Back to godoc.org

Package structpb

v1.25.0
Latest Go to latest

The latest major version is .

Published: Jun 22, 2020 | License: BSD-3-Clause | Module: google.golang.org/protobuf

Overview

Package structpb contains generated types for google/protobuf/struct.proto.

The messages (i.e., Value, Struct, and ListValue) defined in struct.proto are used to represent arbitrary JSON. The Value message represents a JSON value, the Struct message represents a JSON object, and the ListValue message represents a JSON array. See https://json.org for more information.

The Value, Struct, and ListValue types have generated MarshalJSON and UnmarshalJSON methods such that they serialize JSON equivalent to what the messages themselves represent. Use of these types with the "google.golang.org/protobuf/encoding/protojson" package ensures that they will be serialized as their JSON equivalent.

Conversion to and from a Go interface

The standard Go "encoding/json" package has functionality to serialize arbitrary types to a large degree. The Value.AsInterface, Struct.AsMap, and ListValue.AsSlice methods can convert the protobuf message representation into a form represented by interface{}, map[string]interface{}, and []interface{}. This form can be used with other packages that operate on such data structures and also directly with the standard json package.

In order to convert the interface{}, map[string]interface{}, and []interface{} forms back as Value, Struct, and ListValue messages, use the NewStruct, NewList, and NewValue constructor functions.

Example usage

Consider the following example JSON object:

{
	"firstName": "John",
	"lastName": "Smith",
	"isAlive": true,
	"age": 27,
	"address": {
		"streetAddress": "21 2nd Street",
		"city": "New York",
		"state": "NY",
		"postalCode": "10021-3100"
	},
	"phoneNumbers": [
		{
			"type": "home",
			"number": "212 555-1234"
		},
		{
			"type": "office",
			"number": "646 555-4567"
		}
	],
	"children": [],
	"spouse": null
}

To construct a Value message representing the above JSON object:

m, err := structpb.NewValue(map[string]interface{}{
	"firstName": "John",
	"lastName":  "Smith",
	"isAlive":   true,
	"age":       27,
	"address": map[string]interface{}{
		"streetAddress": "21 2nd Street",
		"city":          "New York",
		"state":         "NY",
		"postalCode":    "10021-3100",
	},
	"phoneNumbers": []interface{}{
		map[string]interface{}{
			"type":   "home",
			"number": "212 555-1234",
		},
		map[string]interface{}{
			"type":   "office",
			"number": "646 555-4567",
		},
	},
	"children": []interface{}{},
	"spouse":   nil,
})
if err != nil {
	... // handle error
}
... // make use of m as a *structpb.Value

Index

Variables

var (
	NullValue_name = map[int32]string{
		0: "NULL_VALUE",
	}
	NullValue_value = map[string]int32{
		"NULL_VALUE": 0,
	}
)

Enum value maps for NullValue.

var File_google_protobuf_struct_proto protoreflect.FileDescriptor

type ListValue

type ListValue struct {

	// Repeated field of dynamically typed values.
	Values []*Value `protobuf:"bytes,1,rep,name=values,proto3" json:"values,omitempty"`
	// contains filtered or unexported fields
}

`ListValue` is a wrapper around a repeated field of values.

The JSON representation for `ListValue` is JSON array.

func NewList

func NewList(v []interface{}) (*ListValue, error)

NewList constructs a ListValue from a general-purpose Go slice. The slice elements are converted using NewValue.

func (*ListValue) AsSlice

func (x *ListValue) AsSlice() []interface{}

AsSlice converts x to a general-purpose Go slice. The slice elements are converted by calling Value.AsInterface.

func (*ListValue) Descriptor

func (*ListValue) Descriptor() ([]byte, []int)

Deprecated: Use ListValue.ProtoReflect.Descriptor instead.

func (*ListValue) GetValues

func (x *ListValue) GetValues() []*Value

func (*ListValue) MarshalJSON

func (x *ListValue) MarshalJSON() ([]byte, error)

func (*ListValue) ProtoMessage

func (*ListValue) ProtoMessage()

func (*ListValue) ProtoReflect

func (x *ListValue) ProtoReflect() protoreflect.Message

func (*ListValue) Reset

func (x *ListValue) Reset()

func (*ListValue) String

func (x *ListValue) String() string

func (*ListValue) UnmarshalJSON

func (x *ListValue) UnmarshalJSON(b []byte) error

type NullValue

type NullValue int32

`NullValue` is a singleton enumeration to represent the null value for the `Value` type union.

