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// Copyright 2018 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// 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.
#include "cc/gtp_client.h"
#include <algorithm>
#include <cmath>
#include <iostream>
#include <limits>
#include <thread>
#include <utility>
#include "absl/strings/numbers.h"
#include "absl/strings/str_join.h"
#include "absl/strings/str_split.h"
#include "cc/constants.h"
#include "cc/file/utils.h"
#include "cc/logging.h"
#include "cc/model/loader.h"
#include "cc/sgf.h"
namespace minigo {
GtpClient::GtpClient(std::string device,
std::shared_ptr<InferenceCache> inference_cache,
const std::string& model_path,
const Game::Options& game_options,
const MctsPlayer::Options& player_options,
const GtpClient::Options& client_options)
: inference_cache_(inference_cache),
options_(client_options),
device_(std::move(device)) {
auto model = NewModel(model_path, device_);
game_ = absl::make_unique<Game>(model->name(), model->name(), game_options);
// Create the main player. Its model doesn't run through the batcher used for
// background inferences.
player_ = absl::make_unique<MctsPlayer>(std::move(model), inference_cache,
game_.get(), player_options);
if (options_.ponder_limit > 0) {
ponder_type_ = PonderType::kReadLimited;
}
RegisterCmd("benchmark", &GtpClient::HandleBenchmark);
RegisterCmd("boardsize", &GtpClient::HandleBoardsize);
RegisterCmd("clear_board", &GtpClient::HandleClearBoard);
RegisterCmd("final_score", &GtpClient::HandleFinalScore);
RegisterCmd("genmove", &GtpClient::HandleGenmove);
RegisterCmd("known_command", &GtpClient::HandleKnownCommand);
RegisterCmd("komi", &GtpClient::HandleKomi);
RegisterCmd("list_commands", &GtpClient::HandleListCommands);
RegisterCmd("loadsgf", &GtpClient::HandleLoadsgf);
RegisterCmd("name", &GtpClient::HandleName);
RegisterCmd("play", &GtpClient::HandlePlay);
RegisterCmd("ponder", &GtpClient::HandlePonder);
RegisterCmd("readouts", &GtpClient::HandleReadouts);
RegisterCmd("showboard", &GtpClient::HandleShowboard);
RegisterCmd("undo", &GtpClient::HandleUndo);
}
GtpClient::~GtpClient() = default;
void GtpClient::Run() {
// Perform a warm-up inference: ML frameworks like TensorFlow often perform
// lazy initialization, causing the first inference to take substantially
// longer than subsequent ones, which can interfere with time keeping.
MG_LOG(INFO) << "Warming up...";
Position position(Color::kBlack);
ModelOutput output;
ModelInput input;
input.sym = symmetry::kIdentity;
input.position_history.push_back(&position);
std::vector<const ModelInput*> inputs = {&input};
std::vector<ModelOutput*> outputs = {&output};
player_->model()->RunMany(inputs, &outputs, nullptr);
MG_LOG(INFO) << "GTP engine ready";
// Start a background thread that pushes lines read from stdin into the
// thread safe stdin_queue_. This allows us to ponder when there's nothing
// to read from stdin.
std::atomic<bool> running(true);
std::thread stdin_thread([this, &running]() {
std::string line;
while (std::cin) {
std::getline(std::cin, line);
stdin_queue_.Push(line);
}
running = false;
});
// Don't wait for the stdin reading thread to exit because there's no way to
// abort the blocking call std::getline read (apart from the user hitting
// ctrl-C). The OS will clean the thread up when the process exits.
stdin_thread.detach();
NewGame();
while (running) {
std::string line;
// If there's a command waiting on stdin, process it.
if (stdin_queue_.TryPop(&line)) {
auto response = HandleCmd(line);
std::cout << response << std::flush;
if (response.done) {
break;
}
continue;
}
// Otherwise, ponder if enabled.
if (!MaybePonder()) {
// If pondering isn't enabled, try and pop a command from stdin with a
// short timeout. The timeout gives us a chance to break out of the loop
// when stdin is closed with ctrl-C.
