480 lines
11 KiB
Go
480 lines
11 KiB
Go
// BSON library for Go
|
|
//
|
|
// Copyright (c) 2010-2012 - Gustavo Niemeyer <gustavo@niemeyer.net>
|
|
//
|
|
// All rights reserved.
|
|
//
|
|
// Redistribution and use in source and binary forms, with or without
|
|
// modification, are permitted provided that the following conditions are met:
|
|
//
|
|
// 1. Redistributions of source code must retain the above copyright notice, this
|
|
// list of conditions and the following disclaimer.
|
|
// 2. Redistributions in binary form must reproduce the above copyright notice,
|
|
// this list of conditions and the following disclaimer in the documentation
|
|
// and/or other materials provided with the distribution.
|
|
//
|
|
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
|
|
// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
|
|
// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
|
|
// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
|
|
// ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
|
|
// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
|
|
// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
|
|
// ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
|
|
// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
// gobson - BSON library for Go.
|
|
|
|
package bson
|
|
|
|
import (
|
|
"encoding/json"
|
|
"fmt"
|
|
"math"
|
|
"net/url"
|
|
"reflect"
|
|
"strconv"
|
|
"time"
|
|
)
|
|
|
|
// --------------------------------------------------------------------------
|
|
// Some internal infrastructure.
|
|
|
|
var (
|
|
typeBinary = reflect.TypeOf(Binary{})
|
|
typeObjectId = reflect.TypeOf(ObjectId(""))
|
|
typeSymbol = reflect.TypeOf(Symbol(""))
|
|
typeMongoTimestamp = reflect.TypeOf(MongoTimestamp(0))
|
|
typeOrderKey = reflect.TypeOf(MinKey)
|
|
typeDocElem = reflect.TypeOf(DocElem{})
|
|
typeRawDocElem = reflect.TypeOf(RawDocElem{})
|
|
typeRaw = reflect.TypeOf(Raw{})
|
|
typeURL = reflect.TypeOf(url.URL{})
|
|
typeTime = reflect.TypeOf(time.Time{})
|
|
typeString = reflect.TypeOf("")
|
|
typeJSONNumber = reflect.TypeOf(json.Number(""))
|
|
)
|
|
|
|
const itoaCacheSize = 32
|
|
|
|
var itoaCache []string
|
|
|
|
func init() {
|
|
itoaCache = make([]string, itoaCacheSize)
|
|
for i := 0; i != itoaCacheSize; i++ {
|
|
itoaCache[i] = strconv.Itoa(i)
|
|
}
|
|
}
|
|
|
|
func itoa(i int) string {
|
|
if i < itoaCacheSize {
|
|
return itoaCache[i]
|
|
}
|
|
return strconv.Itoa(i)
|
|
}
|
|
|
|
// --------------------------------------------------------------------------
|
|
// Marshaling of the document value itself.
|
|
|
|
type encoder struct {
|
|
out []byte
|
|
}
|
|
|
|
func (e *encoder) addDoc(v reflect.Value) {
|
|
for {
|
|
if vi, ok := v.Interface().(Getter); ok {
|
|
getv, err := vi.GetBSON()
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
v = reflect.ValueOf(getv)
|
|
continue
|
|
}
|
|
if v.Kind() == reflect.Ptr {
|
|
v = v.Elem()
|
|
continue
|
|
}
|
|
break
|
|
}
|
|
|
|
if v.Type() == typeRaw {
|
|
raw := v.Interface().(Raw)
|
|
if raw.Kind != 0x03 && raw.Kind != 0x00 {
|
|
panic("Attempted to unmarshal Raw kind " + strconv.Itoa(int(raw.Kind)) + " as a document")
|
|
}
|
|
e.addBytes(raw.Data...)
