diff options
Diffstat (limited to 'kube2msb/src/kube2msb/vendor/k8s.io/kubernetes/pkg/util/rand/rand.go')
-rw-r--r-- | kube2msb/src/kube2msb/vendor/k8s.io/kubernetes/pkg/util/rand/rand.go | 83 |
1 files changed, 83 insertions, 0 deletions
diff --git a/kube2msb/src/kube2msb/vendor/k8s.io/kubernetes/pkg/util/rand/rand.go b/kube2msb/src/kube2msb/vendor/k8s.io/kubernetes/pkg/util/rand/rand.go new file mode 100644 index 0000000..134c152 --- /dev/null +++ b/kube2msb/src/kube2msb/vendor/k8s.io/kubernetes/pkg/util/rand/rand.go @@ -0,0 +1,83 @@ +/* +Copyright 2015 The Kubernetes Authors. + +Licensed under the Apache License, Version 2.0 (the "License"); +you may not use this file except in compliance with the License. +You may obtain a copy of the License at + + http://www.apache.org/licenses/LICENSE-2.0 + +Unless required by applicable law or agreed to in writing, software +distributed under the License is distributed on an "AS IS" BASIS, +WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +See the License for the specific language governing permissions and +limitations under the License. +*/ + +// Package rand provides utilities related to randomization. +package rand + +import ( + "math/rand" + "sync" + "time" +) + +var letters = []rune("abcdefghijklmnopqrstuvwxyz0123456789") +var numLetters = len(letters) +var rng = struct { + sync.Mutex + rand *rand.Rand +}{ + rand: rand.New(rand.NewSource(time.Now().UTC().UnixNano())), +} + +// Intn generates an integer in range [0,max). +// By design this should panic if input is invalid, <= 0. +func Intn(max int) int { + rng.Lock() + defer rng.Unlock() + return rng.rand.Intn(max) +} + +// IntnRange generates an integer in range [min,max). +// By design this should panic if input is invalid, <= 0. +func IntnRange(min, max int) int { + rng.Lock() + defer rng.Unlock() + return rng.rand.Intn(max-min) + min +} + +// IntnRange generates an int64 integer in range [min,max). +// By design this should panic if input is invalid, <= 0. +func Int63nRange(min, max int64) int64 { + rng.Lock() + defer rng.Unlock() + return rng.rand.Int63n(max-min) + min +} + +// Seed seeds the rng with the provided seed. +func Seed(seed int64) { + rng.Lock() + defer rng.Unlock() + + rng.rand = rand.New(rand.NewSource(seed)) +} + +// Perm returns, as a slice of n ints, a pseudo-random permutation of the integers [0,n) +// from the default Source. +func Perm(n int) []int { + rng.Lock() + defer rng.Unlock() + return rng.rand.Perm(n) +} + +// String generates a random alphanumeric string n characters long. This will +// panic if n is less than zero. +func String(length int) string { + b := make([]rune, length) + for i := range b { + b[i] = letters[Intn(numLetters)] + } + return string(b) +} |