4 #include <netinet/in.h>
10 #include <sys/ioctl.h>
11 #include <sys/socket.h>
18 #include "httpinput.h"
21 #include "serverpool.h"
27 extern ServerPool *servers;
29 HTTPInput::HTTPInput(const string &stream_id, const string &url)
30 : state(NOT_CONNECTED),
33 has_metacube_header(false),
38 HTTPInput::HTTPInput(const InputProto &serialized)
39 : state(State(serialized.state())),
40 stream_id(serialized.stream_id()),
41 url(serialized.url()),
42 request(serialized.request()),
43 request_bytes_sent(serialized.request_bytes_sent()),
44 response(serialized.response()),
45 http_header(serialized.http_header()),
46 has_metacube_header(serialized.has_metacube_header()),
47 sock(serialized.sock())
49 pending_data.resize(serialized.pending_data().size());
50 memcpy(&pending_data[0], serialized.pending_data().data(), serialized.pending_data().size());
53 parse_url(url, &protocol, &host, &port, &path); // Don't care if it fails.
56 void HTTPInput::close_socket()
61 } while (ret == -1 && errno == EINTR);
68 InputProto HTTPInput::serialize() const
70 InputProto serialized;
71 serialized.set_state(state);
72 serialized.set_stream_id(stream_id);
73 serialized.set_url(url);
74 serialized.set_request(request);
75 serialized.set_request_bytes_sent(request_bytes_sent);
76 serialized.set_response(response);
77 serialized.set_http_header(http_header);
78 serialized.set_pending_data(string(pending_data.begin(), pending_data.end()));
79 serialized.set_has_metacube_header(has_metacube_header);
80 serialized.set_sock(sock);
84 int HTTPInput::lookup_and_connect(const string &host, const string &port)
87 int err = getaddrinfo(host.c_str(), port.c_str(), NULL, &ai);
89 fprintf(stderr, "WARNING: Lookup of '%s' failed (%s).\n",
90 host.c_str(), gai_strerror(err));
95 // Connect to everything in turn until we have a socket.
96 while (ai && !should_stop) {
97 int sock = socket(ai->ai_family, SOCK_STREAM, IPPROTO_TCP);
99 // Could be e.g. EPROTONOSUPPORT. The show must go on.
104 err = connect(sock, ai->ai_addr, ai->ai_addrlen);
105 } while (err == -1 && errno == EINTR);
114 } while (err == -1 && errno == EINTR);
118 // Can still continue.
124 // Give the last one as error.
125 fprintf(stderr, "WARNING: Connect to '%s' failed (%s)\n",
126 host.c_str(), strerror(errno));
131 bool HTTPInput::parse_response(const std::string &request)
133 vector<string> lines = split_lines(response);
135 fprintf(stderr, "WARNING: Empty HTTP response from input.\n");
139 vector<string> first_line_tokens = split_tokens(lines[0]);
140 if (first_line_tokens.size() < 2) {
141 fprintf(stderr, "WARNING: Malformed response line '%s' from input.\n",
146 int response = atoi(first_line_tokens[1].c_str());
147 if (response != 200) {
148 fprintf(stderr, "WARNING: Non-200 response '%s' from input.\n",
153 multimap<string, string> parameters;
154 for (size_t i = 1; i < lines.size(); ++i) {
155 size_t split = lines[i].find(":");
156 if (split == string::npos) {
157 fprintf(stderr, "WARNING: Ignoring malformed HTTP response line '%s'\n",
162 string key(lines[i].begin(), lines[i].begin() + split);
164 // Skip any spaces after the colon.
167 } while (split < lines[i].size() && lines[i][split] == ' ');
169 string value(lines[i].begin() + split, lines[i].end());
171 // Remove “Content-encoding: metacube”.
172 // TODO: Make case-insensitive.
173 if (key == "Content-encoding" && value == "metacube") {
177 parameters.insert(make_pair(key, value));
180 // Change “Server: foo” to “Server: metacube/0.1 (reflecting: foo)”
181 // TODO: Make case-insensitive.
182 // XXX: Use a Via: instead?
183 if (parameters.count("Server") == 0) {
184 parameters.insert(make_pair("Server", SERVER_IDENTIFICATION));
186 for (multimap<string, string>::iterator it = parameters.begin();
187 it != parameters.end();
189 if (it->first != "Server") {
192 it->second = SERVER_IDENTIFICATION " (reflecting: " + it->second + ")";
196 // Construct the new HTTP header.
197 http_header = "HTTP/1.0 200 OK\r\n";
198 for (multimap<string, string>::iterator it = parameters.begin();
199 it != parameters.end();
201 http_header.append(it->first + ": " + it->second + "\r\n");
203 http_header.append("\r\n");
204 servers->set_header(stream_id, http_header);
209 void HTTPInput::do_work()
211 while (!should_stop) {
212 if (state == SENDING_REQUEST || state == RECEIVING_HEADER || state == RECEIVING_DATA) {
213 // Since we are non-blocking, we need to wait for the right state first.
214 // Wait up to 50 ms, then check should_stop.
217 pfd.events = (state == SENDING_REQUEST) ? POLLOUT : POLLIN;
218 pfd.events |= POLLRDHUP;
220 int nfds = poll(&pfd, 1, 50);
221 if (nfds == 0 || (nfds == -1 && errno == EINTR)) {
226 state = CLOSING_SOCKET;
233 request_bytes_sent = 0;
235 pending_data.clear();
236 servers->set_header(stream_id, "");
239 string protocol; // Thrown away.
