nghttp2/src/shrpx_downstream.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_DOWNSTREAM_H
#define SHRPX_DOWNSTREAM_H
#include "shrpx.h"
#include <cinttypes>
#include <vector>
#include <string>
#include <memory>
#include <chrono>
#include <algorithm>
#include <ev.h>
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#include <nghttp2/nghttp2.h>
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#ifdef ENABLE_HTTP3
# include <nghttp3/nghttp3.h>
#endif // ENABLE_HTTP3
#include "llhttp.h"
#include "shrpx_io_control.h"
#include "shrpx_log_config.h"
#include "http2.h"
#include "memchunk.h"
#include "allocator.h"
using namespace nghttp2;
namespace shrpx {
class Upstream;
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class DownstreamConnection;
struct BlockedLink;
struct DownstreamAddrGroup;
struct DownstreamAddr;
class FieldStore {
public:
FieldStore(BlockAllocator &balloc, size_t headers_initial_capacity)
: content_length(-1),
balloc_(balloc),
buffer_size_(0),
header_key_prev_(false),
trailer_key_prev_(false) {
headers_.reserve(headers_initial_capacity);
}
const HeaderRefs &headers() const { return headers_; }
const HeaderRefs &trailers() const { return trailers_; }
HeaderRefs &headers() { return headers_; }
HeaderRefs &trailers() { return trailers_; }
const void add_extra_buffer_size(size_t n) { buffer_size_ += n; }
size_t buffer_size() const { return buffer_size_; }
size_t num_fields() const { return headers_.size() + trailers_.size(); }
// Returns pointer to the header field with the name |name|. If
// multiple header have |name| as name, return last occurrence from
// the beginning. If no such header is found, returns nullptr.
const HeaderRefs::value_type *header(int32_t token) const;
HeaderRefs::value_type *header(int32_t token);
// Returns pointer to the header field with the name |name|. If no
// such header is found, returns nullptr.
const HeaderRefs::value_type *header(const StringRef &name) const;
void add_header_token(const StringRef &name, const StringRef &value,
bool no_index, int32_t token);
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// Adds header field name |name|. First, the copy of header field
// name pointed by name.c_str() of length name.size() is made, and
// stored.
void alloc_add_header_name(const StringRef &name);
void append_last_header_key(const char *data, size_t len);
void append_last_header_value(const char *data, size_t len);
bool header_key_prev() const { return header_key_prev_; }
// Parses content-length, and records it in the field. If there are
// multiple Content-Length, returns -1.
int parse_content_length();
// Empties headers.
void clear_headers();
void add_trailer_token(const StringRef &name, const StringRef &value,
bool no_index, int32_t token);
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// Adds trailer field name |name|. First, the copy of trailer field
// name pointed by name.c_str() of length name.size() is made, and
// stored.
void alloc_add_trailer_name(const StringRef &name);
void append_last_trailer_key(const char *data, size_t len);
void append_last_trailer_value(const char *data, size_t len);
bool trailer_key_prev() const { return trailer_key_prev_; }
// erase_content_length_and_transfer_encoding erases content-length
// and transfer-encoding header fields.
void erase_content_length_and_transfer_encoding();
// content-length, -1 if it is unknown.
int64_t content_length;
private:
BlockAllocator &balloc_;
HeaderRefs headers_;
// trailer fields. For HTTP/1.1, trailer fields are only included
// with chunked encoding. For HTTP/2, there is no such limit.
HeaderRefs trailers_;
// Sum of the length of name and value in headers_ and trailers_.