if (stdin_queue_.PopWithTimeout(&line, absl::Seconds(1))) {
auto response = HandleCmd(line);
std::cout << response << std::flush;
if (response.done) {
break;
}
}
}
}
running = false;
}
void GtpClient::NewGame() {
player_->NewGame();
MaybeStartPondering();
}
void GtpClient::MaybeStartPondering() {
if (ponder_type_ != PonderType::kOff) {
ponder_limit_reached_ = false;
ponder_read_count_ = 0;
if (ponder_type_ == PonderType::kTimeLimited) {
ponder_time_limit_ = absl::Now() + ponder_duration_;
}
}
}
bool GtpClient::MaybePonder() {
if (player_->root()->game_over() || ponder_type_ == PonderType::kOff ||
ponder_limit_reached_) {
return false;
}
// Check if we're finished pondering.
if ((ponder_type_ == PonderType::kReadLimited &&
ponder_read_count_ >= options_.ponder_limit) ||
(ponder_type_ == PonderType::kTimeLimited &&
absl::Now() >= ponder_time_limit_)) {
if (!ponder_limit_reached_) {
MG_LOG(INFO) << "mg-ponder: done";
ponder_limit_reached_ = true;
}
return false;
}
Ponder();
return true;
}
void GtpClient::Ponder() {
// Remember the number of reads at the root.
int n = player_->root()->N();
player_->TreeSearch(player_->options().virtual_losses,
std::numeric_limits<int>::max());
// Increment the ponder count by difference new and old reads.
ponder_read_count_ += player_->root()->N() - n;
}
GtpClient::Response GtpClient::ReplaySgf(const sgf::Collection& collection) {
if (!collection.trees.empty()) {
for (const auto& move : collection.trees[0]->ExtractMainLine()) {
if (!player_->PlayMove(move.c)) {
MG_LOG(ERROR) << "Couldn't play move " << move.c;
return Response::Error("Cannot load file");
}
}
}
return Response::Ok();
}
GtpClient::Response GtpClient::HandleCmd(const std::string& line) {
std::vector<absl::string_view> args =
absl::StrSplit(line, absl::ByAnyChar(" \t\r\n"), absl::SkipWhitespace());
if (args.empty()) {
return Response::Ok();
}
// Split the GTP into possible ID, command and arguments.
int cmd_id;
bool has_cmd_id = absl::SimpleAtoi(args[0], &cmd_id);
if (has_cmd_id) {
args.erase(args.begin());
}
auto cmd = std::string(args[0]);
args.erase(args.begin());
// Process the command.
Response response;
if (cmd == "quit") {
response = Response::Done();
} else {
response = DispatchCmd(cmd, args);
}
// Set the command ID on the response if we have one.
if (has_cmd_id) {
response.set_cmd_id(cmd_id);
}
return response;
}
GtpClient::Response GtpClient::CheckArgsExact(size_t expected_num_args,
CmdArgs args) {
if (args.size() != expected_num_args) {
return Response::Error("expected ", expected_num_args, " args, got ",
args.size(), " args: ", absl::StrJoin(args, " "));
}
return Response::Ok();
}
GtpClient::Response GtpClient::CheckArgsRange(size_t expected_min_args,
size_t expected_max_args,
CmdArgs args) {
if (args.size() < expected_min_args || args.size() > expected_max_args) {
return Response::Error("expected between ", expected_min_args, " and ",
expected_max_args, " args, got ", args.size(),
" args: ", absl::StrJoin(args, " "));
}
return Response::Ok();
}
GtpClient::Response GtpClient::DispatchCmd(const std::string& cmd,
CmdArgs args) {
auto it = cmd_handlers_.find(cmd);
if (it == cmd_handlers_.end()) {
return Response::Error("unknown command");
}
return it->second(args);
}
GtpClient::Response GtpClient::HandleBenchmark(CmdArgs args) {
// benchmark [readouts] [virtual_losses]
// Note: By default use current time_control (readouts or time).
