01ed0ff041697ce1894c16652b374c66881e92f3
[cubemap] / server.cpp
1 #include <assert.h>
2 #include <errno.h>
3 #include <netinet/in.h>
4 #include <pthread.h>
5 #include <stdint.h>
6 #include <stdio.h>
7 #include <stdlib.h>
8 #include <string.h>
9 #include <sys/epoll.h>
10 #include <sys/sendfile.h>
11 #include <sys/socket.h>
12 #include <sys/types.h>
13 #include <unistd.h>
14 #include <algorithm>
15 #include <map>
16 #include <string>
17 #include <utility>
18 #include <vector>
19
20 #include "accesslog.h"
21 #include "log.h"
22 #include "metacube2.h"
23 #include "mutexlock.h"
24 #include "parse.h"
25 #include "server.h"
26 #include "state.pb.h"
27 #include "stream.h"
28 #include "util.h"
29
30 #ifndef SO_MAX_PACING_RATE
31 #define SO_MAX_PACING_RATE 47
32 #endif
33
34 using namespace std;
35
36 extern AccessLogThread *access_log;
37
38 namespace {
39
40 inline bool is_equal(timespec a, timespec b)
41 {
42         return a.tv_sec == b.tv_sec &&
43                a.tv_nsec == b.tv_nsec;
44 }
45
46 inline bool is_earlier(timespec a, timespec b)
47 {
48         if (a.tv_sec != b.tv_sec)
49                 return a.tv_sec < b.tv_sec;
50         return a.tv_nsec < b.tv_nsec;
51 }
52
53 }  // namespace
54
55 Server::Server()
56 {
57         pthread_mutex_init(&mutex, NULL);
58         pthread_mutex_init(&queued_clients_mutex, NULL);
59
60         epoll_fd = epoll_create(1024);  // Size argument is ignored.
61         if (epoll_fd == -1) {
62                 log_perror("epoll_fd");
63                 exit(1);
64         }
65 }
66
67 Server::~Server()
68 {
69         for (size_t i = 0; i < streams.size(); ++i) {   
70                 delete streams[i];
71         }
72
73         safe_close(epoll_fd);
74 }
75
76 vector<ClientStats> Server::get_client_stats() const
77 {
78         vector<ClientStats> ret;
79
80         MutexLock lock(&mutex);
81         for (map<int, Client>::const_iterator client_it = clients.begin();
82              client_it != clients.end();
83              ++client_it) {
84                 ret.push_back(client_it->second.get_stats());
85         }
86         return ret;
87 }
88
89 void Server::do_work()
90 {
91         while (!should_stop()) {
92                 // Wait until there's activity on at least one of the fds,
93                 // or 20 ms (about one frame at 50 fps) has elapsed.
94                 //
95                 // We could in theory wait forever and rely on wakeup()
96                 // from add_client_deferred() and add_data_deferred(),
97                 // but wakeup is a pretty expensive operation, and the
98                 // two threads might end up fighting over a lock, so it's
99                 // seemingly (much) more efficient to just have a timeout here.
100                 int nfds = epoll_pwait(epoll_fd, events, EPOLL_MAX_EVENTS, EPOLL_TIMEOUT_MS, &sigset_without_usr1_block);
101                 if (nfds == -1 && errno != EINTR) {
102                         log_perror("epoll_wait");
103                         exit(1);
104                 }
105
106                 MutexLock lock(&mutex);  // We release the mutex between iterations.
107         
108                 process_queued_data();
109
110                 // Process each client where we have socket activity.
111                 for (int i = 0; i < nfds; ++i) {
112                         Client *client = reinterpret_cast<Client *>(events[i].data.u64);
113
114                         if (events[i].events & (EPOLLERR | EPOLLRDHUP | EPOLLHUP)) {
115                                 close_client(client);
116                                 continue;
117                         }
118
119                         process_client(client);
120                 }
121
122                 // Process each client where its stream has new data,
123                 // even if there was no socket activity.
124                 for (size_t i = 0; i < streams.size(); ++i) {   
125                         vector<Client *> to_process;
126                         swap(streams[i]->to_process, to_process);
127                         for (size_t i = 0; i < to_process.size(); ++i) {
128                                 process_client(to_process[i]);
129                         }
130                 }
131
132                 // Finally, go through each client to see if it's timed out
133                 // in the READING_REQUEST state. (Seemingly there are clients
134                 // that can hold sockets up for days at a time without sending
135                 // anything at all.)
