pb

package
v0.12.2 Latest Latest
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 Go to latest Published: Jul 12, 2022 License: Apache-2.0, BSD-3-Clause Imports: 15 Imported by: 12

Documentation

Overview

Package pb reflects over protocol buffer descriptors to generate objects that simplify type, enum, and field lookup.

Index

Constants

This section is empty.

Variables

View Source 
var (
	// CheckedPrimitives map from proto field descriptor type to expr.Type.
	CheckedPrimitives = map[protoreflect.Kind]*exprpb.Type{
		protoreflect.BoolKind:     checkedBool,
		protoreflect.BytesKind:    checkedBytes,
		protoreflect.DoubleKind:   checkedDouble,
		protoreflect.FloatKind:    checkedDouble,
		protoreflect.Int32Kind:    checkedInt,
		protoreflect.Int64Kind:    checkedInt,
		protoreflect.Sint32Kind:   checkedInt,
		protoreflect.Sint64Kind:   checkedInt,
		protoreflect.Uint32Kind:   checkedUint,
		protoreflect.Uint64Kind:   checkedUint,
		protoreflect.Fixed32Kind:  checkedUint,
		protoreflect.Fixed64Kind:  checkedUint,
		protoreflect.Sfixed32Kind: checkedInt,
		protoreflect.Sfixed64Kind: checkedInt,
		protoreflect.StringKind:   checkedString}

	// CheckedWellKnowns map from qualified proto type name to expr.Type for
	// well-known proto types.
	CheckedWellKnowns = map[string]*exprpb.Type{

		"google.protobuf.BoolValue":   checkedWrap(checkedBool),
		"google.protobuf.BytesValue":  checkedWrap(checkedBytes),
		"google.protobuf.DoubleValue": checkedWrap(checkedDouble),
		"google.protobuf.FloatValue":  checkedWrap(checkedDouble),
		"google.protobuf.Int64Value":  checkedWrap(checkedInt),
		"google.protobuf.Int32Value":  checkedWrap(checkedInt),
		"google.protobuf.UInt64Value": checkedWrap(checkedUint),
		"google.protobuf.UInt32Value": checkedWrap(checkedUint),
		"google.protobuf.StringValue": checkedWrap(checkedString),

		"google.protobuf.Any":       checkedAny,
		"google.protobuf.Duration":  checkedDuration,
		"google.protobuf.Timestamp": checkedTimestamp,

		"google.protobuf.ListValue": checkedListDyn,
		"google.protobuf.NullValue": checkedNull,
		"google.protobuf.Struct":    checkedMapStringDyn,
		"google.protobuf.Value":     checkedDyn,
	}
)
View Source 
var (
	// DefaultDb used at evaluation time or unless overridden at check time.
	DefaultDb = &Db{
		revFileDescriptorMap: make(map[string]*FileDescription),
		files:                []*FileDescription{},
	}
)

Functions

func CollectFileDescriptorSet added in v0.4.0 

func CollectFileDescriptorSet(message proto.Message) map[string]protoreflect.FileDescriptor

CollectFileDescriptorSet builds a file descriptor set associated with the file where the input message is declared.

func Equal added in v0.10.0 

func Equal(x, y proto.Message) bool

Equal returns whether two proto.Message instances are equal using the following criteria:

  • Messages must share the same instance of the type descriptor
  • Known set fields are compared using semantics equality
  • Bytes are compared using bytes.Equal
  • Scalar values are compared with operator ==
  • List and map types are equal if they have the same length and all elements are equal
  • Messages are equal if they share the same descriptor and all set fields are equal
  • Unknown fields are compared using byte equality
  • NaN values are not equal to each other
  • google.protobuf.Any values are unpacked before comparison
  • If the type descriptor for a protobuf.Any cannot be found, byte equality is used rather than semantic equality.

This method of proto equality mirrors the behavior of the C++ protobuf MessageDifferencer whereas the golang proto.Equal implementation mirrors the Java protobuf equals() methods behaviors which needed to treat NaN values as equal due to Java semantics.

func Merge added in v0.11.3 

func Merge(dstPB, srcPB proto.Message) error

Merge will copy the source proto message into the destination, or error if the merge cannot be completed.

Unlike the proto.Merge, this method will fallback to proto.Marshal/Unmarshal of the two proto messages do not share the same instance of their type descriptor.

Types

type Db added in v0.2.0 

type Db struct {
	// contains filtered or unexported fields
}

Db maps from file / message / enum name to file description.

