/UPGRADE - upgrade-on-the-fly feature. Currently only moves the active

server connections to the new irssi process, but that should be enough to
never quit from IRC again :)


git-svn-id: http://svn.irssi.org/repos/irssi/trunk@2070 dbcabf3a-b0e7-0310-adc4-f8d773084564

11 files changed, 366 insertions, 6 deletions

diff --git a/src/core/Makefile.am b/src/core/Makefile.am
index 9f5298f7..e2007ecc 100644
--- a/src/core/Makefile.am
+++ b/src/core/Makefile.am
@@ -45,6 +45,7 @@ libcore_a_SOURCES = \
 	servers.c \
 	servers-reconnect.c \
 	servers-setup.c \
+	session.c \
 	settings.c \
 	signals.c \
 	special-vars.c \
@@ -92,6 +93,7 @@ noinst_HEADERS = \
 	servers.h \
 	servers-reconnect.h \
 	servers-setup.h \
+	session.h \
 	settings.h \
 	signals.h \
 	special-vars.h \
diff --git a/src/core/core.c b/src/core/core.c
index ef2af512..7fd00465 100644
--- a/src/core/core.c
+++ b/src/core/core.c
@@ -29,6 +29,7 @@
 #include "net-sendbuffer.h"
 #include "signals.h"
 #include "settings.h"
+#include "session.h"
 
 #include "chat-protocols.h"
 #include "servers.h"
@@ -186,7 +187,9 @@ void core_init_paths(int argc, char *argv[])
         if (irssi_dir == NULL)
 		irssi_dir = g_strdup_printf(IRSSI_DIR_FULL, g_get_home_dir());
 	if (irssi_config_file == NULL)
-                irssi_config_file = g_strdup_printf("%s/config", irssi_dir);
+		irssi_config_file = g_strdup_printf("%s/config", irssi_dir);
+
+	session_set_binary(argv[0]);
 }
 
 static void sig_irssi_init_finished(void)
@@ -213,7 +216,8 @@ void core_init(int argc, char *argv[])
 
 	settings_init();
 	commands_init();
-        nickmatch_cache_init();
+	nickmatch_cache_init();
+        session_init();
 
 	chat_protocols_init();
 	chatnets_init();
@@ -267,6 +271,7 @@ void core_deinit(void)
 	chatnets_deinit();
 	chat_protocols_deinit();
 
+        session_deinit();
         nickmatch_cache_deinit();
 	commands_deinit();
 	settings_deinit();
diff --git a/src/core/server-rec.h b/src/core/server-rec.h
index 52526fde..967da1f2 100644
--- a/src/core/server-rec.h
+++ b/src/core/server-rec.h
@@ -12,6 +12,7 @@ char *nick; /* current nick */
 
 unsigned int connected:1; /* connected to server */
 unsigned int connection_lost:1; /* Connection lost unintentionally */
+unsigned int session_reconnect:1; /* Connected to this server with /UPGRADE */
 
 NET_SENDBUF_REC *handle;
 int readtag; /* input tag */
diff --git a/src/core/servers.c b/src/core/servers.c
index fe21f131..c7ad061c 100644
--- a/src/core/servers.c
+++ b/src/core/servers.c
@@ -196,10 +196,15 @@ static void server_connect_callback_readpipe(SERVER_REC *server)
 	own_ip = ip == NULL ? NULL :
 		(IPADDR_IS_V6(ip) ? conn->own_ip6 : conn->own_ip4);
 
-	if (ip != NULL)
-		signal_emit("server connecting", 2, server, ip);
+	handle = NULL;
+	if (ip != NULL) {
+		/* allow "server connecting" signal to create the
+		   connection handle */
+		signal_emit("server connecting", 3, server, ip, &handle);
+                if (handle == NULL)
+			handle = net_connect_ip(ip, port, own_ip);
+	}
 
