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Timo Reimann 2017-02-07 22:33:23 +01:00
parent 49a09ab7dd
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25
vendor/gopkg.in/mgo.v2/bson/LICENSE generated vendored Normal file
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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.

721
vendor/gopkg.in/mgo.v2/bson/bson.go generated vendored Normal file
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// 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.
// Package bson is an implementation of the BSON specification for Go:
//
// http://bsonspec.org
//
// It was created as part of the mgo MongoDB driver for Go, but is standalone
// and may be used on its own without the driver.
package bson
import (
"bytes"
"crypto/md5"
"crypto/rand"
"encoding/binary"
"encoding/hex"
"errors"
"fmt"
"io"
"os"
"reflect"
"runtime"
"strings"
"sync"
"sync/atomic"
"time"
)
// --------------------------------------------------------------------------
// The public API.
// A value implementing the bson.Getter interface will have its GetBSON
// method called when the given value has to be marshalled, and the result
// of this method will be marshaled in place of the actual object.
//
// If GetBSON returns return a non-nil error, the marshalling procedure
// will stop and error out with the provided value.
type Getter interface {
GetBSON() (interface{}, error)
}
// A value implementing the bson.Setter interface will receive the BSON
// value via the SetBSON method during unmarshaling, and the object
// itself will not be changed as usual.
//
// If setting the value works, the method should return nil or alternatively
// bson.SetZero to set the respective field to its zero value (nil for
// pointer types). If SetBSON returns a value of type bson.TypeError, the
// BSON value will be omitted from a map or slice being decoded and the
// unmarshalling will continue. If it returns any other non-nil error, the
// unmarshalling procedure will stop and error out with the provided value.
//
// This interface is generally useful in pointer receivers, since the method
// will want to change the receiver. A type field that implements the Setter
// interface doesn't have to be a pointer, though.
//
// Unlike the usual behavior, unmarshalling onto a value that implements a
// Setter interface will NOT reset the value to its zero state. This allows
// the value to decide by itself how to be unmarshalled.
//
// For example:
//
// type MyString string
//
// func (s *MyString) SetBSON(raw bson.Raw) error {
// return raw.Unmarshal(s)
// }
//
type Setter interface {
SetBSON(raw Raw) error
}
// SetZero may be returned from a SetBSON method to have the value set to
// its respective zero value. When used in pointer values, this will set the
// field to nil rather than to the pre-allocated value.
var SetZero = errors.New("set to zero")
// M is a convenient alias for a map[string]interface{} map, useful for
// dealing with BSON in a native way. For instance:
//
// bson.M{"a": 1, "b": true}
//
// There's no special handling for this type in addition to what's done anyway
// for an equivalent map type. Elements in the map will be dumped in an
// undefined ordered. See also the bson.D type for an ordered alternative.
type M map[string]interface{}
// D represents a BSON document containing ordered elements. For example:
//
// bson.D{{"a", 1}, {"b", true}}
//
// In some situations, such as when creating indexes for MongoDB, the order in
// which the elements are defined is important. If the order is not important,
// using a map is generally more comfortable. See bson.M and bson.RawD.
type D []DocElem
// DocElem is an element of the bson.D document representation.
type DocElem struct {
Name string
Value interface{}
}
// Map returns a map out of the ordered element name/value pairs in d.
func (d D) Map() (m M) {
m = make(M, len(d))
for _, item := range d {
m[item.Name] = item.Value
}
return m
}
// The Raw type represents raw unprocessed BSON documents and elements.
// Kind is the kind of element as defined per the BSON specification, and
// Data is the raw unprocessed data for the respective element.
// Using this type it is possible to unmarshal or marshal values partially.
//
// Relevant documentation:
//
// http://bsonspec.org/#/specification
//
type Raw struct {
Kind byte
Data []byte
}
// RawD represents a BSON document containing raw unprocessed elements.
// This low-level representation may be useful when lazily processing
// documents of uncertain content, or when manipulating the raw content
// documents in general.
type RawD []RawDocElem
// See the RawD type.
type RawDocElem struct {
Name string
Value Raw
}
// ObjectId is a unique ID identifying a BSON value. It must be exactly 12 bytes
// long. MongoDB objects by default have such a property set in their "_id"
// property.
//
// http://www.mongodb.org/display/DOCS/Object+IDs
type ObjectId string
// ObjectIdHex returns an ObjectId from the provided hex representation.
// Calling this function with an invalid hex representation will
// cause a runtime panic. See the IsObjectIdHex function.
func ObjectIdHex(s string) ObjectId {
d, err := hex.DecodeString(s)
if err != nil || len(d) != 12 {
panic(fmt.Sprintf("invalid input to ObjectIdHex: %q", s))
}
return ObjectId(d)
}
// IsObjectIdHex returns whether s is a valid hex representation of
// an ObjectId. See the ObjectIdHex function.
func IsObjectIdHex(s string) bool {
if len(s) != 24 {
return false
}
_, err := hex.DecodeString(s)
return err == nil
}
// objectIdCounter is atomically incremented when generating a new ObjectId
// using NewObjectId() function. It's used as a counter part of an id.
var objectIdCounter uint32 = readRandomUint32()
// readRandomUint32 returns a random objectIdCounter.
func readRandomUint32() uint32 {
var b [4]byte
_, err := io.ReadFull(rand.Reader, b[:])
if err != nil {
panic(fmt.Errorf("cannot read random object id: %v", err))
}
return uint32((uint32(b[0]) << 0) | (uint32(b[1]) << 8) | (uint32(b[2]) << 16) | (uint32(b[3]) << 24))
}
// machineId stores machine id generated once and used in subsequent calls
// to NewObjectId function.
var machineId = readMachineId()
// readMachineId generates and returns a machine id.
