7 #include <sys/sendfile.h>
8 #include <sys/socket.h>
18 #include "mutexlock.h"
28 pthread_mutex_init(&mutex, NULL);
29 pthread_mutex_init(&queued_data_mutex, NULL);
31 epoll_fd = epoll_create(1024); // Size argument is ignored.
42 ret = close(epoll_fd);
43 } while (ret == -1 && errno == EINTR);
46 perror("close(epoll_fd)");
50 vector<ClientStats> Server::get_client_stats() const
52 vector<ClientStats> ret;
54 MutexLock lock(&mutex);
55 for (map<int, Client>::const_iterator client_it = clients.begin();
56 client_it != clients.end();
58 ret.push_back(client_it->second.get_stats());
63 void Server::do_work()
66 int nfds = epoll_wait(epoll_fd, events, EPOLL_MAX_EVENTS, EPOLL_TIMEOUT_MS);
67 if (nfds == -1 && errno == EINTR) {
78 MutexLock lock(&mutex); // We release the mutex between iterations.
80 process_queued_data();
82 for (int i = 0; i < nfds; ++i) {
83 int fd = events[i].data.fd;
84 assert(clients.count(fd) != 0);
85 Client *client = &clients[fd];
87 if (events[i].events & (EPOLLERR | EPOLLRDHUP | EPOLLHUP)) {
92 process_client(client);
95 for (map<string, Stream *>::iterator stream_it = streams.begin();
96 stream_it != streams.end();
98 vector<Client *> to_process;
99 swap(stream_it->second->to_process, to_process);
100 for (size_t i = 0; i < to_process.size(); ++i) {
101 process_client(to_process[i]);
111 CubemapStateProto Server::serialize()
113 // We don't serialize anything queued, so empty the queues.
114 process_queued_data();
116 CubemapStateProto serialized;
117 for (map<int, Client>::const_iterator client_it = clients.begin();
118 client_it != clients.end();
120 serialized.add_clients()->MergeFrom(client_it->second.serialize());
122 for (map<string, Stream *>::const_iterator stream_it = streams.begin();
123 stream_it != streams.end();
125 serialized.add_streams()->MergeFrom(stream_it->second->serialize());
130 void Server::add_client_deferred(int sock)
132 MutexLock lock(&queued_data_mutex);
133 queued_add_clients.push_back(sock);
136 void Server::add_client(int sock)
138 clients.insert(make_pair(sock, Client(sock)));
140 // Start listening on data from this socket.
142 ev.events = EPOLLIN | EPOLLET | EPOLLRDHUP;
143 ev.data.u64 = 0; // Keep Valgrind happy.
145 if (epoll_ctl(epoll_fd, EPOLL_CTL_ADD, sock, &ev) == -1) {
146 perror("epoll_ctl(EPOLL_CTL_ADD)");
150 process_client(&clients[sock]);
153 void Server::add_client_from_serialized(const ClientProto &client)
155 MutexLock lock(&mutex);
157 map<string, Stream *>::iterator stream_it = streams.find(client.stream_id());
158 if (stream_it == streams.end()) {
161 stream = stream_it->second;
163 clients.insert(make_pair(client.sock(), Client(client, stream)));
164 Client *client_ptr = &clients[client.sock()];
166 // Start listening on data from this socket.
168 if (client.state() == Client::READING_REQUEST) {
169 ev.events = EPOLLIN | EPOLLET | EPOLLRDHUP;
171 // If we don't have more data for this client, we'll be putting it into
172 // the sleeping array again soon.
173 ev.events = EPOLLOUT | EPOLLET | EPOLLRDHUP;
175 ev.data.u64 = 0; // Keep Valgrind happy.
176 ev.data.fd = client.sock();
177 if (epoll_ctl(epoll_fd, EPOLL_CTL_ADD, client.sock(), &ev) == -1) {
178 perror("epoll_ctl(EPOLL_CTL_ADD)");
182 if (client_ptr->state == Client::SENDING_DATA &&
183 client_ptr->stream_pos == client_ptr->stream->bytes_received) {
184 client_ptr->stream->put_client_to_sleep(client_ptr);
186 process_client(client_ptr);
190 void Server::add_stream(const string &stream_id, size_t backlog_size)
192 MutexLock lock(&mutex);
193 streams.insert(make_pair(stream_id, new Stream(stream_id, backlog_size)));
196 void Server::add_stream_from_serialized(const StreamProto &stream)
198 MutexLock lock(&mutex);
199 streams.insert(make_pair(stream.stream_id(), new Stream(stream)));
202 void Server::set_backlog_size(const std::string &stream_id, size_t new_size)
204 MutexLock lock(&mutex);
205 assert(streams.count(stream_id) != 0);
206 streams[stream_id]->set_backlog_size(new_size);
209 void Server::set_header(const string &stream_id, const string &header)
211 MutexLock lock(&mutex);
212 find_stream(stream_id)->header = header;
214 // If there are clients we haven't sent anything to yet, we should give
215 // them the header, so push back into the SENDING_HEADER state.
