mirror of
https://github.com/superseriousbusiness/gotosocial.git
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525 lines
19 KiB
Go
525 lines
19 KiB
Go
// 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
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import (
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"errors"
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"fmt"
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"reflect"
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"sync"
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"go.mongodb.org/mongo-driver/bson/bsontype"
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)
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// ErrNilType is returned when nil is passed to either LookupEncoder or LookupDecoder.
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//
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// Deprecated: ErrNilType will not be supported in Go Driver 2.0.
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var ErrNilType = errors.New("cannot perform a decoder lookup on <nil>")
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// ErrNotPointer is returned when a non-pointer type is provided to LookupDecoder.
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//
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// Deprecated: ErrNotPointer will not be supported in Go Driver 2.0.
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var ErrNotPointer = errors.New("non-pointer provided to LookupDecoder")
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// ErrNoEncoder is returned when there wasn't an encoder available for a type.
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//
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// Deprecated: ErrNoEncoder will not be supported in Go Driver 2.0.
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type ErrNoEncoder struct {
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Type reflect.Type
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}
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func (ene ErrNoEncoder) Error() string {
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if ene.Type == nil {
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return "no encoder found for <nil>"
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}
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return "no encoder found for " + ene.Type.String()
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}
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// ErrNoDecoder is returned when there wasn't a decoder available for a type.
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//
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// Deprecated: ErrNoDecoder will not be supported in Go Driver 2.0.
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type ErrNoDecoder struct {
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Type reflect.Type
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}
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func (end ErrNoDecoder) Error() string {
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return "no decoder found for " + end.Type.String()
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}
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// ErrNoTypeMapEntry is returned when there wasn't a type available for the provided BSON type.
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//
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// Deprecated: ErrNoTypeMapEntry will not be supported in Go Driver 2.0.
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type ErrNoTypeMapEntry struct {
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Type bsontype.Type
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}
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func (entme ErrNoTypeMapEntry) Error() string {
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return "no type map entry found for " + entme.Type.String()
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}
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// ErrNotInterface is returned when the provided type is not an interface.
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//
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// Deprecated: ErrNotInterface will not be supported in Go Driver 2.0.
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var ErrNotInterface = errors.New("The provided type is not an interface")
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// A RegistryBuilder is used to build a Registry. This type is not goroutine
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// safe.
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//
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// Deprecated: Use Registry instead.
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type RegistryBuilder struct {
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registry *Registry
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}
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// NewRegistryBuilder creates a new empty RegistryBuilder.
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//
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// Deprecated: Use NewRegistry instead.
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func NewRegistryBuilder() *RegistryBuilder {
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return &RegistryBuilder{
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registry: NewRegistry(),
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}
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}
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// RegisterCodec will register the provided ValueCodec for the provided type.
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//
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// Deprecated: Use Registry.RegisterTypeEncoder and Registry.RegisterTypeDecoder instead.
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func (rb *RegistryBuilder) RegisterCodec(t reflect.Type, codec ValueCodec) *RegistryBuilder {
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rb.RegisterTypeEncoder(t, codec)
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rb.RegisterTypeDecoder(t, codec)
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return rb
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}
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// RegisterTypeEncoder will register the provided ValueEncoder for the provided type.
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//
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// The type will be used directly, so an encoder can be registered for a type and a different encoder can be registered
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// for a pointer to that type.
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//
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// If the given type is an interface, the encoder will be called when marshaling a type that is that interface. It
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// will not be called when marshaling a non-interface type that implements the interface.
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//
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// Deprecated: Use Registry.RegisterTypeEncoder instead.
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func (rb *RegistryBuilder) RegisterTypeEncoder(t reflect.Type, enc ValueEncoder) *RegistryBuilder {
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rb.registry.RegisterTypeEncoder(t, enc)
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return rb
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}
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// RegisterHookEncoder will register an encoder for the provided interface type t. This encoder will be called when
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// marshaling a type if the type implements t or a pointer to the type implements t. If the provided type is not
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// an interface (i.e. t.Kind() != reflect.Interface), this method will panic.
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//
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// Deprecated: Use Registry.RegisterInterfaceEncoder instead.
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func (rb *RegistryBuilder) RegisterHookEncoder(t reflect.Type, enc ValueEncoder) *RegistryBuilder {
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rb.registry.RegisterInterfaceEncoder(t, enc)
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return rb
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}
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// RegisterTypeDecoder will register the provided ValueDecoder for the provided type.
