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Diffstat (limited to '')
| -rw-r--r-- | src/shrpx_downstream.cc | 1195 |
1 files changed, 1195 insertions, 0 deletions
diff --git a/src/shrpx_downstream.cc b/src/shrpx_downstream.cc new file mode 100644 index 0000000..245e00b --- /dev/null +++ b/src/shrpx_downstream.cc @@ -0,0 +1,1195 @@ +/* + * 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. + */ +#include "shrpx_downstream.h" + +#include <cassert> + +#include "url-parser/url_parser.h" + +#include "shrpx_upstream.h" +#include "shrpx_client_handler.h" +#include "shrpx_config.h" +#include "shrpx_error.h" +#include "shrpx_downstream_connection.h" +#include "shrpx_downstream_queue.h" +#include "shrpx_worker.h" +#include "shrpx_http2_session.h" +#include "shrpx_log.h" +#ifdef HAVE_MRUBY +# include "shrpx_mruby.h" +#endif // HAVE_MRUBY +#include "util.h" +#include "http2.h" + +namespace shrpx { + +namespace { +void upstream_timeoutcb(struct ev_loop *loop, ev_timer *w, int revents) { + auto downstream = static_cast<Downstream *>(w->data); + auto upstream = downstream->get_upstream(); + + auto which = revents == EV_READ ? "read" : "write"; + + if (LOG_ENABLED(INFO)) { + DLOG(INFO, downstream) << "upstream timeout stream_id=" + << downstream->get_stream_id() << " event=" << which; + } + + downstream->disable_upstream_rtimer(); + downstream->disable_upstream_wtimer(); + + upstream->on_timeout(downstream); +} +} // namespace + +namespace { +void upstream_rtimeoutcb(struct ev_loop *loop, ev_timer *w, int revents) { + upstream_timeoutcb(loop, w, EV_READ); +} +} // namespace + +namespace { +void upstream_wtimeoutcb(struct ev_loop *loop, ev_timer *w, int revents) { + upstream_timeoutcb(loop, w, EV_WRITE); +} +} // namespace + +namespace { +void downstream_timeoutcb(struct ev_loop *loop, ev_timer *w, int revents) { + auto downstream = static_cast<Downstream *>(w->data); + + auto which = revents == EV_READ ? "read" : "write"; + + if (LOG_ENABLED(INFO)) { + DLOG(INFO, downstream) << "downstream timeout stream_id=" + << downstream->get_downstream_stream_id() + << " event=" << which; + } + + downstream->disable_downstream_rtimer(); + downstream->disable_downstream_wtimer(); + + auto dconn = downstream->get_downstream_connection(); + + if (dconn) { + dconn->on_timeout(); + } +} +} // namespace + +namespace { +void downstream_rtimeoutcb(struct ev_loop *loop, ev_timer *w, int revents) { + downstream_timeoutcb(loop, w, EV_READ); +} +} // namespace + +namespace { +void downstream_wtimeoutcb(struct ev_loop *loop, ev_timer *w, int revents) { + downstream_timeoutcb(loop, w, EV_WRITE); +} +} // namespace + +// upstream could be nullptr for unittests +Downstream::Downstream(Upstream *upstream, MemchunkPool *mcpool, + int64_t stream_id) + : dlnext(nullptr), + dlprev(nullptr), + response_sent_body_length(0), + balloc_(1024, 1024), + req_(balloc_), + resp_(balloc_), + request_start_time_(std::chrono::high_resolution_clock::now()), + blocked_request_buf_(mcpool), + request_buf_(mcpool), + response_buf_(mcpool), + upstream_(upstream), + blocked_link_(nullptr), + addr_(nullptr), + num_retry_(0), + stream_id_(stream_id), + assoc_stream_id_(-1), + downstream_stream_id_(-1), + response_rst_stream_error_code_(NGHTTP2_NO_ERROR), + affinity_cookie_(0), + request_state_(DownstreamState::INITIAL), + response_state_(DownstreamState::INITIAL), + dispatch_state_(DispatchState::NONE), + upgraded_(false), + chunked_request_(false), + chunked_response_(false), + expect_final_response_(false), + request_pending_(false), + request_header_sent_(false), + accesslog_written_(false), + new_affinity_cookie_(false), + blocked_request_data_eof_(false), + expect_100_continue_(false), + stop_reading_(false) { + + auto &timeoutconf = get_config()->http2.timeout; + + ev_timer_init(&upstream_rtimer_, &upstream_rtimeoutcb, 