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// Copyright 2018 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#include "http_connection.h"
#include <vespa/vespalib/data/output_writer.h>
#include <cassert>
namespace vespalib::portal {
namespace {
constexpr size_t CHUNK_SIZE = 4096;
enum class ReadRes { OK, END, FAIL };
enum class WriteRes { OK, BLOCKED, FAIL };
bool is_blocked(int res) {
return ((res == -1) && ((errno == EWOULDBLOCK) || (errno == EAGAIN)));
}
ReadRes drain(CryptoSocket &socket, SmartBuffer &buffer) {
size_t chunk_size = std::max(CHUNK_SIZE, socket.min_read_buffer_size());
for (;;) {
auto chunk = buffer.reserve(chunk_size);
auto res = socket.drain(chunk.data, chunk.size);
if (res > 0) {
buffer.commit(res);
} else if (res == 0) {
return ReadRes::OK;
} else {
return ReadRes::FAIL;
}
}
}
ReadRes read(CryptoSocket &socket, SmartBuffer &buffer) {
size_t chunk_size = std::max(CHUNK_SIZE, socket.min_read_buffer_size());
auto chunk = buffer.reserve(chunk_size);
auto res = socket.read(chunk.data, chunk.size);
if (res > 0) {
buffer.commit(res);
} else if (res == 0) {
return ReadRes::END;
} else if (is_blocked(res)) {
return ReadRes::OK;
} else {
return ReadRes::FAIL;
}
return drain(socket, buffer);
}
WriteRes flush(CryptoSocket &socket) {
for (;;) {
auto res = socket.flush();
if (res > 0) {
// flush more
} else if (res == 0) {
return WriteRes::OK;
} else if (is_blocked(res)) {
return WriteRes::BLOCKED;
} else {
return WriteRes::FAIL;
}
}
}
WriteRes write(CryptoSocket &socket, SmartBuffer &buffer) {
auto chunk = buffer.obtain();
if (chunk.size > 0) {
auto res = socket.write(chunk.data, chunk.size);
if (res > 0) {
buffer.evict(res);
} else if (is_blocked(res)) {
return WriteRes::BLOCKED;
} else {
assert(res < 0);
return WriteRes::FAIL;
}
}
return flush(socket);
}
WriteRes half_close(CryptoSocket &socket) {
auto res = socket.half_close();
if (res == 0) {
return WriteRes::OK;
} else if (is_blocked(res)) {
return WriteRes::BLOCKED;
} else {
return WriteRes::FAIL;
}
}
} // namespace vespalib::portal::<unnamed>
void
HttpConnection::set_state(State state, bool read, bool write)
{
_token->update(read, write);
_state = state;
}
void
HttpConnection::do_handshake()
{
for (;;) {
switch (_socket->handshake()) {
case vespalib::CryptoSocket::HandshakeResult::FAIL: return set_state(State::NOTIFY, false, false);
case vespalib::CryptoSocket::HandshakeResult::DONE: return set_state(State::READ_REQUEST, true, false);
case vespalib::CryptoSocket::HandshakeResult::NEED_READ: return set_state(State::HANDSHAKE, true, false);
case vespalib::CryptoSocket::HandshakeResult::NEED_WRITE: return set_state(State::HANDSHAKE, false, true);
case vespalib::CryptoSocket::HandshakeResult::NEED_WORK: _socket->do_handshake_work();
}
}
}
void
HttpConnection::do_read_request()
{
if (read(*_socket, _input) != ReadRes::OK) {
return set_state(State::NOTIFY, false, false);
}
auto data = _input.obtain();
auto consumed = _request.handle_data(data.data, data.size);
_input.evict(consumed);
if (!_request.need_more_data()) {
set_state(State::DISPATCH, false, false);
}
}
void
HttpConnection::do_dispatch()
{
set_state(State::WAIT, false, false);
return _handler(this); // callback is final touch
}
void
HttpConnection::do_wait()
{
if (_reply_ready) {
set_state(State::WRITE_REPLY, false, true);
}
}
void
HttpConnection::do_write_reply()
{
if (write(*_socket, _output) == WriteRes::FAIL) {
return set_state(State::NOTIFY, false, false);
}
if (_output.obtain().size == 0) {
set_state(State::CLOSE, false, true);
}
}
void
HttpConnection::do_close()
{
if (half_close(*_socket) != WriteRes::BLOCKED) {
set_state(State::NOTIFY, false, false);
}
}
void
HttpConnection::do_notify()
{
set_state(State::END, false, false);
return _handler(this); // callback is final touch
}
HttpConnection::HttpConnection(HandleGuard guard, Reactor &reactor, CryptoSocket::UP socket, handler_fun_t handler)
: _guard(std::move(guard)),
_state(State::HANDSHAKE),
_socket(std::move(socket)),
_input(CHUNK_SIZE * 2),
_output(CHUNK_SIZE * 2),
_request(),
_handler(std::move(handler)),
_reply_ready(false),
_token()
{
_token = reactor.attach(*this, _socket->get_fd(), true, true);
}
HttpConnection::~HttpConnection()
{
_token.reset();
}
void
HttpConnection::handle_event(bool, bool)
{
if (_state == State::HANDSHAKE) {
do_handshake();
}
if (_state == State::READ_REQUEST) {
do_read_request();
}
if (_state == State::DISPATCH) {
return do_dispatch(); // callback is final touch
}
if (_state == State::WAIT) {
do_wait();
}
if (_state == State::WRITE_REPLY) {
do_write_reply();
}
if (_state == State::CLOSE) {
do_close();
}
if (_state == State::NOTIFY) {
return do_notify(); // callback is final touch
}
}
void
HttpConnection::respond_with_content(const vespalib::string &content_type,
const vespalib::string &content)
{
{
OutputWriter dst(_output, CHUNK_SIZE);
dst.printf("HTTP/1.1 200 OK\r\n");
dst.printf("Connection: close\r\n");
dst.printf("Content-Type: %s\r\n", content_type.c_str());
dst.printf("Content-Length: %zu\r\n", content.size());
dst.printf("\r\n");
dst.write(content.data(), content.size());
}
_reply_ready = true;
_token->update(false, true);
}
void
HttpConnection::respond_with_error(int code, const vespalib::string &msg)
{
{
OutputWriter dst(_output, CHUNK_SIZE);
dst.printf("HTTP/1.1 %d %s\r\n", code, msg.c_str());
dst.printf("Connection: close\r\n");
dst.printf("\r\n");
}
_reply_ready = true;
_token->update(false, true);
}
} // namespace vespalib::portal
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