mirror of https://github.com/databricks/cli.git
128 lines
3.0 KiB
Go
128 lines
3.0 KiB
Go
package deploy
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import (
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"bytes"
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"context"
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"encoding/json"
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"errors"
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"io"
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"io/fs"
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"os"
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"github.com/databricks/cli/bundle"
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"github.com/databricks/cli/bundle/deploy/files"
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"github.com/databricks/cli/libs/diag"
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"github.com/databricks/cli/libs/filer"
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"github.com/databricks/cli/libs/log"
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"github.com/databricks/cli/libs/sync"
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)
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type statePull struct {
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filerFactory FilerFactory
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}
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func (s *statePull) Apply(ctx context.Context, b *bundle.Bundle) diag.Diagnostics {
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f, err := s.filerFactory(b)
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if err != nil {
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return diag.FromErr(err)
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}
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// Download deployment state file from filer to local cache directory.
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log.Infof(ctx, "Opening remote deployment state file")
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remote, err := s.remoteState(ctx, f)
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if err != nil {
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log.Infof(ctx, "Unable to open remote deployment state file: %s", err)
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return diag.FromErr(err)
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}
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if remote == nil {
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log.Infof(ctx, "Remote deployment state file does not exist")
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return nil
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}
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statePath, err := getPathToStateFile(ctx, b)
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if err != nil {
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return diag.FromErr(err)
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}
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local, err := os.OpenFile(statePath, os.O_CREATE|os.O_RDWR, 0600)
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if err != nil {
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return diag.FromErr(err)
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}
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defer local.Close()
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data := remote.Bytes()
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err = validateRemoteStateCompatibility(bytes.NewReader(data))
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if err != nil {
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return diag.FromErr(err)
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}
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if !isLocalStateStale(local, bytes.NewReader(data)) {
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log.Infof(ctx, "Local deployment state is the same or newer, ignoring remote state")
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return nil
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}
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// Truncating the file before writing
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local.Truncate(0)
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local.Seek(0, 0)
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// Write file to disk.
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log.Infof(ctx, "Writing remote deployment state file to local cache directory")
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_, err = io.Copy(local, bytes.NewReader(data))
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if err != nil {
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return diag.FromErr(err)
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}
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var state DeploymentState
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err = json.Unmarshal(data, &state)
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if err != nil {
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return diag.FromErr(err)
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}
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// Create a new snapshot based on the deployment state file.
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opts, err := files.GetSyncOptions(ctx, bundle.ReadOnly(b))
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if err != nil {
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return diag.FromErr(err)
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}
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log.Infof(ctx, "Creating new snapshot")
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snapshot, err := sync.NewSnapshot(state.Files.ToSlice(b.SyncRoot), opts)
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if err != nil {
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return diag.FromErr(err)
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}
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// Persist the snapshot to disk.
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log.Infof(ctx, "Persisting snapshot to disk")
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return diag.FromErr(snapshot.Save(ctx))
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}
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func (s *statePull) remoteState(ctx context.Context, f filer.Filer) (*bytes.Buffer, error) {
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// Download deployment state file from filer to local cache directory.
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remote, err := f.Read(ctx, DeploymentStateFileName)
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if err != nil {
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// On first deploy this file doesn't yet exist.
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if errors.Is(err, fs.ErrNotExist) {
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return nil, nil
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}
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return nil, err
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}
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defer remote.Close()
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var buf bytes.Buffer
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_, err = io.Copy(&buf, remote)
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if err != nil {
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return nil, err
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}
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return &buf, nil
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}
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func (s *statePull) Name() string {
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return "deploy:state-pull"
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}
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// StatePull returns a mutator that pulls the deployment state from the Databricks workspace
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func StatePull() bundle.Mutator {
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return &statePull{StateFiler}
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}
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