Struct prost_wkt_types::Any

pub struct Any {
    pub type_url: String,
    pub value: Vec<u8>,
}

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"
 }

Fields

type_url: String

A 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, 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.

value: Vec<u8>

Must be a valid serialized protocol buffer of the above specified type.

Implementations

impl Any

pub fn try_pack<T>(message: T) -> Result<Self, AnyError>

where T: Message + MessageSerde + Default,

Packs a message into an Any containing a type_url which will take the format of type.googleapis.com/package_name.struct_name, and a value containing the encoded message.

pub fn unpack_as<T: Message>(self, target: T) -> Result<T, AnyError>

Unpacks the contents of the Any into the provided message type. Example usage:

let back: Foo = any.unpack_as(Foo::default())?;

pub fn try_unpack(self) -> Result<Box<dyn MessageSerde>, AnyError>

Unpacks the contents of the Any into the MessageSerde trait object. Example usage:

let back: Box<dyn MessageSerde> = any.try_unpack()?;

pub fn from_msg<M>(msg: &M) -> Result<Self, EncodeError>

where M: Name,

From Prost’s Any implementation. Serialize the given message type M as Any.

pub fn to_msg<M>(&self) -> Result<M, DecodeError>

where M: Default + Name + Sized,

From Prost’s Any implementation. Decode the given message type M from Any, validating that it has the expected type URL.

Trait Implementations

impl Clone for Any

fn clone(&self) -> Any

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for Any

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for Any

fn default() -> Self

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for Any

fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>

where D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Message for Any

fn encoded_len(&self) -> usize

Returns the encoded length of the message without a length delimiter.

fn clear(&mut self)

Clears the message, resetting all fields to their default.

fn encode<B>(&self, buf: &mut B) -> Result<(), EncodeError>

where B: BufMut, Self: Sized,

Encodes the message to a buffer.

fn encode_to_vec(&self) -> Vec<u8>

where Self: Sized,

Encodes the message to a newly allocated buffer.

fn encode_length_delimited<B>(&self, buf: &mut B) -> Result<(), EncodeError>

where B: BufMut, Self: Sized,

Encodes the message with a length-delimiter to a buffer.

fn encode_length_delimited_to_vec(&self) -> Vec<u8>

where Self: Sized,

Encodes the message with a length-delimiter to a newly allocated buffer.

fn decode<B>(buf: B) -> Result<Self, DecodeError>

where B: Buf, Self: Default,

Decodes an instance of the message from a buffer.

fn decode_length_delimited<B>(buf: B) -> Result<Self, DecodeError>

where B: Buf, Self: Default,

Decodes a length-delimited instance of the message from the buffer.

fn merge<B>(&mut self, buf: B) -> Result<(), DecodeError>

where B: Buf, Self: Sized,

Decodes an instance of the message from a buffer, and merges it into self.

fn merge_length_delimited<B>(&mut self, buf: B) -> Result<(), DecodeError>

where B: Buf, Self: Sized,

Decodes a length-delimited instance of the message from buffer, and merges it into self.

impl MessageSerde for Any

fn package_name(&self) -> &'static str

package name as in proto file

fn message_name(&self) -> &'static str

message name as in proto file

fn type_url(&self) -> &'static str

the message proto type url e.g. type.googleapis.com/my.package.MyMessage

fn new_instance( &self, data: Vec<u8> ) -> Result<Box<dyn MessageSerde>, DecodeError>

Creates a new instance of this message using the protobuf encoded data

fn try_encoded(&self) -> Result<Vec<u8>, EncodeError>

Returns the encoded protobuf message as bytes

impl Name for Any

const PACKAGE: &'static str = "google.protobuf"

Package name this message type is contained in. They are domain-like and delimited by ., e.g. google.protobuf.

const NAME: &'static str = "Any"

Simple name for this Message. This name is the same as it appears in the source .proto file, e.g. FooBar.

fn type_url() -> String

Type URL for this Message, which by default is the full name with a leading slash, but may also include a leading domain name, e.g. type.googleapis.com/google.profile.Person. This can be used when serializing with the [Any] type.

fn full_name() -> String

Fully-qualified unique name for this Message. It’s prefixed with the package name and names of any parent messages, e.g. google.rpc.BadRequest.FieldViolation. By default, this is the package name followed by the message name. Fully-qualified names must be unique within a domain of Type URLs.

impl PartialEq for Any

fn eq(&self, other: &Any) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Serialize for Any

fn serialize<S>( &self, serializer: S ) -> Result<<S as Serializer>::Ok, <S as Serializer>::Error>

where S: Serializer,

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for Any