From aa49b3700cc8775e696b14c1e95b1b4e6bab8aff Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Tom=C3=A1s=20Senart?= <tomas@soundcloud.com>
Date: Fri, 11 Oct 2013 13:57:07 +0200
Subject: [PATCH] Use encoding/hex for generating UID strings

BenchmarkFmtString   5000000         711 ns/op
BenchmarkHexString  10000000         171 ns/op
---
 src/http/uid.go      |  4 ++--
 src/http/uid_test.go | 21 +++++++++++++++++++++
 2 files changed, 23 insertions(+), 2 deletions(-)
 create mode 100644 src/http/uid_test.go

diff --git a/src/http/uid.go b/src/http/uid.go
index da3a468..45e5898 100644
--- a/src/http/uid.go
+++ b/src/http/uid.go
@@ -2,7 +2,7 @@ package http
 
 import (
 	"crypto/rand"
-	"fmt"
+	"encoding/hex"
 	"io"
 )
 
@@ -20,5 +20,5 @@ func uid() string {
 		panic(err)
 	}
 
-	return fmt.Sprintf("%x", id)
+	return hex.EncodeToString(id)
 }
diff --git a/src/http/uid_test.go b/src/http/uid_test.go
new file mode 100644
index 0000000..3fa2061
--- /dev/null
+++ b/src/http/uid_test.go
@@ -0,0 +1,21 @@
+package http
+
+import (
+	"encoding/hex"
+	"fmt"
+	"testing"
+)
+
+func BenchmarkFmtString(b *testing.B) {
+	id := []byte("1234567891234567")
+	for i := 0; i < b.N; i++ {
+		fmt.Sprintf("%x", id)
+	}
+}
+
+func BenchmarkHexString(b *testing.B) {
+	id := []byte("1234567891234567")
+	for i := 0; i < b.N; i++ {
+		hex.EncodeToString(id)
+	}
+}