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
2026-01-20 20:47:05 -08:00
committed by Steve Yegge
parent cf6356b98a
commit 6190dd9362
4 changed files with 711 additions and 0 deletions

358
cmd/bd/federation.go Normal file
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@@ -0,0 +1,358 @@
package main
import (
"fmt"
"github.com/spf13/cobra"
"github.com/steveyegge/beads/internal/storage"
"github.com/steveyegge/beads/internal/storage/dolt"
"github.com/steveyegge/beads/internal/ui"
)
var (
federationPeer string
federationStrategy string
)
var federationCmd = &cobra.Command{
Use: "federation",
GroupID: "sync",
Short: "Manage peer-to-peer federation with other Gas Towns",
Long: `Manage peer-to-peer federation between Dolt-backed beads databases.
Federation enables synchronized issue tracking across multiple Gas Towns,
each maintaining their own Dolt database while sharing updates via remotes.
Requires the Dolt storage backend.`,
}
var federationSyncCmd = &cobra.Command{
Use: "sync [--peer name]",
Short: "Synchronize with a peer town",
Long: `Pull from and push to peer towns.
Without --peer, syncs with all configured peers.
With --peer, syncs only with the specified peer.
Handles merge conflicts using the configured strategy:
--strategy ours Keep local changes on conflict
--strategy theirs Accept remote changes on conflict
If no strategy is specified and conflicts occur, the sync will pause
and report which tables have conflicts for manual resolution.
Examples:
bd federation sync # Sync with all peers
bd federation sync --peer town-beta # Sync with specific peer
bd federation sync --strategy theirs # Auto-resolve using remote values`,
Run: runFederationSync,
}
var federationStatusCmd = &cobra.Command{
Use: "status [--peer name]",
Short: "Show federation sync status",
Long: `Show synchronization status with peer towns.
Displays:
- Configured peers and their URLs
- Commits ahead/behind each peer
- Whether there are unresolved conflicts
Examples:
bd federation status # Status for all peers
bd federation status --peer town-beta # Status for specific peer`,
Run: runFederationStatus,
}
var federationAddPeerCmd = &cobra.Command{
Use: "add-peer <name> <url>",
Short: "Add a federation peer",
Long: `Add a new federation peer remote.
The URL can be:
- dolthub://org/repo DoltHub hosted repository
- host:port/database Direct dolt sql-server connection
- file:///path/to/repo Local file path (for testing)
Examples:
bd federation add-peer town-beta dolthub://acme/town-beta-beads
bd federation add-peer town-gamma 192.168.1.100:3306/beads`,
Args: cobra.ExactArgs(2),
Run: runFederationAddPeer,
}
var federationRemovePeerCmd = &cobra.Command{
Use: "remove-peer <name>",
Short: "Remove a federation peer",
Args: cobra.ExactArgs(1),
Run: runFederationRemovePeer,
}
var federationListPeersCmd = &cobra.Command{
Use: "list-peers",
Short: "List configured federation peers",
Run: runFederationListPeers,
}
func init() {
// Add subcommands
federationCmd.AddCommand(federationSyncCmd)
federationCmd.AddCommand(federationStatusCmd)
federationCmd.AddCommand(federationAddPeerCmd)
federationCmd.AddCommand(federationRemovePeerCmd)
federationCmd.AddCommand(federationListPeersCmd)
// Flags for sync
federationSyncCmd.Flags().StringVar(&federationPeer, "peer", "", "Specific peer to sync with")
federationSyncCmd.Flags().StringVar(&federationStrategy, "strategy", "", "Conflict resolution strategy (ours|theirs)")
// Flags for status
federationStatusCmd.Flags().StringVar(&federationPeer, "peer", "", "Specific peer to check")
rootCmd.AddCommand(federationCmd)
}
func getFederatedStore() (*dolt.DoltStore, error) {
fs, ok := storage.AsFederated(store)
if !ok {
return nil, fmt.Errorf("federation requires Dolt backend (current backend does not support federation)")
}
// Type assert to get the concrete DoltStore for Sync method
ds, ok := fs.(*dolt.DoltStore)
if !ok {
return nil, fmt.Errorf("internal error: federated storage is not DoltStore")
}
return ds, nil
}
func runFederationSync(cmd *cobra.Command, args []string) {
ctx := rootCtx
ds, err := getFederatedStore()
if err != nil {
FatalErrorRespectJSON("%v", err)
}
// Validate strategy if provided
if federationStrategy != "" && federationStrategy != "ours" && federationStrategy != "theirs" {
FatalErrorRespectJSON("invalid strategy %q: must be 'ours' or 'theirs'", federationStrategy)
}
