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feat: added func SetRand(r io.Reader) #106

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feat: added func SetRand(r io.Reader) #106

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20 changes: 17 additions & 3 deletions id.go
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Original file line number Diff line number Diff line change
Expand Up @@ -43,12 +43,13 @@ package xid

import (
"bytes"
"crypto/sha256"
"crypto/rand"
"crypto/sha256"
"database/sql/driver"
"encoding/binary"
"fmt"
"hash/crc32"
"io"
"io/ioutil"
"os"
"sort"
Expand Down Expand Up @@ -85,6 +86,9 @@ var (

// dec is the decoding map for base32 encoding
dec [256]byte

// rander is seto to default rand.Reader
rander = rand.Reader
)

func init() {
Expand Down Expand Up @@ -119,7 +123,7 @@ func readMachineID() []byte {
copy(id, hw.Sum(nil))
} else {
// Fallback to rand number if machine id can't be gathered
if _, randErr := rand.Reader.Read(id); randErr != nil {
if _, randErr := rander.Read(id); randErr != nil {
panic(fmt.Errorf("xid: cannot get hostname nor generate a random number: %v; %v", err, randErr))
}
}
Expand All @@ -129,7 +133,7 @@ func readMachineID() []byte {
// randInt generates a random uint32
func randInt() uint32 {
b := make([]byte, 3)
if _, err := rand.Reader.Read(b); err != nil {
if _, err := rander.Read(b); err != nil {
panic(fmt.Errorf("xid: cannot generate random number: %v;", err))
}
return uint32(b[0])<<16 | uint32(b[1])<<8 | uint32(b[2])
Expand Down Expand Up @@ -388,3 +392,13 @@ func (s sorter) Swap(i, j int) {
func Sort(ids []ID) {
sort.Sort(sorter(ids))
}

// SetRand sets the random number generator to to an io.Reader.
// Calling with nil sets the random number generator to the default generator.
func SetRand(r io.Reader) {
if r == nil {
rander = rand.Reader
return
}
rander = r
}