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//
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// The type will be used directly, so a decoder can be registered for a type and a different decoder can be registered
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// for a pointer to that type.
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//
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// If the given type is an interface, the decoder will be called when unmarshaling into a type that is that interface.
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// It will not be called when unmarshaling into a non-interface type that implements the interface.
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//
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// Deprecated: Use Registry.RegisterTypeDecoder instead.
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func (rb *RegistryBuilder) RegisterTypeDecoder(t reflect.Type, dec ValueDecoder) *RegistryBuilder {
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rb.registry.RegisterTypeDecoder(t, dec)
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return rb
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}
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// RegisterHookDecoder will register an decoder for the provided interface type t. This decoder will be called when
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// unmarshaling into a type if the type implements t or a pointer to the type implements t. If the provided type is not
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// an interface (i.e. t.Kind() != reflect.Interface), this method will panic.
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//
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// Deprecated: Use Registry.RegisterInterfaceDecoder instead.
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func (rb *RegistryBuilder) RegisterHookDecoder(t reflect.Type, dec ValueDecoder) *RegistryBuilder {
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rb.registry.RegisterInterfaceDecoder(t, dec)
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return rb
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}
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// RegisterEncoder registers the provided type and encoder pair.
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//
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// Deprecated: Use Registry.RegisterTypeEncoder or Registry.RegisterInterfaceEncoder instead.
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func (rb *RegistryBuilder) RegisterEncoder(t reflect.Type, enc ValueEncoder) *RegistryBuilder {
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if t == tEmpty {
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rb.registry.RegisterTypeEncoder(t, enc)
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return rb
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}
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switch t.Kind() {
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case reflect.Interface:
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rb.registry.RegisterInterfaceEncoder(t, enc)
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default:
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rb.registry.RegisterTypeEncoder(t, enc)
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}
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return rb
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}
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// RegisterDecoder registers the provided type and decoder pair.
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//
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// Deprecated: Use Registry.RegisterTypeDecoder or Registry.RegisterInterfaceDecoder instead.
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func (rb *RegistryBuilder) RegisterDecoder(t reflect.Type, dec ValueDecoder) *RegistryBuilder {
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if t == nil {
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rb.registry.RegisterTypeDecoder(t, dec)
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return rb
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}
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if t == tEmpty {
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rb.registry.RegisterTypeDecoder(t, dec)
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return rb
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}
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switch t.Kind() {
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case reflect.Interface:
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rb.registry.RegisterInterfaceDecoder(t, dec)
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default:
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rb.registry.RegisterTypeDecoder(t, dec)
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}
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return rb
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}
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// RegisterDefaultEncoder will register the provided ValueEncoder to the provided
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// kind.
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//
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// Deprecated: Use Registry.RegisterKindEncoder instead.
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func (rb *RegistryBuilder) RegisterDefaultEncoder(kind reflect.Kind, enc ValueEncoder) *RegistryBuilder {
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rb.registry.RegisterKindEncoder(kind, enc)
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return rb
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}
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// RegisterDefaultDecoder will register the provided ValueDecoder to the
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// provided kind.
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//
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// Deprecated: Use Registry.RegisterKindDecoder instead.
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func (rb *RegistryBuilder) RegisterDefaultDecoder(kind reflect.Kind, dec ValueDecoder) *RegistryBuilder {
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rb.registry.RegisterKindDecoder(kind, dec)
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return rb
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}
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// RegisterTypeMapEntry will register the provided type to the BSON type. The primary usage for this
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// mapping is decoding situations where an empty interface is used and a default type needs to be
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// created and decoded into.
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//
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// By default, BSON documents will decode into interface{} values as bson.D. To change the default type for BSON
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// documents, a type map entry for bsontype.EmbeddedDocument should be registered. For example, to force BSON documents
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// to decode to bson.Raw, use the following code:
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//
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// rb.RegisterTypeMapEntry(bsontype.EmbeddedDocument, reflect.TypeOf(bson.Raw{}))
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//
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// Deprecated: Use Registry.RegisterTypeMapEntry instead.
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func (rb *RegistryBuilder) RegisterTypeMapEntry(bt bsontype.Type, rt reflect.Type) *RegistryBuilder {
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rb.registry.RegisterTypeMapEntry(bt, rt)
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return rb
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}
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// Build creates a Registry from the current state of this RegistryBuilder.
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//
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// Deprecated: Use NewRegistry instead.