-	handle = ip == NULL ? NULL : net_connect_ip(ip, port, own_ip);
 	if (handle == NULL) {
 		/* failed */
 		if (iprec.error != 0 && net_hosterror_notfound(iprec.error)) {
diff --git a/src/core/session.c b/src/core/session.c
new file mode 100644
index 00000000..1f990972
--- /dev/null
+++ b/src/core/session.c
@@ -0,0 +1,233 @@
+/*
+ session.c : irssi
+
+    Copyright (C) 2001 Timo Sirainen
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program; if not, write to the Free Software
+    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+*/
+
+#include "module.h"
+#include "signals.h"
+#include "commands.h"
+#include "args.h"
+#include "net-sendbuffer.h"
+#include "lib-config/iconfig.h"
+
+#include "chat-protocols.h"
+#include "servers.h"
+#include "servers-setup.h"
+
+static char *session_file;
+static const char *irssi_binary; /* from argv[0] */
+
+static GIOChannel *next_handle;
+
+void session_set_binary(const char *path)
+{
+        irssi_binary = path;
+}
+
+static void cmd_upgrade(const char *data)
+{
+	CONFIG_REC *session;
+        GSList *file_handles;
+	const char *args[10];
+	char *session_file;
+        int pid, n;
+
+	if (*data == '\0')
+		data = irssi_binary;
+
+        /* make sure we can execute it */
+	if (access(data, X_OK) != 0)
+		cmd_return_error(CMDERR_ERRNO);
+
+	/* save the session */
+        session_file = g_strdup_printf("%s/session.%d", get_irssi_dir(), getpid());
+        unlink(session_file);
+	session = config_open(session_file, 0600);
+
+        file_handles = NULL;
+	signal_emit("session save", 2, session, &file_handles);
+        config_write(session, NULL, -1);
+        config_close(session);
+
+        /* start it .. */
+	pid = fork();
+	if (pid == -1)
+		cmd_return_error(CMDERR_ERRNO);
+
+	if (pid == 0) {
+		/* we're the child - we want to send the server connections
+		   to the new binary here */
+		g_free(session_file);
+                exit(0);
+	} else {
+		/* we're the old process - exec() the new binary here so
+		   the TTY won't get lost */
+                signal_emit("session clean", 0);
+		for (n = 3; n < 256; n++) {
+                        if (g_slist_find(file_handles, GINT_TO_POINTER(n)) == NULL)
+				close(n);
+		}
+                g_slist_free(file_handles),
+
+		args[0] = data;
+                args[1] = "--session";
+		args[2] = session_file;
+		args[3] = "-!";
+                args[4] = NULL;
+                execvp(args[0], (char **) args);
+
+		fprintf(stderr, "exec: %s: %s\n", args[0], g_strerror(errno));
+		_exit(-1);
+	}
+}
+
+static void session_save_server(SERVER_REC *server, CONFIG_REC *config,
+				CONFIG_NODE *node, GSList **file_handles)
+{
+	int handle;
+
+	node = config_node_section(node, NULL, NODE_TYPE_BLOCK);
+
+	config_node_set_str(config, node, "chat_type",
+			    chat_protocol_find_id(server->chat_type)->name);
+	config_node_set_str(config, node, "address", server->connrec->address);
+	config_node_set_int(config, node, "port", server->connrec->port);
+	config_node_set_str(config, node, "chatnet", server->connrec->chatnet);
+	config_node_set_str(config, node, "password", server->connrec->password);
+	config_node_set_str(config, node, "nick", server->nick);
+
+	handle = g_io_channel_unix_get_fd(net_sendbuffer_handle(server->handle));
+	*file_handles = g_slist_append(*file_handles, GINT_TO_POINTER(handle));
+	config_node_set_int(config, node, "handle", handle);
+
+	signal_emit("session save server", 4,
+		    server, config, node, file_handles);
+}
+
+static void session_restore_server(CONFIG_NODE *node)
+{
+	CHAT_PROTOCOL_REC *proto;
+	SERVER_CONNECT_REC *conn;
+        SERVER_REC *server;
+	const char *chat_type, *address, *chatnet, *password, *nick;
+        int port, handle;
+
+        chat_type = config_node_get_str(node, "chat_type", NULL);
+	address = config_node_get_str(node, "address", NULL);
+	port = config_node_get_int(node, "port", 0);
+	chatnet = config_node_get_str(node, "chatnet", NULL);
+	password = config_node_get_str(node, "password", NULL);
+	nick = config_node_get_str(node, "nick", NULL);
+	handle = config_node_get_int(node, "handle", -1);
+
+	if (chat_type == NULL || address == NULL || nick == NULL || handle < 0)
+		return;
+
+	proto = chat_protocol_find(chat_type);
+	if (proto == NULL || proto->not_initialized)
+		return;
+
+	conn = server_create_conn(proto->id, address, port,
+				  chatnet, password, nick);
+	if (conn != NULL) {
+		next_handle = g_io_channel_unix_new(handle);
+		conn->reconnection = TRUE;
+
+		server = proto->server_connect(conn);
+		server->session_reconnect = TRUE;
+
+		signal_emit("session restore server", 2, server, node);
+	}
+}
+
+static void sig_session_save(CONFIG_REC *config, GSList **file_handles)
+{
+	CONFIG_NODE *node;
+        GSList *tmp;
+
+	node = config_node_traverse(config, "(servers", TRUE);
+	for (tmp = servers; tmp != NULL; tmp = tmp->next)
+                session_save_server(tmp->data, config, node, file_handles);
+}
+
+static void sig_session_restore(CONFIG_REC *config)
+{
+	CONFIG_NODE *node;
+        GSList *tmp;
+
+	node = config_node_traverse(config, "(servers", FALSE);
+	if (node != NULL) {
+		for (tmp = node->value; tmp != NULL; tmp = config_node_next(tmp))
+			session_restore_server(tmp->data);
+	}
+}
+
+static void sig_init_finished(void)
+{
+	CONFIG_REC *session;
+
+	if (session_file == NULL)
+		return;
+
+	session = config_open(session_file, -1);
+	if (session == NULL)
+		return;
+
+	config_parse(session);
+        signal_emit("session restore", 1, session);
+	config_close(session);
+
+	unlink(session_file);
+	session_file = NULL;
+}
+
+static void sig_connecting(SERVER_REC *server, IPADDR *ip, GIOChannel **handle)
+{
+        *handle = next_handle;
+	next_handle = NULL;
+}
+
+void session_init(void)
+{
+	static struct poptOption options[] = {
+		{ "session", 0, POPT_ARG_STRING, &session_file, 0, "", "" },
+		{ NULL, '\0', 0, NULL }
+	};
+
+        session_file = NULL;
+	args_register(options);
+
+	command_bind("upgrade", NULL, (SIGNAL_FUNC) cmd_upgrade);
+
+	signal_add("session save", (SIGNAL_FUNC) sig_session_save);
+	signal_add("session restore", (SIGNAL_FUNC) sig_session_restore);
+	signal_add("irssi init finished", (SIGNAL_FUNC) sig_init_finished);
+
+	signal_add("server connecting", (SIGNAL_FUNC) sig_connecting);
+}
+
+void session_deinit(void)
+{
+        command_unbind("upgrade", (SIGNAL_FUNC) cmd_upgrade);
+
+	signal_remove("session save", (SIGNAL_FUNC) sig_session_save);
+	signal_remove("session restore", (SIGNAL_FUNC) sig_session_restore);
+	signal_remove("irssi init finished", (SIGNAL_FUNC) sig_init_finished);
+
+	signal_remove("server connecting", (SIGNAL_FUNC) sig_connecting);
+}
diff --git a/src/core/session.h b/src/core/session.h
new file mode 100644
index 00000000..a0e789d1
--- /dev/null
+++ b/src/core/session.h
@@ -0,0 +1,9 @@
+#ifndef __SESSION_H
+#define __SESSION_H
+
+void session_set_binary(const char *path);
+
+void session_init(void);
+void session_deinit(void);
+
+#endif
diff --git a/src/fe-text/irssi.c b/src/fe-text/irssi.c
index 919802fc..01c5d4f4 100644
--- a/src/fe-text/irssi.c
+++ b/src/fe-text/irssi.c
@@ -140,6 +140,7 @@ static void textui_init(void)
 