// This could also be increased by add_extra_buffer_size() to take
// into account for request URI in case of HTTP/1.x request.
size_t buffer_size_;
bool header_key_prev_;
bool trailer_key_prev_;
};
// Protocols allowed in HTTP/2 :protocol header field.
enum class ConnectProto {
NONE,
WEBSOCKET,
};
struct Request {
Request(BlockAllocator &balloc)
: fs(balloc, 16),
recv_body_length(0),
unconsumed_body_length(0),
method(-1),
http_major(1),
http_minor(1),
connect_proto(ConnectProto::NONE),
upgrade_request(false),
http2_upgrade_seen(false),
connection_close(false),
http2_expect_body(false),
no_authority(false),
forwarded_once(false) {}
void consume(size_t len) {
assert(unconsumed_body_length >= len);
unconsumed_body_length -= len;
}
bool regular_connect_method() const {
return method == HTTP_CONNECT && connect_proto == ConnectProto::NONE;
}
bool extended_connect_method() const {
return connect_proto != ConnectProto::NONE;
}
FieldStore fs;
// Timestamp when all request header fields are received.
std::shared_ptr<Timestamp> tstamp;
// Request scheme. For HTTP/2, this is :scheme header field value.
// For HTTP/1.1, this is deduced from URI or connection.
StringRef scheme;
// Request authority. This is HTTP/2 :authority header field value
// or host header field value. We may deduce it from absolute-form
// HTTP/1 request. We also store authority-form HTTP/1 request.
// This could be empty if request comes from HTTP/1.0 without Host
// header field and origin-form.
StringRef authority;
// Request path, including query component. For HTTP/1.1, this is
// request-target. For HTTP/2, this is :path header field value.
// For CONNECT request, this is empty.
StringRef path;
// This is original authority which cannot be changed by per-pattern
// mruby script.
StringRef orig_authority;
// This is original path which cannot be changed by per-pattern
// mruby script.
StringRef orig_path;
// the length of request body received so far
int64_t recv_body_length;
// The number of bytes not consumed by the application yet.
size_t unconsumed_body_length;
int method;
// HTTP major and minor version
int http_major, http_minor;
// connect_proto specified in HTTP/2 :protocol pseudo header field
// which enables extended CONNECT method. This field is also set if
// WebSocket upgrade is requested in h1 frontend for convenience.
ConnectProto connect_proto;
// Returns true if the request is HTTP upgrade (HTTP Upgrade or
// CONNECT method). Upgrade to HTTP/2 is excluded. For HTTP/2
// Upgrade, check get_http2_upgrade_request().
bool upgrade_request;
// true if h2c is seen in Upgrade header field.
bool http2_upgrade_seen;
bool connection_close;
// true if this is HTTP/2, and request body is expected. Note that
// we don't take into account HTTP method here.
bool http2_expect_body;
// true if request does not have any information about authority.
// This happens when: For HTTP/2 request, :authority is missing.
// For HTTP/1 request, origin or asterisk form is used.
bool no_authority;
// true if backend selection is done for request once.
// orig_authority and orig_path have the authority and path which
// are used for the first backend selection.
bool forwarded_once;
};
struct Response {
Response(BlockAllocator &balloc)
: fs(balloc, 32),
recv_body_length(0),
unconsumed_body_length(0),
http_status(0),
http_major(1),
http_minor(1),
connection_close(false),
headers_only(false) {}
void consume(size_t len) {
assert(unconsumed_body_length >= len);
unconsumed_body_length -= len;
}
// returns true if a resource denoted by scheme, authority, and path
// has already been pushed.
bool is_resource_pushed(const StringRef &scheme, const StringRef &authority,
const StringRef &path) const {
if (!pushed_resources) {
return false;
}
return std::find(std::begin(*pushed_resources), std::end(*pushed_resources),
std::make_tuple(scheme, authority, path)) !=
std::end(*pushed_resources);
}
// remember that a resource denoted by scheme, authority, and path
// is pushed.
void resource_pushed(const StringRef &scheme, const StringRef &authority,
const StringRef &path) {
if (!pushed_resources) {
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pushed_resources = std::make_unique<
std::vector<std::tuple<StringRef, StringRef, StringRef>>>();
}
pushed_resources->emplace_back(scheme, authority, path);
}
FieldStore fs;
// array of the tuple of scheme, authority, and path of pushed
// resource. This is required because RFC 8297 says that server
// typically includes header fields appeared in non-final response
// header fields in final response header fields. Without checking
// that a particular resource has already been pushed, or not, we
// end up pushing the same resource at least twice. It is unknown
// that we should use more complex data structure (e.g., std::set)
// to find the resources faster.