// If this function fails to get the hostname it will cause a runtime error.
func readMachineId() []byte {
var sum [3]byte
id := sum[:]
hostname, err1 := os.Hostname()
if err1 != nil {
_, err2 := io.ReadFull(rand.Reader, id)
if err2 != nil {
panic(fmt.Errorf("cannot get hostname: %v; %v", err1, err2))
}
return id
}
hw := md5.New()
hw.Write([]byte(hostname))
copy(id, hw.Sum(nil))
return id
}
// NewObjectId returns a new unique ObjectId.
func NewObjectId() ObjectId {
var b [12]byte
// Timestamp, 4 bytes, big endian
binary.BigEndian.PutUint32(b[:], uint32(time.Now().Unix()))
// Machine, first 3 bytes of md5(hostname)
b[4] = machineId[0]
b[5] = machineId[1]
b[6] = machineId[2]
// Pid, 2 bytes, specs don't specify endianness, but we use big endian.
pid := os.Getpid()
b[7] = byte(pid >> 8)
b[8] = byte(pid)
// Increment, 3 bytes, big endian
i := atomic.AddUint32(&objectIdCounter, 1)
b[9] = byte(i >> 16)
b[10] = byte(i >> 8)
b[11] = byte(i)
return ObjectId(b[:])
}
// NewObjectIdWithTime returns a dummy ObjectId with the timestamp part filled
// with the provided number of seconds from epoch UTC, and all other parts
// filled with zeroes. It's not safe to insert a document with an id generated
// by this method, it is useful only for queries to find documents with ids
// generated before or after the specified timestamp.
func NewObjectIdWithTime(t time.Time) ObjectId {
var b [12]byte
binary.BigEndian.PutUint32(b[:4], uint32(t.Unix()))
return ObjectId(string(b[:]))
}
// String returns a hex string representation of the id.
// Example: ObjectIdHex("4d88e15b60f486e428412dc9").
func (id ObjectId) String() string {
return fmt.Sprintf(`ObjectIdHex("%x")`, string(id))
}
// Hex returns a hex representation of the ObjectId.
func (id ObjectId) Hex() string {
return hex.EncodeToString([]byte(id))
}
// MarshalJSON turns a bson.ObjectId into a json.Marshaller.
func (id ObjectId) MarshalJSON() ([]byte, error) {
return []byte(fmt.Sprintf(`"%x"`, string(id))), nil
}
var nullBytes = []byte("null")
// UnmarshalJSON turns *bson.ObjectId into a json.Unmarshaller.
func (id *ObjectId) UnmarshalJSON(data []byte) error {
if len(data) == 2 && data[0] == '"' && data[1] == '"' || bytes.Equal(data, nullBytes) {
*id = ""
return nil
}
if len(data) != 26 || data[0] != '"' || data[25] != '"' {
return errors.New(fmt.Sprintf("invalid ObjectId in JSON: %s", string(data)))
}
var buf [12]byte
_, err := hex.Decode(buf[:], data[1:25])
if err != nil {
return errors.New(fmt.Sprintf("invalid ObjectId in JSON: %s (%s)", string(data), err))
}
*id = ObjectId(string(buf[:]))
return nil
}
// MarshalText turns bson.ObjectId into an encoding.TextMarshaler.
func (id ObjectId) MarshalText() ([]byte, error) {
return []byte(fmt.Sprintf("%x", string(id))), nil
}
// UnmarshalText turns *bson.ObjectId into an encoding.TextUnmarshaler.
func (id *ObjectId) UnmarshalText(data []byte) error {
if len(data) == 1 && data[0] == ' ' || len(data) == 0 {
*id = ""
return nil
}
if len(data) != 24 {
return fmt.Errorf("invalid ObjectId: %s", data)
}
var buf [12]byte
_, err := hex.Decode(buf[:], data[:])
if err != nil {
return fmt.Errorf("invalid ObjectId: %s (%s)", data, err)
}
*id = ObjectId(string(buf[:]))
return nil
}
// Valid returns true if id is valid. A valid id must contain exactly 12 bytes.
func (id ObjectId) Valid() bool {
return len(id) == 12
}
// byteSlice returns byte slice of id from start to end.
// Calling this function with an invalid id will cause a runtime panic.
func (id ObjectId) byteSlice(start, end int) []byte {
if len(id) != 12 {
panic(fmt.Sprintf("invalid ObjectId: %q", string(id)))
}
return []byte(string(id)[start:end])
}
// Time returns the timestamp part of the id.
// It's a runtime error to call this method with an invalid id.
func (id ObjectId) Time() time.Time {
// First 4 bytes of ObjectId is 32-bit big-endian seconds from epoch.
secs := int64(binary.BigEndian.Uint32(id.byteSlice(0, 4)))
return time.Unix(secs, 0)
}
// Machine returns the 3-byte machine id part of the id.
// It's a runtime error to call this method with an invalid id.
func (id ObjectId) Machine() []byte {
return id.byteSlice(4, 7)
}
// Pid returns the process id part of the id.