auto response = CheckArgsRange(0, 2, args);
if (!response.ok) {
return response;
}
auto saved_options = player_->options();
auto temp_options = saved_options;
if (!args.empty()) {
temp_options.seconds_per_move = 0;
if (!absl::SimpleAtoi(args[0], &temp_options.num_readouts)) {
return Response::Error("bad num_readouts");
}
}
if (args.size() == 2) {
if (!absl::SimpleAtoi(args[1], &temp_options.virtual_losses)) {
return Response::Error("bad virtual_losses");
}
}
player_->SetOptions(temp_options);
player_->SuggestMove(temp_options.num_readouts);
player_->SetOptions(saved_options);
return Response::Ok();
}
GtpClient::Response GtpClient::HandleBoardsize(CmdArgs args) {
auto response = CheckArgsExact(1, args);
if (!response.ok) {
return response;
}
int x;
if (!absl::SimpleAtoi(args[0], &x) || x != kN) {
return Response::Error("unacceptable size");
}
return Response::Ok();
}
GtpClient::Response GtpClient::HandleClearBoard(CmdArgs args) {
auto response = CheckArgsExact(0, args);
if (!response.ok) {
return response;
}
NewGame();
return Response::Ok();
}
GtpClient::Response GtpClient::HandleFinalScore(CmdArgs args) {
auto response = CheckArgsExact(0, args);
if (!response.ok) {
return response;
}
if (!game_->game_over()) {
// Game isn't over yet, calculate the current score using Tromp-Taylor
// scoring.
return Response::Ok(Game::FormatScore(
player_->root()->position.CalculateScore(game_->options().komi)));
} else {
// Game is over, we have the result available.
return Response::Ok(game_->result_string());
}
}
GtpClient::Response GtpClient::HandleGenmove(CmdArgs args) {
auto response = CheckArgsRange(0, 1, args);
if (!response.ok) {
return response;
}
if (player_->root()->game_over()) {
return Response::Error("game is over");
}
// TODO(tommadams): Handle out of turn moves.
Coord c = Coord::kInvalid;
if (options_.courtesy_pass && player_->root()->move == Coord::kPass) {
c = Coord::kPass;
} else {
if (!options_.tree_reuse) {
player_->ClearSubtrees();
}
c = player_->SuggestMove(player_->options().num_readouts);
}
MG_LOG(INFO) << player_->tree().Describe();
MG_CHECK(player_->PlayMove(c));
MaybeStartPondering();
return Response::Ok(c.ToGtp());
}
GtpClient::Response GtpClient::HandleKnownCommand(CmdArgs args) {
auto response = CheckArgsExact(1, args);
if (!response.ok) {
return response;
}
std::string result;
if (cmd_handlers_.find(std::string(args[0])) != cmd_handlers_.end()) {
result = "true";
} else {
result = "false";
}
return Response::Ok(result);
}
GtpClient::Response GtpClient::HandleKomi(CmdArgs args) {
auto response = CheckArgsExact(1, args);
if (!response.ok) {
return response;
}
double x;
if (!absl::SimpleAtod(args[0], &x) || x != game_->options().komi) {
return Response::Error("unacceptable komi");
}
return Response::Ok();
}
GtpClient::Response GtpClient::HandleListCommands(CmdArgs args) {
auto response = CheckArgsExact(0, args);
if (!response.ok) {
return response;
}
std::vector<absl::string_view> cmds;
for (const auto& kv : cmd_handlers_) {
cmds.push_back(kv.first);
}
std::sort(cmds.begin(), cmds.end());
response.str = absl::StrJoin(cmds, "\n");
return response;
}
GtpClient::Response GtpClient::HandleLoadsgf(CmdArgs args) {
auto response = CheckArgsExact(1, args);
if (!response.ok) {
return response;
}
std::string contents;
if (!file::ReadFile(std::string(args[0]), &contents)) {
return Response::Error("cannot load file");
}
sgf::Collection collection;
std::string error;
if (!sgf::Parse(contents, &collection, &error)) {
