Expand description
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 := anypb.New(foo)
if err != nil {
…
}
…
foo := &pb.Foo{}
if err := any.UnmarshalTo(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”: 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”
}
Fields
type_url: StringA URL/resource name that uniquely identifies the type of the serialized
protocol buffer message. This string must contain at least
one “/” character. 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,
httpsis 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.
value: Vec<u8>Must be a valid serialized protocol buffer of the above specified type.
Trait Implementations
sourceimpl<'de> Deserialize<'de> for Any
impl<'de> Deserialize<'de> for Any
sourcefn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>where
__D: Deserializer<'de>,
fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>where
__D: Deserializer<'de>,
sourceimpl Message for Any
impl Message for Any
sourcefn encoded_len(&self) -> usize
fn encoded_len(&self) -> usize
sourcefn encode<B>(&self, buf: &mut B) -> Result<(), EncodeError>where
B: BufMut,
Self: Sized,
fn encode<B>(&self, buf: &mut B) -> Result<(), EncodeError>where
B: BufMut,
Self: Sized,
sourcefn encode_to_vec(&self) -> Vec<u8, Global>where
Self: Sized,
fn encode_to_vec(&self) -> Vec<u8, Global>where
Self: Sized,
sourcefn encode_length_delimited<B>(&self, buf: &mut B) -> Result<(), EncodeError>where
B: BufMut,
Self: Sized,
fn encode_length_delimited<B>(&self, buf: &mut B) -> Result<(), EncodeError>where
B: BufMut,
Self: Sized,
sourcefn encode_length_delimited_to_vec(&self) -> Vec<u8, Global>where
Self: Sized,
fn encode_length_delimited_to_vec(&self) -> Vec<u8, Global>where
Self: Sized,
sourcefn decode<B>(buf: B) -> Result<Self, DecodeError>where
B: Buf,
Self: Default,
fn decode<B>(buf: B) -> Result<Self, DecodeError>where
B: Buf,
Self: Default,
sourcefn decode_length_delimited<B>(buf: B) -> Result<Self, DecodeError>where
B: Buf,
Self: Default,
fn decode_length_delimited<B>(buf: B) -> Result<Self, DecodeError>where
B: Buf,
Self: Default,
sourcefn merge<B>(&mut self, buf: B) -> Result<(), DecodeError>where
B: Buf,
Self: Sized,
fn merge<B>(&mut self, buf: B) -> Result<(), DecodeError>where
B: Buf,
Self: Sized,
self. Read moresourcefn merge_length_delimited<B>(&mut self, buf: B) -> Result<(), DecodeError>where
B: Buf,
Self: Sized,
fn merge_length_delimited<B>(&mut self, buf: B) -> Result<(), DecodeError>where
B: Buf,
Self: Sized,
self. Read moreimpl StructuralPartialEq for Any
Auto Trait Implementations
impl RefUnwindSafe for Any
impl Send for Any
impl Sync for Any
impl Unpin for Any
impl UnwindSafe for Any
Blanket Implementations
sourceimpl<T> BorrowMut<T> for Twhere
T: ?Sized,
impl<T> BorrowMut<T> for Twhere
T: ?Sized,
const: unstable · sourcefn borrow_mut(&mut self) -> &mut T
fn borrow_mut(&mut self) -> &mut T
sourceimpl<T> Instrument for T
impl<T> Instrument for T
sourcefn instrument(self, span: Span) -> Instrumented<Self>
fn instrument(self, span: Span) -> Instrumented<Self>
sourcefn in_current_span(self) -> Instrumented<Self>
fn in_current_span(self) -> Instrumented<Self>
sourceimpl<T> IntoRequest<T> for T
impl<T> IntoRequest<T> for T
sourcefn into_request(self) -> Request<T>
fn into_request(self) -> Request<T>
T in a tonic::Request