// It's a runtime error to call this method with an invalid id.
func (id ObjectId) Pid() uint16 {
return binary.BigEndian.Uint16(id.byteSlice(7, 9))
}
// Counter returns the incrementing value part of the id.
// It's a runtime error to call this method with an invalid id.
func (id ObjectId) Counter() int32 {
b := id.byteSlice(9, 12)
// Counter is stored as big-endian 3-byte value
return int32(uint32(b[0])<<16 | uint32(b[1])<<8 | uint32(b[2]))
}
// The Symbol type is similar to a string and is used in languages with a
// distinct symbol type.
type Symbol string
// Now returns the current time with millisecond precision. MongoDB stores
// timestamps with the same precision, so a Time returned from this method
// will not change after a roundtrip to the database. That's the only reason
// why this function exists. Using the time.Now function also works fine
// otherwise.
func Now() time.Time {
return time.Unix(0, time.Now().UnixNano()/1e6*1e6)
}
// MongoTimestamp is a special internal type used by MongoDB that for some
// strange reason has its own datatype defined in BSON.
type MongoTimestamp int64
type orderKey int64
// MaxKey is a special value that compares higher than all other possible BSON
// values in a MongoDB database.
var MaxKey = orderKey(1<<63 - 1)
// MinKey is a special value that compares lower than all other possible BSON
// values in a MongoDB database.
var MinKey = orderKey(-1 << 63)
type undefined struct{}
// Undefined represents the undefined BSON value.
var Undefined undefined
// Binary is a representation for non-standard binary values. Any kind should
// work, but the following are known as of this writing:
//
// 0x00 - Generic. This is decoded as []byte(data), not Binary{0x00, data}.
// 0x01 - Function (!?)
// 0x02 - Obsolete generic.
// 0x03 - UUID
// 0x05 - MD5
// 0x80 - User defined.
//
type Binary struct {
Kind byte
Data []byte
}
// RegEx represents a regular expression. The Options field may contain
// individual characters defining the way in which the pattern should be
// applied, and must be sorted. Valid options as of this writing are 'i' for
// case insensitive matching, 'm' for multi-line matching, 'x' for verbose
// mode, 'l' to make \w, \W, and similar be locale-dependent, 's' for dot-all
// mode (a '.' matches everything), and 'u' to make \w, \W, and similar match
// unicode. The value of the Options parameter is not verified before being
// marshaled into the BSON format.
type RegEx struct {
Pattern string
Options string
}
// JavaScript is a type that holds JavaScript code. If Scope is non-nil, it
// will be marshaled as a mapping from identifiers to values that may be
// used when evaluating the provided Code.
type JavaScript struct {
Code string
Scope interface{}
}
// DBPointer refers to a document id in a namespace.
//
// This type is deprecated in the BSON specification and should not be used
// except for backwards compatibility with ancient applications.
type DBPointer struct {
Namespace string
Id ObjectId
}
const initialBufferSize = 64
func handleErr(err *error) {
if r := recover(); r != nil {
if _, ok := r.(runtime.Error); ok {
panic(r)
} else if _, ok := r.(externalPanic); ok {
panic(r)
} else if s, ok := r.(string); ok {
*err = errors.New(s)
} else if e, ok := r.(error); ok {
*err = e
} else {
panic(r)
}
}
}
// Marshal serializes the in value, which may be a map or a struct value.
// In the case of struct values, only exported fields will be serialized,
// and the order of serialized fields will match that of the struct itself.
// The lowercased field name is used as the key for each exported field,
// but this behavior may be changed using the respective field tag.
// The tag may also contain flags to tweak the marshalling behavior for
// the field. The tag formats accepted are:
//
// "[<key>][,<flag1>[,<flag2>]]"
//
// `(...) bson:"[<key>][,<flag1>[,<flag2>]]" (...)`
//
// The following flags are currently supported:
//
// omitempty Only include the field if it's not set to the zero
// value for the type or to empty slices or maps.
//
// minsize Marshal an int64 value as an int32, if that's feasible
// while preserving the numeric value.
//
// inline Inline the field, which must be a struct or a map,
// causing all of its fields or keys to be processed as if
// they were part of the outer struct. For maps, keys must
// not conflict with the bson keys of other struct fields.
//
// Some examples:
//
// type T struct {
// A bool
// B int "myb"
// C string "myc,omitempty"
// D string `bson:",omitempty" json:"jsonkey"`
// E int64 ",minsize"
// F int64 "myf,omitempty,minsize"
// }
//
func Marshal(in interface{}) (out []byte, err error) {
defer handleErr(&err)
e := &encoder{make([]byte, 0, initialBufferSize)}
e.addDoc(reflect.ValueOf(in))
return e.out, nil
}
// Unmarshal deserializes data from in into the out value. The out value
// must be a map, a pointer to a struct, or a pointer to a bson.D value.
// In the case of struct values, only exported fields will be deserialized.
// The lowercased field name is used as the key for each exported field,
// but this behavior may be changed using the respective field tag.
// The tag may also contain flags to tweak the marshalling behavior for
// the field. The tag formats accepted are:
//
// "[<key>][,<flag1>[,<flag2>]]"
//
// `(...) bson:"[<key>][,<flag1>[,<flag2>]]" (...)`
//
// The following flags are currently supported during unmarshal (see the
// Marshal method for other flags):
//
// inline Inline the field, which must be a struct or a map.
