1 files changed, 314 insertions, 0 deletions
diff --git a/src/h2load_http2_session.cc b/src/h2load_http2_session.cc
new file mode 100644
index 0000000..b058a33
--- /dev/null
+++ b/src/h2load_http2_session.cc
@@ -0,0 +1,314 @@
+/*
+ * 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_http2_session.h"
+
+#include <cassert>
+#include <cerrno>
+#include <iostream>
+
+#include "h2load.h"
+#include "util.h"
+#include "template.h"
+
+using namespace nghttp2;
+
+namespace h2load {
+
+Http2Session::Http2Session(Client *client)
+    : client_(client), session_(nullptr) {}
+
+Http2Session::~Http2Session() { nghttp2_session_del(session_); }
+
+namespace {
+int on_header_callback(nghttp2_session *session, const nghttp2_frame *frame,
+                       const uint8_t *name, size_t namelen,
+                       const uint8_t *value, size_t valuelen, uint8_t flags,
+                       void *user_data) {
+  auto client = static_cast<Client *>(user_data);
+  if (frame->hd.type != NGHTTP2_HEADERS) {
+    return 0;
+  }
+  client->on_header(frame->hd.stream_id, name, namelen, value, valuelen);
+  client->worker->stats.bytes_head_decomp += namelen + valuelen;
+
+  if (client->worker->config->verbose) {
+    std::cout << "[stream_id=" << frame->hd.stream_id << "] ";
+    std::cout.write(reinterpret_cast<const char *>(name), namelen);
+    std::cout << ": ";
+    std::cout.write(reinterpret_cast<const char *>(value), valuelen);
+    std::cout << "\n";
+  }
+
+  return 0;
+}
+} // namespace
+
+namespace {
+int on_frame_recv_callback(nghttp2_session *session, const nghttp2_frame *frame,
+                           void *user_data) {
+  auto client = static_cast<Client *>(user_data);
+  switch (frame->hd.type) {
+  case NGHTTP2_HEADERS:
+    client->worker->stats.bytes_head +=
+        frame->hd.length - frame->headers.padlen -
+        ((frame->hd.flags & NGHTTP2_FLAG_PRIORITY) ? 5 : 0);
+    // fall through
+  case NGHTTP2_DATA:
+    if (frame->hd.flags & NGHTTP2_FLAG_END_STREAM) {
+      client->record_ttfb();
+    }
+    break;
+  }
+  return 0;
+}
+} // namespace
+
+namespace {
+int on_data_chunk_recv_callback(nghttp2_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;
+  return 0;
+}
+} // namespace
+
+namespace {
+int on_stream_close_callback(nghttp2_session *session, int32_t stream_id,
+                             uint32_t error_code, void *user_data) {
+  auto client = static_cast<Client *>(user_data);
+  client->on_stream_close(stream_id, error_code == NGHTTP2_NO_ERROR);
+
+  return 0;
+}
+} // namespace
+
+namespace {
+int before_frame_send_callback(nghttp2_session *session,
+                               const nghttp2_frame *frame, void *user_data) {
+  if (frame->hd.type != NGHTTP2_HEADERS ||
+      frame->headers.cat != NGHTTP2_HCAT_REQUEST) {
+    return 0;
+  }
+
+  auto client = static_cast<Client *>(user_data);
+  auto req_stat = client->get_req_stat(frame->hd.stream_id);
+  assert(req_stat);
+  client->record_request_time(req_stat);
+
+  return 0;
+}
+} // namespace
+
+namespace {
+ssize_t file_read_callback(nghttp2_session *session, int32_t stream_id,
+                           uint8_t *buf, size_t length, uint32_t *data_flags,
+                           nghttp2_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);
+  assert(req_stat);
+  ssize_t nread;
+  while ((nread = pread(config->data_fd, buf, length, req_stat->data_offset)) ==
+             -1 &&
+         errno == EINTR)
+    ;
+
+  if (nread == -1) {
+    return NGHTTP2_ERR_TEMPORAL_CALLBACK_FAILURE;
+  }
+
+  req_stat->data_offset += nread;
+
+  if (req_stat->data_offset == config->data_length) {
+    *data_flags |= NGHTTP2_DATA_FLAG_EOF;
+    return nread;
+  }
+
+  if (req_stat->data_offset > config->data_length || nread == 0) {
+    return NGHTTP2_ERR_TEMPORAL_CALLBACK_FAILURE;
+  }
+
+  return nread;
+}
+
+} // namespace
+
+namespace {
+ssize_t send_callback(nghttp2_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;
+
+  if (wb.rleft() >= BACKOFF_WRITE_BUFFER_THRES) {
+    return NGHTTP2_ERR_WOULDBLOCK;
+  }
+
+  return wb.append(data, length);
+}
+} // namespace
+
+void Http2Session::on_connect() {
+  int rv;
+
+  // This is required with --disable-assert.
