matlab/logging/base_logger.m

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+%
+% -----------------
+% Copyright © 2024 ACK Cyfronet AGH, Poland.
+% -----------------
+%
+% BASE_LOGGER A singleton logger class for logging messages to a file.
+%
+% This class implements a simple logging mechanism with different log levels
+% (TRACE, DEBUG, INFO, WARNING, ERROR) and writes log entries to a file.
+% It follows the Singleton pattern to ensure that only one instance of the logger
+% exists throughout the application.
+%
+% The log file is specified by the environment variable 'APP_LOG_FILE'. If
+% the variable is not set, a default file 'base-logger-log.log' is used.
+%
+% Properties:
+%   fid - (private) The file identifier for the log file. This is used to write logs.
+%
+% Methods:
+%
+%   getInstance() - Retrieves the singleton instance of the logger.
+%
+%   trace(varargin) - Logs one or more messages with TRACE level.
+%     @param varargin The messages to log. Can be strings, numbers, or MException objects.
+%
+%   debug(varargin) - Logs one or more messages with DEBUG level.
+%     @param varargin The messages to log. Can be strings, numbers, or MException objects.
+%
+%   info(varargin) - Logs one or more messages with INFO level.
+%     @param varargin The messages to log. Can be strings, numbers, or MException objects.
+%
+%   warning(varargin) - Logs one or more messages with WARNING level.
+%     @param varargin The messages to log. Can be strings, numbers, or MException objects.
+%
+%   error(varargin) - Logs one or more messages with ERROR level.
+%     @param varargin The messages to log. Can be strings, numbers, or MException objects.
+%
+%   delete() - Destructor method that closes the file identifier when the logger is deleted.
+%
+% Example Usage:
+%   logger = base_logger.getInstance();
+%   logger.info('Some info')   
+%
+%   try
+%       % some code causing exception
+%   catch err
+%       logger.error('An error occurred:', err);
+%   end
+%
+% See also: fopen, fclose, dbstack, fprintf
+
+classdef base_logger < handle
+    properties(Access=private)
+        fid;
+    end
+    
+    methods(Static, Access = public)
+        function obj = getInstance()
+            persistent instance;
+            if isempty(instance)
+                instance = base_logger();
+            end
+            obj = instance;
+        end
+    end
+
+    methods(Access=private)
+        function this = base_logger()
+            logFileName = getenv("APP_LOG_FILE");
+            if isempty(logFileName)
+                logFileName = 'base-logger-log.log';
+            end
+            this.fid = fopen(logFileName, 'a');
+            if this.fid == -1
+                error('Failed to open log file');
+            end
+        end
+
+        function log(this, level, varargin)
+            current_time = datestr(now, 'yyyy-mm-dd HH:MM:SS');
+            stack = dbstack('-completenames');
+            if length(stack) > 2
+                script_name = stack(3).name;
+            else
+                script_name = 'Unknown';
+            end
+            
+            message = "";
+            for i = 1:numel(varargin)
+                if isa(varargin{i}, 'MException')
+                    message = sprintf('%sError: %s\n', message, varargin{i}.message);
+                    for j = 1:length(varargin{i}.stack)
+                        message = sprintf('%s  at %s (line %d)\n', message, varargin{i}.stack(j).name, varargin{i}.stack(j).line);
+                    end
+                elseif isnumeric(varargin{i}) || isenum(varargin{i}) || islogical(varargin{i})
+                    message = strcat(message, string(varargin{i}));
+                elseif ischar(varargin{i}) || isstring(varargin{i})
+                    message = strcat(message, varargin{i});
+                else
+                    message = strcat(message, 'Unsupported data type');
+                end
+                if i < numel(varargin)
+                    message = strcat(message, ", ");
+                end
+            end
+
+            fprintf(this.fid, '%s %s %s %s\n', current_time, level, script_name, message);
+        end
+    end
+
+    methods(Access=public)
+        function trace(this, varargin)
+            this.log('TRACE', varargin{:});
+        end
+
+        function debug(this, varargin)
+            this.log('DEBUG', varargin{:});
+        end
+
+        function info(this, varargin)
+            this.log('INFO', varargin{:});
+        end
+
+        function warning(this, varargin)
+            this.log('WARNING', varargin{:});
+        end
+
+        function error(this, varargin)
+            this.log('ERROR', varargin{:});
+        end
+
+        function delete(this)
+            if this.fid ~= -1
+                fclose(this.fid);
+            end
+        end
+    end
+end