// Inlined structs are handled as if its fields were part
// of the outer struct. An inlined map causes keys that do
// not match any other struct field to be inserted in the
// map rather than being discarded as usual.
//
// The target field or element types of out may not necessarily match
// the BSON values of the provided data. The following conversions are
// made automatically:
//
// - Numeric types are converted if at least the integer part of the
// value would be preserved correctly
// - Bools are converted to numeric types as 1 or 0
// - Numeric types are converted to bools as true if not 0 or false otherwise
// - Binary and string BSON data is converted to a string, array or byte slice
//
// If the value would not fit the type and cannot be converted, it's
// silently skipped.
//
// Pointer values are initialized when necessary.
func Unmarshal(in []byte, out interface{}) (err error) {
if raw, ok := out.(*Raw); ok {
raw.Kind = 3
raw.Data = in
return nil
}
defer handleErr(&err)
v := reflect.ValueOf(out)
switch v.Kind() {
case reflect.Ptr:
fallthrough
case reflect.Map:
d := newDecoder(in)
d.readDocTo(v)
case reflect.Struct:
return errors.New("Unmarshal can't deal with struct values. Use a pointer.")
default:
return errors.New("Unmarshal needs a map or a pointer to a struct.")
}
return nil
}
// Unmarshal deserializes raw into the out value. If the out value type
// is not compatible with raw, a *bson.TypeError is returned.
//
// See the Unmarshal function documentation for more details on the
// unmarshalling process.
func (raw Raw) Unmarshal(out interface{}) (err error) {
defer handleErr(&err)
v := reflect.ValueOf(out)
switch v.Kind() {
case reflect.Ptr:
v = v.Elem()
fallthrough
case reflect.Map:
d := newDecoder(raw.Data)
good := d.readElemTo(v, raw.Kind)
if !good {
return &TypeError{v.Type(), raw.Kind}
}
case reflect.Struct:
return errors.New("Raw Unmarshal can't deal with struct values. Use a pointer.")
default:
return errors.New("Raw Unmarshal needs a map or a valid pointer.")
}
return nil
}
type TypeError struct {
Type reflect.Type
Kind byte
}
func (e *TypeError) Error() string {
return fmt.Sprintf("BSON kind 0x%02x isn't compatible with type %s", e.Kind, e.Type.String())
}
// --------------------------------------------------------------------------
// Maintain a mapping of keys to structure field indexes
type structInfo struct {
FieldsMap map[string]fieldInfo
FieldsList []fieldInfo
InlineMap int
Zero reflect.Value
}
type fieldInfo struct {
Key string
Num int
OmitEmpty bool
MinSize bool
Inline []int
}
var structMap = make(map[reflect.Type]*structInfo)
var structMapMutex sync.RWMutex
type externalPanic string
func (e externalPanic) String() string {
return string(e)
}
func getStructInfo(st reflect.Type) (*structInfo, error) {
structMapMutex.RLock()
sinfo, found := structMap[st]
structMapMutex.RUnlock()
if found {
return sinfo, nil
}
n := st.NumField()
fieldsMap := make(map[string]fieldInfo)
fieldsList := make([]fieldInfo, 0, n)
inlineMap := -1
for i := 0; i != n; i++ {
field := st.Field(i)
if field.PkgPath != "" && !field.Anonymous {
continue // Private field
}
info := fieldInfo{Num: i}
tag := field.Tag.Get("bson")
if tag == "" && strings.Index(string(field.Tag), ":") < 0 {
tag = string(field.Tag)
}
if tag == "-" {
continue
}
inline := false
fields := strings.Split(tag, ",")
if len(fields) > 1 {
for _, flag := range fields[1:] {
switch flag {
case "omitempty":
info.OmitEmpty = true
case "minsize":
info.MinSize = true
case "inline":
inline = true
default:
msg := fmt.Sprintf("Unsupported flag %q in tag %q of type %s", flag, tag, st)
panic(externalPanic(msg))
}
}
tag = fields[0]
}
if inline {
switch field.Type.Kind() {
case reflect.Map:
if inlineMap >= 0 {
return nil, errors.New("Multiple ,inline maps in struct " + st.String())
}
if field.Type.Key() != reflect.TypeOf("") {
return nil, errors.New("Option ,inline needs a map with string keys in struct " + st.String())
}
inlineMap = info.Num
case reflect.Struct:
sinfo, err := getStructInfo(field.Type)
if err != nil {
return nil, err
}
for _, finfo := range sinfo.FieldsList {
if _, found := fieldsMap[finfo.Key]; found {
msg := "Duplicated key '" + finfo.Key + "' in struct " + st.String()
return nil, errors.New(msg)
}
if finfo.Inline == nil {
finfo.Inline = []int{i, finfo.Num}
} else {
finfo.Inline = append([]int{i}, finfo.Inline...)
