Monorepo for Tangled
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import ( "context" "crypto/rand" "encoding/hex" "errors" "fmt" "log/slog" "net" "net/http" "strings" "sync/atomic" "time"
"github.com/bluesky-social/indigo/service/tap" "tangled.org/core/api/tangled" "tangled.org/core/spindle/config")
func randomAdminPassword() (string, error) { var b [32]byte if _, err := rand.Read(b[:]); err != nil { return "", fmt.Errorf("generate tap admin password: %w", err) } return hex.EncodeToString(b[:]), nil}
func assertLoopbackBind(bind string) error { host, _, err := net.SplitHostPort(bind) if err != nil { return fmt.Errorf("parse tap bind %q: %w", bind, err) } if host == "" { return fmt.Errorf("embedded mode requires loopback host in tap bind %q", bind) } if strings.EqualFold(host, "localhost") { return nil } ip := net.ParseIP(host) if ip == nil || !ip.IsLoopback() { return fmt.Errorf("embedded tap bind %q must be loopback like 127.0.0.1 or ::1", bind) } return nil}
type embeddedTap struct { tap *tap.Tap logger *slog.Logger closed atomic.Bool}
func newEmbeddedTapConfig(cfg *config.Config) tap.Config { return tap.Config{ DatabaseURL: "sqlite://" + cfg.Server.Tap.DBPath, DBMaxConns: 32, PLCURL: cfg.Server.PlcUrl, RelayUrl: cfg.Server.Tap.RelayUrl, FirehoseParallelism: 4, ResyncParallelism: 2, OutboxParallelism: 1, FirehoseCursorSaveInterval: time.Second, RepoFetchTimeout: 5 * time.Minute, IdentityCacheSize: 50_000, EventCacheSize: 10_000, CollectionFilters: []string{tangled.RepoNSID, tangled.RepoCollaboratorNSID}, AdminPassword: cfg.Server.Tap.AdminPassword, RetryTimeout: 60 * time.Second, }}
func startEmbeddedTap(ctx context.Context, cfg *config.Config, logger *slog.Logger) (*embeddedTap, error) { if err := assertLoopbackBind(cfg.Server.Tap.Bind); err != nil { return nil, err }
tcfg := newEmbeddedTapConfig(cfg)
t, err := tap.New(tcfg) if err != nil { return nil, fmt.Errorf("tap.New: %w", err) }
go func() { if err := t.Firehose.Run(ctx); err != nil && !errors.Is(err, context.Canceled) { logger.Error("firehose terminated", "err", err) } }() t.Run(ctx) go func() { logger.Info("tap http server listening", "bind", cfg.Server.Tap.Bind) if err := t.Server.Start(cfg.Server.Tap.Bind); err != nil && !errors.Is(err, http.ErrServerClosed) { logger.Error("tap http server terminated", "err", err) } }()
if err := waitForListener(ctx, cfg.Server.Tap.Bind, time.Now().Add(10*time.Second)); err != nil { logger.Warn("tap http server unreachable before timeout", "bind", cfg.Server.Tap.Bind, "err", err) }
return &embeddedTap{tap: t, logger: logger}, nil}
func waitForListener(ctx context.Context, addr string, deadline time.Time) error { if ctx.Err() != nil { return ctx.Err() } if time.Now().After(deadline) { return fmt.Errorf("timed out waiting for %s", addr) } c, err := net.DialTimeout("tcp", addr, 100*time.Millisecond) if err == nil { c.Close() return nil } time.Sleep(50 * time.Millisecond) return waitForListener(ctx, addr, deadline)}
func (e *embeddedTap) Shutdown() { if e == nil || e.tap == nil { return } if e.closed.Swap(true) { return } shutdownCtx, cancel := context.WithTimeout(context.Background(), 10*time.Second) defer cancel() if err := e.tap.Server.Shutdown(shutdownCtx); err != nil { e.logger.Error("tap server shutdown failed", "err", err) } if err := e.tap.CloseDb(shutdownCtx); err != nil { e.logger.Error("tap db close failed", "err", err) }}