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utils.go
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utils.go
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package main
import (
"encoding/binary"
"encoding/json"
"fmt"
"io"
"net"
"time"
"github.com/globalsign/mgo/bson"
)
func MustReadInt32(r io.Reader) (n int32) {
err := binary.Read(r, binary.LittleEndian, &n)
if err != nil {
panic(err)
}
return
}
func ReadInt32(r io.Reader) (n int32, err error) {
err = binary.Read(r, binary.LittleEndian, &n)
return
}
func ReadUint32(r io.Reader) (n uint32, err error) {
err = binary.Read(r, binary.LittleEndian, &n)
return
}
func ReadInt64(r io.Reader) *int64 {
var n int64
err := binary.Read(r, binary.LittleEndian, &n)
if err != nil {
if err == io.EOF {
return nil
}
panic(err)
}
return &n
}
func ReadBytes(r io.Reader, n int) []byte {
b := make([]byte, n)
_, err := r.Read(b)
if err != nil {
if err == io.EOF {
return nil
}
panic(err)
}
return b
}
func ReadCString(r io.Reader) string {
var b []byte
var one = make([]byte, 1)
for {
_, err := r.Read(one)
if err != nil {
panic(err)
}
if one[0] == '\x00' {
break
}
b = append(b, one[0])
}
return string(b)
}
func ReadOne(r io.Reader) []byte {
docLen, err := ReadInt32(r)
if err != nil {
if err == io.EOF {
return nil
}
panic(err)
}
buf := make([]byte, int(docLen))
binary.LittleEndian.PutUint32(buf, uint32(docLen))
if _, err := io.ReadFull(r, buf[4:]); err != nil {
panic(err)
}
return buf
}
func ReadDocument(r io.Reader) (m bson.M) {
if one := ReadOne(r); one != nil {
err := bson.Unmarshal(one, &m)
if err != nil {
panic(err)
}
}
return m
}
func ReadDocuments(r io.Reader) (ms []bson.M) {
for {
m := ReadDocument(r)
if m == nil {
break
}
ms = append(ms, m)
}
return
}
func ToJson(v interface{}) string {
b, err := json.Marshal(v)
if err != nil {
return fmt.Sprintf("{\"error\":%s}", err.Error())
}
return string(b)
}
func isClosedErr(err error) bool {
if e, ok := err.(*net.OpError); ok {
if e.Err.Error() == "use of closed network connection" {
return true
}
}
return false
}
func currentTime() string {
layout := "2006/01/02-15:04:05.000000"
return time.Now().Format(layout)
}