annotations

package
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 Go to latest Published: Jun 19, 2019 License: Apache-2.0, Apache-2.0 Imports: 4 Imported by: 0

Documentation

Overview

Package annotations is a generated protocol buffer package.

It is generated from these files: 

google/api/annotations.proto
google/api/http.proto

It has these top-level messages: 

Http
HttpRule
CustomHttpPattern

Index

Constants

This section is empty.

Variables

View Source 
var E_Http = &proto.ExtensionDesc{
	ExtendedType:  (*google_protobuf.MethodOptions)(nil),
	ExtensionType: (*HttpRule)(nil),
	Field:         72295728,
	Name:          "google.api.http",
	Tag:           "bytes,72295728,opt,name=http",
	Filename:      "google/api/annotations.proto",
}

Functions

This section is empty.

Types

type CustomHttpPattern 

type CustomHttpPattern struct {
	// The name of this custom HTTP verb.
	Kind string `protobuf:"bytes,1,opt,name=kind" json:"kind,omitempty"`
	// The path matched by this custom verb.
	Path string `protobuf:"bytes,2,opt,name=path" json:"path,omitempty"`
}

A custom pattern is used for defining custom HTTP verb.

func (*CustomHttpPattern) Descriptor 

func (*CustomHttpPattern) Descriptor() ([]byte, []int)

func (*CustomHttpPattern) GetKind 

func (m *CustomHttpPattern) GetKind() string

func (*CustomHttpPattern) GetPath 

func (m *CustomHttpPattern) GetPath() string

func (*CustomHttpPattern) ProtoMessage 

func (*CustomHttpPattern) ProtoMessage()

func (*CustomHttpPattern) Reset 

func (m *CustomHttpPattern) Reset()

func (*CustomHttpPattern) String 

func (m *CustomHttpPattern) String() string

type Http 

type Http struct {
	// A list of HTTP configuration rules that apply to individual API methods.
	//
	// **NOTE:** All service configuration rules follow "last one wins" order.
	Rules []*HttpRule `protobuf:"bytes,1,rep,name=rules" json:"rules,omitempty"`
}

Defines the HTTP configuration for a service. It contains a list of HttpRule[google.api.HttpRule], each specifying the mapping of an RPC method to one or more HTTP REST API methods.

func (*Http) Descriptor 

func (*Http) Descriptor() ([]byte, []int)

func (*Http) GetRules 

func (m *Http) GetRules() []*HttpRule

func (*Http) ProtoMessage 

func (*Http) ProtoMessage()

func (*Http) Reset 

func (m *Http) Reset()

func (*Http) String 

func (m *Http) String() string

type HttpRule 

type HttpRule struct {
	// Selects methods to which this rule applies.
	//
	// Refer to [selector][google.api.DocumentationRule.selector] for syntax details.
	Selector string `protobuf:"bytes,1,opt,name=selector" json:"selector,omitempty"`
	// Determines the URL pattern is matched by this rules. This pattern can be
	// used with any of the {get|put|post|delete|patch} methods. A custom method
	// can be defined using the 'custom' field.
	//
	// Types that are valid to be assigned to Pattern:
	//	*HttpRule_Get
	//	*HttpRule_Put
	//	*HttpRule_Post
	//	*HttpRule_Delete
	//	*HttpRule_Patch
	//	*HttpRule_Custom
	Pattern isHttpRule_Pattern `protobuf_oneof:"pattern"`
	// The name of the request field whose value is mapped to the HTTP body, or
	// `*` for mapping all fields not captured by the path pattern to the HTTP
	// body. NOTE: the referred field must not be a repeated field and must be
	// present at the top-level of request message type.
	Body string `protobuf:"bytes,7,opt,name=body" json:"body,omitempty"`
	// Additional HTTP bindings for the selector. Nested bindings must
	// not contain an `additional_bindings` field themselves (that is,
	// the nesting may only be one level deep).
	AdditionalBindings []*HttpRule `protobuf:"bytes,11,rep,name=additional_bindings,json=additionalBindings" json:"additional_bindings,omitempty"`
}

`HttpRule` defines the mapping of an RPC method to one or more HTTP REST APIs. The mapping determines what portions of the request message are populated from the path, query parameters, or body of the HTTP request. The mapping is typically specified as an `google.api.http` annotation, see "google/api/annotations.proto" for details.