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func (rb *RegistryBuilder) Build() *Registry {
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r := &Registry{
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interfaceEncoders: append([]interfaceValueEncoder(nil), rb.registry.interfaceEncoders...),
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interfaceDecoders: append([]interfaceValueDecoder(nil), rb.registry.interfaceDecoders...),
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typeEncoders: rb.registry.typeEncoders.Clone(),
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typeDecoders: rb.registry.typeDecoders.Clone(),
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kindEncoders: rb.registry.kindEncoders.Clone(),
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kindDecoders: rb.registry.kindDecoders.Clone(),
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}
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rb.registry.typeMap.Range(func(k, v interface{}) bool {
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if k != nil && v != nil {
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r.typeMap.Store(k, v)
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}
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return true
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})
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return r
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}
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// A Registry is used to store and retrieve codecs for types and interfaces. This type is the main
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// typed passed around and Encoders and Decoders are constructed from it.
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type Registry struct {
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interfaceEncoders []interfaceValueEncoder
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interfaceDecoders []interfaceValueDecoder
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typeEncoders *typeEncoderCache
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typeDecoders *typeDecoderCache
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kindEncoders *kindEncoderCache
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kindDecoders *kindDecoderCache
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typeMap sync.Map // map[bsontype.Type]reflect.Type
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}
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// NewRegistry creates a new empty Registry.
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func NewRegistry() *Registry {
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return &Registry{
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typeEncoders: new(typeEncoderCache),
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typeDecoders: new(typeDecoderCache),
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kindEncoders: new(kindEncoderCache),
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kindDecoders: new(kindDecoderCache),
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}
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}
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// RegisterTypeEncoder registers the provided ValueEncoder for the provided type.
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//
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// The type will be used as provided, so an encoder can be registered for a type and a different
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// encoder can be registered for a pointer to that type.
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//
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// If the given type is an interface, the encoder will be called when marshaling a type that is
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// that interface. It will not be called when marshaling a non-interface type that implements the
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// interface. To get the latter behavior, call RegisterHookEncoder instead.
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//
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// RegisterTypeEncoder should not be called concurrently with any other Registry method.
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func (r *Registry) RegisterTypeEncoder(valueType reflect.Type, enc ValueEncoder) {
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r.typeEncoders.Store(valueType, enc)
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}
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// RegisterTypeDecoder registers the provided ValueDecoder for the provided type.
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//
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// The type will be used as provided, so a decoder can be registered for a type and a different
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// decoder can be registered for a pointer to that type.
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//
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// If the given type is an interface, the decoder will be called when unmarshaling into a type that
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// is that interface. It will not be called when unmarshaling into a non-interface type that
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// implements the interface. To get the latter behavior, call RegisterHookDecoder instead.
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//
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// RegisterTypeDecoder should not be called concurrently with any other Registry method.
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func (r *Registry) RegisterTypeDecoder(valueType reflect.Type, dec ValueDecoder) {
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r.typeDecoders.Store(valueType, dec)
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}
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// RegisterKindEncoder registers the provided ValueEncoder for the provided kind.
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//
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// Use RegisterKindEncoder to register an encoder for any type with the same underlying kind. For
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// example, consider the type MyInt defined as
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//
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// type MyInt int32
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//
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// To define an encoder for MyInt and int32, use RegisterKindEncoder like
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//
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// reg.RegisterKindEncoder(reflect.Int32, myEncoder)
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//
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// RegisterKindEncoder should not be called concurrently with any other Registry method.
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func (r *Registry) RegisterKindEncoder(kind reflect.Kind, enc ValueEncoder) {
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r.kindEncoders.Store(kind, enc)
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}
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// RegisterKindDecoder registers the provided ValueDecoder for the provided kind.
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//
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// Use RegisterKindDecoder to register a decoder for any type with the same underlying kind. For
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// example, consider the type MyInt defined as
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//
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// type MyInt int32
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//
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// To define an decoder for MyInt and int32, use RegisterKindDecoder like
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//
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// reg.RegisterKindDecoder(reflect.Int32, myDecoder)
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//
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// RegisterKindDecoder should not be called concurrently with any other Registry method.
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func (r *Registry) RegisterKindDecoder(kind reflect.Kind, dec ValueDecoder) {
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r.kindDecoders.Store(kind, dec)
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}
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// RegisterInterfaceEncoder registers an encoder for the provided interface type iface. This encoder will
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// be called when marshaling a type if the type implements iface or a pointer to the type
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// implements iface. If the provided type is not an interface
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// (i.e. iface.Kind() != reflect.Interface), this method will panic.
