4 #include <netinet/in.h>
10 #include <sys/socket.h>
19 #include "httpinput.h"
21 #include "metacube2.h"
22 #include "mutexlock.h"
24 #include "serverpool.h"
32 extern ServerPool *servers;
37 timespec clock_diff(const timespec &a, const timespec &b)
40 ret.tv_sec = b.tv_sec - a.tv_sec;
41 ret.tv_nsec = b.tv_nsec - a.tv_nsec;
42 if (ret.tv_nsec < 0) {
44 ret.tv_nsec += 1000000000;
46 assert(ret.tv_nsec >= 0);
52 HTTPInput::HTTPInput(const string &url)
53 : state(NOT_CONNECTED),
55 has_metacube_header(false),
58 pthread_mutex_init(&stats_mutex, NULL);
60 stats.bytes_received = 0;
61 stats.data_bytes_received = 0;
62 stats.connect_time = -1;
65 HTTPInput::HTTPInput(const InputProto &serialized)
66 : state(State(serialized.state())),
67 url(serialized.url()),
68 request(serialized.request()),
69 request_bytes_sent(serialized.request_bytes_sent()),
70 response(serialized.response()),
71 http_header(serialized.http_header()),
72 stream_header(serialized.stream_header()),
73 has_metacube_header(serialized.has_metacube_header()),
74 sock(serialized.sock())
76 pending_data.resize(serialized.pending_data().size());
77 memcpy(&pending_data[0], serialized.pending_data().data(), serialized.pending_data().size());
80 parse_url(url, &protocol, &host, &port, &path); // Don't care if it fails.
82 pthread_mutex_init(&stats_mutex, NULL);
84 stats.bytes_received = serialized.bytes_received();
85 stats.data_bytes_received = serialized.data_bytes_received();
86 if (serialized.has_connect_time()) {
87 stats.connect_time = serialized.connect_time();
89 stats.connect_time = time(NULL);
93 void HTTPInput::close_socket()
99 MutexLock lock(&stats_mutex);
100 stats.connect_time = -1;
103 InputProto HTTPInput::serialize() const
105 InputProto serialized;
106 serialized.set_state(state);
107 serialized.set_url(url);
108 serialized.set_request(request);
109 serialized.set_request_bytes_sent(request_bytes_sent);
110 serialized.set_response(response);
111 serialized.set_http_header(http_header);
112 serialized.set_stream_header(stream_header);
113 serialized.set_pending_data(string(pending_data.begin(), pending_data.end()));
114 serialized.set_has_metacube_header(has_metacube_header);
115 serialized.set_sock(sock);
116 serialized.set_bytes_received(stats.bytes_received);
117 serialized.set_data_bytes_received(stats.data_bytes_received);
118 serialized.set_connect_time(stats.connect_time);
122 int HTTPInput::lookup_and_connect(const string &host, const string &port)
125 int err = getaddrinfo(host.c_str(), port.c_str(), NULL, &ai);
127 log(WARNING, "[%s] Lookup of '%s' failed (%s).",
128 url.c_str(), host.c_str(), gai_strerror(err));
132 addrinfo *base_ai = ai;
134 // Connect to everything in turn until we have a socket.
135 for ( ; ai && !should_stop(); ai = ai->ai_next) {
136 int sock = socket(ai->ai_family, SOCK_STREAM, IPPROTO_TCP);
138 // Could be e.g. EPROTONOSUPPORT. The show must go on.
142 // Now do a non-blocking connect. This is important because we want to be able to be
143 // woken up, even though it's rather cumbersome.
145 // Set the socket as nonblocking.
147 if (ioctl(sock, FIONBIO, &one) == -1) {
148 log_perror("ioctl(FIONBIO)");
153 // Do a non-blocking connect.
155 err = connect(sock, ai->ai_addr, ai->ai_addrlen);
156 } while (err == -1 && errno == EINTR);
158 if (err == -1 && errno != EINPROGRESS) {
159 log_perror("connect");
164 // Wait for the connect to complete, or an error to happen.
166 bool complete = wait_for_activity(sock, POLLIN | POLLOUT, NULL);
176 // Check whether it ended in an error or not.
