1 files changed, 39 insertions, 0 deletions
diff --git a/vendor/github.com/hashicorp/terraform/helper/resource/id.go b/vendor/github.com/hashicorp/terraform/helper/resource/id.go
new file mode 100644
index 00000000..629582b3
--- /dev/null
+++ b/vendor/github.com/hashicorp/terraform/helper/resource/id.go
@@ -0,0 +1,39 @@
+package resource
+
+import (
+	"crypto/rand"
+	"fmt"
+	"math/big"
+	"sync"
+)
+
+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.
+var idMutex sync.Mutex
+var idCounter = big.NewInt(0).SetBytes(randomBytes(12))
+
+// Helper for a resource to generate a unique identifier w/ default prefix
+func UniqueId() string {
+	return PrefixedUniqueId(UniqueIdPrefix)
+}
+
+// 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).
+func PrefixedUniqueId(prefix string) string {
+	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
+}