The JSON representation for `NullValue` is JSON `null`.
const (
	// Null value.
	NullValue_NULL_VALUE NullValue = 0
)

func (NullValue) Descriptor

func (NullValue) Descriptor() protoreflect.EnumDescriptor

func (NullValue) Enum

func (x NullValue) Enum() *NullValue

func (NullValue) EnumDescriptor

func (NullValue) EnumDescriptor() ([]byte, []int)

Deprecated: Use NullValue.Descriptor instead.

func (NullValue) Number

func (x NullValue) Number() protoreflect.EnumNumber

func (NullValue) String

func (x NullValue) String() string

func (NullValue) Type

func (NullValue) Type() protoreflect.EnumType

type Struct

type Struct struct {
	Fields map[string]*Value "" /* 153 byte string literal not displayed */

}

`Struct` represents a structured data value, consisting of fields which map to dynamically typed values. In some languages, `Struct` might be supported by a native representation. For example, in scripting languages like JS a struct is represented as an object. The details of that representation are described together with the proto support for the language.

The JSON representation for `Struct` is JSON object.

func NewStruct

func NewStruct(v map[string]interface{}) (*Struct, error)

NewStruct constructs a Struct from a general-purpose Go map. The map keys must be valid UTF-8. The map values are converted using NewValue.

func (*Struct) AsMap

func (x *Struct) AsMap() map[string]interface{}

AsMap converts x to a general-purpose Go map. The map values are converted by calling Value.AsInterface.

func (*Struct) Descriptor

func (*Struct) Descriptor() ([]byte, []int)

Deprecated: Use Struct.ProtoReflect.Descriptor instead.

func (*Struct) GetFields

func (x *Struct) GetFields() map[string]*Value

func (*Struct) MarshalJSON

func (x *Struct) MarshalJSON() ([]byte, error)

func (*Struct) ProtoMessage

func (*Struct) ProtoMessage()

func (*Struct) ProtoReflect

func (x *Struct) ProtoReflect() protoreflect.Message

func (*Struct) Reset

func (x *Struct) Reset()

func (*Struct) String

func (x *Struct) String() string

func (*Struct) UnmarshalJSON

func (x *Struct) UnmarshalJSON(b []byte) error

type Value

type Value struct {

	// The kind of value.
	//
	// Types that are assignable to Kind:
	//	*Value_NullValue
	//	*Value_NumberValue
	//	*Value_StringValue
	//	*Value_BoolValue
	//	*Value_StructValue
	//	*Value_ListValue
	Kind isValue_Kind `protobuf_oneof:"kind"`
	// contains filtered or unexported fields
}

`Value` represents a dynamically typed value which can be either null, a number, a string, a boolean, a recursive struct value, or a list of values. A producer of value is expected to set one of that variants, absence of any variant indicates an error.

The JSON representation for `Value` is JSON value.

func NewBoolValue

func NewBoolValue(v bool) *Value

NewBoolValue constructs a new boolean Value.

func NewListValue

func NewListValue(v *ListValue) *Value

NewListValue constructs a new list Value.

func NewNullValue

func NewNullValue() *Value

NewNullValue constructs a new null Value.

func NewNumberValue

func NewNumberValue(v float64) *Value

NewNumberValue constructs a new number Value.

func NewStringValue

func NewStringValue(v string) *Value

NewStringValue constructs a new string Value.

func NewStructValue

func NewStructValue(v *Struct) *Value

NewStructValue constructs a new struct Value.

func NewValue

func NewValue(v interface{}) (*Value, error)

NewValue constructs a Value from a general-purpose Go interface.

