7 #include <sys/socket.h>
10 #include <sys/ioctl.h>
11 #include <sys/epoll.h>
19 #include "mutexlock.h"
25 pthread_mutex_init(&mutex, NULL);
27 epoll_fd = epoll_create(1024); // Size argument is ignored.
37 pthread_create(&thread, NULL, Server::do_work_thunk, this);
40 void *Server::do_work_thunk(void *arg)
42 Server *server = static_cast<Server *>(arg);
47 void Server::do_work()
50 int nfds = epoll_wait(epoll_fd, events, EPOLL_MAX_EVENTS, EPOLL_TIMEOUT_MS);
52 MutexLock lock(&mutex); // We release the mutex between iterations.
58 for (int i = 0; i < nfds; ++i) {
59 int fd = events[i].data.fd;
60 assert(clients.count(fd) != 0);
61 Client *client = &clients[fd];
63 if (events[i].events & (EPOLLERR | EPOLLRDHUP | EPOLLHUP)) {
68 process_client(client);
73 void Server::add_client(int sock)
75 MutexLock lock(&mutex);
77 new_client.sock = sock;
78 new_client.client_request.reserve(1024);
79 new_client.state = Client::READING_REQUEST;
80 new_client.header_bytes_sent = 0;
81 new_client.bytes_sent = 0;
83 clients.insert(make_pair(sock, new_client));
85 // Start listening on data from this socket.
87 ev.events = EPOLLIN | EPOLLRDHUP;
89 if (epoll_ctl(epoll_fd, EPOLL_CTL_ADD, sock, &ev) == -1) {
90 perror("epoll_ctl(EPOLL_CTL_ADD)");
95 void Server::add_stream(const string &stream_id)
97 MutexLock lock(&mutex);
98 streams.insert(make_pair(stream_id, Stream()));
101 void Server::set_header(const string &stream_id, const string &header)
103 MutexLock lock(&mutex);
104 assert(streams.count(stream_id) != 0);
105 streams[stream_id].header = header;
108 void Server::add_data(const string &stream_id, const char *data, size_t bytes)
114 MutexLock lock(&mutex);
115 assert(streams.count(stream_id) != 0);
116 Stream *stream = &streams[stream_id];
117 size_t pos = stream->data_size % BACKLOG_SIZE;
118 stream->data_size += bytes;
120 if (pos + bytes > BACKLOG_SIZE) {
121 size_t to_copy = BACKLOG_SIZE - pos;
122 memcpy(stream->data + pos, data, to_copy);
128 memcpy(stream->data + pos, data, bytes);
129 wake_up_all_clients();
132 void Server::process_client(Client *client)
134 switch (client->state) {
135 case Client::READING_REQUEST: {
136 // Try to read more of the request.
138 int ret = read(client->sock, buf, sizeof(buf));
141 close_client(client);
145 // No data? This really means that we were triggered for something else than
146 // POLLIN (which suggests a logic error in epoll).
147 fprintf(stderr, "WARNING: fd %d returned unexpectedly 0 bytes!\n", client->sock);
148 close_client(client);
152 // Guard against overlong requests gobbling up all of our space.
153 if (client->client_request.size() + ret > MAX_CLIENT_REQUEST) {
154 fprintf(stderr, "WARNING: fd %d sent overlong request!\n", client->sock);
155 close_client(client);
159 // See if we have \r\n\r\n anywhere in the request. We start three bytes
160 // before what we just appended, in case we just got the final character.
161 size_t existing_req_bytes = client->client_request.size();
162 client->client_request.append(string(buf, buf + ret));
164 size_t start_at = (existing_req_bytes >= 3 ? existing_req_bytes - 3 : 0);
165 const char *ptr = reinterpret_cast<char *>(
166 memmem(client->client_request.data() + start_at, client->client_request.size() - start_at,
169 // OK, we don't have the entire header yet. Fine; we'll get it later.
