nghttp2/src/h2load_spdy_session.cc

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/*
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* nghttp2 - HTTP/2 C Library
*
* Copyright (c) 2014 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 "h2load_spdy_session.h"
#include <cassert>
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#include <cerrno>
#include "h2load.h"
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#include "util.h"
using namespace nghttp2;
namespace h2load {
SpdySession::SpdySession(Client *client, uint16_t spdy_version)
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: client_(client), session_(nullptr), spdy_version_(spdy_version) {}
SpdySession::~SpdySession() { spdylay_session_del(session_); }
namespace {
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void before_ctrl_send_callback(spdylay_session *session,
spdylay_frame_type type, spdylay_frame *frame,
void *user_data) {
auto client = static_cast<Client *>(user_data);
if (type != SPDYLAY_SYN_STREAM) {
return;
}
client->on_request(frame->syn_stream.stream_id);
auto req_stat = client->get_req_stat(frame->syn_stream.stream_id);
client->record_request_time(req_stat);
}
} // namespace
namespace {
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void on_ctrl_recv_callback(spdylay_session *session, spdylay_frame_type type,
spdylay_frame *frame, void *user_data) {
auto client = static_cast<Client *>(user_data);
if (type != SPDYLAY_SYN_REPLY) {
return;
}
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for (auto p = frame->syn_reply.nv; *p; p += 2) {
auto name = *p;
auto value = *(p + 1);
auto namelen = strlen(name);
auto valuelen = strlen(value);
client->on_header(frame->syn_reply.stream_id,
reinterpret_cast<const uint8_t *>(name), namelen,
reinterpret_cast<const uint8_t *>(value), valuelen);
client->worker->stats.bytes_head_decomp += namelen + valuelen;
}
// Strictly speaking, we have to subtract 2 (unused field) if SPDY
// version is 2. But it is already deprecated, and we don't do
// extra work for it.
client->worker->stats.bytes_head += frame->syn_reply.hd.length - 4;
if (frame->syn_stream.hd.flags & SPDYLAY_CTRL_FLAG_FIN) {
client->record_ttfb();
}
}
} // namespace
namespace {
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void on_data_chunk_recv_callback(spdylay_session *session, uint8_t flags,
int32_t stream_id, const uint8_t *data,
size_t len, void *user_data) {
auto client = static_cast<Client *>(user_data);
client->record_ttfb();
client->worker->stats.bytes_body += len;
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auto spdy_session = static_cast<SpdySession *>(client->session.get());
spdy_session->handle_window_update(stream_id, len);
}
} // namespace
namespace {
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void on_stream_close_callback(spdylay_session *session, int32_t stream_id,
spdylay_status_code status_code,
void *user_data) {
auto client = static_cast<Client *>(user_data);
client->on_stream_close(stream_id, status_code == SPDYLAY_OK);
}
} // namespace
namespace {
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ssize_t send_callback(spdylay_session *session, const uint8_t *data,
size_t length, int flags, void *user_data) {
auto client = static_cast<Client *>(user_data);
auto &wb = client->wb;
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if (wb.rleft() >= BACKOFF_WRITE_BUFFER_THRES) {
return SPDYLAY_ERR_WOULDBLOCK;
}
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return wb.append(data, length);
}
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} // namespace
namespace {
ssize_t file_read_callback(spdylay_session *session, int32_t stream_id,
uint8_t *buf, size_t length, int *eof,
spdylay_data_source *source, void *user_data) {
auto client = static_cast<Client *>(user_data);
auto config = client->worker->config;
auto req_stat = client->get_req_stat(stream_id);
ssize_t nread;
while ((nread = pread(config->data_fd, buf, length, req_stat->data_offset)) ==
-1 &&
errno == EINTR)
;
if (nread == -1) {
return SPDYLAY_ERR_TEMPORAL_CALLBACK_FAILURE;
}
req_stat->data_offset += nread;
if (nread == 0 || req_stat->data_offset == config->data_length) {
*eof = 1;
}
return nread;
}
} // namespace
