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gStore/Server/server_http.hpp

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#ifndef SERVER_HTTP_HPP
#define SERVER_HTTP_HPP
#include "../Util/Util.h"
#ifndef CASE_INSENSITIVE_EQUALS_AND_HASH
#define CASE_INSENSITIVE_EQUALS_AND_HASH
//Based on http://www.boost.org/doc/libs/1_60_0/doc/html/unordered/hash_equality.html
class case_insensitive_equals {
public:
bool operator()(const std::string &key1, const std::string &key2) const {
return boost::algorithm::iequals(key1, key2);
}
};
class case_insensitive_hash {
public:
size_t operator()(const std::string &key) const {
std::size_t seed=0;
for(auto &c: key)
boost::hash_combine(seed, std::tolower(c));
return seed;
}
};
#endif
// Late 2017 TODO: remove the following checks and always use std::regex
#ifdef USE_BOOST_REGEX
#include <boost/regex.hpp>
#define REGEX_NS boost
#else
#include <regex>
#define REGEX_NS std
#endif
// TODO when switching to c++14, use [[deprecated]] instead
#ifndef DEPRECATED
#ifdef __GNUC__
#define DEPRECATED __attribute__((deprecated))
#elif defined(_MSC_VER)
#define DEPRECATED __declspec(deprecated)
#else
#define DEPRECATED
#endif
#endif
namespace SimpleWeb {
template <class socket_type>
class Server;
template <class socket_type>
class ServerBase {
public:
virtual ~ServerBase() {}
class Response : public std::ostream {
friend class ServerBase<socket_type>;
boost::asio::streambuf streambuf;
std::shared_ptr<socket_type> socket;
Response(const std::shared_ptr<socket_type> &socket): std::ostream(&streambuf), socket(socket) {}
public:
size_t size() {
return streambuf.size();
}
/// If true, force server to close the connection after the response have been sent.
///
/// This is useful when implementing a HTTP/1.0-server sending content
/// without specifying the content length.
bool close_connection_after_response = false;
};
class Content : public std::istream {
friend class ServerBase<socket_type>;
public:
size_t size() {
return streambuf.size();
}
std::string string() {
std::stringstream ss;
ss << rdbuf();
return ss.str();
}
private:
boost::asio::streambuf &streambuf;
Content(boost::asio::streambuf &streambuf): std::istream(&streambuf), streambuf(streambuf) {}
};
class Request {
friend class ServerBase<socket_type>;
friend class Server<socket_type>;
public:
std::string method, path, http_version;
Content content;
std::unordered_multimap<std::string, std::string, case_insensitive_hash, case_insensitive_equals> header;
REGEX_NS::smatch path_match;
std::string remote_endpoint_address;
unsigned short remote_endpoint_port;
private:
Request(const socket_type &socket): content(streambuf) {
try {
remote_endpoint_address=socket.lowest_layer().remote_endpoint().address().to_string();
remote_endpoint_port=socket.lowest_layer().remote_endpoint().port();
}
catch(...) {}
}
boost::asio::streambuf streambuf;
};
class Config {
friend class ServerBase<socket_type>;
Config(unsigned short port): port(port) {}
public:
/// Port number to use. Defaults to 80 for HTTP and 443 for HTTPS.
unsigned short port;
/// Number of threads that the server will use when start() is called. Defaults to 1 thread.
size_t thread_pool_size=1;
/// Timeout on request handling. Defaults to 5 seconds.
size_t timeout_request=5;
/// Timeout on content handling. Defaults to 300 seconds.
size_t timeout_content=300;
/// IPv4 address in dotted decimal form or IPv6 address in hexadecimal notation.
/// If empty, the address will be any address.
std::string address;
/// Set to false to avoid binding the socket to an address that is already in use. Defaults to true.
bool reuse_address=true;
};
///Set before calling start().
