nghttp2/src/shrpx_connection_handler.h

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/*
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* nghttp2 - HTTP/2 C Library
*
* Copyright (c) 2012 Tatsuhiro Tsujikawa
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#ifndef SHRPX_CONNECTION_HANDLER_H
#define SHRPX_CONNECTION_HANDLER_H
#include "shrpx.h"
#include <sys/types.h>
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#ifdef HAVE_SYS_SOCKET_H
#include <sys/socket.h>
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#endif // HAVE_SYS_SOCKET_H
#include <mutex>
#include <memory>
#include <vector>
#include <random>
#ifndef NOTHREADS
#include <future>
#endif // NOTHREADS
#include <openssl/ssl.h>
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#include <ev.h>
#ifdef HAVE_NEVERBLEED
#include <neverbleed.h>
#endif // HAVE_NEVERBLEED
#include "shrpx_downstream_connection_pool.h"
#include "shrpx_config.h"
#include "shrpx_exec.h"
namespace shrpx {
class Http2Session;
class ConnectBlocker;
class AcceptHandler;
class Worker;
struct WorkerStat;
struct TicketKeys;
class MemcachedDispatcher;
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struct UpstreamAddr;
namespace ssl {
class CertLookupTree;
} // namespace ssl
struct OCSPUpdateContext {
// ocsp response buffer
std::vector<uint8_t> resp;
// Process running fetch-ocsp-response script
Process proc;
// index to ConnectionHandler::all_ssl_ctx_, which points to next
// SSL_CTX to update ocsp response cache.
size_t next;
ev_child chldev;
ev_io rev;
// errno encountered while processing response
int error;
};
// SerialEvent is an event sent from Worker thread.
enum SerialEventType {
SEV_NONE,
SEV_REPLACE_DOWNSTREAM,
};
struct SerialEvent {
// ctor for event uses DownstreamConfig
SerialEvent(int type, const std::shared_ptr<DownstreamConfig> &downstreamconf)
: type(type), downstreamconf(downstreamconf) {}
int type;
std::shared_ptr<DownstreamConfig> downstreamconf;
};
class ConnectionHandler {
public:
ConnectionHandler(struct ev_loop *loop, std::mt19937 &gen);
~ConnectionHandler();
int handle_connection(int fd, sockaddr *addr, int addrlen,
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const UpstreamAddr *faddr);
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// Creates Worker object for single threaded configuration.
int create_single_worker();
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// Creates |num| Worker objects for multi threaded configuration.
// The |num| must be strictly more than 1.
int create_worker_thread(size_t num);
void
set_ticket_keys_to_worker(const std::shared_ptr<TicketKeys> &ticket_keys);
void worker_reopen_log_files();
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void set_ticket_keys(std::shared_ptr<TicketKeys> ticket_keys);
const std::shared_ptr<TicketKeys> &get_ticket_keys() const;
struct ev_loop *get_loop() const;
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Worker *get_single_worker() const;
void add_acceptor(std::unique_ptr<AcceptHandler> h);
void enable_acceptor();
void disable_acceptor();
void sleep_acceptor(ev_tstamp t);
void accept_pending_connection();
void graceful_shutdown_worker();
void set_graceful_shutdown(bool f);
bool get_graceful_shutdown() const;
void join_worker();
// Cancels ocsp update process
void cancel_ocsp_update();
// Starts ocsp update for certficate |cert_file|.
int start_ocsp_update(const char *cert_file);
// Reads incoming data from ocsp update process
void read_ocsp_chunk();
// Handles the completion of one ocsp update
void handle_ocsp_complete();
// Resets ocsp_;
void reset_ocsp();
// Proceeds to the next certificate's ocsp update. If all
// certificates' ocsp update has been done, schedule next ocsp
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// update.
void proceed_next_cert_ocsp();
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void set_tls_ticket_key_memcached_dispatcher(
std::unique_ptr<MemcachedDispatcher> dispatcher);
MemcachedDispatcher *get_tls_ticket_key_memcached_dispatcher() const;
void on_tls_ticket_key_network_error(ev_timer *w);
void on_tls_ticket_key_not_found(ev_timer *w);
void
on_tls_ticket_key_get_success(const std::shared_ptr<TicketKeys> &ticket_keys,
ev_timer *w);
void schedule_next_tls_ticket_key_memcached_get(ev_timer *w);
SSL_CTX *create_tls_ticket_key_memcached_ssl_ctx();
// Returns the SSL_CTX at all_ssl_ctx_[idx]. This does not perform
// array bound checking.
SSL_CTX *get_ssl_ctx(size_t idx) const;
#ifdef HAVE_NEVERBLEED
void set_neverbleed(std::unique_ptr<neverbleed_t> nb);
neverbleed_t *get_neverbleed() const;
#endif // HAVE_NEVERBLEED
// Send SerialEvent SEV_REPLACE_DOWNSTREAM to this object.
void send_replace_downstream(
const std::shared_ptr<DownstreamConfig> &downstreamconf);
// Internal function to send |ev| to this object.
void send_serial_event(SerialEvent ev);
// Handles SerialEvents received.
void handle_serial_event();
// Sends WorkerEvent to make them replace downstream.
void
worker_replace_downstream(std::shared_ptr<DownstreamConfig> downstreamconf);
private:
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// Stores all SSL_CTX objects.
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std::vector<SSL_CTX *> all_ssl_ctx_;
OCSPUpdateContext ocsp_;
std::mt19937 gen_;
// ev_loop for each worker
std::vector<struct ev_loop *> worker_loops_;
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// Worker instances when multi threaded mode (-nN, N >= 2) is used.
// If at least one frontend enables API request, we allocate 1
// additional worker dedicated to API request .
std::vector<std::unique_ptr<Worker>> workers_;
// mutex for serial event resive buffer handling
std::mutex serial_event_mu_;
// SerialEvent receive buffer
std::vector<SerialEvent> serial_events_;
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// Worker instance used when single threaded mode (-n1) is used.
// Otherwise, nullptr and workers_ has instances of Worker instead.
std::unique_ptr<Worker> single_worker_;
std::unique_ptr<ssl::CertLookupTree> cert_tree_;
std::unique_ptr<MemcachedDispatcher> tls_ticket_key_memcached_dispatcher_;
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// Current TLS session ticket keys. Note that TLS connection does
// not refer to this field directly. They use TicketKeys object in
// Worker object.
std::shared_ptr<TicketKeys> ticket_keys_;
struct ev_loop *loop_;
std::vector<std::unique_ptr<AcceptHandler>> acceptors_;
#ifdef HAVE_NEVERBLEED
std::unique_ptr<neverbleed_t> nb_;
#endif // HAVE_NEVERBLEED
ev_timer disable_acceptor_timer_;
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ev_timer ocsp_timer_;
ev_async thread_join_asyncev_;
ev_async serial_event_asyncev_;
#ifndef NOTHREADS
std::future<void> thread_join_fut_;
#endif // NOTHREADS
size_t tls_ticket_key_memcached_get_retry_count_;
size_t tls_ticket_key_memcached_fail_count_;
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unsigned int worker_round_robin_cnt_;
bool graceful_shutdown_;
};
} // namespace shrpx
#endif // SHRPX_CONNECTION_HANDLER_H