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#include <sstream>
#include <unordered_map>
#include <ATen/core/interned_strings.h>
#include <c10/util/thread_name.h>
#include <caffe2/utils/threadpool/WorkersPool.h>
#include <torch/csrc/distributed/c10d/control_plane/WorkerServer.hpp>
#include <torch/csrc/distributed/c10d/logging.h>
// NS: TODO: Use `std::filesystem` regardless of OS when it's possible
// to use it without leaking symbols on PRECXX11 ABI Linux OSes
// See https://github.com/pytorch/pytorch/issues/133437 for more details
#ifdef _WIN32
#include <filesystem>
#else
#include <sys/stat.h>
#endif
namespace c10d::control_plane {
namespace {
class RequestImpl : public Request {
public:
RequestImpl(const httplib::Request& req) : req_(req) {}
const std::string& body() const override {
return req_.body;
}
const std::multimap<std::string, std::string>& params() const override {
return req_.params;
}
private:
const httplib::Request& req_;
};
class ResponseImpl : public Response {
public:
ResponseImpl(httplib::Response& res) : res_(res) {}
void setStatus(int status) override {
res_.status = status;
}
void setContent(std::string&& content, const std::string& content_type)
override {
res_.set_content(std::move(content), content_type);
}
private:
httplib::Response& res_;
};
std::string jsonStrEscape(const std::string& str) {
std::ostringstream ostream;
for (char ch : str) {
if (ch == '"') {
ostream << "\\\"";
} else if (ch == '\\') {
ostream << "\\\\";
} else if (ch == '\b') {
ostream << "\\b";
} else if (ch == '\f') {
ostream << "\\f";
} else if (ch == '\n') {
ostream << "\\n";
} else if (ch == '\r') {
ostream << "\\r";
} else if (ch == '\t') {
ostream << "\\t";
} else if ('\x00' <= ch && ch <= '\x1f') {
ostream << "\\u" << std::hex << std::setw(4) << std::setfill('0')
<< static_cast<int>(ch);
} else {
ostream << ch;
}
}
return ostream.str();
}
bool file_exists(const std::string& path) {
#ifdef _WIN32
return std::filesystem::exists(path);
#else
struct stat rc {};
return lstat(path.c_str(), &rc) == 0;
#endif
}
} // namespace
WorkerServer::WorkerServer(const std::string& hostOrFile, int port) {
server_.Get(
"/",
[](const httplib::Request& req [[maybe_unused]], httplib::Response& res) {
res.set_content(
R"BODY(<h1>torch.distributed.WorkerServer</h1>
<a href="/handler/">Handler names</a>
)BODY",
"text/html");
});
server_.Get(
"/handler/",
[](const httplib::Request& req [[maybe_unused]], httplib::Response& res) {
std::ostringstream body;
body << "[";
bool first = true;
for (const auto& name : getHandlerNames()) {
if (!first) {
body << ",";
}
first = false;
body << "\"" << jsonStrEscape(name) << "\"";
}
body << "]";
res.set_content(body.str(), "application/json");
});
server_.Post(
"/handler/:handler",
[](const httplib::Request& req, httplib::Response& res) {
auto handler_name = req.path_params.at("handler");
HandlerFunc handler;
try {
handler = getHandler(handler_name);
} catch (const std::exception& e) {
res.status = 404;
res.set_content(
fmt::format("Handler {} not found: {}", handler_name, e.what()),
"text/plain");
return;
}
RequestImpl torchReq{req};
ResponseImpl torchRes{res};
try {
handler(torchReq, torchRes);
} catch (const std::exception& e) {
res.status = 500;
res.set_content(
fmt::format("Handler {} failed: {}", handler_name, e.what()),
"text/plain");
return;
} catch (...) {
res.status = 500;
res.set_content(
fmt::format(
"Handler {} failed with unknown exception", handler_name),
"text/plain");
return;
}
});
// adjust keep alives as it stops the server from shutting down quickly
server_.set_keep_alive_timeout(1); // second, default is 5
server_.set_keep_alive_max_count(
30); // wait max 30 seconds before closing socket
if (port == -1) {
// using unix sockets
server_.set_address_family(AF_UNIX);
if (file_exists(hostOrFile)) {
throw std::runtime_error(fmt::format("{} already exists", hostOrFile));
}
C10D_WARNING("Server listening to UNIX {}", hostOrFile);
if (!server_.bind_to_port(hostOrFile, 80)) {
throw std::runtime_error(fmt::format("Error binding to {}", hostOrFile));
}
} else {
C10D_WARNING("Server listening to TCP {}:{}", hostOrFile, port);
if (!server_.bind_to_port(hostOrFile, port)) {
throw std::runtime_error(
fmt::format("Error binding to {}:{}", hostOrFile, port));
}
}
serverThread_ = std::thread([this]() {
c10::setThreadName("pt_workerserver");
try {
if (!server_.listen_after_bind()) {
throw std::runtime_error("failed to listen");
}
} catch (std::exception& e) {
C10D_ERROR("Error while running server: {}", e.what());
throw;
}
C10D_WARNING("Server exited");
});
}
void WorkerServer::shutdown() {
C10D_WARNING("Server shutting down");
server_.stop();
serverThread_.join();
}
WorkerServer::~WorkerServer() {
if (serverThread_.joinable()) {
C10D_WARNING("WorkerServer destructor called without shutdown");
shutdown();
}
}
} // namespace c10d::control_plane
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