╔════════════════════════╤════════════════════════════════════════════╗
║ Go type                │ Conversion                                 ║
╠════════════════════════╪════════════════════════════════════════════╣
║ nil                    │ stored as NullValue                        ║
║ bool                   │ stored as BoolValue                        ║
║ int, int32, int64      │ stored as NumberValue                      ║
║ uint, uint32, uint64   │ stored as NumberValue                      ║
║ float32, float64       │ stored as NumberValue                      ║
║ string                 │ stored as StringValue; must be valid UTF-8 ║
║ []byte                 │ stored as StringValue; base64-encoded      ║
║ map[string]interface{} │ stored as StructValue                      ║
║ []interface{}          │ stored as ListValue                        ║
╚════════════════════════╧════════════════════════════════════════════╝

When converting an int64 or uint64 to a NumberValue, numeric precision loss is possible since they are stored as a float64.

func (*Value) AsInterface

func (x *Value) AsInterface() interface{}

AsInterface converts x to a general-purpose Go interface.

Calling Value.MarshalJSON and "encoding/json".Marshal on this output produce semantically equivalent JSON (assuming no errors occur).

Floating-point values (i.e., "NaN", "Infinity", and "-Infinity") are converted as strings to remain compatible with MarshalJSON.

func (*Value) Descriptor

func (*Value) Descriptor() ([]byte, []int)

Deprecated: Use Value.ProtoReflect.Descriptor instead.

func (*Value) GetBoolValue

func (x *Value) GetBoolValue() bool

func (*Value) GetKind

func (m *Value) GetKind() isValue_Kind

func (*Value) GetListValue

func (x *Value) GetListValue() *ListValue

func (*Value) GetNullValue

func (x *Value) GetNullValue() NullValue

func (*Value) GetNumberValue

func (x *Value) GetNumberValue() float64

func (*Value) GetStringValue

func (x *Value) GetStringValue() string

func (*Value) GetStructValue

func (x *Value) GetStructValue() *Struct

func (*Value) MarshalJSON

func (x *Value) MarshalJSON() ([]byte, error)

func (*Value) ProtoMessage

func (*Value) ProtoMessage()

func (*Value) ProtoReflect

func (x *Value) ProtoReflect() protoreflect.Message

func (*Value) Reset

func (x *Value) Reset()

func (*Value) String

func (x *Value) String() string

func (*Value) UnmarshalJSON

func (x *Value) UnmarshalJSON(b []byte) error

type Value_BoolValue

type Value_BoolValue struct {
	// Represents a boolean value.
	BoolValue bool `protobuf:"varint,4,opt,name=bool_value,json=boolValue,proto3,oneof"`
}

type Value_ListValue

type Value_ListValue struct {
	// Represents a repeated `Value`.
	ListValue *ListValue `protobuf:"bytes,6,opt,name=list_value,json=listValue,proto3,oneof"`
}

type Value_NullValue

type Value_NullValue struct {
	// Represents a null value.
	NullValue NullValue `protobuf:"varint,1,opt,name=null_value,json=nullValue,proto3,enum=google.protobuf.NullValue,oneof"`
}

type Value_NumberValue

type Value_NumberValue struct {
	// Represents a double value.
	NumberValue float64 `protobuf:"fixed64,2,opt,name=number_value,json=numberValue,proto3,oneof"`
}

type Value_StringValue

type Value_StringValue struct {
	// Represents a string value.
	StringValue string `protobuf:"bytes,3,opt,name=string_value,json=stringValue,proto3,oneof"`
}

type Value_StructValue

type Value_StructValue struct {
	// Represents a structured value.
	StructValue *Struct `protobuf:"bytes,5,opt,name=struct_value,json=structValue,proto3,oneof"`
}

Package Files

Documentation was rendered with GOOS=linux and GOARCH=amd64.

Jump to identifier

Keyboard shortcuts

? : This menu
/ : Search site
f or F : Jump to identifier