The mapping consists of a field specifying the path template and method kind. The path template can refer to fields in the request message, as in the example below which describes a REST GET operation on a resource collection of messages: 

service Messaging {
  rpc GetMessage(GetMessageRequest) returns (Message) {
    option (google.api.http).get = "/v1/messages/{message_id}/{sub.subfield}";
  }
}
message GetMessageRequest {
  message SubMessage {
    string subfield = 1;
  }
  string message_id = 1; // mapped to the URL
  SubMessage sub = 2;    // `sub.subfield` is url-mapped
}
message Message {
  string text = 1; // content of the resource
}

The same http annotation can alternatively be expressed inside the `GRPC API Configuration` YAML file. 

http:
  rules:
    - selector: <proto_package_name>.Messaging.GetMessage
      get: /v1/messages/{message_id}/{sub.subfield}

This definition enables an automatic, bidrectional mapping of HTTP JSON to RPC. Example:

HTTP | RPC -----|----- `GET /v1/messages/123456/foo` | `GetMessage(message_id: "123456" sub: SubMessage(subfield: "foo"))`

In general, not only fields but also field paths can be referenced from a path pattern. Fields mapped to the path pattern cannot be repeated and must have a primitive (non-message) type.

Any fields in the request message which are not bound by the path pattern automatically become (optional) HTTP query parameters. Assume the following definition of the request message: 

message GetMessageRequest {
  message SubMessage {
    string subfield = 1;
  }
  string message_id = 1; // mapped to the URL
  int64 revision = 2;    // becomes a parameter
  SubMessage sub = 3;    // `sub.subfield` becomes a parameter
}

This enables a HTTP JSON to RPC mapping as below:

HTTP | RPC -----|----- `GET /v1/messages/123456?revision=2&sub.subfield=foo` | `GetMessage(message_id: "123456" revision: 2 sub: SubMessage(subfield: "foo"))`

Note that fields which are mapped to HTTP parameters must have a primitive type or a repeated primitive type. Message types are not allowed. In the case of a repeated type, the parameter can be repeated in the URL, as in `...?param=A&param=B`.

For HTTP method kinds which allow a request body, the `body` field specifies the mapping. Consider a REST update method on the message resource collection: 

service Messaging {
  rpc UpdateMessage(UpdateMessageRequest) returns (Message) {
    option (google.api.http) = {
      put: "/v1/messages/{message_id}"
      body: "message"
    };
  }
}
message UpdateMessageRequest {
  string message_id = 1; // mapped to the URL
  Message message = 2;   // mapped to the body
}

The following HTTP JSON to RPC mapping is enabled, where the representation of the JSON in the request body is determined by protos JSON encoding:

HTTP | RPC -----|----- `PUT /v1/messages/123456 { "text": "Hi!" }` | `UpdateMessage(message_id: "123456" message { text: "Hi!" })`

The special name `*` can be used in the body mapping to define that every field not bound by the path template should be mapped to the request body. This enables the following alternative definition of the update method: 

service Messaging {
  rpc UpdateMessage(Message) returns (Message) {
    option (google.api.http) = {
      put: "/v1/messages/{message_id}"
      body: "*"
    };
  }
}
message Message {
  string message_id = 1;
  string text = 2;
}

The following HTTP JSON to RPC mapping is enabled:

HTTP | RPC -----|----- `PUT /v1/messages/123456 { "text": "Hi!" }` | `UpdateMessage(message_id: "123456" text: "Hi!")`

Note that when using `*` in the body mapping, it is not possible to have HTTP parameters, as all fields not bound by the path end in the body. This makes this option more rarely used in practice of defining REST APIs. The common usage of `*` is in custom methods which don't use the URL at all for transferring data.

It is possible to define multiple HTTP methods for one RPC by using the `additional_bindings` option. Example: 

service Messaging {
  rpc GetMessage(GetMessageRequest) returns (Message) {
    option (google.api.http) = {
      get: "/v1/messages/{message_id}"
      additional_bindings {
        get: "/v1/users/{user_id}/messages/{message_id}"
      }
    };
  }
}
message GetMessageRequest {
  string message_id = 1;
  string user_id = 2;
}

This enables the following two alternative HTTP JSON to RPC mappings:

HTTP | RPC -----|----- `GET /v1/messages/123456` | `GetMessage(message_id: "123456")` `GET /v1/users/me/messages/123456` | `GetMessage(user_id: "me" message_id: "123456")`

Rules for HTTP mapping

The rules for mapping HTTP path, query parameters, and body fields to the request message are as follows:

  1. The `body` field specifies either `*` or a field path, or is omitted. If omitted, it assumes there is no HTTP body.
  2. Leaf fields (recursive expansion of nested messages in the request) can be classified into three types: (a) Matched in the URL template. (b) Covered by body (if body is `*`, everything except (a) fields; else everything under the body field) (c) All other fields.
  3. URL query parameters found in the HTTP request are mapped to (c) fields.
  4. Any body sent with an HTTP request can contain only (b) fields.