177 socklen_t err_size = sizeof(err);
178 if (getsockopt(sock, SOL_SOCKET, SO_ERROR, &err, &err_size) == -1) {
179 log_perror("getsockopt");
187 // Successful connect.
188 freeaddrinfo(base_ai);
195 // Give the last one as error.
196 log(WARNING, "[%s] Connect to '%s' failed (%s)",
197 url.c_str(), host.c_str(), strerror(errno));
198 freeaddrinfo(base_ai);
202 bool HTTPInput::parse_response(const std::string &request)
204 vector<string> lines = split_lines(response);
206 log(WARNING, "[%s] Empty HTTP response from input.", url.c_str());
210 vector<string> first_line_tokens = split_tokens(lines[0]);
211 if (first_line_tokens.size() < 2) {
212 log(WARNING, "[%s] Malformed response line '%s' from input.",
213 url.c_str(), lines[0].c_str());
217 int response = atoi(first_line_tokens[1].c_str());
218 if (response != 200) {
219 log(WARNING, "[%s] Non-200 response '%s' from input.",
220 url.c_str(), lines[0].c_str());
224 multimap<string, string> parameters;
225 for (size_t i = 1; i < lines.size(); ++i) {
226 size_t split = lines[i].find(":");
227 if (split == string::npos) {
228 log(WARNING, "[%s] Ignoring malformed HTTP response line '%s'",
229 url.c_str(), lines[i].c_str());
233 string key(lines[i].begin(), lines[i].begin() + split);
235 // Skip any spaces after the colon.
238 } while (split < lines[i].size() && lines[i][split] == ' ');
240 string value(lines[i].begin() + split, lines[i].end());
242 // Remove “Content-encoding: metacube”.
243 // TODO: Make case-insensitive.
244 if (key == "Content-encoding" && value == "metacube") {
248 parameters.insert(make_pair(key, value));
251 // Change “Server: foo” to “Server: metacube/0.1 (reflecting: foo)”
252 // TODO: Make case-insensitive.
253 // XXX: Use a Via: instead?
254 if (parameters.count("Server") == 0) {
255 parameters.insert(make_pair("Server", SERVER_IDENTIFICATION));
257 for (multimap<string, string>::iterator it = parameters.begin();
258 it != parameters.end();
260 if (it->first != "Server") {
263 it->second = SERVER_IDENTIFICATION " (reflecting: " + it->second + ")";
267 // Set “Connection: close”.
268 // TODO: Make case-insensitive.
269 parameters.erase("Connection");
270 parameters.insert(make_pair("Connection", "close"));
272 // Construct the new HTTP header.
273 http_header = "HTTP/1.0 200 OK\r\n";
274 for (multimap<string, string>::iterator it = parameters.begin();
275 it != parameters.end();
277 http_header.append(it->first + ": " + it->second + "\r\n");
280 for (size_t i = 0; i < stream_indices.size(); ++i) {
281 servers->set_header(stream_indices[i], http_header, stream_header);
287 void HTTPInput::do_work()
289 timespec last_activity;
291 // TODO: Make the timeout persist across restarts.
292 if (state == SENDING_REQUEST || state == RECEIVING_HEADER || state == RECEIVING_DATA) {
293 int err = clock_gettime(CLOCK_MONOTONIC, &last_activity);
297 while (!should_stop()) {
298 if (state == SENDING_REQUEST || state == RECEIVING_HEADER || state == RECEIVING_DATA) {
299 // Give the socket 30 seconds since last activity before we time out.
300 static const int timeout_secs = 30;
303 int err = clock_gettime(CLOCK_MONOTONIC, &now);
306 timespec elapsed = clock_diff(last_activity, now);
307 if (elapsed.tv_sec >= timeout_secs) {
309 log(ERROR, "[%s] Timeout after %d seconds, closing.", url.c_str(), elapsed.tv_sec);
310 state = CLOSING_SOCKET;
314 // Basically calculate (30 - (now - last_activity)) = (30 + (last_activity - now)).
315 // Add a second of slack to account for differences between clocks.
316 timespec timeout = clock_diff(now, last_activity);
317 timeout.tv_sec += timeout_secs + 1;
318 assert(timeout.tv_sec > 0 || (timeout.tv_sec >= 0 && timeout.tv_nsec > 0));
320 bool activity = wait_for_activity(sock, (state == SENDING_REQUEST) ? POLLOUT : POLLIN, &timeout);
322 err = clock_gettime(CLOCK_MONOTONIC, &last_activity);
325 // OK. Most likely, should_stop was set, or we have timed out.