240 if (!parse_url(url, &protocol, &host, &port, &path)) {
241 fprintf(stderr, "Failed to parse URL '%s'\n", url.c_str());
246 sock = lookup_and_connect(host, port);
248 // Yay, successful connect. Try to set it as nonblocking.
250 if (ioctl(sock, FIONBIO, &one) == -1) {
251 perror("ioctl(FIONBIO)");
252 state = CLOSING_SOCKET;
254 state = SENDING_REQUEST;
255 request = "GET " + path + " HTTP/1.0\r\nUser-Agent: cubemap\r\n\r\n";
256 request_bytes_sent = 0;
260 case SENDING_REQUEST: {
261 size_t to_send = request.size() - request_bytes_sent;
265 ret = write(sock, request.data() + request_bytes_sent, to_send);
266 } while (ret == -1 && errno == EINTR);
270 state = CLOSING_SOCKET;
275 request_bytes_sent += ret;
277 if (request_bytes_sent == request.size()) {
278 state = RECEIVING_HEADER;
282 case RECEIVING_HEADER: {
287 ret = read(sock, buf, sizeof(buf));
288 } while (ret == -1 && errno == EINTR);
292 state = CLOSING_SOCKET;
297 // This really shouldn't happen...
298 fprintf(stderr, "Socket unexpectedly closed while reading header\n");
299 state = CLOSING_SOCKET;
303 RequestParseStatus status = wait_for_double_newline(&response, buf, ret);
305 if (status == RP_OUT_OF_SPACE) {
306 fprintf(stderr, "WARNING: fd %d sent overlong response!\n", sock);
307 state = CLOSING_SOCKET;
309 } else if (status == RP_NOT_FINISHED_YET) {
313 // OK, so we're fine, but there might be some of the actual data after the response.
314 // We'll need to deal with that separately.
316 if (status == RP_EXTRA_DATA) {
317 char *ptr = static_cast<char *>(
318 memmem(response.data(), response.size(), "\r\n\r\n", 4));
320 extra_data = string(ptr, &response[0] + response.size());
321 response.resize(ptr - response.data());
324 if (!parse_response(response)) {
325 state = CLOSING_SOCKET;
329 if (!extra_data.empty()) {
330 process_data(&extra_data[0], extra_data.size());
333 state = RECEIVING_DATA;
336 case RECEIVING_DATA: {
341 ret = read(sock, buf, sizeof(buf));
342 } while (ret == -1 && errno == EINTR);
346 state = CLOSING_SOCKET;
351 // This really shouldn't happen...
352 fprintf(stderr, "Socket unexpectedly closed while reading header\n");
353 state = CLOSING_SOCKET;
357 process_data(buf, ret);
360 case CLOSING_SOCKET: {
364 } while (err == -1 && errno == EINTR);
370 state = NOT_CONNECTED;
377 // If we are still in NOT_CONNECTED, either something went wrong,
378 // or the connection just got closed.
379 // The earlier steps have already given the error message, if any.
380 if (state == NOT_CONNECTED && !should_stop) {
381 fprintf(stderr, "Waiting 0.2 second and restarting...\n");
387 void HTTPInput::process_data(char *ptr, size_t bytes)
389 pending_data.insert(pending_data.end(), ptr, ptr + bytes);
392 // If we don't have enough data (yet) for even the Metacube header, just return.
393 if (pending_data.size() < sizeof(metacube_block_header)) {
397 // Make sure we have the Metacube sync header at the start.
398 // We may need to skip over junk data (it _should_ not happen, though).
399 if (!has_metacube_header) {
400 char *ptr = static_cast<char *>(
401 memmem(pending_data.data(), pending_data.size(),
402 METACUBE_SYNC, strlen(METACUBE_SYNC)));
404 // OK, so we didn't find the sync marker. We know then that
405 // we do not have the _full_ marker in the buffer, but we
406 // could have N-1 bytes. Drop everything before that,
408 drop_pending_data(pending_data.size() - (strlen(METACUBE_SYNC) - 1));
411 // Yay, we found the header. Drop everything (if anything) before it.
412 drop_pending_data(ptr - pending_data.data());
413 has_metacube_header = true;
415 // Re-check that we have the entire header; we could have dropped data.
416 if (pending_data.size() < sizeof(metacube_block_header)) {
422 // Now it's safe to read the header.
423 metacube_block_header *hdr = reinterpret_cast<metacube_block_header *>(pending_data.data());
424 assert(memcmp(hdr->sync, METACUBE_SYNC, sizeof(hdr->sync)) == 0);
425 uint32_t size = ntohl(hdr->size);
426 uint32_t flags = ntohl(hdr->flags);
428 // See if we have the entire block. If not, wait for more data.
429 if (pending_data.size() < sizeof(metacube_block_header) + size) {
433 // Send this block on to the data.
434 char *inner_data = pending_data.data() + sizeof(metacube_block_header);
435 if (flags & METACUBE_FLAGS_HEADER) {
436 string header(inner_data, inner_data + size);
437 servers->set_header(stream_id, http_header + header);
439 servers->add_data(stream_id, inner_data, size);
442 // Consume the block. This isn't the most efficient way of dealing with things
443 // should we have many blocks, but these routines don't need to be too efficient
445 pending_data.erase(pending_data.begin(), pending_data.begin() + sizeof(metacube_block_header) + size);
446 has_metacube_header = false;
450 void HTTPInput::drop_pending_data(size_t num_bytes)
452 if (num_bytes == 0) {
455 fprintf(stderr, "Warning: Dropping %lld junk bytes from stream, maybe it is not a Metacube stream?\n",
456 (long long)num_bytes);
457 pending_data.erase(pending_data.begin(), pending_data.begin() + num_bytes);