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void SpdySession::on_connect() {
spdylay_session_callbacks callbacks = {0};
callbacks.send_callback = send_callback;
callbacks.before_ctrl_send_callback = before_ctrl_send_callback;
callbacks.on_data_chunk_recv_callback = on_data_chunk_recv_callback;
callbacks.on_stream_close_callback = on_stream_close_callback;
callbacks.on_ctrl_recv_callback = on_ctrl_recv_callback;
spdylay_session_client_new(&session_, spdy_version_, &callbacks, client_);
int val = 1;
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spdylay_session_set_option(session_, SPDYLAY_OPT_NO_AUTO_WINDOW_UPDATE, &val,
sizeof(val));
spdylay_settings_entry iv;
iv.settings_id = SPDYLAY_SETTINGS_INITIAL_WINDOW_SIZE;
iv.flags = SPDYLAY_ID_FLAG_SETTINGS_NONE;
iv.value = (1 << client_->worker->config->window_bits);
spdylay_submit_settings(session_, SPDYLAY_FLAG_SETTINGS_NONE, &iv, 1);
auto config = client_->worker->config;
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if (spdy_version_ >= SPDYLAY_PROTO_SPDY3_1 &&
config->connection_window_bits > 16) {
auto delta =
(1 << config->connection_window_bits) - SPDYLAY_INITIAL_WINDOW_SIZE;
spdylay_submit_window_update(session_, 0, delta);
}
client_->signal_write();
}
int SpdySession::submit_request() {
int rv;
auto config = client_->worker->config;
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auto &nv = config->nv[client_->reqidx++];
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if (client_->reqidx == config->nv.size()) {
client_->reqidx = 0;
}
spdylay_data_provider prd{{0}, file_read_callback};
rv = spdylay_submit_request(session_, 0, nv.data(),
config->data_fd == -1 ? nullptr : &prd, nullptr);
if (rv != 0) {
return -1;
}
return 0;
}
int SpdySession::on_read(const uint8_t *data, size_t len) {
auto rv = spdylay_session_mem_recv(session_, data, len);
if (rv < 0) {
return -1;
}
assert(static_cast<size_t>(rv) == len);
if (spdylay_session_want_read(session_) == 0 &&
spdylay_session_want_write(session_) == 0 && client_->wb.rleft() == 0) {
return -1;
}
client_->signal_write();
return 0;
}
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int SpdySession::on_write() {
auto rv = spdylay_session_send(session_);
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if (rv != 0) {
return -1;
}
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if (spdylay_session_want_read(session_) == 0 &&
spdylay_session_want_write(session_) == 0 && client_->wb.rleft() == 0) {
return -1;
}
return 0;
}
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void SpdySession::terminate() {
spdylay_session_fail_session(session_, SPDYLAY_OK);
}
namespace {
int32_t determine_window_update_transmission(spdylay_session *session,
int32_t stream_id,
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size_t window_bits) {
int32_t recv_length;
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if (stream_id == 0) {
recv_length = spdylay_session_get_recv_data_length(session);
} else {
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recv_length =
spdylay_session_get_stream_recv_data_length(session, stream_id);
}
auto window_size = 1 << window_bits;
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if (recv_length != -1 && recv_length >= window_size / 2) {
return recv_length;
}
return -1;
}
} // namespace
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void SpdySession::handle_window_update(int32_t stream_id, size_t recvlen) {
auto config = client_->worker->config;
size_t connection_window_bits;
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if (config->connection_window_bits > 16) {
connection_window_bits = config->connection_window_bits;
} else {
connection_window_bits = 16;
}
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auto delta =
determine_window_update_transmission(session_, 0, connection_window_bits);
if (delta > 0) {
spdylay_submit_window_update(session_, 0, delta);
}
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delta = determine_window_update_transmission(session_, stream_id,
config->window_bits);
if (delta > 0) {
spdylay_submit_window_update(session_, stream_id, delta);
}
}
size_t SpdySession::max_concurrent_streams() {
return (size_t)client_->worker->config->max_concurrent_streams;
}
} // namespace h2load