X-Git-Url: https://git.sesse.net/?p=cubemap;a=blobdiff_plain;f=cubemap.cpp;fp=cubemap.cpp;h=0000000000000000000000000000000000000000;hp=1bcc07bd1e612573e85176749febdb204e9979f3;hb=c2a05ee22b52922d9c80f92d29062c845ebc80c3;hpb=9b565a9e6e66f076abb7266b2c2f015f585fa9cb diff --git a/cubemap.cpp b/cubemap.cpp deleted file mode 100644 index 1bcc07b..0000000 --- a/cubemap.cpp +++ /dev/null @@ -1,375 +0,0 @@ -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include - -#include "metacube.h" -#include "parse.h" -#include "server.h" -#include "serverpool.h" -#include "input.h" -#include "state.pb.h" - -#define STREAM_ID "stream" -#define STREAM_URL "http://gruessi.zrh.sesse.net:4013/" - -using namespace std; - -ServerPool *servers = NULL; -volatile bool hupped = false; - -void hup(int ignored) -{ - hupped = true; -} - -int create_server_socket(int port) -{ - int server_sock = socket(PF_INET6, SOCK_STREAM, IPPROTO_TCP); - if (server_sock == -1) { - perror("socket"); - 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) { - perror("setsockopt(IPV6_V6ONLY)"); - exit(1); - } - - // Set as non-blocking, so the acceptor thread can notice that we want to shut it down. - if (ioctl(server_sock, FIONBIO, &one) == -1) { - perror("ioctl(FIONBIO)"); - exit(1); - } - - sockaddr_in6 addr; - memset(&addr, 0, sizeof(addr)); - addr.sin6_family = AF_INET6; - addr.sin6_port = htons(port); - - if (bind(server_sock, reinterpret_cast(&addr), sizeof(addr)) == -1) { - perror("bind"); - exit(1); - } - - if (listen(server_sock, 128) == -1) { - perror("listen"); - exit(1); - } - - return server_sock; -} - -void *acceptor_thread_run(void *arg) -{ - int server_sock = int(intptr_t(arg)); - while (!hupped) { - // Since we are non-blocking, we need to wait for the right state first. - // Wait up to 50 ms, then check hupped. - pollfd pfd; - pfd.fd = server_sock; - pfd.events = POLLIN; - - int nfds = poll(&pfd, 1, 50); - if (nfds == 0 || (nfds == -1 && errno == EAGAIN)) { - continue; - } - if (nfds == -1) { - perror("poll"); - usleep(100000); - continue; - } - - sockaddr_in6 addr; - socklen_t addrlen = sizeof(addr); - - // Get a new socket. - int sock = accept(server_sock, reinterpret_cast(&addr), &addrlen); - if (sock == -1 && errno == EINTR) { - continue; - } - if (sock == -1) { - perror("accept"); - usleep(100000); - continue; - } - - // Set the socket as nonblocking. - int one = 1; - if (ioctl(sock, FIONBIO, &one) == -1) { - perror("FIONBIO"); - exit(1); - } - - // Pick a server, round-robin, and hand over the socket to it. - servers->add_client(sock); - } - return NULL; -} - -// Serialize the given state to a file descriptor, and return the (still open) -// descriptor. -int make_tempfile(const CubemapStateProto &state) -{ - char tmpl[] = "/tmp/cubemapstate.XXXXXX"; - int state_fd = mkstemp(tmpl); - if (state_fd == -1) { - perror("mkstemp"); - exit(1); - } - - string serialized; - state.SerializeToString(&serialized); - - const char *ptr = serialized.data(); - size_t to_write = serialized.size(); - while (to_write > 0) { - ssize_t ret = write(state_fd, ptr, to_write); - if (ret == -1) { - perror("write"); - exit(1); - } - - ptr += ret; - to_write -= ret; - } - - return state_fd; -} - -// Read the state back from the file descriptor made by make_tempfile, -// and close it. -CubemapStateProto read_tempfile(int state_fd) -{ - if (lseek(state_fd, 0, SEEK_SET) == -1) { - perror("lseek"); - exit(1); - } - - string serialized; - char buf[4096]; - for ( ;; ) { - ssize_t ret = read(state_fd, buf, sizeof(buf)); - if (ret == -1) { - perror("read"); - exit(1); - } - if (ret == 0) { - // EOF. - break; - } - - serialized.append(string(buf, buf + ret)); - } - - close(state_fd); // Implicitly deletes the file. - - CubemapStateProto state; - if (!state.ParseFromString(serialized)) { - fprintf(stderr, "PANIC: Failed deserialization of state.\n"); - exit(1); - } - - return state; -} - -int main(int argc, char **argv) -{ - fprintf(stderr, "\nCubemap starting.