std::unique_ptr<std::vector<std::tuple<StringRef, StringRef, StringRef>>>
pushed_resources;
// the length of response body received so far
int64_t recv_body_length;
// The number of bytes not consumed by the application yet. This is
// mainly for HTTP/2 backend.
size_t unconsumed_body_length;
// HTTP status code
unsigned int http_status;
int http_major, http_minor;
bool connection_close;
// true if response only consists of HEADERS, and it bears
// END_STREAM. This is used to tell Http2Upstream that it can send
// response with single HEADERS with END_STREAM flag only.
bool headers_only;
};
enum class DownstreamState {
INITIAL,
HEADER_COMPLETE,
MSG_COMPLETE,
STREAM_CLOSED,
CONNECT_FAIL,
MSG_RESET,
// header contains invalid header field. We can safely send error
// response (502) to a client.
MSG_BAD_HEADER,
// header fields in HTTP/1 request exceed the configuration limit.
// This state is only transitioned from INITIAL state, and solely
// used to signal 431 status code to the client.
HTTP1_REQUEST_HEADER_TOO_LARGE,
};
enum class DispatchState {
NONE,
PENDING,
BLOCKED,
ACTIVE,
FAILURE,
};
class Downstream {
public:
Downstream(Upstream *upstream, MemchunkPool *mcpool, int64_t stream_id);
~Downstream();
void reset_upstream(Upstream *upstream);
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Upstream *get_upstream() const;
void set_stream_id(int64_t stream_id);
int64_t get_stream_id() const;
void set_assoc_stream_id(int64_t stream_id);
int64_t get_assoc_stream_id() const;
void pause_read(IOCtrlReason reason);
int resume_read(IOCtrlReason reason, size_t consumed);
void force_resume_read();
// Set stream ID for downstream HTTP2 connection.
void set_downstream_stream_id(int64_t stream_id);
int64_t get_downstream_stream_id() const;
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int attach_downstream_connection(std::unique_ptr<DownstreamConnection> dconn);
void detach_downstream_connection();
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DownstreamConnection *get_downstream_connection();
// Returns dconn_ and nullifies dconn_.
std::unique_ptr<DownstreamConnection> pop_downstream_connection();
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// Returns true if output buffer is full. If underlying dconn_ is
// NULL, this function always returns false.
bool request_buf_full();
// Returns true if upgrade (HTTP Upgrade or CONNECT) is succeeded in
// h1 backend. This should not depend on inspect_http1_response().
void check_upgrade_fulfilled_http1();
// Returns true if upgrade (HTTP Upgrade or CONNECT) is succeeded in
// h2 backend.
void check_upgrade_fulfilled_http2();
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// Returns true if the upgrade is succeeded as a result of the call
// check_upgrade_fulfilled_http*(). HTTP/2 Upgrade is excluded.
bool get_upgraded() const;
// Inspects HTTP/2 request.
void inspect_http2_request();
// Inspects HTTP/1 request. This checks whether the request is
// upgrade request and tranfer-encoding etc.
void inspect_http1_request();
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// Returns true if the request is HTTP Upgrade for HTTP/2
bool get_http2_upgrade_request() const;
// Returns the value of HTTP2-Settings request header field.
StringRef get_http2_settings() const;
// downstream request API
const Request &request() const { return req_; }
Request &request() { return req_; }
// Count number of crumbled cookies
size_t count_crumble_request_cookie();
// Crumbles (split cookie by ";") in request_headers_ and adds them
// in |nva|. Headers::no_index is inherited.
void crumble_request_cookie(std::vector<nghttp2_nv> &nva);
// Assembles request cookies. The opposite operation against
// crumble_request_cookie().