173 if (ptr != client->client_request.data() + client->client_request.size() - 4) {
174 fprintf(stderr, "WARNING: fd %d had junk data after request!\n", client->sock);
175 close_client(client);
179 parse_request(client);
182 case Client::SENDING_HEADER: {
183 int ret = write(client->sock,
184 client->header.data() + client->header_bytes_sent,
185 client->header.size() - client->header_bytes_sent);
188 close_client(client);
192 client->header_bytes_sent += ret;
193 assert(client->header_bytes_sent <= client->header.size());
195 if (client->header_bytes_sent < client->header.size()) {
196 // We haven't sent all yet. Fine; we'll do that later.
200 // We're done sending the header! Clear the entire header to release some memory.
201 client->header.clear();
203 // Start sending from the end. In other words, we won't send any of the backlog,
204 // but we'll start sending immediately as we get data.
205 client->state = Client::SENDING_DATA;
206 client->bytes_sent = streams[client->stream_id].data_size;
209 case Client::SENDING_DATA: {
210 // See if there's some data we've lost. Ideally, we should drop to a block boundary,
211 // but resync will be the mux's problem.
212 const Stream &stream = streams[client->stream_id];
213 size_t bytes_to_send = stream.data_size - client->bytes_sent;
214 if (bytes_to_send > BACKLOG_SIZE) {
215 fprintf(stderr, "WARNING: fd %d lost %lld bytes, maybe too slow connection\n",
217 (long long int)(bytes_to_send - BACKLOG_SIZE));
218 client->bytes_sent = streams[client->stream_id].data_size - BACKLOG_SIZE;
219 bytes_to_send = BACKLOG_SIZE;
222 // See if we need to split across the circular buffer.
224 if ((client->bytes_sent % BACKLOG_SIZE) + bytes_to_send > BACKLOG_SIZE) {
228 ret = write(client->sock,
229 stream.data + (client->bytes_sent % BACKLOG_SIZE),
233 perror("write/writev");
234 close_client(client);
237 client->bytes_sent += ret;
239 if (client->bytes_sent == stream.data_size) {
240 // We don't have any more data for this client, so put it to sleep.
241 put_client_to_sleep(client);
251 void Server::parse_request(Client *client)
253 // TODO: Actually parse the request. :-)
254 client->stream_id = "stream";
256 // Construct the header.
257 client->header = "HTTP/1.0 200 OK\r\nContent-type: todo/fixme\r\n\r\n" +
258 streams[client->stream_id].header;
261 client->state = Client::SENDING_HEADER;
264 ev.events = EPOLLOUT | EPOLLRDHUP;
265 ev.data.fd = client->sock;
267 if (epoll_ctl(epoll_fd, EPOLL_CTL_MOD, client->sock, &ev) == -1) {
268 perror("epoll_ctl(EPOLL_CTL_MOD)");
273 void Server::close_client(Client *client)
275 if (epoll_ctl(epoll_fd, EPOLL_CTL_DEL, client->sock, NULL) == -1) {
276 perror("epoll_ctl(EPOLL_CTL_DEL)");
282 clients.erase(client->sock);
285 void Server::put_client_to_sleep(Client *client)
288 ev.events = EPOLLRDHUP;
289 ev.data.fd = client->sock;
291 if (epoll_ctl(epoll_fd, EPOLL_CTL_MOD, client->sock, &ev) == -1) {
292 perror("epoll_ctl(EPOLL_CTL_MOD)");
296 sleeping_clients.push_back(client->sock);
299 void Server::wake_up_all_clients()
301 for (unsigned i = 0; i < sleeping_clients.size(); ++i) {
303 ev.events = EPOLLOUT | EPOLLRDHUP;
304 ev.data.fd = sleeping_clients[i];
305 if (epoll_ctl(epoll_fd, EPOLL_CTL_MOD, sleeping_clients[i], &ev) == -1) {
306 perror("epoll_ctl(EPOLL_CTL_MOD)");
310 sleeping_clients.clear();