// Get peers to sync with
var peers []string
if federationPeer != "" {
peers = []string{federationPeer}
} else {
// Get all configured remotes
remotes, err := ds.ListRemotes(ctx)
if err != nil {
FatalErrorRespectJSON("failed to list peers: %v", err)
}
for _, r := range remotes {
// Skip 'origin' which is typically the backup remote, not a peer
if r.Name != "origin" {
peers = append(peers, r.Name)
}
}
}
if len(peers) == 0 {
FatalErrorRespectJSON("no federation peers configured (use 'bd federation add-peer' to add peers)")
}
// Sync with each peer
var results []*dolt.SyncResult
for _, peer := range peers {
if !jsonOutput {
fmt.Printf("%s Syncing with %s...\n", ui.RenderAccent("🔄"), peer)
}
result, err := ds.Sync(ctx, peer, federationStrategy)
results = append(results, result)
if err != nil {
if !jsonOutput {
fmt.Printf(" %s %v\n", ui.RenderFail("✗"), err)
}
continue
}
if !jsonOutput {
if result.Fetched {
fmt.Printf(" %s Fetched\n", ui.RenderPass("✓"))
}
if result.Merged {
fmt.Printf(" %s Merged", ui.RenderPass("✓"))
if result.PulledCommits > 0 {
fmt.Printf(" (%d commits)", result.PulledCommits)
}
fmt.Println()
}
if len(result.Conflicts) > 0 {
if result.ConflictsResolved {
fmt.Printf(" %s Resolved %d conflicts using %s strategy\n",
ui.RenderPass("✓"), len(result.Conflicts), federationStrategy)
} else {
fmt.Printf(" %s %d conflicts need resolution\n",
ui.RenderWarn("⚠"), len(result.Conflicts))
for _, c := range result.Conflicts {
fmt.Printf(" - %s\n", c.Field)
}
}
}
if result.Pushed {
fmt.Printf(" %s Pushed\n", ui.RenderPass("✓"))
} else if result.PushError != nil {
fmt.Printf(" %s Push skipped: %v\n", ui.RenderMuted("○"), result.PushError)
}
}
}
if jsonOutput {
outputJSON(map[string]interface{}{
"peers": peers,
"results": results,
})
}
}
func runFederationStatus(cmd *cobra.Command, args []string) {
ctx := rootCtx
ds, err := getFederatedStore()
if err != nil {
FatalErrorRespectJSON("%v", err)
}
// Get peers to check
var peers []string
if federationPeer != "" {
peers = []string{federationPeer}
} else {
remotes, err := ds.ListRemotes(ctx)
if err != nil {
FatalErrorRespectJSON("failed to list peers: %v", err)
}
for _, r := range remotes {
peers = append(peers, r.Name)
}
}
if len(peers) == 0 {
if jsonOutput {
outputJSON(map[string]interface{}{"peers": []string{}})
} else {
fmt.Println("No federation peers configured.")
}
return
}
var statuses []*storage.SyncStatus
for _, peer := range peers {
status, _ := ds.SyncStatus(ctx, peer)
statuses = append(statuses, status)
}
if jsonOutput {
outputJSON(map[string]interface{}{
"peers": peers,
"statuses": statuses,
})
return
}
fmt.Printf("\n%s Federation Status:\n\n", ui.RenderAccent("🌐"))
for _, status := range statuses {
fmt.Printf(" %s\n", ui.RenderAccent(status.Peer))
if status.LocalAhead >= 0 {
fmt.Printf(" Ahead: %d commits\n", status.LocalAhead)
fmt.Printf(" Behind: %d commits\n", status.LocalBehind)
} else {
fmt.Printf(" Status: not fetched yet\n")
}
if status.HasConflicts {
fmt.Printf(" %s Unresolved conflicts\n", ui.RenderWarn("⚠"))
}
fmt.Println()
}
}
func runFederationAddPeer(cmd *cobra.Command, args []string) {
ctx := rootCtx
name := args[0]
url := args[1]
fs, ok := storage.AsFederated(store)
if !ok {
FatalErrorRespectJSON("federation requires Dolt backend")
}
if err := fs.AddRemote(ctx, name, url); err != nil {
FatalErrorRespectJSON("failed to add peer: %v", err)
}
if jsonOutput {
outputJSON(map[string]interface{}{
"added": name,
"url": url,
})
return
}
fmt.Printf("Added peer %s: %s\n", ui.RenderAccent(name), url)
}
func runFederationRemovePeer(cmd *cobra.Command, args []string) {
ctx := rootCtx
name := args[0]
fs, ok := storage.AsFederated(store)
if !ok {
FatalErrorRespectJSON("federation requires Dolt backend")
}
if err := fs.RemoveRemote(ctx, name); err != nil {
FatalErrorRespectJSON("failed to remove peer: %v", err)
}
if jsonOutput {
outputJSON(map[string]interface{}{
"removed": name,
})
return
}
fmt.Printf("Removed peer: %s\n", name)
}
func runFederationListPeers(cmd *cobra.Command, args []string) {
ctx := rootCtx
fs, ok := storage.AsFederated(store)
if !ok {
FatalErrorRespectJSON("federation requires Dolt backend")
}
remotes, err := fs.ListRemotes(ctx)
if err != nil {
FatalErrorRespectJSON("failed to list peers: %v", err)
}
if jsonOutput {
outputJSON(remotes)
return
}
if len(remotes) == 0 {
fmt.Println("No federation peers configured.")