216 for (map<int, Client>::iterator client_it = clients.begin();
217 client_it != clients.end();
219 Client *client = &client_it->second;
220 if (client->state == Client::SENDING_DATA &&
221 client->stream_pos == 0) {
222 construct_header(client);
227 void Server::set_mark_pool(const std::string &stream_id, MarkPool *mark_pool)
229 MutexLock lock(&mutex);
230 assert(clients.empty());
231 find_stream(stream_id)->mark_pool = mark_pool;
234 void Server::add_data_deferred(const string &stream_id, const char *data, size_t bytes)
236 MutexLock lock(&queued_data_mutex);
237 queued_data[stream_id].append(string(data, data + bytes));
240 // See the .h file for postconditions after this function.
241 void Server::process_client(Client *client)
243 switch (client->state) {
244 case Client::READING_REQUEST: {
246 // Try to read more of the request.
250 ret = read(client->sock, buf, sizeof(buf));
251 } while (ret == -1 && errno == EINTR);
253 if (ret == -1 && errno == EAGAIN) {
254 // No more data right now. Nothing to do.
255 // This is postcondition #2.
260 close_client(client);
264 // OK, the socket is closed.
265 close_client(client);
269 RequestParseStatus status = wait_for_double_newline(&client->request, buf, ret);
272 case RP_OUT_OF_SPACE:
273 fprintf(stderr, "WARNING: fd %d sent overlong request!\n", client->sock);
274 close_client(client);
276 case RP_NOT_FINISHED_YET:
277 // OK, we don't have the entire header yet. Fine; we'll get it later.
278 // See if there's more data for us.
279 goto read_request_again;
281 fprintf(stderr, "WARNING: fd %d had junk data after request!\n", client->sock);
282 close_client(client);
288 assert(status == RP_FINISHED);
290 int error_code = parse_request(client);
291 if (error_code == 200) {
292 construct_header(client);
294 construct_error(client, error_code);
297 // We've changed states, so fall through.
298 assert(client->state == Client::SENDING_ERROR ||
299 client->state == Client::SENDING_HEADER);
301 case Client::SENDING_ERROR:
302 case Client::SENDING_HEADER: {
303 sending_header_or_error_again:
306 ret = write(client->sock,
307 client->header_or_error.data() + client->header_or_error_bytes_sent,
308 client->header_or_error.size() - client->header_or_error_bytes_sent);
309 } while (ret == -1 && errno == EINTR);
311 if (ret == -1 && errno == EAGAIN) {
312 // We're out of socket space, so now we're at the “low edge” of epoll's
313 // edge triggering. epoll will tell us when there is more room, so for now,
315 // This is postcondition #4.
320 // Error! Postcondition #1.
322 close_client(client);
326 client->header_or_error_bytes_sent += ret;
327 assert(client->header_or_error_bytes_sent <= client->header_or_error.size());
329 if (client->header_or_error_bytes_sent < client->header_or_error.size()) {
330 // We haven't sent all yet. Fine; go another round.
331 goto sending_header_or_error_again;
334 // We're done sending the header or error! Clear it to release some memory.
335 client->header_or_error.clear();
337 if (client->state == Client::SENDING_ERROR) {
338 // We're done sending the error, so now close.
339 // This is postcondition #1.
340 close_client(client);
344 // Start sending from the end. In other words, we won't send any of the backlog,
345 // but we'll start sending immediately as we get data.
346 // This is postcondition #3.
347 client->state = Client::SENDING_DATA;
348 client->stream_pos = client->stream->bytes_received;
349 client->stream->put_client_to_sleep(client);
352 case Client::SENDING_DATA: {
354 // See if there's some data we've lost. Ideally, we should drop to a block boundary,
355 // but resync will be the mux's problem.
356 Stream *stream = client->stream;
357 size_t bytes_to_send = stream->bytes_received - client->stream_pos;
358 if (bytes_to_send == 0) {
361 if (bytes_to_send > stream->backlog_size) {
362 fprintf(stderr, "WARNING: fd %d lost %lld bytes, maybe too slow connection\n",
364 (long long int)(bytes_to_send - stream->backlog_size));
365 client->stream_pos = stream->bytes_received - stream->backlog_size;
366 client->bytes_lost += bytes_to_send - stream->backlog_size;
367 ++client->num_loss_events;
368 bytes_to_send = stream->backlog_size;
371 // See if we need to split across the circular buffer.
