mirror of
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792b4dba2c
* update github.com/blevesearch/bleve v2.0.2 -> v2.0.3 * github.com/denisenkom/go-mssqldb v0.9.0 -> v0.10.0 * github.com/editorconfig/editorconfig-core-go v2.4.1 -> v2.4.2 * github.com/go-chi/cors v1.1.1 -> v1.2.0 * github.com/go-git/go-billy v5.0.0 -> v5.1.0 * github.com/go-git/go-git v5.2.0 -> v5.3.0 * github.com/go-ldap/ldap v3.2.4 -> v3.3.0 * github.com/go-redis/redis v8.6.0 -> v8.8.2 * github.com/go-sql-driver/mysql v1.5.0 -> v1.6.0 * github.com/go-swagger/go-swagger v0.26.1 -> v0.27.0 * github.com/lib/pq v1.9.0 -> v1.10.1 * github.com/mattn/go-sqlite3 v1.14.6 -> v1.14.7 * github.com/go-testfixtures/testfixtures v3.5.0 -> v3.6.0 * github.com/issue9/identicon v1.0.1 -> v1.2.0 * github.com/klauspost/compress v1.11.8 -> v1.12.1 * github.com/mgechev/revive v1.0.3 -> v1.0.6 * github.com/microcosm-cc/bluemonday v1.0.7 -> v1.0.8 * github.com/niklasfasching/go-org v1.4.0 -> v1.5.0 * github.com/olivere/elastic v7.0.22 -> v7.0.24 * github.com/pelletier/go-toml v1.8.1 -> v1.9.0 * github.com/prometheus/client_golang v1.9.0 -> v1.10.0 * github.com/xanzy/go-gitlab v0.44.0 -> v0.48.0 * github.com/yuin/goldmark v1.3.3 -> v1.3.5 * github.com/6543/go-version v1.2.4 -> v1.3.1 * do github.com/lib/pq v1.10.0 -> v1.10.1 again ...
217 lines
7.4 KiB
Go
Vendored
217 lines
7.4 KiB
Go
Vendored
// 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 bsoncodec // import "go.mongodb.org/mongo-driver/bson/bsoncodec"
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import (
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"fmt"
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"reflect"
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"strings"
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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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var (
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emptyValue = reflect.Value{}
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)
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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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// Unmarshaler is an interface implemented by types that can unmarshal a BSON
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// document representation of themselves. The BSON bytes can be assumed to be
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// valid. UnmarshalBSON must copy the BSON bytes if it wishes to retain the data
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// after returning.
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type Unmarshaler interface {
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UnmarshalBSON([]byte) error
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}
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// ValueUnmarshaler is an interface implemented by types that can unmarshal a
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// BSON value representaiton of themselves. The BSON bytes and type can be
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// assumed to be valid. UnmarshalBSONValue must copy the BSON value bytes if it
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// wishes to retain the data after returning.
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type ValueUnmarshaler interface {
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UnmarshalBSONValue(bsontype.Type, []byte) error
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}
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// ValueEncoderError is an error returned from a ValueEncoder when the provided value can't be
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// encoded by the ValueEncoder.
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type ValueEncoderError struct {
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Name string
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Types []reflect.Type
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Kinds []reflect.Kind
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Received reflect.Value
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}
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func (vee ValueEncoderError) Error() string {
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typeKinds := make([]string, 0, len(vee.Types)+len(vee.Kinds))
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for _, t := range vee.Types {
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typeKinds = append(typeKinds, t.String())
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}
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for _, k := range vee.Kinds {
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if k == reflect.Map {
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typeKinds = append(typeKinds, "map[string]*")
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continue
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}
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typeKinds = append(typeKinds, k.String())
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}
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received := vee.Received.Kind().String()
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if vee.Received.IsValid() {
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received = vee.Received.Type().String()
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}
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return fmt.Sprintf("%s can only encode valid %s, but got %s", vee.Name, strings.Join(typeKinds, ", "), received)
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}
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// ValueDecoderError is an error returned from a ValueDecoder when the provided value can't be
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// decoded by the ValueDecoder.
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type ValueDecoderError struct {
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Name string
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Types []reflect.Type
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Kinds []reflect.Kind
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Received reflect.Value
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}
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func (vde ValueDecoderError) Error() string {
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typeKinds := make([]string, 0, len(vde.Types)+len(vde.Kinds))
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for _, t := range vde.Types {
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typeKinds = append(typeKinds, t.String())
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}
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for _, k := range vde.Kinds {
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if k == reflect.Map {
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typeKinds = append(typeKinds, "map[string]*")
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continue
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}
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typeKinds = append(typeKinds, k.String())
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}
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received := vde.Received.Kind().String()
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if vde.Received.IsValid() {
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received = vde.Received.Type().String()
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}
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return fmt.Sprintf("%s can only decode valid and settable %s, but got %s", vde.Name, strings.Join(typeKinds, ", "), received)
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}
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// EncodeContext is the contextual information required for a Codec to encode a
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// value.
