add: signal server

proto/signaler_service.proto

@@ -1,6 +1,9 @@
 syntax = "proto3";
 
+package signaler;
+
 service SignalerService {
+    rpc CreateAuthToken(CreateAuthTokenRequest) returns (AuthToken);
     rpc ListCameras(ListCamerasRequest) returns (ListCamerasResponse);
 
     // CreateSession creates a new session that can be seen bv the provided Camera and Peer.
@@ -15,6 +18,34 @@ service SignalerService {
     // TODO: it would be better if we could alert a camera to poll for sessions
     // i.e., with websockets (or streaming RPCs).
     rpc ListSessions(ListSessionsRequest) returns (ListSessionsResponse);
+
+    // CreateIceCandidate adds the provided candidate to the list of candidates.
+    rpc CreateIceCandidate(CreateIceCandidateRequest) returns (IceCandidate);
+    // PopIceCandidate delete a candidate from the list of candidates and returns it.
+    //
+    // If there are no candidates, this blocks until one becomes available.
+    rpc PopIceCandidate(PopIceCandidateRequest) returns (IceCandidate);
+
+    rpc CreateIceSessionDescription(CreateIceSessionDescriptionRequest) returns (IceSessionDescription);
+    rpc PopIceSessionDescription(PopIceSessionDescriptionRequest) returns (IceSessionDescription);
+
+}
+
+message CreateAuthTokenRequest{
+    // Homes this auth token should be registered too.
+    string home = 1;
+
+    message Camera {
+        // Used to uniquely identifier this camera so clients can open
+        // sessions with it.
+        string id = 1;
+    }
+    message Client {}
+
+    oneof type {
+        Camera camera = 2;
+        Client client = 3;
+    }
 }
 
 message ListCamerasRequest {}
@@ -41,6 +72,30 @@ message UpdateSessionRequest {
     bool wait_for_update = 2;
 }
 
+message ListSessionsRequest {}
+
+message ListSessionsResponse {
+    repeated Session sessions = 1;
+}
+
+message CreateIceCandidateRequest {
+    Session.Identifier session_identifier = 1;
+    IceCandidate candidate = 2;
+}
+
+message PopIceCandidateRequest {
+    Session.Identifier session_identifier = 1;
+}
+
+message CreateIceSessionDescriptionRequest {
+    Session.Identifier session_identifier = 1;
+    IceSessionDescription description = 2;
+}
+
+message PopIceSessionDescriptionRequest {
+    Session.Identifier session_identifier = 1;
+}
+
 message Camera {
     message Identifier {
         string id = 1;
@@ -58,7 +113,7 @@ message IceCandidate {
 
 message IceSessionDescription {
     // Copied from https://pkg.go.dev/github.com/pion/webrtc/v4#SessionDescription
-    int sdp_type = 1;
+    int64 sdp_type = 1;
     string sdp = 2;
 }
 
@@ -73,4 +128,8 @@ message Session {
 
     IceSessionDescription camera_offer = 5;
     IceSessionDescription client_answer = 6;
+}
+
+message AuthToken {
+    string token = 1;
 }