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235 lines
6.5 KiB
C++
235 lines
6.5 KiB
C++
#include "webcc/connection.h"
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#include <utility>
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#include "boost/asio/write.hpp"
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#include "webcc/connection_pool.h"
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#include "webcc/logger.h"
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#include "connection.h"
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using boost::asio::ip::tcp;
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namespace webcc {
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Connection::Connection(tcp::socket socket, ConnectionPool* pool,
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Queue<ConnectionPtr>* queue, ViewMatcher&& view_matcher,
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std::size_t buffer_size)
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: socket_(std::move(socket)), pool_(pool), queue_(queue),
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view_matcher_(std::move(view_matcher)), buffer_(buffer_size) {
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}
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void Connection::Start() {
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request_.reset(new Request{});
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boost::system::error_code ec;
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auto endpoint = socket_.remote_endpoint(ec);
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if (!ec) {
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request_->set_address(endpoint.address().to_string());
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}
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request_parser_.Init(request_.get(), view_matcher_);
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AsyncRead();
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}
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void Connection::Close() {
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LOG_INFO("Shutdown socket");
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// Initiate graceful connection closure.
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// Socket close VS. shutdown:
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// https://stackoverflow.com/questions/4160347/close-vs-shutdown-socket
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boost::system::error_code ec;
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socket_.shutdown(tcp::socket::shutdown_both, ec);
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if (ec) {
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LOG_WARN("Socket shutdown error (%s)", ec.message().c_str());
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ec.clear();
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// Don't return, try to close the socket anywhere.
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}
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LOG_INFO("Close socket");
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socket_.close(ec);
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if (ec) {
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LOG_ERRO("Socket close error (%s)", ec.message().c_str());
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}
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}
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void Connection::SendResponse(ResponsePtr response, bool no_keep_alive) {
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assert(response);
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response_ = response;
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if (!no_keep_alive && request_->IsConnectionKeepAlive()) {
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response_->SetHeader(headers::kConnection, "Keep-Alive");
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} else {
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response_->SetHeader(headers::kConnection, "Close");
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}
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response_->Prepare();
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AsyncWrite();
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}
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void Connection::SendResponse(Status status, bool no_keep_alive) {
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auto response = std::make_shared<Response>(status);
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// According to the testing based on HTTPie (and Chrome), the `Content-Length`
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// header is expected for a response with status like 404 even when the body
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// is empty.
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response->SetBody(std::make_shared<Body>(), true);
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SendResponse(response, no_keep_alive);
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}
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void Connection::SendResponse(Status status, std::string server_name,
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bool no_keep_alive) {
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auto response = std::make_shared<Response>(status);
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// According to the testing based on HTTPie (and Chrome), the `Content-Length`
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// header is expected for a response with status like 404 even when the body
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// is empty.
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response->SetBody(std::make_shared<Body>(), true);
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response->SetHeader(headers::kServer, server_name);
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SendResponse(response, no_keep_alive);
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}
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void Connection::AsyncRead() {
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#if WEBCC_STUDY_SERVER_THREADING
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LOG_USER("[%u] AsyncRead()", (unsigned int)this);
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#endif
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socket_.async_read_some(boost::asio::buffer(buffer_),
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std::bind(&Connection::OnRead, shared_from_this(),
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std::placeholders::_1,
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std::placeholders::_2));
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}
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void Connection::OnRead(boost::system::error_code ec, std::size_t length) {
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#if WEBCC_STUDY_SERVER_THREADING
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LOG_USER("[%u] OnRead()", (unsigned int)this);
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#endif
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if (ec) {
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if (ec == boost::asio::error::eof) {
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LOG_INFO("Socket read EOF (%s)", ec.message().c_str());
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} else if (ec == boost::asio::error::operation_aborted) {
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// The socket of this connection has been closed.
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// This happens, e.g., when the server was stopped by a signal (Ctrl-C).
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LOG_WARN("Socket operation aborted (%s)", ec.message().c_str());
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} else {
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LOG_ERRO("Socket read error (%s)", ec.message().c_str());
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}
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// Don't try to send any response back.
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if (ec != boost::asio::error::operation_aborted) {
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pool_->Close(shared_from_this());
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} // else: The socket of this connection has already been closed.
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return;
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}
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if (!request_parser_.Parse(buffer_.data(), length)) {
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LOG_ERRO("Failed to parse request");
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// Send Bad Request (400) to the client and no Keep-Alive.
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SendResponse(Status::kBadRequest, true);
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// Close the socket connection.
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pool_->Close(shared_from_this());
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return;
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}
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if (!request_parser_.finished()) {
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// Continue to read the request.
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AsyncRead();
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return;
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}
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LOG_VERB("Request:\n%s", request_->Dump().c_str());
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// Enqueue this connection once the request has been read.
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// Some worker thread will handle the request later.
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queue_->Push(shared_from_this());
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}
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void Connection::AsyncWrite() {
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#if WEBCC_STUDY_SERVER_THREADING
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LOG_USER("[%u] AsyncWrite()", (unsigned int)this);
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#endif
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LOG_VERB("Response:\n%s", response_->Dump().c_str());
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// Firstly, write the headers.
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boost::asio::async_write(socket_, response_->GetPayload(),
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std::bind(&Connection::OnWriteHeaders,
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shared_from_this(), std::placeholders::_1,
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std::placeholders::_2));
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}
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void Connection::OnWriteHeaders(boost::system::error_code ec,
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std::size_t length) {
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#if WEBCC_STUDY_SERVER_THREADING
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LOG_USER("[%u] OnWriteHeaders()", (unsigned int)this);
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#endif
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if (ec) {
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HandleWriteError(ec);
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} else {
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// Write the body payload by payload.
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response_->body()->InitPayload();
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AsyncWriteBody();
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}
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}
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void Connection::AsyncWriteBody() {
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auto payload = response_->body()->NextPayload();
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if (!payload.empty()) {
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boost::asio::async_write(socket_, payload,
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std::bind(&Connection::OnWriteBody,
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shared_from_this(),
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std::placeholders::_1,
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std::placeholders::_2));
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} else {
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// No more body payload left, we're done.
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HandleWriteOK();
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}
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}
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void Connection::OnWriteBody(boost::system::error_code ec, std::size_t length) {
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#if WEBCC_STUDY_SERVER_THREADING
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LOG_USER("[%u] OnWriteBody()", (unsigned int)this);
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#endif
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if (ec) {
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HandleWriteError(ec);
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} else {
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AsyncWriteBody();
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}
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}
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void Connection::HandleWriteOK() {
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LOG_INFO("Response has been sent back");
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if (request_->IsConnectionKeepAlive()) {
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LOG_INFO("The client asked for a keep-alive connection");
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LOG_INFO("Continue to read the next request");
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Start();
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} else {
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pool_->Close(shared_from_this());
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}
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}
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void Connection::HandleWriteError(boost::system::error_code ec) {
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LOG_ERRO("Socket write error (%s)", ec.message().c_str());
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if (ec != boost::asio::error::operation_aborted) {
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pool_->Close(shared_from_this());
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}
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}
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} // namespace webcc
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