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#include <iostream>
#include <tuple>
#include <cstdlib>
#include "referee.h"
// Timeout in milliseconds for the feature negotiation at the start of the
// protocol. If the referee hasn't sent anything after this timeout, we assume
// the referee isn't capable of sending feature lines.
#define FEATURE_TIMEOUT 200
Referee::Referee(bool verbose, const string_view execname, const vector<string> &players)
: verbose(verbose)
, proc(execname)
, refereeExecname(execname)
, numPlayers(players.size()) {
proc.run();
reftag = "REF(" + to_string(proc.getPid()) + ") ";
if (verbose) {
cout << reftag << "starting for:";
for (const string &p : players) cout << " " << p;
cout << endl;
}
queryFeatures();
if (!features.version2) {
cout << reftag << "does not support protocol version 2!" << endl;
exit(1);
}
proc.writeLine(to_string(players.size()), false);
for (const string &p : players) {
proc.writeLine(p, false);
}
}
Referee::~Referee() {
if (verbose) {
cout << reftag << "stopping" << endl;
}
proc.wait();
proc.terminate();
}
Referee::Event Referee::nextEvent() {
optional<string> ocommand = proc.readLine();
if (!ocommand) {
cout << reftag << "Unexpected EOF before 'end' command!" << endl;
exit(1);
}
string &command = *ocommand;
if (verbose) {
cout << reftag << "read <" << command << ">" << endl;
}
auto getPlayer = [this](const string &command, const char *commandName, int prefixLen) {
int player;
try {
player = stoi(command.substr(prefixLen));
} catch (...) {
cout << reftag << "Protocol violation in '" << commandName << "' command!" << endl;
exit(1);
}
if (player < 0 || player >= numPlayers) {
cout << reftag << "Invalid player index " << player << " mentioned in '" << commandName << "' command!" << endl;
exit(1);
}
size_t afterIndex = command.find(' ', prefixLen);
if (afterIndex != string::npos) afterIndex++;
return make_pair(player, afterIndex);
};
if (command.substr(0, 5) == "read ") {
int player = getPlayer(command, "read", 5).first;
return ReadEvent{
player,
[this](const string &line) {
if (verbose) {
cout << reftag << "write <" << line << ">" << endl;
}
if (!proc.writeLine(line, false)) {
cout << reftag << "Referee exited unexpectedly after 'read' command!" << endl;
exit(1);
}
}
};
} else if (command.substr(0, 6) == "write ") {
int player;
size_t afterIndex;
tie(player, afterIndex) = getPlayer(command, "write", 6);
if (afterIndex == string::npos) {
cout << reftag << "Protocol violation in 'write' command: no line!" << endl;
exit(1);
}
return WriteEvent{player, false, command.substr(afterIndex)};
} else if (command.substr(0, 11) == "writemaybe ") {
int player;
size_t afterIndex;
tie(player, afterIndex) = getPlayer(command, "writemaybe", 11);
if (afterIndex == string::npos) {
cout << reftag << "Protocol violation in 'writemaybe' command: no line!" << endl;
exit(1);
}
return WriteEvent{player, true, command.substr(afterIndex)};
} else if (command.substr(0, 8) == "gamelog ") {
int player;
size_t afterIndex;
tie(player, afterIndex) = getPlayer(command, "gamelog", 8);
if (afterIndex == string::npos) {
cout << reftag << "Protocol violation in 'gamelog' command: no line!" << endl;
exit(1);
}
return GamelogEvent{player, command.substr(afterIndex)};
} else if (command.substr(0, 4) == "end ") {
size_t cursor = 4;
vector<int> scores;
while (cursor < command.size()) {
size_t idx = command.find(' ', cursor);
if (idx == string::npos) idx = command.size();
string substr = command.substr(cursor, idx - cursor);
int score;
try {
score = stoi(substr);
} catch (...) {
cout << reftag << "Protocol violation in 'end' command: invalid scores!" << endl;
exit(1);
}
scores.push_back(score);
cursor = idx + 1;
}
proc.terminate();
return EndEvent{move(scores)};
} else if (command.substr(0, 6) == "error ") {
int player;
size_t afterIndex;
tie(player, afterIndex) = getPlayer(command, "error", 6);
if (afterIndex == string::npos) {
cout << reftag << "Protocol violation in 'error' command: no message!" << endl;
exit(1);
}
proc.terminate();
return ErrorEvent{player, command.substr(afterIndex)};
} else {
cout << reftag << "Protocol violation: unknown command '" << command << "'!" << endl;
exit(1);
}
}
void Referee::queryFeatures() {
bool first = true;
while (true) {
optional<string> line;
if (first) {
line = proc.readLineTimeout(FEATURE_TIMEOUT);
if (!line) {
cout << "Referee '" << refereeExecname << "' does not support feature detection!" << endl;
exit(1);
}
first = false;
} else {
line = proc.readLine();
}
if (!line) {
cout << reftag << "EOF!" << endl;
exit(1);
}
if (verbose) {
cout << reftag << "read <" << *line << ">" << endl;
}
if (*line == "feature_end") {
return;
} else if (line->substr(0, 8) == "feature ") {
string featname = line->substr(8);
if (featname == "version_2") features.version2 = true;
else {
cerr << reftag << "Referee requested unsupported feature '" << featname << "'" << endl;
exit(1);
}
} else {
cerr << reftag << "Referee protocol violation in feature negotiation" << endl;
exit(1);
}
}
}
void Referee::terminate() {
proc.terminate();
}
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