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package main
import (
"strings"
"sync"
"github.com/brianvoe/gofakeit/v6"
)
// uniqGen allows generating unique string values.
type uniqGen struct {
f *gofakeit.Faker
m map[strScope]int
mx sync.Mutex
}
type strScope struct {
scope string
value string
}
func newGen(f *gofakeit.Faker) *uniqGen {
return &uniqGen{
f: f,
m: make(map[strScope]int, 100000),
}
}
// PickOne will return a random item from a slice, and will not return the
// same value twice.
func (g *uniqGen) PickOne(s []string) string {
return g.Gen(func() string { return g.f.RandomString(s) })
}
// Gen will call `fn` until a unique value is returned.
func (g *uniqGen) Gen(fn func() string, scope ...string) string { return g.GenN(1, fn, scope...) }
// Gen will call `fn` until a value that has been returned less than N is provided.
func (g *uniqGen) GenN(n int, fn func() string, scope ...string) string {
g.mx.Lock()
defer g.mx.Unlock()
scopeVal := strings.Join(scope, "|")
var i int
for {
if i > 5 {
panic("aborted after 5 tries")
}
scope := strScope{
scope: scopeVal,
value: fn(),
}
if g.m[scope] >= n {
i++
continue
}
g.m[scope]++
return scope.value
}
}
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