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); } // or ... if (any.isSameTypeAs(Foo.getDefaultInstance())) { foo = any.unpack(Foo.getDefaultInstance()); }
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": <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"
}| Method | __init__ |
Create a message from a source message and field values. |
| Method | type |
Set or clear the generated type_url field. |
| Method | value |
Set or clear the generated value field. |
| Property | type |
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 ... |
| Property | value |
Must be a valid serialized protocol buffer of the above specified type. |
Inherited from Message:
| Class Method | from |
Create a message from protobuf JSON mapping. |
| Class Method | |
Create a message by parsing protobuf wire-format bytes. |
| Class Method | get |
Return the message descriptor from the registry. |
| Class Method | is |
Return True if a Python field contains credentials. |
| Class Method | is |
Return True if a Python field has the sensitive annotation. |
| Method | __dir__ |
List generated fields, oneofs, and nested declarations. |
| Method | __repr__ |
Render non-default fields without disclosing annotated secrets. |
| Method | |
Return the serialized protobuf wire size in bytes. |
| Method | check |
Check presence using a generated Python field name. |
| Method | |
Clear all fields, extensions, unknown fields, and the reset mask. |
| Method | clear |
Clear an extension value. |
| Method | |
Clear a protobuf field or oneof and record it in the reset mask. |
| Method | |
Replace this message with an independent copy of another message. |
| Method | |
Return paths of missing required fields. |
| Method | get |
Return an extension value. |
| Method | get |
Create a reset mask from the current protobuf state. |
| Method | get |
Return the reset mask for field changes. |
| Method | has |
Return True if an extension has explicit presence. |
| Method | |
Return True if a protobuf field or oneof has explicit presence. |
| Method | is |
Return True if a generated field has its default value. |
| Method | |
Return True if every required field is initialized. |
| Method | |
Merge fields from another message of the same generated type. |
| Method | |
Merge protobuf wire-format bytes into this message. |
| Method | |
Parse protobuf wire-format bytes and replace this message. |
| Method | |
Serialize the message using protobuf wire format. |
| Method | set |
Set an extension value. |
| Method | set |
Set the reset mask for this message. |
| Method | to |
Serialize this message using protobuf JSON mapping. |
| Method | which |
Return the selected Python field name for a protobuf oneof. |
| Method | |
Return the selected protobuf field name for a oneof. |
| Constant | __DEPRECATION |
Undocumented |
| Constant | __EXTENSION |
Registry that decodes protobuf extensions. |
| Constant | __FIELDS__ |
Runtime field data that the generator creates. |
| Constant | __MAX |
Maximum protobuf nesting depth for serialization, parsing, and initialization checks. |
| Constant | __PB2 |
Alias for code that expects a protobuf descriptor. |
| Constant | __PROTO |
Message descriptor from the registry. |
| Constant | __PY |
Mapping from Python names to protobuf names. |
| Constant | __REGISTRY__ |
Registry for the message and its descriptor. |
| Class Variable | __PROTO |
Fully qualified protobuf message name. |
| Property | |
Provide protobuf-compatible mapping access to extension values. |
| Class Method | _fields |
Undocumented |
| Class Method | _fields |
Undocumented |
| Class Method | _fields |
Undocumented |
| Class Method | _from |
Deserialize internally without invoking generated user warnings. |
| Class Method | _oneof |
Undocumented |
| Class Method | _public |
Undocumented |
| Class Method | _public |
Undocumented |
| Static Method | _format |
Undocumented |
| Static Method | _repr |
Undocumented |
| Method | _bind |
Undocumented |
| Method | _bind |
Undocumented |
| Method | _check |
Undocumented |
| Method | _child |
Undocumented |
| Method | _clear |
Undocumented |
| Method | _closed |
Undocumented |
| Method | _converted |
Undocumented |
| Method | _decode |
Undocumented |
| Method | _detach |
Undocumented |
| Method | _field |
Undocumented |
| Method | _field |
Undocumented |
| Method | _find |
Undocumented |
| Method | _get |
Undocumented |
| Method | _initialize |
Initialize message state, optionally suppressing generated warnings. |
| Method | _map |
Undocumented |
| Method | _merge |
Undocumented |
| Method | _nesting |
Undocumented |
| Method | _notify |
Undocumented |
| Method | _record |
Undocumented |
| Method | _repeated |
Undocumented |
| Method | _select |
Undocumented |
| Method | _serialize |
Undocumented |
| Method | _set |
Undocumented |
| Method | _suspend |
Undocumented |
| Method | _suspend |
Undocumented |
| Method | _try |
Undocumented |
| Method | _write |
Undocumented |
| Instance Variable | _extensions |
Undocumented |
| Instance Variable | _mutation |
Undocumented |
| Instance Variable | _on |
Undocumented |
| Instance Variable | _oneofs |
Undocumented |
| Instance Variable | _present |
Undocumented |
| Instance Variable | _reset |
Undocumented |
| Instance Variable | _reset |
Undocumented |
| Instance Variable | _unknown |
Undocumented |
| Instance Variable | _values |
Undocumented |
| Instance Variable | _views |
Undocumented |
SerializableMessage | None = None, *, type_url: str | None | UnsetType = ..., value: bytes | None | UnsetType = ...):
(source)
¶
Create a message from a source message and field values.
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. As of May 2023, there are no widely used type server implementations and no plans to implement one.
Schemes other than http, https (or the empty scheme) might be used with implementation specific semantics.