#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 "server.h"
#include "input.h"
+#include "state.pb.h"
#define NUM_SERVERS 4
#define STREAM_ID "stream"
using namespace std;
Server *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);
}
}
+// 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;
+}
+
+// Split a line on whitespace, e.g. "foo bar baz" -> {"foo", "bar", "baz"}.
+vector<string> split_tokens(const string &line)
+{
+ vector<string> ret;
+ string current_token;
+
+ for (size_t i = 0; i < line.size(); ++i) {
+ if (isspace(line[i])) {
+ if (!current_token.empty()) {
+ ret.push_back(current_token);
+ }
+ current_token.clear();
+ } else {
+ current_token.push_back(line[i]);
+ }
+ }
+ if (!current_token.empty()) {
+ ret.push_back(current_token);
+ }
+ return ret;
+}
+
+struct ConfigLine {
+ string keyword;
+ vector<string> arguments;
+ map<string, string> parameters;
+};
+
+// Parse the configuration file.
+vector<ConfigLine> parse_config(const string &filename)
+{
+ vector<ConfigLine> ret;
+
+ FILE *fp = fopen(filename.c_str(), "r");
+ if (fp == NULL) {
+ perror(filename.c_str());
+ exit(1);
+ }
+
+ char buf[4096];
+ while (!feof(fp)) {
+ if (fgets(buf, sizeof(buf), fp) == NULL) {
+ break;
+ }
+
+ // Chop off the string at the first #, \r or \n.
+ buf[strcspn(buf, "#\r\n")] = 0;
+
+ // Remove all whitespace from the end of the string.
+ size_t len = strlen(buf);
+ while (len > 0 && isspace(buf[len - 1])) {
+ buf[--len] = 0;
+ }
+
+ // If the line is now all blank, ignore it.
+ if (len == 0) {
+ continue;
+ }
+
+ vector<string> tokens = split_tokens(buf);
+ assert(!tokens.empty());
+
+ ConfigLine line;
+ line.keyword = tokens[0];
+
+ for (size_t i = 1; i < tokens.size(); ++i) {
+ // foo=bar is a parameter; anything else is an argument.
+ size_t equals_pos = tokens[i].find_first_of('=');
+ if (equals_pos == string::npos) {
+ line.arguments.push_back(tokens[i]);
+ } else {
+ string key = tokens[i].substr(0, equals_pos);
+ string value = tokens[i].substr(equals_pos + 1, string::npos);
+ line.parameters.insert(make_pair(key, value));
+ }
+ }
+
+ ret.push_back(line);
+ }
+
+ fclose(fp);
+}
+
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);
+
servers = new Server[NUM_SERVERS];
+
+ int server_sock;
+ 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) {
+ for (int j = 0; j < NUM_SERVERS; ++j) {
+ servers[j].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[i % NUM_SERVERS].add_client_from_serialized(loaded_state.clients(i));
+ }
+
+ // Deserialize the server socket.
+ server_sock = loaded_state.server_sock();
+
+ fprintf(stderr, "done.\n");
+ } else {
+ // TODO: This should come from a config file.
+ server_sock = create_server_socket(PORT);
+ for (int i = 0; i < NUM_SERVERS; ++i) {
+ servers[i].add_stream(STREAM_ID);
+ }
+ }
+
for (int i = 0; i < NUM_SERVERS; ++i) {
- servers[i].add_stream(STREAM_ID);
servers[i].run();
}
- int server_sock = create_server_socket(PORT);
-
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;
+ state.set_server_sock(server_sock);
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;
+
+ 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