mirror of https://github.com/tidwall/tile38.git
46 lines
948 B
Go
46 lines
948 B
Go
package controller
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import (
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"crypto/md5"
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"crypto/rand"
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"encoding/binary"
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"encoding/hex"
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"io"
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"os"
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"sync/atomic"
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"time"
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)
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func bsonID() string {
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b := make([]byte, 12)
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binary.BigEndian.PutUint32(b, uint32(time.Now().Unix()))
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copy(b[4:], bsonMachine)
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binary.BigEndian.PutUint32(b[8:], atomic.AddUint32(&bsonCounter, 1))
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binary.BigEndian.PutUint16(b[7:], bsonProcess)
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return hex.EncodeToString(b)
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}
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var (
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bsonProcess = uint16(os.Getpid())
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bsonMachine = func() []byte {
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host, err := os.Hostname()
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if err != nil {
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b := make([]byte, 3)
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if _, err := io.ReadFull(rand.Reader, b); err != nil {
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panic("random error: " + err.Error())
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}
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return b
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}
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hw := md5.New()
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hw.Write([]byte(host))
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return hw.Sum(nil)[:3]
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}()
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bsonCounter = func() uint32 {
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b := make([]byte, 4)
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if _, err := io.ReadFull(rand.Reader, b); err != nil {
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panic("random error: " + err.Error())
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}
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return binary.BigEndian.Uint32(b)
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}()
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)
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