4 #include <netinet/in.h>
10 #include <sys/socket.h>
17 #include "httpinput.h"
21 #include "serverpool.h"
27 extern ServerPool *servers;
29 HTTPInput::HTTPInput(const string &url)
30 : state(NOT_CONNECTED),
32 has_metacube_header(false),
37 HTTPInput::HTTPInput(const InputProto &serialized)
38 : state(State(serialized.state())),
39 url(serialized.url()),
40 request(serialized.request()),
41 request_bytes_sent(serialized.request_bytes_sent()),
42 response(serialized.response()),
43 http_header(serialized.http_header()),
44 has_metacube_header(serialized.has_metacube_header()),
45 sock(serialized.sock())
47 pending_data.resize(serialized.pending_data().size());
48 memcpy(&pending_data[0], serialized.pending_data().data(), serialized.pending_data().size());
51 parse_url(url, &protocol, &host, &port, &path); // Don't care if it fails.
53 // Older versions stored the extra \r\n in the HTTP header.
54 // Strip it if we find it.
55 if (http_header.size() >= 4 &&
56 memcmp(http_header.data() + http_header.size() - 4, "\r\n\r\n", 4) == 0) {
57 http_header.resize(http_header.size() - 2);
61 void HTTPInput::close_socket()
66 } while (ret == -1 && errno == EINTR);
69 log_perror("close()");
73 InputProto HTTPInput::serialize() const
75 InputProto serialized;
76 serialized.set_state(state);
77 serialized.set_url(url);
78 serialized.set_request(request);
79 serialized.set_request_bytes_sent(request_bytes_sent);
80 serialized.set_response(response);
81 serialized.set_http_header(http_header);
82 serialized.set_pending_data(string(pending_data.begin(), pending_data.end()));
83 serialized.set_has_metacube_header(has_metacube_header);
84 serialized.set_sock(sock);
88 int HTTPInput::lookup_and_connect(const string &host, const string &port)
91 int err = getaddrinfo(host.c_str(), port.c_str(), NULL, &ai);
93 log(WARNING, "[%s] Lookup of '%s' failed (%s).",
94 url.c_str(), host.c_str(), gai_strerror(err));
99 addrinfo *base_ai = ai;
101 // Connect to everything in turn until we have a socket.
102 while (ai && !should_stop) {
103 int sock = socket(ai->ai_family, SOCK_STREAM, IPPROTO_TCP);
105 // Could be e.g. EPROTONOSUPPORT. The show must go on.
110 err = connect(sock, ai->ai_addr, ai->ai_addrlen);
111 } while (err == -1 && errno == EINTR);
114 freeaddrinfo(base_ai);
120 } while (err == -1 && errno == EINTR);
124 // Can still continue.
130 // Give the last one as error.
131 log(WARNING, "[%s] Connect to '%s' failed (%s)",
132 url.c_str(), host.c_str(), strerror(errno));
133 freeaddrinfo(base_ai);
137 bool HTTPInput::parse_response(const std::string &request)
139 vector<string> lines = split_lines(response);
141 log(WARNING, "[%s] Empty HTTP response from input.", url.c_str());
145 vector<string> first_line_tokens = split_tokens(lines[0]);
146 if (first_line_tokens.size() < 2) {
147 log(WARNING, "[%s] Malformed response line '%s' from input.",
148 url.c_str(), lines[0].c_str());
152 int response = atoi(first_line_tokens[1].c_str());
153 if (response != 200) {
154 log(WARNING, "[%s] Non-200 response '%s' from input.",
155 url.c_str(), lines[0].c_str());
159 multimap<string, string> parameters;
160 for (size_t i = 1; i < lines.size(); ++i) {
161 size_t split = lines[i].find(":");
162 if (split == string::npos) {
163 log(WARNING, "[%s] Ignoring malformed HTTP response line '%s'",
164 url.c_str(), lines[i].c_str());
168 string key(lines[i].begin(), lines[i].begin() + split);
170 // Skip any spaces after the colon.
173 } while (split < lines[i].size() && lines[i][split] == ' ');
175 string value(lines[i].begin() + split, lines[i].end());
177 // Remove “Content-encoding: metacube”.
