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// Copyright (C) 2018 The Android Open Source Project
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// Note that if you add/remove methods in this file you must update
// the metrics sql as well by running ./android/scripts/gen-grpc-sql.py
//
// Please group deleted methods in a block including the date (MM/DD/YY)
// it was removed. This enables us to easily keep metrics around after removal
//
// List of deleted methods
// rpc iWasDeleted (03/12/12)
// ...
syntax = "proto3";
option java_multiple_files = true;
option java_package = "com.android.emulator.control";
option objc_class_prefix = "AEC";
package android.emulation.control;
import "google/protobuf/empty.proto";
// An RTC service lets you interact with the emulator through WebRTC
// Note that this is currently an experimental feature, and that the
// service definition might change without notice. Use at your own risk!
//
// The following endpoints are needed to establish the webrtc protocol
// Due to limitiations in Javascript we cannot make use of bidirectional
// endpoints See this [blog](https://grpc.io/blog/state-of-grpc-web) for
// details.
service Rtc {
// This function will generate a new identifier that the client
// should use for further interaction. It will initiate the
// JSEP protocol on the server side.
rpc requestRtcStream(google.protobuf.Empty) returns (RtcId) {}
// Sends the given JsepMsg to the server. The RtcId in the
// message should point to an active stream negotiation in
// progress, otherwise the message will be ignored.
rpc sendJsepMessage(JsepMsg) returns (google.protobuf.Empty) {}
// Reads an available jsep messages for the given client id,
// blocking until one becomes available. Do not use the polling version
// above if you opt for this one.
//
// The ice candidates for example will trickle in on this callback,
// as will the SDP negotation.
rpc receiveJsepMessages(RtcId) returns (stream JsepMsg) {}
// [DEPRECATED] This is only here as the go grpc webproxy used
// by fuchsia does not support server side streaming. This method
// will be removed in the future and should not be relied upon.
//
// Reads an available jsep messages for the given client id,
// blocking until one becomes available. Do not use the polling version
// above if you opt for this one.
//
// The ice candidates for example will trickle in on this callback,
// as will the SDP negotation.
rpc receiveJsepMessage(RtcId) returns (JsepMsg) {}
}
message RtcId {
// The unique identifier of this connection. You will have to use the
// same identifier when sending/receiving messages. The server will
// generate a guid when receiving the start message.
string guid = 1;
}
message JsepMsg {
// The unique identifier of this connection. You will have to use the
// same identifier when sending/receiving messages. The server will
// generate a guid when receiving the start message.
RtcId id = 1;
// The JSON payload. This usually can be directly handled by the
// Javascript library.
//
// The dictionary can contain the following properties
//
// - bye:
// You can hang up now. No new message expected for you.
// The server has stopped the RTC stream.
//
// - start:
// An RTCConfiguration dictionary providing options to
// configure the new connection. This can include the
// turn configuration the serve is using. This dictionary can be
// passed in directly to the
// [RTCPeerConnection](https://developer.mozilla.org/en-US/docs/Web/API/RTCPeerConnection)
// object.
//
// - candidate:
// The WebRTC API's RTCIceCandidateInit dictionary, which
// contains the information needed to fundamentally describe an
// RTCIceCandidate. See
// [RTCIceCandidate](https://developer.mozilla.org/en-US/docs/Web/API/RTCIceCandidate)
// and [Session
// Lifetime](https://developer.mozilla.org/en-US/docs/Web/API/WebRTC_API/Session_lifetime)
// for more details.
//
// - sdp:
// RTCSessionDescriptionInit dictionary containing the values
// to that can be assigned to a
// [RTCSessionDescription](https://developer.mozilla.org/en-US/docs/Web/API/RTCSessionDescription)
string message = 2;
}