Each Db is isolated from each other, and while information about protobuf descriptors may be fetched from the global protobuf registry, no descriptors are added to this registry, else the isolation guarantees of the Db object would be violated.

func NewDb added in v0.2.0 

func NewDb() *Db

NewDb creates a new `pb.Db` with an empty type name to file description map.

func (*Db) Copy added in v0.4.2 

func (pbdb *Db) Copy() *Db

Copy creates a copy of the current database with its own internal descriptor mapping.

func (*Db) DescribeEnum added in v0.2.0 

func (pbdb *Db) DescribeEnum(enumName string) (*EnumValueDescription, bool)

DescribeEnum takes a qualified enum name and returns an `EnumDescription` if it exists in the `pb.Db`.

func (*Db) DescribeType added in v0.2.0 

func (pbdb *Db) DescribeType(typeName string) (*TypeDescription, bool)

DescribeType returns a `TypeDescription` for the `typeName` if it exists in the `pb.Db`.

func (*Db) FileDescriptions added in v0.7.0 

func (pbdb *Db) FileDescriptions() []*FileDescription

FileDescriptions returns the set of file descriptions associated with this db.

func (*Db) RegisterDescriptor added in v0.2.0 

func (pbdb *Db) RegisterDescriptor(fileDesc protoreflect.FileDescriptor) (*FileDescription, error)

RegisterDescriptor produces a `FileDescription` from a `FileDescriptor` and registers the message and enum types into the `pb.Db`.

func (*Db) RegisterMessage added in v0.2.0 

func (pbdb *Db) RegisterMessage(message proto.Message) (*FileDescription, error)

RegisterMessage produces a `FileDescription` from a `message` and registers the message and all other definitions within the message file into the `pb.Db`.

type EnumValueDescription added in v0.4.1 

type EnumValueDescription struct {
	// contains filtered or unexported fields
}

EnumValueDescription maps a fully-qualified enum value name to its numeric value.

func NewEnumValueDescription added in v0.4.1 

func NewEnumValueDescription(name string, desc protoreflect.EnumValueDescriptor) *EnumValueDescription

NewEnumValueDescription produces an enum value description with the fully qualified enum value name and the enum value descriptor.

func (*EnumValueDescription) Name added in v0.4.1 

func (ed *EnumValueDescription) Name() string

Name returns the fully-qualified identifier name for the enum value.

func (*EnumValueDescription) Value added in v0.4.1 

func (ed *EnumValueDescription) Value() int32

Value returns the (numeric) value of the enum.

type FieldDescription 

type FieldDescription struct {
	// KeyType holds the key FieldDescription for map fields.
	KeyType *FieldDescription
	// ValueType holds the value FieldDescription for map fields.
	ValueType *FieldDescription
	// contains filtered or unexported fields
}

FieldDescription holds metadata related to fields declared within a type.

func NewFieldDescription added in v0.7.0 

func NewFieldDescription(fieldDesc protoreflect.FieldDescriptor) *FieldDescription

NewFieldDescription creates a new field description from a protoreflect.FieldDescriptor.

func (*FieldDescription) CheckedType 

func (fd *FieldDescription) CheckedType() *exprpb.Type

CheckedType returns the type-definition used at type-check time.

func (*FieldDescription) Descriptor added in v0.7.0 

func (fd *FieldDescription) Descriptor() protoreflect.FieldDescriptor

Descriptor returns the protoreflect.FieldDescriptor for this type.

func (*FieldDescription) GetFrom added in v0.4.0 

func (fd *FieldDescription) GetFrom(target interface{}) (interface{}, error)

GetFrom returns the accessor method associated with the field on the proto generated struct.

If the field is not set, the proto default value is returned instead.

This function implements the FieldType.GetFrom function contract which can be used to operate on more than just protobuf field accesses; however, the target here must be a protobuf.Message.

func (*FieldDescription) IsEnum 

func (fd *FieldDescription) IsEnum() bool

IsEnum returns true if the field type refers to an enum value.

func (*FieldDescription) IsList added in v0.7.0 

func (fd *FieldDescription) IsList() bool

IsList returns true if the field is a repeated value.

This method will also return true for map values, so check whether the field is also a map.

func (*FieldDescription) IsMap 

func (fd *FieldDescription) IsMap() bool

IsMap returns true if the field is of map type.

func (*FieldDescription) IsMessage 

func (fd *FieldDescription) IsMessage() bool

IsMessage returns true if the field is of message type.

func (*FieldDescription) IsOneof 

func (fd *FieldDescription) IsOneof() bool

IsOneof returns true if the field is declared within a oneof block.

func (*FieldDescription) IsSet added in v0.4.0 

func (fd *FieldDescription) IsSet(target interface{}) bool

IsSet returns whether the field is set on the target value, per the proto presence conventions of proto2 or proto3 accordingly.