178 // TODO: Make case-insensitive.
179 if (key == "Content-encoding" && value == "metacube") {
183 parameters.insert(make_pair(key, value));
186 // Change “Server: foo” to “Server: metacube/0.1 (reflecting: foo)”
187 // TODO: Make case-insensitive.
188 // XXX: Use a Via: instead?
189 if (parameters.count("Server") == 0) {
190 parameters.insert(make_pair("Server", SERVER_IDENTIFICATION));
192 for (multimap<string, string>::iterator it = parameters.begin();
193 it != parameters.end();
195 if (it->first != "Server") {
198 it->second = SERVER_IDENTIFICATION " (reflecting: " + it->second + ")";
202 // Set “Connection: close”.
203 // TODO: Make case-insensitive.
204 parameters.erase("Connection");
205 parameters.insert(make_pair("Connection", "close"));
207 // Construct the new HTTP header.
208 http_header = "HTTP/1.0 200 OK\r\n";
209 for (multimap<string, string>::iterator it = parameters.begin();
210 it != parameters.end();
212 http_header.append(it->first + ": " + it->second + "\r\n");
215 for (size_t i = 0; i < stream_ids.size(); ++i) {
216 servers->set_header(stream_ids[i], http_header, "");
222 void HTTPInput::do_work()
224 while (!should_stop) {
225 if (state == SENDING_REQUEST || state == RECEIVING_HEADER || state == RECEIVING_DATA) {
226 // Since we are non-blocking, we need to wait for the right state first.
227 // Wait up to 50 ms, then check should_stop.
230 pfd.events = (state == SENDING_REQUEST) ? POLLOUT : POLLIN;
231 pfd.events |= POLLRDHUP;
233 int nfds = poll(&pfd, 1, 50);
234 if (nfds == 0 || (nfds == -1 && errno == EINTR)) {
239 state = CLOSING_SOCKET;
246 request_bytes_sent = 0;
248 pending_data.clear();
249 for (size_t i = 0; i < stream_ids.size(); ++i) {
250 servers->set_header(stream_ids[i], "", "");
254 string protocol; // Thrown away.
255 if (!parse_url(url, &protocol, &host, &port, &path)) {
256 log(WARNING, "[%s] Failed to parse URL '%s'", url.c_str(), url.c_str());
261 sock = lookup_and_connect(host, port);
263 // Yay, successful connect. Try to set it as nonblocking.
265 if (ioctl(sock, FIONBIO, &one) == -1) {
266 log_perror("ioctl(FIONBIO)");
267 state = CLOSING_SOCKET;
269 state = SENDING_REQUEST;
270 request = "GET " + path + " HTTP/1.0\r\nUser-Agent: cubemap\r\n\r\n";
271 request_bytes_sent = 0;
275 case SENDING_REQUEST: {
276 size_t to_send = request.size() - request_bytes_sent;
280 ret = write(sock, request.data() + request_bytes_sent, to_send);
281 } while (ret == -1 && errno == EINTR);
285 state = CLOSING_SOCKET;
290 request_bytes_sent += ret;
292 if (request_bytes_sent == request.size()) {
293 state = RECEIVING_HEADER;
297 case RECEIVING_HEADER: {
302 ret = read(sock, buf, sizeof(buf));
303 } while (ret == -1 && errno == EINTR);
307 state = CLOSING_SOCKET;
312 // This really shouldn't happen...
313 log(ERROR, "[%s] Socket unexpectedly closed while reading header",
315 state = CLOSING_SOCKET;
319 RequestParseStatus status = wait_for_double_newline(&response, buf, ret);
321 if (status == RP_OUT_OF_SPACE) {
322 log(WARNING, "[%s] Sever sent overlong HTTP response!", url.c_str());
323 state = CLOSING_SOCKET;
325 } else if (status == RP_NOT_FINISHED_YET) {
329 // OK, so we're fine, but there might be some of the actual data after the response.
330 // We'll need to deal with that separately.
