Mercurial > mooncached / file diff

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/util/logger.lua	Sat Jul 31 16:09:11 2010 +0100
@@ -0,0 +1,154 @@
+-- Prosody IM
+-- Copyright (C) 2008-2010 Matthew Wild
+-- Copyright (C) 2008-2010 Waqas Hussain
+-- 
+-- This project is MIT/X11 licensed. Please see the
+-- COPYING file in the source package for more information.
+--
+
+local pcall = pcall;
+
+--local log_sources = config.get("*", "core", "log_sources");
+
+local find = string.find;
+local ipairs, pairs, setmetatable = ipairs, pairs, setmetatable;
+
+module "logger"
+
+local name_sinks, level_sinks = {}, {};
+local name_patterns = {};
+
+-- Weak-keyed so that loggers are collected
+local modify_hooks = setmetatable({}, { __mode = "k" });
+
+local make_logger;
+local outfunction = nil;
+
+function init(name)
+	if log_sources then
+		local log_this = false;
+		for _, source in ipairs(log_sources) do
+			if find(name, source) then 
+				log_this = true;
+				break;
+			end
+		end
+		
+		if not log_this then return function () end end
+	end
+	
+	local log_debug = make_logger(name, "debug");
+	local log_info = make_logger(name, "info");
+	local log_warn = make_logger(name, "warn");
+	local log_error = make_logger(name, "error");
+
+	--name = nil; -- While this line is not commented, will automatically fill in file/line number info
+	local namelen = #name;
+	return function (level, message, ...)
+			if outfunction then return outfunction(name, level, message, ...); end
+			
+			if level == "debug" then
+				return log_debug(message, ...);
+			elseif level == "info" then
+				return log_info(message, ...);
+			elseif level == "warn" then
+				return log_warn(message, ...);
+			elseif level == "error" then
+				return log_error(message, ...);
+			end
+		end
+end
+
+function make_logger(source_name, level)
+	local level_handlers = level_sinks[level];
+	if not level_handlers then
+		level_handlers = {};
+		level_sinks[level] = level_handlers;
+	end
+
+	local source_handlers = name_sinks[source_name];
+	
+	-- All your premature optimisation is belong to me!
+	local num_level_handlers, num_source_handlers = #level_handlers, source_handlers and #source_handlers;
+	
+	local logger = function (message, ...)
+		if source_handlers then
+			for i = 1,num_source_handlers do
+				if source_handlers[i](source_name, level, message, ...) == false then
+					return;
+				end
+			end
+		end
+		
+		for i = 1,num_level_handlers do
+			level_handlers[i](source_name, level, message, ...);
+		end
+	end
+
+	-- To make sure our cached lengths stay in sync with reality
+	modify_hooks[logger] = function () num_level_handlers, num_source_handlers = #level_handlers, source_handlers and #source_handlers; end; 
+	
+	return logger;
+end
+
+function setwriter(f)
+	local old_func = outfunction;
+	if not f then outfunction = nil; return true, old_func; end
+	local ok, ret = pcall(f, "logger", "info", "Switched logging output successfully");
+	if ok then
+		outfunction = f;
+		ret = old_func;
+	end
+	return ok, ret;
+end
+
+function reset()
+	for k in pairs(name_sinks) do name_sinks[k] = nil; end
+	for level, handler_list in pairs(level_sinks) do
+		-- Clear all handlers for this level
+		for i = 1, #handler_list do
+			handler_list[i] = nil;
+		end
+	end
+	for k in pairs(name_patterns) do name_patterns[k] = nil; end
+
+	for _, modify_hook in pairs(modify_hooks) do
+		modify_hook();
+	end
+end
+
+function add_level_sink(level, sink_function)
+	if not level_sinks[level] then
+		level_sinks[level] = { sink_function };
+	else
+		level_sinks[level][#level_sinks[level] + 1 ] = sink_function;
+	end
+	
+	for _, modify_hook in pairs(modify_hooks) do
+		modify_hook();
+	end
+end
+
+function add_name_sink(name, sink_function, exclusive)
+	if not name_sinks[name] then
+		name_sinks[name] = { sink_function };
+	else
+		name_sinks[name][#name_sinks[name] + 1] = sink_function;
+	end
+	
+	for _, modify_hook in pairs(modify_hooks) do
+		modify_hook();
+	end
+end
+
+function add_name_pattern_sink(name_pattern, sink_function, exclusive)
+	if not name_patterns[name_pattern] then
+		name_patterns[name_pattern] = { sink_function };
+	else
+		name_patterns[name_pattern][#name_patterns[name_pattern] + 1] = sink_function;
+	end
+end
+
+_M.new = make_logger;
+
+return _M;