cross server client

common/proto/auth.proto

@@ -2,9 +2,10 @@
 syntax = "proto3";
 package komp_ac.auth;
 
-import "common.proto";
-
 service AuthService {
+  // Identifies the logical database before the client selects a saved token.
+  // This endpoint is deliberately unauthenticated.
+  rpc GetServerIdentity(GetServerIdentityRequest) returns (ServerIdentity);
   rpc Register(RegisterRequest) returns (AuthResponse);
   rpc Login(LoginRequest) returns (LoginResponse);
   // Changes the authenticated user's password after verifying the current one.
@@ -45,6 +46,12 @@ service AuthService {
   rpc ListUsers(ListUsersRequest) returns (ListUsersResponse);
 }
 
+message ServerIdentity {
+  string instance_id = 1; // Stable UUID stored inside this database
+}
+
+message GetServerIdentityRequest {}
+
 message RegisterRequest {
   string username = 1;
   string email = 2;

common/src/proto/komp_ac.auth.rs

@@ -1,6 +1,16 @@
 // This file is @generated by prost-build.
 #[derive(serde::Serialize, serde::Deserialize)]
 #[derive(Clone, PartialEq, Eq, Hash, ::prost::Message)]
+pub struct ServerIdentity {
+    /// Stable UUID stored inside this database
+    #[prost(string, tag = "1")]
+    pub instance_id: ::prost::alloc::string::String,
+}
+#[derive(serde::Serialize, serde::Deserialize)]
+#[derive(Clone, Copy, PartialEq, Eq, Hash, ::prost::Message)]
+pub struct GetServerIdentityRequest {}
+#[derive(serde::Serialize, serde::Deserialize)]
+#[derive(Clone, PartialEq, Eq, Hash, ::prost::Message)]
 pub struct RegisterRequest {
     #[prost(string, tag = "1")]
     pub username: ::prost::alloc::string::String,
@@ -473,6 +483,31 @@ pub mod auth_service_client {
             self.inner = self.inner.max_encoding_message_size(limit);
             self
         }
+        /// Identifies the logical database before the client selects a saved token.
+        /// This endpoint is deliberately unauthenticated.
+        pub async fn get_server_identity(
+            &mut self,
+            request: impl tonic::IntoRequest<super::GetServerIdentityRequest>,
+        ) -> std::result::Result<tonic::Response<super::ServerIdentity>, tonic::Status> {
+            self.inner
+                .ready()
+                .await
+                .map_err(|e| {
+                    tonic::Status::unknown(
+                        format!("Service was not ready: {}", e.into()),
+                    )
+                })?;
+            let codec = tonic_prost::ProstCodec::default();
+            let path = http::uri::PathAndQuery::from_static(
+                "/komp_ac.auth.AuthService/GetServerIdentity",
+            );
+            let mut req = request.into_request();
+            req.extensions_mut()
+                .insert(
+                    GrpcMethod::new("komp_ac.auth.AuthService", "GetServerIdentity"),
+                );
+            self.inner.unary(req, path, codec).await
+        }
         pub async fn register(
             &mut self,
             request: impl tonic::IntoRequest<super::RegisterRequest>,
@@ -947,6 +982,12 @@ pub mod auth_service_server {
     /// Generated trait containing gRPC methods that should be implemented for use with AuthServiceServer.
     #[async_trait]
     pub trait AuthService: std::marker::Send + std::marker::Sync + 'static {
+        /// Identifies the logical database before the client selects a saved token.
+        /// This endpoint is deliberately unauthenticated.
+        async fn get_server_identity(
+            &self,
+            request: tonic::Request<super::GetServerIdentityRequest>,
+        ) -> std::result::Result<tonic::Response<super::ServerIdentity>, tonic::Status>;
         async fn register(
             &self,
             request: tonic::Request<super::RegisterRequest>,
@@ -1138,6 +1179,52 @@ pub mod auth_service_server {
         }
         fn call(&mut self, req: http::Request<B>) -> Self::Future {
             match req.uri().path() {
+                "/komp_ac.auth.AuthService/GetServerIdentity" => {
+                    #[allow(non_camel_case_types)]
+                    struct GetServerIdentitySvc<T: AuthService>(pub Arc<T>);
+                    impl<
+                        T: AuthService,
+                    > tonic::server::UnaryService<super::GetServerIdentityRequest>
+                    for GetServerIdentitySvc<T> {
+                        type Response = super::ServerIdentity;
+                        type Future = BoxFuture<
+                            tonic::Response<Self::Response>,
+                            tonic::Status,
+                        >;
+                        fn call(
+                            &mut self,
+                            request: tonic::Request<super::GetServerIdentityRequest>,
+                        ) -> Self::Future {
+                            let inner = Arc::clone(&self.0);
+                            let fut = async move {
+                                <T as AuthService>::get_server_identity(&inner, request)
+                                    .await
+                            };
+                            Box::pin(fut)
+                        }
+                    }
+                    let accept_compression_encodings = self.accept_compression_encodings;
+                    let send_compression_encodings = self.send_compression_encodings;
+                    let max_decoding_message_size = self.max_decoding_message_size;
+                    let max_encoding_message_size = self.max_encoding_message_size;
+                    let inner = self.inner.clone();
+                    let fut = async move {
+                        let method = GetServerIdentitySvc(inner);
+                        let codec = tonic_prost::ProstCodec::default();
+                        let mut grpc = tonic::server::Grpc::new(codec)
+                            .apply_compression_config(
+                                accept_compression_encodings,
+                                send_compression_encodings,
+                            )
+                            .apply_max_message_size_config(
+                                max_decoding_message_size,
+                                max_encoding_message_size,
+                            );
+                        let res = grpc.unary(method, req).await;
+                        Ok(res)
+                    };
+                    Box::pin(fut)
+                }
                 "/komp_ac.auth.AuthService/Register" => {
                     #[allow(non_camel_case_types)]
                     struct RegisterSvc<T: AuthService>(pub Arc<T>);

komp-app/src/auth.rs

@@ -1,7 +1,8 @@
 use anyhow::{Context, Result};
 use common::proto::komp_ac::auth::{
     AddRoleRequest, AssignUserRoleRequest, AuthResponse, AuthorizationSnapshot,
-    ChangePasswordRequest, GetAuthorizationRequest, GetInternalErrorRequest, GrantPermissionRequest,
+    ChangePasswordRequest, GetAuthorizationRequest, GetInternalErrorRequest,
+    GetServerIdentityRequest, GrantPermissionRequest,
     GrantableObject, InternalError, ListGrantableObjectsRequest, ListInternalErrorsRequest,
     ListInternalErrorsResponse, ListRolePermissionsRequest, ListRolesRequest,
     ListUsersRequest, LoginRequest, LoginResponse, LogoutRequest, PasswordOperationResponse,
@@ -58,6 +59,15 @@ impl AuthClient {
         })
     }
 
+    pub async fn get_server_identity(&mut self) -> Result<String> {
+        Ok(self
+            .client
+            .get_server_identity(Request::new(GetServerIdentityRequest {}))
+            .await?
+            .into_inner()
+            .instance_id)
+    }
+
     pub async fn login(&mut self, identifier: String, password: String) -> Result<LoginResponse> {
         Ok(self
             .client