StringRef assemble_request_cookie();
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void
set_request_start_time(std::chrono::high_resolution_clock::time_point time);
const std::chrono::high_resolution_clock::time_point &
get_request_start_time() const;
int push_request_headers();
bool get_chunked_request() const;
void set_chunked_request(bool f);
int push_upload_data_chunk(const uint8_t *data, size_t datalen);
int end_upload_data();
// Validates that received request body length and content-length
// matches.
bool validate_request_recv_body_length() const;
void set_request_downstream_host(const StringRef &host);
bool expect_response_body() const;
bool expect_response_trailer() const;
void set_request_state(DownstreamState state);
DownstreamState get_request_state() const;
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DefaultMemchunks *get_request_buf();
void set_request_pending(bool f);
bool get_request_pending() const;
void set_request_header_sent(bool f);
bool get_request_header_sent() const;
// Returns true if request is ready to be submitted to downstream.
// When sending pending request, get_request_pending() should be
// checked too because this function may return true when
// get_request_pending() returns false.
bool request_submission_ready() const;
DefaultMemchunks *get_blocked_request_buf();
bool get_blocked_request_data_eof() const;
void set_blocked_request_data_eof(bool f);
// downstream response API
const Response &response() const { return resp_; }
Response &response() { return resp_; }
// Rewrites the location response header field.
void rewrite_location_response_header(const StringRef &upstream_scheme);
bool get_chunked_response() const;
void set_chunked_response(bool f);
void set_response_state(DownstreamState state);
DownstreamState get_response_state() const;
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DefaultMemchunks *get_response_buf();
bool response_buf_full();
// Validates that received response body length and content-length
// matches.
bool validate_response_recv_body_length() const;
uint32_t get_response_rst_stream_error_code() const;
void set_response_rst_stream_error_code(uint32_t error_code);
// Inspects HTTP/1 response. This checks tranfer-encoding etc.
void inspect_http1_response();
// Clears some of member variables for response.
void reset_response();
// True if the response is non-final (1xx status code). Note that
// if connection was upgraded, 101 status code is treated as final.
bool get_non_final_response() const;
// True if protocol version used by client supports non final
// response. Only HTTP/1.1 and HTTP/2 clients support it.
bool supports_non_final_response() const;
void set_expect_final_response(bool f);
bool get_expect_final_response() const;
// Call this method when there is incoming data in downstream
// connection.
int on_read();
// Resets upstream read timer. If it is active, timeout value is
// reset. If it is not active, timer will be started.
void reset_upstream_rtimer();
// Resets upstream write timer. If it is active, timeout value is
// reset. If it is not active, timer will be started. This
// function also resets read timer if it has been started.
void reset_upstream_wtimer();
// Makes sure that upstream write timer is started. If it has been
// started, do nothing. Otherwise, write timer will be started.
void ensure_upstream_wtimer();
// Disables upstream read timer.
void disable_upstream_rtimer();
// Disables upstream write timer.
void disable_upstream_wtimer();
// Downstream timer functions. They works in a similar way just
// like the upstream timer function.
void reset_downstream_rtimer();
void reset_downstream_wtimer();
void ensure_downstream_wtimer();
void disable_downstream_rtimer();
void disable_downstream_wtimer();
// Returns true if accesslog can be written for this downstream.
bool accesslog_ready() const;
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// Increment retry count
void add_retry();
// true if retry attempt should not be done.
bool no_more_retry() const;
DispatchState get_dispatch_state() const;
void set_dispatch_state(DispatchState s);
void attach_blocked_link(BlockedLink *l);
BlockedLink *detach_blocked_link();
// Returns true if downstream_connection can be detached and reused.
bool can_detach_downstream_connection() const;
DefaultMemchunks pop_response_buf();
BlockAllocator &get_block_allocator();
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void add_rcbuf(nghttp2_rcbuf *rcbuf);
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#ifdef ENABLE_HTTP3
void add_rcbuf(nghttp3_rcbuf *rcbuf);
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#endif // ENABLE_HTTP3
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void
set_downstream_addr_group(const std::shared_ptr<DownstreamAddrGroup> &group);
void set_addr(const DownstreamAddr *addr);
const DownstreamAddr *get_addr() const;
void set_accesslog_written(bool f);
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// Finds affinity cookie from request header fields. The name of
// cookie is given in |name|. If an affinity cookie is found, it is
// assigned to a member function, and is returned. If it is not
// found, or is malformed, returns 0.
