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);
119 } while (err == -1 && errno == EINTR);
123 // Can still continue.
129 // Give the last one as error.
130 fprintf(stderr, "WARNING: Connect to '%s' failed (%s)\n",
131 host.c_str(), strerror(errno));
136 bool HTTPInput::parse_response(const std::string &request)
138 vector<string> lines = split_lines(response);
140 fprintf(stderr, "WARNING: Empty HTTP response from input.\n");
144 vector<string> first_line_tokens = split_tokens(lines[0]);
145 if (first_line_tokens.size() < 2) {
146 fprintf(stderr, "WARNING: Malformed response line '%s' from input.\n",
151 int response = atoi(first_line_tokens[1].c_str());
152 if (response != 200) {
153 fprintf(stderr, "WARNING: Non-200 response '%s' from input.\n",
158 multimap<string, string> parameters;
159 for (size_t i = 1; i < lines.size(); ++i) {
160 size_t split = lines[i].find(":");
161 if (split == string::npos) {
162 fprintf(stderr, "WARNING: Ignoring malformed HTTP response line '%s'\n",
167 string key(lines[i].begin(), lines[i].begin() + split);
169 // Skip any spaces after the colon.
172 } while (split < lines[i].size() && lines[i][split] == ' ');
174 string value(lines[i].begin() + split, lines[i].end());
176 // Remove “Content-encoding: metacube”.
177 // TODO: Make case-insensitive.
178 if (key == "Content-encoding" && value == "metacube") {
182 parameters.insert(make_pair(key, value));
185 // Change “Server: foo” to “Server: metacube/0.1 (reflecting: foo)”
186 // TODO: Make case-insensitive.
187 // XXX: Use a Via: instead?
188 if (parameters.count("Server") == 0) {
189 parameters.insert(make_pair("Server", SERVER_IDENTIFICATION));
191 for (multimap<string, string>::iterator it = parameters.begin();
192 it != parameters.end();
194 if (it->first != "Server") {
197 it->second = SERVER_IDENTIFICATION " (reflecting: " + it->second + ")";
201 // Construct the new HTTP header.
202 http_header = "HTTP/1.0 200 OK\r\n";
203 for (multimap<string, string>::iterator it = parameters.begin();
204 it != parameters.end();
206 http_header.append(it->first + ": " + it->second + "\r\n");
208 http_header.append("\r\n");
209 servers->set_header(stream_id, http_header);
214 void HTTPInput::do_work()
216 while (!should_stop) {
217 if (state == SENDING_REQUEST || state == RECEIVING_HEADER || state == RECEIVING_DATA) {
218 // Since we are non-blocking, we need to wait for the right state first.
219 // Wait up to 50 ms, then check should_stop.
222 pfd.events = (state == SENDING_REQUEST) ? POLLOUT : POLLIN;
223 pfd.events |= POLLRDHUP;
225 int nfds = poll(&pfd, 1, 50);
226 if (nfds == 0 || (nfds == -1 && errno == EINTR)) {
231 state = CLOSING_SOCKET;
238 request_bytes_sent = 0;
240 pending_data.clear();
243 string protocol; // Thrown away.
244 if (!parse_url(url, &protocol, &host, &port, &path)) {
245 fprintf(stderr, "Failed to parse URL '%s'\n", url.c_str());
250 sock = lookup_and_connect(host, port);
252 // Yay, successful connect. Try to set it as nonblocking.
254 if (ioctl(sock, FIONBIO, &one) == -1) {
255 perror("ioctl(FIONBIO)");
256 state = CLOSING_SOCKET;
258 state = SENDING_REQUEST;
259 request = "GET " + path + " HTTP/1.0\r\nUser-Agent: cubemap\r\n\r\n";
260 request_bytes_sent = 0;
264 case SENDING_REQUEST: {
265 size_t to_send = request.size() - request_bytes_sent;
269 ret = write(sock, request.data() + request_bytes_sent, to_send);
270 } while (ret == -1 && errno == EINTR);
274 state = CLOSING_SOCKET;
279 request_bytes_sent += ret;
281 if (request_bytes_sent == request.size()) {
282 state = RECEIVING_HEADER;
286 case RECEIVING_HEADER: {
291 ret = read(sock, buf, sizeof(buf));
292 } while (ret == -1 && errno == EINTR);
296 state = CLOSING_SOCKET;
301 // This really shouldn't happen...
