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);
156 Stream *stream = find_stream(client.stream_id());
157 clients.insert(make_pair(client.sock(), Client(client, stream)));
158 Client *client_ptr = &clients[client.sock()];
160 // Start listening on data from this socket.
162 if (client.state() == Client::READING_REQUEST) {
163 ev.events = EPOLLIN | EPOLLET | EPOLLRDHUP;
165 // If we don't have more data for this client, we'll be putting it into
166 // the sleeping array again soon.
167 ev.events = EPOLLOUT | EPOLLET | EPOLLRDHUP;
169 ev.data.u64 = 0; // Keep Valgrind happy.
170 ev.data.fd = client.sock();
171 if (epoll_ctl(epoll_fd, EPOLL_CTL_ADD, client.sock(), &ev) == -1) {
172 perror("epoll_ctl(EPOLL_CTL_ADD)");
176 if (client_ptr->state == Client::SENDING_DATA &&
177 client_ptr->bytes_sent == client_ptr->stream->bytes_received) {
178 client_ptr->stream->put_client_to_sleep(client_ptr);
180 process_client(client_ptr);
184 void Server::add_stream(const string &stream_id, size_t backlog_size)
186 MutexLock lock(&mutex);
187 streams.insert(make_pair(stream_id, new Stream(stream_id, backlog_size)));
190 void Server::add_stream_from_serialized(const StreamProto &stream)
192 MutexLock lock(&mutex);
193 streams.insert(make_pair(stream.stream_id(), new Stream(stream)));
196 void Server::set_backlog_size(const std::string &stream_id, size_t new_size)
198 MutexLock lock(&mutex);
199 assert(streams.count(stream_id) != 0);
200 streams[stream_id]->set_backlog_size(new_size);
203 void Server::set_header(const string &stream_id, const string &header)
205 MutexLock lock(&mutex);
206 find_stream(stream_id)->header = header;
208 // If there are clients we haven't sent anything to yet, we should give
209 // them the header, so push back into the SENDING_HEADER state.
210 for (map<int, Client>::iterator client_it = clients.begin();
211 client_it != clients.end();
213 Client *client = &client_it->second;
214 if (client->state == Client::SENDING_DATA &&
215 client->bytes_sent == 0) {
216 construct_header(client);
221 void Server::set_mark_pool(const std::string &stream_id, MarkPool *mark_pool)
223 MutexLock lock(&mutex);
224 assert(clients.empty());
225 find_stream(stream_id)->mark_pool = mark_pool;
228 void Server::add_data_deferred(const string &stream_id, const char *data, size_t bytes)
230 MutexLock lock(&queued_data_mutex);
231 queued_data[stream_id].append(string(data, data + bytes));
234 // See the .h file for postconditions after this function.
235 void Server::process_client(Client *client)
237 switch (client->state) {
238 case Client::READING_REQUEST: {
240 // Try to read more of the request.
244 ret = read(client->sock, buf, sizeof(buf));
245 } while (ret == -1 && errno == EINTR);
247 if (ret == -1 && errno == EAGAIN) {
248 // No more data right now. Nothing to do.
249 // This is postcondition #2.
254 close_client(client);
258 // OK, the socket is closed.
259 close_client(client);
263 RequestParseStatus status = wait_for_double_newline(&client->request, buf, ret);
266 case RP_OUT_OF_SPACE:
267 fprintf(stderr, "WARNING: fd %d sent overlong request!\n", client->sock);
268 close_client(client);
270 case RP_NOT_FINISHED_YET:
271 // OK, we don't have the entire header yet. Fine; we'll get it later.
272 // See if there's more data for us.
273 goto read_request_again;
275 fprintf(stderr, "WARNING: fd %d had junk data after request!\n", client->sock);
276 close_client(client);
282 assert(status == RP_FINISHED);
284 int error_code = parse_request(client);
285 if (error_code == 200) {
286 construct_header(client);
288 construct_error(client, error_code);
291 // We've changed states, so fall through.
292 assert(client->state == Client::SENDING_ERROR ||
293 client->state == Client::SENDING_HEADER);
295 case Client::SENDING_ERROR:
296 case Client::SENDING_HEADER: {
297 sending_header_or_error_again:
300 ret = write(client->sock,
301 client->header_or_error.data() + client->header_or_error_bytes_sent,
302 client->header_or_error.size() - client->header_or_error_bytes_sent);
303 } while (ret == -1 && errno == EINTR);
305 if (ret == -1 && errno == EAGAIN) {
306 // We're out of socket space, so now we're at the “low edge” of epoll's
307 // edge triggering. epoll will tell us when there is more room, so for now,
309 // This is postcondition #4.
314 // Error! Postcondition #1.
316 close_client(client);
320 client->header_or_error_bytes_sent += ret;
321 assert(client->header_or_error_bytes_sent <= client->header_or_error.size());
323 if (client->header_or_error_bytes_sent < client->header_or_error.size()) {
324 // We haven't sent all yet. Fine; go another round.
325 goto sending_header_or_error_again;
328 // We're done sending the header or error! Clear it to release some memory.
329 client->header_or_error.clear();
331 if (client->state == Client::SENDING_ERROR) {
332 // We're done sending the error, so now close.
333 // This is postcondition #1.
334 close_client(client);
338 // Start sending from the end. In other words, we won't send any of the backlog,
339 // but we'll start sending immediately as we get data.
340 // This is postcondition #3.