332 if (status == RP_EXTRA_DATA) {
333 char *ptr = static_cast<char *>(
334 memmem(response.data(), response.size(), "\r\n\r\n", 4));
336 extra_data = string(ptr, &response[0] + response.size());
337 response.resize(ptr - response.data());
340 if (!parse_response(response)) {
341 state = CLOSING_SOCKET;
345 if (!extra_data.empty()) {
346 process_data(&extra_data[0], extra_data.size());
349 log(INFO, "[%s] Connected to '%s', receiving data.",
350 url.c_str(), url.c_str());
351 state = RECEIVING_DATA;
354 case RECEIVING_DATA: {
359 ret = read(sock, buf, sizeof(buf));
360 } while (ret == -1 && errno == EINTR);
364 state = CLOSING_SOCKET;
369 // This really shouldn't happen...
370 log(ERROR, "[%s] Socket unexpectedly closed while reading header",
372 state = CLOSING_SOCKET;
376 process_data(buf, ret);
379 case CLOSING_SOCKET: {
383 } while (err == -1 && errno == EINTR);
389 state = NOT_CONNECTED;
396 // If we are still in NOT_CONNECTED, either something went wrong,
397 // or the connection just got closed.
398 // The earlier steps have already given the error message, if any.
399 if (state == NOT_CONNECTED && !should_stop) {
400 log(INFO, "[%s] Waiting 0.2 second and restarting...", url.c_str());
406 void HTTPInput::process_data(char *ptr, size_t bytes)
408 pending_data.insert(pending_data.end(), ptr, ptr + bytes);
411 // If we don't have enough data (yet) for even the Metacube header, just return.
412 if (pending_data.size() < sizeof(metacube_block_header)) {
416 // Make sure we have the Metacube sync header at the start.
417 // We may need to skip over junk data (it _should_ not happen, though).
418 if (!has_metacube_header) {
419 char *ptr = static_cast<char *>(
420 memmem(pending_data.data(), pending_data.size(),
421 METACUBE_SYNC, strlen(METACUBE_SYNC)));
423 // OK, so we didn't find the sync marker. We know then that
424 // we do not have the _full_ marker in the buffer, but we
425 // could have N-1 bytes. Drop everything before that,
427 drop_pending_data(pending_data.size() - (strlen(METACUBE_SYNC) - 1));
430 // Yay, we found the header. Drop everything (if anything) before it.
431 drop_pending_data(ptr - pending_data.data());
432 has_metacube_header = true;
434 // Re-check that we have the entire header; we could have dropped data.
435 if (pending_data.size() < sizeof(metacube_block_header)) {
441 // Now it's safe to read the header.
442 metacube_block_header *hdr = reinterpret_cast<metacube_block_header *>(pending_data.data());
443 assert(memcmp(hdr->sync, METACUBE_SYNC, sizeof(hdr->sync)) == 0);
444 uint32_t size = ntohl(hdr->size);
445 uint32_t flags = ntohl(hdr->flags);
447 // See if we have the entire block. If not, wait for more data.
448 if (pending_data.size() < sizeof(metacube_block_header) + size) {
452 // Send this block on to the data.
453 char *inner_data = pending_data.data() + sizeof(metacube_block_header);
454 if (flags & METACUBE_FLAGS_HEADER) {
455 string header(inner_data, inner_data + size);
456 for (size_t i = 0; i < stream_ids.size(); ++i) {
457 servers->set_header(stream_ids[i], http_header, header);
460 for (size_t i = 0; i < stream_ids.size(); ++i) {
461 servers->add_data(stream_ids[i], inner_data, size);
465 // Consume the block. This isn't the most efficient way of dealing with things
466 // should we have many blocks, but these routines don't need to be too efficient
468 pending_data.erase(pending_data.begin(), pending_data.begin() + sizeof(metacube_block_header) + size);
469 has_metacube_header = false;
473 void HTTPInput::drop_pending_data(size_t num_bytes)
475 if (num_bytes == 0) {
478 log(WARNING, "[%s] Dropping %lld junk bytes from stream, maybe it is not a Metacube stream?",
479 url.c_str(), (long long)num_bytes);
480 pending_data.erase(pending_data.begin(), pending_data.begin() + num_bytes);