302 fprintf(stderr, "Socket unexpectedly closed while reading header\n");
303 state = CLOSING_SOCKET;
307 RequestParseStatus status = wait_for_double_newline(&response, buf, ret);
309 if (status == RP_OUT_OF_SPACE) {
310 fprintf(stderr, "WARNING: fd %d sent overlong response!\n", sock);
311 state = CLOSING_SOCKET;
313 } else if (status == RP_NOT_FINISHED_YET) {
317 // OK, so we're fine, but there might be some of the actual data after the response.
318 // We'll need to deal with that separately.
320 if (status == RP_EXTRA_DATA) {
321 char *ptr = static_cast<char *>(
322 memmem(response.data(), response.size(), "\r\n\r\n", 4));
324 extra_data = string(ptr, &response[0] + response.size());
325 response.resize(ptr - response.data());
328 if (!parse_response(response)) {
329 state = CLOSING_SOCKET;
333 if (!extra_data.empty()) {
334 process_data(&extra_data[0], extra_data.size());
337 state = RECEIVING_DATA;
340 case RECEIVING_DATA: {
345 ret = read(sock, buf, sizeof(buf));
346 } while (ret == -1 && errno == EINTR);
350 state = CLOSING_SOCKET;
355 // This really shouldn't happen...
356 fprintf(stderr, "Socket unexpectedly closed while reading header\n");
357 state = CLOSING_SOCKET;
361 process_data(buf, ret);
364 case CLOSING_SOCKET: {
368 } while (err == -1 && errno == EINTR);
374 state = NOT_CONNECTED;
381 // If we are still in NOT_CONNECTED, either something went wrong,
382 // or the connection just got closed.
383 // The earlier steps have already given the error message, if any.
384 if (state == NOT_CONNECTED && !should_stop) {
385 fprintf(stderr, "Waiting 0.2 second and restarting...\n");
391 void HTTPInput::process_data(char *ptr, size_t bytes)
393 pending_data.insert(pending_data.end(), ptr, ptr + bytes);
396 // If we don't have enough data (yet) for even the Metacube header, just return.
397 if (pending_data.size() < sizeof(metacube_block_header)) {
401 // Make sure we have the Metacube sync header at the start.
402 // We may need to skip over junk data (it _should_ not happen, though).
403 if (!has_metacube_header) {
404 char *ptr = static_cast<char *>(
405 memmem(pending_data.data(), pending_data.size(),
406 METACUBE_SYNC, strlen(METACUBE_SYNC)));
408 // OK, so we didn't find the sync marker. We know then that
409 // we do not have the _full_ marker in the buffer, but we
410 // could have N-1 bytes. Drop everything before that,
412 drop_pending_data(pending_data.size() - (strlen(METACUBE_SYNC) - 1));
415 // Yay, we found the header. Drop everything (if anything) before it.
416 drop_pending_data(ptr - pending_data.data());
417 has_metacube_header = true;
419 // Re-check that we have the entire header; we could have dropped data.
420 if (pending_data.size() < sizeof(metacube_block_header)) {
426 // Now it's safe to read the header.
427 metacube_block_header *hdr = reinterpret_cast<metacube_block_header *>(pending_data.data());
428 assert(memcmp(hdr->sync, METACUBE_SYNC, sizeof(hdr->sync)) == 0);
429 uint32_t size = ntohl(hdr->size);
430 uint32_t flags = ntohl(hdr->flags);
432 // See if we have the entire block. If not, wait for more data.
433 if (pending_data.size() < sizeof(metacube_block_header) + size) {
437 // Send this block on to the data.
438 char *inner_data = pending_data.data() + sizeof(metacube_block_header);
439 if (flags & METACUBE_FLAGS_HEADER) {
440 string header(inner_data, inner_data + size);
441 servers->set_header(stream_id, http_header + header);
443 servers->add_data(stream_id, inner_data, size);
446 // Consume the block. This isn't the most efficient way of dealing with things
447 // should we have many blocks, but these routines don't need to be too efficient
449 pending_data.erase(pending_data.begin(), pending_data.begin() + sizeof(metacube_block_header) + size);
450 has_metacube_header = false;
454 void HTTPInput::drop_pending_data(size_t num_bytes)
456 if (num_bytes == 0) {
459 fprintf(stderr, "Warning: Dropping %lld junk bytes from stream, maybe it is not a Metacube stream?\n",
460 (long long)num_bytes);
461 pending_data.erase(pending_data.begin(), pending_data.begin() + num_bytes);