}
fieldsMap[finfo.Key] = finfo
fieldsList = append(fieldsList, finfo)
}
default:
panic("Option ,inline needs a struct value or map field")
}
continue
}
if tag != "" {
info.Key = tag
} else {
info.Key = strings.ToLower(field.Name)
}
if _, found = fieldsMap[info.Key]; found {
msg := "Duplicated key '" + info.Key + "' in struct " + st.String()
return nil, errors.New(msg)
}
fieldsList = append(fieldsList, info)
fieldsMap[info.Key] = info
}
sinfo = &structInfo{
fieldsMap,
fieldsList,
inlineMap,
reflect.New(st).Elem(),
}
structMapMutex.Lock()
structMap[st] = sinfo
structMapMutex.Unlock()
return sinfo, nil
}

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vendor/gopkg.in/mgo.v2/bson/decode.go generated vendored Normal file
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// 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 (
"fmt"
"math"
"net/url"
"reflect"
"strconv"
"sync"
"time"
)
type decoder struct {
in []byte
i int
docType reflect.Type
}
var typeM = reflect.TypeOf(M{})
func newDecoder(in []byte) *decoder {
return &decoder{in, 0, typeM}
}
// --------------------------------------------------------------------------
// Some helper functions.
func corrupted() {
panic("Document is corrupted")
}
func settableValueOf(i interface{}) reflect.Value {
v := reflect.ValueOf(i)
sv := reflect.New(v.Type()).Elem()
sv.Set(v)
return sv
}
// --------------------------------------------------------------------------
// Unmarshaling of documents.
const (
setterUnknown = iota
setterNone
setterType
setterAddr
)
var setterStyles map[reflect.Type]int
var setterIface reflect.Type
var setterMutex sync.RWMutex
func init() {
var iface Setter
setterIface = reflect.TypeOf(&iface).Elem()
setterStyles = make(map[reflect.Type]int)
}
func setterStyle(outt reflect.Type) int {
setterMutex.RLock()
style := setterStyles[outt]
setterMutex.RUnlock()
if style == setterUnknown {
setterMutex.Lock()
defer setterMutex.Unlock()
if outt.Implements(setterIface) {
setterStyles[outt] = setterType
} else if reflect.PtrTo(outt).Implements(setterIface) {
setterStyles[outt] = setterAddr
} else {
setterStyles[outt] = setterNone
}
style = setterStyles[outt]
}
return style
}
func getSetter(outt reflect.Type, out reflect.Value) Setter {
style := setterStyle(outt)
if style == setterNone {
return nil
}
if style == setterAddr {
if !out.CanAddr() {
return nil
}
out = out.Addr()
} else if outt.Kind() == reflect.Ptr && out.IsNil() {
out.Set(reflect.New(outt.Elem()))
}
return out.Interface().(Setter)
}
func clearMap(m reflect.Value) {
var none reflect.Value
for _, k := range m.MapKeys() {
m.SetMapIndex(k, none)
}
}
func (d *decoder) readDocTo(out reflect.Value) {
var elemType reflect.Type
outt := out.Type()
outk := outt.Kind()
for {
if outk == reflect.Ptr && out.IsNil() {
out.Set(reflect.New(outt.Elem()))
}
if setter := getSetter(outt, out); setter != nil {
var raw Raw
d.readDocTo(reflect.ValueOf(&raw))
err := setter.SetBSON(raw)
if _, ok := err.(*TypeError); err != nil && !ok {
panic(err)
}
return
}
if outk == reflect.Ptr {
out = out.Elem()
outt = out.Type()
outk = out.Kind()
continue
}
break
}
var fieldsMap map[string]fieldInfo
var inlineMap reflect.Value
start := d.i
origout := out
if outk == reflect.Interface {
if d.docType.Kind() == reflect.Map {
mv := reflect.MakeMap(d.docType)
out.Set(mv)
out = mv
} else {
dv := reflect.New(d.docType).Elem()
out.Set(dv)
out = dv
}
outt = out.Type()
outk = outt.Kind()
}
docType := d.docType
keyType := typeString
convertKey := false
switch outk {
case reflect.Map:
keyType = outt.Key()
if keyType.Kind() != reflect.String {
panic("BSON map must have string keys. Got: " + outt.String())
}
if keyType != typeString {
convertKey = true
}
elemType = outt.Elem()
if elemType == typeIface {
d.docType = outt
}
if out.IsNil() {
out.Set(reflect.MakeMap(out.Type()))
} else if out.Len() > 0 {
clearMap(out)
}
case reflect.Struct:
if outt != typeRaw {
sinfo, err := getStructInfo(out.Type())
if err != nil {
panic(err)
}
fieldsMap = sinfo.FieldsMap
out.Set(sinfo.Zero)
if sinfo.InlineMap != -1 {
inlineMap = out.Field(sinfo.InlineMap)
if !inlineMap.IsNil() && inlineMap.Len() > 0 {
clearMap(inlineMap)
}
elemType = inlineMap.Type().Elem()
if elemType == typeIface {
d.docType = inlineMap.Type()