octave/logging/base_logger.m

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+%
+% -----------------
+% Copyright © 2024 ACK Cyfronet AGH, Poland.
+% -----------------
+%
+% BASE_LOGGER A singleton logger class for logging messages to a file.
+%
+% This class implements a simple logging mechanism with different log levels
+% (TRACE, DEBUG, INFO, WARNING, ERROR) and writes log entries to a file.
+% It follows the Singleton pattern to ensure that only one instance of the logger
+% exists throughout the application.
+%
+% The log file is specified by the environment variable 'APP_LOG_FILE'. If
+% the variable is not set, a default file 'base-logger-log.log' is used.
+%
+% Properties:
+%   fid - (private) The file identifier for the log file. This is used to write logs.
+%
+% Methods:
+%
+%   getInstance() - Retrieves the singleton instance of the logger.
+%
+%   trace(varargin) - Logs one or more messages with TRACE level.
+%     @param varargin The messages to log. Can be strings, numbers, or MException objects.
+%
+%   debug(varargin) - Logs one or more messages with DEBUG level.
+%     @param varargin The messages to log. Can be strings, numbers, or MException objects.
+%
+%   info(varargin) - Logs one or more messages with INFO level.
+%     @param varargin The messages to log. Can be strings, numbers, or MException objects.
+%
+%   warning(varargin) - Logs one or more messages with WARNING level.
+%     @param varargin The messages to log. Can be strings, numbers, or MException objects.
+%
+%   error(varargin) - Logs one or more messages with ERROR level.
+%     @param varargin The messages to log. Can be strings, numbers, or MException objects.
+%
+%   delete() - Destructor method that closes the file identifier when the logger is deleted.
+%
+% Example Usage:
+%   logger = base_logger.getInstance();
+%   logger.info('Some info')   
+%
+%   try
+%       % some code causing exception
+%   catch err
+%       logger.error('An error occurred:', err);
+%   end
+%
+% See also: fopen, fclose, dbstack, fprintf
+
+classdef base_logger < handle
+    properties
+        fid;
+    end
+
+    methods(Static)
+        function obj = getInstance()
+            persistent instance;
+            if isempty(instance)
+                instance = base_logger();
+            end
+            obj = instance;
+        end
+    end
+
+    methods
+        function this = base_logger()
+            logFileName = getenv("APP_LOG_FILE");
+            if isempty(logFileName)
+                logFileName = 'base-logger-log.log';
+            end
+            this.fid = fopen(logFileName, 'a');
+            if this.fid == -1
+                error('Failed to open log file');
+            end
+        end
+
+        function log(this, level, varargin)
+            current_time = strftime('%Y-%m-%d %H:%M:%S', localtime(time()));
+            stack = dbstack('-completenames');
+            if length(stack) > 2
+                script_name = stack(3).name;
+            else
+                script_name = 'Unknown';
+            end
+
+            message = sprintf('');
+            for i = 1:numel(varargin)
+                if isstruct(varargin{i}) && isfield(varargin{i}, 'message') && isfield(varargin{i}, 'stack')
+                    error_info = varargin{i};
+                    message = sprintf('%sError: %s\n', message, error_info.message);
+                    for j = 1:length(error_info.stack)
+                        message = sprintf('%s  at %s (line %d)\n', message, error_info.stack(j).name, error_info.stack(j).line);
+                    end
+                elseif isnumeric(varargin{i}) || islogical(varargin{i})
+                    message = sprintf('%s%s', message, num2str(varargin{i}));
+                elseif ischar(varargin{i}) || isstring(varargin{i})
+                    message = sprintf('%s%s', message, varargin{i});
+                else
+                    message = sprintf('%sUnsupported data type', message);
+                end
+                if i < numel(varargin)
+                    message = sprintf('%s, ', message);
+                end
+            end
+
+            fprintf(this.fid, '%s %s %s %s\n', current_time, level, script_name, message);
+        end
+
+        function trace(this, varargin)
+            this.log('TRACE', varargin{:});
+        end
+
+        function debug(this, varargin)
+            this.log('DEBUG', varargin{:});
+        end
+
+        function info(this, varargin)
+            this.log('INFO', varargin{:});
+        end
+
+        function warning(this, varargin)
+            this.log('WARNING', varargin{:});
+        end
+
+        function error(this, varargin)
+            this.log('ERROR', varargin{:});
+        end
+
+        function delete(this)
+            if this.fid ~= -1
+                fclose(this.fid);
+            end
+        end
+    end
+end

python/logging/base_logger.py

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+#
+# -----------------
+# Copyright © 2024 ACK Cyfronet AGH, Poland.
+# -----------------
+#
+import os
+import logging
+
+def getDefaultLogger(name):
+    """
+    Retrieves or creates a logger with the specified name and sets it up with a file handler.
+    
+    The logger is configured to write log messages to the file path specified by the
+    'APP_LOG_FILE' environment variable. If the environment variable is not set,
+    the logger will write to the file 'base-logger-log.log' in the current
+    working directory. The logger uses the 'INFO' level as the default logging level
+    and writes log entries in the following format:
+    
+    'YYYY-MM-DD HH:MM:SS,ms LEVEL logger_name message'
+    
+    If the logger does not already have handlers, a file handler is created, and the 
+    logging output is appended to the file. The log format includes the timestamp with 
+    milliseconds, log level, logger name, and the log message.
+
+    Parameters:
+    -----------
+    name : str
+        The name of the logger. This can be the name of the module or any identifier 
+        that you want to associate with the logger.
+
+    Returns:
+    --------
+    logger : logging.Logger
+        A logger instance with the specified name. The logger is configured with a 
+        file handler that writes to the file specified by the 'APP_LOG_FILE' 
+        environment variable, or to 'base-logger-log.log' if the environment 
+        variable is not set.
+    
+    Example:
+    --------
+    logger = getDefaultLogger(__name__)
+    logger.info("This is an info message.")
+    try:
+        # some code causing exception
+    except Exception:
+        logger.exception('An error occurred')
+
+    Notes:
+    ------
+    - The 'APP_LOG_FILE' environment variable should specify the full path to the log file.
+    - If 'APP_LOG_FILE' is not set, logs will be written to 'base-logger-log.log'.
+
+    """
+    logger = logging.getLogger(name)
+    if not logger.hasHandlers():
+        file_handler = logging.FileHandler(os.environ.get('APP_LOG_FILE', 'base-logger-log.log'), mode='a')
+        formatter = logging.Formatter('%(asctime)s,%(msecs)d %(levelname)s %(name)s %(message)s')
+        file_handler.setFormatter(formatter)
+        logger.addHandler(file_handler)
+    logger.setLevel(logging.INFO)
+    
+    return logger