|
|
return
|
|
}
|
|
|
|
start := e.reserveInt32()
|
|
|
|
switch v.Kind() {
|
|
case reflect.Map:
|
|
e.addMap(v)
|
|
case reflect.Struct:
|
|
e.addStruct(v)
|
|
case reflect.Array, reflect.Slice:
|
|
e.addSlice(v)
|
|
default:
|
|
panic("Can't marshal " + v.Type().String() + " as a BSON document")
|
|
}
|
|
|
|
e.addBytes(0)
|
|
e.setInt32(start, int32(len(e.out)-start))
|
|
}
|
|
|
|
func (e *encoder) addMap(v reflect.Value) {
|
|
for _, k := range v.MapKeys() {
|
|
e.addElem(k.String(), v.MapIndex(k), false)
|
|
}
|
|
}
|
|
|
|
func (e *encoder) addStruct(v reflect.Value) {
|
|
sinfo, err := getStructInfo(v.Type())
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
var value reflect.Value
|
|
if sinfo.InlineMap >= 0 {
|
|
m := v.Field(sinfo.InlineMap)
|
|
if m.Len() > 0 {
|
|
for _, k := range m.MapKeys() {
|
|
ks := k.String()
|
|
if _, found := sinfo.FieldsMap[ks]; found {
|
|
panic(fmt.Sprintf("Can't have key %q in inlined map; conflicts with struct field", ks))
|
|
}
|
|
e.addElem(ks, m.MapIndex(k), false)
|
|
}
|
|
}
|
|
}
|
|
for _, info := range sinfo.FieldsList {
|
|
if info.Inline == nil {
|
|
value = v.Field(info.Num)
|
|
} else {
|
|
value = v.FieldByIndex(info.Inline)
|
|
}
|
|
if info.OmitEmpty && isZero(value) {
|
|
continue
|
|
}
|
|
e.addElem(info.Key, value, info.MinSize)
|
|
}
|
|
}
|
|
|
|
func isZero(v reflect.Value) bool {
|
|
switch v.Kind() {
|
|
case reflect.String:
|
|
return len(v.String()) == 0
|
|
case reflect.Ptr, reflect.Interface:
|
|
return v.IsNil()
|
|
case reflect.Slice:
|
|
return v.Len() == 0
|
|
case reflect.Map:
|
|
return v.Len() == 0
|
|
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
|
|
return v.Int() == 0
|
|
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
|
|
return v.Uint() == 0
|
|
case reflect.Float32, reflect.Float64:
|
|
return v.Float() == 0
|
|
case reflect.Bool:
|
|
return !v.Bool()
|
|
case reflect.Struct:
|
|
if v.Type() == typeTime {
|
|
return v.Interface().(time.Time).IsZero()
|
|
}
|
|
for i := v.NumField() - 1; i >= 0; i-- {
|
|
if !isZero(v.Field(i)) {
|
|
return false
|
|
}
|
|
}
|
|
return true
|
|
}
|
|
return false
|
|
}
|
|
|
|
func (e *encoder) addSlice(v reflect.Value) {
|
|
vi := v.Interface()
|
|
if d, ok := vi.(D); ok {
|
|
for _, elem := range d {
|
|
e.addElem(elem.Name, reflect.ValueOf(elem.Value), false)
|
|
}
|
|
return
|
|
}
|
|
if d, ok := vi.(RawD); ok {
|
|
for _, elem := range d {
|
|
e.addElem(elem.Name, reflect.ValueOf(elem.Value), false)
|
|
}
|
|
return
|
|
}
|
|
l := v.Len()
|
|
et := v.Type().Elem()
|
|
if et == typeDocElem {
|
|
for i := 0; i < l; i++ {
|
|
elem := v.Index(i).Interface().(DocElem)
|
|
e.addElem(elem.Name, reflect.ValueOf(elem.Value), false)
|
|
}
|
|
return
|
|
}
|
|
if et == typeRawDocElem {
|
|
for i := 0; i < l; i++ {
|
|
elem := v.Index(i).Interface().(RawDocElem)
|
|
e.addElem(elem.Name, reflect.ValueOf(elem.Value), false)
|
|
}
|
|
return
|
|
}
|
|
for i := 0; i < l; i++ {
|
|
e.addElem(itoa(i), v.Index(i), false)
|
|
}
|
|
}
|
|
|
|
// --------------------------------------------------------------------------
|
|
// Marshaling of elements in a document.
|
|
|
|
func (e *encoder) addElemName(kind byte, name string) {
|
|
e.addBytes(kind)
|
|
e.addBytes([]byte(name)...)
