feat(federation): implement bd federation sync command
Add peer-to-peer synchronization for Dolt-backed beads databases: - New FederatedStorage interface with PushTo, PullFrom, Fetch, ListRemotes, RemoveRemote, and SyncStatus methods - DoltStore implementation using DOLT_PUSH, DOLT_PULL, DOLT_FETCH - Full bd federation command with subcommands: - sync: bidirectional sync with conflict resolution (--strategy ours|theirs) - status: show ahead/behind counts and conflict state - add-peer/remove-peer/list-peers: manage federation remotes - Comprehensive tests for all federation APIs Closes: bd-wkumz.4 Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
This commit is contained in:
beads/crew/emma
committed by
Steve Yegge
Steve Yegge
parent
cf6356b98a
commit
6190dd9362
204
internal/storage/dolt/federation.go
Normal file
204
internal/storage/dolt/federation.go
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@@ -0,0 +1,204 @@
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package dolt
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import (
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"context"
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"fmt"
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"time"
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"github.com/steveyegge/beads/internal/storage"
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)
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// FederatedStorage implementation for DoltStore
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// These methods enable peer-to-peer synchronization between Gas Towns.
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// PushTo pushes commits to a specific peer remote.
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func (s *DoltStore) PushTo(ctx context.Context, peer string) error {
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// DOLT_PUSH(remote, branch)
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_, err := s.db.ExecContext(ctx, "CALL DOLT_PUSH(?, ?)", peer, s.branch)
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if err != nil {
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return fmt.Errorf("failed to push to peer %s: %w", peer, err)
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}
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return nil
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}
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// PullFrom pulls changes from a specific peer remote.
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// Returns any merge conflicts if present.
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func (s *DoltStore) PullFrom(ctx context.Context, peer string) ([]storage.Conflict, error) {
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// DOLT_PULL(remote) - pulls and merges
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_, err := s.db.ExecContext(ctx, "CALL DOLT_PULL(?)", peer)
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if err != nil {
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// Check if the error is due to merge conflicts
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conflicts, conflictErr := s.GetConflicts(ctx)
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if conflictErr == nil && len(conflicts) > 0 {
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return conflicts, nil
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}
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return nil, fmt.Errorf("failed to pull from peer %s: %w", peer, err)
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}
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return nil, nil
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}
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// Fetch fetches refs from a peer without merging.
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func (s *DoltStore) Fetch(ctx context.Context, peer string) error {
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// DOLT_FETCH(remote)
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_, err := s.db.ExecContext(ctx, "CALL DOLT_FETCH(?)", peer)
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if err != nil {
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return fmt.Errorf("failed to fetch from peer %s: %w", peer, err)
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}
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return nil
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}
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// ListRemotes returns configured remote names and URLs.
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func (s *DoltStore) ListRemotes(ctx context.Context) ([]storage.RemoteInfo, error) {
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rows, err := s.db.QueryContext(ctx, "SELECT name, url FROM dolt_remotes")
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if err != nil {
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return nil, fmt.Errorf("failed to list remotes: %w", err)
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}
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defer rows.Close()
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var remotes []storage.RemoteInfo
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for rows.Next() {
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var r storage.RemoteInfo
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if err := rows.Scan(&r.Name, &r.URL); err != nil {
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return nil, fmt.Errorf("failed to scan remote: %w", err)
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}
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remotes = append(remotes, r)
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}
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return remotes, rows.Err()
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}
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// RemoveRemote removes a configured remote.
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func (s *DoltStore) RemoveRemote(ctx context.Context, name string) error {
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_, err := s.db.ExecContext(ctx, "CALL DOLT_REMOTE('remove', ?)", name)
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if err != nil {
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return fmt.Errorf("failed to remove remote %s: %w", name, err)
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}
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return nil
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}
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// SyncStatus returns the sync status with a peer.
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func (s *DoltStore) SyncStatus(ctx context.Context, peer string) (*storage.SyncStatus, error) {
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status := &storage.SyncStatus{
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Peer: peer,
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}
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// Get ahead/behind counts by comparing refs
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// This requires the peer to have been fetched first
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query := `
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SELECT
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(SELECT COUNT(*) FROM dolt_log WHERE commit_hash NOT IN
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(SELECT commit_hash FROM dolt_log AS OF CONCAT(?, '/', ?))) as ahead,
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(SELECT COUNT(*) FROM dolt_log AS OF CONCAT(?, '/', ?) WHERE commit_hash NOT IN
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(SELECT commit_hash FROM dolt_log)) as behind
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`
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err := s.db.QueryRowContext(ctx, query, peer, s.branch, peer, s.branch).