}
}
}
case reflect.Slice:
switch outt.Elem() {
case typeDocElem:
origout.Set(d.readDocElems(outt))
return
case typeRawDocElem:
origout.Set(d.readRawDocElems(outt))
return
}
fallthrough
default:
panic("Unsupported document type for unmarshalling: " + out.Type().String())
}
end := int(d.readInt32())
end += d.i - 4
if end <= d.i || end > len(d.in) || d.in[end-1] != '\x00' {
corrupted()
}
for d.in[d.i] != '\x00' {
kind := d.readByte()
name := d.readCStr()
if d.i >= end {
corrupted()
}
switch outk {
case reflect.Map:
e := reflect.New(elemType).Elem()
if d.readElemTo(e, kind) {
k := reflect.ValueOf(name)
if convertKey {
k = k.Convert(keyType)
}
out.SetMapIndex(k, e)
}
case reflect.Struct:
if outt == typeRaw {
d.dropElem(kind)
} else {
if info, ok := fieldsMap[name]; ok {
if info.Inline == nil {
d.readElemTo(out.Field(info.Num), kind)
} else {
d.readElemTo(out.FieldByIndex(info.Inline), kind)
}
} else if inlineMap.IsValid() {
if inlineMap.IsNil() {
inlineMap.Set(reflect.MakeMap(inlineMap.Type()))
}
e := reflect.New(elemType).Elem()
if d.readElemTo(e, kind) {
inlineMap.SetMapIndex(reflect.ValueOf(name), e)
}
} else {
d.dropElem(kind)
}
}
case reflect.Slice:
}
if d.i >= end {
corrupted()
}
}
d.i++ // '\x00'
if d.i != end {
corrupted()
}
d.docType = docType
if outt == typeRaw {
out.Set(reflect.ValueOf(Raw{0x03, d.in[start:d.i]}))
}
}
func (d *decoder) readArrayDocTo(out reflect.Value) {
end := int(d.readInt32())
end += d.i - 4
if end <= d.i || end > len(d.in) || d.in[end-1] != '\x00' {
corrupted()
}
i := 0
l := out.Len()
for d.in[d.i] != '\x00' {
if i >= l {
panic("Length mismatch on array field")
}
kind := d.readByte()
for d.i < end && d.in[d.i] != '\x00' {
d.i++
}
if d.i >= end {
corrupted()
}
d.i++
d.readElemTo(out.Index(i), kind)
if d.i >= end {
corrupted()
}
i++
}
if i != l {
panic("Length mismatch on array field")
}
d.i++ // '\x00'
if d.i != end {
corrupted()
}
}
func (d *decoder) readSliceDoc(t reflect.Type) interface{} {
tmp := make([]reflect.Value, 0, 8)
elemType := t.Elem()
if elemType == typeRawDocElem {
d.dropElem(0x04)
return reflect.Zero(t).Interface()
}
end := int(d.readInt32())
end += d.i - 4
if end <= d.i || end > len(d.in) || d.in[end-1] != '\x00' {
corrupted()
}
for d.in[d.i] != '\x00' {
kind := d.readByte()
for d.i < end && d.in[d.i] != '\x00' {
d.i++
}
if d.i >= end {
corrupted()
}
d.i++
e := reflect.New(elemType).Elem()
if d.readElemTo(e, kind) {
tmp = append(tmp, e)
}
if d.i >= end {
corrupted()
}
}
d.i++ // '\x00'
if d.i != end {
corrupted()
}
n := len(tmp)
slice := reflect.MakeSlice(t, n, n)
for i := 0; i != n; i++ {
slice.Index(i).Set(tmp[i])
}
return slice.Interface()
}
var typeSlice = reflect.TypeOf([]interface{}{})
var typeIface = typeSlice.Elem()
func (d *decoder) readDocElems(typ reflect.Type) reflect.Value {
docType := d.docType
d.docType = typ
slice := make([]DocElem, 0, 8)
d.readDocWith(func(kind byte, name string) {
e := DocElem{Name: name}
v := reflect.ValueOf(&e.Value)
if d.readElemTo(v.Elem(), kind) {
slice = append(slice, e)
}
})
slicev := reflect.New(typ).Elem()
slicev.Set(reflect.ValueOf(slice))
d.docType = docType
return slicev
}
func (d *decoder) readRawDocElems(typ reflect.Type) reflect.Value {
docType := d.docType
d.docType = typ
slice := make([]RawDocElem, 0, 8)
d.readDocWith(func(kind byte, name string) {
e := RawDocElem{Name: name}
v := reflect.ValueOf(&e.Value)
if d.readElemTo(v.Elem(), kind) {
slice = append(slice, e)
}
})
slicev := reflect.New(typ).Elem()
slicev.Set(reflect.ValueOf(slice))
d.docType = docType
return slicev
}
func (d *decoder) readDocWith(f func(kind byte, name string)) {
end := int(d.readInt32())
end += d.i - 4
if end <= d.i || end > len(d.in) || d.in[end-1] != '\x00' {
corrupted()
}
for d.in[d.i] != '\x00' {
kind := d.readByte()
name := d.readCStr()
if d.i >= end {
corrupted()
}
f(kind, name)
if d.i >= end {
corrupted()
}
}
d.i++ // '\x00'
if d.i != end {
corrupted()
}
}
// --------------------------------------------------------------------------
// Unmarshaling of individual elements within a document.
var blackHole = settableValueOf(struct{}{})
func (d *decoder) dropElem(kind byte) {
d.readElemTo(blackHole, kind)
}
// Attempt to decode an element from the document and put it into out.