Config config;
private:
class regex_orderable : public REGEX_NS::regex {
std::string str;
public:
regex_orderable(const char *regex_cstr) : REGEX_NS::regex(regex_cstr), str(regex_cstr) {}
regex_orderable(const std::string &regex_str) : REGEX_NS::regex(regex_str), str(regex_str) {}
bool operator<(const regex_orderable &rhs) const {
return str<rhs.str;
}
};
public:
/// Warning: do not add or remove resources after start() is called
std::map<regex_orderable, std::map<std::string,
std::function<void(std::shared_ptr<typename ServerBase<socket_type>::Response>, std::shared_ptr<typename ServerBase<socket_type>::Request>)> > > resource;
std::map<std::string,
std::function<void(std::shared_ptr<typename ServerBase<socket_type>::Response>, std::shared_ptr<typename ServerBase<socket_type>::Request>)> > default_resource;
std::function<void(std::shared_ptr<typename ServerBase<socket_type>::Request>, const boost::system::error_code&)> on_error;
std::function<void(std::shared_ptr<socket_type> socket, std::shared_ptr<typename ServerBase<socket_type>::Request>)> on_upgrade;
virtual void start() {
if(!io_service)
io_service=std::make_shared<boost::asio::io_service>();
if(io_service->stopped())
io_service->reset();
boost::asio::ip::tcp::endpoint endpoint;
if(config.address.size()>0)
endpoint=boost::asio::ip::tcp::endpoint(boost::asio::ip::address::from_string(config.address), config.port);
else
endpoint=boost::asio::ip::tcp::endpoint(boost::asio::ip::tcp::v4(), config.port);
if(!acceptor)
acceptor=std::unique_ptr<boost::asio::ip::tcp::acceptor>(new boost::asio::ip::tcp::acceptor(*io_service));
acceptor->open(endpoint.protocol());
acceptor->set_option(boost::asio::socket_base::reuse_address(config.reuse_address));
acceptor->bind(endpoint);
acceptor->listen();
accept();
//If thread_pool_size>1, start m_io_service.run() in (thread_pool_size-1) threads for thread-pooling
threads.clear();
for(size_t c=1;c<config.thread_pool_size;c++) {
threads.emplace_back([this]() {
io_service->run();
});
}
//Main thread
if(config.thread_pool_size>0)
io_service->run();
//Wait for the rest of the threads, if any, to finish as well
for(auto& t: threads) {
t.join();
}
}
void stop() {
acceptor->close();
if(config.thread_pool_size>0)
io_service->stop();
}
///Use this function if you need to recursively send parts of a longer message
void send(const std::shared_ptr<Response> &response, const std::function<void(const boost::system::error_code&)>& callback=nullptr) const {
boost::asio::async_write(*response->socket, response->streambuf, [this, response, callback](const boost::system::error_code& ec, size_t /*bytes_transferred*/) {
if(callback)
callback(ec);
});
}
/// If you have your own boost::asio::io_service, store its pointer here before running start().
/// You might also want to set config.thread_pool_size to 0.
std::shared_ptr<boost::asio::io_service> io_service;
protected:
std::unique_ptr<boost::asio::ip::tcp::acceptor> acceptor;
std::vector<std::thread> threads;
ServerBase(unsigned short port) : config(port) {}
virtual void accept()=0;
std::shared_ptr<boost::asio::deadline_timer> get_timeout_timer(const std::shared_ptr<socket_type> &socket, long seconds) {
if(seconds==0)
return nullptr;
auto timer=std::make_shared<boost::asio::deadline_timer>(*io_service);
timer->expires_from_now(boost::posix_time::seconds(seconds));
timer->async_wait([socket](const boost::system::error_code& ec){
if(!ec) {
boost::system::error_code ec;
socket->lowest_layer().shutdown(boost::asio::ip::tcp::socket::shutdown_both, ec);
socket->lowest_layer().close();
}
});
return timer;
}
void read_request_and_content(const std::shared_ptr<socket_type> &socket) {
//Create new streambuf (Request::streambuf) for async_read_until()
//shared_ptr is used to pass temporary objects to the asynchronous functions
std::shared_ptr<Request> request(new Request(*socket));
//Set timeout on the following boost::asio::async-read or write function
auto timer=this->get_timeout_timer(socket, config.timeout_request);
boost::asio::async_read_until(*socket, request->streambuf, "\r\n\r\n",
[this, socket, request, timer](const boost::system::error_code& ec, size_t bytes_transferred) {
if(timer)
timer->cancel();
if(!ec) {
//request->streambuf.size() is not necessarily the same as bytes_transferred, from Boost-docs:
//"After a successful async_read_until operation, the streambuf may contain additional data beyond the delimiter"
//The chosen solution is to extract lines from the stream directly when parsing the header. What is left of the
//streambuf (maybe some bytes of the content) is appended to in the async_read-function below (for retrieving content).