+  (void)rv;
+
+  nghttp2_session_callbacks *callbacks;
+
+  nghttp2_session_callbacks_new(&callbacks);
+
+  auto callbacks_deleter = defer(nghttp2_session_callbacks_del, callbacks);
+
+  nghttp2_session_callbacks_set_on_frame_recv_callback(callbacks,
+                                                       on_frame_recv_callback);
+
+  nghttp2_session_callbacks_set_on_data_chunk_recv_callback(
+      callbacks, on_data_chunk_recv_callback);
+
+  nghttp2_session_callbacks_set_on_stream_close_callback(
+      callbacks, on_stream_close_callback);
+
+  nghttp2_session_callbacks_set_on_header_callback(callbacks,
+                                                   on_header_callback);
+
+  nghttp2_session_callbacks_set_before_frame_send_callback(
+      callbacks, before_frame_send_callback);
+
+  nghttp2_session_callbacks_set_send_callback(callbacks, send_callback);
+
+  nghttp2_option *opt;
+
+  rv = nghttp2_option_new(&opt);
+  assert(rv == 0);
+
+  auto config = client_->worker->config;
+
+  if (config->encoder_header_table_size != NGHTTP2_DEFAULT_HEADER_TABLE_SIZE) {
+    nghttp2_option_set_max_deflate_dynamic_table_size(
+        opt, config->encoder_header_table_size);
+  }
+
+  nghttp2_session_client_new2(&session_, callbacks, client_, opt);
+
+  nghttp2_option_del(opt);
+
+  std::array<nghttp2_settings_entry, 4> iv;
+  size_t niv = 2;
+  iv[0].settings_id = NGHTTP2_SETTINGS_ENABLE_PUSH;
+  iv[0].value = 0;
+  iv[1].settings_id = NGHTTP2_SETTINGS_INITIAL_WINDOW_SIZE;
+  iv[1].value = (1 << config->window_bits) - 1;
+
+  if (config->header_table_size != NGHTTP2_DEFAULT_HEADER_TABLE_SIZE) {
+    iv[niv].settings_id = NGHTTP2_SETTINGS_HEADER_TABLE_SIZE;
+    iv[niv].value = config->header_table_size;
+    ++niv;
+  }
+  if (config->max_frame_size != 16_k) {
+    iv[niv].settings_id = NGHTTP2_SETTINGS_MAX_FRAME_SIZE;
+    iv[niv].value = config->max_frame_size;
+    ++niv;
+  }
+
+  rv = nghttp2_submit_settings(session_, NGHTTP2_FLAG_NONE, iv.data(), niv);
+
+  assert(rv == 0);
+
+  auto connection_window = (1 << config->connection_window_bits) - 1;
+  nghttp2_session_set_local_window_size(session_, NGHTTP2_FLAG_NONE, 0,
+                                        connection_window);
+
+  client_->signal_write();
+}
+
+int Http2Session::submit_request() {
+  if (nghttp2_session_check_request_allowed(session_) == 0) {
+    return -1;
+  }
+
+  auto config = client_->worker->config;
+  auto &nva = config->nva[client_->reqidx++];
+
+  if (client_->reqidx == config->nva.size()) {
+    client_->reqidx = 0;
+  }
+
+  nghttp2_data_provider prd{{0}, file_read_callback};
+
+  auto stream_id =
+      nghttp2_submit_request(session_, nullptr, nva.data(), nva.size(),
+                             config->data_fd == -1 ? nullptr : &prd, nullptr);
+  if (stream_id < 0) {
+    return -1;
+  }
+
+  client_->on_request(stream_id);
+
+  return 0;
+}
+
+int Http2Session::on_read(const uint8_t *data, size_t len) {
+  auto rv = nghttp2_session_mem_recv(session_, data, len);
+  if (rv < 0) {
+    return -1;
+  }
+
+  assert(static_cast<size_t>(rv) == len);
+
+  if (nghttp2_session_want_read(session_) == 0 &&
+      nghttp2_session_want_write(session_) == 0 && client_->wb.rleft() == 0) {
+    return -1;
+  }
+
+  client_->signal_write();
+
+  return 0;
+}
+
+int Http2Session::on_write() {
+  auto rv = nghttp2_session_send(session_);
+  if (rv != 0) {
+    return -1;
+  }
+
+  if (nghttp2_session_want_read(session_) == 0 &&
+      nghttp2_session_want_write(session_) == 0 && client_->wb.rleft() == 0) {
+    return -1;
+  }
+
+  return 0;
+}
+
+void Http2Session::terminate() {
+  nghttp2_session_terminate_session(session_, NGHTTP2_NO_ERROR);
+}
+
+size_t Http2Session::max_concurrent_streams() {
+  return (size_t)client_->worker->config->max_concurrent_streams;
+}
+
+} // namespace h2load