136                 timespec timeout_time;
137                 if (clock_gettime(CLOCK_MONOTONIC_COARSE, &timeout_time) == -1) {
138                         log_perror("clock_gettime(CLOCK_MONOTONIC_COARSE)");
139                         continue;
140                 }
141                 timeout_time.tv_sec -= REQUEST_READ_TIMEOUT_SEC;
142                 while (!clients_ordered_by_connect_time.empty()) {
143                         pair<timespec, int> &connect_time_and_fd = clients_ordered_by_connect_time.front();
144
145                         // See if we have reached the end of clients to process.
146                         if (is_earlier(timeout_time, connect_time_and_fd.first)) {
147                                 break;
148                         }
149
150                         // If this client doesn't exist anymore, just ignore it
151                         // (it was deleted earlier).
152                         std::map<int, Client>::iterator client_it = clients.find(connect_time_and_fd.second);
153                         if (client_it == clients.end()) {
154                                 clients_ordered_by_connect_time.pop();
155                                 continue;
156                         }
157                         Client *client = &client_it->second;
158                         if (!is_equal(client->connect_time, connect_time_and_fd.first)) {
159                                 // Another client has taken this fd in the meantime.
160                                 clients_ordered_by_connect_time.pop();
161                                 continue;
162                         }
163
164                         if (client->state != Client::READING_REQUEST) {
165                                 // Only READING_REQUEST can time out.
166                                 clients_ordered_by_connect_time.pop();
167                                 continue;
168                         }
169
170                         // OK, it timed out.
171                         close_client(client);
172                         clients_ordered_by_connect_time.pop();
173                 }
174         }
175 }
176
177 CubemapStateProto Server::serialize()
178 {
179         // We don't serialize anything queued, so empty the queues.
180         process_queued_data();
181
182         // Set all clients in a consistent state before serializing
183         // (ie., they have no remaining lost data). Otherwise, increasing
184         // the backlog could take clients into a newly valid area of the backlog,
185         // sending a stream of zeros instead of skipping the data as it should.
186         //
187         // TODO: Do this when clients are added back from serialized state instead;
188         // it would probably be less wasteful.
189         for (map<int, Client>::iterator client_it = clients.begin();
190              client_it != clients.end();
191              ++client_it) {
192                 skip_lost_data(&client_it->second);
193         }
194
195         CubemapStateProto serialized;
196         for (map<int, Client>::const_iterator client_it = clients.begin();
197              client_it != clients.end();
198              ++client_it) {
199                 serialized.add_clients()->MergeFrom(client_it->second.serialize());
200         }
201         for (size_t i = 0; i < streams.size(); ++i) {   
202                 serialized.add_streams()->MergeFrom(streams[i]->serialize());
203         }
204         return serialized;
205 }
206
207 void Server::add_client_deferred(int sock)
208 {
209         MutexLock lock(&queued_clients_mutex);
210         queued_add_clients.push_back(sock);
211 }
212
213 void Server::add_client(int sock)
214 {
215         pair<map<int, Client>::iterator, bool> ret =
216                 clients.insert(make_pair(sock, Client(sock)));
217         assert(ret.second == true);  // Should not already exist.
218         Client *client_ptr = &ret.first->second;
219
220         // Connection timestamps must be nondecreasing.
221         assert(clients_ordered_by_connect_time.empty() ||
222                !is_earlier(client_ptr->connect_time, clients_ordered_by_connect_time.back().first));
223         clients_ordered_by_connect_time.push(make_pair(client_ptr->connect_time, sock));
224
225         // Start listening on data from this socket.
226         epoll_event ev;
227         ev.events = EPOLLIN | EPOLLET | EPOLLRDHUP;
228         ev.data.u64 = reinterpret_cast<uint64_t>(client_ptr);
229         if (epoll_ctl(epoll_fd, EPOLL_CTL_ADD, sock, &ev) == -1) {
230                 log_perror("epoll_ctl(EPOLL_CTL_ADD)");
231                 exit(1);
232         }
233
234         process_client(client_ptr);
235 }
236
237 void Server::add_client_from_serialized(const ClientProto &client)
238 {
239         MutexLock lock(&mutex);
240         Stream *stream;
241         int stream_index = lookup_stream_by_url(client.url());
242         if (stream_index == -1) {
243                 assert(client.state() != Client::SENDING_DATA);
244                 stream = NULL;
245         } else {
246                 stream = streams[stream_index];
247         }
248         pair<map<int, Client>::iterator, bool> ret =
249                 clients.insert(make_pair(client.sock(), Client(client, stream)));
250         assert(ret.second == true);  // Should not already exist.
