6 #include <sys/socket.h>
10 #include <sys/types.h>
11 #include <sys/socket.h>
21 #include "mutexlock.h"
22 #include "httpinput.h"
24 #include "serverpool.h"
31 extern ServerPool *servers;
33 HTTPInput::HTTPInput(const string &stream_id, const string &url)
34 : state(NOT_CONNECTED),
37 has_metacube_header(false),
42 HTTPInput::HTTPInput(const InputProto &serialized)
43 : state(State(serialized.state())),
44 stream_id(serialized.stream_id()),
45 url(serialized.url()),
46 request(serialized.request()),
47 request_bytes_sent(serialized.request_bytes_sent()),
48 response(serialized.response()),
49 http_header(serialized.http_header()),
50 has_metacube_header(serialized.has_metacube_header()),
51 sock(serialized.sock())
53 pending_data.resize(serialized.pending_data().size());
54 memcpy(&pending_data[0], serialized.pending_data().data(), serialized.pending_data().size());
57 parse_url(url, &protocol, &host, &port, &path); // Don't care if it fails.
60 InputProto HTTPInput::serialize() const
62 InputProto serialized;
63 serialized.set_state(state);
64 serialized.set_stream_id(stream_id);
65 serialized.set_url(url);
66 serialized.set_request(request);
67 serialized.set_request_bytes_sent(request_bytes_sent);
68 serialized.set_response(response);
69 serialized.set_http_header(http_header);
70 serialized.set_pending_data(string(pending_data.begin(), pending_data.end()));
71 serialized.set_has_metacube_header(has_metacube_header);
72 serialized.set_sock(sock);
76 int HTTPInput::lookup_and_connect(const string &host, const string &port)
79 int err = getaddrinfo(host.c_str(), port.c_str(), NULL, &ai);
81 fprintf(stderr, "WARNING: Lookup of '%s' failed (%s).\n",
82 host.c_str(), gai_strerror(err));
87 // Connect to everything in turn until we have a socket.
88 while (ai && !should_stop) {
89 int sock = socket(ai->ai_family, SOCK_STREAM, IPPROTO_TCP);
91 // Could be e.g. EPROTONOSUPPORT. The show must go on.
96 err = connect(sock, ai->ai_addr, ai->ai_addrlen);
97 } while (err == -1 && errno == EINTR);
107 // Give the last one as error.
108 fprintf(stderr, "WARNING: Connect to '%s' failed (%s)\n",
109 host.c_str(), strerror(errno));
114 bool HTTPInput::parse_response(const std::string &request)
116 vector<string> lines = split_lines(response);
118 fprintf(stderr, "WARNING: Empty HTTP response from input.\n");
122 vector<string> first_line_tokens = split_tokens(lines[0]);
123 if (first_line_tokens.size() < 2) {
124 fprintf(stderr, "WARNING: Malformed response line '%s' from input.\n",
129 int response = atoi(first_line_tokens[1].c_str());
130 if (response != 200) {
131 fprintf(stderr, "WARNING: Non-200 response '%s' from input.\n",
136 multimap<string, string> parameters;
137 for (size_t i = 1; i < lines.size(); ++i) {
138 size_t split = lines[i].find(":");
139 if (split == string::npos) {
140 fprintf(stderr, "WARNING: Ignoring malformed HTTP response line '%s'\n",
145 string key(lines[i].begin(), lines[i].begin() + split);
147 // Skip any spaces after the colon.
150 } while (split < lines[i].size() && lines[i][split] == ' ');
152 string value(lines[i].begin() + split, lines[i].end());
154 // Remove “Content-encoding: metacube”.
155 // TODO: Make case-insensitive.
156 if (key == "Content-encoding" && value == "metacube") {
160 parameters.insert(make_pair(key, value));
163 // Change “Server: foo” to “Server: metacube/0.1 (reflecting: foo)”
164 // TODO: Make case-insensitive.
165 // XXX: Use a Via: instead?
166 if (parameters.count("Server") == 0) {
167 parameters.insert(make_pair("Server", SERVER_IDENTIFICATION));
169 for (multimap<string, string>::iterator it = parameters.begin();
170 it != parameters.end();
172 if (it->first != "Server") {
175 it->second = SERVER_IDENTIFICATION " (reflecting: " + it->second + ")";
179 // Construct the new HTTP header.
180 http_header = "HTTP/1.0 200 OK\r\n";
181 for (multimap<string, string>::iterator it = parameters.begin();
182 it != parameters.end();
184 http_header.append(it->first + ": " + it->second + "\r\n");
186 http_header.append("\r\n");
187 servers->set_header(stream_id, http_header);
192 void HTTPInput::do_work()
194 while (!should_stop) {
195 if (state == SENDING_REQUEST || state == RECEIVING_HEADER || state == RECEIVING_DATA) {
196 // Since we are non-blocking, we need to wait for the right state first.
197 // Wait up to 50 ms, then check should_stop.
200 pfd.events = (state == SENDING_REQUEST) ? POLLOUT : POLLIN;
201 pfd.events |= POLLRDHUP;
203 int nfds = poll(&pfd, 1, 50);
204 if (nfds == 0 || (nfds == -1 && errno == EINTR)) {
209 state = CLOSING_SOCKET;
216 request_bytes_sent = 0;
218 pending_data.clear();
221 string protocol; // Thrown away.
222 if (!parse_url(url, &protocol, &host, &port, &path)) {
223 fprintf(stderr, "Failed to parse URL '%s'\n", url.c_str());
228 sock = lookup_and_connect(host, port);
230 // Yay, successful connect. Try to set it as nonblocking.