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Scan(&status.LocalAhead, &status.LocalBehind)
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if err != nil {
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// If we can't get the status, return a partial result
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// This happens when the remote branch doesn't exist locally yet
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status.LocalAhead = -1
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status.LocalBehind = -1
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}
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// Check for conflicts
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conflicts, err := s.GetConflicts(ctx)
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if err == nil && len(conflicts) > 0 {
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status.HasConflicts = true
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}
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// TODO: Track last sync time in metadata
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status.LastSync = time.Time{} // Zero time indicates never synced
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return status, nil
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}
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// Sync performs a full bidirectional sync with a peer:
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// 1. Fetch from peer
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// 2. Merge peer's changes (handling conflicts per strategy)
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// 3. Push local changes to peer
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//
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// Returns the sync result including any conflicts encountered.
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func (s *DoltStore) Sync(ctx context.Context, peer string, strategy string) (*SyncResult, error) {
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result := &SyncResult{
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Peer: peer,
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StartTime: time.Now(),
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}
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// Step 1: Fetch from peer
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if err := s.Fetch(ctx, peer); err != nil {
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result.Error = fmt.Errorf("fetch failed: %w", err)
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return result, result.Error
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}
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result.Fetched = true
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// Step 2: Get status before merge
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beforeCommit, _ := s.GetCurrentCommit(ctx)
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// Step 3: Merge peer's branch
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remoteBranch := fmt.Sprintf("%s/%s", peer, s.branch)
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conflicts, err := s.Merge(ctx, remoteBranch)
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if err != nil {
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result.Error = fmt.Errorf("merge failed: %w", err)
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return result, result.Error
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}
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// Step 4: Handle conflicts if any
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if len(conflicts) > 0 {
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result.Conflicts = conflicts
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if strategy == "" {
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// No strategy specified, leave conflicts for manual resolution
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result.Error = fmt.Errorf("merge conflicts require resolution (use --strategy ours|theirs)")
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return result, result.Error
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}
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// Auto-resolve using strategy
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for _, c := range conflicts {
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if err := s.ResolveConflicts(ctx, c.Field, strategy); err != nil {
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result.Error = fmt.Errorf("conflict resolution failed for %s: %w", c.Field, err)
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return result, result.Error
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}
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}
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result.ConflictsResolved = true
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// Commit the resolution
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if err := s.Commit(ctx, fmt.Sprintf("Resolve conflicts from %s using %s strategy", peer, strategy)); err != nil {
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result.Error = fmt.Errorf("failed to commit conflict resolution: %w", err)
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return result, result.Error
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}
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}
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result.Merged = true
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// Count pulled commits
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afterCommit, _ := s.GetCurrentCommit(ctx)
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if beforeCommit != afterCommit {
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result.PulledCommits = 1 // Simplified - could count actual commits
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}
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// Step 5: Push our changes to peer
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if err := s.PushTo(ctx, peer); err != nil {
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// Push failure is not fatal - peer may not accept pushes
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result.PushError = err
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} else {
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result.Pushed = true
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}
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result.EndTime = time.Now()
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return result, nil
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}
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// SyncResult contains the outcome of a Sync operation.
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type SyncResult struct {
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Peer string
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StartTime time.Time
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EndTime time.Time
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Fetched bool
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Merged bool
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Pushed bool
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PulledCommits int
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PushedCommits int
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Conflicts []storage.Conflict
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ConflictsResolved bool
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Error error
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PushError error // Non-fatal push error
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}
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@@ -322,6 +322,103 @@ func TestFederationHistoryQueries(t *testing.T) {
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}
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}
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// TestFederationListRemotes tests the ListRemotes API
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func TestFederationListRemotes(t *testing.T) {
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skipIfNoDolt(t)
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ctx, cancel := context.WithTimeout(context.Background(), time.Minute)
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defer cancel()
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store, cleanup := setupTestStore(t)
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defer cleanup()
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// Initially no remotes (except possibly origin if Dolt adds one by default)
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remotes, err := store.ListRemotes(ctx)
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if err != nil {
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t.Fatalf("failed to list remotes: %v", err)
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}
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t.Logf("Initial remotes: %d", len(remotes))
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// Add a test remote
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err = store.AddRemote(ctx, "test-peer", "file:///tmp/nonexistent")
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if err != nil {
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t.Logf("AddRemote returned: %v (may be expected)", err)
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}
