Documentation ¶
Index ¶
- type Any
- func (*Any) Descriptor() ([]byte, []int)
- func (m *Any) GetTypeUrl() string
- func (m *Any) GetValue() []byte
- func (*Any) ProtoMessage()
- func (m *Any) Reset()
- func (m *Any) String() string
- func (m *Any) XXX_DiscardUnknown()
- func (m *Any) XXX_Marshal(b []byte, deterministic bool) ([]byte, error)
- func (m *Any) XXX_Merge(src proto.Message)
- func (m *Any) XXX_Size() int
- func (m *Any) XXX_Unmarshal(b []byte) error
- func (*Any) XXX_WellKnownType() string
Constants ¶
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Variables ¶
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Functions ¶
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Types ¶
type Any ¶
type Any struct { // A URL/resource name that uniquely identifies the type of the serialized // protocol buffer message. The last segment of the URL's path must represent // the fully qualified name of the type (as in // `path/google.protobuf.Duration`). The name should be in a canonical form // (e.g., leading "." is not accepted). // // In practice, teams usually precompile into the binary all types that they // expect it to use in the context of Any. However, for URLs which use the // scheme `http`, `https`, or no scheme, one can optionally set up a type // server that maps type URLs to message definitions as follows: // // * If no scheme is provided, `https` is assumed. // * An HTTP GET on the URL must yield a [google.protobuf.Type][] // value in binary format, or produce an error. // * Applications are allowed to cache lookup results based on the // URL, or have them precompiled into a binary to avoid any // lookup. Therefore, binary compatibility needs to be preserved // on changes to types. (Use versioned type names to manage // breaking changes.) // // Note: this functionality is not currently available in the official // protobuf release, and it is not used for type URLs beginning with // type.googleapis.com. // // Schemes other than `http`, `https` (or the empty scheme) might be // used with implementation specific semantics. // TypeUrl string `protobuf:"bytes,1,opt,name=type_url,json=typeUrl,proto3" json:"type_url,omitempty"` // Must be a valid serialized protocol buffer of the above specified type. Value []byte `protobuf:"bytes,2,opt,name=value,proto3" json:"value,omitempty"` XXX_NoUnkeyedLiteral struct{} `json:"-"` XXX_unrecognized []byte `json:"-"` XXX_sizecache int32 `json:"-"` }
`Any` contains an arbitrary serialized protocol buffer message along with a URL that describes the type of the serialized message.
Protobuf library provides support to pack/unpack Any values in the form of utility functions or additional generated methods of the Any type.
Example 1: Pack and unpack a message in C++.
Foo foo = ...; Any any; any.PackFrom(foo); ... if (any.UnpackTo(&foo)) { ... }
Example 2: Pack and unpack a message in Java.
Foo foo = ...; Any any = Any.pack(foo); ... if (any.is(Foo.class)) { foo = any.unpack(Foo.class); } Example 3: Pack and unpack a message in Python. foo = Foo(...) any = Any() any.Pack(foo) ... if any.Is(Foo.DESCRIPTOR): any.Unpack(foo) ... Example 4: Pack and unpack a message in Go foo := &pb.Foo{...} any, err := ptypes.MarshalAny(foo) ... foo := &pb.Foo{} if err := ptypes.UnmarshalAny(any, foo); err != nil { ... }
The pack methods provided by protobuf library will by default use 'type.googleapis.com/full.type.name' as the type URL and the unpack methods only use the fully qualified type name after the last '/' in the type URL, for example "foo.bar.com/x/y.z" will yield type name "y.z".
JSON ==== The JSON representation of an `Any` value uses the regular representation of the deserialized, embedded message, with an additional field `@type` which contains the type URL. Example:
package google.profile; message Person { string first_name = 1; string last_name = 2; } { "@type": "type.googleapis.com/google.profile.Person", "firstName": <string>, "lastName": <string> }
If the embedded message type is well-known and has a custom JSON representation, that representation will be embedded adding a field `value` which holds the custom JSON in addition to the `@type` field. Example (for message [google.protobuf.Duration][]):
{ "@type": "type.googleapis.com/google.protobuf.Duration", "value": "1.212s" }