Events-log4j-parser: Difference between revisions
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=Overview= | =Overview= | ||
A library that produces timed events from log4j logs. | |||
=GitHub= | =GitHub= | ||
{{External|https://github.com/NovaOrdis/events- | {{External|https://github.com/NovaOrdis/events-log4j-parser}} | ||
=Installation= | |||
Installs as a command line utility lg-<version>.zip. | |||
=TODO= | =TODO= | ||
./doc/Events | ./doc/Events log4j Parser TODO.docx. | ||
=Usage= | |||
lg [''[[Events-api_Concepts#Query|query]]''] [''[[#Expected_Log_Format_Specification|expected-log-format]]''] [''command''] [''command options''] <log-file1> [log-file2 ...] | |||
The command is optional. | |||
When the command is missing, the implied command is "output", which works as described here: {{Internal|Events-processing output|output}} | |||
Unless output filtering options are used, the events are displayed in their raw format, which is how they appear in the original log. | |||
Commands: | |||
* help | |||
* version | |||
* [[Events-processing output|output]] | |||
* [[Events-processing#describe|describe]] - displays a description of the events produced as the result of the parsing. | |||
* [[Events-processing time-gaps#Overview|time-gaps]] - identify time gaps in the log | |||
* [[Events-processing#count|count]] (-c) - display the number of events that match the query. | |||
* [[Events-processing exclude#Overview|exclude]] (-x) - filter out the events that match the query, and only display those that do not match. This command is equivalent with the grep --invert-match (-v) option. | |||
For more details about commands (procedures), see: {{Internal|Events-processing|Events Processing (events-processing)}} | |||
==Expected Log Format Specification== | |||
The parser may be configured to expect a specific log4j format - or what log4j names [http://logging.apache.org/log4j/2.x/manual/layouts.html#PatternLayout layout]. The specification of the format, expressed in the same way a log4j configuration would, will be used to parse the file. | |||
The expected log format specification is optional. If not provided, heuristic rules are used to parse the file, but the results may be not what you expect, if the heuristics fails. | |||
If the expected log format specification is provided, it should be the exact [http://logging.apache.org/log4j/2.x/manual/layouts.html#PatternLayout log4j pattern layout string] that otherwise would be used in the log4j configuration file. The format specification string must be enclosed in single quotes, to avoid various bash command line expansions. If the parser realizes that the log file content does not match the provided format specification, the parser will fail. | |||
-f '''log4j-format-string''' | --format='''log4j-format-string''' | |||
Example: | |||
-f '%d{HH:mm:ss,SSS} %-5p [%c] (%t) %s%E%n' | |||
{{Warn|If the log4j format string that configured the Java runtime that produced the log is available, it should be as simple as copying an pasting the format in the command line, enclose it within single quotes and run the parser.}} | |||
==Query Syntax== | |||
The query is optional, If specified, it must follow the syntax described here: {{Internal|Events-api_Concepts#Query|Queries}} | |||
Latest revision as of 15:31, 28 October 2017
Internal
Overview
A library that produces timed events from log4j logs.
GitHub
Installation
Installs as a command line utility lg-<version>.zip.
TODO
./doc/Events log4j Parser TODO.docx.
Usage
lg [query] [expected-log-format] [command] [command options] <log-file1> [log-file2 ...]
The command is optional.
When the command is missing, the implied command is "output", which works as described here:
Unless output filtering options are used, the events are displayed in their raw format, which is how they appear in the original log.
Commands:
- help
- version
- output
- describe - displays a description of the events produced as the result of the parsing.
- time-gaps - identify time gaps in the log
- count (-c) - display the number of events that match the query.
- exclude (-x) - filter out the events that match the query, and only display those that do not match. This command is equivalent with the grep --invert-match (-v) option.
For more details about commands (procedures), see:
Expected Log Format Specification
The parser may be configured to expect a specific log4j format - or what log4j names layout. The specification of the format, expressed in the same way a log4j configuration would, will be used to parse the file.
The expected log format specification is optional. If not provided, heuristic rules are used to parse the file, but the results may be not what you expect, if the heuristics fails.
If the expected log format specification is provided, it should be the exact log4j pattern layout string that otherwise would be used in the log4j configuration file. The format specification string must be enclosed in single quotes, to avoid various bash command line expansions. If the parser realizes that the log file content does not match the provided format specification, the parser will fail.
-f 'log4j-format-string' | --format='log4j-format-string'
Example:
-f '%d{HH:mm:ss,SSS} %-5p [%c] (%t) %s%E%n'
If the log4j format string that configured the Java runtime that produced the log is available, it should be as simple as copying an pasting the format in the command line, enclose it within single quotes and run the parser.
Query Syntax
The query is optional, If specified, it must follow the syntax described here: