From 21f52f91ddbaf409c45663a71d84033fbde22198 Mon Sep 17 00:00:00 2001
From: "Claudius \"keldu\" Holeksa" <mail@keldu.de>
Date: Fri, 8 Mar 2024 19:57:18 +0100
Subject: io: Preparing example env

---
 modules/io/examples/SConscript      | 28 +++++++++++++
 modules/io/examples/echo.hpp        |  8 ++++
 modules/io/examples/echo_client.cpp | 35 ++++++++++++++++
 modules/io/examples/echo_server.cpp | 84 +++++++++++++++++++++++++++++++++++++
 4 files changed, 155 insertions(+)
 create mode 100644 modules/io/examples/SConscript
 create mode 100644 modules/io/examples/echo.hpp
 create mode 100644 modules/io/examples/echo_client.cpp
 create mode 100644 modules/io/examples/echo_server.cpp

(limited to 'modules/io/examples')

diff --git a/modules/io/examples/SConscript b/modules/io/examples/SConscript
new file mode 100644
index 0000000..850edcd
--- /dev/null
+++ b/modules/io/examples/SConscript
@@ -0,0 +1,28 @@
+#!/bin/false
+
+import os
+import os.path
+import glob
+
+
+Import('env')
+
+dir_path = Dir('.').abspath
+
+# Environment for base library
+examples_env = env.Clone();
+
+examples_env.sources = sorted(glob.glob(dir_path + "/*.cpp"))
+examples_env.headers = sorted(glob.glob(dir_path + "/*.hpp"))
+
+env.sources += examples_env.sources;
+env.headers += examples_env.headers;
+
+objects_static = []
+examples_env.echo_client = examples_env.Program('#bin/echo_client', ['echo_client.cpp', env.sources]);
+examples_env.echo_server = examples_env.Program('#bin/echo_server', ['echo_server.cpp', env.sources]);
+
+# Set Alias
+env.Alias('examples', [examples_env.echo_client, examples_env.echo_server]);
+
+env.targets += ['examples'];
diff --git a/modules/io/examples/echo.hpp b/modules/io/examples/echo.hpp
new file mode 100644
index 0000000..2201457
--- /dev/null
+++ b/modules/io/examples/echo.hpp
@@ -0,0 +1,8 @@
+#pragma once
+
+struct message {
+	std::array<uint8_t, 256> data;
+	uint64_t already_read = 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
new file mode 100644
index 0000000..9e56f6b
--- /dev/null
+++ b/modules/io/examples/echo_client.cpp
@@ -0,0 +1,35 @@
+#include "../c++/io.hpp"
+
+#include <iostream>
+
+#include "echo.hpp"
+
+int main(){
+	/**
+	 * Create EventLoop
+	 * Setup EventPort to the outside world
+	 * And setup the io comms to the outside.
+	 */
+	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();
+
+	while(keep_running){
+		wait_scope.wait();
+	}
+
+	return 0;
+}
diff --git a/modules/io/examples/echo_server.cpp b/modules/io/examples/echo_server.cpp
new file mode 100644
index 0000000..82513ff
--- /dev/null
+++ b/modules/io/examples/echo_server.cpp
@@ -0,0 +1,84 @@
+#include "../c++/io.hpp"
+
+#include <iostream>
+
+#include "echo.hpp"
+
+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[0], tbr);
+
+			if(eov.is_error()){
+				auto& err = eov.get_error();
+				if(err.is_critical()){
+					exit(err.get_id());
+				}
+			}
+		}
+	}).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;
+
+	/**
+	 * Try to resolve address. If resolved
+	 */
+	network.resolve_address("127.0.0.1", 4321).then([&](auto net_addr){
+		addr = std::move(net_addr);
+		srv = network.listen(*addr);
+		if(srv){
+			srv->accept().then([&](auto client) -> saw::error_or<void>{
+				if(!remote_client){
+					remote_client = std::move(client);
+
+					if(remote_client){
+						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();
+
+	while(keep_running){
+		wait_scope.wait();
+	}
+
+	return 0;
+}
-- 
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