7 #include <sys/socket.h>
10 #include <sys/ioctl.h>
11 #include <sys/epoll.h>
18 #include "mutexlock.h"
21 #include "serverpool.h"
25 extern ServerPool *servers;
27 Input::Input(const string &stream_id, const string &url)
28 : stream_id(stream_id),
30 has_metacube_header(false)
38 // Joinable is already the default, but it's good to be certain.
40 pthread_attr_init(&attr);
41 pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_JOINABLE);
42 pthread_create(&worker_thread, &attr, Input::do_work_thunk, this);
49 if (pthread_join(worker_thread, NULL) == -1) {
50 perror("pthread_join");
55 void *Input::do_work_thunk(void *arg)
57 Input *input = static_cast<Input *>(arg);
64 CURL *curl = curl_easy_init();
66 while (!should_stop) {
67 curl_easy_setopt(curl, CURLOPT_URL, url.c_str());
68 curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, &Input::curl_callback_thunk);
69 curl_easy_setopt(curl, CURLOPT_WRITEDATA, this);
70 curl_easy_perform(curl);
72 printf("Transfer of '%s' ended, waiting 0.2 seconds and restarting...\n", url.c_str());
78 size_t Input::curl_callback_thunk(char *ptr, size_t size, size_t nmemb, void *userdata)
80 Input *input = static_cast<Input *>(userdata);
81 if (input->should_stop) {
85 size_t bytes = size * nmemb;
86 input->curl_callback(ptr, bytes);
90 void Input::curl_callback(char *ptr, size_t bytes)
92 pending_data.insert(pending_data.end(), ptr, ptr + bytes);
95 // If we don't have enough data (yet) for even the Metacube header, just return.
96 if (pending_data.size() < sizeof(metacube_block_header)) {
100 // Make sure we have the Metacube sync header at the start.
101 // We may need to skip over junk data (it _should_ not happen, though).
102 if (!has_metacube_header) {
103 char *ptr = static_cast<char *>(
104 memmem(pending_data.data(), pending_data.size(),
105 METACUBE_SYNC, strlen(METACUBE_SYNC)));
107 // OK, so we didn't find the sync marker. We know then that
108 // we do not have the _full_ marker in the buffer, but we
109 // could have N-1 bytes. Drop everything before that,
111 drop_pending_data(pending_data.size() - (strlen(METACUBE_SYNC) - 1));
114 // Yay, we found the header. Drop everything (if anything) before it.
115 drop_pending_data(ptr - pending_data.data());
116 has_metacube_header = true;
118 // Re-check that we have the entire header; we could have dropped data.
119 if (pending_data.size() < sizeof(metacube_block_header)) {
125 // Now it's safe to read the header.
126 metacube_block_header *hdr = reinterpret_cast<metacube_block_header *>(pending_data.data());
127 assert(memcmp(hdr->sync, METACUBE_SYNC, sizeof(hdr->sync)) == 0);
128 uint32_t size = ntohl(hdr->size);
129 uint32_t flags = ntohl(hdr->flags);
131 // See if we have the entire block. If not, wait for more data.
132 if (pending_data.size() < sizeof(metacube_block_header) + size) {
136 process_block(pending_data.data() + sizeof(metacube_block_header), size, flags);
138 // Consume this block. This isn't the most efficient way of dealing with things
139 // should we have many blocks, but these routines don't need to be too efficient
141 pending_data.erase(pending_data.begin(), pending_data.begin() + sizeof(metacube_block_header) + size);
142 has_metacube_header = false;
146 void Input::process_block(const char *data, uint32_t size, uint32_t flags)
148 if (flags & METACUBE_FLAGS_HEADER) {
149 string header(data, data + size);
150 servers->set_header(stream_id, header);
152 servers->add_data(stream_id, data, size);
156 void Input::drop_pending_data(size_t num_bytes)
158 if (num_bytes == 0) {
161 fprintf(stderr, "Warning: Dropping %lld junk bytes from stream, maybe it is not a Metacube stream?\n",
162 (long long)num_bytes);
163 pending_data.erase(pending_data.begin(), pending_data.begin() + num_bytes);