1 files changed, 17 insertions, 16 deletions

diff --git a/vendor/github.com/hashicorp/terraform/helper/resource/id.go b/vendor/github.com/hashicorp/terraform/helper/resource/id.go
index 629582b..1cde67c 100644
--- a/vendor/github.com/hashicorp/terraform/helper/resource/id.go
+++ b/vendor/github.com/hashicorp/terraform/helper/resource/id.go
@@ -1,21 +1,17 @@
 package resource
 
 import (
-        "crypto/rand"
         "fmt"
-        "math/big"
+        "strings"
         "sync"
+        "time"
 )
 
 const UniqueIdPrefix = `terraform-`
 
-// idCounter is a randomly seeded monotonic counter for generating ordered
-// unique ids.  It uses a big.Int so we can easily increment a long numeric
-// string.  The max possible hex value here with 12 random bytes is
-// "01000000000000000000000000", so there's no chance of rollover during
-// operation.
+// idCounter is a monotonic counter for generating ordered unique ids.
 var idMutex sync.Mutex
-var idCounter = big.NewInt(0).SetBytes(randomBytes(12))
+var idCounter uint32
 
 // Helper for a resource to generate a unique identifier w/ default prefix
 func UniqueId() string {
@@ -25,15 +21,20 @@ func UniqueId() string {
 // Helper for a resource to generate a unique identifier w/ given prefix
 //
 // After the prefix, the ID consists of an incrementing 26 digit value (to match
-// previous timestamp output).
+// previous timestamp output).  After the prefix, the ID consists of a timestamp
+// and an incrementing 8 hex digit value The timestamp means that multiple IDs
+// created with the same prefix will sort in the order of their creation, even
+// across multiple terraform executions, as long as the clock is not turned back
+// between calls, and as long as any given terraform execution generates fewer
+// than 4 billion IDs.
 func PrefixedUniqueId(prefix string) string {
+        // Be precise to 4 digits of fractional seconds, but remove the dot before the
+        // fractional seconds.
+        timestamp := strings.Replace(
+                time.Now().UTC().Format("20060102150405.0000"), ".", "", 1)
+
         idMutex.Lock()
         defer idMutex.Unlock()
-        return fmt.Sprintf("%s%026x", prefix, idCounter.Add(idCounter, big.NewInt(1)))
-}
-
-func randomBytes(n int) []byte {
-        b := make([]byte, n)
-        rand.Read(b)
-        return b
+        idCounter++
+        return fmt.Sprintf("%s%s%08x", prefix, timestamp, idCounter)
 }