summaryrefslogtreecommitdiffstats
path: root/dependencies/pkg/mod/github.com/google/uuid@v1.3.0/version4.go
diff options
context:
space:
mode:
Diffstat (limited to 'dependencies/pkg/mod/github.com/google/uuid@v1.3.0/version4.go')
-rw-r--r--dependencies/pkg/mod/github.com/google/uuid@v1.3.0/version4.go76
1 files changed, 76 insertions, 0 deletions
diff --git a/dependencies/pkg/mod/github.com/google/uuid@v1.3.0/version4.go b/dependencies/pkg/mod/github.com/google/uuid@v1.3.0/version4.go
new file mode 100644
index 0000000..7697802
--- /dev/null
+++ b/dependencies/pkg/mod/github.com/google/uuid@v1.3.0/version4.go
@@ -0,0 +1,76 @@
+// Copyright 2016 Google Inc. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package uuid
+
+import "io"
+
+// New creates a new random UUID or panics. New is equivalent to
+// the expression
+//
+// uuid.Must(uuid.NewRandom())
+func New() UUID {
+ return Must(NewRandom())
+}
+
+// NewString creates a new random UUID and returns it as a string or panics.
+// NewString is equivalent to the expression
+//
+// uuid.New().String()
+func NewString() string {
+ return Must(NewRandom()).String()
+}
+
+// NewRandom returns a Random (Version 4) UUID.
+//
+// The strength of the UUIDs is based on the strength of the crypto/rand
+// package.
+//
+// Uses the randomness pool if it was enabled with EnableRandPool.
+//
+// A note about uniqueness derived from the UUID Wikipedia entry:
+//
+// Randomly generated UUIDs have 122 random bits. One's annual risk of being
+// hit by a meteorite is estimated to be one chance in 17 billion, that
+// means the probability is about 0.00000000006 (6 × 10−11),
+// equivalent to the odds of creating a few tens of trillions of UUIDs in a
+// year and having one duplicate.
+func NewRandom() (UUID, error) {
+ if !poolEnabled {
+ return NewRandomFromReader(rander)
+ }
+ return newRandomFromPool()
+}
+
+// NewRandomFromReader returns a UUID based on bytes read from a given io.Reader.
+func NewRandomFromReader(r io.Reader) (UUID, error) {
+ var uuid UUID
+ _, err := io.ReadFull(r, uuid[:])
+ if err != nil {
+ return Nil, err
+ }
+ uuid[6] = (uuid[6] & 0x0f) | 0x40 // Version 4
+ uuid[8] = (uuid[8] & 0x3f) | 0x80 // Variant is 10
+ return uuid, nil
+}
+
+func newRandomFromPool() (UUID, error) {
+ var uuid UUID
+ poolMu.Lock()
+ if poolPos == randPoolSize {
+ _, err := io.ReadFull(rander, pool[:])
+ if err != nil {
+ poolMu.Unlock()
+ return Nil, err
+ }
+ poolPos = 0
+ }
+ copy(uuid[:], pool[poolPos:(poolPos+16)])
+ poolPos += 16
+ poolMu.Unlock()
+
+ uuid[6] = (uuid[6] & 0x0f) | 0x40 // Version 4
+ uuid[8] = (uuid[8] & 0x3f) | 0x80 // Variant is 10
+ return uuid, nil
+}