found, but state file '%s' also present.",
						opts.LocalPath)
				}

				// Empty state
				local = nil
			}
		}
		if err != nil {
			return nil, errwrap.Wrapf(
				"Error reading local state: {{err}}", err)
		}

		if local != nil {
			result.State = local
			result.StatePath = opts.LocalPath
			if opts.LocalPathOut != "" {
				result.StatePath = opts.LocalPathOut
			}
		}
	}

	// If we have a result, make sure to back it up
	if result.State != nil {
		backupPath := result.StatePath + DefaultBackupExtention
		if opts.BackupPath != "" {
			backupPath = opts.BackupPath
		}

//.........這裏部分代碼省略.........