From 3f858132c3de8449aff08be10ea2f54f72c6403f Mon Sep 17 00:00:00 2001
From: Alexander Zavorotynskiy <zavorotynskiy@pm.me>
Date: Wed, 30 Aug 2023 15:39:49 +0200
Subject: [PATCH] fix(backend): found and fixed an issue in the method for
 generating sessionID using startTimestamp and extraction this timestamp back
 from sessionID

---
 backend/pkg/flakeid/flakeid.go | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/backend/pkg/flakeid/flakeid.go b/backend/pkg/flakeid/flakeid.go
index c54b990a5..543e69ea6 100644
--- a/backend/pkg/flakeid/flakeid.go
+++ b/backend/pkg/flakeid/flakeid.go
@@ -3,12 +3,12 @@ package flakeid
 const (
 	SEQ_ID_SIZE     = 8
 	SHARD_ID_SIZE   = 16
-	TIMESTAMP_SIZE  = 64 - SEQ_ID_SIZE - SHARD_ID_SHIFT
+	TIMESTAMP_SIZE  = 64 - SEQ_ID_SIZE - SHARD_ID_SIZE
 	SEQ_ID_MAX      = 1<<SEQ_ID_SIZE - 1
-	TIMESTAMP_MAX   = 1<<TIMESTAMP_SIZE - 1
-	TIMESTAMP_SHIFT = SEQ_ID_SIZE + SHARD_ID_SHIFT
+	TIMESTAMP_MAX   = 1<<TIMESTAMP_SIZE - 1 // 30 years from EPOCH date
+	TIMESTAMP_SHIFT = SEQ_ID_SIZE + SHARD_ID_SIZE
 	SHARD_ID_SHIFT  = SEQ_ID_SIZE
-	EPOCH           = 1550000000000
+	EPOCH           = 1550000000000 // Tue Feb 12 2019 19:33:20 GMT+0000
 )
 
 func compose(timestamp uint64, shardID uint16, seqID byte) uint64 {
@@ -16,5 +16,5 @@ func compose(timestamp uint64, shardID uint16, seqID byte) uint64 {
 }
 
 func extractTimestamp(id uint64) uint64 {
-	return (id >> TIMESTAMP_SHIFT)
+	return id >> TIMESTAMP_SHIFT
 }