251         Client *client_ptr = &ret.first->second;
252
253         // Connection timestamps must be nondecreasing.
254         assert(clients_ordered_by_connect_time.empty() ||
255                !is_earlier(client_ptr->connect_time, clients_ordered_by_connect_time.back().first));
256         clients_ordered_by_connect_time.push(make_pair(client_ptr->connect_time, client.sock()));
257
258         // Start listening on data from this socket.
259         epoll_event ev;
260         if (client.state() == Client::READING_REQUEST) {
261                 ev.events = EPOLLIN | EPOLLET | EPOLLRDHUP;
262         } else {
263                 // If we don't have more data for this client, we'll be putting it into
264                 // the sleeping array again soon.
265                 ev.events = EPOLLOUT | EPOLLET | EPOLLRDHUP;
266         }
267         ev.data.u64 = reinterpret_cast<uint64_t>(client_ptr);
268         if (epoll_ctl(epoll_fd, EPOLL_CTL_ADD, client.sock(), &ev) == -1) {
269                 log_perror("epoll_ctl(EPOLL_CTL_ADD)");
270                 exit(1);
271         }
272
273         if (client_ptr->state == Client::WAITING_FOR_KEYFRAME ||
274             client_ptr->state == Client::PREBUFFERING ||
275             (client_ptr->state == Client::SENDING_DATA &&
276              client_ptr->stream_pos == client_ptr->stream->bytes_received)) {
277                 client_ptr->stream->put_client_to_sleep(client_ptr);
278         } else {
279                 process_client(client_ptr);
280         }
281 }
282
283 int Server::lookup_stream_by_url(const std::string &url) const
284 {
285         map<string, int>::const_iterator url_it = url_map.find(url);
286         if (url_it == url_map.end()) {
287                 return -1;
288         }
289         return url_it->second;
290 }
291
292 int Server::add_stream(const string &url, size_t backlog_size, size_t prebuffering_bytes, Stream::Encoding encoding)
293 {
294         MutexLock lock(&mutex);
295         url_map.insert(make_pair(url, streams.size()));
296         streams.push_back(new Stream(url, backlog_size, prebuffering_bytes, encoding));
297         return streams.size() - 1;
298 }
299
300 int Server::add_stream_from_serialized(const StreamProto &stream, int data_fd)
301 {
302         MutexLock lock(&mutex);
303         url_map.insert(make_pair(stream.url(), streams.size()));
304         streams.push_back(new Stream(stream, data_fd));
305         return streams.size() - 1;
306 }
307         
308 void Server::set_backlog_size(int stream_index, size_t new_size)
309 {
310         MutexLock lock(&mutex);
311         assert(stream_index >= 0 && stream_index < ssize_t(streams.size()));
312         streams[stream_index]->set_backlog_size(new_size);
313 }
314         
315 void Server::set_encoding(int stream_index, Stream::Encoding encoding)
316 {
317         MutexLock lock(&mutex);
318         assert(stream_index >= 0 && stream_index < ssize_t(streams.size()));
319         streams[stream_index]->encoding = encoding;
320 }
321         
322 void Server::set_header(int stream_index, const string &http_header, const string &stream_header)
323 {
324         MutexLock lock(&mutex);
325         assert(stream_index >= 0 && stream_index < ssize_t(streams.size()));
326         streams[stream_index]->http_header = http_header;
327         streams[stream_index]->stream_header = stream_header;
328 }
329         
330 void Server::set_pacing_rate(int stream_index, uint32_t pacing_rate)
331 {
332         MutexLock lock(&mutex);
333         assert(clients.empty());
334         assert(stream_index >= 0 && stream_index < ssize_t(streams.size()));
335         streams[stream_index]->pacing_rate = pacing_rate;
336 }
337
338 void Server::add_data_deferred(int stream_index, const char *data, size_t bytes, StreamStartSuitability suitable_for_stream_start)
339 {
340         assert(stream_index >= 0 && stream_index < ssize_t(streams.size()));
341         streams[stream_index]->add_data_deferred(data, bytes, suitable_for_stream_start);
342 }
343
344 // See the .h file for postconditions after this function.      
