nghttp2/src/shrpx_client_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_CLIENT_HANDLER_H
#define SHRPX_CLIENT_HANDLER_H
#include "shrpx.h"
#include <memory>
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#include <ev.h>
#include <openssl/ssl.h>
#include "shrpx_rate_limit.h"
#include "shrpx_connection.h"
#include "buffer.h"
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#include "memchunk.h"
#include "allocator.h"
using namespace nghttp2;
namespace shrpx {
class Upstream;
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class DownstreamConnection;
class HttpsUpstream;
class ConnectBlocker;
class DownstreamConnectionPool;
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class Worker;
class Downstream;
struct WorkerStat;
struct DownstreamAddrGroup;
struct DownstreamAddr;
class ClientHandler {
public:
ClientHandler(Worker *worker, int fd, SSL *ssl, const StringRef &ipaddr,
const StringRef &port, int family, const UpstreamAddr *faddr);
~ClientHandler();
int noop();
// Performs clear text I/O
int read_clear();
int write_clear();
// Performs TLS handshake
int tls_handshake();
// Performs TLS I/O
int read_tls();
int write_tls();
int upstream_noop();
int upstream_read();
int upstream_http2_connhd_read();
int upstream_http1_connhd_read();
int upstream_write();
int proxy_protocol_read();
int on_proxy_protocol_finish();
// Performs I/O operation. Internally calls on_read()/on_write().
int do_read();
int do_write();
// Processes buffers. No underlying I/O operation will be done.
int on_read();
int on_write();
struct ev_loop *get_loop() const;
void reset_upstream_read_timeout(ev_tstamp t);
void reset_upstream_write_timeout(ev_tstamp t);
int validate_next_proto();
const StringRef &get_ipaddr() const;
bool get_should_close_after_write() const;
void set_should_close_after_write(bool f);
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Upstream *get_upstream();
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void pool_downstream_connection(std::unique_ptr<DownstreamConnection> dconn);
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void remove_downstream_connection(DownstreamConnection *dconn);
// Returns DownstreamConnection object based on request path. This
// function returns non-null DownstreamConnection, and assigns 0 to
// |err| if it succeeds, or returns nullptr, and assigns negative
// error code to |err|.
std::unique_ptr<DownstreamConnection>
get_downstream_connection(int &err, Downstream *downstream);
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MemchunkPool *get_mcpool();
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SSL *get_ssl() const;
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// Call this function when HTTP/2 connection header is received at
// the start of the connection.
void direct_http2_upgrade();
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// Performs HTTP/2 Upgrade from the connection managed by
// |http|. If this function fails, the connection must be
// terminated. This function returns 0 if it succeeds, or -1.
int perform_http2_upgrade(HttpsUpstream *http);
bool get_http2_upgrade_allowed() const;
// Returns upstream scheme, either "http" or "https"
StringRef get_upstream_scheme() const;
void start_immediate_shutdown();
// Writes upstream accesslog using |downstream|. The |downstream|
// must not be nullptr.
void write_accesslog(Downstream *downstream);
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Worker *get_worker() const;
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// Initializes forwarded_for_.
void init_forwarded_for(int family, const StringRef &ipaddr);
using ReadBuf = DefaultMemchunkBuffer;
ReadBuf *get_rb();
RateLimit *get_rlimit();
RateLimit *get_wlimit();
void signal_write();
ev_io *get_wev();
void setup_upstream_io_callback();
// Returns string suitable for use in "by" parameter of Forwarded
// header field.
StringRef get_forwarded_by() const;
// Returns string suitable for use in "for" parameter of Forwarded
// header field.
StringRef get_forwarded_for() const;
Http2Session *
select_http2_session(const std::shared_ptr<DownstreamAddrGroup> &group);
Http2Session *select_http2_session_with_affinity(
const std::shared_ptr<DownstreamAddrGroup> &group, DownstreamAddr *addr);
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// Returns an affinity cookie value for |downstream|. |cookie_name|
// is used to inspect cookie header field in request header fields.
uint32_t get_affinity_cookie(Downstream *downstream,
const StringRef &cookie_name);
const UpstreamAddr *get_upstream_addr() const;
void repeat_read_timer();
void stop_read_timer();
Connection *get_connection();
// Stores |sni| which is TLS SNI extension value client sent in this
// connection.
void set_tls_sni(const StringRef &sni);
// Returns TLS SNI extension value client sent in this connection.
StringRef get_tls_sni() const;
// Returns ALPN negotiated in this connection.
StringRef get_alpn() const;
BlockAllocator &get_block_allocator();
private:
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// Allocator to allocate memory for connection-wide objects. Make
// sure that the allocations must be bounded, and not proportional
// to the number of requests.
BlockAllocator balloc_;
DefaultMemchunkBuffer rb_;
Connection conn_;
ev_timer reneg_shutdown_timer_;
std::unique_ptr<Upstream> upstream_;
// IP address of client. If UNIX domain socket is used, this is
// "localhost".
StringRef ipaddr_;
StringRef port_;
// The ALPN identifier negotiated for this connection.
StringRef alpn_;
// The client address used in "for" parameter of Forwarded header
// field.
StringRef forwarded_for_;
// lowercased TLS SNI which client sent.
StringRef sni_;
std::function<int(ClientHandler &)> read_, write_;
std::function<int(ClientHandler &)> on_read_, on_write_;
// Address of frontend listening socket
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const UpstreamAddr *faddr_;
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Worker *worker_;
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// The number of bytes of HTTP/2 client connection header to read
size_t left_connhd_len_;
// hash for session affinity using client IP
uint32_t affinity_hash_;
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bool should_close_after_write_;
// true if affinity_hash_ is computed
bool affinity_hash_computed_;
};
} // namespace shrpx
#endif // SHRPX_CLIENT_HANDLER_H