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/*
* This file is open source software, licensed to you under the terms
* of the Apache License, Version 2.0 (the "License"). See the NOTICE file
* distributed with this work for additional information regarding copyright
* ownership. You may not use this file except in compliance with the License.
*
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
/*
* Copyright (C) 2020 ScyllaDB.
*/
#include <iostream>
#include <seastar/core/seastar.hh>
#include <seastar/core/reactor.hh>
#include <seastar/core/future-util.hh>
#include <seastar/net/api.hh>
seastar::future<> service_loop() {
return seastar::do_with(seastar::listen(seastar::make_ipv4_address({1234})),
[] (auto& listener) {
return seastar::keep_doing([&listener] () {
return listener.accept().then(
[] (seastar::accept_result res) {
std::cout << "Accepted connection from " << res.remote_address << "\n";
});
});
});
}
const char* canned_response = "Seastar is the future!\n";
seastar::future<> service_loop_2() {
seastar::listen_options lo;
lo.reuse_address = true;
return seastar::do_with(seastar::listen(seastar::make_ipv4_address({1234}), lo),
[] (auto& listener) {
return seastar::keep_doing([&listener] () {
return listener.accept().then(
[] (seastar::accept_result res) {
auto s = std::move(res.connection);
auto out = s.output();
return seastar::do_with(std::move(s), std::move(out),
[] (auto& s, auto& out) {
return out.write(canned_response).then([&out] {
return out.close();
});
});
});
});
});
}
seastar::future<> handle_connection_3(seastar::connected_socket s,
seastar::socket_address a) {
auto out = s.output();
auto in = s.input();
return do_with(std::move(s), std::move(out), std::move(in),
[] (auto& s, auto& out, auto& in) {
return seastar::repeat([&out, &in] {
return in.read().then([&out] (auto buf) {
if (buf) {
return out.write(std::move(buf)).then([&out] {
return out.flush();
}).then([] {
return seastar::stop_iteration::no;
});
} else {
return seastar::make_ready_future<seastar::stop_iteration>(
seastar::stop_iteration::yes);
}
});
}).then([&out] {
return out.close();
});
});
}
seastar::future<> service_loop_3() {
seastar::listen_options lo;
lo.reuse_address = true;
return seastar::do_with(seastar::listen(seastar::make_ipv4_address({1234}), lo),
[] (auto& listener) {
return seastar::keep_doing([&listener] () {
return listener.accept().then(
[] (seastar::accept_result res) {
// Note we ignore, not return, the future returned by
// handle_connection(), so we do not wait for one
// connection to be handled before accepting the next one.
(void)handle_connection_3(std::move(res.connection), std::move(res.remote_address)).handle_exception(
[] (std::exception_ptr ep) {
fmt::print(stderr, "Could not handle connection: {}\n", ep);
});
});
});
});
}
#include <seastar/core/app-template.hh>
int main(int ac, char** av) {
seastar::app_template app;
return app.run(ac, av, [] {
std::cout << "This is the tutorial examples demo. It is not running anything but rather makes sure the tutorial examples compile" << std::endl;
return seastar::make_ready_future<>();
});
}
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