The syntax of the path template is as follows: 

Template = "/" Segments [ Verb ] ;
Segments = Segment { "/" Segment } ;
Segment  = "*" | "**" | LITERAL | Variable ;
Variable = "{" FieldPath [ "=" Segments ] "}" ;
FieldPath = IDENT { "." IDENT } ;
Verb     = ":" LITERAL ;

The syntax `*` matches a single path segment. It follows the semantics of [RFC 6570](https://tools.ietf.org/html/rfc6570) Section 3.2.2 Simple String Expansion.

The syntax `**` matches zero or more path segments. It follows the semantics of [RFC 6570](https://tools.ietf.org/html/rfc6570) Section 3.2.3 Reserved Expansion. NOTE: it must be the last segment in the path except the Verb.

The syntax `LITERAL` matches literal text in the URL path.

The syntax `Variable` matches the entire path as specified by its template; this nested template must not contain further variables. If a variable matches a single path segment, its template may be omitted, e.g. `{var}` is equivalent to `{var=*}`.

NOTE: the field paths in variables and in the `body` must not refer to repeated fields or map fields.

Use CustomHttpPattern to specify any HTTP method that is not included in the `pattern` field, such as HEAD, or "*" to leave the HTTP method unspecified for a given URL path rule. The wild-card rule is useful for services that provide content to Web (HTML) clients.

func (*HttpRule) Descriptor 

func (*HttpRule) Descriptor() ([]byte, []int)

func (*HttpRule) GetAdditionalBindings 

func (m *HttpRule) GetAdditionalBindings() []*HttpRule

func (*HttpRule) GetBody 

func (m *HttpRule) GetBody() string

func (*HttpRule) GetCustom 

func (m *HttpRule) GetCustom() *CustomHttpPattern

func (*HttpRule) GetDelete 

func (m *HttpRule) GetDelete() string

func (*HttpRule) GetGet 

func (m *HttpRule) GetGet() string

func (*HttpRule) GetPatch 

func (m *HttpRule) GetPatch() string

func (*HttpRule) GetPattern 

func (m *HttpRule) GetPattern() isHttpRule_Pattern

func (*HttpRule) GetPost 

func (m *HttpRule) GetPost() string

func (*HttpRule) GetPut 

func (m *HttpRule) GetPut() string

func (*HttpRule) GetSelector 

func (m *HttpRule) GetSelector() string

func (*HttpRule) ProtoMessage 

func (*HttpRule) ProtoMessage()

func (*HttpRule) Reset 

func (m *HttpRule) Reset()

func (*HttpRule) String 

func (m *HttpRule) String() string

func (*HttpRule) XXX_OneofFuncs 

func (*HttpRule) XXX_OneofFuncs() (func(msg proto.Message, b *proto.Buffer) error, func(msg proto.Message, tag, wire int, b *proto.Buffer) (bool, error), func(msg proto.Message) (n int), []interface{})

XXX_OneofFuncs is for the internal use of the proto package.

type HttpRule_Custom 

type HttpRule_Custom struct {
	Custom *CustomHttpPattern `protobuf:"bytes,8,opt,name=custom,oneof"`
}

type HttpRule_Delete 

type HttpRule_Delete struct {
	Delete string `protobuf:"bytes,5,opt,name=delete,oneof"`
}

type HttpRule_Get 

type HttpRule_Get struct {
	Get string `protobuf:"bytes,2,opt,name=get,oneof"`
}

type HttpRule_Patch 

type HttpRule_Patch struct {
	Patch string `protobuf:"bytes,6,opt,name=patch,oneof"`
}

type HttpRule_Post 

type HttpRule_Post struct {
	Post string `protobuf:"bytes,4,opt,name=post,oneof"`
}

type HttpRule_Put 

type HttpRule_Put struct {
	Put string `protobuf:"bytes,3,opt,name=put,oneof"`
}

Source Files

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