uint32_t find_affinity_cookie(const StringRef &name);
// Set |h| as affinity cookie.
void renew_affinity_cookie(uint32_t h);
// Returns affinity cookie to send. If it does not need to be sent,
// for example, because the value is retrieved from a request header
// field, returns 0.
uint32_t get_affinity_cookie_to_send() const;
void set_ws_key(const StringRef &key);
bool get_expect_100_continue() const;
bool get_stop_reading() const;
void set_stop_reading(bool f);
enum {
EVENT_ERROR = 0x1,
EVENT_TIMEOUT = 0x2,
};
Downstream *dlnext, *dlprev;
// the length of response body sent to upstream client
int64_t response_sent_body_length;
private:
BlockAllocator balloc_;
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std::vector<nghttp2_rcbuf *> rcbufs_;
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#ifdef ENABLE_HTTP3
std::vector<nghttp3_rcbuf *> rcbufs3_;
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#endif // ENABLE_HTTP3
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Request req_;
Response resp_;
std::chrono::high_resolution_clock::time_point request_start_time_;
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// host we requested to downstream. This is used to rewrite
// location header field to decide the location should be rewritten
// or not.
StringRef request_downstream_host_;
// Data arrived in frontend before sending header fields to backend
// are stored in this buffer.
DefaultMemchunks blocked_request_buf_;
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DefaultMemchunks request_buf_;
DefaultMemchunks response_buf_;
// The Sec-WebSocket-Key field sent to the peer. This field is used
// if frontend uses RFC 8441 WebSocket bootstrapping via HTTP/2.
StringRef ws_key_;
ev_timer upstream_rtimer_;
ev_timer upstream_wtimer_;
ev_timer downstream_rtimer_;
ev_timer downstream_wtimer_;
Upstream *upstream_;
std::unique_ptr<DownstreamConnection> dconn_;
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// only used by HTTP/2 upstream
BlockedLink *blocked_link_;
// The backend address used to fulfill this request. These are for
// logging purpose.
std::shared_ptr<DownstreamAddrGroup> group_;
const DownstreamAddr *addr_;
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// How many times we tried in backend connection
size_t num_retry_;
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// The stream ID in frontend connection
int64_t stream_id_;
// The associated stream ID in frontend connection if this is pushed
// stream.
int64_t assoc_stream_id_;
// stream ID in backend connection
int64_t downstream_stream_id_;
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// RST_STREAM error_code from downstream HTTP2 connection
uint32_t response_rst_stream_error_code_;
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// An affinity cookie value.
uint32_t affinity_cookie_;
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// request state
DownstreamState request_state_;
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// response state
DownstreamState response_state_;
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// only used by HTTP/2 upstream
DispatchState dispatch_state_;
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// true if the connection is upgraded (HTTP Upgrade or CONNECT),
// excluding upgrade to HTTP/2.
bool upgraded_;
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// true if backend request uses chunked transfer-encoding
bool chunked_request_;
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// true if response to client uses chunked transfer-encoding
bool chunked_response_;
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// true if we have not got final response code
bool expect_final_response_;
// true if downstream request is pending because backend connection
// has not been established or should be checked before use;
// currently used only with HTTP/2 connection.
bool request_pending_;
// true if downstream request header is considered to be sent.
bool request_header_sent_;
// true if access.log has been written.
bool accesslog_written_;
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// true if affinity cookie is generated for this request.
bool new_affinity_cookie_;
// true if eof is received from client before sending header fields
// to backend.
bool blocked_request_data_eof_;
// true if request contains "expect: 100-continue" header field.
bool expect_100_continue_;
bool stop_reading_;
};
} // namespace shrpx
#endif // SHRPX_DOWNSTREAM_H