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A webapp to query fedmsg history

Project description


A webapp to retrieve historical information about messages on the `fedmsg
<>`_ bus. It is a JSON api for the `datanommer
<>`_ message store.

Production Instance

Hacking on datagrepper

Setting up the stack

Use a virtualenv::

$ mkvirtualenv datagrepper
$ workon datagrepper

Install dependencies::

$ pip install -r requirements.txt
$ pip install psycopg2

Set up the fedmsg consumer for the job runner::

$ python develop

Configuring Postgresql (and getting some data)

In normal operations, the `datanommer
<>`_ consumer daemon will be
running somewhere and continuously stuff each new `fedmsg
<>`_ message that it sees into a postgres DB. If you're
just sitting down to hack on datagrepper, that won't be your situation
so you'll need a dump of the database.

.. note:: If you've tried installing postgres before and think you've
messed it up, you'll need to blow away the old databases with
``$ rm -rf /var/lib/pgsql``

Install postgres (and fedmsg, while we're at it)::

$ sudo yum install -y postgresql-server fedmsg
$ sudo postgresql-setup initdb

Make sure postgres is set to allow connections over tcp/ip using password
authentication. Edit the ``/var/lib/pgsql/data/pg_hba.conf``. You might
find a line like this::

host all all ident

Instead of that line, you need one that looks like this::

host all all md5


Become yourself again (not the ``postgres`` user) and start up postgres::

$ sudo systemctl restart postgresql.service

Become the postgres user (again) and run the psql command. Use that psql
shell to setup the DB, the user, and privileges::

$ sudo su - postgres
$ psql
# create database datanommer;
# create user datanommer with password 'bunbunbun';
# grant all privileges on database datanommer to datanommer;
# \q

Back in the bash shell (but still as the `postgres` user), grab a DB dump and
restore it::

$ wget
$ xzcat datanommer-2014-01-31.dump.xz | psql datanommer

Last step, run datagrepper

You have to configure your development datagrepper instance to talk to
postgres (by default, it looks for a sqlite database). Edit
``fedmsg.d/`` and give it these contents:

.. code-block:: python

config = {
'datanommer.enabled': False,
'datanommer.sqlalchemy.url': 'postgresql+psycopg2://datanommer:bunbunbun@localhost:5432/datanommer',
'fedmsg.consumers.datagrepper-runner.enabled': True,

As your normal old user self, run the development server::

$ workon datagrepper
$ python

In a browser, visit http://localhost:5000 to see the docs.

You can quick test that you can get data by running::

$ sudo yum install -y httpie
$ http get localhost:5000/raw/ delta==1000000 rows_per_page==1

Running the job runner

Without starting ``fedmsg-hub``, the job runner won't actually run jobs::

$ workon datagrepper
$ fedmsg-hub

Project details

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Filename, size & hash SHA256 hash help File type Python version Upload date
datagrepper-0.3.1.tar.gz (110.3 kB) Copy SHA256 hash SHA256 Source None Feb 9, 2014

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