From ca03dc60f7d457ad9e26e7ec0437fa8ac91057ec Mon Sep 17 00:00:00 2001
From: fiatjaf <fiatjaf@gmail.com>
Date: Sun, 29 Jun 2025 22:20:30 -0300
Subject: [PATCH] eventstore/lmdb,mmm: fix key size for "a"-style tags.

---
 eventstore/lmdb/helpers.go | 8 ++++----
 eventstore/mmm/helpers.go  | 8 ++++----
 2 files changed, 8 insertions(+), 8 deletions(-)

diff --git a/eventstore/lmdb/helpers.go b/eventstore/lmdb/helpers.go
index dc87f95..ad81416 100644
--- a/eventstore/lmdb/helpers.go
+++ b/eventstore/lmdb/helpers.go
@@ -147,7 +147,7 @@ func (b *LMDBBackend) getTagIndexPrefix(tagName string, tagValue string) (lmdb.D
 
 	// if it's 32 bytes as hex, save it as bytes
 	if len(tagValue) == 64 {
-		// but we actually only use the first 8 bytes, with tag name prefix
+		// but we actually only use the first 8 bytes, with letter (tag name) prefix
 		k = make([]byte, 1+8+4)
 		if _, err := hex.Decode(k[1:1+8], []byte(tagValue[0:8*2])); err == nil {
 			k[0] = letterPrefix
@@ -157,10 +157,10 @@ func (b *LMDBBackend) getTagIndexPrefix(tagName string, tagValue string) (lmdb.D
 		}
 	}
 
-	// if it looks like an "a" tag, index it in this special format (no tag name prefix for special indexes)
+	// if it looks like an "a" tag, index it in this special format, with letter (tag name) prefix
 	spl := strings.Split(tagValue, ":")
 	if len(spl) == 3 && len(spl[1]) == 64 {
-		k = make([]byte, 1+2+8+30)
+		k = make([]byte, 1+2+8+30+4)
 		if _, err := hex.Decode(k[1+2:1+2+8], []byte(spl[1][0:8*2])); err == nil {
 			if kind, err := strconv.ParseUint(spl[0], 10, 16); err == nil {
 				k[0] = letterPrefix
@@ -175,7 +175,7 @@ func (b *LMDBBackend) getTagIndexPrefix(tagName string, tagValue string) (lmdb.D
 		}
 	}
 
-	// index whatever else as a md5 hash of the contents with tag name prefix
+	// index whatever else as a md5 hash of the contents, with letter (tag name) prefix
 	h := md5.New()
 	h.Write([]byte(tagValue))
 	k = make([]byte, 1, 1+16+4)
diff --git a/eventstore/mmm/helpers.go b/eventstore/mmm/helpers.go
index 4add03a..37d51e0 100644
--- a/eventstore/mmm/helpers.go
+++ b/eventstore/mmm/helpers.go
@@ -134,7 +134,7 @@ func (il *IndexingLayer) getTagIndexPrefix(tagName string, tagValue string) (lmd
 
 	// if it's 32 bytes as hex, save it as bytes
 	if len(tagValue) == 64 {
-		// but we actually only use the first 8 bytes, with tag name prefix
+		// but we actually only use the first 8 bytes, with letter (tag name) prefix
 		k = make([]byte, 1+8+4)
 		if _, err := hex.Decode(k[1:1+8], []byte(tagValue[0:8*2])); err == nil {
 			k[0] = letterPrefix
@@ -144,10 +144,10 @@ func (il *IndexingLayer) getTagIndexPrefix(tagName string, tagValue string) (lmd
 		}
 	}
 
-	// if it looks like an "a" tag, index it in this special format (no tag name prefix for special indexes)
+	// if it looks like an "a" tag, index it in this special format, with letter (tag name) prefix
 	spl := strings.Split(tagValue, ":")
 	if len(spl) == 3 && len(spl[1]) == 64 {
-		k = make([]byte, 1+2+8+30)
+		k = make([]byte, 1+2+8+30+4)
 		if _, err := hex.Decode(k[1+2:1+2+8], []byte(spl[1][0:8*2])); err == nil {
 			if kind, err := strconv.ParseUint(spl[0], 10, 16); err == nil {
 				k[0] = letterPrefix
@@ -162,7 +162,7 @@ func (il *IndexingLayer) getTagIndexPrefix(tagName string, tagValue string) (lmd
 		}
 	}
 
-	// index whatever else as utf-8, but limit it to 40 bytes, with tag name prefix
+	// index whatever else as utf-8, but limit it to 40 bytes, with letter (tag name) prefix
 	k = make([]byte, 1+40+4)
 	k[0] = letterPrefix
 	n := copy(k[1:1+40], tagValue)