7 #include <sys/socket.h>
10 #include <sys/ioctl.h>
11 #include <sys/types.h>
12 #include <sys/socket.h>
22 #include "mutexlock.h"
23 #include "httpinput.h"
25 #include "serverpool.h"
32 extern ServerPool *servers;
34 HTTPInput::HTTPInput(const string &stream_id, const string &url)
35 : state(NOT_CONNECTED),
38 has_metacube_header(false),
43 HTTPInput::HTTPInput(const InputProto &serialized)
44 : state(State(serialized.state())),
45 stream_id(serialized.stream_id()),
46 url(serialized.url()),
47 request(serialized.request()),
48 request_bytes_sent(serialized.request_bytes_sent()),
49 response(serialized.response()),
50 http_header(serialized.http_header()),
51 has_metacube_header(serialized.has_metacube_header()),
52 sock(serialized.sock())
54 pending_data.resize(serialized.pending_data().size());
55 memcpy(&pending_data[0], serialized.pending_data().data(), serialized.pending_data().size());
58 parse_url(url, &protocol, &host, &port, &path); // Don't care if it fails.
61 void HTTPInput::close_socket()
66 } while (ret == -1 && errno == EINTR);
73 InputProto HTTPInput::serialize() const
75 InputProto serialized;
76 serialized.set_state(state);
77 serialized.set_stream_id(stream_id);
78 serialized.set_url(url);
79 serialized.set_request(request);
80 serialized.set_request_bytes_sent(request_bytes_sent);
81 serialized.set_response(response);
82 serialized.set_http_header(http_header);
83 serialized.set_pending_data(string(pending_data.begin(), pending_data.end()));
84 serialized.set_has_metacube_header(has_metacube_header);
85 serialized.set_sock(sock);
89 int HTTPInput::lookup_and_connect(const string &host, const string &port)
92 int err = getaddrinfo(host.c_str(), port.c_str(), NULL, &ai);
94 fprintf(stderr, "WARNING: Lookup of '%s' failed (%s).\n",
95 host.c_str(), gai_strerror(err));
100 // Connect to everything in turn until we have a socket.
101 while (ai && !should_stop) {
102 int sock = socket(ai->ai_family, SOCK_STREAM, IPPROTO_TCP);
104 // Could be e.g. EPROTONOSUPPORT. The show must go on.
109 err = connect(sock, ai->ai_addr, ai->ai_addrlen);
110 } while (err == -1 && errno == EINTR);
120 // Give the last one as error.
121 fprintf(stderr, "WARNING: Connect to '%s' failed (%s)\n",
122 host.c_str(), strerror(errno));
127 bool HTTPInput::parse_response(const std::string &request)
129 vector<string> lines = split_lines(response);
131 fprintf(stderr, "WARNING: Empty HTTP response from input.\n");
135 vector<string> first_line_tokens = split_tokens(lines[0]);
136 if (first_line_tokens.size() < 2) {
137 fprintf(stderr, "WARNING: Malformed response line '%s' from input.\n",
142 int response = atoi(first_line_tokens[1].c_str());
143 if (response != 200) {
144 fprintf(stderr, "WARNING: Non-200 response '%s' from input.\n",
149 multimap<string, string> parameters;
150 for (size_t i = 1; i < lines.size(); ++i) {
151 size_t split = lines[i].find(":");
152 if (split == string::npos) {
153 fprintf(stderr, "WARNING: Ignoring malformed HTTP response line '%s'\n",
158 string key(lines[i].begin(), lines[i].begin() + split);
160 // Skip any spaces after the colon.
163 } while (split < lines[i].size() && lines[i][split] == ' ');
165 string value(lines[i].begin() + split, lines[i].end());
167 // Remove “Content-encoding: metacube”.
168 // TODO: Make case-insensitive.
169 if (key == "Content-encoding" && value == "metacube") {
173 parameters.insert(make_pair(key, value));
176 // Change “Server: foo” to “Server: metacube/0.1 (reflecting: foo)”
177 // TODO: Make case-insensitive.
178 // XXX: Use a Via: instead?
179 if (parameters.count("Server") == 0) {
180 parameters.insert(make_pair("Server", SERVER_IDENTIFICATION));
182 for (multimap<string, string>::iterator it = parameters.begin();
183 it != parameters.end();
185 if (it->first != "Server") {
188 it->second = SERVER_IDENTIFICATION " (reflecting: " + it->second + ")";
192 // Construct the new HTTP header.
193 http_header = "HTTP/1.0 200 OK\r\n";
194 for (multimap<string, string>::iterator it = parameters.begin();
195 it != parameters.end();
197 http_header.append(it->first + ": " + it->second + "\r\n");
199 http_header.append("\r\n");
200 servers->set_header(stream_id, http_header);
205 void HTTPInput::do_work()
207 while (!should_stop) {
208 if (state == SENDING_REQUEST || state == RECEIVING_HEADER || state == RECEIVING_DATA) {
209 // Since we are non-blocking, we need to wait for the right state first.
210 // Wait up to 50 ms, then check should_stop.
213 pfd.events = (state == SENDING_REQUEST) ? POLLOUT : POLLIN;
214 pfd.events |= POLLRDHUP;
216 int nfds = poll(&pfd, 1, 50);
217 if (nfds == 0 || (nfds == -1 && errno == EINTR)) {
222 state = CLOSING_SOCKET;
229 request_bytes_sent = 0;
231 pending_data.clear();
234 string protocol; // Thrown away.
