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)
113 void Server::process_client(Client *client)
115 switch (client->state) {
116 case Client::READING_REQUEST: {
117 // Try to read more of the request.
119 int ret = read(client->sock, buf, sizeof(buf));
122 close_client(client);
126 // No data? This really means that we were triggered for something else than
127 // POLLIN (which suggests a logic error in epoll).
128 fprintf(stderr, "WARNING: fd %d returned unexpectedly 0 bytes!\n", client->sock);
129 close_client(client);
133 // Guard against overlong requests gobbling up all of our space.
134 if (client->client_request.size() + ret > MAX_CLIENT_REQUEST) {
135 fprintf(stderr, "WARNING: fd %d sent overlong request!\n", client->sock);
136 close_client(client);
140 // See if we have \r\n\r\n anywhere in the request. We start three bytes
141 // before what we just appended, in case we just got the final character.
142 size_t existing_req_bytes = client->client_request.size();
143 client->client_request.append(string(buf, buf + ret));
145 size_t start_at = (existing_req_bytes >= 3 ? existing_req_bytes - 3 : 0);
146 const char *ptr = reinterpret_cast<char *>(
147 memmem(client->client_request.data() + start_at, client->client_request.size() - start_at,
150 // OK, we don't have the entire header yet. Fine; we'll get it later.
154 if (ptr != client->client_request.data() + client->client_request.size() - 4) {
155 fprintf(stderr, "WARNING: fd %d had junk data after request!\n", client->sock);
156 close_client(client);
160 parse_request(client);
163 case Client::SENDING_HEADER: {
164 int ret = write(client->sock,
165 client->header.data() + client->header_bytes_sent,
166 client->header.size() - client->header_bytes_sent);
169 close_client(client);
173 client->header_bytes_sent += ret;
174 assert(client->header_bytes_sent <= client->header.size());
176 if (client->header_bytes_sent < client->header.size()) {
177 // We haven't sent all yet. Fine; we'll do that later.
181 // We're done sending the header! Clear the entire header to release some memory.
182 client->header.clear();
184 // Start sending from the end. In other words, we won't send any of the backlog,
185 // but we'll start sending immediately as we get data.
186 client->state = Client::SENDING_DATA;
187 client->bytes_sent = streams[client->stream_id].data_size;
190 case Client::SENDING_DATA: {
191 // See if there's some data we've lost. Ideally, we should drop to a block boundary,
192 // but resync will be the mux's problem.
193 const Stream &stream = streams[client->stream_id];
194 size_t bytes_to_send = stream.data_size - client->bytes_sent;
195 if (bytes_to_send > BACKLOG_SIZE) {
196 fprintf(stderr, "WARNING: fd %d lost %lld bytes, maybe too slow connection\n",
198 (long long int)(bytes_to_send - BACKLOG_SIZE));
199 client->bytes_sent = streams[client->stream_id].data_size - BACKLOG_SIZE;
200 bytes_to_send = BACKLOG_SIZE;
203 // See if we need to split across the circular buffer.
205 if ((client->bytes_sent % BACKLOG_SIZE) + bytes_to_send > BACKLOG_SIZE) {
209 ret = write(client->sock,
210 stream.data + (client->bytes_sent % BACKLOG_SIZE),
214 perror("write/writev");
215 close_client(client);
218 client->bytes_sent += ret;
227 void Server::parse_request(Client *client)
229 // TODO: Actually parse the request. :-)
230 client->stream_id = "stream";
232 // Construct the header.
233 client->header = "HTTP/1.0 200 OK\r\nContent-type: todo/fixme\r\n\r\n" +
234 streams[client->stream_id].header;
237 client->state = Client::SENDING_HEADER;
240 ev.events = EPOLLOUT | EPOLLRDHUP;
241 ev.data.fd = client->sock;
243 if (epoll_ctl(epoll_fd, EPOLL_CTL_MOD, client->sock, &ev) == -1) {
244 perror("epoll_ctl(EPOLL_CTL_MOD)");
249 void Server::close_client(Client *client)
251 if (epoll_ctl(epoll_fd, EPOLL_CTL_DEL, client->sock, NULL) == -1) {
252 perror("epoll_ctl(EPOLL_CTL_DEL)");
258 clients.erase(client->sock);