// If the types are not compatible, the returned ok value will be
// false and out will be unchanged.
func (d *decoder) readElemTo(out reflect.Value, kind byte) (good bool) {
start := d.i
if kind == 0x03 {
// Delegate unmarshaling of documents.
outt := out.Type()
outk := out.Kind()
switch outk {
case reflect.Interface, reflect.Ptr, reflect.Struct, reflect.Map:
d.readDocTo(out)
return true
}
if setterStyle(outt) != setterNone {
d.readDocTo(out)
return true
}
if outk == reflect.Slice {
switch outt.Elem() {
case typeDocElem:
out.Set(d.readDocElems(outt))
case typeRawDocElem:
out.Set(d.readRawDocElems(outt))
default:
d.readDocTo(blackHole)
}
return true
}
d.readDocTo(blackHole)
return true
}
var in interface{}
switch kind {
case 0x01: // Float64
in = d.readFloat64()
case 0x02: // UTF-8 string
in = d.readStr()
case 0x03: // Document
panic("Can't happen. Handled above.")
case 0x04: // Array
outt := out.Type()
if setterStyle(outt) != setterNone {
// Skip the value so its data is handed to the setter below.
d.dropElem(kind)
break
}
for outt.Kind() == reflect.Ptr {
outt = outt.Elem()
}
switch outt.Kind() {
case reflect.Array:
d.readArrayDocTo(out)
return true
case reflect.Slice:
in = d.readSliceDoc(outt)
default:
in = d.readSliceDoc(typeSlice)
}
case 0x05: // Binary
b := d.readBinary()
if b.Kind == 0x00 || b.Kind == 0x02 {
in = b.Data
} else {
in = b
}
case 0x06: // Undefined (obsolete, but still seen in the wild)
in = Undefined
case 0x07: // ObjectId
in = ObjectId(d.readBytes(12))
case 0x08: // Bool
in = d.readBool()
case 0x09: // Timestamp
// MongoDB handles timestamps as milliseconds.
i := d.readInt64()
if i == -62135596800000 {
in = time.Time{} // In UTC for convenience.
} else {
in = time.Unix(i/1e3, i%1e3*1e6)
}
case 0x0A: // Nil
in = nil
case 0x0B: // RegEx
in = d.readRegEx()
case 0x0C:
in = DBPointer{Namespace: d.readStr(), Id: ObjectId(d.readBytes(12))}
case 0x0D: // JavaScript without scope
in = JavaScript{Code: d.readStr()}
case 0x0E: // Symbol
in = Symbol(d.readStr())
case 0x0F: // JavaScript with scope
d.i += 4 // Skip length
js := JavaScript{d.readStr(), make(M)}
d.readDocTo(reflect.ValueOf(js.Scope))
in = js
case 0x10: // Int32
in = int(d.readInt32())
case 0x11: // Mongo-specific timestamp
in = MongoTimestamp(d.readInt64())
case 0x12: // Int64
in = d.readInt64()
case 0x7F: // Max key
in = MaxKey
case 0xFF: // Min key
in = MinKey
default:
panic(fmt.Sprintf("Unknown element kind (0x%02X)", kind))
}
outt := out.Type()
if outt == typeRaw {
out.Set(reflect.ValueOf(Raw{kind, d.in[start:d.i]}))
return true
}
if setter := getSetter(outt, out); setter != nil {
err := setter.SetBSON(Raw{kind, d.in[start:d.i]})
if err == SetZero {
out.Set(reflect.Zero(outt))
return true
}
if err == nil {
return true
}
if _, ok := err.(*TypeError); !ok {
panic(err)
}
return false
}
if in == nil {
out.Set(reflect.Zero(outt))
return true
}
outk := outt.Kind()
// Dereference and initialize pointer if necessary.
first := true
for outk == reflect.Ptr {
if !out.IsNil() {
out = out.Elem()
} else {
elem := reflect.New(outt.Elem())
if first {
// Only set if value is compatible.
first = false
defer func(out, elem reflect.Value) {
if good {
out.Set(elem)
}
}(out, elem)
} else {
out.Set(elem)
}
out = elem
}
outt = out.Type()
outk = outt.Kind()
}
inv := reflect.ValueOf(in)
if outt == inv.Type() {
out.Set(inv)
return true
}
switch outk {
case reflect.Interface:
out.Set(inv)
return true
case reflect.String:
switch inv.Kind() {
case reflect.String:
out.SetString(inv.String())
return true
case reflect.Slice:
if b, ok := in.([]byte); ok {
out.SetString(string(b))
return true
}
case reflect.Int, reflect.Int64:
if outt == typeJSONNumber {
out.SetString(strconv.FormatInt(inv.Int(), 10))
return true
}
case reflect.Float64:
if outt == typeJSONNumber {
out.SetString(strconv.FormatFloat(inv.Float(), 'f', -1, 64))
return true
}
}
case reflect.Slice, reflect.Array:
// Remember, array (0x04) slices are built with the correct
// element type. If we are here, must be a cross BSON kind
// conversion (e.g. 0x05 unmarshalling on string).
if outt.Elem().Kind() != reflect.Uint8 {
break
}
switch inv.Kind() {
case reflect.String:
slice := []byte(inv.String())
out.Set(reflect.ValueOf(slice))
return true
case reflect.Slice:
switch outt.Kind() {
case reflect.Array:
reflect.Copy(out, inv)
case reflect.Slice:
out.SetBytes(inv.Bytes())
}
return true
}
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
switch inv.Kind() {
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
out.SetInt(inv.Int())
return true
case reflect.Float32, reflect.Float64:
out.SetInt(int64(inv.Float()))
return true
case reflect.Bool:
if inv.Bool() {
out.SetInt(1)
} else {
out.SetInt(0)
}
return true
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
panic("can't happen: no uint types in BSON (!?)")
}
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
switch inv.Kind() {
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
out.SetUint(uint64(inv.Int()))
return true
case reflect.Float32, reflect.Float64:
out.SetUint(uint64(inv.Float()))
return true
case reflect.Bool:
if inv.Bool() {
out.SetUint(1)
} else {
out.SetUint(0)
}
return true
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
panic("Can't happen. No uint types in BSON.")
