4 #include <netinet/in.h>
10 #include <sys/ioctl.h>
11 #include <sys/socket.h>
18 #include "httpinput.h"
22 #include "serverpool.h"
28 extern ServerPool *servers;
30 HTTPInput::HTTPInput(const string &url)
31 : state(NOT_CONNECTED),
33 has_metacube_header(false),
38 HTTPInput::HTTPInput(const InputProto &serialized)
39 : state(State(serialized.state())),
40 url(serialized.url()),
41 request(serialized.request()),
42 request_bytes_sent(serialized.request_bytes_sent()),
43 response(serialized.response()),
44 http_header(serialized.http_header()),
45 has_metacube_header(serialized.has_metacube_header()),
46 sock(serialized.sock())
48 pending_data.resize(serialized.pending_data().size());
49 memcpy(&pending_data[0], serialized.pending_data().data(), serialized.pending_data().size());
52 parse_url(url, &protocol, &host, &port, &path); // Don't care if it fails.
54 // Older versions stored the extra \r\n in the HTTP header.
55 // Strip it if we find it.
56 if (http_header.size() >= 4 &&
57 memcmp(http_header.data() + http_header.size() - 4, "\r\n\r\n", 4) == 0) {
58 http_header.resize(http_header.size() - 2);
62 void HTTPInput::close_socket()
67 } while (ret == -1 && errno == EINTR);
70 log_perror("close()");
74 InputProto HTTPInput::serialize() const
76 InputProto serialized;
77 serialized.set_state(state);
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 log(WARNING, "[%s] Lookup of '%s' failed (%s).",
95 url.c_str(), host.c_str(), gai_strerror(err));
100 addrinfo *base_ai = ai;
102 // Connect to everything in turn until we have a socket.
103 while (ai && !should_stop) {
104 int sock = socket(ai->ai_family, SOCK_STREAM, IPPROTO_TCP);
106 // Could be e.g. EPROTONOSUPPORT. The show must go on.
111 err = connect(sock, ai->ai_addr, ai->ai_addrlen);
112 } while (err == -1 && errno == EINTR);
115 freeaddrinfo(base_ai);
121 } while (err == -1 && errno == EINTR);
125 // Can still continue.
131 // Give the last one as error.
132 log(WARNING, "[%s] Connect to '%s' failed (%s)",
133 url.c_str(), host.c_str(), strerror(errno));
134 freeaddrinfo(base_ai);
138 bool HTTPInput::parse_response(const std::string &request)
140 vector<string> lines = split_lines(response);
142 log(WARNING, "[%s] Empty HTTP response from input.", url.c_str());
146 vector<string> first_line_tokens = split_tokens(lines[0]);
147 if (first_line_tokens.size() < 2) {
148 log(WARNING, "[%s] Malformed response line '%s' from input.",
149 url.c_str(), lines[0].c_str());
153 int response = atoi(first_line_tokens[1].c_str());
154 if (response != 200) {
155 log(WARNING, "[%s] Non-200 response '%s' from input.",
156 url.c_str(), lines[0].c_str());
160 multimap<string, string> parameters;
161 for (size_t i = 1; i < lines.size(); ++i) {
162 size_t split = lines[i].find(":");
163 if (split == string::npos) {
164 log(WARNING, "[%s] Ignoring malformed HTTP response line '%s'",
165 url.c_str(), lines[i].c_str());
169 string key(lines[i].begin(), lines[i].begin() + split);
171 // Skip any spaces after the colon.
174 } while (split < lines[i].size() && lines[i][split] == ' ');
176 string value(lines[i].begin() + split, lines[i].end());
178 // Remove “Content-encoding: metacube”.
179 // TODO: Make case-insensitive.
180 if (key == "Content-encoding" && value == "metacube") {
184 parameters.insert(make_pair(key, value));
187 // Change “Server: foo” to “Server: metacube/0.1 (reflecting: foo)”
188 // TODO: Make case-insensitive.
