add: sensors

proto/signaler_service.proto

@@ -23,6 +23,12 @@ service SignalerService {
     // If there are no messages, this blocks until one becomes available.
     rpc PopIceMessage(PopIceMessageRequest) returns (IceMessage);
 
+    // CreateSample creates a sample for the given camera.
+    // If called without an auth token indicating a camera, an error
+    // is returned.
+    // TODO: this should be moved to a seperate service
+    rpc CreateSample(CreateSampleRequest) returns (Sample);
+    rpc ListSamples(ListSamplesRequest) returns (ListSamplesResponse);
 }
 
 message CreateAuthTokenRequest{
@@ -85,6 +91,17 @@ message PopIceMessageRequest {
     Session.Identifier session_identifier = 1;
 }
 
+message CreateSampleRequest{
+    Sample sample = 1;
+}
+
+message ListSamplesRequest {
+}
+
+message ListSamplesResponse {
+    repeated Sample samples = 1;
+}
+
 message Camera {
     message Identifier {
         string id = 1;
@@ -126,4 +143,18 @@ message Session {
 
 message AuthToken {
     string token = 1;
+}
+
+message Sample{
+    enum Type {
+        UNSPECIFIED = 0;
+        TEMPERATURE_C = 1;
+        HUMIDITY = 2;
+        PRESSURE = 3;
+    }
+    Type type = 1;
+    double reading = 2;
+
+    // Read-only; will be ignored in CreateSample.
+    Camera.Identifier camera_id = 3;
 }