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Misc. basic stuff needed by RSCs tools

Project description

The library includes various utility modules used in other projects.

  • ast_call: A simple call manager using asterisk: This can be used to originate a call and log all event associated to that call. So you can find out the status of the call and optionally the dialstatus.
  • ast_cdr: parser for CDR records in asterisk. We currently use text-files only, this might be later extended for database use.
  • Autosuper magic (originally from Guido van Rossums announcement of Python 2.2): For refactoring it’s a good idea that each class knows its parents (that the parent is not hardcoded in the upcall), achieved by adding a the __super attribute. Use as, e.g., self.__super.method for calling method in the parent.
  • bero: A configurator for the bero*fos failover switch. See my blogpost why I wrote that (short summary: to work around bugs in the firmware of the device which are not addressed by the configurator code that comes with the device).
  • Config_File for python-syntax configuration files used in several of my projects.
  • execute: module for executing commands and handling IO, this also has a Lock and a Log mixin. Now there is also a framework for executing processes in a pipeline, there can be fork-points in the pipeline where the output of one process feeds several pipelines. See and
  • ETree: wrapper around ElementTree for pretty-printing and xml export. This uses delegation (not inheritance) because we can’t seem to inherit from ElementTree.
  • Firstname: given a string-candidate of a first name, check with popular web-site if it is really considered a first name.
  • Freshmeat: Get project and release information via the REST API. Also support submit of a new release. I’m now using this for announcing new releases for my projects.
  • grepmime: search for pattern in email attachments (even if these are encoded)
  • HTML_Parse for opening and parsing URLs
  • inductance: Inductance calculation of air-cored cylindrical flat-winded coil according to Robert Weaver
  • IP4_Address: IP v4 Addresses with subnet masking
  • iter_recipes: magic with iterators
  • lcr: model the status of Linux Call Router ISDN lines.
  • ldap_lib: some routines for common ldap tasks including an iterator for LDAP implementations that use paged search (notably active directory).
  • Math implements Euclids algorithm for greatest common divisor and as a by-product the least common multiple
  • nmap: A parser for output of nmap scans to (e.g. to generate tables in TeX)
  • ocf: small framework for writing OCF scripts for the heartbeat cluster resource manager (probably also usable for the newer version called pacemaker but for now only tested with the version in Debian stable aka lenny).
  • PDF_Parse for opening and parsing PDFs, needs pdftotext installed
  • PDF_Signature: experimental code for checking signatures on adobe PDF documents
  • PM_Value: Possibly missing value, encapsulate a number which may be missing and associated arithmetics.
  • Rational: Implementation of Rational numbers
  • stateparser: Simple state-machine parser class
  • timeout: A simple timeout mechanism using SIGALRM
  • Tex_CSV_Writer: Write CVS files in a syntax that can be parsed by TeX. Implements same interface as the csv module. Only implements writing.
  • trafficshape: Simple traffic shaping configuration: Currently generates Linux tc commands for a traffic shaping config using hfsc for shaping and sfq or red for the leaf qdiscs. We also provide a translator from iptables mangle rules (for traffic marking) to tc commands for filtering. This is needed if we want to do inbound shaping. The Linux kernel doesn’t support inbound shaping, so we need to redirect all traffic to an ifb device. On that device we do outbound shaping. Unfortunately when sending traffic to an ifb device with a tc filter + action mirred command this occurs before the PREROUTING chain. This means packets are not yet marked. So we provide a parser to translate mangle rules in the PREROUTING chain to appropriate tc commands. For implementing this we mark packets (using the tc action ipt for iptables marking) in the original device and then use the marked information in the ifb device to send the traffic to appropriate qdiscs. This supports a two-level approach: Rules in iptables that match on a packet mark (using –mark) are translated to tc commands in the ifb device (they depend on the mark already present). All other rules are translated to a tc action ipt (using -j MARK) and a tc action mirred redirect (for sending the traffic to the ifb device) for the original device (e.g. eth0 redirecting to ifb0). The PREROUTING commands by default are directly taken from the running kernel by default (using “iptables -t mangle -S -v”)


Download the source at and install using the standard python setup, e.g.:

python install --prefix=/usr/local


Version 0.22: Minor feature enhancements

Allow unicode ip address input, hopefully make rsclib installable via pip.

  • Address given to IP4_Address constructor now may be unicode
  • Add download_url to to make installable via pip

Version 0.21: Minor feature enhancements

Fix autosuper: allow to inherit from non-autosuper classes, some small fixes to ast_call and lcr parser. Fix ETree pretty-printing. Update Freshmeat to new hostname. Add dotted netmaks parsing to IP4_Address.

  • Since python2.6 constructor of “object” do not allow parameters, so we need to strip these when doing the upcall from autosuper. This fails when e.g. inheriting from a non-autosuper enabled class, e.g., class (With_Autosuper, dict) in that case dict would get empty parameters. New implementation finds out if our upcall is to “object”, only in that case strip parameters.
  • ast_call now processes all queued unhandled events when a call is matched.
  • update regression test for ast_call.Call
  • lcr parser: fix regex, port can have an empty name.
  • Optimize call matching in ast_call: mark call as closed once we are sure about the uniqueid. Add matching of Account-Code.
  • Fix ETree pretty-printing: don’t print unicode strings when arguments are already converted
  • now is (and the API redirects there), update to new hostname (including .netrc credentials with compatibility for old name).
  • explicit mask paramter of IP4_Address can now be a dotted netmask.

