X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=cubemap.cpp;h=3f136aa09e23f956d76747149b0ce47c4a8a9bb5;hb=6b4c7eecb5910b35ac61452cd5515ff1ee03d1de;hp=692d48baf1d9e507d36926aa10a7f35f7d8847b1;hpb=f3e2d52ccf79454ee157917f9017263a8f4c50c3;p=cubemap

diff --git a/cubemap.cpp b/cubemap.cpp
index 692d48b..3f136aa 100644
--- a/cubemap.cpp
+++ b/cubemap.cpp
@@ -9,7 +9,9 @@
 #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>
@@ -17,6 +19,7 @@
 #include "metacube.h"
 #include "server.h"
 #include "input.h"
+#include "state.pb.h"
 
 #define NUM_SERVERS 4
 #define STREAM_ID "stream"
@@ -26,6 +29,12 @@
 using namespace std;
 
 Server *servers = NULL;
+volatile bool hupped = false;
+
+void hup(int ignored)
+{
+	hupped = true;
+}
 
 int create_server_socket(int port)
 {
@@ -97,24 +106,240 @@ void *acceptor_thread_run(void *arg)
 	}
 }
 
+// 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);
+	}
 }