235 if (!parse_url(url, &protocol, &host, &port, &path)) {
236 fprintf(stderr, "Failed to parse URL '%s'\n", url.c_str());
241 sock = lookup_and_connect(host, port);
243 // Yay, successful connect. Try to set it as nonblocking.
245 if (ioctl(sock, FIONBIO, &one) == -1) {
246 perror("ioctl(FIONBIO)");
247 state = CLOSING_SOCKET;
249 state = SENDING_REQUEST;
250 request = "GET " + path + " HTTP/1.0\r\nUser-Agent: cubemap\r\n\r\n";
251 request_bytes_sent = 0;
255 case SENDING_REQUEST: {
256 size_t to_send = request.size() - request_bytes_sent;
260 ret = write(sock, request.data() + request_bytes_sent, to_send);
261 } while (ret == -1 && errno == EINTR);
265 state = CLOSING_SOCKET;
270 request_bytes_sent += ret;
272 if (request_bytes_sent == request.size()) {
273 state = RECEIVING_HEADER;
277 case RECEIVING_HEADER: {
282 ret = read(sock, buf, sizeof(buf));
283 } while (ret == -1 && errno == EINTR);
287 state = CLOSING_SOCKET;
292 // This really shouldn't happen...
293 fprintf(stderr, "Socket unexpectedly closed while reading header\n");
294 state = CLOSING_SOCKET;
298 RequestParseStatus status = wait_for_double_newline(&response, buf, ret);
300 if (status == RP_OUT_OF_SPACE) {
301 fprintf(stderr, "WARNING: fd %d sent overlong response!\n", sock);
302 state = CLOSING_SOCKET;
304 } else if (status == RP_NOT_FINISHED_YET) {
308 // OK, so we're fine, but there might be some of the actual data after the response.
309 // We'll need to deal with that separately.
311 if (status == RP_EXTRA_DATA) {
312 char *ptr = static_cast<char *>(
313 memmem(response.data(), response.size(), "\r\n\r\n", 4));
315 extra_data = string(ptr, &response[0] + response.size());
316 response.resize(ptr - response.data());
319 if (!parse_response(response)) {
320 state = CLOSING_SOCKET;
324 if (!extra_data.empty()) {
325 process_data(&extra_data[0], extra_data.size());
328 state = RECEIVING_DATA;
331 case RECEIVING_DATA: {
336 ret = read(sock, buf, sizeof(buf));
337 } while (ret == -1 && errno == EINTR);
341 state = CLOSING_SOCKET;
346 // This really shouldn't happen...
347 fprintf(stderr, "Socket unexpectedly closed while reading header\n");
348 state = CLOSING_SOCKET;
352 process_data(buf, ret);
355 case CLOSING_SOCKET: {
359 } while (err == -1 && errno == EINTR);
365 state = NOT_CONNECTED;
372 // If we are still in NOT_CONNECTED, either something went wrong,
373 // or the connection just got closed.
374 // The earlier steps have already given the error message, if any.
375 if (state == NOT_CONNECTED && !should_stop) {
376 fprintf(stderr, "Waiting 0.2 second and restarting...\n");
382 void HTTPInput::process_data(char *ptr, size_t bytes)
384 pending_data.insert(pending_data.end(), ptr, ptr + bytes);
387 // If we don't have enough data (yet) for even the Metacube header, just return.
388 if (pending_data.size() < sizeof(metacube_block_header)) {
392 // Make sure we have the Metacube sync header at the start.
393 // We may need to skip over junk data (it _should_ not happen, though).
394 if (!has_metacube_header) {
395 char *ptr = static_cast<char *>(
396 memmem(pending_data.data(), pending_data.size(),
397 METACUBE_SYNC, strlen(METACUBE_SYNC)));
399 // OK, so we didn't find the sync marker. We know then that
400 // we do not have the _full_ marker in the buffer, but we
401 // could have N-1 bytes. Drop everything before that,
403 drop_pending_data(pending_data.size() - (strlen(METACUBE_SYNC) - 1));
406 // Yay, we found the header. Drop everything (if anything) before it.
407 drop_pending_data(ptr - pending_data.data());
408 has_metacube_header = true;
410 // Re-check that we have the entire header; we could have dropped data.
411 if (pending_data.size() < sizeof(metacube_block_header)) {
417 // Now it's safe to read the header.
418 metacube_block_header *hdr = reinterpret_cast<metacube_block_header *>(pending_data.data());
419 assert(memcmp(hdr->sync, METACUBE_SYNC, sizeof(hdr->sync)) == 0);
420 uint32_t size = ntohl(hdr->size);
421 uint32_t flags = ntohl(hdr->flags);
423 // See if we have the entire block. If not, wait for more data.
424 if (pending_data.size() < sizeof(metacube_block_header) + size) {
428 // Send this block on to the data.
429 char *inner_data = pending_data.data() + sizeof(metacube_block_header);
430 if (flags & METACUBE_FLAGS_HEADER) {
431 string header(inner_data, inner_data + size);
432 servers->set_header(stream_id, http_header + header);
434 servers->add_data(stream_id, inner_data, size);
437 // Consume the block. This isn't the most efficient way of dealing with things
438 // should we have many blocks, but these routines don't need to be too efficient
440 pending_data.erase(pending_data.begin(), pending_data.begin() + sizeof(metacube_block_header) + size);
441 has_metacube_header = false;
445 void HTTPInput::drop_pending_data(size_t num_bytes)
447 if (num_bytes == 0) {
450 fprintf(stderr, "Warning: Dropping %lld junk bytes from stream, maybe it is not a Metacube stream?\n",
451 (long long)num_bytes);
452 pending_data.erase(pending_data.begin(), pending_data.begin() + num_bytes);