333 request_bytes_sent = 0;
335 pending_data.clear();
336 has_metacube_header = false;
337 for (size_t i = 0; i < stream_indices.size(); ++i) {
338 servers->set_header(stream_indices[i], "", "");
342 string protocol; // Thrown away.
343 if (!parse_url(url, &protocol, &host, &port, &path)) {
344 log(WARNING, "[%s] Failed to parse URL '%s'", url.c_str(), url.c_str());
349 sock = lookup_and_connect(host, port);
351 // Yay, successful connect. Try to set it as nonblocking.
353 if (ioctl(sock, FIONBIO, &one) == -1) {
354 log_perror("ioctl(FIONBIO)");
355 state = CLOSING_SOCKET;
357 state = SENDING_REQUEST;
358 request = "GET " + path + " HTTP/1.0\r\nUser-Agent: cubemap\r\n\r\n";
359 request_bytes_sent = 0;
362 MutexLock lock(&stats_mutex);
363 stats.connect_time = time(NULL);
364 clock_gettime(CLOCK_MONOTONIC, &last_activity);
367 case SENDING_REQUEST: {
368 size_t to_send = request.size() - request_bytes_sent;
372 ret = write(sock, request.data() + request_bytes_sent, to_send);
373 } while (ret == -1 && errno == EINTR);
377 state = CLOSING_SOCKET;
382 request_bytes_sent += ret;
384 if (request_bytes_sent == request.size()) {
385 state = RECEIVING_HEADER;
389 case RECEIVING_HEADER: {
394 ret = read(sock, buf, sizeof(buf));
395 } while (ret == -1 && errno == EINTR);
399 state = CLOSING_SOCKET;
404 // This really shouldn't happen...
405 log(ERROR, "[%s] Socket unexpectedly closed while reading header",
407 state = CLOSING_SOCKET;
411 RequestParseStatus status = wait_for_double_newline(&response, buf, ret);
413 if (status == RP_OUT_OF_SPACE) {
414 log(WARNING, "[%s] Sever sent overlong HTTP response!", url.c_str());
415 state = CLOSING_SOCKET;
417 } else if (status == RP_NOT_FINISHED_YET) {
421 // OK, so we're fine, but there might be some of the actual data after the response.
422 // We'll need to deal with that separately.
424 if (status == RP_EXTRA_DATA) {
425 char *ptr = static_cast<char *>(
426 memmem(response.data(), response.size(), "\r\n\r\n", 4));
428 extra_data = string(ptr + 4, &response[0] + response.size());
429 response.resize(ptr - response.data());
432 if (!parse_response(response)) {
433 state = CLOSING_SOCKET;
437 if (!extra_data.empty()) {
438 process_data(&extra_data[0], extra_data.size());
441 log(INFO, "[%s] Connected to '%s', receiving data.",
442 url.c_str(), url.c_str());
443 state = RECEIVING_DATA;
446 case RECEIVING_DATA: {
451 ret = read(sock, buf, sizeof(buf));
452 } while (ret == -1 && errno == EINTR);
456 state = CLOSING_SOCKET;
461 // This really shouldn't happen...
462 log(ERROR, "[%s] Socket unexpectedly closed while reading data",
464 state = CLOSING_SOCKET;
468 process_data(buf, ret);
471 case CLOSING_SOCKET: {
473 state = NOT_CONNECTED;
480 // If we are still in NOT_CONNECTED, either something went wrong,
481 // or the connection just got closed.
482 // The earlier steps have already given the error message, if any.
483 if (state == NOT_CONNECTED && !should_stop()) {
484 log(INFO, "[%s] Waiting 0.2 second and restarting...", url.c_str());
486 timeout_ts.tv_sec = 0;
487 timeout_ts.tv_nsec = 200000000;
488 wait_for_wakeup(&timeout_ts);
493 void HTTPInput::process_data(char *ptr, size_t bytes)
495 pending_data.insert(pending_data.end(), ptr, ptr + bytes);
497 MutexLock mutex(&stats_mutex);
498 stats.bytes_received += bytes;
502 // If we don't have enough data (yet) for even the Metacube header, just return.
