sdk: fetch and cache profiles.

event.go

@@ -24,7 +24,7 @@ type Event struct {
 }
 
 const (
-	KindSetMetadata              int = 0
+	KindProfileMetadata          int = 0
 	KindTextNote                 int = 1
 	KindRecommendServer          int = 2
 	KindContactList              int = 3

sdk/init.go

@@ -11,13 +11,14 @@ import (
 type System struct {
 	relaysCache      cache.Cache32[[]Relay]
 	followsCache     cache.Cache32[[]Follow]
-	metadataCache   cache.Cache32[*ProfileMetadata]
+	metadataCache    cache.Cache32[ProfileMetadata]
 	pool             *nostr.SimplePool
-	metadataRelays  []string
 	relayListRelays  []string
+	followListRelays []string
+	metadataRelays   []string
 }
 
-func (sys System) FetchRelaysForPubkey(ctx context.Context, pubkey string) []Relay {
+func (sys System) FetchRelays(ctx context.Context, pubkey string) []Relay {
 	if v, ok := sys.relaysCache.Get(pubkey); ok {
 		return v
 	}
@@ -29,8 +30,8 @@ func (sys System) FetchRelaysForPubkey(ctx context.Context, pubkey string) []Rel
 	return res
 }
 
-func (sys System) FetchOutboxRelaysForPubkey(ctx context.Context, pubkey string) []string {
+func (sys System) FetchOutboxRelays(ctx context.Context, pubkey string) []string {
-	relays := sys.FetchRelaysForPubkey(ctx, pubkey)
+	relays := sys.FetchRelays(ctx, pubkey)
 	result := make([]string, 0, len(relays))
 	for _, relay := range relays {
 		if relay.Outbox {
@@ -39,3 +40,15 @@ func (sys System) FetchOutboxRelaysForPubkey(ctx context.Context, pubkey string)
 	}
 	return result
 }
+
+func (sys System) FetchProfileMetadata(ctx context.Context, pubkey string) ProfileMetadata {
+	if v, ok := sys.metadataCache.Get(pubkey); ok {
+		return v
+	}
+
+	ctx, cancel := context.WithTimeout(ctx, time.Second*5)
+	defer cancel()
+	res := FetchProfileMetadata(ctx, sys.pool, pubkey, sys.metadataRelays...)
+	sys.metadataCache.SetWithTTL(pubkey, res, time.Hour*6)
+	return res
+}

sdk/metadata.go

@@ -28,10 +28,32 @@ func (p ProfileMetadata) Npub() string {
 }
 
 func (p ProfileMetadata) Nprofile(ctx context.Context, sys *System, nrelays int) string {
-	v, _ := nip19.EncodeProfile(p.pubkey, sys.FetchOutboxRelaysForPubkey(ctx, p.pubkey))
+	v, _ := nip19.EncodeProfile(p.pubkey, sys.FetchOutboxRelays(ctx, p.pubkey))
 	return v
 }
 
+func FetchProfileMetadata(ctx context.Context, pool *nostr.SimplePool, pubkey string, relays ...string) ProfileMetadata {
+	ctx, cancel := context.WithCancel(ctx)
+	defer cancel()
+
+	ch := pool.SubManyEose(ctx, relays, nostr.Filters{
+		{
+			Kinds:   []int{nostr.KindProfileMetadata},
+			Authors: []string{pubkey},
+			Limit:   1,
+		},
+	})
+
+	for ie := range ch {
+		if m, err := ParseMetadata(ie.Event); err == nil {
+			m.pubkey = pubkey
+			return *m
+		}
+	}
+
+	return ProfileMetadata{pubkey: pubkey}
+}
+
 func ParseMetadata(event *nostr.Event) (*ProfileMetadata, error) {
 	if event.Kind != 0 {
 		return nil, fmt.Errorf("event %s is kind %d, not 0", event.ID, event.Kind)

sdk/relays.go

@@ -13,9 +13,6 @@ type Relay struct {
 	Outbox bool
 }
 
-func FetchOutboxRelaysForPubkey(ctx context.Context, pool *nostr.SimplePool, pubkey string, n int) {
-}
-
 func FetchRelaysForPubkey(ctx context.Context, pool *nostr.SimplePool, pubkey string, relays ...string) []Relay {
 	ctx, cancel := context.WithCancel(ctx)
 	defer cancel()

subscription_test.go

@@ -66,7 +66,7 @@ func TestNestedSubscriptions(t *testing.T) {
 		select {
 		case event := <-sub.Events:
 			// now fetch author of this
-			sub, err := rl.Subscribe(context.Background(), Filters{{Kinds: []int{KindSetMetadata}, Authors: []string{event.PubKey}, Limit: 1}})
+			sub, err := rl.Subscribe(context.Background(), Filters{{Kinds: []int{KindProfileMetadata}, Authors: []string{event.PubKey}, Limit: 1}})
 			if err != nil {
 				t.Errorf("subscription 2 failed: %v", err)
 				return