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277 lines
11 KiB
C++
277 lines
11 KiB
C++
//
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// FileChannel.h
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//
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// Library: Foundation
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// Package: Logging
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// Module: FileChannel
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//
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// Definition of the FileChannel class.
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//
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// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
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// and Contributors.
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//
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// SPDX-License-Identifier: BSL-1.0
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//
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#ifndef Foundation_FileChannel_INCLUDED
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#define Foundation_FileChannel_INCLUDED
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#include "Poco/Foundation.h"
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#include "Poco/Channel.h"
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#include "Poco/Timestamp.h"
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#include "Poco/Timespan.h"
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#include "Poco/Mutex.h"
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namespace Poco {
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class LogFile;
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class RotateStrategy;
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class ArchiveStrategy;
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class PurgeStrategy;
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class Foundation_API FileChannel: public Channel
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/// A Channel that writes to a file. This class supports
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/// flexible log file rotation and archiving, as well
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/// as automatic purging of archived log files.
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///
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/// Only the message's text is written, followed
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/// by a newline.
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///
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/// Chain this channel to a FormattingChannel with an
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/// appropriate Formatter to control what is in the text.
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///
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/// The FileChannel support log file rotation based
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/// on log file size or time intervals.
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/// Archived log files can be compressed in gzip format.
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/// Older archived files can be automatically deleted
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/// (purged).
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///
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/// The rotation strategy can be specified with the
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/// "rotation" property, which can take one of the
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/// following values:
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///
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/// * never: no log rotation
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/// * [day,][hh]:mm: the file is rotated on specified day/time
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/// day - day is specified as long or short day name (Monday|Mon, Tuesday|Tue, ... );
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/// day can be omitted, in which case log is rotated every day
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/// hh - valid hour range is 00-23;
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/// hour can be omitted, in which case log is rotated every hour
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/// mm - valid minute range is 00-59;
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/// minute must be specified
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/// * daily: the file is rotated daily
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/// * weekly: the file is rotated every seven days
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/// * monthly: the file is rotated every 30 days
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/// * <n> minutes: the file is rotated every <n> minutes,
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/// where <n> is an integer greater than zero.
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/// * <n> hours: the file is rotated every <n> hours, where
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/// <n> is an integer greater than zero.
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/// * <n> days: the file is rotated every <n> days, where
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/// <n> is an integer greater than zero.
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/// * <n> weeks: the file is rotated every <n> weeks, where
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/// <n> is an integer greater than zero.
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/// * <n> months: the file is rotated every <n> months, where
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/// <n> is an integer greater than zero and
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/// a month has 30 days.
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/// * <n>: the file is rotated when its size exceeds
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/// <n> bytes.
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/// * <n> K: the file is rotated when its size exceeds
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/// <n> Kilobytes.
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/// * <n> M: the file is rotated when its size exceeds
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/// <n> Megabytes.
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///
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/// NOTE: For periodic log file rotation (daily, weekly, monthly, etc.),
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/// the date and time of log file creation or last rotation is
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/// written into the first line of the log file. This is because
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/// there is no reliable way to find out the real creation date of
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/// a file on many platforms (e.g., most Unix platforms do not
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/// provide the creation date, and Windows has its own issues
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/// with its "File System Tunneling Capabilities").
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///
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/// Using the "archive" property it is possible to specify
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/// how archived log files are named. The following values
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/// for the "archive" property are supported:
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///
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/// * number: A number, starting with 0, is appended to
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/// the name of archived log files. The newest
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/// archived log file always has the number 0.
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/// For example, if the log file is named
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/// "access.log", and it fulfils the criteria
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/// for rotation, the file is renamed to
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/// "access.log.0". If a file named "access.log.0"
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/// already exists, it is renamed to "access.log.1",
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/// and so on.
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/// * timestamp: A timestamp is appended to the log file name.
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/// For example, if the log file is named
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/// "access.log", and it fulfils the criteria
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/// for rotation, the file is renamed to
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/// "access.log.20050802110300".
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///
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/// Using the "times" property it is possible to specify
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/// time mode for the day/time based rotation. The following values
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/// for the "times" property are supported:
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///
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/// * utc: Rotation strategy is based on UTC time (default).
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/// * local: Rotation strategy is based on local time.
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///
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/// Archived log files can be compressed using the gzip compression
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/// method. Compressing can be controlled with the "compress"
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/// property. The following values for the "compress" property
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/// are supported:
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///
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/// * true: Compress archived log files.
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/// * false: Do not compress archived log files.
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///
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/// Archived log files can be automatically purged, either if
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/// they reach a certain age, or if the number of archived
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/// log files reaches a given maximum number. This is
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/// controlled by the purgeAge and purgeCount properties.
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///
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/// The purgeAge property can have the following values:
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///
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/// * <n> [seconds]: the maximum age is <n> seconds.
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/// * <n> minutes: the maximum age is <n> minutes.
