From 3991c526892c90f6d88324af2d042e2e0e62eaad Mon Sep 17 00:00:00 2001
From: Colin Henry <jchenry@users.noreply.github.com>
Date: Thu, 9 Jul 2020 20:02:23 -0700
Subject: [PATCH] moving from uint64 to int64. allows use of snowflakes id in
 databases

---
 snowflake/snowflake.go | 41 +++++++++++++++++++++--------------------
 1 file changed, 21 insertions(+), 20 deletions(-)

diff --git a/snowflake/snowflake.go b/snowflake/snowflake.go
index b606028..52dfdd1 100755
--- a/snowflake/snowflake.go
+++ b/snowflake/snowflake.go
@@ -16,30 +16,30 @@ const (
 	sequenceBits = 12
 
 	// Custom Epoch (January 1, 2015 Midnight UTC = 2015-01-01T00:00:00Z)
-	customEpoch uint64 = 1420070400000
+	customEpoch int64 = 1420070400000
 )
 
-var maxNodeID uint64
-var maxSequence uint64
+var maxNodeID int64
+var maxSequence int64
 
-var nodeID uint64
-var lastTimestamp uint64 = 0
-var sequence uint64
+var nodeID int64
+var lastTimestamp int64 = 0
+var sequence int64
 
 func init() {
-	maxNodeID = uint64(math.Pow(2, nodeIDBits) - 1)
-	maxSequence = uint64(math.Pow(2, sequenceBits) - 1)
+	maxNodeID = int64(math.Pow(2, nodeIDBits) - 1)
+	maxSequence = int64(math.Pow(2, sequenceBits) - 1)
 	nodeID = generateNodeID()
 }
 
-func generateNodeID() uint64 {
-	var nodeID uint64
+func generateNodeID() int64 {
+	var nodeID int64
 	if interfaces, err := net.Interfaces(); err == nil {
 		h := fnv.New32a()
 		for _, i := range interfaces {
 			h.Write(i.HardwareAddr)
 		}
-		nodeID = uint64(h.Sum32())
+		nodeID = int64(h.Sum32())
 	} else {
 		panic("interfaces not available")
 	}
@@ -51,7 +51,7 @@ var timestampMutex sync.Mutex
 var sequenceMutex sync.Mutex
 
 // Next returns the next logical snowflake
-func Next() uint64 {
+func Next() int64 {
 	timestampMutex.Lock()
 	currentTimestamp := ts()
 	timestampMutex.Unlock()
@@ -69,21 +69,22 @@ func Next() uint64 {
 	sequenceMutex.Unlock()
 
 	lastTimestamp = currentTimestamp
-	id := currentTimestamp << (totalBits - epochBits)
-	fmt.Printf("%b\n", id)
-	id |= (nodeID << (totalBits - epochBits - nodeIDBits))
-	fmt.Printf("%b\n", id)
-
+	// id := currentTimestamp << (totalBits - epochBits)
+	// id |= (nodeID << (totalBits - epochBits - nodeIDBits))
+	// id |= sequence
+	var id int64 = currentTimestamp << (nodeIDBits + sequenceBits)
+	id |= (nodeID << sequenceBits)
 	id |= sequence
+
 	fmt.Printf("%b\n", id)
 	return id
 }
 
-func ts() uint64 {
-	return uint64(time.Now().UnixNano()/1000000) - customEpoch
+func ts() int64 {
+	return int64(time.Now().UnixNano()/1000000) - customEpoch
 }
 
-func waitNextMillis(currentTimestamp uint64) uint64 {
+func waitNextMillis(currentTimestamp int64) int64 {
 	for currentTimestamp == lastTimestamp {
 		currentTimestamp = ts()
 	}