return
}
fmt.Printf("\n%s Federation Peers:\n\n", ui.RenderAccent("🌐"))
for _, r := range remotes {
fmt.Printf(" %s %s\n", ui.RenderAccent(r.Name), ui.RenderMuted(r.URL))
}
fmt.Println()
}

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@@ -0,0 +1,204 @@
package dolt
import (
"context"
"fmt"
"time"
"github.com/steveyegge/beads/internal/storage"
)
// FederatedStorage implementation for DoltStore
// These methods enable peer-to-peer synchronization between Gas Towns.
// PushTo pushes commits to a specific peer remote.
func (s *DoltStore) PushTo(ctx context.Context, peer string) error {
// DOLT_PUSH(remote, branch)
_, err := s.db.ExecContext(ctx, "CALL DOLT_PUSH(?, ?)", peer, s.branch)
if err != nil {
return fmt.Errorf("failed to push to peer %s: %w", peer, err)
}
return nil
}
// PullFrom pulls changes from a specific peer remote.
// Returns any merge conflicts if present.
func (s *DoltStore) PullFrom(ctx context.Context, peer string) ([]storage.Conflict, error) {
// DOLT_PULL(remote) - pulls and merges
_, err := s.db.ExecContext(ctx, "CALL DOLT_PULL(?)", peer)
if err != nil {
// Check if the error is due to merge conflicts
conflicts, conflictErr := s.GetConflicts(ctx)
if conflictErr == nil && len(conflicts) > 0 {
return conflicts, nil
}
return nil, fmt.Errorf("failed to pull from peer %s: %w", peer, err)
}
return nil, nil
}
// Fetch fetches refs from a peer without merging.
func (s *DoltStore) Fetch(ctx context.Context, peer string) error {
// DOLT_FETCH(remote)
_, err := s.db.ExecContext(ctx, "CALL DOLT_FETCH(?)", peer)
if err != nil {
return fmt.Errorf("failed to fetch from peer %s: %w", peer, err)
}
return nil
}
// ListRemotes returns configured remote names and URLs.
func (s *DoltStore) ListRemotes(ctx context.Context) ([]storage.RemoteInfo, error) {
rows, err := s.db.QueryContext(ctx, "SELECT name, url FROM dolt_remotes")
if err != nil {
return nil, fmt.Errorf("failed to list remotes: %w", err)
}
defer rows.Close()
var remotes []storage.RemoteInfo
for rows.Next() {
var r storage.RemoteInfo
if err := rows.Scan(&r.Name, &r.URL); err != nil {
return nil, fmt.Errorf("failed to scan remote: %w", err)
}
remotes = append(remotes, r)
}
return remotes, rows.Err()
}
// RemoveRemote removes a configured remote.
func (s *DoltStore) RemoveRemote(ctx context.Context, name string) error {
_, err := s.db.ExecContext(ctx, "CALL DOLT_REMOTE('remove', ?)", name)
if err != nil {
return fmt.Errorf("failed to remove remote %s: %w", name, err)
}
return nil
}
// SyncStatus returns the sync status with a peer.
func (s *DoltStore) SyncStatus(ctx context.Context, peer string) (*storage.SyncStatus, error) {
status := &storage.SyncStatus{
Peer: peer,
}
// Get ahead/behind counts by comparing refs
// This requires the peer to have been fetched first
query := `
SELECT
(SELECT COUNT(*) FROM dolt_log WHERE commit_hash NOT IN
(SELECT commit_hash FROM dolt_log AS OF CONCAT(?, '/', ?))) as ahead,
(SELECT COUNT(*) FROM dolt_log AS OF CONCAT(?, '/', ?) WHERE commit_hash NOT IN
(SELECT commit_hash FROM dolt_log)) as behind
`
err := s.db.QueryRowContext(ctx, query, peer, s.branch, peer, s.branch).
