65 lines
2.4 KiB
Lua
65 lines
2.4 KiB
Lua
-- Simple logger for LuaDist.
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module ("dist.logger", package.seeall)
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local cfg = require "dist.config"
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local sys = require "dist.sys"
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-- Open 'log_file' and return a log, or nil and error msg on error.
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local function get_log(log_file)
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log_file = log_file or cfg.log_file
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assert(type(log_file) == "string", "log.get_log: Argument 'log_file' is not a string.")
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log_file = sys.abs_path(log_file)
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sys.make_dir(sys.parent_dir(log_file))
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local log, err = io.open(log_file, "a")
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if not log then
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return nil, "Error: can't open a logfile '" .. log_file .. "': " .. err
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else
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return log
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end
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end
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-- Set the default log.
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local log_file = get_log(cfg.log_file)
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-- Log levels used.
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local log_levels = {
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DEBUG = 0, -- Fine-grained informational events that are most useful to debug an application.
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INFO = 1, -- Informational messages that highlight the progress of the application at coarse-grained level.
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WARN = 2, -- Potentially harmful situations.
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ERROR = 3, -- Error events that might still allow the application to continue running.
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FATAL = 4, -- Very severe error events that would presumably lead the application to abort.
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}
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-- Write 'message' with 'level' to 'log'.
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local function write(level, ...)
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assert(type(level) == "string", "log.write: Argument 'level' is not a string.")
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assert(#arg > 0, "log.write: No message arguments provided.")
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assert(type(log_levels[level]) == "number", "log.write: Unknown log level used: '" .. level .. "'.")
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level = level:upper()
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local message = table.concat(arg, " ")
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-- Check if writing for this log level is enabled.
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if cfg.write_log_level and log_levels[level] >= log_levels[cfg.write_log_level] then
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log_file:write(os.date("%Y-%m-%d %H:%M:%S") .. " [" .. level .. "]\t" .. message .. "\n")
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log_file:flush()
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end
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-- Check if printing for this log level is enabled.
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if cfg.print_log_level and log_levels[level] >= log_levels[cfg.print_log_level] then
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print(message)
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end
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end
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-- Functions with defined log levels for simple use.
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function debug(...) return write("DEBUG", ...) end
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function info(...) return write("INFO", ...) end
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function warn(...) return write("WARN", ...) end
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function error(...) return write("ERROR", ...) end
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function fatal(...) return write("FATAL", ...) end
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-- Function with explicitly specified log level.
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function log(level, ...) return write(level, ...) end
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