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224 lines
9.0 KiB
224 lines
9.0 KiB
// Copyright (C) MongoDB, Inc. 2017-present.
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//
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// Licensed under the Apache License, Version 2.0 (the "License"); you may
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// not use this file except in compliance with the License. You may obtain
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// a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
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package bson
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import (
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"go.mongodb.org/mongo-driver/bson/bsoncodec"
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"go.mongodb.org/mongo-driver/bson/bsonrw"
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"go.mongodb.org/mongo-driver/bson/bsontype"
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)
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const defaultDstCap = 256
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var bvwPool = bsonrw.NewBSONValueWriterPool()
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var extjPool = bsonrw.NewExtJSONValueWriterPool()
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// Marshaler is an interface implemented by types that can marshal themselves
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// into a BSON document represented as bytes. The bytes returned must be a valid
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// BSON document if the error is nil.
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type Marshaler interface {
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MarshalBSON() ([]byte, error)
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}
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// ValueMarshaler is an interface implemented by types that can marshal
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// themselves into a BSON value as bytes. The type must be the valid type for
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// the bytes returned. The bytes and byte type together must be valid if the
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// error is nil.
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type ValueMarshaler interface {
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MarshalBSONValue() (bsontype.Type, []byte, error)
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}
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// Marshal returns the BSON encoding of val as a BSON document. If val is not a type that can be transformed into a
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// document, MarshalValue should be used instead.
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//
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// Marshal will use the default registry created by NewRegistry to recursively
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// marshal val into a []byte. Marshal will inspect struct tags and alter the
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// marshaling process accordingly.
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func Marshal(val interface{}) ([]byte, error) {
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return MarshalWithRegistry(DefaultRegistry, val)
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}
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// MarshalAppend will encode val as a BSON document and append the bytes to dst. If dst is not large enough to hold the
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// bytes, it will be grown. If val is not a type that can be transformed into a document, MarshalValueAppend should be
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// used instead.
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func MarshalAppend(dst []byte, val interface{}) ([]byte, error) {
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return MarshalAppendWithRegistry(DefaultRegistry, dst, val)
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}
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// MarshalWithRegistry returns the BSON encoding of val as a BSON document. If val is not a type that can be transformed
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// into a document, MarshalValueWithRegistry should be used instead.
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func MarshalWithRegistry(r *bsoncodec.Registry, val interface{}) ([]byte, error) {
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dst := make([]byte, 0, 256) // TODO: make the default cap a constant
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return MarshalAppendWithRegistry(r, dst, val)
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}
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// MarshalWithContext returns the BSON encoding of val as a BSON document using EncodeContext ec. If val is not a type
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// that can be transformed into a document, MarshalValueWithContext should be used instead.
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func MarshalWithContext(ec bsoncodec.EncodeContext, val interface{}) ([]byte, error) {
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dst := make([]byte, 0, 256) // TODO: make the default cap a constant
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return MarshalAppendWithContext(ec, dst, val)
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}
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// MarshalAppendWithRegistry will encode val as a BSON document using Registry r and append the bytes to dst. If dst is
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// not large enough to hold the bytes, it will be grown. If val is not a type that can be transformed into a document,
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// MarshalValueAppendWithRegistry should be used instead.
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func MarshalAppendWithRegistry(r *bsoncodec.Registry, dst []byte, val interface{}) ([]byte, error) {
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return MarshalAppendWithContext(bsoncodec.EncodeContext{Registry: r}, dst, val)
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}
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// MarshalAppendWithContext will encode val as a BSON document using Registry r and EncodeContext ec and append the
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// bytes to dst. If dst is not large enough to hold the bytes, it will be grown. If val is not a type that can be
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// transformed into a document, MarshalValueAppendWithContext should be used instead.
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func MarshalAppendWithContext(ec bsoncodec.EncodeContext, dst []byte, val interface{}) ([]byte, error) {
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sw := new(bsonrw.SliceWriter)
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*sw = dst
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vw := bvwPool.Get(sw)
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defer bvwPool.Put(vw)
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enc := encPool.Get().(*Encoder)
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defer encPool.Put(enc)
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err := enc.Reset(vw)
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if err != nil {
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return nil, err
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}
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err = enc.SetContext(ec)
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if err != nil {
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return nil, err
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}
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err = enc.Encode(val)
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if err != nil {
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return nil, err
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}
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return *sw, nil
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}
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// MarshalValue returns the BSON encoding of val.
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//
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// MarshalValue will use bson.DefaultRegistry to transform val into a BSON value. If val is a struct, this function will
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// inspect struct tags and alter the marshalling process accordingly.
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func MarshalValue(val interface{}) (bsontype.Type, []byte, error) {
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return MarshalValueWithRegistry(DefaultRegistry, val)
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}
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// MarshalValueAppend will append the BSON encoding of val to dst. If dst is not large enough to hold the BSON encoding
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// of val, dst will be grown.
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func MarshalValueAppend(dst []byte, val interface{}) (bsontype.Type, []byte, error) {
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return MarshalValueAppendWithRegistry(DefaultRegistry, dst, val)
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}
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// MarshalValueWithRegistry returns the BSON encoding of val using Registry r.
