7 #include <sys/sendfile.h>
8 #include <sys/socket.h>
19 #include "mutexlock.h"
29 pthread_mutex_init(&mutex, NULL);
30 pthread_mutex_init(&queued_data_mutex, NULL);
32 epoll_fd = epoll_create(1024); // Size argument is ignored.
43 ret = close(epoll_fd);
44 } while (ret == -1 && errno == EINTR);
47 perror("close(epoll_fd)");
51 vector<ClientStats> Server::get_client_stats() const
53 vector<ClientStats> ret;
55 MutexLock lock(&mutex);
56 for (map<int, Client>::const_iterator client_it = clients.begin();
57 client_it != clients.end();
59 ret.push_back(client_it->second.get_stats());
64 void Server::do_work()
67 int nfds = epoll_wait(epoll_fd, events, EPOLL_MAX_EVENTS, EPOLL_TIMEOUT_MS);
68 if (nfds == -1 && errno == EINTR) {
79 MutexLock lock(&mutex); // We release the mutex between iterations.
81 process_queued_data();
83 for (int i = 0; i < nfds; ++i) {
84 int fd = events[i].data.fd;
85 assert(clients.count(fd) != 0);
86 Client *client = &clients[fd];
88 if (events[i].events & (EPOLLERR | EPOLLRDHUP | EPOLLHUP)) {
93 process_client(client);
96 for (map<string, Stream *>::iterator stream_it = streams.begin();
97 stream_it != streams.end();
99 vector<Client *> to_process;
100 swap(stream_it->second->to_process, to_process);
101 for (size_t i = 0; i < to_process.size(); ++i) {
102 process_client(to_process[i]);
112 CubemapStateProto Server::serialize()
114 // We don't serialize anything queued, so empty the queues.
115 process_queued_data();
117 CubemapStateProto serialized;
118 for (map<int, Client>::const_iterator client_it = clients.begin();
119 client_it != clients.end();
121 serialized.add_clients()->MergeFrom(client_it->second.serialize());
123 for (map<string, Stream *>::const_iterator stream_it = streams.begin();
124 stream_it != streams.end();
126 serialized.add_streams()->MergeFrom(stream_it->second->serialize());
131 void Server::add_client_deferred(int sock)
133 MutexLock lock(&queued_data_mutex);
134 queued_add_clients.push_back(sock);
137 void Server::add_client(int sock)
139 clients.insert(make_pair(sock, Client(sock)));
141 // Start listening on data from this socket.
143 ev.events = EPOLLIN | EPOLLET | EPOLLRDHUP;
144 ev.data.u64 = 0; // Keep Valgrind happy.
146 if (epoll_ctl(epoll_fd, EPOLL_CTL_ADD, sock, &ev) == -1) {
147 perror("epoll_ctl(EPOLL_CTL_ADD)");
151 process_client(&clients[sock]);
154 void Server::add_client_from_serialized(const ClientProto &client)
156 MutexLock lock(&mutex);
157 Stream *stream = find_stream(client.stream_id());
158 clients.insert(make_pair(client.sock(), Client(client, stream)));
159 Client *client_ptr = &clients[client.sock()];
161 // Start listening on data from this socket.
163 if (client.state() == Client::READING_REQUEST) {
164 ev.events = EPOLLIN | EPOLLET | EPOLLRDHUP;
166 // If we don't have more data for this client, we'll be putting it into
167 // the sleeping array again soon.
168 ev.events = EPOLLOUT | EPOLLET | EPOLLRDHUP;
170 ev.data.u64 = 0; // Keep Valgrind happy.
171 ev.data.fd = client.sock();
172 if (epoll_ctl(epoll_fd, EPOLL_CTL_ADD, client.sock(), &ev) == -1) {
173 perror("epoll_ctl(EPOLL_CTL_ADD)");
177 if (client_ptr->state == Client::SENDING_DATA &&
178 client_ptr->bytes_sent == client_ptr->stream->bytes_received) {
179 client_ptr->stream->put_client_to_sleep(client_ptr);
181 process_client(client_ptr);
185 void Server::add_stream(const string &stream_id, size_t backlog_size)
187 MutexLock lock(&mutex);
188 streams.insert(make_pair(stream_id, new Stream(stream_id, backlog_size)));
191 void Server::add_stream_from_serialized(const StreamProto &stream)
193 MutexLock lock(&mutex);
194 streams.insert(make_pair(stream.stream_id(), new Stream(stream)));
197 void Server::set_header(const string &stream_id, const string &header)
199 MutexLock lock(&mutex);
200 find_stream(stream_id)->header = header;
202 // If there are clients we haven't sent anything to yet, we should give
203 // them the header, so push back into the SENDING_HEADER state.