503 if (pending_data.size() < sizeof(metacube2_block_header)) {
507 // Make sure we have the Metacube sync header at the start.
508 // We may need to skip over junk data (it _should_ not happen, though).
509 if (!has_metacube_header) {
510 char *ptr = static_cast<char *>(
511 memmem(pending_data.data(), pending_data.size(),
512 METACUBE2_SYNC, strlen(METACUBE2_SYNC)));
514 // OK, so we didn't find the sync marker. We know then that
515 // we do not have the _full_ marker in the buffer, but we
516 // could have N-1 bytes. Drop everything before that,
518 drop_pending_data(pending_data.size() - (strlen(METACUBE2_SYNC) - 1));
521 // Yay, we found the header. Drop everything (if anything) before it.
522 drop_pending_data(ptr - pending_data.data());
523 has_metacube_header = true;
525 // Re-check that we have the entire header; we could have dropped data.
526 if (pending_data.size() < sizeof(metacube2_block_header)) {
532 // Now it's safe to read the header.
533 metacube2_block_header hdr;
534 memcpy(&hdr, pending_data.data(), sizeof(hdr));
535 assert(memcmp(hdr.sync, METACUBE2_SYNC, sizeof(hdr.sync)) == 0);
536 uint32_t size = ntohl(hdr.size);
537 uint16_t flags = ntohs(hdr.flags);
538 uint16_t expected_csum = metacube2_compute_crc(&hdr);
540 if (expected_csum != ntohs(hdr.csum)) {
541 log(WARNING, "[%s] Metacube checksum failed (expected 0x%x, got 0x%x), "
542 "not reading block claiming to be %d bytes (flags=%x).",
543 url.c_str(), expected_csum, ntohs(hdr.csum),
546 // Drop only the first byte, and let the rest of the code handle resync.
547 pending_data.erase(pending_data.begin(), pending_data.begin() + 1);
548 has_metacube_header = false;
552 log(WARNING, "[%s] Metacube block of %d bytes (flags=%x); corrupted header?",
553 url.c_str(), size, flags);
556 // See if we have the entire block. If not, wait for more data.
557 if (pending_data.size() < sizeof(metacube2_block_header) + size) {
561 // Send this block on to the servers.
563 MutexLock lock(&stats_mutex);
564 stats.data_bytes_received += size;
566 char *inner_data = pending_data.data() + sizeof(metacube2_block_header);
567 if (flags & METACUBE_FLAGS_HEADER) {
568 stream_header = string(inner_data, inner_data + size);
569 for (size_t i = 0; i < stream_indices.size(); ++i) {
570 servers->set_header(stream_indices[i], http_header, stream_header);
573 StreamStartSuitability suitable_for_stream_start;
574 if (flags & METACUBE_FLAGS_NOT_SUITABLE_FOR_STREAM_START) {
575 suitable_for_stream_start = NOT_SUITABLE_FOR_STREAM_START;
577 suitable_for_stream_start = SUITABLE_FOR_STREAM_START;
579 for (size_t i = 0; i < stream_indices.size(); ++i) {
580 servers->add_data(stream_indices[i], inner_data, size, suitable_for_stream_start);
584 // Consume the block. This isn't the most efficient way of dealing with things
585 // should we have many blocks, but these routines don't need to be too efficient
587 pending_data.erase(pending_data.begin(), pending_data.begin() + sizeof(metacube2_block_header) + size);
588 has_metacube_header = false;
592 void HTTPInput::drop_pending_data(size_t num_bytes)
594 if (num_bytes == 0) {
597 log(WARNING, "[%s] Dropping %lld junk bytes from stream, maybe it is not a Metacube2 stream?",
598 url.c_str(), (long long)num_bytes);
599 assert(pending_data.size() >= num_bytes);
600 pending_data.erase(pending_data.begin(), pending_data.begin() + num_bytes);
603 void HTTPInput::add_destination(int stream_index)
605 stream_indices.push_back(stream_index);
606 servers->set_header(stream_index, http_header, stream_header);
609 InputStats HTTPInput::get_stats() const
611 MutexLock lock(&stats_mutex);