+
+void Server::process_client(Client *client)
+{
+ switch (client->state) {
+ case Client::READING_REQUEST: {
+ // Try to read more of the request.
+ char buf[1024];
+ int ret = read(client->sock, buf, sizeof(buf));
+ if (ret == -1) {
+ perror("read");
+ close_client(client);
+ return;
+ }
+ if (ret == 0) {
+ // No data? This really means that we were triggered for something else than
+ // POLLIN (which suggests a logic error in epoll).
+ fprintf(stderr, "WARNING: fd %d returned unexpectedly 0 bytes!\n", client->sock);
+ close_client(client);
+ return;
+ }
+
+ // Guard against overlong requests gobbling up all of our space.
+ if (client->client_request.size() + ret > MAX_CLIENT_REQUEST) {
+ fprintf(stderr, "WARNING: fd %d sent overlong request!\n", client->sock);
+ close_client(client);
+ return;
+ }
+
+ // See if we have \r\n\r\n anywhere in the request. We start three bytes
+ // before what we just appended, in case we just got the final character.
+ size_t existing_req_bytes = client->client_request.size();
+ client->client_request.append(string(buf, buf + ret));
+
+ size_t start_at = (existing_req_bytes >= 3 ? existing_req_bytes - 3 : 0);
+ const char *ptr = reinterpret_cast<char *>(
+ memmem(client->client_request.data() + start_at, client->client_request.size() - start_at,
+ "\r\n\r\n", 4));
+ if (ptr == NULL) {
+ // OK, we don't have the entire header yet. Fine; we'll get it later.
+ return;
+ }
+
+ if (ptr != client->client_request.data() + client->client_request.size() - 4) {
+ fprintf(stderr, "WARNING: fd %d had junk data after request!\n", client->sock);
+ close_client(client);
+ return;
+ }
+
+ client->state = Client::SENDING_HEADER;
+
+ epoll_event ev;
+ ev.events = EPOLLOUT | EPOLLRDHUP;
+ ev.data.fd = client->sock;
+
+ if (epoll_ctl(epoll_fd, EPOLL_CTL_MOD, client->sock, &ev) == -1) {
+ perror("epoll_ctl(EPOLL_CTL_MOD)");
+ exit(1);
+ }
+ break;
+ }
+ default:
+ // TODO
+ assert(false);
+ }
+}
+
+void Server::close_client(Client *client)
+{
+ if (epoll_ctl(epoll_fd, EPOLL_CTL_DEL, client->sock, NULL) == -1) {
+ perror("epoll_ctl(EPOLL_CTL_DEL)");
+ exit(1);
+ }
+
+ // Bye-bye!
+ close(client->sock);
+ clients.erase(client->sock);
+}