structpb

package
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 Go to latest Published: Nov 26, 2020 License: BSD-3-Clause Imports: 8 Imported by: 1

Documentation

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

Constants

This section is empty.

Variables

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

Enum value maps for NullValue.

View Source 
var File_google_protobuf_struct_proto protoreflect.FileDescriptor

Functions

This section is empty.

Types

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 deprecated 

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 deprecated 

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 {

	// Unordered map of dynamically typed values.
	Fields map[string]*Value `` /* 153-byte string literal not displayed */
	// contains filtered or unexported fields
}

`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 deprecated 

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 deprecated 

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"`
}

Source Files

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