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// List again
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remotes, err = store.ListRemotes(ctx)
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if err != nil {
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t.Fatalf("failed to list remotes after add: %v", err)
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}
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// Should have at least one remote now
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t.Logf("Remotes after add: %v", remotes)
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for _, r := range remotes {
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t.Logf(" %s: %s", r.Name, r.URL)
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}
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}
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// TestFederationSyncStatus tests the SyncStatus API
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func TestFederationSyncStatus(t *testing.T) {
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skipIfNoDolt(t)
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ctx, cancel := context.WithTimeout(context.Background(), time.Minute)
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defer cancel()
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store, cleanup := setupTestStore(t)
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defer cleanup()
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// Get status for a nonexistent peer (should not error, just return partial data)
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status, err := store.SyncStatus(ctx, "nonexistent-peer")
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if err != nil {
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t.Fatalf("SyncStatus failed: %v", err)
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}
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t.Logf("Status for nonexistent peer:")
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t.Logf(" Peer: %s", status.Peer)
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t.Logf(" LocalAhead: %d", status.LocalAhead)
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t.Logf(" LocalBehind: %d", status.LocalBehind)
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t.Logf(" HasConflicts: %v", status.HasConflicts)
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// LocalAhead/Behind should be -1 (unknown) for nonexistent peer
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if status.LocalAhead != -1 || status.LocalBehind != -1 {
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t.Logf("Note: Status returned values for nonexistent peer (may be expected behavior)")
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}
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}
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// TestFederationPushPullMethods tests PushTo and PullFrom
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func TestFederationPushPullMethods(t *testing.T) {
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skipIfNoDolt(t)
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ctx, cancel := context.WithTimeout(context.Background(), time.Minute)
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defer cancel()
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store, cleanup := setupTestStore(t)
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defer cleanup()
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// These should fail gracefully since no remote exists
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err := store.PushTo(ctx, "nonexistent")
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if err == nil {
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t.Log("PushTo to nonexistent peer succeeded (unexpected)")
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} else {
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t.Logf("✓ PushTo correctly failed: %v", err)
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}
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conflicts, err := store.PullFrom(ctx, "nonexistent")
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if err == nil {
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t.Logf("PullFrom from nonexistent peer succeeded with %d conflicts", len(conflicts))
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} else {
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t.Logf("✓ PullFrom correctly failed: %v", err)
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}
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err = store.Fetch(ctx, "nonexistent")
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if err == nil {
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t.Log("Fetch from nonexistent peer succeeded (unexpected)")
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} else {
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t.Logf("✓ Fetch correctly failed: %v", err)
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}
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}
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// setupFederationStore creates a Dolt store for federation testing
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func setupFederationStore(t *testing.T, ctx context.Context, path, prefix string) (*DoltStore, func()) {
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t.Helper()
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@@ -147,3 +147,55 @@ func AsRemote(s Storage) (RemoteStorage, bool) {
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rs, ok := s.(RemoteStorage)
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return rs, ok
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}
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// FederatedStorage extends RemoteStorage with peer-to-peer federation capabilities.
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// This interface supports synchronizing with multiple named peers (towns).
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type FederatedStorage interface {
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RemoteStorage
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// PushTo pushes commits to a specific peer remote.
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PushTo(ctx context.Context, peer string) error
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// PullFrom pulls changes from a specific peer remote.
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// Returns any merge conflicts if present.
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PullFrom(ctx context.Context, peer string) ([]Conflict, error)
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// Fetch fetches refs from a peer without merging.
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Fetch(ctx context.Context, peer string) error
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// ListRemotes returns configured remote names and URLs.
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ListRemotes(ctx context.Context) ([]RemoteInfo, error)
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// RemoveRemote removes a configured remote.
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RemoveRemote(ctx context.Context, name string) error
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// SyncStatus returns the sync status with a peer.
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SyncStatus(ctx context.Context, peer string) (*SyncStatus, error)
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}
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// RemoteInfo describes a configured remote.
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type RemoteInfo struct {
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Name string // Remote name (e.g., "town-beta")
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URL string // Remote URL (e.g., "dolthub://org/repo")
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}
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// SyncStatus describes the synchronization state with a peer.
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type SyncStatus struct {
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Peer string // Peer name
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LastSync time.Time // When last synced
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LocalAhead int // Commits ahead of peer
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LocalBehind int // Commits behind peer
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HasConflicts bool // Whether there are unresolved conflicts
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}
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// IsFederated checks if a storage instance supports federation.
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func IsFederated(s Storage) bool {
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_, ok := s.(FederatedStorage)
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return ok
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}
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// AsFederated attempts to cast a Storage to FederatedStorage.
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func AsFederated(s Storage) (FederatedStorage, bool) {
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fs, ok := s.(FederatedStorage)
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return fs, ok
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}
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