#include <sys/types.h>
#include <sys/ioctl.h>
#include <sys/epoll.h>
+#include <signal.h>
#include <errno.h>
#include <vector>
#include <string>
#include <map>
+
#include "metacube.h"
+#include "server.h"
+#include "input.h"
+#include "state.pb.h"
#define NUM_SERVERS 4
#define STREAM_ID "stream"
#define STREAM_URL "http://gruessi.zrh.sesse.net:4013/"
-#define BACKLOG_SIZE 1048576
#define PORT 9094
using namespace std;
-// Locks a pthread mutex, RAII-style.
-class MutexLock {
-public:
- MutexLock(pthread_mutex_t *mutex);
- ~MutexLock();
-
-private:
- pthread_mutex_t *mutex;
-};
-
-MutexLock::MutexLock(pthread_mutex_t *mutex)
- : mutex(mutex)
-{
- pthread_mutex_lock(mutex);
-}
-
-MutexLock::~MutexLock()
-{
- pthread_mutex_unlock(mutex);
-}
-
-struct Client {
- enum State { READING_REQUEST, SENDING_HEADER, SENDING_DATA };
- State state;
-
- // The HTTP request, as sent by the client. If we are in READING_REQUEST,
- // this might not be finished.
- string client_request;
-
-#if 0
- // What stream we're connecting to; parsed from client_request.
- // Not relevant for READING_REQUEST.
- string stream_id;
-#endif
-
- // Number of bytes we've sent of the header. Only relevant for SENDING_HEADER.
- size_t header_bytes_sent;
-
- // Number of bytes we've sent of data. Only relevant for SENDING_DATA.
- size_t bytes_sent;
-};
-
-struct Stream {
- // The HTTP response header, plus the video stream header (if any).
- string header;
-
- // The stream data itself, stored in a circular buffer.
- char data[BACKLOG_SIZE];
-
- // How many bytes <data> contains. Can very well be larger than BACKLOG_SIZE,
- // since the buffer wraps.
- size_t data_size;
-};
-
-class Server {
-public:
- Server();
-
- // Start a new thread that handles clients.
- void run();
- void add_client(int sock);
- void add_stream(const string &stream_id);
- void set_header(const string &stream_id, const string &header);
- void add_data(const string &stream_id, const char *data, size_t bytes);
-
-private:
- pthread_mutex_t mutex;
-
- // Map from stream ID to stream.
- map<string, Stream> streams;
-
- // Map from file descriptor to client.
- map<int, Client> clients;
-
- int epoll_fd;
-
- // Recover the this pointer, and call do_work().
- static void *do_work_thunk(void *arg);
-
- // The actual worker thread.
- void do_work();
-};
-
Server *servers = NULL;
+volatile bool hupped = false;
-Server::Server()
-{
- pthread_mutex_init(&mutex, NULL);
-
- epoll_fd = epoll_create(1024); // Size argument is ignored.
- if (epoll_fd == -1) {
- perror("epoll_fd");
- exit(1);
- }
-}
-
-void Server::run()
-{
- pthread_t thread;
- pthread_create(&thread, NULL, Server::do_work_thunk, this);
-}
-
-void *Server::do_work_thunk(void *arg)
-{
- Server *server = static_cast<Server *>(arg);
- server->do_work();
- return NULL;
-}
-
-void Server::do_work()
-{
- for ( ;; ) {
- MutexLock lock(&mutex);
- printf("server thread running\n");
- sleep(1);
- }
-}
-
-void Server::add_client(int sock)
-{
- MutexLock lock(&mutex);
- Client new_client;
- new_client.state = Client::READING_REQUEST;
- new_client.header_bytes_sent = 0;
- new_client.bytes_sent = 0;
-
- clients.insert(make_pair(sock, new_client));
-
- // Start listening on data from this socket.
- epoll_event ev;
- ev.events = EPOLLIN;
- ev.data.fd = sock;
- if (epoll_ctl(epoll_fd, EPOLL_CTL_ADD, sock, &ev) == -1) {
- perror("epoll_ctl(EPOLL_CTL_ADD)");
- exit(1);
- }
-}
-
-void Server::add_stream(const string &stream_id)
-{
- // TODO
-}
-
-void Server::set_header(const string &stream_id, const string &header)
-{
- // TODO
- printf("got header! %lu bytes\n", header.size());
-}
-
-void Server::add_data(const string &stream_id, const char *data, size_t bytes)
-{
- // TODO
-}
-
-class Input {
-public:
- Input(const string &stream_id);
-
- // Connect to the given URL and start streaming.
- // WARNING: Currently this blocks; it does not run in a separate thread!
- void run(const string &url);
-
-private:
- // Recovers the this pointer and calls curl_callback().
- static size_t curl_callback_thunk(char *ptr, size_t size, size_t nmemb, void *userdata);
-
- // Stores the given data, looks for Metacube blocks (skipping data if needed),
- // and calls process_block() for each one.
- void curl_callback(char *ptr, size_t bytes);
- void process_block(const char *data, uint32_t size, uint32_t flags);
-
- // Drops <num_bytes> bytes from the head of <pending_data>,
- // and outputs a warning.
- void drop_pending_data(size_t num_bytes);
-
- string stream_id;
-
- // Data we have received but not fully processed yet.
- vector<char> pending_data;
-
- // If <pending_data> starts with a Metacube header,
- // this is true.
