need the actually new file

pkg/atproto/directory.go

@@ -0,0 +1,58 @@
+package atproto
+
+import (
+	"context"
+	"net"
+	"net/http"
+	"sync"
+	"time"
+
+	"github.com/bluesky-social/indigo/atproto/identity"
+	"github.com/earthboundkid/versioninfo/v2"
+)
+
+var (
+	// Shared identity directory instance (singleton)
+	sharedDirectory identity.Directory
+	directoryOnce   sync.Once
+)
+
+// GetDirectory returns a shared identity.Directory instance with an 8-hour cache TTL.
+// This is based on indigo's DefaultDirectory() but with a reduced cache TTL
+// to allow faster recovery from PDS migrations (8h instead of 24h).
+//
+// Using a shared instance ensures all identity lookups across the application
+// use the same cache, which is more memory-efficient and provides better cache hit rates.
+func GetDirectory() identity.Directory {
+	directoryOnce.Do(func() {
+		base := identity.BaseDirectory{
+			PLCURL: identity.DefaultPLCURL,
+			HTTPClient: http.Client{
+				Timeout: time.Second * 10,
+				Transport: &http.Transport{
+					// would want this around 100ms for services doing lots of handle resolution. Impacts PLC connections as well, but not too bad.
+					IdleConnTimeout: time.Millisecond * 1000,
+					MaxIdleConns:    100,
+				},
+			},
+			Resolver: net.Resolver{
+				Dial: func(ctx context.Context, network, address string) (net.Conn, error) {
+					d := net.Dialer{Timeout: time.Second * 3}
+					return d.DialContext(ctx, network, address)
+				},
+			},
+			TryAuthoritativeDNS: true,
+			// primary Bluesky PDS instance only supports HTTP resolution method
+			SkipDNSDomainSuffixes: []string{".bsky.social"},
+			UserAgent:             "indigo-identity/" + versioninfo.Short(),
+		}
+		// Cache configuration:
+		// - capacity: 250,000 entries
+		// - hitTTL: 8 hours (reduced from indigo's default 24h for faster PDS migration recovery)
+		// - errTTL: 2 minutes
+		// - invalidHandleTTL: 5 minutes
+		cached := identity.NewCacheDirectory(&base, 250_000, time.Hour*8, time.Minute*2, time.Minute*5)
+		sharedDirectory = &cached
+	})
+	return sharedDirectory
+}