Revert "refactor: make self for offer_snapshot mutable (#27)"

This reverts commit f9f4685.

abci/examples/echo_socket.rs

@@ -18,7 +18,7 @@ pub fn main() {
     let app = EchoApp {};
 
     let cancel = CANCEL_TOKEN.clone();
-    let mut server = ServerBuilder::new(app, &socket)
+    let server = ServerBuilder::new(app, &socket)
         .with_cancel_token(cancel)
         .build()
         .expect("server failed");

abci/src/application.rs

@@ -80,7 +80,7 @@ pub trait Application {
 
     /// Called when bootstrapping the node using state sync.
     fn offer_snapshot(
-        &mut self,
+        &self,
         _request: abci::RequestOfferSnapshot,
     ) -> Result<abci::ResponseOfferSnapshot, abci::ResponseException> {
         Ok(Default::default())
@@ -144,12 +144,12 @@ pub trait RequestDispatcher {
     ///
     /// `RequestDispatcher` can indicate that it will no longer process new
     /// requests by returning `None` variant.
-    fn handle(&mut self, request: abci::Request) -> Option<abci::Response>;
+    fn handle(&self, request: abci::Request) -> Option<abci::Response>;
 }
 
 // Implement `RequestDispatcher` for all `Application`s.
 impl<A: Application> RequestDispatcher for A {
-    fn handle(&mut self, request: abci::Request) -> Option<abci::Response> {
+    fn handle(&self, request: abci::Request) -> Option<abci::Response> {
         tracing::trace!(?request, "received request");
 
         let response: Result<response::Value, abci::ResponseException> = match request.value? {

abci/src/server.rs

@@ -31,10 +31,10 @@ pub trait Server {
     /// however, errors must be examined and handled, as the connection
     /// should not terminate. One exception is [Error::Cancelled], which
     /// means server shutdown was requested.
-    fn next_client(&mut self) -> Result<(), Error>;
+    fn next_client(&self) -> Result<(), Error>;
 
     #[deprecated = "use `next_client()`"]
-    fn handle_connection(&mut self) -> Result<(), Error> {
+    fn handle_connection(&self) -> Result<(), Error> {
         self.next_client()
     }
 }
@@ -56,7 +56,7 @@ pub trait Server {
 /// impl tenderdash_abci::Application for MyAbciApplication {};
 /// let app = MyAbciApplication {};
 /// let bind_address = "unix:///tmp/abci.sock";
-/// let mut server = tenderdash_abci::ServerBuilder::new(app, &bind_address).build().expect("server failed");
+/// let server = tenderdash_abci::ServerBuilder::new(app, &bind_address).build().expect("server failed");
 /// loop {
 ///     if let Err(tenderdash_abci::Error::Cancelled()) = server.next_client() {
 ///         break;

abci/src/server/generic.rs

@@ -98,7 +98,7 @@ where
     L::Addr: Send + Debug,
     L::Io: Send,
 {
-    fn next_client(&mut self) -> Result<(), Error> {
+    fn next_client(&self) -> Result<(), Error> {
         // we create child token to stop the codec but not kill the app
         let cancel_token = self.cancel.child_token();
         let listener = Arc::clone(&self.listener);

abci/tests/kvstore.rs

@@ -55,7 +55,7 @@ fn test_kvstore() {
     let bind_address = format!("unix://{}", SOCKET);
 
     let cancel = CANCEL_TOKEN.clone();
-    let mut server = ServerBuilder::new(abci_app, &bind_address)
+    let server = ServerBuilder::new(abci_app, &bind_address)
         .with_cancel_token(cancel)
         .build()
         .expect("server failed");

abci/tests/tcp.rs

@@ -50,7 +50,7 @@ fn tcp_server_test(test_name: &str, bind_address: &str) {
 
     let app = TestDispatcher {};
 
-    let mut server = ServerBuilder::new(app, &bind_address)
+    let server = ServerBuilder::new(app, &bind_address)
         .build()
         .expect("server failed");
     let socket_uri = bind_address.to_string();
@@ -72,7 +72,7 @@ fn tcp_server_test(test_name: &str, bind_address: &str) {
 pub struct TestDispatcher {}
 
 impl RequestDispatcher for TestDispatcher {
-    fn handle(&mut self, request: proto::abci::Request) -> Option<proto::abci::Response> {
+    fn handle(&self, request: proto::abci::Request) -> Option<proto::abci::Response> {
         // Assert that Info request will is received and close the connection
         assert!(matches!(
             request.value,

abci/tests/unix.rs

@@ -29,7 +29,7 @@ fn test_unix_socket_server() {
 
     let app = TestDispatcher {};
 
-    let mut server = ServerBuilder::new(app, &bind_address)
+    let server = ServerBuilder::new(app, &bind_address)
         .build()
         .expect("server failed");
 
@@ -53,7 +53,7 @@ fn test_unix_socket_server() {
 pub struct TestDispatcher {}
 
 impl RequestDispatcher for TestDispatcher {
-    fn handle(&mut self, request: proto::abci::Request) -> Option<proto::abci::Response> {
+    fn handle(&self, request: proto::abci::Request) -> Option<proto::abci::Response> {
         // Assert that Info request will is received and close the connection
         assert!(matches!(
             request.value,