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#pragma once
#include <functional>
#include <map>
#include <string>
#include <utility>
#include <c10/macros/Export.h>
namespace c10d::control_plane {
// Request represents a request to the handler. This conceptually maps to an
// HTTP request but could be called via other transports.
class TORCH_API Request {
public:
virtual ~Request() = default;
virtual const std::string& body() const = 0;
virtual const std::multimap<std::string, std::string>& params() const = 0;
};
// Response represents a response to the handler. This conceptually maps to an
// HTTP response but could be called via other transports.
class TORCH_API Response {
public:
virtual ~Response() = default;
// Set the response body to the provided string.
// TODO: add support for chunked responses
virtual void setContent(
std::string&& content,
const std::string& content_type) = 0;
// Set the response status code.
// These should match standard HTTP status codes.
virtual void setStatus(int status) = 0;
};
using HandlerFunc = std::function<void(const Request&, Response&)>;
// Registers a handler. The name needs to be unique and can be called by using
// getHandler directly or via WorkerServer for remote requests.
// These handlers are called from a background C++ thread concurrently with the
// main thread. These handlers need to be thread safe and not cause issues
// during Python training.
TORCH_API void registerHandler(const std::string& name, HandlerFunc f);
// Fetches a handler by name.
TORCH_API HandlerFunc getHandler(const std::string& name);
TORCH_API std::vector<std::string> getHandlerNames();
// Registers a handler statically.
// See registerHandler for more details.
class TORCH_API RegisterHandler {
public:
RegisterHandler(const std::string& name, HandlerFunc f) {
registerHandler(name, std::move(f));
}
// disable move, copy
RegisterHandler(const RegisterHandler&) = delete;
RegisterHandler(RegisterHandler&&) = delete;
RegisterHandler& operator=(const RegisterHandler&) = delete;
RegisterHandler& operator=(RegisterHandler&&) = delete;
};
} // namespace c10d::control_plane
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