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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,10 @@ | ||
| package cache | ||
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| import "time" | ||
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| type Cache32[V any] interface { | ||
| Get(k string) (v V, ok bool) | ||
| Delete(k string) | ||
| Set(k string, v V) bool | ||
| SetWithTTL(k string, v V, d time.Duration) bool | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,48 @@ | ||
| package cache_memory | ||
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| import ( | ||
| "encoding/binary" | ||
| "encoding/hex" | ||
| "time" | ||
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| "github.com/dgraph-io/ristretto" | ||
| ) | ||
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| type RistrettoCache[V any] struct { | ||
| Cache *ristretto.Cache[string, V] | ||
| } | ||
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| func New32[V any](max int64) *RistrettoCache[V] { | ||
| cache, _ := ristretto.NewCache(&ristretto.Config[string, V]{ | ||
| NumCounters: max * 10, | ||
| MaxCost: max, | ||
| BufferItems: 64, | ||
| KeyToHash: func(key string) (uint64, uint64) { return h32(key), 0 }, | ||
| }) | ||
| return &RistrettoCache[V]{Cache: cache} | ||
| } | ||
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| func (s RistrettoCache[V]) Get(k string) (v V, ok bool) { return s.Cache.Get(k) } | ||
| func (s RistrettoCache[V]) Delete(k string) { s.Cache.Del(k) } | ||
| func (s RistrettoCache[V]) Set(k string, v V) bool { return s.Cache.Set(k, v, 1) } | ||
| func (s RistrettoCache[V]) SetWithTTL(k string, v V, d time.Duration) bool { | ||
| return s.Cache.SetWithTTL(k, v, 1, d) | ||
| } | ||
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| func h32(key string) uint64 { | ||
| // we get an event id or pubkey as hex, | ||
| // so just extract the last 8 bytes from it and turn them into a uint64 | ||
| return shortUint64(key) | ||
| } | ||
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| func shortUint64(idOrPubkey string) uint64 { | ||
| length := len(idOrPubkey) | ||
| if length < 8 { | ||
| return 0 | ||
| } | ||
| b, err := hex.DecodeString(idOrPubkey[length-8:]) | ||
| if err != nil { | ||
| return 0 | ||
| } | ||
| return uint64(binary.BigEndian.Uint32(b)) | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,7 @@ | ||
| package sdk | ||
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| type Follow struct { | ||
| Pubkey string | ||
| Relay string | ||
| Petname string | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,41 @@ | ||
| package sdk | ||
|
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| import ( | ||
| "context" | ||
| "time" | ||
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| "github.com/nbd-wtf/go-nostr" | ||
| "github.com/nbd-wtf/go-nostr/sdk/cache" | ||
| ) | ||
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| type System struct { | ||
| relaysCache cache.Cache32[[]Relay] | ||
| followsCache cache.Cache32[[]Follow] | ||
| metadataCache cache.Cache32[*ProfileMetadata] | ||
| pool *nostr.SimplePool | ||
| metadataRelays []string | ||
| relayListRelays []string | ||
| } | ||
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| func (sys System) FetchRelaysForPubkey(ctx context.Context, pubkey string) []Relay { | ||
| if v, ok := sys.relaysCache.Get(pubkey); ok { | ||
| return v | ||
| } | ||
|
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| ctx, cancel := context.WithTimeout(ctx, time.Second*5) | ||
| defer cancel() | ||
| res := FetchRelaysForPubkey(ctx, sys.pool, pubkey, sys.relayListRelays...) | ||
| sys.relaysCache.SetWithTTL(pubkey, res, time.Hour*6) | ||
| return res | ||
| } | ||
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| func (sys System) FetchOutboxRelaysForPubkey(ctx context.Context, pubkey string) []string { | ||
| relays := sys.FetchRelaysForPubkey(ctx, pubkey) | ||
| result := make([]string, 0, len(relays)) | ||
| for _, relay := range relays { | ||
| if relay.Outbox { | ||
| result = append(result, relay.URL) | ||
| } | ||
| } | ||
| return result | ||
| } |
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