+
+void Input::do_work()
+{
+ while (!should_stop) {
+ if (state == SENDING_REQUEST || state == RECEIVING_HEADER || state == RECEIVING_DATA) {
+ // Since we are non-blocking, we need to wait for the right state first.
+ // Wait up to 50 ms, then check should_stop.
+ pollfd pfd;
+ pfd.fd = sock;
+ pfd.events = (state == SENDING_REQUEST) ? POLLOUT : POLLIN;
+ pfd.events |= POLLRDHUP;
+
+ int nfds = poll(&pfd, 1, 50);
+ if (nfds == 0 || (nfds == -1 && errno == EINTR)) {
+ continue;
+ }
+ if (nfds == -1) {
+ perror("poll");
+ state = CLOSING_SOCKET;
+ }
+ }
+
+ switch (state) {
+ case NOT_CONNECTED:
+ request.clear();
+ request_bytes_sent = 0;
+ response.clear();
+
+ if (!parse_url(url, &host, &port, &path)) {
+ fprintf(stderr, "Failed to parse URL '%s'\n", url.c_str());
+ break;
+ }
+
+ sock = lookup_and_connect(host, port);
+ if (sock != -1) {
+ // Yay, successful connect. Try to set it as nonblocking.
+ int one = 1;
+ if (ioctl(sock, FIONBIO, &one) == -1) {
+ perror("ioctl(FIONBIO)");
+ state = CLOSING_SOCKET;
+ } else {
+ state = SENDING_REQUEST;
+ request = "GET " + path + " HTTP/1.0\r\nUser-Agent: cubemap\r\n\r\n";
+ request_bytes_sent = 0;
+ }
+ }
+ break;
+ case SENDING_REQUEST: {
+ size_t to_send = request.size() - request_bytes_sent;
+ int ret;
+
+ do {
+ ret = write(sock, request.data() + request_bytes_sent, to_send);
+ } while (ret == -1 && errno == EINTR);
+
+ if (ret == -1) {
+ perror("write");
+ state = CLOSING_SOCKET;
+ continue;
+ }
+
+ assert(ret >= 0);
+ request_bytes_sent += ret;
+
+ if (request_bytes_sent == request.size()) {
+ state = RECEIVING_HEADER;
+ }
+ break;
+ }
+ case RECEIVING_HEADER: {
+ char buf[4096];
+ int ret;
+
+ do {
+ ret = read(sock, buf, sizeof(buf));
+ } while (ret == -1 && errno == EINTR);
+
+ if (ret == -1) {
+ perror("read");
+ state = CLOSING_SOCKET;
+ continue;
+ }
+
+ if (ret == 0) {
+ // This really shouldn't happen...
+ fprintf(stderr, "Socket unexpectedly closed while reading header\n");
+ state = CLOSING_SOCKET;
+ continue;
+ }
+
+ RequestParseStatus status = wait_for_double_newline(&response, buf, ret);
+
+ if (status == RP_OUT_OF_SPACE) {
+ fprintf(stderr, "WARNING: fd %d sent overlong response!\n", sock);
+ state = CLOSING_SOCKET;
+ continue;
+ } else if (status == RP_NOT_FINISHED_YET) {
+ continue;
+ }