0., + timeoutconf.stream_read); + ev_timer_init(&upstream_wtimer_, &upstream_wtimeoutcb, 0., + timeoutconf.stream_write); + ev_timer_init(&downstream_rtimer_, &downstream_rtimeoutcb, 0., + timeoutconf.stream_read); + ev_timer_init(&downstream_wtimer_, &downstream_wtimeoutcb, 0., + timeoutconf.stream_write); + + upstream_rtimer_.data = this; + upstream_wtimer_.data = this; + downstream_rtimer_.data = this; + downstream_wtimer_.data = this; + + rcbufs_.reserve(32); +#ifdef ENABLE_HTTP3 + rcbufs3_.reserve(32); +#endif // ENABLE_HTTP3 +} + +Downstream::~Downstream() { + if (LOG_ENABLED(INFO)) { + DLOG(INFO, this) << "Deleting"; + } + + // check nullptr for unittest + if (upstream_) { + auto loop = upstream_->get_client_handler()->get_loop(); + + ev_timer_stop(loop, &upstream_rtimer_); + ev_timer_stop(loop, &upstream_wtimer_); + ev_timer_stop(loop, &downstream_rtimer_); + ev_timer_stop(loop, &downstream_wtimer_); + +#ifdef HAVE_MRUBY + auto handler = upstream_->get_client_handler(); + auto worker = handler->get_worker(); + auto mruby_ctx = worker->get_mruby_context(); + + mruby_ctx->delete_downstream(this); +#endif // HAVE_MRUBY + } + +#ifdef HAVE_MRUBY + if (dconn_) { + const auto &group = dconn_->get_downstream_addr_group(); + if (group) { + const auto &mruby_ctx = group->shared_addr->mruby_ctx; + mruby_ctx->delete_downstream(this); + } + } +#endif // HAVE_MRUBY + + // DownstreamConnection may refer to this object. Delete it now + // explicitly. + dconn_.reset(); + +#ifdef ENABLE_HTTP3 + for (auto rcbuf : rcbufs3_) { + nghttp3_rcbuf_decref(rcbuf); + } +#endif // ENABLE_HTTP3 + + for (auto rcbuf : rcbufs_) { + nghttp2_rcbuf_decref(rcbuf); + } + + if (LOG_ENABLED(INFO)) { + DLOG(INFO, this) << "Deleted"; + } +} + +int Downstream::attach_downstream_connection( + std::unique_ptr<DownstreamConnection> dconn) { + if (dconn->attach_downstream(this) != 0) { + return -1; + } + + dconn_ = std::move(dconn); + + return 0; +} + +void Downstream::detach_downstream_connection() { + if (!dconn_) { + return; + } + +#ifdef HAVE_MRUBY + const auto &group = dconn_->get_downstream_addr_group(); + if (group) { + const auto &mruby_ctx = group->shared_addr->mruby_ctx; + mruby_ctx->delete_downstream(this); + } +#endif // HAVE_MRUBY + + dconn_->detach_downstream(this); + + auto handler = dconn_->get_client_handler(); + + handler->pool_downstream_connection( + std::unique_ptr<DownstreamConnection>(dconn_.release())); +} + +DownstreamConnection *Downstream::get_downstream_connection() { + return dconn_.get(); +} + +std::unique_ptr<DownstreamConnection> Downstream::pop_downstream_connection() { +#ifdef HAVE_MRUBY + if (!dconn_) { + return nullptr; + } + + const auto &group = dconn_->get_downstream_addr_group(); + if (group) { + const auto &mruby_ctx = group->shared_addr->mruby_ctx; + mruby_ctx->delete_downstream(this); + } +#endif // HAVE_MRUBY + + return std::unique_ptr<DownstreamConnection>(dconn_.release()); +} + +void Downstream::pause_read(IOCtrlReason reason) { + if (dconn_) { + dconn_->pause_read(reason); + } +} + +int Downstream::resume_read(IOCtrlReason reason, size_t consumed) { + if (dconn_) { + return dconn_->resume_read(reason, consumed); + } + + return 0; +} + +void Downstream::force_resume_read() { + if (dconn_) { + dconn_->force_resume_read(); + } +} + +namespace { +const HeaderRefs::value_type * +search_header_linear_backwards(const HeaderRefs &headers, + const StringRef &name) { + for (auto it = headers.rbegin(); it != headers.rend(); ++it) { + auto &kv = *it; + if (kv.name == name) { + return &kv; + } + } + return nullptr; +} +} // namespace + +StringRef Downstream::assemble_request_cookie() { + size_t len = 0; + + for (auto &kv : req_.fs.headers()) { + if (kv.token != http2::HD_COOKIE || kv.value.empty()) { + continue; + } + + len += kv.value.size() + str_size("; "); + } + + auto iov = make_byte_ref(balloc_, len + 1); + auto p = iov.base; + + for (auto &kv : req_.fs.headers()) { + if (kv.token != http2::HD_COOKIE || kv.value.empty()) { + continue; + } + + auto end = std::end(kv.value); + for (auto it = std::begin(kv.value) + kv.value.size(); + it != std::begin(kv.value); --it) { + auto c = *(it - 1); + if (c == ' ' || c == ';') { + continue; + } + end = it; + break; + } + + p = std::copy(std::begin(kv.value), end, p); + p = util::copy_lit(p, "; "); + } + + // cut trailing "; " + if (p - iov.base >= 2) { + p -= 2; + } + + return StringRef{iov.base, p}; +} + +uint32_t Downstream::find_affinity_cookie(const StringRef &name) { + for (auto &kv : req_.fs.headers()) { + if (kv.token != http2::HD_COOKIE) { + continue; + } + + for (auto it = std::begin(kv.value); it != std::end(kv.value);) { + if (*it == '\t' || *it == ' ' || *it == ';') { + ++it; + continue; + } + + auto end = std::find(it, std::end(kv.value), '='); + if (end == std::end(kv.value)) { + return 0; + } + + if (!util::streq(name, StringRef{it, end})) { + it = std::find(it, std::end(kv.value), ';'); + continue; + } + + it = std::find(end + 1, std::end(kv.value), ';'); + auto val = StringRef{end + 1, it}; + if (val.size() != 8) { + return 0; + } + uint32_t h = 0; + for (auto c : val) { + auto n = util::hex_to_uint(c); + if (n == 256) { + return 0; + } + h <<= 4; + h += n; + } + affinity_cookie_ = h; + return h; + } + } + return 0; +} + +size_t Downstream::count_crumble_request_cookie() { + size_t n = 0; + for (auto &kv : req_.fs.headers()) { + if (kv.token != http2::HD_COOKIE) { + continue; + } + + for (auto it = std::begin(kv.value); it != std::end(kv.value);) { + if (*it == '\t' || *it == ' ' || *it == ';') { + ++it; + continue; + } + + it = std::find(it, std::end(kv.value), ';'); + + ++n; + } + } + return n; +} + +void Downstream::crumble_request_cookie(std::vector<nghttp2_nv> &nva) { + for (auto &kv : req_.fs.headers()) { + if (kv.token != http2::HD_COOKIE) { + continue; + } + + for (auto it = std::begin(kv.value); it != std::end(kv.value);) { + if (*it == '\t' || *it == ' ' || *it == ';') { + ++it; + continue; + } + + auto first = it; + + it = std::find(it, std::end(kv.value), ';'); + + nva.push_back({(uint8_t *)"cookie", (uint8_t *)first, str_size("cookie"), + (size_t)(it - first), + (uint8_t)(NGHTTP2_NV_FLAG_NO_COPY_NAME | + NGHTTP2_NV_FLAG_NO_COPY_VALUE | + (kv.no_index ? NGHTTP2_NV_FLAG_NO_INDEX : 0))}); + } + } +} + +namespace { +void add_header(size_t &sum, HeaderRefs &headers, const StringRef &name, + const StringRef &value, bool no_index, int32_t token) { + sum += name.size() + value.size(); + headers.emplace_back(name, value, no_index, token); +} +} // namespace + +namespace { +StringRef alloc_header_name(BlockAllocator &balloc, const StringRef &name) { + auto iov = make_byte_ref(balloc, name.size() + 1); + auto p = iov.base; + p = std::copy(std::begin(name), std::end(name), p); + util::inp_strlower(iov.base, p); + *p = '\0'; + + return StringRef{iov.base, p}; +} +} // namespace + +namespace { +void append_last_header_key(BlockAllocator &balloc, bool &key_prev, size_t &sum, + HeaderRefs &headers, const char *data, size_t len) { + assert(key_prev); + sum += len; + auto &item = headers.back(); + auto name = + realloc_concat_string_ref(balloc, item.name, StringRef{data, len}); + + auto p = const_cast<uint8_t *>(name.byte()); + util::inp_strlower(p + name.size() - len, p + name.size()); + + item.name = name; + item.token = http2::lookup_token(item.name); +} +} // namespace + +namespace { +void append_last_header_value(BlockAllocator &balloc, bool &key_prev, + size_t &sum, HeaderRefs &headers, + const char *data, size_t len) { + key_prev = false; + sum += len; + auto &item = headers.back(); + item.value = + realloc_concat_string_ref(balloc, item.value, StringRef{data, len}); +} +} // namespace + +int FieldStore::parse_content_length() { + content_length = -1; + + for (auto &kv : headers_) { + if (kv.token != http2::HD_CONTENT_LENGTH) { + continue; + } + + auto len = util::parse_uint(kv.value); + if (len == -1) { + return -1; + } + if (content_length != -1) { + return -1; + } + content_length = len; + } + return 0; +} + +const HeaderRefs::value_type *FieldStore::header(int32_t token) const { + for (auto it = headers_.rbegin(); it != headers_.rend(); ++it) { + auto &kv = *it; + if (kv.token == token) { + return &kv; + } + } + return nullptr; +} + +HeaderRefs::value_type *FieldStore::header(int32_t token) { + for (auto it = headers_.rbegin(); it != headers_.rend(); ++it) { + auto &kv = *it; + if (kv.token == token) { + return &kv; + } + } + return nullptr; +} + +const HeaderRefs::value_type *FieldStore::header(const StringRef &name) const { + return search_header_linear_backwards(headers_, name); +} + +void FieldStore::add_header_token(const StringRef &name, const StringRef &value, + bool no_index, int32_t token) { + shrpx::add_header(buffer_size_, headers_, name, value, no_index, token); +} + +void FieldStore::alloc_add_header_name(const StringRef &name) { + auto name_ref = alloc_header_name(balloc_, name); + auto token = http2::lookup_token(name_ref); + add_header_token(name_ref, StringRef{}, false, token); + header_key_prev_ = true; +} + +void FieldStore::append_last_header_key(const char *data, size_t len) { + shrpx::append_last_header_key(balloc_, header_key_prev_, buffer_size_, + headers_, data, len); +} + +void FieldStore::append_last_header_value(const char *data, size_t len) { + shrpx::append_last_header_value(balloc_, header_key_prev_, buffer_size_, + headers_, data, len); +} + +void FieldStore::clear_headers() { + headers_.clear(); + header_key_prev_ = false; +} + +void FieldStore::add_trailer_token(const StringRef &name, + const StringRef &value, bool no_index, + int32_t token) { + // Header size limit should be applied to all header and trailer + // fields combined. + shrpx::add_header(buffer_size_, trailers_, name, value, no_index, token); +} + +void FieldStore::alloc_add_trailer_name(const StringRef &name) { + auto name_ref = alloc_header_name(balloc_, name); + auto token = http2::lookup_token(name_ref); + add_trailer_token(name_ref, StringRef{}, false, token); + trailer_key_prev_ = true; +} + +void FieldStore::append_last_trailer_key(const char *data, size_t len) { + shrpx::append_last_header_key(balloc_, trailer_key_prev_, buffer_size_, + trailers_, data, len); +} + +void FieldStore::append_last_trailer_value(const char *data, size_t len) { + shrpx::append_last_header_value(balloc_, trailer_key_prev_, buffer_size_, + trailers_, data, len); +} + +void FieldStore::erase_content_length_and_transfer_encoding() { + for (auto &kv : headers_) { + switch (kv.token) { + case http2::HD_CONTENT_LENGTH: + case http2::HD_TRANSFER_ENCODING: + kv.name = StringRef{}; + kv.token = -1; + break; + } + } +} + +void Downstream::set_request_start_time( + std::chrono::high_resolution_clock::time_point time) { + request_start_time_ = std::move(time); +} + +const std::chrono::high_resolution_clock::time_point & +Downstream::get_request_start_time() const { + return request_start_time_; +} + +void Downstream::reset_upstream(Upstream *upstream) { + upstream_ = upstream; + if (dconn_) { + dconn_->on_upstream_change(upstream); + } +} + +Upstream *Downstream::get_upstream() const { return upstream_; } + +void Downstream::set_stream_id(int64_t stream_id) { stream_id_ = stream_id; } + +int64_t Downstream::get_stream_id() const { return stream_id_; } + +void Downstream::set_request_state(DownstreamState state) { + request_state_ = state; +} + +DownstreamState Downstream::get_request_state() const { return request_state_; } + +bool Downstream::get_chunked_request() const { return chunked_request_; } + +void Downstream::set_chunked_request(bool f) { chunked_request_ = f; } + +bool Downstream::request_buf_full() { + auto handler = upstream_->get_client_handler(); + auto faddr = handler->get_upstream_addr(); + auto worker = handler->get_worker(); + + // We don't check buffer size here for API endpoint. + if (faddr->alt_mode == UpstreamAltMode::API) { + return false; + } + + if (dconn_) { + auto &downstreamconf = *worker->get_downstream_config(); + return blocked_request_buf_.rleft() + request_buf_.rleft() >= + downstreamconf.request_buffer_size; + } + + return false; +} + +DefaultMemchunks *Downstream::get_request_buf() { return &request_buf_; } + +// Call this function after this object is attached to +// Downstream. Otherwise, the program will crash. +int Downstream::push_request_headers() { + if (!dconn_) { + DLOG(INFO, this) << "dconn_ is NULL"; + return -1; + } + return dconn_->push_request_headers(); +} + +int Downstream::push_upload_data_chunk(const uint8_t *data, size_t datalen) { + req_.recv_body_length += datalen; + + if (!dconn_ && !request_header_sent_) { + blocked_request_buf_.append(data, datalen); + req_.unconsumed_body_length += datalen; + return 0; + } + + // Assumes that request headers have already been pushed to output + // buffer using push_request_headers(). + if (!dconn_) { + DLOG(INFO, this) << "dconn_ is NULL"; + return -1; + } + if (dconn_->push_upload_data_chunk(data, datalen) != 0) { + return -1; + } + + req_.unconsumed_body_length += datalen; + + return 0; +} + +int Downstream::end_upload_data() { + if (!dconn_ && !request_header_sent_) { + blocked_request_data_eof_ = true; + return 0; + } + if (!dconn_) { + DLOG(INFO, this) << "dconn_ is NULL"; + return -1; + } + return dconn_->end_upload_data(); +} + +void Downstream::rewrite_location_response_header( + const StringRef &upstream_scheme) { + auto hd = resp_.fs.header(http2::HD_LOCATION); + if (!hd) { + return; + } + + if (request_downstream_host_.empty() || req_.authority.empty()) { + return; + } + + http_parser_url u{}; + auto rv = http_parser_parse_url(hd->value.c_str(), hd->value.size(), 0, &u); + if (rv != 0) { + return; + } + + auto new_uri = http2::rewrite_location_uri(balloc_, hd->value, u, + request_downstream_host_, + req_.authority, upstream_scheme); + + if (new_uri.empty()) { + return; + } + + hd->value = new_uri; +} + +bool Downstream::get_chunked_response() const { return chunked_response_; } + +void Downstream::set_chunked_response(bool f) { chunked_response_ = f; } + +int Downstream::on_read() { + if (!dconn_) { + DLOG(INFO, this) << "dconn_ is NULL"; + return -1; + } + return dconn_->on_read(); +} + +void Downstream::set_response_state(DownstreamState state) { + response_state_ = state; +} + +DownstreamState Downstream::get_response_state() const { + return response_state_; +} + +DefaultMemchunks *Downstream::get_response_buf() { return &response_buf_; } + +bool Downstream::response_buf_full() { + if (dconn_) { + auto handler = upstream_->get_client_handler(); + auto worker = handler->get_worker(); + auto &downstreamconf = *worker->get_downstream_config(); + + return response_buf_.rleft() >= downstreamconf.response_buffer_size; + } + + return false; +} + +bool Downstream::validate_request_recv_body_length() const { + if (req_.fs.content_length == -1) { + return true; + } + + if (req_.fs.content_length != req_.recv_body_length) { + if (LOG_ENABLED(INFO)) { + DLOG(INFO, this) << "request invalid bodylen: content-length=" + << req_.fs.content_length + << ", received=" << req_.recv_body_length; + } + return false; + } + + return true; +} + +bool Downstream::validate_response_recv_body_length() const { + if (!expect_response_body() || resp_.fs.content_length == -1) { + return true; + } + + if (resp_.fs.content_length != resp_.recv_body_length) { + if (LOG_ENABLED(INFO)) { + DLOG(INFO, this) << "response invalid bodylen: content-length=" + << resp_.fs.content_length + << ", received=" << resp_.recv_body_length; + } + return false; + } + + return true; +} + +void Downstream::check_upgrade_fulfilled_http2() { + // This handles nonzero req_.connect_proto and h1 frontend requests + // WebSocket upgrade. + upgraded_ = (req_.method == HTTP_CONNECT || + req_.connect_proto == ConnectProto::WEBSOCKET) && + resp_.http_status / 100 == 2; +} + +void Downstream::check_upgrade_fulfilled_http1() { + if (req_.method == HTTP_CONNECT) { + if (req_.connect_proto == ConnectProto::WEBSOCKET) { + if (resp_.http_status != 101) { + return; + } + + // This is done for HTTP/2 frontend only. + auto accept = resp_.fs.header(http2::HD_SEC_WEBSOCKET_ACCEPT); + if (!accept) { + return; + } + + std::array<uint8_t, base64::encode_length(20)> accept_buf; + auto expected = + http2::make_websocket_accept_token(accept_buf.data(), ws_key_); + + upgraded_ = expected != "" && expected == accept->value; + } else { + upgraded_ = resp_.http_status / 100 == 2; + } + + return; + } + + if (resp_.http_status == 101) { + // TODO Do more strict checking for upgrade headers + upgraded_ = req_.upgrade_request; + + return; + } +} + +void Downstream::inspect_http2_request() { + if (req_.method == HTTP_CONNECT) { + req_.upgrade_request = true; + } +} + +void Downstream::inspect_http1_request() { + if (req_.method == HTTP_CONNECT) { + req_.upgrade_request = true; + } else if (req_.http_minor > 0) { + auto upgrade = req_.fs.header(http2::HD_UPGRADE); + if (upgrade) { + const auto &val = upgrade->value; + // TODO Perform more strict checking for upgrade headers + if (util::streq_l(NGHTTP2_CLEARTEXT_PROTO_VERSION_ID, val.c_str(), + val.size())) { + req_.http2_upgrade_seen = true; + } else { + req_.upgrade_request = true; + + // TODO Should we check Sec-WebSocket-Key, and + // Sec-WebSocket-Version as well? + if (util::strieq_l("websocket", val)) { + req_.connect_proto = ConnectProto::WEBSOCKET; + } + } + } + } + auto transfer_encoding = req_.fs.header(http2::HD_TRANSFER_ENCODING); + if (transfer_encoding) { + req_.fs.content_length = -1; + if (util::iends_with_l(transfer_encoding->value, "chunked")) { + chunked_request_ = true; + } + } + + auto expect = req_.fs.header(http2::HD_EXPECT); + expect_100_continue_ = + expect && + util::strieq(expect->value, StringRef::from_lit("100-continue")); +} + +void Downstream::inspect_http1_response() { + auto transfer_encoding = resp_.fs.header(http2::HD_TRANSFER_ENCODING); + if (transfer_encoding) { + resp_.fs.content_length = -1; + if (util::iends_with_l(transfer_encoding->value, "chunked")) { + chunked_response_ = true; + } + } +} + +void Downstream::reset_response() { + resp_.http_status = 0; + resp_.http_major = 1; + resp_.http_minor = 1; +} + +bool Downstream::get_non_final_response() const { + return !upgraded_ && resp_.http_status / 100 == 1; +} + +bool Downstream::supports_non_final_response() const { + return req_.http_major == 3 || req_.http_major == 2 || + (req_.http_major == 1 && req_.http_minor == 1); +} + +bool Downstream::get_upgraded() const { return upgraded_; } + +bool Downstream::get_http2_upgrade_request() const { + return req_.http2_upgrade_seen && req_.fs.header(http2::HD_HTTP2_SETTINGS) && + response_state_ == DownstreamState::INITIAL; +} + +StringRef Downstream::get_http2_settings() const { + auto http2_settings = req_.fs.header(http2::HD_HTTP2_SETTINGS); + if (!http2_settings) { + return StringRef{}; + } + return http2_settings->value; +} + +void Downstream::set_downstream_stream_id(int64_t stream_id) { + downstream_stream_id_ = stream_id; +} + +int64_t Downstream::get_downstream_stream_id() const { + return downstream_stream_id_; +} + +uint32_t Downstream::get_response_rst_stream_error_code() const { + return response_rst_stream_error_code_; +} + +void Downstream::set_response_rst_stream_error_code(uint32_t error_code) { + response_rst_stream_error_code_ = error_code; +} + +void Downstream::set_expect_final_response(bool f) { + expect_final_response_ = f; +} + +bool Downstream::get_expect_final_response() const { + return expect_final_response_; +} + +bool Downstream::expect_response_body() const { + return !resp_.headers_only && + http2::expect_response_body(req_.method, resp_.http_status); +} + +bool Downstream::expect_response_trailer() const { + // In HTTP/2, if final response HEADERS does not bear END_STREAM it + // is possible trailer fields might come, regardless of request + // method or status code. + return !resp_.headers_only && + (resp_.http_major == 3 || resp_.http_major == 2); +} + +namespace { +void reset_timer(struct ev_loop *loop, ev_timer *w) { ev_timer_again(loop, w); } +} // namespace + +namespace { +void try_reset_timer(struct ev_loop *loop, ev_timer *w) { + if (!ev_is_active(w)) { + return; + } + ev_timer_again(loop, w); +} +} // namespace + +namespace { +void ensure_timer(struct ev_loop *loop, ev_timer *w) { + if (ev_is_active(w)) { + return; + } + ev_timer_again(loop, w); +} +} // namespace + +namespace { +void disable_timer(struct ev_loop *loop, ev_timer *w) { + ev_timer_stop(loop, w); +} +} // namespace + +void Downstream::reset_upstream_rtimer() { + if (get_config()->http2.timeout.stream_read == 0.) { + return; + } + auto loop = upstream_->get_client_handler()->get_loop(); + reset_timer(loop, &upstream_rtimer_); +} + +void Downstream::reset_upstream_wtimer() { + auto loop = upstream_->get_client_handler()->get_loop(); + auto &timeoutconf = get_config()->http2.timeout; + + if (timeoutconf.stream_write != 0.) { + reset_timer(loop, &upstream_wtimer_); + } + if (timeoutconf.stream_read != 0.) { + try_reset_timer(loop, &upstream_rtimer_); + } +} + +void Downstream::ensure_upstream_wtimer() { + if (get_config()->http2.timeout.stream_write == 0.) { + return; + } + auto loop = upstream_->get_client_handler()->get_loop(); + ensure_timer(loop, &upstream_wtimer_); +} + +void Downstream::disable_upstream_rtimer() { + if (get_config()->http2.timeout.stream_read == 0.) { + return; + } + auto loop = upstream_->get_client_handler()->get_loop(); + disable_timer(loop, &upstream_rtimer_); +} + +void Downstream::disable_upstream_wtimer() { + if (get_config()->http2.timeout.stream_write == 0.) { + return; + } + auto loop = upstream_->get_client_handler()->get_loop(); + disable_timer(loop, &upstream_wtimer_); +} + +void Downstream::reset_downstream_rtimer() { + if (get_config()->http2.timeout.stream_read == 0.) { + return; + } + auto loop = upstream_->get_client_handler()->get_loop(); + reset_timer(loop, &downstream_rtimer_); +} + +void Downstream::reset_downstream_wtimer() { + auto loop = upstream_->get_client_handler()->get_loop(); + auto &timeoutconf = get_config()->http2.timeout; + + if (timeoutconf.stream_write != 0.) { + reset_timer(loop, &downstream_wtimer_); + } + if (timeoutconf.stream_read != 0.) { + try_reset_timer(loop, &downstream_rtimer_); + } +} + +void Downstream::ensure_downstream_wtimer() { + if (get_config()->http2.timeout.stream_write == 0.) { + return; + } + auto loop = upstream_->get_client_handler()->get_loop(); + ensure_timer(loop, &downstream_wtimer_); +} + +void Downstream::disable_downstream_rtimer() { + if (get_config()->http2.timeout.stream_read == 0.) { + return; + } + auto loop = upstream_->get_client_handler()->get_loop(); + disable_timer(loop, &downstream_rtimer_); +} + +void Downstream::disable_downstream_wtimer() { + if (get_config()->http2.timeout.stream_write == 0.) { + return; + } + auto loop = upstream_->get_client_handler()->get_loop(); + disable_timer(loop, &downstream_wtimer_); +} + +bool Downstream::accesslog_ready() const { + return !accesslog_written_ && resp_.http_status > 0; +} + +void Downstream::add_retry() { ++num_retry_; } + +bool Downstream::no_more_retry() const { return num_retry_ > 50; } + +void Downstream::set_request_downstream_host(const StringRef &host) { + request_downstream_host_ = host; +} + +void Downstream::set_request_pending(bool f) { request_pending_ = f; } + +bool Downstream::get_request_pending() const { return request_pending_; } + +void Downstream::set_request_header_sent(bool f) { request_header_sent_ = f; } + +bool Downstream::get_request_header_sent() const { + return request_header_sent_; +} + +bool Downstream::request_submission_ready() const { + return (request_state_ == DownstreamState::HEADER_COMPLETE || + request_state_ == DownstreamState::MSG_COMPLETE) && + (request_pending_ || !request_header_sent_) && + response_state_ == DownstreamState::INITIAL; +} + +DispatchState Downstream::get_dispatch_state() const { return dispatch_state_; } + +void Downstream::set_dispatch_state(DispatchState s) { dispatch_state_ = s; } + +void Downstream::attach_blocked_link(BlockedLink *l) { + assert(!blocked_link_); + + l->downstream = this; + blocked_link_ = l; +} + +BlockedLink *Downstream::detach_blocked_link() { + auto link = blocked_link_; + blocked_link_ = nullptr; + return link; +} + +bool Downstream::can_detach_downstream_connection() const { + // We should check request and response buffer. If request buffer + // is not empty, then we might leave downstream connection in weird + // state, especially for HTTP/1.1 + return dconn_ && response_state_ == DownstreamState::MSG_COMPLETE && + request_state_ == DownstreamState::MSG_COMPLETE && !upgraded_ && + !resp_.connection_close && request_buf_.rleft() == 0; +} + +DefaultMemchunks Downstream::pop_response_buf() { + return std::move(response_buf_); +} + +void Downstream::set_assoc_stream_id(int64_t stream_id) { + assoc_stream_id_ = stream_id; +} + +int64_t Downstream::get_assoc_stream_id() const { return assoc_stream_id_; } + +BlockAllocator &Downstream::get_block_allocator() { return balloc_; } + +void Downstream::add_rcbuf(nghttp2_rcbuf *rcbuf) { + nghttp2_rcbuf_incref(rcbuf); + rcbufs_.push_back(rcbuf); +} + +#ifdef ENABLE_HTTP3 +void Downstream::add_rcbuf(nghttp3_rcbuf *rcbuf) { + nghttp3_rcbuf_incref(rcbuf); + rcbufs3_.push_back(rcbuf); +} +#endif // ENABLE_HTTP3 + +void Downstream::set_downstream_addr_group( + const std::shared_ptr<DownstreamAddrGroup> &group) { + group_ = group; +} + +void Downstream::set_addr(const DownstreamAddr *addr) { addr_ = addr; } + +const DownstreamAddr *Downstream::get_addr() const { return addr_; } + +void Downstream::set_accesslog_written(bool f) { accesslog_written_ = f; } + +void Downstream::renew_affinity_cookie(uint32_t h) { + affinity_cookie_ = h; + new_affinity_cookie_ = true; +} + +uint32_t Downstream::get_affinity_cookie_to_send() const { + if (new_affinity_cookie_) { + return affinity_cookie_; + } + return 0; +} + +DefaultMemchunks *Downstream::get_blocked_request_buf() { + return &blocked_request_buf_; +} + +bool Downstream::get_blocked_request_data_eof() const { + return blocked_request_data_eof_; +} + +void Downstream::set_blocked_request_data_eof(bool f) { + blocked_request_data_eof_ = f; +} + +void Downstream::set_ws_key(const StringRef &key) { ws_key_ = key; } + +bool Downstream::get_expect_100_continue() const { + return expect_100_continue_; +} + +bool Downstream::get_stop_reading() const { return stop_reading_; } + +void Downstream::set_stop_reading(bool f) { stop_reading_ = f; } + +} // namespace shrpx |