+++ /dev/null
-#include <stdio.h>
-#include <string.h>
-#include <stdint.h>
-#include <assert.h>
-#include <arpa/inet.h>
-#include <sys/socket.h>
-#include <pthread.h>
-#include <sys/types.h>
-#include <sys/ioctl.h>
-#include <sys/poll.h>
-#include <signal.h>
-#include <errno.h>
-#include <ctype.h>
-#include <vector>
-#include <string>
-#include <map>
-#include <set>
-
-#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<sockaddr *>(&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<sockaddr *>(&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<ConfigLine> 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<string> deserialized_stream_ids;
- map<string, Input *> 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<string> 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<string>::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<void *>(server_sock));
-
- // Find all streams in the configuration file, and create inputs for them.
- vector<Input *> 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);
- }
-}
projects / cubemap / blobdiff