 	theme_register(gui_text_formats);
 	signal_add("gui exit", (SIGNAL_FUNC) sig_exit);
+	signal_add("session clean", (SIGNAL_FUNC) term_deinit);
 }
 
 static void textui_finish_init(void)
@@ -195,6 +196,7 @@ static void textui_deinit(void)
 
         dirty_check(); /* one last time to print any quit messages */
 	signal_remove("gui exit", (SIGNAL_FUNC) sig_exit);
+	signal_remove("session clean", (SIGNAL_FUNC) term_deinit);
 
         lastlog_deinit();
 	statusbar_deinit();
diff --git a/src/irc/core/Makefile.am b/src/irc/core/Makefile.am
index 9a12b7f4..fb84a0b5 100644
--- a/src/irc/core/Makefile.am
+++ b/src/irc/core/Makefile.am
@@ -25,6 +25,7 @@ libirc_core_a_SOURCES = \
         irc-servers.c \
         irc-servers-reconnect.c \
         irc-servers-setup.c \
+        irc-session.c \
         lag.c \
         massjoin.c \
         modes.c \
diff --git a/src/irc/core/irc-core.c b/src/irc/core/irc-core.c
index 8906efbe..efede641 100644
--- a/src/irc/core/irc-core.c
+++ b/src/irc/core/irc-core.c
@@ -36,6 +36,9 @@
 void irc_expandos_init(void);
 void irc_expandos_deinit(void);
 
