Echo example is not made by peer code

1 files changed, 162 insertions, 0 deletions

diff --git a/modules/io_codec/examples/echo_server.cpp b/modules/io_codec/examples/echo_server.cpp
new file mode 100644
index 0000000..f7f833f
--- /dev/null
+++ b/modules/io_codec/examples/echo_server.cpp
@@ -0,0 +1,162 @@
+#include "../c++/io_peer.hpp"
+
+#include <iostream>
+
+#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(;;){
+			uint64_t tbr = state.data.size() < state.already_read ? 0: state.data.size() - state.already_read;
+			if(tbr == 0){
+				exit(-1);
+			}
+			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;
+				}
+			}
+		}
+	}).detach();
+
+	rmt_clt.on_read_disconnected().then([&](){
+		keep_running = false;
+	}).detach();
+}
+
+int main(){
+	auto eo_aio = saw::setup_async_io();
+	if(eo_aio.is_error()){
+		auto& err = eo_aio.get_error();
+		std::cerr<<err.get_message()<<std::endl;
+		return err.get_id();
+	}
+	auto& aio = eo_aio.get_value();
+	/**
+	 * Make the event loop the current event loop on this thread
+	 */
+	saw::wait_scope wait_scope{aio.event_loop};
+
+	bool keep_running = true;
+	aio.event_port.on_signal(saw::Signal::Terminate).then([&keep_running](){
+		keep_running = false;
+	}).detach();
+
+	auto& network = aio.io->get_network();
+	saw::own<saw::network_address> addr = nullptr;
+	saw::own<saw::server> srv = nullptr;
+	saw::own<saw::io_stream> remote_client = nullptr;
+
+	message msg_state;
+
+	std::cout<<"Starting to resolve address"<<std::endl;
+	/**
+	 * Try to resolve address. If resolved
+	 */
+	network.resolve_address("127.0.0.1", 4322).then([&](auto net_addr){
+		std::cout<<"Resolved address"<<std::endl;
+		addr = std::move(net_addr);
+		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;
+					}
+				}
+				return saw::make_error<saw::err::critical>();
+			}).detach();
+		}else{
+			keep_running = false;
+		}
+	}).detach([&](auto err) {
+		std::cout<<"Failed to resolve address: "<<err.get_category()<<":"<<err.get_message()<<std::endl;
+		keep_running = false;
+		return err;
+	});
+
+	std::cout<<"Entering waiting loop"<<std::endl;
+
+	wait_scope.poll();
+	while(keep_running){
+		wait_scope.wait(std::chrono::seconds{5});
+	}
+
+	std::cout<<"\n\nShutting down echo server"<<std::endl;
+
+	return 0;
+}