345 void Server::process_client(Client *client)
346 {
347         switch (client->state) {
348         case Client::READING_REQUEST: {
349 read_request_again:
350                 // Try to read more of the request.
351                 char buf[1024];
352                 int ret;
353                 do {
354                         ret = read(client->sock, buf, sizeof(buf));
355                 } while (ret == -1 && errno == EINTR);
356
357                 if (ret == -1 && errno == EAGAIN) {
358                         // No more data right now. Nothing to do.
359                         // This is postcondition #2.
360                         return;
361                 }
362                 if (ret == -1) {
363                         log_perror("read");
364                         close_client(client);
365                         return;
366                 }
367                 if (ret == 0) {
368                         // OK, the socket is closed.
369                         close_client(client);
370                         return;
371                 }
372
373                 RequestParseStatus status = wait_for_double_newline(&client->request, buf, ret);
374         
375                 switch (status) {
376                 case RP_OUT_OF_SPACE:
377                         log(WARNING, "[%s] Client sent overlong request!", client->remote_addr.c_str());
378                         close_client(client);
379                         return;
380                 case RP_NOT_FINISHED_YET:
381                         // OK, we don't have the entire header yet. Fine; we'll get it later.
382                         // See if there's more data for us.
383                         goto read_request_again;
384                 case RP_EXTRA_DATA:
385                         log(WARNING, "[%s] Junk data after request!", client->remote_addr.c_str());
386                         close_client(client);
387                         return;
388                 case RP_FINISHED:
389                         break;
390                 }
391
392                 assert(status == RP_FINISHED);
393
394                 int error_code = parse_request(client);
395                 if (error_code == 200) {
396                         construct_header(client);
397                 } else {
398                         construct_error(client, error_code);
399                 }
400
401                 // We've changed states, so fall through.
402                 assert(client->state == Client::SENDING_ERROR ||
403                        client->state == Client::SENDING_HEADER);
404         }
405         case Client::SENDING_ERROR:
406         case Client::SENDING_HEADER: {
407 sending_header_or_error_again:
408                 int ret;
409                 do {
410                         ret = write(client->sock,
411                                     client->header_or_error.data() + client->header_or_error_bytes_sent,
412                                     client->header_or_error.size() - client->header_or_error_bytes_sent);
413                 } while (ret == -1 && errno == EINTR);
414
415                 if (ret == -1 && errno == EAGAIN) {
416                         // We're out of socket space, so now we're at the “low edge” of epoll's
417                         // edge triggering. epoll will tell us when there is more room, so for now,
418                         // just return.
419                         // This is postcondition #4.
420                         return;
421                 }
422
423                 if (ret == -1) {
424                         // Error! Postcondition #1.
425                         log_perror("write");
426                         close_client(client);
427                         return;
428                 }
429                 
430                 client->header_or_error_bytes_sent += ret;
431                 assert(client->header_or_error_bytes_sent <= client->header_or_error.size());
432
433                 if (client->header_or_error_bytes_sent < client->header_or_error.size()) {
434                         // We haven't sent all yet. Fine; go another round.
435                         goto sending_header_or_error_again;
436                 }
437
438                 // We're done sending the header or error! Clear it to release some memory.
439                 client->header_or_error.clear();
440
441                 if (client->state == Client::SENDING_ERROR) {
442                         // We're done sending the error, so now close.  
443                         // This is postcondition #1.
444                         close_client(client);
445                         return;
446                 }
447
448                 // Start sending from the first keyframe we get. In other
449                 // words, we won't send any of the backlog, but we'll start
450                 // sending immediately as we get the next keyframe block.
451                 // This is postcondition #3.
452                 if (client->stream_pos == size_t(-2)) {
453                         client->stream_pos = std::min<size_t>(
454                             client->stream->bytes_received - client->stream->backlog_size,
455                             0);
456                         client->state = Client::SENDING_DATA;
457                 } else {
458                         // client->stream_pos should be -1, but it might not be,
459                         // if we have clients from an older version.
460                         client->stream_pos = client->stream->bytes_received;
461                         client->state = Client::WAITING_FOR_KEYFRAME;
462                 }
463                 client->stream->put_client_to_sleep(client);
464                 return;
465         }
466         case Client::WAITING_FOR_KEYFRAME: {
467                 Stream *stream = client->stream;
468                 if (ssize_t(client->stream_pos) > stream->last_suitable_starting_point) {
469                         // We haven't received a keyframe since this stream started waiting,
470                         // so keep on waiting for one.