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type EncodeContext struct {
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*Registry
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MinSize bool
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}
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// DecodeContext is the contextual information required for a Codec to decode a
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// value.
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type DecodeContext struct {
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*Registry
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Truncate bool
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// Ancestor is the type of a containing document. This is mainly used to determine what type
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// should be used when decoding an embedded document into an empty interface. For example, if
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// Ancestor is a bson.M, BSON embedded document values being decoded into an empty interface
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// will be decoded into a bson.M.
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Ancestor reflect.Type
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}
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// ValueCodec is the interface that groups the methods to encode and decode
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// values.
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type ValueCodec interface {
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ValueEncoder
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ValueDecoder
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}
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// ValueEncoder is the interface implemented by types that can handle the encoding of a value.
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type ValueEncoder interface {
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EncodeValue(EncodeContext, bsonrw.ValueWriter, reflect.Value) error
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}
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// ValueEncoderFunc is an adapter function that allows a function with the correct signature to be
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// used as a ValueEncoder.
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type ValueEncoderFunc func(EncodeContext, bsonrw.ValueWriter, reflect.Value) error
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// EncodeValue implements the ValueEncoder interface.
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func (fn ValueEncoderFunc) EncodeValue(ec EncodeContext, vw bsonrw.ValueWriter, val reflect.Value) error {
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return fn(ec, vw, val)
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}
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// ValueDecoder is the interface implemented by types that can handle the decoding of a value.
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type ValueDecoder interface {
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DecodeValue(DecodeContext, bsonrw.ValueReader, reflect.Value) error
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}
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// ValueDecoderFunc is an adapter function that allows a function with the correct signature to be
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// used as a ValueDecoder.
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type ValueDecoderFunc func(DecodeContext, bsonrw.ValueReader, reflect.Value) error
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// DecodeValue implements the ValueDecoder interface.
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func (fn ValueDecoderFunc) DecodeValue(dc DecodeContext, vr bsonrw.ValueReader, val reflect.Value) error {
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return fn(dc, vr, val)
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}
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// typeDecoder is the interface implemented by types that can handle the decoding of a value given its type.
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type typeDecoder interface {
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decodeType(DecodeContext, bsonrw.ValueReader, reflect.Type) (reflect.Value, error)
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}
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// typeDecoderFunc is an adapter function that allows a function with the correct signature to be used as a typeDecoder.
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type typeDecoderFunc func(DecodeContext, bsonrw.ValueReader, reflect.Type) (reflect.Value, error)
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func (fn typeDecoderFunc) decodeType(dc DecodeContext, vr bsonrw.ValueReader, t reflect.Type) (reflect.Value, error) {
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return fn(dc, vr, t)
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}
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// decodeAdapter allows two functions with the correct signatures to be used as both a ValueDecoder and typeDecoder.
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type decodeAdapter struct {
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ValueDecoderFunc
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typeDecoderFunc
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}
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var _ ValueDecoder = decodeAdapter{}
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var _ typeDecoder = decodeAdapter{}
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// decodeTypeOrValue calls decoder.decodeType is decoder is a typeDecoder. Otherwise, it allocates a new element of type
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// t and calls decoder.DecodeValue on it.
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func decodeTypeOrValue(decoder ValueDecoder, dc DecodeContext, vr bsonrw.ValueReader, t reflect.Type) (reflect.Value, error) {
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td, _ := decoder.(typeDecoder)
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return decodeTypeOrValueWithInfo(decoder, td, dc, vr, t, true)
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}
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func decodeTypeOrValueWithInfo(vd ValueDecoder, td typeDecoder, dc DecodeContext, vr bsonrw.ValueReader, t reflect.Type, convert bool) (reflect.Value, error) {
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if td != nil {
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val, err := td.decodeType(dc, vr, t)
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if err == nil && convert && val.Type() != t {
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// This conversion step is necessary for slices and maps. If a user declares variables like:
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//
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// type myBool bool
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// var m map[string]myBool
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//
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// and tries to decode BSON bytes into the map, the decoding will fail if this conversion is not present
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// because we'll try to assign a value of type bool to one of type myBool.
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val = val.Convert(t)
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}
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return val, err
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}
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val := reflect.New(t).Elem()
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err := vd.DecodeValue(dc, vr, val)
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return val, err
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}
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// CodecZeroer is the interface implemented by Codecs that can also determine if
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// a value of the type that would be encoded is zero.
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type CodecZeroer interface {
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IsTypeZero(interface{}) bool
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}
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