\n"); - - string config_filename = (argc == 1) ? "cubemap.config" : argv[1]; - vector config = parse_config(config_filename); - - int port = fetch_config_int(config, "port", 1, 65535); - int num_servers = fetch_config_int(config, "num_servers", 1, 20000); // Insanely high max limit. - - servers = new ServerPool(num_servers); - - int server_sock = -1, old_port = -1; - set deserialized_stream_ids; - map deserialized_inputs; - if (argc == 4 && strcmp(argv[2], "-state") == 0) { - fprintf(stderr, "Deserializing state from previous process... "); - int state_fd = atoi(argv[3]); - CubemapStateProto loaded_state = read_tempfile(state_fd); - - // Deserialize the streams. - for (int i = 0; i < loaded_state.streams_size(); ++i) { - servers->add_stream_from_serialized(loaded_state.streams(i)); - deserialized_stream_ids.insert(loaded_state.streams(i).stream_id()); - } - - // Put back the existing clients. It doesn't matter which server we - // allocate them to, so just do round-robin. - for (int i = 0; i < loaded_state.clients_size(); ++i) { - servers->add_client_from_serialized(loaded_state.clients(i)); - } - - // Deserialize the inputs. Note that we don't actually add them to any state yet. - for (int i = 0; i < loaded_state.inputs_size(); ++i) { - deserialized_inputs.insert(make_pair( - loaded_state.inputs(i).stream_id(), - new Input(loaded_state.inputs(i)))); - } - - // Deserialize the server socket. - server_sock = loaded_state.server_sock(); - old_port = loaded_state.port(); - - fprintf(stderr, "done.\n"); - } - - // Find all streams in the configuration file, and create them. - set expecting_stream_ids = deserialized_stream_ids; - for (unsigned i = 0; i < config.size(); ++i) { - if (config[i].keyword != "stream") { - continue; - } - if (config[i].arguments.size() != 1) { - fprintf(stderr, "ERROR: 'stream' takes exactly one argument\n"); - exit(1); - } - string stream_id = config[i].arguments[0]; - if (deserialized_stream_ids.count(stream_id) == 0) { - servers->add_stream(stream_id); - } - expecting_stream_ids.erase(stream_id); - } - - // Warn about any servers we've lost. - // TODO: Make an option (delete=yes?) to actually shut down streams. - for (set::const_iterator stream_it = expecting_stream_ids.begin(); - stream_it != expecting_stream_ids.end(); - ++stream_it) { - string stream_id = *stream_it; - fprintf(stderr, "WARNING: stream '%s' disappeared from the configuration file.\n", - stream_id.c_str()); - fprintf(stderr, " It will not be deleted, but clients will not get any new inputs.\n"); - if (deserialized_inputs.count(stream_id) != 0) { - delete deserialized_inputs[stream_id]; - deserialized_inputs.erase(stream_id); - } - } - - // Open a new server socket if we do not already have one, or if we changed ports. - if (server_sock != -1 && port != old_port) { - fprintf(stderr, "NOTE: Port changed from %d to %d; opening new socket.\n", old_port, port); - close(server_sock); - server_sock = -1; - } - if (server_sock == -1) { - server_sock = create_server_socket(port); - } - - servers->run(); - - pthread_t acceptor_thread; - pthread_create(&acceptor_thread, NULL, acceptor_thread_run, reinterpret_cast(server_sock)); - - // Find all streams in the configuration file, and create inputs for them. - vector inputs; - for (unsigned i = 0; i < config.size(); ++i) { - if (config[i].keyword != "stream") { - continue; - } - assert(config[i].arguments.size() == 1); - string stream_id = config[i].arguments[0]; - - if (config[i].parameters.count("src") == 0) { - fprintf(stderr, "WARNING: stream '%s' has no src= attribute, clients will not get any data.\n", - stream_id.c_str()); - continue; - } - - string src = config[i].parameters["src"]; - Input *input = NULL; - if (deserialized_inputs.count(stream_id) != 0) { - input = deserialized_inputs[stream_id]; - if (input->get_url() != src) { - fprintf(stderr, "INFO: Stream '%s' has changed URL from '%s' to '%s', restarting input.\n", - stream_id.c_str(), input->get_url().c_str(), src.c_str()); - delete input; - input = NULL; - } - deserialized_inputs.erase(stream_id); - } - if (input == NULL) { - input = new Input(stream_id, src); - } - input->run(); - inputs.push_back(input); - } - - // All deserialized inputs should now have been taken care of, one way or the other. - assert(deserialized_inputs.empty()); - - signal(SIGHUP, hup); - - while (!hupped) { - usleep(100000); - } - - // OK, we've been HUPed. Time to shut down everything, serialize, and re-exec. - if (pthread_join(acceptor_thread, NULL) == -1) { - perror("pthread_join"); - exit(1); - } - - CubemapStateProto state; - state.set_server_sock(server_sock); - state.set_port(port); - - for (size_t i = 0; i < inputs.size(); ++i) { - inputs[i]->stop(); - state.add_inputs()->MergeFrom(inputs[i]->serialize()); - } - - for (int i = 0; i < num_servers; ++i) { - servers->get_server(i)->stop(); - - CubemapStateProto local_state = servers->get_server(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; - - fprintf(stderr, "Serializing state and re-execing...\n"); - int state_fd = make_tempfile(state); - - char buf[16]; - sprintf(buf, "%d", state_fd); - - for ( ;; ) { - execlp(argv[0], argv[0], config_filename.c_str(), "-state", buf, NULL); - perror("execlp"); - fprintf(stderr, "PANIC: re-exec of %s failed. Waiting 0.2 seconds and trying again...\n", argv[0]); - usleep(200000); - } -}