+void irc_session_init(void);
+void irc_session_deinit(void);
+
 void lag_init(void);
 void lag_deinit(void);
 
@@ -100,6 +103,7 @@ void irc_core_init(void)
 	chat_protocol_register(rec);
         g_free(rec);
 
+        irc_session_init();
 	irc_chatnets_init();
 	irc_servers_init();
 	irc_channels_init();
@@ -130,6 +134,7 @@ void irc_core_deinit(void)
 	irc_irc_deinit();
 	irc_servers_deinit();
 	irc_chatnets_deinit();
+        irc_session_deinit();
 
 	chat_protocol_unregister("IRC");
 }
diff --git a/src/irc/core/irc-servers.c b/src/irc/core/irc-servers.c
index 3314aa24..1a082e82 100644
--- a/src/irc/core/irc-servers.c
+++ b/src/irc/core/irc-servers.c
@@ -249,7 +249,9 @@ static void sig_connected(IRC_SERVER_REC *server)
 		return;
 
 	server->splits = g_hash_table_new((GHashFunc) g_istr_hash, (GCompareFunc) g_istr_equal);
-	server_init(server);
+
+        if (!server->session_reconnect)
+		server_init(server);
 }
 
 static void sig_disconnected(IRC_SERVER_REC *server)
diff --git a/src/irc/core/irc-session.c b/src/irc/core/irc-session.c
new file mode 100644
index 00000000..226a7489
--- /dev/null
+++ b/src/irc/core/irc-session.c
@@ -0,0 +1,95 @@
+/*
+ irc-session.c : irssi
+
+    Copyright (C) 2001 Timo Sirainen
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program; if not, write to the Free Software
+    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+*/
+
+#include "module.h"
+#include "signals.h"
+#include "lib-config/iconfig.h"
+
+#include "irc-servers.h"
+#include "irc-channels.h"
+
+static void sig_session_save_server(IRC_SERVER_REC *server, CONFIG_REC *config,
+				    CONFIG_NODE *node)
+{
+	char *chans;
+
+	if (!IS_IRC_SERVER(server))
+		return;
+
+	config_node_set_str(config, node, "real_address", server->real_address);
+	config_node_set_str(config, node, "userhost", server->userhost);
+
+        chans = irc_server_get_channels(server);
+	config_node_set_str(config, node, "channels", chans);
+        g_free(chans);
+}
+
+static void sig_session_restore_server(IRC_SERVER_REC *server,
+				       CONFIG_NODE *node)
+{
+	if (!IS_IRC_SERVER(server))
+		return;
+
+        if (server->real_address == NULL)
+		server->real_address = g_strdup(config_node_get_str(node, "real_address", NULL));
+	server->userhost = g_strdup(config_node_get_str(node, "userhost", NULL));
+
+	g_free_not_null(server->connrec->channels);
+	server->connrec->channels = g_strdup(config_node_get_str(node, "channels", NULL));
+}
+
+static void sig_connected(IRC_SERVER_REC *server)
+{
+	GSList *tmp;
+        char *str;
+
+	if (!IS_IRC_SERVER(server) || !server->session_reconnect)
+		return;
+
+	str = g_strdup_printf("%s :Restoring connection to %s",
+			      server->nick, server->connrec->address);
+	signal_emit("event 001", 3, server, str, server->real_address);
+        g_free(str);
+
+        /* send join events for each channel and ask names list for them */
+	for (tmp = server->channels; tmp != NULL; tmp = tmp->next) {
+		CHANNEL_REC *rec = tmp->data;
+
+		signal_emit("event join", 4, server, rec->name,
+			    server->nick, server->userhost);
+                irc_send_cmdv(server, "NAMES %s", rec->name);
+	}
+}
+
+void irc_session_init(void)
+{
+	signal_add("session save server", (SIGNAL_FUNC) sig_session_save_server);
+	signal_add("session restore server", (SIGNAL_FUNC) sig_session_restore_server);
+
+	signal_add("server connected", (SIGNAL_FUNC) sig_connected);
+}
+
+void irc_session_deinit(void)
+{
+	signal_remove("session save server", (SIGNAL_FUNC) sig_session_save_server);
+	signal_remove("session restore server", (SIGNAL_FUNC) sig_session_restore_server);
+
+	signal_remove("server connected", (SIGNAL_FUNC) sig_connected);
+}