server/id.go

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package main
import (
"crypto/md5"
"fmt"
"io"
"time"
)
type IdGenerator struct {
id chan int64
}
func NewIdGenerator() *IdGenerator {
g := IdGenerator{}
g.id = make(chan int64)
go func() {
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var i int64
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for i = 0; ; i++ {
g.id <- i
}
}()
return &g
}
func (id *IdGenerator) Hash() string {
h := md5.New()
ns := time.Now().UnixNano() + <-id.id
io.WriteString(h, fmt.Sprintf("%d", ns))
return fmt.Sprintf("%x", h.Sum(nil))
}