- bool has_metacube_header;
-};
-
-Input::Input(const string &stream_id)
- : stream_id(stream_id),
- has_metacube_header(false)
-{
-}
-
-void Input::run(const string &url)
-{
- CURL *curl = curl_easy_init();
- curl_easy_setopt(curl, CURLOPT_URL, STREAM_URL);
- curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, &Input::curl_callback_thunk);
- curl_easy_setopt(curl, CURLOPT_WRITEDATA, this);
- curl_easy_perform(curl);
-}
-
-size_t Input::curl_callback_thunk(char *ptr, size_t size, size_t nmemb, void *userdata)
-{
- Input *input = static_cast<Input *>(userdata);
- size_t bytes = size * nmemb;
- input->curl_callback(ptr, bytes);
- return bytes;
-}
-
-void Input::curl_callback(char *ptr, size_t bytes)
-{
- pending_data.insert(pending_data.end(), ptr, ptr + bytes);
-
- for ( ;; ) {
- // If we don't have enough data (yet) for even the Metacube header, just return.
- if (pending_data.size() < sizeof(metacube_block_header)) {
- return;
- }
-
- // Make sure we have the Metacube sync header at the start.
- // We may need to skip over junk data (it _should_ not happen, though).
- if (!has_metacube_header) {
- char *ptr = static_cast<char *>(
- memmem(pending_data.data(), pending_data.size(),
- METACUBE_SYNC, strlen(METACUBE_SYNC)));
- if (ptr == NULL) {
- // OK, so we didn't find the sync marker. We know then that
- // we do not have the _full_ marker in the buffer, but we
- // could have N-1 bytes. Drop everything before that,
- // and then give up.
- drop_pending_data(pending_data.size() - (strlen(METACUBE_SYNC) - 1));
- return;
- } else {
- // Yay, we found the header. Drop everything (if anything) before it.
- drop_pending_data(ptr - pending_data.data());
- has_metacube_header = true;
-
- // Re-check that we have the entire header; we could have dropped data.
- if (pending_data.size() < sizeof(metacube_block_header)) {
- return;
- }
- }
- }
-
- // Now it's safe to read the header.
- metacube_block_header *hdr = reinterpret_cast<metacube_block_header *>(pending_data.data());
- assert(memcmp(hdr->sync, METACUBE_SYNC, sizeof(hdr->sync)) == 0);
- uint32_t size = ntohl(hdr->size);
- uint32_t flags = ntohl(hdr->flags);
-
- // See if we have the entire block. If not, wait for more data.
- if (pending_data.size() < sizeof(metacube_block_header) + size) {
- return;
- }
-
- process_block(pending_data.data(), size, flags);
-
- // Consume this block. This isn't the most efficient way of dealing with things
- // should we have many blocks, but these routines don't need to be too efficient
- // anyway.
- pending_data.erase(pending_data.begin(), pending_data.begin() + sizeof(metacube_block_header) + size);
- }
-}
-
-void Input::process_block(const char *data, uint32_t size, uint32_t flags)
-{
- if (flags & METACUBE_FLAGS_HEADER) {
- string header(data, data + size);
- for (int i = 0; i < NUM_SERVERS; ++i) {
- servers[i].set_header(stream_id, header);
- }
- } else {
- for (int i = 0; i < NUM_SERVERS; ++i) {
- servers[i].add_data(stream_id, data, size);
- }
- }
-}
-
-void Input::drop_pending_data(size_t num_bytes)
+void hup(int ignored)
{
- if (num_bytes == 0) {
- return;
- }
- fprintf(stderr, "Warning: Dropping %lld junk bytes from stream, maybe it is not a Metacube stream?\n",
- (long long)num_bytes);
- pending_data.erase(pending_data.begin(), pending_data.begin() + num_bytes);
+ hupped = true;
}
int create_server_socket(int port)
exit(1);
}
+ int one = 1;
+ if (setsockopt(server_sock, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one)) == -1) {
+ perror("setsockopt(SO_REUSEADDR)");
+ exit(1);
+ }
+
// We want dual-stack sockets. (Sorry, OpenBSD and Windows XP...)
int zero = 0;
if (setsockopt(server_sock, IPPROTO_IPV6, IPV6_V6ONLY, &zero, sizeof(zero)) == -1) {
pthread_t acceptor_thread;
pthread_create(&acceptor_thread, NULL, acceptor_thread_run, reinterpret_cast<void *>(server_sock));
- Input input(STREAM_ID);
- input.run(STREAM_URL);
+ Input input(STREAM_ID, STREAM_URL);
+ input.run();
+
+ signal(SIGHUP, hup);
+
+ while (!hupped) {
+ usleep(100000);
+ }
+
+ input.stop();
+
+ CubemapStateProto state;
+ for (int i = 0; i < NUM_SERVERS; ++i) {
+ servers[i].stop();
+
+ CubemapStateProto local_state = servers[i].serialize();
+
+ // The stream state should be identical between the servers, so we only store it once.
+ if (i == 0) {
+ state.mutable_streams()->MergeFrom(local_state.streams());
+ }
+ for (int j = 0; j < local_state.clients_size(); ++j) {
+ state.add_clients()->MergeFrom(local_state.clients(j));
+ }
+ }
+ delete[] servers;
+
+ printf("SERIALIZED: [%s]\n", state.DebugString().c_str());
}