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// This example program represents a minimal terminal chat program based on
// group communication.
//
// Setup for a minimal chat between "alice" and "bob":
// - ./build/bin/group_chat -s -p 4242
// - ./build/bin/group_chat -g remote:chatroom@localhost:4242 -n alice
// - ./build/bin/group_chat -g remote:chatroom@localhost:4242 -n bob
#include <cstdlib>
#include <iostream>
#include <map>
#include <set>
#include <sstream>
#include <vector>
#include "caf/all.hpp"
#include "caf/io/all.hpp"
#include "caf/string_algorithms.hpp"
CAF_BEGIN_TYPE_ID_BLOCK(group_chat, first_custom_type_id)
CAF_ADD_ATOM(group_chat, custom, broadcast_atom, "broadcast")
CAF_END_TYPE_ID_BLOCK(group_chat)
using namespace caf;
using namespace custom;
struct line {
std::string str;
};
std::istream& operator>>(std::istream& is, line& l) {
std::getline(is, l.str);
return is;
}
behavior client(event_based_actor* self, const std::string& name) {
return {
[=](broadcast_atom, const std::string& message) {
for (auto& dest : self->joined_groups()) {
self->send(dest, name + ": " + message);
}
},
[=](join_atom, const group& what) {
for (const auto& g : self->joined_groups()) {
std::cout << "*** leave " << to_string(g) << std::endl;
self->send(g, name + " has left the chatroom");
self->leave(g);
}
std::cout << "*** join " << to_string(what) << std::endl;
self->join(what);
self->send(what, name + " has entered the chatroom");
},
[=](const std::string& txt) {
// don't print own messages
if (self->current_sender() != self)
std::cout << txt << std::endl;
},
[=](const group_down_msg& g) {
std::cout << "*** chatroom offline: " << to_string(g.source) << std::endl;
},
};
}
class config : public actor_system_config {
public:
std::string name;
std::vector<std::string> group_uris;
uint16_t port = 0;
bool server_mode = false;
config() {
opt_group{custom_options_, "global"}
.add(name, "name,n", "set name")
.add(group_uris, "group,g", "join group")
.add(server_mode, "server,s", "run in server mode")
.add(port, "port,p", "set port (ignored in client mode)");
}
};
void run_server(actor_system& system, const config& cfg) {
auto res = system.middleman().publish_local_groups(cfg.port);
if (!res) {
std::cerr << "*** publishing local groups failed: "
<< to_string(res.error()) << std::endl;
return;
}
std::cout << "*** listening at port " << *res << std::endl
<< "*** press [enter] to quit" << std::endl;
std::string dummy;
std::getline(std::cin, dummy);
std::cout << "... cya" << std::endl;
}
void run_client(actor_system& system, const config& cfg) {
auto name = cfg.name;
while (name.empty()) {
std::cout << "please enter your name: " << std::flush;
if (!std::getline(std::cin, name)) {
std::cerr << "*** no name given... terminating" << std::endl;
return;
}
}
std::cout << "*** starting client, type '/help' for a list of commands\n";
auto client_actor = system.spawn(client, name);
for (auto& uri : cfg.group_uris) {
auto tmp = system.groups().get(uri);
if (tmp)
anon_send(client_actor, join_atom_v, std::move(*tmp));
else
std::cerr << R"(*** failed to parse ")" << uri << R"(" as group URI: )"
<< to_string(tmp.error()) << std::endl;
}
std::istream_iterator<line> eof;
std::vector<std::string> words;
for (std::istream_iterator<line> i{std::cin}; i != eof; ++i) {
auto send_input = [&] {
if (!i->str.empty())
anon_send(client_actor, broadcast_atom_v, i->str);
};
words.clear();
split(words, i->str, is_any_of(" "));
message_handler f{
[&](const std::string& cmd, const std::string& mod,
const std::string& id) {
if (cmd == "/join") {
auto grp = system.groups().get(mod, id);
if (grp)
anon_send(client_actor, join_atom_v, *grp);
} else {
send_input();
}
},
[&](const std::string& cmd) {
if (cmd == "/quit") {
std::cin.setstate(std::ios_base::eofbit);
} else if (cmd[0] == '/') {
std::cout << "*** available commands:\n"
" /join <module> <group> join a new chat channel\n"
" /quit quit the program\n"
" /help print this text\n";
} else {
send_input();
}
},
};
auto msg = message_builder(words.begin(), words.end()).move_to_message();
auto res = f(msg);
if (!res)
send_input();
}
// force actor to quit
anon_send_exit(client_actor, exit_reason::user_shutdown);
}
void caf_main(actor_system& system, const config& cfg) {
auto f = cfg.server_mode ? run_server : run_client;
f(system, cfg);
}
CAF_MAIN(id_block::group_chat, io::middleman)
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