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//
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// RegisterInterfaceEncoder should not be called concurrently with any other Registry method.
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func (r *Registry) RegisterInterfaceEncoder(iface reflect.Type, enc ValueEncoder) {
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if iface.Kind() != reflect.Interface {
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panicStr := fmt.Errorf("RegisterInterfaceEncoder expects a type with kind reflect.Interface, "+
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"got type %s with kind %s", iface, iface.Kind())
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panic(panicStr)
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}
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for idx, encoder := range r.interfaceEncoders {
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if encoder.i == iface {
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r.interfaceEncoders[idx].ve = enc
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return
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}
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}
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r.interfaceEncoders = append(r.interfaceEncoders, interfaceValueEncoder{i: iface, ve: enc})
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}
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// RegisterInterfaceDecoder registers an decoder for the provided interface type iface. This decoder will
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// be called when unmarshaling into a type if the type implements iface or a pointer to the type
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// implements iface. If the provided type is not an interface (i.e. iface.Kind() != reflect.Interface),
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// this method will panic.
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//
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// RegisterInterfaceDecoder should not be called concurrently with any other Registry method.
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func (r *Registry) RegisterInterfaceDecoder(iface reflect.Type, dec ValueDecoder) {
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if iface.Kind() != reflect.Interface {
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panicStr := fmt.Errorf("RegisterInterfaceDecoder expects a type with kind reflect.Interface, "+
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"got type %s with kind %s", iface, iface.Kind())
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panic(panicStr)
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}
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for idx, decoder := range r.interfaceDecoders {
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if decoder.i == iface {
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r.interfaceDecoders[idx].vd = dec
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return
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}
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}
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r.interfaceDecoders = append(r.interfaceDecoders, interfaceValueDecoder{i: iface, vd: dec})
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}
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// RegisterTypeMapEntry will register the provided type to the BSON type. The primary usage for this
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// mapping is decoding situations where an empty interface is used and a default type needs to be
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// created and decoded into.
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//
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// By default, BSON documents will decode into interface{} values as bson.D. To change the default type for BSON
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// documents, a type map entry for bsontype.EmbeddedDocument should be registered. For example, to force BSON documents
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// to decode to bson.Raw, use the following code:
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//
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// reg.RegisterTypeMapEntry(bsontype.EmbeddedDocument, reflect.TypeOf(bson.Raw{}))
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func (r *Registry) RegisterTypeMapEntry(bt bsontype.Type, rt reflect.Type) {
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r.typeMap.Store(bt, rt)
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}
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// LookupEncoder returns the first matching encoder in the Registry. It uses the following lookup
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// order:
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//
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// 1. An encoder registered for the exact type. If the given type is an interface, an encoder
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// registered using RegisterTypeEncoder for that interface will be selected.
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//
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// 2. An encoder registered using RegisterInterfaceEncoder for an interface implemented by the type
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// or by a pointer to the type.
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//
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// 3. An encoder registered using RegisterKindEncoder for the kind of value.
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//
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// If no encoder is found, an error of type ErrNoEncoder is returned. LookupEncoder is safe for
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// concurrent use by multiple goroutines after all codecs and encoders are registered.
