initial import

example/siphash/sharding.go

@@ -0,0 +1,8 @@
+package sharding
+
+import "github.com/dchest/siphash"
+
+func sharding(token string) uint64 {
+	sum := siphash.Hash(0, 0, []byte(token))
+	return sum % 3
+}

example/siphash/sharding_test.go

@@ -0,0 +1,52 @@
+package sharding
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestSiphash64(t *testing.T) {
+	users := [][]string{
+		{
+			"5a4b7347200a6e0c185d6101",
+			"5b74c444acdd315c509b78fe",
+			"5c03e009a496130c2d9bc970",
+			"5c6ab5a74867f267d560dd9f",
+			"5b80a2b28be129507d176284",
+			"5a4b7347200a6e0c185d6101",
+			"5b74c444acdd315c509b78fe",
+			"5c03e009a496130c2d9bc970",
+			"5c6ab5a74867f267d560dd9f",
+			"5b80a2b28be129507d176284",
+			"5b8d157aacdd313508a892f2",
+			"5bf942b4a496130c2d9b7378",
+			"5c7fc28cd065f17f9edd3698",
+			"5bf40bd22c64fc5ea63a5174",
+		},
+		{
+			"5b839929acdd31271f03ded5",
+			"5bc9e28e2c64fc1a69a28e36",
+			"5b935d96a49613677b90b589",
+			"5b97acb2a49613677b910f47",
+			"5c902f3aff5be73689b4b522",
+		},
+		{
+			"5cdbee881a722f0001b9ce99",
+			"",
+			"5caca58f53add40001c20aaa",
+			"5beee68520c25041544e353a",
+			"5b0b957d0179b05769cbecde",
+			"5bbf45940ab7b7589aa1025f",
+			"5ac63009200a6e79cadf5175",
+			"5c94ed250ab7b7386c294662",
+			"5b9f8ccb2c64fc5832e47d3f",
+		},
+	}
+
+	for shard, ids := range users {
+		for _, id := range ids {
+			assert.Equal(t, uint64(shard), sharding(id))
+		}
+	}
+}