204 for (map<int, Client>::iterator client_it = clients.begin();
205 client_it != clients.end();
207 Client *client = &client_it->second;
208 if (client->state == Client::SENDING_DATA &&
209 client->bytes_sent == 0) {
210 construct_header(client);
215 void Server::set_mark_pool(const std::string &stream_id, MarkPool *mark_pool)
217 MutexLock lock(&mutex);
218 assert(clients.empty());
219 find_stream(stream_id)->mark_pool = mark_pool;
222 void Server::add_data_deferred(const string &stream_id, const char *data, size_t bytes)
224 MutexLock lock(&queued_data_mutex);
225 queued_data[stream_id].append(string(data, data + bytes));
228 void Server::add_data(const string &stream_id, const char *data, ssize_t bytes)
230 Stream *stream = find_stream(stream_id);
231 size_t pos = stream->bytes_received % stream->backlog_size;
232 stream->bytes_received += bytes;
234 if (pos + bytes > stream->backlog_size) {
235 ssize_t to_copy = stream->backlog_size - pos;
236 while (to_copy > 0) {
237 int ret = pwrite(stream->data_fd, data, to_copy, pos);
238 if (ret == -1 && errno == EINTR) {
243 // Dazed and confused, but trying to continue...
255 int ret = pwrite(stream->data_fd, data, bytes, pos);
256 if (ret == -1 && errno == EINTR) {
261 // Dazed and confused, but trying to continue...
269 stream->wake_up_all_clients();
272 // See the .h file for postconditions after this function.
273 void Server::process_client(Client *client)
275 switch (client->state) {
276 case Client::READING_REQUEST: {
278 // Try to read more of the request.
282 ret = read(client->sock, buf, sizeof(buf));
283 } while (ret == -1 && errno == EINTR);
285 if (ret == -1 && errno == EAGAIN) {
286 // No more data right now. Nothing to do.
287 // This is postcondition #2.
292 close_client(client);
296 // OK, the socket is closed.
297 close_client(client);
301 RequestParseStatus status = wait_for_double_newline(&client->request, buf, ret);
304 case RP_OUT_OF_SPACE:
305 fprintf(stderr, "WARNING: fd %d sent overlong request!\n", client->sock);
306 close_client(client);
308 case RP_NOT_FINISHED_YET:
309 // OK, we don't have the entire header yet. Fine; we'll get it later.
310 // See if there's more data for us.
311 goto read_request_again;
313 fprintf(stderr, "WARNING: fd %d had junk data after request!\n", client->sock);
314 close_client(client);
320 assert(status == RP_FINISHED);
322 int error_code = parse_request(client);
323 if (error_code == 200) {
324 construct_header(client);
326 construct_error(client, error_code);
329 // We've changed states, so fall through.
330 assert(client->state == Client::SENDING_ERROR ||
331 client->state == Client::SENDING_HEADER);
333 case Client::SENDING_ERROR:
334 case Client::SENDING_HEADER: {
335 sending_header_or_error_again:
338 ret = write(client->sock,
339 client->header_or_error.data() + client->header_or_error_bytes_sent,
340 client->header_or_error.size() - client->header_or_error_bytes_sent);
341 } while (ret == -1 && errno == EINTR);
343 if (ret == -1 && errno == EAGAIN) {
344 // We're out of socket space, so now we're at the “low edge” of epoll's
345 // edge triggering. epoll will tell us when there is more room, so for now,
347 // This is postcondition #4.
352 // Error! Postcondition #1.
354 close_client(client);
358 client->header_or_error_bytes_sent += ret;
359 assert(client->header_or_error_bytes_sent <= client->header_or_error.size());
361 if (client->header_or_error_bytes_sent < client->header_or_error.size()) {
362 // We haven't sent all yet. Fine; go another round.
363 goto sending_header_or_error_again;
366 // We're done sending the header or error! Clear it to release some memory.
367 client->header_or_error.clear();
369 if (client->state == Client::SENDING_ERROR) {
370 // We're done sending the error, so now close.
371 // This is postcondition #1.
372 close_client(client);
376 // Start sending from the end. In other words, we won't send any of the backlog,
377 // but we'll start sending immediately as we get data.
378 // This is postcondition #3.
379 client->state = Client::SENDING_DATA;
380 client->bytes_sent = client->stream->bytes_received;
381 client->stream->put_client_to_sleep(client);
384 case Client::SENDING_DATA: {
386 // See if there's some data we've lost. Ideally, we should drop to a block boundary,
387 // but resync will be the mux's problem.
388 Stream *stream = client->stream;
389 size_t bytes_to_send = stream->bytes_received - client->bytes_sent;
390 if (bytes_to_send == 0) {
393 if (bytes_to_send > stream->backlog_size) {
394 fprintf(stderr, "WARNING: fd %d lost %lld bytes, maybe too slow connection\n",
396 (long long int)(bytes_to_send - stream->backlog_size));
397 client->bytes_sent = stream->bytes_received - stream->backlog_size;
398 bytes_to_send = stream->backlog_size;
401 // See if we need to split across the circular buffer.