}
case reflect.Float32, reflect.Float64:
switch inv.Kind() {
case reflect.Float32, reflect.Float64:
out.SetFloat(inv.Float())
return true
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
out.SetFloat(float64(inv.Int()))
return true
case reflect.Bool:
if inv.Bool() {
out.SetFloat(1)
} else {
out.SetFloat(0)
}
return true
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
panic("Can't happen. No uint types in BSON?")
}
case reflect.Bool:
switch inv.Kind() {
case reflect.Bool:
out.SetBool(inv.Bool())
return true
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
out.SetBool(inv.Int() != 0)
return true
case reflect.Float32, reflect.Float64:
out.SetBool(inv.Float() != 0)
return true
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
panic("Can't happen. No uint types in BSON?")
}
case reflect.Struct:
if outt == typeURL && inv.Kind() == reflect.String {
u, err := url.Parse(inv.String())
if err != nil {
panic(err)
}
out.Set(reflect.ValueOf(u).Elem())
return true
}
if outt == typeBinary {
if b, ok := in.([]byte); ok {
out.Set(reflect.ValueOf(Binary{Data: b}))
return true
}
}
}
return false
}
// --------------------------------------------------------------------------
// Parsers of basic types.
func (d *decoder) readRegEx() RegEx {
re := RegEx{}
re.Pattern = d.readCStr()
re.Options = d.readCStr()
return re
}
func (d *decoder) readBinary() Binary {
l := d.readInt32()
b := Binary{}
b.Kind = d.readByte()
b.Data = d.readBytes(l)
if b.Kind == 0x02 && len(b.Data) >= 4 {
// Weird obsolete format with redundant length.
b.Data = b.Data[4:]
}
return b
}
func (d *decoder) readStr() string {
l := d.readInt32()
b := d.readBytes(l - 1)
if d.readByte() != '\x00' {
corrupted()
}
return string(b)
}
func (d *decoder) readCStr() string {
start := d.i
end := start
l := len(d.in)
for ; end != l; end++ {
if d.in[end] == '\x00' {
break
}
}
d.i = end + 1
if d.i > l {
corrupted()
}
return string(d.in[start:end])
}
func (d *decoder) readBool() bool {
b := d.readByte()
if b == 0 {
return false
}
if b == 1 {
return true
}
panic(fmt.Sprintf("encoded boolean must be 1 or 0, found %d", b))
}
func (d *decoder) readFloat64() float64 {
return math.Float64frombits(uint64(d.readInt64()))
}
func (d *decoder) readInt32() int32 {
b := d.readBytes(4)
return int32((uint32(b[0]) << 0) |
(uint32(b[1]) << 8) |
(uint32(b[2]) << 16) |
(uint32(b[3]) << 24))
}
func (d *decoder) readInt64() int64 {
b := d.readBytes(8)
return int64((uint64(b[0]) << 0) |
(uint64(b[1]) << 8) |
(uint64(b[2]) << 16) |
(uint64(b[3]) << 24) |
(uint64(b[4]) << 32) |
(uint64(b[5]) << 40) |
(uint64(b[6]) << 48) |
(uint64(b[7]) << 56))
}
func (d *decoder) readByte() byte {
i := d.i
d.i++
if d.i > len(d.in) {
corrupted()
}
return d.in[i]
}
func (d *decoder) readBytes(length int32) []byte {
if length < 0 {
corrupted()
}
start := d.i
d.i += int(length)
if d.i < start || d.i > len(d.in) {
corrupted()
}
return d.in[start : start+int(length)]
}

509
vendor/gopkg.in/mgo.v2/bson/encode.go generated vendored Normal file
View file

@ -0,0 +1,509 @@
// 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(""))
typeDBPointer = reflect.TypeOf(DBPointer{"", 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 marshal Raw kind " + strconv.Itoa(int(raw.Kind)) + " as a document")
}
if len(raw.Data) == 0 {
panic("Attempted to marshal empty Raw 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:
vt := v.Type()
if vt == typeTime {
return v.Interface().(time.Time).IsZero()
}
for i := 0; i < v.NumField(); i++ {
if vt.Field(i).PkgPath != "" && !vt.Field(i).Anonymous {
continue // Private field
}
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)
if v.CanAddr() {
e.addBinary('\x00', v.Slice(0, v.Len()).Interface().([]byte))
} else {
n := v.Len()
e.addInt32(int32(n))
e.addBytes('\x00')
for i := 0; i < n; i++ {
el := v.Index(i)
e.addBytes(byte(el.Uint()))
}
}
} 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
}
if len(s.Data) == 0 && kind != 0x06 && kind != 0x0A && kind != 0xFF && kind != 0x7F {
panic("Attempted to marshal empty Raw document")
}
e.addElemName(kind, name)
e.addBytes(s.Data...)
case Binary:
e.addElemName('\x05', name)
e.addBinary(s.Kind, s.Data)
case DBPointer:
e.addElemName('\x0C', name)
e.addStr(s.Namespace)
if len(s.Id) != 12 {
panic("ObjectIDs must be exactly 12 bytes long (got " +
strconv.Itoa(len(s.Id)) + ")")
}
e.addBytes([]byte(s.Id)...)
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...)
}