#include <sys/types.h>
#include <sys/ioctl.h>
#include <sys/epoll.h>
+#include <signal.h>
#include <errno.h>
+#include <ctype.h>
#include <vector>
#include <string>
#include <map>
#include "metacube.h"
+#include "parse.h"
#include "server.h"
+#include "serverpool.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 PORT 9094
using namespace std;
-Server *servers = NULL;
+ServerPool *servers = NULL;
+volatile bool hupped = false;
+
+void hup(int ignored)
+{
+ hupped = true;
+}
int create_server_socket(int port)
{
exit(1);
}
- int one;
+ int one = 1;
if (setsockopt(server_sock, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one)) == -1) {
perror("setsockopt(SO_REUSEADDR)");
exit(1);
}
// Pick a server, round-robin, and hand over the socket to it.
- servers[num_accepted % NUM_SERVERS].add_client(sock);
+ servers->add_client(sock);
++num_accepted;
}
}
+// 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)
{
- servers = new Server[NUM_SERVERS];
- for (int i = 0; i < NUM_SERVERS; ++i) {
- servers[i].add_stream(STREAM_ID);
- servers[i].run();
+ 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;
+ 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.
+ // TODO: Pick up new streams from the configuration file.
+ for (int i = 0; i < loaded_state.streams_size(); ++i) {
+ servers->add_stream_from_serialized(loaded_state.streams(i));
+ }
+
+ // 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 server socket.
+ server_sock = loaded_state.server_sock();
+ old_port = loaded_state.port();
+
+ fprintf(stderr, "done.\n");
+ } else {
+ // Find all streams in the configuration file, and create them.
+ 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];
+ servers->add_stream(stream_id);
+ }
}
- int server_sock = create_server_socket(PORT);
+ // 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));
- Input input(STREAM_ID);
- input.run(STREAM_URL);
+ // 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 = new Input(stream_id, src);
+ input->run();
+ inputs.push_back(input);
+ }
+
+ signal(SIGHUP, hup);
+
+ while (!hupped) {
+ usleep(100000);
+ }
+
+ // OK, we've been HUPed. Time to shut down everything, serialize, and re-exec.
+ for (size_t i = 0; i < inputs.size(); ++i) {
+ inputs[i]->stop();
+ delete inputs[i]; // TODO: serialize instead of using libcurl.
+ }
+
+ CubemapStateProto state;
+ state.set_server_sock(server_sock);
+ state.set_port(port);
+ for (int i = 0; i < num_servers; ++i) {
+ servers->get_server(i)->stop();
- for (int i = 0; i < NUM_SERVERS; ++i) {
- servers[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);
}
- delete[] servers;
}