Version 0.20: Not announced on freshmeat

Database value output for ast_cdr, added inductance calculation.

  • ast_cdr: Add methods for database values of CDR records – database values of CDRs are different, they don’t include start, end, answer time-stamps but instead only a calldate, in addition the amaflags are numerical in the database.
  • added inductance calculation

Version 0.19: Not announced on freshmeat

Extend ETree with a walk method and implement small ldap library

  • ETree: add walk method to walk the tree and call an optional pre- and post-hook function
  • ldap_lib: common ldap tasks for user and group search, and an iterator for paged search (used with active directory).

Version 0.18: Not announced on freshmeat

Bugfix of ast_call and update for asterisk 1.6, small extension to IP4_Address.

  • ast_call: match calls via (unique) account code
  • ast_call: State vs ChannelState parameter in Newstate event
  • ast_call: handle immediate error from asterisk (e.g. Permission Denied)
  • IP4_Address: add netblk (start and end address for address with netmask)

Version 0.17: Not announced on freshmeat

Factor ETree (extended ElementTree) from HTML_Parse. New Freshmeat module to get project information and submit new releases via the new freshmeat REST API. New simple hexdump module.

  • New (extended ElementTree)
  • New
  • New
  • adapt lcr module to new version of Linux Call Router

Version 0.16: Not announced on freshmeat

Add an iptables to tc translator for translating mangle rules in the iptables PREROUTING chain to appropriate tc commands (using an ipt action and mirred redirect actions).

  • Add iptables to tc translator to

Version 0.15: Not announced on freshmeat

Add a framework for traffic shaping with linux iproute (tc). Minor updates to iter_recipes.

  • Initial implementation of
  • Add iter_recipes.combinations from python2.6 manpage of itertools for backward compatibility

Version 0.14: Not announced on freshmeat

Add a framework for process pipeline execution, processes can either be python methods or external programs (with parameter list). They can be connected in a pipe and there may be T-points in the pipe, where the pipe forks into two or more pipelines fed by the output of one process.

  • Add process pipeline framework
  • HTML_Parse now has an explicit translate hook for preprocessing the html page before parsing it. This defaults to the old behaviour of filtering out common characters in broken HTML.
  • Add nmap parser (e.g. to generate TeX tables from an nmap scan)
  • Fix Lock_Mixin in execute module to remove lockfile at exit, this used to rely on __del__ which breaks in certain cases.
  • add file upload to HTML_Parse

Version 0.13: Not announced on freshmeat

Bug-Fix Release: Fix signal handler in

  • fix signal handler

Version 0.12: Not announced on freshmeat

Add a simple timeout mechanism using SIGALRM.

  • add

Version 0.11: Not announced on freshmeat

Add a parser for CDR records in asterisk. We currently use text-files only, this might be later extended for database use. Some fixes for ast_call, make call-handling more robust (some race conditions would identify events of other calls as belonging to our initiated call). Add an execute module for executing commands and handling IO, this also has a Lock and a Log mixin. Add, a small framework for writing OCF scripts for the heartbeat cluster resource manager (probably also usable for the newer version called pacemaker but for now only tested with the version in Debian stable aka lenny). Add to model the status of Linux Call Router ISDN lines.

  • add
  • fix
  • fix up-chaining in
  • add
  • add
  • add

Version 0.10: Not announced on freshmeat

add ast_call for asterisk auto-dialling, small fixes to IP4_Address, add bero*fos configurator, experimental code for checking PDF signature

  • add
  • Firstname: don’t look up names with len < 2
  • IP4_Address: some aliases for common functions
  • IP4_Address: add __cmp__
  • bero*fos configurator
  • HTML_Parse updated for python 2.5
  • stateparser update: use self.matrix by default
  • PDF_Signature: experimental code for checking signatures on adobe PDF documents
  • iter_recipes: some magic with iterators

Version 0.9: Not announced on freshmeat

Add binom to the Math package, add Firstname, Bug-Fix Release Rational

  • binom (n, m) computes the binomial coefficient of n, m.
  • Firstname: check if candidate is a first name candidate according to popular web site.
  • Rational: On division we could get a negative denominator – fixed
  • make Config_File a descendent of autosuper

Version 0.8: Not announced on freshmeat

Added more documentation. State-machine parser stateparser implemented. Rational number arithmetic package added.

  • stateparser implemented (simple state-machine line-oriented configurable parser)
  • usage-example of IP4_Address prints debian /etc/network/interfaces entry.
  • Math added (Euclids algorithm, gcd, lcm)
  • Rational number arithmetics
  • cookie processing for HTML_Parse
  • basic HTML auth for HTML_Parse
  • HTML_Parse: move to urllib2

Version 0.7: Not announced on freshmeat

Small Python library with various things such as Configuration file parsing (in Python syntax), HTML and PDF parsing.

  • First Release version

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