232 if (ioctl(sock, FIONBIO, &one) == -1) {
233 perror("ioctl(FIONBIO)");
234 state = CLOSING_SOCKET;
236 state = SENDING_REQUEST;
237 request = "GET " + path + " HTTP/1.0\r\nUser-Agent: cubemap\r\n\r\n";
238 request_bytes_sent = 0;
242 case SENDING_REQUEST: {
243 size_t to_send = request.size() - request_bytes_sent;
247 ret = write(sock, request.data() + request_bytes_sent, to_send);
248 } while (ret == -1 && errno == EINTR);
252 state = CLOSING_SOCKET;
257 request_bytes_sent += ret;
259 if (request_bytes_sent == request.size()) {
260 state = RECEIVING_HEADER;
264 case RECEIVING_HEADER: {
269 ret = read(sock, buf, sizeof(buf));
270 } while (ret == -1 && errno == EINTR);
274 state = CLOSING_SOCKET;
279 // This really shouldn't happen...
280 fprintf(stderr, "Socket unexpectedly closed while reading header\n");
281 state = CLOSING_SOCKET;
285 RequestParseStatus status = wait_for_double_newline(&response, buf, ret);
287 if (status == RP_OUT_OF_SPACE) {
288 fprintf(stderr, "WARNING: fd %d sent overlong response!\n", sock);
289 state = CLOSING_SOCKET;
291 } else if (status == RP_NOT_FINISHED_YET) {
295 // OK, so we're fine, but there might be some of the actual data after the response.
296 // We'll need to deal with that separately.
298 if (status == RP_EXTRA_DATA) {
299 char *ptr = static_cast<char *>(
300 memmem(response.data(), response.size(), "\r\n\r\n", 4));
302 extra_data = string(ptr, &response[0] + response.size());
303 response.resize(ptr - response.data());
306 if (!parse_response(response)) {
307 state = CLOSING_SOCKET;
311 if (!extra_data.empty()) {
312 process_data(&extra_data[0], extra_data.size());
315 state = RECEIVING_DATA;
318 case RECEIVING_DATA: {
323 ret = read(sock, buf, sizeof(buf));
324 } while (ret == -1 && errno == EINTR);
328 state = CLOSING_SOCKET;
333 // This really shouldn't happen...
334 fprintf(stderr, "Socket unexpectedly closed while reading header\n");
335 state = CLOSING_SOCKET;
339 process_data(buf, ret);
342 case CLOSING_SOCKET: {
346 } while (err == -1 && errno == EINTR);
352 state = NOT_CONNECTED;
359 // If we are still in NOT_CONNECTED, either something went wrong,
360 // or the connection just got closed.
361 // The earlier steps have already given the error message, if any.
362 if (state == NOT_CONNECTED && !should_stop) {
363 fprintf(stderr, "Waiting 0.2 second and restarting...\n");
369 void HTTPInput::process_data(char *ptr, size_t bytes)
371 pending_data.insert(pending_data.end(), ptr, ptr + bytes);
374 // If we don't have enough data (yet) for even the Metacube header, just return.
375 if (pending_data.size() < sizeof(metacube_block_header)) {
379 // Make sure we have the Metacube sync header at the start.
380 // We may need to skip over junk data (it _should_ not happen, though).
381 if (!has_metacube_header) {
382 char *ptr = static_cast<char *>(
383 memmem(pending_data.data(), pending_data.size(),
384 METACUBE_SYNC, strlen(METACUBE_SYNC)));
386 // OK, so we didn't find the sync marker. We know then that
387 // we do not have the _full_ marker in the buffer, but we
388 // could have N-1 bytes. Drop everything before that,
390 drop_pending_data(pending_data.size() - (strlen(METACUBE_SYNC) - 1));
393 // Yay, we found the header. Drop everything (if anything) before it.
394 drop_pending_data(ptr - pending_data.data());
395 has_metacube_header = true;
397 // Re-check that we have the entire header; we could have dropped data.
398 if (pending_data.size() < sizeof(metacube_block_header)) {
404 // Now it's safe to read the header.
405 metacube_block_header *hdr = reinterpret_cast<metacube_block_header *>(pending_data.data());
406 assert(memcmp(hdr->sync, METACUBE_SYNC, sizeof(hdr->sync)) == 0);
407 uint32_t size = ntohl(hdr->size);
408 uint32_t flags = ntohl(hdr->flags);
410 // See if we have the entire block. If not, wait for more data.
411 if (pending_data.size() < sizeof(metacube_block_header) + size) {
415 // Send this block on to the data.
416 char *inner_data = pending_data.data() + sizeof(metacube_block_header);
417 if (flags & METACUBE_FLAGS_HEADER) {
418 string header(inner_data, inner_data + size);
419 servers->set_header(stream_id, http_header + header);
421 servers->add_data(stream_id, inner_data, size);
424 // Consume the block. This isn't the most efficient way of dealing with things
425 // should we have many blocks, but these routines don't need to be too efficient
427 pending_data.erase(pending_data.begin(), pending_data.begin() + sizeof(metacube_block_header) + size);
428 has_metacube_header = false;
432 void HTTPInput::drop_pending_data(size_t num_bytes)
434 if (num_bytes == 0) {
437 fprintf(stderr, "Warning: Dropping %lld junk bytes from stream, maybe it is not a Metacube stream?\n",
438 (long long)num_bytes);
439 pending_data.erase(pending_data.begin(), pending_data.begin() + num_bytes);