MG_LOG(ERROR) << "couldn't parse SGF: " << error;
return Response::Error("cannot load file");
}
NewGame();
return ReplaySgf(collection);
}
GtpClient::Response GtpClient::HandleName(CmdArgs args) {
auto response = CheckArgsExact(0, args);
if (!response.ok) {
return response;
}
return Response::Ok(absl::StrCat("minigo-", player_->model()->name()));
}
GtpClient::Response GtpClient::HandlePlay(CmdArgs args) {
auto response = CheckArgsExact(2, args);
if (!response.ok) {
return response;
}
if (player_->root()->game_over()) {
return Response::Error("game is over");
}
Color color;
if (std::tolower(args[0][0]) == 'b') {
color = Color::kBlack;
} else if (std::tolower(args[0][0]) == 'w') {
color = Color::kWhite;
} else {
MG_LOG(ERROR) << "expected b or w for player color, got " << args[0];
return Response::Error("illegal move");
}
if (color != player_->root()->position.to_play()) {
return Response::Error("out of turn moves are not yet supported");
}
Coord c = Coord::FromGtp(args[1], true);
if (c == Coord::kInvalid) {
MG_LOG(ERROR) << "expected GTP coord for move, got " << args[1];
return Response::Error("illegal move");
}
if (!player_->PlayMove(c)) {
return Response::Error("illegal move");
}
return Response::Ok();
}
GtpClient::Response GtpClient::HandlePonder(CmdArgs args) {
auto response = CheckArgsRange(1, 2,
8980
args);
if (!response.ok) {
return response;
}
if (args[0] == "off") {
// Disable pondering.
ponder_type_ = PonderType::kOff;
ponder_read_count_ = 0;
options_.ponder_limit = 0;
ponder_duration_ = {};
ponder_time_limit_ = absl::InfinitePast();
ponder_limit_reached_ = true;
return Response::Ok();
}
// Subsequent sub commands require exactly 2 arguments.
response = CheckArgsExact(2, args);
if (!response.ok) {
return response;
}
if (args[0] == "reads") {
// Enable pondering limited by number of reads.
int read_limit;
if (!absl::SimpleAtoi(args[1], &read_limit) || read_limit <= 0) {
return Response::Error("couldn't parse read limit");
}
options_.ponder_limit = read_limit;
ponder_type_ = PonderType::kReadLimited;
ponder_read_count_ = 0;
ponder_limit_reached_ = false;
return Response::Ok();
}
if (args[0] == "time") {
// Enable pondering limited by time.
float duration;
if (!absl::SimpleAtof(args[1], &duration) || duration <= 0) {
return Response::Error("couldn't parse time limit");
}
ponder_type_ = PonderType::kTimeLimited;
ponder_duration_ = absl::Seconds(duration);
ponder_time_limit_ = absl::Now() + ponder_duration_;
ponder_limit_reached_ = false;
return Response::Ok();
}
return Response::Error("unrecognized ponder mode");
}
GtpClient::Response GtpClient::HandleReadouts(CmdArgs args) {
auto response = CheckArgsExact(1, args);
if (!response.ok) {
return response;
}
int x;
if (!absl::SimpleAtoi(args[0], &x) || x <= 0) {
return Response::Error("couldn't parse ", args[0], " as an integer > 0");
} else {
auto options = player_->options();
options.num_readouts = x;
player_->SetOptions(options);
}
return Response::Ok();
}
GtpClient::Response GtpClient::HandleShowboard(CmdArgs args) {
auto response = CheckArgsExact(0, args);
if (!response.ok) {
return response;
}
return Response::Ok(
absl::StrCat("\n", player_->root()->position.ToPrettyString(false)));
}
GtpClient::Response GtpClient::HandleUndo(CmdArgs args) {
auto response = CheckArgsExact(0, args);
if (!response.ok) {
return response;
}
if (!player_->UndoMove()) {
return Response::Error("cannot undo");
}
if (!options_.tree_reuse) {
player_->ClearSubtrees();
}
return Response::Ok();
}
} // namespace minigo