471                         // This is postcondition #3.
472                         stream->put_client_to_sleep(client);
473                         return;
474                 }
475                 client->stream_pos = stream->last_suitable_starting_point;
476                 client->state = Client::PREBUFFERING;
477                 // Fall through.
478         }
479         case Client::PREBUFFERING: {
480                 Stream *stream = client->stream;
481                 size_t bytes_to_send = stream->bytes_received - client->stream_pos;
482                 assert(bytes_to_send <= stream->backlog_size);
483                 if (bytes_to_send < stream->prebuffering_bytes) {
484                         // We don't have enough bytes buffered to start this client yet.
485                         stream->put_client_to_sleep(client);
486                         return;
487                 }
488                 client->state = Client::SENDING_DATA;
489                 // Fall through.
490         }
491         case Client::SENDING_DATA: {
492                 skip_lost_data(client);
493                 Stream *stream = client->stream;
494
495 sending_data_again:
496                 size_t bytes_to_send = stream->bytes_received - client->stream_pos;
497                 assert(bytes_to_send <= stream->backlog_size);
498                 if (bytes_to_send == 0) {
499                         return;
500                 }
501
502                 // See if we need to split across the circular buffer.
503                 bool more_data = false;
504                 if ((client->stream_pos % stream->backlog_size) + bytes_to_send > stream->backlog_size) {
505                         bytes_to_send = stream->backlog_size - (client->stream_pos % stream->backlog_size);
506                         more_data = true;
507                 }
508
509                 ssize_t ret;
510                 do {
511                         off_t offset = client->stream_pos % stream->backlog_size;
512                         ret = sendfile(client->sock, stream->data_fd, &offset, bytes_to_send);
513                 } while (ret == -1 && errno == EINTR);
514
515                 if (ret == -1 && errno == EAGAIN) {
516                         // We're out of socket space, so return; epoll will wake us up
517                         // when there is more room.
518                         // This is postcondition #4.
519                         return;
520                 }
521                 if (ret == -1) {
522                         // Error, close; postcondition #1.
523                         log_perror("sendfile");
524                         close_client(client);
525                         return;
526                 }
527                 client->stream_pos += ret;
528                 client->bytes_sent += ret;
529
530                 if (client->stream_pos == stream->bytes_received) {
531                         // We don't have any more data for this client, so put it to sleep.
532                         // This is postcondition #3.
533                         stream->put_client_to_sleep(client);
534                 } else if (more_data && size_t(ret) == bytes_to_send) {
535                         goto sending_data_again;
536                 }
537                 break;
538         }
539         default:
540                 assert(false);
541         }
542 }
543
544 // See if there's some data we've lost. Ideally, we should drop to a block boundary,
545 // but resync will be the mux's problem.
546 void Server::skip_lost_data(Client *client)
547 {
548         Stream *stream = client->stream;
549         if (stream == NULL) {
550                 return;
551         }
552         size_t bytes_to_send = stream->bytes_received - client->stream_pos;
553         if (bytes_to_send > stream->backlog_size) {
554                 size_t bytes_lost = bytes_to_send - stream->backlog_size;
555                 client->stream_pos = stream->bytes_received - stream->backlog_size;
556                 client->bytes_lost += bytes_lost;
557                 ++client->num_loss_events;
558         }
559 }
560
561 int Server::parse_request(Client *client)
562 {
563         vector<string> lines = split_lines(client->request);
564         if (lines.empty()) {
565                 return 400;  // Bad request (empty).
566         }
567
568         vector<string> request_tokens = split_tokens(lines[0]);
569         if (request_tokens.size() < 2) {
570                 return 400;  // Bad request (empty).
571         }
572         if (request_tokens[0] != "GET") {
573                 return 400;  // Should maybe be 405 instead?
574         }
575
576         string url = request_tokens[1];
577         if (url.find("?backlog") == url.size() - 8) {
578                 client->stream_pos = -2;
579                 url = url.substr(0, url.size() - 8);
580         } else {
581                 client->stream_pos = -1;
582         }
583
584         map<string, int>::const_iterator url_map_it = url_map.find(url);
585         if (url_map_it == url_map.end()) {
586                 return 404;  // Not found.
587         }
588
589         Stream *stream = streams[url_map_it->second];
590         if (stream->http_header.empty()) {
591                 return 503;  // Service unavailable.