402 bool more_data = false;
403 if ((client->bytes_sent % stream->backlog_size) + bytes_to_send > stream->backlog_size) {
404 bytes_to_send = stream->backlog_size - (client->bytes_sent % stream->backlog_size);
410 loff_t offset = client->bytes_sent % stream->backlog_size;
411 ret = sendfile(client->sock, stream->data_fd, &offset, bytes_to_send);
412 } while (ret == -1 && errno == EINTR);
414 if (ret == -1 && errno == EAGAIN) {
415 // We're out of socket space, so return; epoll will wake us up
416 // when there is more room.
417 // This is postcondition #4.
421 // Error, close; postcondition #1.
423 close_client(client);
426 client->bytes_sent += ret;
428 if (client->bytes_sent == stream->bytes_received) {
429 // We don't have any more data for this client, so put it to sleep.
430 // This is postcondition #3.
431 stream->put_client_to_sleep(client);
432 } else if (more_data) {
433 goto sending_data_again;
442 int Server::parse_request(Client *client)
444 vector<string> lines = split_lines(client->request);
446 return 400; // Bad request (empty).
449 vector<string> request_tokens = split_tokens(lines[0]);
450 if (request_tokens.size() < 2) {
451 return 400; // Bad request (empty).
453 if (request_tokens[0] != "GET") {
454 return 400; // Should maybe be 405 instead?
456 if (streams.count(request_tokens[1]) == 0) {
457 return 404; // Not found.
460 client->stream_id = request_tokens[1];
461 client->stream = find_stream(client->stream_id);
462 if (client->stream->mark_pool != NULL) {
463 client->fwmark = client->stream->mark_pool->get_mark();
465 client->fwmark = 0; // No mark.
467 if (setsockopt(client->sock, SOL_SOCKET, SO_MARK, &client->fwmark, sizeof(client->fwmark)) == -1) {
468 if (client->fwmark != 0) {
469 perror("setsockopt(SO_MARK)");
472 client->request.clear();
477 void Server::construct_header(Client *client)
479 client->header_or_error = find_stream(client->stream_id)->header;
482 client->state = Client::SENDING_HEADER;
485 ev.events = EPOLLOUT | EPOLLET | EPOLLRDHUP;
486 ev.data.u64 = 0; // Keep Valgrind happy.
487 ev.data.fd = client->sock;
489 if (epoll_ctl(epoll_fd, EPOLL_CTL_MOD, client->sock, &ev) == -1) {
490 perror("epoll_ctl(EPOLL_CTL_MOD)");
495 void Server::construct_error(Client *client, int error_code)
498 snprintf(error, 256, "HTTP/1.0 %d Error\r\nContent-type: text/plain\r\n\r\nSomething went wrong. Sorry.\r\n",
500 client->header_or_error = error;
503 client->state = Client::SENDING_ERROR;
506 ev.events = EPOLLOUT | EPOLLET | EPOLLRDHUP;
507 ev.data.u64 = 0; // Keep Valgrind happy.
508 ev.data.fd = client->sock;
510 if (epoll_ctl(epoll_fd, EPOLL_CTL_MOD, client->sock, &ev) == -1) {
511 perror("epoll_ctl(EPOLL_CTL_MOD)");
517 void delete_from(vector<T> *v, T elem)
519 typename vector<T>::iterator new_end = remove(v->begin(), v->end(), elem);
520 v->erase(new_end, v->end());
523 void Server::close_client(Client *client)
525 if (epoll_ctl(epoll_fd, EPOLL_CTL_DEL, client->sock, NULL) == -1) {
526 perror("epoll_ctl(EPOLL_CTL_DEL)");
530 // This client could be sleeping, so we'll need to fix that. (Argh, O(n).)
531 if (client->stream != NULL) {
532 delete_from(&client->stream->sleeping_clients, client);
533 delete_from(&client->stream->to_process, client);
534 if (client->stream->mark_pool != NULL) {
535 int fwmark = client->fwmark;
536 client->stream->mark_pool->release_mark(fwmark);
543 ret = close(client->sock);
544 } while (ret == -1 && errno == EINTR);
550 clients.erase(client->sock);
553 Stream *Server::find_stream(const string &stream_id)
555 map<string, Stream *>::iterator it = streams.find(stream_id);
556 assert(it != streams.end());
560 void Server::process_queued_data()
562 MutexLock lock(&queued_data_mutex);
564 for (size_t i = 0; i < queued_add_clients.size(); ++i) {
565 add_client(queued_add_clients[i]);
567 queued_add_clients.clear();
569 for (map<string, string>::iterator queued_it = queued_data.begin();
570 queued_it != queued_data.end();
572 add_data(queued_it->first, queued_it->second.data(), queued_it->second.size());