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https://github.com/Mezeporta/Erupe.git
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2bd5f98f32
Add package-level documentation (doc.go) to all 22 first-party packages and godoc comments to ~150 previously undocumented exported symbols across common/, network/, and server/.
52 lines
1.2 KiB
Go
52 lines
1.2 KiB
Go
package token
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import (
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"math/rand"
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"sync"
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"time"
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)
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// SafeRand is a concurrency-safe wrapper around *rand.Rand.
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type SafeRand struct {
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mu sync.Mutex
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rng *rand.Rand
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}
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// NewSafeRand creates a SafeRand seeded with the current time.
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func NewSafeRand() *SafeRand {
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return &SafeRand{
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rng: rand.New(rand.NewSource(time.Now().UnixNano())),
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}
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}
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// Intn returns a non-negative pseudo-random int in [0,n). It is safe for
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// concurrent use.
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func (sr *SafeRand) Intn(n int) int {
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sr.mu.Lock()
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v := sr.rng.Intn(n)
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sr.mu.Unlock()
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return v
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}
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// Uint32 returns a pseudo-random uint32. It is safe for concurrent use.
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func (sr *SafeRand) Uint32() uint32 {
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sr.mu.Lock()
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v := sr.rng.Uint32()
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sr.mu.Unlock()
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return v
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}
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// RNG is the global concurrency-safe random number generator used throughout
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// the server for generating warehouse IDs, session tokens, and other values.
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var RNG = NewSafeRand()
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// Generate returns an alphanumeric token of specified length
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func Generate(length int) string {
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var chars = []rune("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789")
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b := make([]rune, length)
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for i := range b {
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b[i] = chars[RNG.Intn(len(chars))]
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}
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return string(b)
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}
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