341 client->state = Client::SENDING_DATA;
342 client->bytes_sent = client->stream->bytes_received;
343 client->stream->put_client_to_sleep(client);
346 case Client::SENDING_DATA: {
348 // See if there's some data we've lost. Ideally, we should drop to a block boundary,
349 // but resync will be the mux's problem.
350 Stream *stream = client->stream;
351 size_t bytes_to_send = stream->bytes_received - client->bytes_sent;
352 if (bytes_to_send == 0) {
355 if (bytes_to_send > stream->backlog_size) {
356 fprintf(stderr, "WARNING: fd %d lost %lld bytes, maybe too slow connection\n",
358 (long long int)(bytes_to_send - stream->backlog_size));
359 client->bytes_sent = stream->bytes_received - stream->backlog_size;
360 bytes_to_send = stream->backlog_size;
363 // See if we need to split across the circular buffer.
364 bool more_data = false;
365 if ((client->bytes_sent % stream->backlog_size) + bytes_to_send > stream->backlog_size) {
366 bytes_to_send = stream->backlog_size - (client->bytes_sent % stream->backlog_size);
372 loff_t offset = client->bytes_sent % stream->backlog_size;
373 ret = sendfile(client->sock, stream->data_fd, &offset, bytes_to_send);
374 } while (ret == -1 && errno == EINTR);
376 if (ret == -1 && errno == EAGAIN) {
377 // We're out of socket space, so return; epoll will wake us up
378 // when there is more room.
379 // This is postcondition #4.
383 // Error, close; postcondition #1.
385 close_client(client);
388 client->bytes_sent += ret;
390 if (client->bytes_sent == stream->bytes_received) {
391 // We don't have any more data for this client, so put it to sleep.
392 // This is postcondition #3.
393 stream->put_client_to_sleep(client);
394 } else if (more_data) {
395 goto sending_data_again;
404 int Server::parse_request(Client *client)
406 vector<string> lines = split_lines(client->request);
408 return 400; // Bad request (empty).
411 vector<string> request_tokens = split_tokens(lines[0]);
412 if (request_tokens.size() < 2) {
413 return 400; // Bad request (empty).
415 if (request_tokens[0] != "GET") {
416 return 400; // Should maybe be 405 instead?
418 if (streams.count(request_tokens[1]) == 0) {
419 return 404; // Not found.
422 client->stream_id = request_tokens[1];
423 client->stream = find_stream(client->stream_id);
424 if (client->stream->mark_pool != NULL) {
425 client->fwmark = client->stream->mark_pool->get_mark();
427 client->fwmark = 0; // No mark.
429 if (setsockopt(client->sock, SOL_SOCKET, SO_MARK, &client->fwmark, sizeof(client->fwmark)) == -1) {
430 if (client->fwmark != 0) {
431 perror("setsockopt(SO_MARK)");
434 client->request.clear();
439 void Server::construct_header(Client *client)
441 client->header_or_error = find_stream(client->stream_id)->header;
444 client->state = Client::SENDING_HEADER;
447 ev.events = EPOLLOUT | EPOLLET | EPOLLRDHUP;
448 ev.data.u64 = 0; // Keep Valgrind happy.
449 ev.data.fd = client->sock;
451 if (epoll_ctl(epoll_fd, EPOLL_CTL_MOD, client->sock, &ev) == -1) {
452 perror("epoll_ctl(EPOLL_CTL_MOD)");
457 void Server::construct_error(Client *client, int error_code)
460 snprintf(error, 256, "HTTP/1.0 %d Error\r\nContent-type: text/plain\r\n\r\nSomething went wrong. Sorry.\r\n",
462 client->header_or_error = error;
465 client->state = Client::SENDING_ERROR;
468 ev.events = EPOLLOUT | EPOLLET | EPOLLRDHUP;
469 ev.data.u64 = 0; // Keep Valgrind happy.
470 ev.data.fd = client->sock;
472 if (epoll_ctl(epoll_fd, EPOLL_CTL_MOD, client->sock, &ev) == -1) {
473 perror("epoll_ctl(EPOLL_CTL_MOD)");
479 void delete_from(vector<T> *v, T elem)
481 typename vector<T>::iterator new_end = remove(v->begin(), v->end(), elem);
482 v->erase(new_end, v->end());
485 void Server::close_client(Client *client)
487 if (epoll_ctl(epoll_fd, EPOLL_CTL_DEL, client->sock, NULL) == -1) {
488 perror("epoll_ctl(EPOLL_CTL_DEL)");
492 // This client could be sleeping, so we'll need to fix that. (Argh, O(n).)
493 if (client->stream != NULL) {
494 delete_from(&client->stream->sleeping_clients, client);
495 delete_from(&client->stream->to_process, client);
496 if (client->stream->mark_pool != NULL) {
497 int fwmark = client->fwmark;
498 client->stream->mark_pool->release_mark(fwmark);
505 ret = close(client->sock);
506 } while (ret == -1 && errno == EINTR);
512 clients.erase(client->sock);
515 Stream *Server::find_stream(const string &stream_id)
517 map<string, Stream *>::iterator it = streams.find(stream_id);
518 assert(it != streams.end());
522 void Server::process_queued_data()
524 MutexLock lock(&queued_data_mutex);
526 for (size_t i = 0; i < queued_add_clients.size(); ++i) {
527 add_client(queued_add_clients[i]);
529 queued_add_clients.clear();
531 for (map<string, string>::iterator queued_it = queued_data.begin();
532 queued_it != queued_data.end();
534 Stream *stream = find_stream(queued_it->first);
535 stream->add_data(queued_it->second.data(), queued_it->second.size());
536 stream->wake_up_all_clients();