|
|
e.addBytes(0)
|
|
}
|
|
|
|
func (e *encoder) addElem(name string, v reflect.Value, minSize bool) {
|
|
|
|
if !v.IsValid() {
|
|
e.addElemName('\x0A', name)
|
|
return
|
|
}
|
|
|
|
if getter, ok := v.Interface().(Getter); ok {
|
|
getv, err := getter.GetBSON()
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
e.addElem(name, reflect.ValueOf(getv), minSize)
|
|
return
|
|
}
|
|
|
|
switch v.Kind() {
|
|
|
|
case reflect.Interface:
|
|
e.addElem(name, v.Elem(), minSize)
|
|
|
|
case reflect.Ptr:
|
|
e.addElem(name, v.Elem(), minSize)
|
|
|
|
case reflect.String:
|
|
s := v.String()
|
|
switch v.Type() {
|
|
case typeObjectId:
|
|
if len(s) != 12 {
|
|
panic("ObjectIDs must be exactly 12 bytes long (got " +
|
|
strconv.Itoa(len(s)) + ")")
|
|
}
|
|
e.addElemName('\x07', name)
|
|
e.addBytes([]byte(s)...)
|
|
case typeSymbol:
|
|
e.addElemName('\x0E', name)
|
|
e.addStr(s)
|
|
case typeJSONNumber:
|
|
n := v.Interface().(json.Number)
|
|
if i, err := n.Int64(); err == nil {
|
|
e.addElemName('\x12', name)
|
|
e.addInt64(i)
|
|
} else if f, err := n.Float64(); err == nil {
|
|
e.addElemName('\x01', name)
|
|
e.addFloat64(f)
|
|
} else {
|
|
panic("failed to convert json.Number to a number: " + s)
|
|
}
|
|
default:
|
|
e.addElemName('\x02', name)
|
|
e.addStr(s)
|
|
}
|
|
|
|
case reflect.Float32, reflect.Float64:
|
|
e.addElemName('\x01', name)
|
|
e.addFloat64(v.Float())
|
|
|
|
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
|
|
u := v.Uint()
|
|
if int64(u) < 0 {
|
|
panic("BSON has no uint64 type, and value is too large to fit correctly in an int64")
|
|
} else if u <= math.MaxInt32 && (minSize || v.Kind() <= reflect.Uint32) {
|
|
e.addElemName('\x10', name)
|
|
e.addInt32(int32(u))
|
|
} else {
|
|
e.addElemName('\x12', name)
|
|
e.addInt64(int64(u))
|
|
}
|
|
|
|
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
|
|
switch v.Type() {
|
|
case typeMongoTimestamp:
|
|
e.addElemName('\x11', name)
|
|
e.addInt64(v.Int())
|
|
|
|
case typeOrderKey:
|
|
if v.Int() == int64(MaxKey) {
|
|
e.addElemName('\x7F', name)
|
|
} else {
|
|
e.addElemName('\xFF', name)
|
|
}
|
|
|
|
default:
|
|
i := v.Int()
|
|
if (minSize || v.Type().Kind() != reflect.Int64) && i >= math.MinInt32 && i <= math.MaxInt32 {
|
|
// It fits into an int32, encode as such.
|
|
e.addElemName('\x10', name)
|
|
e.addInt32(int32(i))
|
|
} else {
|
|
e.addElemName('\x12', name)
|
|
e.addInt64(i)
|
|
}
|
|
}
|
|
|
|
case reflect.Bool:
|
|
e.addElemName('\x08', name)
|
|
if v.Bool() {
|
|
e.addBytes(1)
|
|
} else {
|
|
e.addBytes(0)
|
|
}
|
|
|
|
case reflect.Map:
|
|
e.addElemName('\x03', name)
|
|
e.addDoc(v)
|
|
|
|
case reflect.Slice:
|
|
vt := v.Type()
|
|
et := vt.Elem()
|
|
if et.Kind() == reflect.Uint8 {
|
|
e.addElemName('\x05', name)
|
|
e.addBinary('\x00', v.Bytes())
|
|
} else if et == typeDocElem || et == typeRawDocElem {
|
|
e.addElemName('\x03', name)
|
|
e.addDoc(v)
|
|
} else {
|
|
e.addElemName('\x04', name)
|
|
e.addDoc(v)
|
|
}
|
|
|
|
case reflect.Array:
|
|
et := v.Type().Elem()
|
|
if et.Kind() == reflect.Uint8 {
|
|
e.addElemName('\x05', name)
|
|
e.addBinary('\x00', v.Slice(0, v.Len()).Interface().([]byte))
|
|
} else {
|
|
e.addElemName('\x04', name)
|
|
e.addDoc(v)
|
|
}
|
|
|
|
case reflect.Struct:
|
|
switch s := v.Interface().(type) {
|
|
|
|
case Raw:
|
|
kind := s.Kind
|
|
if kind == 0x00 {
|
|
kind = 0x03
|
|
}
|
|
e.addElemName(kind, name)
|
|
e.addBytes(s.Data...)