Scan(&status.LocalAhead, &status.LocalBehind)
if err != nil {
// If we can't get the status, return a partial result
// This happens when the remote branch doesn't exist locally yet
status.LocalAhead = -1
status.LocalBehind = -1
}
// Check for conflicts
conflicts, err := s.GetConflicts(ctx)
if err == nil && len(conflicts) > 0 {
status.HasConflicts = true
}
// TODO: Track last sync time in metadata
status.LastSync = time.Time{} // Zero time indicates never synced
return status, nil
}
// Sync performs a full bidirectional sync with a peer:
// 1. Fetch from peer
// 2. Merge peer's changes (handling conflicts per strategy)
// 3. Push local changes to peer
//
// Returns the sync result including any conflicts encountered.
func (s *DoltStore) Sync(ctx context.Context, peer string, strategy string) (*SyncResult, error) {
result := &SyncResult{
Peer: peer,
StartTime: time.Now(),
}
// Step 1: Fetch from peer
if err := s.Fetch(ctx, peer); err != nil {
result.Error = fmt.Errorf("fetch failed: %w", err)
return result, result.Error
}
result.Fetched = true
// Step 2: Get status before merge
beforeCommit, _ := s.GetCurrentCommit(ctx)
// Step 3: Merge peer's branch
remoteBranch := fmt.Sprintf("%s/%s", peer, s.branch)
conflicts, err := s.Merge(ctx, remoteBranch)
if err != nil {
result.Error = fmt.Errorf("merge failed: %w", err)
return result, result.Error
}
// Step 4: Handle conflicts if any
if len(conflicts) > 0 {
result.Conflicts = conflicts
if strategy == "" {
// No strategy specified, leave conflicts for manual resolution
result.Error = fmt.Errorf("merge conflicts require resolution (use --strategy ours|theirs)")
return result, result.Error
}
// Auto-resolve using strategy
for _, c := range conflicts {
if err := s.ResolveConflicts(ctx, c.Field, strategy); err != nil {
result.Error = fmt.Errorf("conflict resolution failed for %s: %w", c.Field, err)
return result, result.Error
}
}
result.ConflictsResolved = true
// Commit the resolution
if err := s.Commit(ctx, fmt.Sprintf("Resolve conflicts from %s using %s strategy", peer, strategy)); err != nil {
result.Error = fmt.Errorf("failed to commit conflict resolution: %w", err)
return result, result.Error
}
}
result.Merged = true
// Count pulled commits
afterCommit, _ := s.GetCurrentCommit(ctx)
if beforeCommit != afterCommit {
result.PulledCommits = 1 // Simplified - could count actual commits
}
// Step 5: Push our changes to peer
if err := s.PushTo(ctx, peer); err != nil {
// Push failure is not fatal - peer may not accept pushes
result.PushError = err
} else {
result.Pushed = true
}
result.EndTime = time.Now()
return result, nil
}
// SyncResult contains the outcome of a Sync operation.
