7 #include <sys/socket.h>
10 #include <sys/ioctl.h>
11 #include <sys/epoll.h>
23 extern Server *servers;
25 Input::Input(const string &stream_id)
26 : stream_id(stream_id),
27 has_metacube_header(false)
31 void Input::run(const string &url)
33 CURL *curl = curl_easy_init();
34 curl_easy_setopt(curl, CURLOPT_URL, url.c_str());
35 curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, &Input::curl_callback_thunk);
36 curl_easy_setopt(curl, CURLOPT_WRITEDATA, this);
37 curl_easy_perform(curl);
40 size_t Input::curl_callback_thunk(char *ptr, size_t size, size_t nmemb, void *userdata)
42 Input *input = static_cast<Input *>(userdata);
43 size_t bytes = size * nmemb;
44 input->curl_callback(ptr, bytes);
48 void Input::curl_callback(char *ptr, size_t bytes)
50 pending_data.insert(pending_data.end(), ptr, ptr + bytes);
53 // If we don't have enough data (yet) for even the Metacube header, just return.
54 if (pending_data.size() < sizeof(metacube_block_header)) {
58 // Make sure we have the Metacube sync header at the start.
59 // We may need to skip over junk data (it _should_ not happen, though).
60 if (!has_metacube_header) {
61 char *ptr = static_cast<char *>(
62 memmem(pending_data.data(), pending_data.size(),
63 METACUBE_SYNC, strlen(METACUBE_SYNC)));
65 // OK, so we didn't find the sync marker. We know then that
66 // we do not have the _full_ marker in the buffer, but we
67 // could have N-1 bytes. Drop everything before that,
69 drop_pending_data(pending_data.size() - (strlen(METACUBE_SYNC) - 1));
72 // Yay, we found the header. Drop everything (if anything) before it.
73 drop_pending_data(ptr - pending_data.data());
74 has_metacube_header = true;
76 // Re-check that we have the entire header; we could have dropped data.
77 if (pending_data.size() < sizeof(metacube_block_header)) {
83 // Now it's safe to read the header.
84 metacube_block_header *hdr = reinterpret_cast<metacube_block_header *>(pending_data.data());
85 assert(memcmp(hdr->sync, METACUBE_SYNC, sizeof(hdr->sync)) == 0);
86 uint32_t size = ntohl(hdr->size);
87 uint32_t flags = ntohl(hdr->flags);
89 // See if we have the entire block. If not, wait for more data.
90 if (pending_data.size() < sizeof(metacube_block_header) + size) {
94 process_block(pending_data.data() + sizeof(metacube_block_header), size, flags);
96 // Consume this block. This isn't the most efficient way of dealing with things
97 // should we have many blocks, but these routines don't need to be too efficient
99 pending_data.erase(pending_data.begin(), pending_data.begin() + sizeof(metacube_block_header) + size);
103 void Input::process_block(const char *data, uint32_t size, uint32_t flags)
105 if (flags & METACUBE_FLAGS_HEADER) {
106 string header(data, data + size);
107 for (int i = 0; i < NUM_SERVERS; ++i) {
108 servers[i].set_header(stream_id, header);
111 for (int i = 0; i < NUM_SERVERS; ++i) {
112 servers[i].add_data(stream_id, data, size);
117 void Input::drop_pending_data(size_t num_bytes)
119 if (num_bytes == 0) {
122 fprintf(stderr, "Warning: Dropping %lld junk bytes from stream, maybe it is not a Metacube stream?\n",
123 (long long)num_bytes);
124 pending_data.erase(pending_data.begin(), pending_data.begin() + num_bytes);