372 bool more_data = false;
373 if ((client->stream_pos % stream->backlog_size) + bytes_to_send > stream->backlog_size) {
374 bytes_to_send = stream->backlog_size - (client->stream_pos % stream->backlog_size);
380 loff_t offset = client->stream_pos % stream->backlog_size;
381 ret = sendfile(client->sock, stream->data_fd, &offset, bytes_to_send);
382 } while (ret == -1 && errno == EINTR);
384 if (ret == -1 && errno == EAGAIN) {
385 // We're out of socket space, so return; epoll will wake us up
386 // when there is more room.
387 // This is postcondition #4.
391 // Error, close; postcondition #1.
393 close_client(client);
396 client->stream_pos += ret;
397 client->bytes_sent += ret;
399 if (client->stream_pos == stream->bytes_received) {
400 // We don't have any more data for this client, so put it to sleep.
401 // This is postcondition #3.
402 stream->put_client_to_sleep(client);
403 } else if (more_data && ret == bytes_to_send) {
404 goto sending_data_again;
413 int Server::parse_request(Client *client)
415 vector<string> lines = split_lines(client->request);
417 return 400; // Bad request (empty).
420 vector<string> request_tokens = split_tokens(lines[0]);
421 if (request_tokens.size() < 2) {
422 return 400; // Bad request (empty).
424 if (request_tokens[0] != "GET") {
425 return 400; // Should maybe be 405 instead?
427 if (streams.count(request_tokens[1]) == 0) {
428 return 404; // Not found.
431 client->stream_id = request_tokens[1];
432 client->stream = find_stream(client->stream_id);
433 if (client->stream->mark_pool != NULL) {
434 client->fwmark = client->stream->mark_pool->get_mark();
436 client->fwmark = 0; // No mark.
438 if (setsockopt(client->sock, SOL_SOCKET, SO_MARK, &client->fwmark, sizeof(client->fwmark)) == -1) {
439 if (client->fwmark != 0) {
440 perror("setsockopt(SO_MARK)");
443 client->request.clear();
448 void Server::construct_header(Client *client)
450 client->header_or_error = find_stream(client->stream_id)->header;
453 client->state = Client::SENDING_HEADER;
456 ev.events = EPOLLOUT | EPOLLET | EPOLLRDHUP;
457 ev.data.u64 = 0; // Keep Valgrind happy.
458 ev.data.fd = client->sock;
460 if (epoll_ctl(epoll_fd, EPOLL_CTL_MOD, client->sock, &ev) == -1) {
461 perror("epoll_ctl(EPOLL_CTL_MOD)");
466 void Server::construct_error(Client *client, int error_code)
469 snprintf(error, 256, "HTTP/1.0 %d Error\r\nContent-type: text/plain\r\n\r\nSomething went wrong. Sorry.\r\n",
471 client->header_or_error = error;
474 client->state = Client::SENDING_ERROR;
477 ev.events = EPOLLOUT | EPOLLET | EPOLLRDHUP;
478 ev.data.u64 = 0; // Keep Valgrind happy.
479 ev.data.fd = client->sock;
481 if (epoll_ctl(epoll_fd, EPOLL_CTL_MOD, client->sock, &ev) == -1) {
482 perror("epoll_ctl(EPOLL_CTL_MOD)");
488 void delete_from(vector<T> *v, T elem)
490 typename vector<T>::iterator new_end = remove(v->begin(), v->end(), elem);
491 v->erase(new_end, v->end());
494 void Server::close_client(Client *client)
496 if (epoll_ctl(epoll_fd, EPOLL_CTL_DEL, client->sock, NULL) == -1) {
497 perror("epoll_ctl(EPOLL_CTL_DEL)");
501 // This client could be sleeping, so we'll need to fix that. (Argh, O(n).)
502 if (client->stream != NULL) {
503 delete_from(&client->stream->sleeping_clients, client);
504 delete_from(&client->stream->to_process, client);
505 if (client->stream->mark_pool != NULL) {
506 int fwmark = client->fwmark;
507 client->stream->mark_pool->release_mark(fwmark);
514 ret = close(client->sock);
515 } while (ret == -1 && errno == EINTR);
521 clients.erase(client->sock);
524 Stream *Server::find_stream(const string &stream_id)
526 map<string, Stream *>::iterator it = streams.find(stream_id);
527 assert(it != streams.end());
531 void Server::process_queued_data()
533 MutexLock lock(&queued_data_mutex);
535 for (size_t i = 0; i < queued_add_clients.size(); ++i) {
536 add_client(queued_add_clients[i]);
538 queued_add_clients.clear();
540 for (map<string, string>::iterator queued_it = queued_data.begin();
541 queued_it != queued_data.end();
543 Stream *stream = find_stream(queued_it->first);
544 stream->add_data(queued_it->second.data(), queued_it->second.size());
545 stream->wake_up_all_clients();