From c0424e7a55250705579ee64c269892677fa86adf Mon Sep 17 00:00:00 2001
From: "Claudius \"keldu\" Holeksa" <mail@keldu.de>
Date: Fri, 15 Mar 2024 14:41:47 +0100
Subject: async,io: Fixed immediate issues in async and built a basic io
 echo_server

---
 modules/io/examples/echo.hpp        |  1 +
 modules/io/examples/echo_client.cpp |  2 ++
 modules/io/examples/echo_server.cpp | 71 +++++++++++++++++++++++++++++++++++--
 3 files changed, 72 insertions(+), 2 deletions(-)

(limited to 'modules/io/examples')

diff --git a/modules/io/examples/echo.hpp b/modules/io/examples/echo.hpp
index 2201457..4eb8084 100644
--- a/modules/io/examples/echo.hpp
+++ b/modules/io/examples/echo.hpp
@@ -3,6 +3,7 @@
 struct message {
 	std::array<uint8_t, 256> data;
 	uint64_t already_read = 0;
+	uint64_t already_written = 0;
 };
 
 constexpr std::string_view message_content = "Hello! This is an echo msg.";
diff --git a/modules/io/examples/echo_client.cpp b/modules/io/examples/echo_client.cpp
index 9e56f6b..ad03779 100644
--- a/modules/io/examples/echo_client.cpp
+++ b/modules/io/examples/echo_client.cpp
@@ -31,5 +31,7 @@ int main(){
 		wait_scope.wait();
 	}
 
+	std::cout<<"Shutting down echo client"<<std::endl;
+
 	return 0;
 }
diff --git a/modules/io/examples/echo_server.cpp b/modules/io/examples/echo_server.cpp
index a158368..50863db 100644
--- a/modules/io/examples/echo_server.cpp
+++ b/modules/io/examples/echo_server.cpp
@@ -4,6 +4,21 @@
 
 #include "echo.hpp"
 
+saw::error_or<void> handle_echo_write(saw::io_stream& rmt_clt, message& state, uint64_t tbw){
+	auto eov = rmt_clt.write(&state.data[state.already_written], tbw);
+	if(eov.is_error()){
+		return std::move(eov.get_error());
+	}
+
+	auto val = eov.get_value();
+	state.already_written += val;
+	if(state.already_written > state.already_read){
+		exit(-1);
+	}
+
+	return saw::void_t{};
+}
+
 void handle_echo_message(saw::io_stream& rmt_clt, bool& keep_running, message& state){
 	rmt_clt.read_ready().then([&](){
 		for(;;){
@@ -11,12 +26,61 @@ void handle_echo_message(saw::io_stream& rmt_clt, bool& keep_running, message& s
 			if(tbr == 0){
 				exit(-1);
 			}
-			auto eov = rmt_clt.read(&state.data[0], tbr);
+			auto eov = rmt_clt.read(&state.data[state.already_read], tbr);
 
 			if(eov.is_error()){
 				auto& err = eov.get_error();
 				if(err.is_critical()){
+					std::cerr<<err.get_category()<<std::endl;
 					exit(err.get_id());
+				}else{
+					break;
+				}
+			}
+			auto read_bytes = eov.get_value();
+			if(read_bytes == 0u){
+				exit(-1);
+			}
+
+			bool trigger_write = (state.already_read == state.already_written);
+
+			state.already_read += read_bytes;
+			if(state.already_read > state.data.size()){
+				state.already_read = state.data.size();
+			}
+			if(trigger_write){
+				auto eov = handle_echo_write(rmt_clt, state, state.already_read - state.already_written);
+				if(eov.is_error()){
+					auto& err = eov.get_error();
+					if(err.is_critical()){
+						std::cerr<<err.get_category()<<std::endl;
+						exit(err.get_id());
+					}else {
+						break;
+					}
+				}
+			}
+		}
+	}).detach();
+
+	rmt_clt.write_ready().then([&](){
+		for(;;){
+			if(state.already_read < state.already_written){
+				exit(-1);
+			}
+			uint64_t tbw = state.already_read - state.already_written;
+			if(tbw == 0){
+				break;
+			}
+
+			auto eov = handle_echo_write(rmt_clt, state, tbw);
+			if(eov.is_error()){
+				auto& err = eov.get_error();
+				if(err.is_critical()){
+					std::cerr<<err.get_category()<<std::endl;
+					exit(err.get_id());
+				}else {
+					break;
 				}
 			}
 		}
@@ -62,10 +126,13 @@ int main(){
 		srv = network.listen(*addr);
 		if(srv){
 			srv->accept().then([&](auto client) -> saw::error_or<void>{
+
 				if(!remote_client){
+					std::cout<<"Accepted client"<<std::endl;
 					remote_client = std::move(client);
 
 					if(remote_client){
+						std::cout<<"Spinning up handler"<<std::endl;
 						handle_echo_message(*remote_client, keep_running, msg_state);
 					}else{
 						keep_running = false;
@@ -86,7 +153,7 @@ int main(){
 
 	wait_scope.poll();
 	while(keep_running){
-		wait_scope.wait(std::chrono::seconds{60});
+		wait_scope.wait(std::chrono::seconds{5});
 	}
 
 	std::cout<<"\n\nShutting down echo server"<<std::endl;
-- 
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