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/// * <n> hours: the maximum age is <n> hours.
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/// * <n> days: the maximum age is <n> days.
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/// * <n> weeks: the maximum age is <n> weeks.
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/// * <n> months: the maximum age is <n> months, where a month has 30 days.
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///
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/// The purgeCount property has an integer value that specifies the maximum number
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/// of archived log files. If the number is exceeded, archived log files are
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/// deleted, starting with the oldest. When "none" or empty string are
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/// supplied, they reset purgeCount to none (no purging).
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///
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/// The flush property specifies whether each log message is flushed
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/// immediately to the log file (which may hurt application performance,
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/// but ensures that everything is in the log in case of a system crash),
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// or whether it's allowed to stay in the system's file buffer for some time.
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/// Valid values are:
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///
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/// * true: Every essages is immediately flushed to the log file (default).
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/// * false: Messages are not immediately flushed to the log file.
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///
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/// The rotateOnOpen property specifies whether an existing log file should be
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/// rotated (and archived) when the channel is opened. Valid values are:
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///
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/// * true: The log file is rotated (and archived) when the channel is opened.
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/// * false: Log messages will be appended to an existing log file,
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/// if it exists (unless other conditions for a rotation are met).
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/// This is the default.
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///
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/// For a more lightweight file channel class, see SimpleFileChannel.
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{
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public:
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FileChannel();
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/// Creates the FileChannel.
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FileChannel(const std::string& path);
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/// Creates the FileChannel for a file with the given path.
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void open();
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/// Opens the FileChannel and creates the log file if necessary.
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void close();
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/// Closes the FileChannel.
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void log(const Message& msg);
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/// Logs the given message to the file.
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void setProperty(const std::string& name, const std::string& value);
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/// Sets the property with the given name.
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///
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/// The following properties are supported:
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/// * path: The log file's path.
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/// * rotation: The log file's rotation mode. See the
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/// FileChannel class for details.
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/// * archive: The log file's archive mode. See the
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/// FileChannel class for details.
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/// * times: The log file's time mode. See the
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/// FileChannel class for details.
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/// * compress: Enable or disable compression of
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/// archived files. See the FileChannel class
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/// for details.
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/// * purgeAge: Maximum age of an archived log file before
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/// it is purged. See the FileChannel class for
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/// details.
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/// * purgeCount: Maximum number of archived log files before
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/// files are purged. See the FileChannel class
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/// for details.
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/// * flush: Specifies whether messages are immediately
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/// flushed to the log file. See the FileChannel class
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/// for details.
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/// * rotateOnOpen: Specifies whether an existing log file should be
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/// rotated and archived when the channel is opened.
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std::string getProperty(const std::string& name) const;
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/// Returns the value of the property with the given name.
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/// See setProperty() for a description of the supported
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/// properties.
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Timestamp creationDate() const;
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/// Returns the log file's creation date.
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UInt64 size() const;
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/// Returns the log file's current size in bytes.
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const std::string& path() const;
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/// Returns the log file's path.
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static const std::string PROP_PATH;
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static const std::string PROP_ROTATION;
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static const std::string PROP_ARCHIVE;
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static const std::string PROP_TIMES;
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static const std::string PROP_COMPRESS;
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static const std::string PROP_STREAMCOMPRESS;
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static const std::string PROP_PURGEAGE;
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static const std::string PROP_PURGECOUNT;
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static const std::string PROP_FLUSH;
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static const std::string PROP_ROTATEONOPEN;
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protected:
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~FileChannel();
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void setRotation(const std::string& rotation);
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void setArchive(const std::string& archive);
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void setCompress(const std::string& compress);
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void setStreamCompress(const std::string& streamCompress);
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void setPurgeAge(const std::string& age);
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void setPurgeCount(const std::string& count);
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void setFlush(const std::string& flush);
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void setRotateOnOpen(const std::string& rotateOnOpen);
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void purge();
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void unsafeOpen();
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private:
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LogFile * newLogFile();
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void archiveCorrupted(const std::string& path);
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bool setNoPurge(const std::string& value);
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int extractDigit(const std::string& value, std::string::const_iterator* nextToDigit = NULL) const;
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void setPurgeStrategy(PurgeStrategy* strategy);
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Timespan::TimeDiff extractFactor(const std::string& value, std::string::const_iterator start) const;
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std::string _path;
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std::string _times;
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std::string _rotation;
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std::string _archive;
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bool _compress;
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bool _streamCompress;
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std::string _purgeAge;
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std::string _purgeCount;
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bool _flush;
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bool _rotateOnOpen;
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LogFile* _pFile;
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RotateStrategy* _pRotateStrategy;
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ArchiveStrategy* _pArchiveStrategy;
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PurgeStrategy* _pPurgeStrategy;
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FastMutex _mutex;
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};
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} // namespace Poco
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#endif // Foundation_FileChannel_INCLUDED
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