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func MarshalValueWithRegistry(r *bsoncodec.Registry, val interface{}) (bsontype.Type, []byte, error) {
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dst := make([]byte, 0, defaultDstCap)
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return MarshalValueAppendWithRegistry(r, dst, val)
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}
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// MarshalValueWithContext returns the BSON encoding of val using EncodeContext ec.
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func MarshalValueWithContext(ec bsoncodec.EncodeContext, val interface{}) (bsontype.Type, []byte, error) {
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dst := make([]byte, 0, defaultDstCap)
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return MarshalValueAppendWithContext(ec, dst, val)
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}
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// MarshalValueAppendWithRegistry will append the BSON encoding of val to dst using Registry r. If dst is not large
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// enough to hold the BSON encoding of val, dst will be grown.
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func MarshalValueAppendWithRegistry(r *bsoncodec.Registry, dst []byte, val interface{}) (bsontype.Type, []byte, error) {
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return MarshalValueAppendWithContext(bsoncodec.EncodeContext{Registry: r}, dst, val)
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}
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// MarshalValueAppendWithContext will append the BSON encoding of val to dst using EncodeContext ec. If dst is not large
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// enough to hold the BSON encoding of val, dst will be grown.
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func MarshalValueAppendWithContext(ec bsoncodec.EncodeContext, dst []byte, val interface{}) (bsontype.Type, []byte, error) {
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// get a ValueWriter configured to write to dst
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sw := new(bsonrw.SliceWriter)
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*sw = dst
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vwFlusher := bvwPool.GetAtModeElement(sw)
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// get an Encoder and encode the value
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enc := encPool.Get().(*Encoder)
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defer encPool.Put(enc)
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if err := enc.Reset(vwFlusher); err != nil {
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return 0, nil, err
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}
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if err := enc.SetContext(ec); err != nil {
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return 0, nil, err
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}
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if err := enc.Encode(val); err != nil {
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return 0, nil, err
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}
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// flush the bytes written because we cannot guarantee that a full document has been written
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// after the flush, *sw will be in the format
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// [value type, 0 (null byte to indicate end of empty element name), value bytes..]
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if err := vwFlusher.Flush(); err != nil {
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return 0, nil, err
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}
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buffer := *sw
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return bsontype.Type(buffer[0]), buffer[2:], nil
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}
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// MarshalExtJSON returns the extended JSON encoding of val.
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func MarshalExtJSON(val interface{}, canonical, escapeHTML bool) ([]byte, error) {
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return MarshalExtJSONWithRegistry(DefaultRegistry, val, canonical, escapeHTML)
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}
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// MarshalExtJSONAppend will append the extended JSON encoding of val to dst.
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// If dst is not large enough to hold the extended JSON encoding of val, dst
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// will be grown.
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func MarshalExtJSONAppend(dst []byte, val interface{}, canonical, escapeHTML bool) ([]byte, error) {
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return MarshalExtJSONAppendWithRegistry(DefaultRegistry, dst, val, canonical, escapeHTML)
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}
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// MarshalExtJSONWithRegistry returns the extended JSON encoding of val using Registry r.
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func MarshalExtJSONWithRegistry(r *bsoncodec.Registry, val interface{}, canonical, escapeHTML bool) ([]byte, error) {
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dst := make([]byte, 0, defaultDstCap)
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return MarshalExtJSONAppendWithContext(bsoncodec.EncodeContext{Registry: r}, dst, val, canonical, escapeHTML)
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}
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// MarshalExtJSONWithContext returns the extended JSON encoding of val using Registry r.
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func MarshalExtJSONWithContext(ec bsoncodec.EncodeContext, val interface{}, canonical, escapeHTML bool) ([]byte, error) {
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dst := make([]byte, 0, defaultDstCap)
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return MarshalExtJSONAppendWithContext(ec, dst, val, canonical, escapeHTML)
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}
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// MarshalExtJSONAppendWithRegistry will append the extended JSON encoding of
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// val to dst using Registry r. If dst is not large enough to hold the BSON
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// encoding of val, dst will be grown.
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func MarshalExtJSONAppendWithRegistry(r *bsoncodec.Registry, dst []byte, val interface{}, canonical, escapeHTML bool) ([]byte, error) {
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return MarshalExtJSONAppendWithContext(bsoncodec.EncodeContext{Registry: r}, dst, val, canonical, escapeHTML)
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}
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// MarshalExtJSONAppendWithContext will append the extended JSON encoding of
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// val to dst using Registry r. If dst is not large enough to hold the BSON
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// encoding of val, dst will be grown.
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func MarshalExtJSONAppendWithContext(ec bsoncodec.EncodeContext, dst []byte, val interface{}, canonical, escapeHTML bool) ([]byte, error) {
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sw := new(bsonrw.SliceWriter)
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*sw = dst
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ejvw := extjPool.Get(sw, canonical, escapeHTML)
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defer extjPool.Put(ejvw)
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enc := encPool.Get().(*Encoder)
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defer encPool.Put(enc)
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err := enc.Reset(ejvw)
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if err != nil {
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return nil, err
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}
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err = enc.SetContext(ec)
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if err != nil {
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return nil, err
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}
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err = enc.Encode(val)
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if err != nil {
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return nil, err
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}
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return *sw, nil
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}
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