mirror of
https://github.com/superseriousbusiness/gotosocial.git
synced 2024-12-05 01:52:46 +00:00
200 lines
6.2 KiB
Go
200 lines
6.2 KiB
Go
// Copyright (C) MongoDB, Inc. 2017-present.
|
|
//
|
|
// Licensed under the Apache License, Version 2.0 (the "License"); you may
|
|
// not use this file except in compliance with the License. You may obtain
|
|
// a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
|
|
|
|
package bson
|
|
|
|
import (
|
|
"errors"
|
|
"reflect"
|
|
"sync"
|
|
|
|
"go.mongodb.org/mongo-driver/bson/bsoncodec"
|
|
"go.mongodb.org/mongo-driver/bson/bsonrw"
|
|
)
|
|
|
|
// This pool is used to keep the allocations of Encoders down. This is only used for the Marshal*
|
|
// methods and is not consumable from outside of this package. The Encoders retrieved from this pool
|
|
// must have both Reset and SetRegistry called on them.
|
|
var encPool = sync.Pool{
|
|
New: func() interface{} {
|
|
return new(Encoder)
|
|
},
|
|
}
|
|
|
|
// An Encoder writes a serialization format to an output stream. It writes to a bsonrw.ValueWriter
|
|
// as the destination of BSON data.
|
|
type Encoder struct {
|
|
ec bsoncodec.EncodeContext
|
|
vw bsonrw.ValueWriter
|
|
|
|
errorOnInlineDuplicates bool
|
|
intMinSize bool
|
|
stringifyMapKeysWithFmt bool
|
|
nilMapAsEmpty bool
|
|
nilSliceAsEmpty bool
|
|
nilByteSliceAsEmpty bool
|
|
omitZeroStruct bool
|
|
useJSONStructTags bool
|
|
}
|
|
|
|
// NewEncoder returns a new encoder that uses the DefaultRegistry to write to vw.
|
|
func NewEncoder(vw bsonrw.ValueWriter) (*Encoder, error) {
|
|
// TODO:(GODRIVER-2719): Remove error return value.
|
|
if vw == nil {
|
|
return nil, errors.New("cannot create a new Encoder with a nil ValueWriter")
|
|
}
|
|
|
|
return &Encoder{
|
|
ec: bsoncodec.EncodeContext{Registry: DefaultRegistry},
|
|
vw: vw,
|
|
}, nil
|
|
}
|
|
|
|
// NewEncoderWithContext returns a new encoder that uses EncodeContext ec to write to vw.
|
|
//
|
|
// Deprecated: Use [NewEncoder] and use the Encoder configuration methods to set the desired marshal
|
|
// behavior instead.
|
|
func NewEncoderWithContext(ec bsoncodec.EncodeContext, vw bsonrw.ValueWriter) (*Encoder, error) {
|
|
if ec.Registry == nil {
|
|
ec = bsoncodec.EncodeContext{Registry: DefaultRegistry}
|
|
}
|
|
if vw == nil {
|
|
return nil, errors.New("cannot create a new Encoder with a nil ValueWriter")
|
|
}
|
|
|
|
return &Encoder{
|
|
ec: ec,
|
|
vw: vw,
|
|
}, nil
|
|
}
|
|
|
|
// Encode writes the BSON encoding of val to the stream.
|
|
//
|
|
// See [Marshal] for details about BSON marshaling behavior.
|
|
func (e *Encoder) Encode(val interface{}) error {
|
|
if marshaler, ok := val.(Marshaler); ok {
|
|
// TODO(skriptble): Should we have a MarshalAppender interface so that we can have []byte reuse?
|
|
buf, err := marshaler.MarshalBSON()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
return bsonrw.Copier{}.CopyDocumentFromBytes(e.vw, buf)
|
|
}
|
|
|
|
encoder, err := e.ec.LookupEncoder(reflect.TypeOf(val))
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
// Copy the configurations applied to the Encoder over to the EncodeContext, which actually
|
|
// communicates those configurations to the default ValueEncoders.