|
|
|
|
case Binary:
|
|
e.addElemName('\x05', name)
|
|
e.addBinary(s.Kind, s.Data)
|
|
|
|
case RegEx:
|
|
e.addElemName('\x0B', name)
|
|
e.addCStr(s.Pattern)
|
|
e.addCStr(s.Options)
|
|
|
|
case JavaScript:
|
|
if s.Scope == nil {
|
|
e.addElemName('\x0D', name)
|
|
e.addStr(s.Code)
|
|
} else {
|
|
e.addElemName('\x0F', name)
|
|
start := e.reserveInt32()
|
|
e.addStr(s.Code)
|
|
e.addDoc(reflect.ValueOf(s.Scope))
|
|
e.setInt32(start, int32(len(e.out)-start))
|
|
}
|
|
|
|
case time.Time:
|
|
// MongoDB handles timestamps as milliseconds.
|
|
e.addElemName('\x09', name)
|
|
e.addInt64(s.Unix()*1000 + int64(s.Nanosecond()/1e6))
|
|
|
|
case url.URL:
|
|
e.addElemName('\x02', name)
|
|
e.addStr(s.String())
|
|
|
|
case undefined:
|
|
e.addElemName('\x06', name)
|
|
|
|
default:
|
|
e.addElemName('\x03', name)
|
|
e.addDoc(v)
|
|
}
|
|
|
|
default:
|
|
panic("Can't marshal " + v.Type().String() + " in a BSON document")
|
|
}
|
|
}
|
|
|
|
// --------------------------------------------------------------------------
|
|
// Marshaling of base types.
|
|
|
|
func (e *encoder) addBinary(subtype byte, v []byte) {
|
|
if subtype == 0x02 {
|
|
// Wonder how that brilliant idea came to life. Obsolete, luckily.
|
|
e.addInt32(int32(len(v) + 4))
|
|
e.addBytes(subtype)
|
|
e.addInt32(int32(len(v)))
|
|
} else {
|
|
e.addInt32(int32(len(v)))
|
|
e.addBytes(subtype)
|
|
}
|
|
e.addBytes(v...)
|
|
}
|
|
|
|
func (e *encoder) addStr(v string) {
|
|
e.addInt32(int32(len(v) + 1))
|
|
e.addCStr(v)
|
|
}
|
|
|
|
func (e *encoder) addCStr(v string) {
|
|
e.addBytes([]byte(v)...)
|
|
e.addBytes(0)
|
|
}
|
|
|
|
func (e *encoder) reserveInt32() (pos int) {
|
|
pos = len(e.out)
|
|
e.addBytes(0, 0, 0, 0)
|
|
return pos
|
|
}
|
|
|
|
func (e *encoder) setInt32(pos int, v int32) {
|
|
e.out[pos+0] = byte(v)
|
|
e.out[pos+1] = byte(v >> 8)
|
|
e.out[pos+2] = byte(v >> 16)
|
|
e.out[pos+3] = byte(v >> 24)
|
|
}
|
|
|
|
func (e *encoder) addInt32(v int32) {
|
|
u := uint32(v)
|
|
e.addBytes(byte(u), byte(u>>8), byte(u>>16), byte(u>>24))
|
|
}
|
|
|
|
func (e *encoder) addInt64(v int64) {
|
|
u := uint64(v)
|
|
e.addBytes(byte(u), byte(u>>8), byte(u>>16), byte(u>>24),
|
|
byte(u>>32), byte(u>>40), byte(u>>48), byte(u>>56))
|
|
}
|
|
|
|
func (e *encoder) addFloat64(v float64) {
|
|
e.addInt64(int64(math.Float64bits(v)))
|
|
}
|
|
|
|
func (e *encoder) addBytes(v ...byte) {
|
|
e.out = append(e.out, v...)
|
|
}
|