/
parser_util.go
136 lines (121 loc) · 2.31 KB
/
parser_util.go
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// from https://raw.githubusercontent.com/ma6174/mgosniff/cf913f17c2f681392231629e4c29d90b990a6d2d/utils.go
package mongowire
import (
"encoding/binary"
"io"
jsoniter "github.com/json-iterator/go"
"go.mongodb.org/mongo-driver/bson"
"github.com/wish/mongoproxy/pkg/ioutil"
)
func MustReadUInt8(r io.Reader) (n uint8) {
err := binary.Read(r, binary.LittleEndian, &n)
if err != nil {
panic(err)
}
return
}
func MustReadUInt32(r io.Reader) (n uint32) {
err := binary.Read(r, binary.LittleEndian, &n)
if err != nil {
panic(err)
}
return
}
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 MustReadInt64(r io.Reader) (n int64) {
err := binary.Read(r, binary.LittleEndian, &n)
if err != nil {
panic(err)
}
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.D) {
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.D) {
for {
m := ReadDocument(r)
if m == nil {
break
}
ms = append(ms, m)
}
return
}
func ToJson(v interface{}, l int) string {
w := ioutil.NewLimitedWriter(make([]byte, l))
jsoniter.NewEncoder(w).Encode(v)
return string(w.Get())
}
func hasBit(n int32, pos uint) bool {
val := n & (1 << pos)
return (val > 0)
}