This function implements the FieldType.IsSet function contract which can be used to operate on more than just protobuf field accesses; however, the target here must be a protobuf.Message.

func (*FieldDescription) MaybeUnwrapDynamic added in v0.7.0 

func (fd *FieldDescription) MaybeUnwrapDynamic(msg protoreflect.Message) (interface{}, bool, error)

MaybeUnwrapDynamic takes the reflected protoreflect.Message and determines whether the value can be unwrapped to a more primitive CEL type.

This function returns the unwrapped value and 'true' on success, or the original value and 'false' otherwise.

func (*FieldDescription) Name 

func (fd *FieldDescription) Name() string

Name returns the CamelCase name of the field within the proto-based struct.

func (*FieldDescription) ReflectType added in v0.7.0 

func (fd *FieldDescription) ReflectType() reflect.Type

ReflectType returns the Golang reflect.Type for this field.

func (*FieldDescription) String 

func (fd *FieldDescription) String() string

String returns the fully qualified name of the field within its type as well as whether the field occurs within a oneof.

func (*FieldDescription) Zero added in v0.7.0 

func (fd *FieldDescription) Zero() proto.Message

Zero returns the zero value for the protobuf message represented by this field.

If the field is not a proto.Message type, the zero value is nil.

type FileDescription 

type FileDescription struct {
	// contains filtered or unexported fields
}

FileDescription holds a map of all types and enum values declared within a proto file.

func NewFileDescription added in v0.4.1 

func NewFileDescription(fileDesc protoreflect.FileDescriptor, pbdb *Db) *FileDescription

NewFileDescription returns a FileDescription instance with a complete listing of all the message types and enum values declared within any scope in the file.

func (*FileDescription) GetEnumDescription 

func (fd *FileDescription) GetEnumDescription(enumName string) (*EnumValueDescription, bool)

GetEnumDescription returns an EnumDescription for a qualified enum value name declared within the .proto file.

func (*FileDescription) GetEnumNames 

func (fd *FileDescription) GetEnumNames() []string

GetEnumNames returns the string names of all enum values in the file.

func (*FileDescription) GetTypeDescription 

func (fd *FileDescription) GetTypeDescription(typeName string) (*TypeDescription, bool)

GetTypeDescription returns a TypeDescription for a qualified protobuf message type name declared within the .proto file.

func (*FileDescription) GetTypeNames 

func (fd *FileDescription) GetTypeNames() []string

GetTypeNames returns the list of all type names contained within the file.

type Map added in v0.7.0 

type Map struct {
	protoreflect.Map
	KeyType   *FieldDescription
	ValueType *FieldDescription
}

Map wraps the protoreflect.Map object with a key and value FieldDescription for use in retrieving individual elements within CEL value data types.

type TypeDescription 

type TypeDescription struct {
	// contains filtered or unexported fields
}

TypeDescription is a collection of type metadata relevant to expression checking and evaluation.

func NewTypeDescription added in v0.4.1 

func NewTypeDescription(typeName string, desc protoreflect.MessageDescriptor) *TypeDescription

NewTypeDescription produces a TypeDescription value for the fully-qualified proto type name with a given descriptor.

func (*TypeDescription) FieldByName 

func (td *TypeDescription) FieldByName(name string) (*FieldDescription, bool)

FieldByName returns (FieldDescription, true) if the field name is declared within the type.

func (*TypeDescription) FieldMap added in v0.7.0 

func (td *TypeDescription) FieldMap() map[string]*FieldDescription

FieldMap returns a string field name to FieldDescription map.

func (*TypeDescription) MaybeUnwrap added in v0.7.0 

func (td *TypeDescription) MaybeUnwrap(msg proto.Message) (interface{}, bool, error)

MaybeUnwrap accepts a proto message as input and unwraps it to a primitive CEL type if possible.

This method returns the unwrapped value and 'true', else the original value and 'false'.

func (*TypeDescription) Name 

func (td *TypeDescription) Name() string

Name returns the fully-qualified name of the type.

func (*TypeDescription) New added in v0.7.0 

func (td *TypeDescription) New() protoreflect.Message

New returns a mutable proto message

func (*TypeDescription) ReflectType 

func (td *TypeDescription) ReflectType() reflect.Type

ReflectType returns the Golang reflect.Type for this type.

func (*TypeDescription) Zero added in v0.7.0 

func (td *TypeDescription) Zero() proto.Message

Zero returns the zero proto.Message value for this type.

Source Files

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