Update goleveldb vendored dependency (see #662)

vendor/github.com/syndtr/goleveldb/README.md

@@ -17,6 +17,8 @@ Usage
 
 Create or open a database:
 ```go
+// The returned DB instance is safe for concurrent use. Which mean that all
+// DB's methods may be called concurrently from multiple goroutine.
 db, err := leveldb.OpenFile("path/to/db", nil)
 ...
 defer db.Close()

vendor/github.com/syndtr/goleveldb/leveldb/db.go

@@ -844,7 +844,7 @@ func (db *DB) Get(key []byte, ro *opt.ReadOptions) (value []byte, err error) {
 
 // Has returns true if the DB does contains the given key.
 //
-// It is safe to modify the contents of the argument after Get returns.
+// It is safe to modify the contents of the argument after Has returns.
 func (db *DB) Has(key []byte, ro *opt.ReadOptions) (ret bool, err error) {
 	err = db.ok()
 	if err != nil {

vendor/github.com/syndtr/goleveldb/leveldb/db_test.go

@@ -2247,12 +2247,12 @@ func TestDB_GoleveldbIssue72and83(t *testing.T) {
 				k1checksum0 := binary.LittleEndian.Uint32(k1[len(k1)-4:])
 				k1checksum1 := util.NewCRC(k1[:len(k1)-4]).Value()
 				if k1checksum0 != k1checksum1 {
-					t.Fatalf("READER0 #%d.%d W#%d invalid K1 checksum: %#x != %#x", i, k, k1checksum0, k1checksum0)
+					t.Fatalf("READER0 #%d.%d W#%d invalid K1 checksum: %#x != %#x", i, k, writei, k1checksum0, k1checksum0)
 				}
 				k2checksum0 := binary.LittleEndian.Uint32(k2[len(k2)-4:])
 				k2checksum1 := util.NewCRC(k2[:len(k2)-4]).Value()
 				if k2checksum0 != k2checksum1 {
-					t.Fatalf("READER0 #%d.%d W#%d invalid K2 checksum: %#x != %#x", i, k, k2checksum0, k2checksum1)
+					t.Fatalf("READER0 #%d.%d W#%d invalid K2 checksum: %#x != %#x", i, k, writei, k2checksum0, k2checksum1)
 				}
 				kwritei := int(binary.LittleEndian.Uint32(k2[len(k2)-8:]))
 				if writei != kwritei {
@@ -2840,6 +2840,7 @@ func TestDB_BulkInsertDelete(t *testing.T) {
 		}
 	}
 
+	h.waitCompaction()
 	if tot := h.totalTables(); tot > 10 {
 		t.Fatalf("too many uncompacted tables: %d (%s)", tot, h.getTablesPerLevel())
 	}

vendor/github.com/syndtr/goleveldb/leveldb/doc.go

@@ -8,6 +8,8 @@
 //
 // Create or open a database:
 //
+//	// The returned DB instance is safe for concurrent use. Which mean that all
+//	// DB's methods may be called concurrently from multiple goroutine.
 //	db, err := leveldb.OpenFile("path/to/db", nil)
 //	...
 //	defer db.Close()

vendor/github.com/syndtr/goleveldb/leveldb/iterator/iter.go

@@ -88,7 +88,7 @@ type Iterator interface {
 	// its contents may change on the next call to any 'seeks method'.
 	Key() []byte
 
-	// Value returns the key of the current key/value pair, or nil if done.
+	// Value returns the value of the current key/value pair, or nil if done.
 	// The caller should not modify the contents of the returned slice, and
 	// its contents may change on the next call to any 'seeks method'.
 	Value() []byte

vendor/github.com/syndtr/goleveldb/leveldb/memdb/memdb.go

@@ -329,7 +329,7 @@ func (p *DB) Delete(key []byte) error {
 
 	h := p.nodeData[node+nHeight]
 	for i, n := range p.prevNode[:h] {
-		m := n + 4 + i
+		m := n + nNext + i
 		p.nodeData[m] = p.nodeData[p.nodeData[m]+nNext+i]
 	}
 

vendor/github.com/syndtr/goleveldb/leveldb/storage/file_storage.go

@@ -234,14 +234,30 @@ func (fs *fileStorage) SetMeta(fd FileDesc) (err error) {
 		return
 	}
 	_, err = fmt.Fprintln(w, fsGenName(fd))
-	// Close the file first.
-	if cerr := w.Close(); cerr != nil {
-		fs.log(fmt.Sprintf("close CURRENT.%d: %v", fd.Num, cerr))
+	if err != nil {
+		fs.log(fmt.Sprintf("write CURRENT.%d: %v", fd.Num, err))
+		return
+	}
+	if err = w.Sync(); err != nil {
+		fs.log(fmt.Sprintf("flush CURRENT.%d: %v", fd.Num, err))
+		return
+	}
+	if err = w.Close(); err != nil {
+		fs.log(fmt.Sprintf("close CURRENT.%d: %v", fd.Num, err))
+		return
 	}
 	if err != nil {
 		return
 	}
-	return rename(path, filepath.Join(fs.path, "CURRENT"))
+	if err = rename(path, filepath.Join(fs.path, "CURRENT")); err != nil {
+		fs.log(fmt.Sprintf("rename CURRENT.%d: %v", fd.Num, err))
+		return
+	}
+	// Sync root directory.
+	if err = syncDir(fs.path); err != nil {
+		fs.log(fmt.Sprintf("syncDir: %v", err))
+	}
+	return
 }
 
 func (fs *fileStorage) GetMeta() (fd FileDesc, err error) {