|
|
if e.errorOnInlineDuplicates {
|
|
e.ec.ErrorOnInlineDuplicates()
|
|
}
|
|
if e.intMinSize {
|
|
e.ec.MinSize = true
|
|
}
|
|
if e.stringifyMapKeysWithFmt {
|
|
e.ec.StringifyMapKeysWithFmt()
|
|
}
|
|
if e.nilMapAsEmpty {
|
|
e.ec.NilMapAsEmpty()
|
|
}
|
|
if e.nilSliceAsEmpty {
|
|
e.ec.NilSliceAsEmpty()
|
|
}
|
|
if e.nilByteSliceAsEmpty {
|
|
e.ec.NilByteSliceAsEmpty()
|
|
}
|
|
if e.omitZeroStruct {
|
|
e.ec.OmitZeroStruct()
|
|
}
|
|
if e.useJSONStructTags {
|
|
e.ec.UseJSONStructTags()
|
|
}
|
|
|
|
return encoder.EncodeValue(e.ec, e.vw, reflect.ValueOf(val))
|
|
}
|
|
|
|
// Reset will reset the state of the Encoder, using the same *EncodeContext used in
|
|
// the original construction but using vw.
|
|
func (e *Encoder) Reset(vw bsonrw.ValueWriter) error {
|
|
// TODO:(GODRIVER-2719): Remove error return value.
|
|
e.vw = vw
|
|
return nil
|
|
}
|
|
|
|
// SetRegistry replaces the current registry of the Encoder with r.
|
|
func (e *Encoder) SetRegistry(r *bsoncodec.Registry) error {
|
|
// TODO:(GODRIVER-2719): Remove error return value.
|
|
e.ec.Registry = r
|
|
return nil
|
|
}
|
|
|
|
// SetContext replaces the current EncodeContext of the encoder with ec.
|
|
//
|
|
// Deprecated: Use the Encoder configuration methods set the desired marshal behavior instead.
|
|
func (e *Encoder) SetContext(ec bsoncodec.EncodeContext) error {
|
|
// TODO:(GODRIVER-2719): Remove error return value.
|
|
e.ec = ec
|
|
return nil
|
|
}
|
|
|
|
// ErrorOnInlineDuplicates causes the Encoder to return an error if there is a duplicate field in
|
|
// the marshaled BSON when the "inline" struct tag option is set.
|
|
func (e *Encoder) ErrorOnInlineDuplicates() {
|
|
e.errorOnInlineDuplicates = true
|
|
}
|
|
|
|
// IntMinSize causes the Encoder to marshal Go integer values (int, int8, int16, int32, int64, uint,
|
|
// uint8, uint16, uint32, or uint64) as the minimum BSON int size (either 32 or 64 bits) that can
|
|
// represent the integer value.
|
|
func (e *Encoder) IntMinSize() {
|
|
e.intMinSize = true
|
|
}
|
|
|
|
// StringifyMapKeysWithFmt causes the Encoder to convert Go map keys to BSON document field name
|
|
// strings using fmt.Sprint instead of the default string conversion logic.
|
|
func (e *Encoder) StringifyMapKeysWithFmt() {
|
|
e.stringifyMapKeysWithFmt = true
|
|
}
|
|
|
|
// NilMapAsEmpty causes the Encoder to marshal nil Go maps as empty BSON documents instead of BSON
|
|
// null.
|
|
func (e *Encoder) NilMapAsEmpty() {
|
|
e.nilMapAsEmpty = true
|
|
}
|
|
|
|
// NilSliceAsEmpty causes the Encoder to marshal nil Go slices as empty BSON arrays instead of BSON
|
|
// null.
|
|
func (e *Encoder) NilSliceAsEmpty() {
|
|
e.nilSliceAsEmpty = true
|
|
}
|
|
|
|
// NilByteSliceAsEmpty causes the Encoder to marshal nil Go byte slices as empty BSON binary values
|
|
// instead of BSON null.
|
|
func (e *Encoder) NilByteSliceAsEmpty() {
|
|
e.nilByteSliceAsEmpty = true
|
|
}
|
|
|
|
// TODO(GODRIVER-2820): Update the description to remove the note about only examining exported
|
|
// TODO struct fields once the logic is updated to also inspect private struct fields.
|
|
|
|
// OmitZeroStruct causes the Encoder to consider the zero value for a struct (e.g. MyStruct{})
|
|
// as empty and omit it from the marshaled BSON when the "omitempty" struct tag option is set.
|
|
//
|
|
// Note that the Encoder only examines exported struct fields when determining if a struct is the
|
|
// zero value. It considers pointers to a zero struct value (e.g. &MyStruct{}) not empty.
|
|
func (e *Encoder) OmitZeroStruct() {
|
|
e.omitZeroStruct = true
|
|
}
|
|
|
|
// UseJSONStructTags causes the Encoder to fall back to using the "json" struct tag if a "bson"
|
|
// struct tag is not specified.
|
|
func (e *Encoder) UseJSONStructTags() {
|
|
e.useJSONStructTags = true
|
|
}
|