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backend_state.go
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backend_state.go
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package cloud
import (
"bytes"
"context"
"crypto/md5"
"encoding/base64"
"encoding/json"
"errors"
"fmt"
tfe "github.com/hashicorp/go-tfe"
"github.com/hashicorp/terraform/internal/command/jsonstate"
"github.com/hashicorp/terraform/internal/states/remote"
"github.com/hashicorp/terraform/internal/states/statefile"
"github.com/hashicorp/terraform/internal/states/statemgr"
)
type remoteClient struct {
client *tfe.Client
lockInfo *statemgr.LockInfo
organization string
runID string
stateUploadErr bool
workspace *tfe.Workspace
forcePush bool
}
// Get the remote state.
func (r *remoteClient) Get() (*remote.Payload, error) {
ctx := context.Background()
sv, err := r.client.StateVersions.ReadCurrent(ctx, r.workspace.ID)
if err != nil {
if err == tfe.ErrResourceNotFound {
// If no state exists, then return nil.
return nil, nil
}
return nil, fmt.Errorf("failed to retrieve state: %w", err)
}
state, err := r.client.StateVersions.Download(ctx, sv.DownloadURL)
if err != nil {
return nil, fmt.Errorf("failed to download state: %w", err)
}
// If the state is empty, then return nil.
if len(state) == 0 {
return nil, nil
}
// Get the MD5 checksum of the state.
sum := md5.Sum(state)
return &remote.Payload{
Data: state,
MD5: sum[:],
}, nil
}
// Put the remote state.
func (r *remoteClient) Put(state []byte) error {
ctx := context.Background()
// Read the raw state into a Terraform state.
stateFile, err := statefile.Read(bytes.NewReader(state))
if err != nil {
return fmt.Errorf("failed to read state: %w", err)
}
ov, err := jsonstate.MarshalOutputs(stateFile.State.RootModule().OutputValues)
if err != nil {
return fmt.Errorf("failed to translate outputs: %w", err)
}
o, err := json.Marshal(ov)
if err != nil {
return fmt.Errorf("failed to marshal outputs to json: %w", err)
}
options := tfe.StateVersionCreateOptions{
Lineage: tfe.String(stateFile.Lineage),
Serial: tfe.Int64(int64(stateFile.Serial)),
MD5: tfe.String(fmt.Sprintf("%x", md5.Sum(state))),
State: tfe.String(base64.StdEncoding.EncodeToString(state)),
Force: tfe.Bool(r.forcePush),
JSONStateOutputs: tfe.String(base64.StdEncoding.EncodeToString(o)),
}
// If we have a run ID, make sure to add it to the options
// so the state will be properly associated with the run.
if r.runID != "" {
options.Run = &tfe.Run{ID: r.runID}
}
// Create the new state.
_, err = r.client.StateVersions.Create(ctx, r.workspace.ID, options)
if err != nil {
r.stateUploadErr = true
return fmt.Errorf("failed to upload state: %w", err)
}
return nil
}
// Delete the remote state.
func (r *remoteClient) Delete() error {
err := r.client.Workspaces.Delete(context.Background(), r.organization, r.workspace.Name)
if err != nil && err != tfe.ErrResourceNotFound {
return fmt.Errorf("failed to delete workspace %s: %w", r.workspace.Name, err)
}
return nil
}
// EnableForcePush to allow the remote client to overwrite state
// by implementing remote.ClientForcePusher
func (r *remoteClient) EnableForcePush() {
r.forcePush = true
}
// Lock the remote state.
func (r *remoteClient) Lock(info *statemgr.LockInfo) (string, error) {
ctx := context.Background()
lockErr := &statemgr.LockError{Info: r.lockInfo}
// Lock the workspace.
_, err := r.client.Workspaces.Lock(ctx, r.workspace.ID, tfe.WorkspaceLockOptions{
Reason: tfe.String("Locked by Terraform"),
})
if err != nil {
if err == tfe.ErrWorkspaceLocked {
lockErr.Info = info
err = fmt.Errorf("%s (lock ID: \"%s/%s\")", err, r.organization, r.workspace.Name)
}
lockErr.Err = err
return "", lockErr
}
r.lockInfo = info
return r.lockInfo.ID, nil
}
// Unlock the remote state.
func (r *remoteClient) Unlock(id string) error {
ctx := context.Background()
// We first check if there was an error while uploading the latest
// state. If so, we will not unlock the workspace to prevent any
// changes from being applied until the correct state is uploaded.
if r.stateUploadErr {
return nil
}
lockErr := &statemgr.LockError{Info: r.lockInfo}
// With lock info this should be treated as a normal unlock.
if r.lockInfo != nil {
// Verify the expected lock ID.
if r.lockInfo.ID != id {
lockErr.Err = errors.New("lock ID does not match existing lock")
return lockErr
}
// Unlock the workspace.
_, err := r.client.Workspaces.Unlock(ctx, r.workspace.ID)
if err != nil {
lockErr.Err = err
return lockErr
}
return nil
}
// Verify the optional force-unlock lock ID.
if r.organization+"/"+r.workspace.Name != id {
lockErr.Err = fmt.Errorf(
"lock ID %q does not match existing lock ID \"%s/%s\"",
id,
r.organization,
r.workspace.Name,
)
return lockErr
}
// Force unlock the workspace.
_, err := r.client.Workspaces.ForceUnlock(ctx, r.workspace.ID)
if err != nil {
lockErr.Err = err
return lockErr
}
return nil
}