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func (r *Registry) LookupEncoder(valueType reflect.Type) (ValueEncoder, error) {
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if valueType == nil {
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return nil, ErrNoEncoder{Type: valueType}
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}
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enc, found := r.lookupTypeEncoder(valueType)
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if found {
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if enc == nil {
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return nil, ErrNoEncoder{Type: valueType}
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}
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return enc, nil
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}
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enc, found = r.lookupInterfaceEncoder(valueType, true)
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if found {
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return r.typeEncoders.LoadOrStore(valueType, enc), nil
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}
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if v, ok := r.kindEncoders.Load(valueType.Kind()); ok {
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return r.storeTypeEncoder(valueType, v), nil
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}
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return nil, ErrNoEncoder{Type: valueType}
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}
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func (r *Registry) storeTypeEncoder(rt reflect.Type, enc ValueEncoder) ValueEncoder {
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return r.typeEncoders.LoadOrStore(rt, enc)
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}
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func (r *Registry) lookupTypeEncoder(rt reflect.Type) (ValueEncoder, bool) {
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return r.typeEncoders.Load(rt)
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}
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func (r *Registry) lookupInterfaceEncoder(valueType reflect.Type, allowAddr bool) (ValueEncoder, bool) {
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if valueType == nil {
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return nil, false
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}
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for _, ienc := range r.interfaceEncoders {
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if valueType.Implements(ienc.i) {
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return ienc.ve, true
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}
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if allowAddr && valueType.Kind() != reflect.Ptr && reflect.PtrTo(valueType).Implements(ienc.i) {
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// if *t implements an interface, this will catch if t implements an interface further
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// ahead in interfaceEncoders
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defaultEnc, found := r.lookupInterfaceEncoder(valueType, false)
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if !found {
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defaultEnc, _ = r.kindEncoders.Load(valueType.Kind())
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}
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return newCondAddrEncoder(ienc.ve, defaultEnc), true
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}
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}
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return nil, false
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}
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// LookupDecoder returns the first matching decoder in the Registry. It uses the following lookup
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// order:
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//
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// 1. A decoder registered for the exact type. If the given type is an interface, a decoder
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// registered using RegisterTypeDecoder for that interface will be selected.
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//
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// 2. A decoder registered using RegisterInterfaceDecoder for an interface implemented by the type or by
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// a pointer to the type.
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//
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// 3. A decoder registered using RegisterKindDecoder for the kind of value.
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//
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// If no decoder is found, an error of type ErrNoDecoder is returned. LookupDecoder is safe for
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// concurrent use by multiple goroutines after all codecs and decoders are registered.
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func (r *Registry) LookupDecoder(valueType reflect.Type) (ValueDecoder, error) {
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if valueType == nil {
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return nil, ErrNilType
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}
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dec, found := r.lookupTypeDecoder(valueType)
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if found {
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if dec == nil {
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return nil, ErrNoDecoder{Type: valueType}
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}
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return dec, nil
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}
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dec, found = r.lookupInterfaceDecoder(valueType, true)
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if found {
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return r.storeTypeDecoder(valueType, dec), nil
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}
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if v, ok := r.kindDecoders.Load(valueType.Kind()); ok {
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return r.storeTypeDecoder(valueType, v), nil
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}
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return nil, ErrNoDecoder{Type: valueType}
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}
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func (r *Registry) lookupTypeDecoder(valueType reflect.Type) (ValueDecoder, bool) {
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return r.typeDecoders.Load(valueType)
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}
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func (r *Registry) storeTypeDecoder(typ reflect.Type, dec ValueDecoder) ValueDecoder {
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|
return r.typeDecoders.LoadOrStore(typ, dec)
|
|
}
|
|
|
|
func (r *Registry) lookupInterfaceDecoder(valueType reflect.Type, allowAddr bool) (ValueDecoder, bool) {
|
|
for _, idec := range r.interfaceDecoders {
|
|
if valueType.Implements(idec.i) {
|
|
return idec.vd, true
|
|
}
|
|
if allowAddr && valueType.Kind() != reflect.Ptr && reflect.PtrTo(valueType).Implements(idec.i) {
|
|
// if *t implements an interface, this will catch if t implements an interface further
|
|
// ahead in interfaceDecoders
|
|
defaultDec, found := r.lookupInterfaceDecoder(valueType, false)
|
|
if !found {
|
|
defaultDec, _ = r.kindDecoders.Load(valueType.Kind())
|
|
}
|
|
return newCondAddrDecoder(idec.vd, defaultDec), true
|
|
}
|
|
}
|
|
return nil, false
|
|
}
|
|
|
|
// LookupTypeMapEntry inspects the registry's type map for a Go type for the corresponding BSON
|
|
// type. If no type is found, ErrNoTypeMapEntry is returned.
|
|
//
|
|
// LookupTypeMapEntry should not be called concurrently with any other Registry method.
|
|
func (r *Registry) LookupTypeMapEntry(bt bsontype.Type) (reflect.Type, error) {
|
|
v, ok := r.typeMap.Load(bt)
|
|
if v == nil || !ok {
|
|
return nil, ErrNoTypeMapEntry{Type: bt}
|
|
}
|
|
return v.(reflect.Type), nil
|
|
}
|
|
|
|
type interfaceValueEncoder struct {
|
|
i reflect.Type
|
|
ve ValueEncoder
|
|
}
|
|
|
|
type interfaceValueDecoder struct {
|
|
i reflect.Type
|
|
vd ValueDecoder
|
|
}
|