type SyncResult struct {
Peer string
StartTime time.Time
EndTime time.Time
Fetched bool
Merged bool
Pushed bool
PulledCommits int
PushedCommits int
Conflicts []storage.Conflict
ConflictsResolved bool
Error error
PushError error // Non-fatal push error
}

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@@ -322,6 +322,103 @@ func TestFederationHistoryQueries(t *testing.T) {
}
}
// TestFederationListRemotes tests the ListRemotes API
func TestFederationListRemotes(t *testing.T) {
skipIfNoDolt(t)
ctx, cancel := context.WithTimeout(context.Background(), time.Minute)
defer cancel()
store, cleanup := setupTestStore(t)
defer cleanup()
// Initially no remotes (except possibly origin if Dolt adds one by default)
remotes, err := store.ListRemotes(ctx)
if err != nil {
t.Fatalf("failed to list remotes: %v", err)
}
t.Logf("Initial remotes: %d", len(remotes))
// Add a test remote
err = store.AddRemote(ctx, "test-peer", "file:///tmp/nonexistent")
if err != nil {
t.Logf("AddRemote returned: %v (may be expected)", err)
}
// List again
remotes, err = store.ListRemotes(ctx)
if err != nil {
t.Fatalf("failed to list remotes after add: %v", err)
}
// Should have at least one remote now
t.Logf("Remotes after add: %v", remotes)
for _, r := range remotes {
t.Logf(" %s: %s", r.Name, r.URL)
}
}
// TestFederationSyncStatus tests the SyncStatus API
func TestFederationSyncStatus(t *testing.T) {
skipIfNoDolt(t)
ctx, cancel := context.WithTimeout(context.Background(), time.Minute)
defer cancel()
store, cleanup := setupTestStore(t)
defer cleanup()
// Get status for a nonexistent peer (should not error, just return partial data)
status, err := store.SyncStatus(ctx, "nonexistent-peer")
if err != nil {
t.Fatalf("SyncStatus failed: %v", err)
}
t.Logf("Status for nonexistent peer:")
t.Logf(" Peer: %s", status.Peer)
t.Logf(" LocalAhead: %d", status.LocalAhead)
t.Logf(" LocalBehind: %d", status.LocalBehind)
t.Logf(" HasConflicts: %v", status.HasConflicts)
// LocalAhead/Behind should be -1 (unknown) for nonexistent peer
if status.LocalAhead != -1 || status.LocalBehind != -1 {
t.Logf("Note: Status returned values for nonexistent peer (may be expected behavior)")
}
}
// TestFederationPushPullMethods tests PushTo and PullFrom
func TestFederationPushPullMethods(t *testing.T) {
skipIfNoDolt(t)
ctx, cancel := context.WithTimeout(context.Background(), time.Minute)
defer cancel()
store, cleanup := setupTestStore(t)
defer cleanup()
// These should fail gracefully since no remote exists
err := store.PushTo(ctx, "nonexistent")
if err == nil {
t.Log("PushTo to nonexistent peer succeeded (unexpected)")
} else {
t.Logf("✓ PushTo correctly failed: %v", err)
}
conflicts, err := store.PullFrom(ctx, "nonexistent")
if err == nil {
t.Logf("PullFrom from nonexistent peer succeeded with %d conflicts", len(conflicts))
} else {
t.Logf("✓ PullFrom correctly failed: %v", err)
}
err = store.Fetch(ctx, "nonexistent")
if err == nil {
t.Log("Fetch from nonexistent peer succeeded (unexpected)")
} else {
t.Logf("✓ Fetch correctly failed: %v", err)
}
}
// setupFederationStore creates a Dolt store for federation testing
func setupFederationStore(t *testing.T, ctx context.Context, path, prefix string) (*DoltStore, func()) {
t.Helper()

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@@ -147,3 +147,55 @@ func AsRemote(s Storage) (RemoteStorage, bool) {
rs, ok := s.(RemoteStorage)
return rs, ok
}
// FederatedStorage extends RemoteStorage with peer-to-peer federation capabilities.
// This interface supports synchronizing with multiple named peers (towns).
type FederatedStorage interface {
RemoteStorage
// PushTo pushes commits to a specific peer remote.
PushTo(ctx context.Context, peer string) error
// PullFrom pulls changes from a specific peer remote.
// Returns any merge conflicts if present.
PullFrom(ctx context.Context, peer string) ([]Conflict, error)
// Fetch fetches refs from a peer without merging.
Fetch(ctx context.Context, peer string) error
// ListRemotes returns configured remote names and URLs.
ListRemotes(ctx context.Context) ([]RemoteInfo, error)
// RemoveRemote removes a configured remote.
RemoveRemote(ctx context.Context, name string) error
// SyncStatus returns the sync status with a peer.
SyncStatus(ctx context.Context, peer string) (*SyncStatus, error)
}
// RemoteInfo describes a configured remote.
type RemoteInfo struct {
Name string // Remote name (e.g., "town-beta")
URL string // Remote URL (e.g., "dolthub://org/repo")
}
// SyncStatus describes the synchronization state with a peer.
type SyncStatus struct {
Peer string // Peer name
LastSync time.Time // When last synced
LocalAhead int // Commits ahead of peer
LocalBehind int // Commits behind peer
HasConflicts bool // Whether there are unresolved conflicts
}
// IsFederated checks if a storage instance supports federation.
func IsFederated(s Storage) bool {
_, ok := s.(FederatedStorage)
return ok
}
// AsFederated attempts to cast a Storage to FederatedStorage.
func AsFederated(s Storage) (FederatedStorage, bool) {
fs, ok := s.(FederatedStorage)
return fs, ok
}