add missing source file

cmd/tools/cdb/utils.go

@@ -0,0 +1,54 @@
+package main
+
+import (
+	"math"
+
+	"github.com/uber/cherami-server/storage"
+	"github.com/uber/cherami-thrift/.generated/go/store"
+
+	"github.com/apache/thrift/lib/go/thrift"
+)
+
+// -- decode message/address -- //
+const (
+	seqNumBits = 26
+
+	invalidKey = math.MaxInt64
+
+	seqNumBitmask    = (int64(1) << seqNumBits) - 1
+	timestampBitmask = math.MaxInt64 &^ seqNumBitmask
+	seqNumMax        = int64(math.MaxInt64-2) & seqNumBitmask
+
+	seqNumUnspecifiedSeal = int64(math.MaxInt64 - 1)
+)
+
+func deconstructKey(key storage.Key) (visibilityTime int64, seqNum int64) {
+	return int64(int64(key) & timestampBitmask), int64(int64(key) & seqNumBitmask)
+}
+
+func deconstructSealExtentKey(key storage.Key) (seqNum int64) {
+
+	seqNum = int64(key) & seqNumBitmask
+
+	// we use the special seqnum ('MaxInt64 - 1') when the extent has been sealed
+	// at an "unspecified" seqnum; check for this case, and return appropriate value
+	if seqNum == (seqNumBitmask - 1) {
+		seqNum = seqNumUnspecifiedSeal
+	}
+
+	return
+}
+
+func isSealExtentKey(key storage.Key) bool {
+	return key != storage.InvalidKey && (int64(key)&timestampBitmask) == timestampBitmask
+}
+
+func deserializeMessage(data []byte) (*store.AppendMessage, error) {
+	msg := &store.AppendMessage{}
+	deserializer := thrift.NewTDeserializer()
+	if err := deserializer.Read(msg, data); err != nil {
+		return nil, err
+	}
+
+	return msg, nil
+}