592         }
593
594         client->url = request_tokens[1];
595         client->stream = stream;
596         if (setsockopt(client->sock, SOL_SOCKET, SO_MAX_PACING_RATE, &client->stream->pacing_rate, sizeof(client->stream->pacing_rate)) == -1) {
597                 if (client->stream->pacing_rate != ~0U) {
598                         log_perror("setsockopt(SO_MAX_PACING_RATE)");
599                 }
600         }
601         client->request.clear();
602
603         return 200;  // OK!
604 }
605
606 void Server::construct_header(Client *client)
607 {
608         Stream *stream = client->stream;
609         if (stream->encoding == Stream::STREAM_ENCODING_RAW) {
610                 client->header_or_error = stream->http_header +
611                         "\r\n" +
612                         stream->stream_header;
613         } else if (stream->encoding == Stream::STREAM_ENCODING_METACUBE) {
614                 client->header_or_error = stream->http_header +
615                         "Content-encoding: metacube\r\n" +
616                         "\r\n";
617                 if (!stream->stream_header.empty()) {
618                         metacube2_block_header hdr;
619                         memcpy(hdr.sync, METACUBE2_SYNC, sizeof(hdr.sync));
620                         hdr.size = htonl(stream->stream_header.size());
621                         hdr.flags = htons(METACUBE_FLAGS_HEADER);
622                         hdr.csum = htons(metacube2_compute_crc(&hdr));
623                         client->header_or_error.append(
624                                 string(reinterpret_cast<char *>(&hdr), sizeof(hdr)));
625                 }
626                 client->header_or_error.append(stream->stream_header);
627         } else {
628                 assert(false);
629         }
630
631         // Switch states.
632         client->state = Client::SENDING_HEADER;
633
634         epoll_event ev;
635         ev.events = EPOLLOUT | EPOLLET | EPOLLRDHUP;
636         ev.data.u64 = reinterpret_cast<uint64_t>(client);
637
638         if (epoll_ctl(epoll_fd, EPOLL_CTL_MOD, client->sock, &ev) == -1) {
639                 log_perror("epoll_ctl(EPOLL_CTL_MOD)");
640                 exit(1);
641         }
642 }
643         
644 void Server::construct_error(Client *client, int error_code)
645 {
646         char error[256];
647         snprintf(error, 256, "HTTP/1.0 %d Error\r\nContent-type: text/plain\r\n\r\nSomething went wrong. Sorry.\r\n",
648                 error_code);
649         client->header_or_error = error;
650
651         // Switch states.
652         client->state = Client::SENDING_ERROR;
653
654         epoll_event ev;
655         ev.events = EPOLLOUT | EPOLLET | EPOLLRDHUP;
656         ev.data.u64 = reinterpret_cast<uint64_t>(client);
657
658         if (epoll_ctl(epoll_fd, EPOLL_CTL_MOD, client->sock, &ev) == -1) {
659                 log_perror("epoll_ctl(EPOLL_CTL_MOD)");
660                 exit(1);
661         }
662 }
663
664 template<class T>
665 void delete_from(vector<T> *v, T elem)
666 {
667         typename vector<T>::iterator new_end = remove(v->begin(), v->end(), elem);
668         v->erase(new_end, v->end());
669 }
670         
671 void Server::close_client(Client *client)
672 {
673         if (epoll_ctl(epoll_fd, EPOLL_CTL_DEL, client->sock, NULL) == -1) {
674                 log_perror("epoll_ctl(EPOLL_CTL_DEL)");
675                 exit(1);
676         }
677
678         // This client could be sleeping, so we'll need to fix that. (Argh, O(n).)
679         if (client->stream != NULL) {
680                 delete_from(&client->stream->sleeping_clients, client);
681                 delete_from(&client->stream->to_process, client);
682         }
683
684         // Log to access_log.
685         access_log->write(client->get_stats());
686
687         // Bye-bye!
688         safe_close(client->sock);
689
690         clients.erase(client->sock);
691 }
692         
693 void Server::process_queued_data()
694 {
695         {
696                 MutexLock lock(&queued_clients_mutex);
697
698                 for (size_t i = 0; i < queued_add_clients.size(); ++i) {
699                         add_client(queued_add_clients[i]);
700                 }
701                 queued_add_clients.clear();
702         }
703
704         for (size_t i = 0; i < streams.size(); ++i) {   
705                 streams[i]->process_queued_data();
706         }
707 }