size_t num_additional_bytes=request->streambuf.size()-bytes_transferred;
if(!this->parse_request(request))
return;
//If content, read that as well
auto it=request->header.find("Content-Length");
if(it!=request->header.end()) {
unsigned long long content_length;
try {
content_length=stoull(it->second);
}
catch(const std::exception &e) {
if(on_error)
on_error(request, boost::system::error_code(boost::system::errc::protocol_error, boost::system::generic_category()));
return;
}
if(content_length>num_additional_bytes) {
//Set timeout on the following boost::asio::async-read or write function
auto timer=this->get_timeout_timer(socket, config.timeout_content);
boost::asio::async_read(*socket, request->streambuf,
boost::asio::transfer_exactly(content_length-num_additional_bytes),
[this, socket, request, timer]
(const boost::system::error_code& ec, size_t /*bytes_transferred*/) {
if(timer)
timer->cancel();
if(!ec)
this->find_resource(socket, request);
else if(on_error)
on_error(request, ec);
});
}
else
this->find_resource(socket, request);
}
else
this->find_resource(socket, request);
}
else if(on_error)
on_error(request, ec);
});
}
bool parse_request(const std::shared_ptr<Request> &request) const {
std::string line;
getline(request->content, line);
size_t method_end;
if((method_end=line.find(' '))!=std::string::npos) {
size_t path_end;
if((path_end=line.find(' ', method_end+1))!=std::string::npos) {
request->method=line.substr(0, method_end);
request->path=line.substr(method_end+1, path_end-method_end-1);
size_t protocol_end;
if((protocol_end=line.find('/', path_end+1))!=std::string::npos) {
if(line.compare(path_end+1, protocol_end-path_end-1, "HTTP")!=0)
return false;
request->http_version=line.substr(protocol_end+1, line.size()-protocol_end-2);
}
else
return false;
getline(request->content, line);
size_t param_end;
while((param_end=line.find(':'))!=std::string::npos) {
size_t value_start=param_end+1;
if((value_start)<line.size()) {
if(line[value_start]==' ')
value_start++;
if(value_start<line.size())
request->header.emplace(line.substr(0, param_end), line.substr(value_start, line.size()-value_start-1));
}
getline(request->content, line);
}
}
else
return false;
}
else
return false;
return true;
}
void find_resource(const std::shared_ptr<socket_type> &socket, const std::shared_ptr<Request> &request) {
//Upgrade connection
if(on_upgrade) {
auto it=request->header.find("Upgrade");
if(it!=request->header.end()) {
on_upgrade(socket, request);
return;
}
}
//Find path- and method-match, and call write_response
for(auto &regex_method: resource) {
auto it=regex_method.second.find(request->method);
if(it!=regex_method.second.end()) {
REGEX_NS::smatch sm_res;
if(REGEX_NS::regex_match(request->path, sm_res, regex_method.first)) {
request->path_match=std::move(sm_res);
write_response(socket, request, it->second);
return;
}
}
}
auto it=default_resource.find(request->method);
if(it!=default_resource.end()) {
write_response(socket, request, it->second);
}
}
void write_response(const std::shared_ptr<socket_type> &socket, const std::shared_ptr<Request> &request,
std::function<void(std::shared_ptr<typename ServerBase<socket_type>::Response>,
std::shared_ptr<typename ServerBase<socket_type>::Request>)>& resource_function) {
//Set timeout on the following boost::asio::async-read or write function
auto timer=this->get_timeout_timer(socket, config.timeout_content);
auto response=std::shared_ptr<Response>(new Response(socket), [this, request, timer](Response *response_ptr) {
auto response=std::shared_ptr<Response>(response_ptr);
this->send(response, [this, response, request, timer](const boost::system::error_code& ec) {
if(timer)
timer->cancel();
if(!ec) {
if (response->close_connection_after_response)
return;
auto range=request->header.equal_range("Connection");
for(auto it=range.first;it!=range.second;it++) {
if(boost::iequals(it->second, "close"))
return;
}
if(request->http_version >= "1.1")
this->read_request_and_content(response->socket);
}
else if(on_error)
on_error(request, ec);
});
});
try {
resource_function(response, request);
}
catch(const std::exception &e) {
if(on_error)
on_error(request, boost::system::error_code(boost::system::errc::operation_canceled, boost::system::generic_category()));
return;
}
}
};
template<class socket_type>
class Server : public ServerBase<socket_type> {};
typedef boost::asio::ip::tcp::socket HTTP;
template<>
class Server<HTTP> : public ServerBase<HTTP> {
public:
DEPRECATED Server(unsigned short port, size_t thread_pool_size=1, long timeout_request=5, long timeout_content=300) :
Server() {
config.port=port;
config.thread_pool_size=thread_pool_size;
config.timeout_request=timeout_request;
config.timeout_content=timeout_content;
}
Server() : ServerBase<HTTP>::ServerBase(9000) {}
protected:
void accept() {
//Create new socket for this connection
//Shared_ptr is used to pass temporary objects to the asynchronous functions
auto socket=std::make_shared<HTTP>(*io_service);
acceptor->async_accept(*socket, [this, socket](const boost::system::error_code& ec){
//Immediately start accepting a new connection (if io_service hasn't been stopped)
if (ec != boost::asio::error::operation_aborted)
accept();
if(!ec) {
boost::asio::ip::tcp::no_delay option(true);
socket->set_option(option);
this->read_request_and_content(socket);
}
else if(on_error)
on_error(std::shared_ptr<Request>(new Request(*socket)), ec);
});
}
};
}
#endif /* SERVER_HTTP_HPP */
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