From 8a5a7e3e62e477e3075a9b941e282b4f65bab05b Mon Sep 17 00:00:00 2001
From: Matthew Wild <mwild1@gmail.com>
Date: Sun, 12 Apr 2009 02:57:52 +0100
Subject: mod_posix: Allow logging and pidfile options to take effect without
 needing to daemonize. Add the ability to catch SIGTERM.

---
 plugins/mod_posix.lua | 117 +++++++++++++++++++++++++++++++-------------------
 1 file changed, 72 insertions(+), 45 deletions(-)

(limited to 'plugins')

diff --git a/plugins/mod_posix.lua b/plugins/mod_posix.lua
index 901cb53d..2c56f694 100644
--- a/plugins/mod_posix.lua
+++ b/plugins/mod_posix.lua
@@ -4,43 +4,69 @@ local want_pposix_version = "0.3.0";
 local pposix = assert(require "util.pposix");
 if pposix._VERSION ~= want_pposix_version then module:log("warn", "Unknown version (%s) of binary pposix module, expected %s", tostring(pposix._VERSION), want_pposix_version); end
 
+local signal = select(2, pcall(require, "util.signal"));
+if type(signal) == "string" then
+	log("warn", "Couldn't load signal library, won't respond to SIGTERM");
+end
+
 local config_get = require "core.configmanager".get;
 local logger_set = require "util.logger".setwriter;
 
 module.host = "*"; -- we're a global module
 
+local function write_pidfile()
+	local pidfile = config.get("*", "core", "pidfile");
+	if pidfile then
+		local pf, err = io.open(pidfile, "w+");
+		if not pf then
+			log("error", "Couldn't write pidfile; %s", err);
+		else
+			pf:write(tostring(pposix.getpid()));
+			pf:close();
+		end
+	end
+end
+
+local logfilename = config_get("*", "core", "log");
+if logfilename == "syslog" then
+	pposix.syslog_open("prosody");
+	pposix.syslog_setminlevel(config.get("*", "core", "minimum_log_level") or "info");
+		local syslog, format = pposix.syslog_log, string.format;
+		logwriter = function (name, level, message, ...)
+					if ... then 
+						syslog(level, format(message, ...));
+					else
+						syslog(level, message);
+					end
+				end;			
+elseif logfilename then
+	local logfile = io.open(logfilename, "a+");
+	if logfile then
+		local write, format, flush = logfile.write, string.format, logfile.flush;
+		logwriter = function (name, level, message, ...)
+					if ... then 
+						write(logfile, name, "\t", level, "\t", format(message, ...), "\n");
+					else
+						write(logfile, name, "\t" , level, "\t", message, "\n");
+					end
+					flush(logfile);
+				end;
+	end
+else
+	log("debug", "No logging specified, will continue with default");
+end
+
+if logwriter then
+	local ok, ret = logger_set(logwriter);
+	if not ok then
+		log("error", "Couldn't set new log output: %s", ret);
+	end
+end
+
 if not config_get("*", "core", "no_daemonize") then
 	local function daemonize_server()
 		local logwriter;
 		
-		local logfilename = config_get("*", "core", "log");
-		if logfilename == "syslog" then
-			pposix.syslog_open("prosody");
-			pposix.syslog_setminlevel(config.get("*", "core", "minimum_log_level") or "info");
-				local syslog, format = pposix.syslog_log, string.format;
-				logwriter = function (name, level, message, ...)
-							if ... then 
-								syslog(level, format(message, ...));
-							else
-								syslog(level, message);
-							end
-						end;			
-		elseif logfilename then
-			local logfile = io.open(logfilename, "a+");
-			if logfile then
-				local write, format, flush = logfile.write, string.format, logfile.flush;
-				logwriter = function (name, level, message, ...)
-							if ... then 
-								write(logfile, name, "\t", level, "\t", format(message, ...), "\n");
-							else
-								write(logfile, name, "\t" , level, "\t", message, "\n");
-							end
-							flush(logfile);
-						end;
-			end
-		else
-			log("debug", "No logging specified, will continue with default");
-		end
 		
 		local ok, ret = pposix.daemonize();
 		if not ok then
@@ -48,25 +74,26 @@ if not config_get("*", "core", "no_daemonize") then
 		elseif ret and ret > 0 then
 			os.exit(0);
 		else
-			if logwriter then
-				local ok, ret = logger_set(logwriter);
-				if not ok then
-					log("error", "Couldn't set new log output: %s", ret);
-				end
-			end
 			log("info", "Successfully daemonized to PID %d", pposix.getpid());
-			
-			local pidfile = config.get("*", "core", "pidfile");
-			if pidfile then
-				local pf, err = io.open(pidfile, "w+");
-				if not pf then
-					log("error", "Couldn't write pidfile; %s", err);
-				else
-					pf:write(tostring(pposix.getpid()));
-					pf:close();
-				end
-			end
+			write_pidfile();
 		end
 	end
 	module:add_event_hook("server-starting", daemonize_server);
+else
+	write_pidfile();
+	-- Not going to daemonize, but let's write the pidfile anyway
+end
+
+-- Set signal handler
+if signal.signal then
+	signal.signal("SIGTERM", function ()
+		log("warn", "Received SIGTERM...");
+		unlock_globals();
+		if prosody_shutdown then
+			prosody_shutdown("Received SIGTERM");
+		else
+			log("warn", "...no prosody_shutdown(), ignoring.");
+		end
+		lock_globals();
+	end);
 end
-- 
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