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Mole: A flexible operational log analyzer. ========================================== Mole is a log analyzer with parse your logs file (any kind of log), using specified definitions (usually as regular expressions) and magically interpret some fields (numbers, dates ...). Mole provide you a set of functions to analyze that data. Installation ------------ Just as usual for each python package:: pip install mole Getting started --------------- In this example we will use an access log file generated by apache (or any other HTTP server). Let's suppose that this file is located in /var/log/apache/access.log. .. note:: Don't worry about log rotations, mole can handle it. 1. Configure mole ~~~~~~~~~~~~~~~~~ Edit the ``/etc/mole/input.conf``, just adding .. code-block:: ini [apache_log] type = tail source = /var/log/apache/access.log We are defining a new input called *apache_log*, of type tail (that means that we read the new lines in the file when written and handle rotate logs), pointing to our log file in ``/var/log/apache/access.log`` Edit the ``/etc/mole/index.conf``, just adding .. code-block:: ini [apache_log] path = /var/db/mole/apache_log We are defining a new index. The index is the mole database where logs will be stored in a proper format, so we can perform faster searches. 2. Start daemons ~~~~~~~~~~~~~~~~~~~~ .. code-block:: bash $ mole-indexer -C /etc/mole $ mole-seeker -C /etc/mole 3. Enjoy some searches ~~~~~~~~~~~~~~~~~~~~~~ For example, get the top IP addresses which requested more traffic .. code-block:: bash $ mole 'input apache_log | sum bytes by src_ip | top' Understanding Mole Components ----------------------------- The mole pipeline is the responsible to read log items from a source, process then (and transform them if required) and, finally, return an output. If output is not explicitly defined, use the best output format for current console (serialize in network, just an printf in console). .. image:: http://yuml.me/diagram/scruffy;/class/[element]++-0..*%3E[input],%20[element]++-0..*%3E[index],%20[element]++-0..*%3E[parser],%20[index]-%3E[schema] :align: center There are a few components which are interesting to know: **input:** The input are the responsible to read the log source, sources can be of different kinds, such normal files, network stream, index file and so on. **plotter:** The plotter main function is to split the source in logical lines. In a normal log file, each line in log is usually a new log entry, but some other logs could be use a couple of lines to define the same logical entry (i.e. java exceptions are usually in a number of lines). **parser:** Once the logical line is got, you need to known what is the meaning of each field. The parser just assign names to fields using regular expressions for that. **actions:** The actions are transformations, filters and in general any other action to take over the log dataset. **output:** The output just encapsulate the results of the actions in a human (or machine) readable form. You can think the output as some kind of serialization. So, the final pipeline in mole is something like that:: <input> | <plotter> | <parser> | <action> | <action> ... | <output> Daemons ------- Mole is composed by three different daemons (for now): **mole-indexer**: is the responsible to get the log files and index it, using an index back-end (just whoosh right now). **mole-seeker**: is the daemon responsible to lookup into the index, receiving queries using TCP port. **mole**: is the client which can query the mole-seeker. Running ------- To start mole, you need to configure the server. You have an example in the configuration directory of the source code. The configuration directory will contains one file per mole component. Once your server is configured, start both mole-indexer and mole-seeker. Finally perform your query using mole. Configuration ------------- Into the configuration directory, you can find a different file per each mole component, i.e: **input.conf** for configure inputs. An input is a reader over a file, a network stream or everything else that can use to retrieve data to be analyzed. **index.conf** for set up indexes. The indexes are special stpra Examples -------- Count the lines of a input (in this case the input will be an access_log of apache server):: $ mole 'input apache_log | count *' count(*)=3445 Perform the same query, but grouping by source ip:: $ mole 'input apache_log | count * by src_ip' src_ip=127.0.0.1 count=121 src_ip=192.168.0.21 count=1203 Calculate the average transfer size in apache log, sorted by URL and get only the top three:: $ mole 'input apache_log | avg bytes by path | top 3' path=/ avg(bytes)=12343 path=/login avg(bytes)=6737 path=/logout avg(bytes)=2128 Search for an expression and count occurrences:: $ mole 'input apache_log | search path=*login* | count *' count(*)=3838 Development ----------- The Mole code is stored in github_, and you can download it using git, as usual too:: $ git clone git://github.com/ajdiaz/mole .. _github: http://github.com/ajdiaz/mole Design ------ The basic design of mole is a linear pipeline which includes, the following components: * The *input*, is the responsible to read the data source byte-to-byte (or line to line, but it's agnostic to the format). * The *plotter*, which breaks the logical lines of the input. A logical line can be a text line or a number of text lines or a binary block. * The *parser*, is the responsible to get fields into the lines, for example using a regular expression or a comma separated pattern. * The *actions*, which are a number of transformations over the fields. Inputs can be normal files (or tails of files) or special files called "indexes". An index contains the raw data plus time pointer. Bugs, feedbacks, comments et spam --------------------------------- To open bugs or enhanced proposals, please use the `github issues tool`_. If you have any suggestions, do not hesitate to contact me. .. _`github issues tool`: http://github.com/ajdiaz/mole/issues
The source code of the project is managed by git, you can clone it in the usual way:
git clone https://git.ajdiaz.me/mole
A mirror in github is also available, but keep in mind that could be out of date.
If you find any error in the code or incorrect behaviour, please do not hesitate to report it in the devel mailing list: firstname.lastname@example.org.
Please note that you need to subscribe to the list prior to post to avoid spam, just send an empty email to email@example.com with the text subscribe mole-devel in the subject.
Please submit the patches via mailing list. You can read how to in this email + git guide
Any suggestion, discussion or improvement are welcome, just mail to the list!
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IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. 17. Interpretation of Sections 15 and 16. If the disclaimer of warranty and limitation of liability provided above cannot be given local legal effect according to their terms, reviewing courts shall apply local law that most closely approximates an absolute waiver of all civil liability in connection with the Program, unless a warranty or assumption of liability accompanies a copy of the Program in return for a fee. END OF TERMS AND CONDITIONS How to Apply These Terms to Your New Programs If you develop a new program, and you want it to be of the greatest possible use to the public, the best way to achieve this is to make it free software which everyone can redistribute and change under these terms. To do so, attach the following notices to the program. It is safest to attach them to the start of each source file to most effectively state the exclusion of warranty; and each file should have at least the "copyright" line and a pointer to where the full notice is found. <one line to give the program's name and a brief idea of what it does.> Copyright (C) <year> <name of author> This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program. If not, see <http://www.gnu.org/licenses/>. Also add information on how to contact you by electronic and paper mail. If the program does terminal interaction, make it output a short notice like this when it starts in an interactive mode: <program> Copyright (C) <year> <name of author> This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'. This is free software, and you are welcome to redistribute it under certain conditions; type `show c' for details. The hypothetical commands `show w' and `show c' should show the appropriate parts of the General Public License. Of course, your program's commands might be different; for a GUI interface, you would use an "about box". You should also get your employer (if you work as a programmer) or school, if any, to sign a "copyright disclaimer" for the program, if necessary. For more information on this, and how to apply and follow the GNU GPL, see <http://www.gnu.org/licenses/>. The GNU General Public License does not permit incorporating your program into proprietary programs. If your program is a subroutine library, you may consider it more useful to permit linking proprietary applications with the library. If this is what you want to do, use the GNU Lesser General Public License instead of this License. But first, please read <http://www.gnu.org/philosophy/why-not-lgpl.html>.