189 // XXX: Use a Via: instead?
190 if (parameters.count("Server") == 0) {
191 parameters.insert(make_pair("Server", SERVER_IDENTIFICATION));
193 for (multimap<string, string>::iterator it = parameters.begin();
194 it != parameters.end();
196 if (it->first != "Server") {
199 it->second = SERVER_IDENTIFICATION " (reflecting: " + it->second + ")";
203 // Construct the new HTTP header.
204 http_header = "HTTP/1.0 200 OK\r\n";
205 for (multimap<string, string>::iterator it = parameters.begin();
206 it != parameters.end();
208 http_header.append(it->first + ": " + it->second + "\r\n");
211 for (size_t i = 0; i < stream_ids.size(); ++i) {
212 servers->set_header(stream_ids[i], http_header, "");
218 void HTTPInput::do_work()
220 while (!should_stop) {
221 if (state == SENDING_REQUEST || state == RECEIVING_HEADER || state == RECEIVING_DATA) {
222 // Since we are non-blocking, we need to wait for the right state first.
223 // Wait up to 50 ms, then check should_stop.
226 pfd.events = (state == SENDING_REQUEST) ? POLLOUT : POLLIN;
227 pfd.events |= POLLRDHUP;
229 int nfds = poll(&pfd, 1, 50);
230 if (nfds == 0 || (nfds == -1 && errno == EINTR)) {
235 state = CLOSING_SOCKET;
242 request_bytes_sent = 0;
244 pending_data.clear();
245 for (size_t i = 0; i < stream_ids.size(); ++i) {
246 servers->set_header(stream_ids[i], "", "");
250 string protocol; // Thrown away.
251 if (!parse_url(url, &protocol, &host, &port, &path)) {
252 log(WARNING, "[%s] Failed to parse URL '%s'", url.c_str(), url.c_str());
257 sock = lookup_and_connect(host, port);
259 // Yay, successful connect. Try to set it as nonblocking.
261 if (ioctl(sock, FIONBIO, &one) == -1) {
262 log_perror("ioctl(FIONBIO)");
263 state = CLOSING_SOCKET;
265 state = SENDING_REQUEST;
266 request = "GET " + path + " HTTP/1.0\r\nUser-Agent: cubemap\r\n\r\n";
267 request_bytes_sent = 0;
271 case SENDING_REQUEST: {
272 size_t to_send = request.size() - request_bytes_sent;
276 ret = write(sock, request.data() + request_bytes_sent, to_send);
277 } while (ret == -1 && errno == EINTR);
281 state = CLOSING_SOCKET;
286 request_bytes_sent += ret;
288 if (request_bytes_sent == request.size()) {
289 state = RECEIVING_HEADER;
293 case RECEIVING_HEADER: {
298 ret = read(sock, buf, sizeof(buf));
299 } while (ret == -1 && errno == EINTR);
303 state = CLOSING_SOCKET;
308 // This really shouldn't happen...
309 log(ERROR, "[%s] Socket unexpectedly closed while reading header",
311 state = CLOSING_SOCKET;
315 RequestParseStatus status = wait_for_double_newline(&response, buf, ret);
317 if (status == RP_OUT_OF_SPACE) {
318 log(WARNING, "[%s] Sever sent overlong HTTP response!", url.c_str());
319 state = CLOSING_SOCKET;
321 } else if (status == RP_NOT_FINISHED_YET) {
325 // OK, so we're fine, but there might be some of the actual data after the response.
326 // We'll need to deal with that separately.
328 if (status == RP_EXTRA_DATA) {
329 char *ptr = static_cast<char *>(
330 memmem(response.data(), response.size(), "\r\n\r\n", 4));
332 extra_data = string(ptr, &response[0] + response.size());
333 response.resize(ptr - response.data());
336 if (!parse_response(response)) {
337 state = CLOSING_SOCKET;
341 if (!extra_data.empty()) {
342 process_data(&extra_data[0], extra_data.size());
345 log(INFO, "[%s] Connected to '%s', receiving data.",
346 url.c_str(), url.c_str());
347 state = RECEIVING_DATA;
350 case RECEIVING_DATA: {
355 ret = read(sock, buf, sizeof(buf));
356 } while (ret == -1 && errno == EINTR);
360 state = CLOSING_SOCKET;
365 // This really shouldn't happen...
366 log(ERROR, "[%s] Socket unexpectedly closed while reading header",
368 state = CLOSING_SOCKET;
372 process_data(buf, ret);
375 case CLOSING_SOCKET: {
379 } while (err == -1 && errno == EINTR);
385 state = NOT_CONNECTED;
392 // If we are still in NOT_CONNECTED, either something went wrong,
393 // or the connection just got closed.
394 // The earlier steps have already given the error message, if any.
395 if (state == NOT_CONNECTED && !should_stop) {
396 log(INFO, "[%s] Waiting 0.2 second and restarting...", url.c_str());
402 void HTTPInput::process_data(char *ptr, size_t bytes)
404 pending_data.insert(pending_data.end(), ptr, ptr + bytes);
407 // If we don't have enough data (yet) for even the Metacube header, just return.
408 if (pending_data.size() < sizeof(metacube_block_header)) {
412 // Make sure we have the Metacube sync header at the start.
413 // We may need to skip over junk data (it _should_ not happen, though).
414 if (!has_metacube_header) {
415 char *ptr = static_cast<char *>(
416 memmem(pending_data.data(), pending_data.size(),
417 METACUBE_SYNC, strlen(METACUBE_SYNC)));
419 // OK, so we didn't find the sync marker. We know then that
420 // we do not have the _full_ marker in the buffer, but we
421 // could have N-1 bytes. Drop everything before that,
423 drop_pending_data(pending_data.size() - (strlen(METACUBE_SYNC) - 1));
426 // Yay, we found the header. Drop everything (if anything) before it.
427 drop_pending_data(ptr - pending_data.data());
428 has_metacube_header = true;
430 // Re-check that we have the entire header; we could have dropped data.
431 if (pending_data.size() < sizeof(metacube_block_header)) {
437 // Now it's safe to read the header.
438 metacube_block_header *hdr = reinterpret_cast<metacube_block_header *>(pending_data.data());
439 assert(memcmp(hdr->sync, METACUBE_SYNC, sizeof(hdr->sync)) == 0);
440 uint32_t size = ntohl(hdr->size);
441 uint32_t flags = ntohl(hdr->flags);
443 // See if we have the entire block. If not, wait for more data.
444 if (pending_data.size() < sizeof(metacube_block_header) + size) {
448 // Send this block on to the data.
449 char *inner_data = pending_data.data() + sizeof(metacube_block_header);
450 if (flags & METACUBE_FLAGS_HEADER) {
451 string header(inner_data, inner_data + size);
452 for (size_t i = 0; i < stream_ids.size(); ++i) {
453 servers->set_header(stream_ids[i], http_header, header);
456 for (size_t i = 0; i < stream_ids.size(); ++i) {
457 servers->add_data(stream_ids[i], inner_data, size);
461 // Consume the block. This isn't the most efficient way of dealing with things
462 // should we have many blocks, but these routines don't need to be too efficient
464 pending_data.erase(pending_data.begin(), pending_data.begin() + sizeof(metacube_block_header) + size);
465 has_metacube_header = false;
469 void HTTPInput::drop_pending_data(size_t num_bytes)
471 if (num_bytes == 0) {
474 log(WARNING, "[%s] Dropping %lld junk bytes from stream, maybe it is not a Metacube stream?",
475 url.c_str(), (long long)num_bytes);
476 pending_data.erase(pending_data.begin(), pending_data.begin() + num_bytes);