Databot
High Performance Python Data driven programming framework for Web Crawler,ETL,Data pipeline work.
- Data-driven programming framework
- Paralleled in coroutines and ThreadPool
- Type- and content-based route function
Installing
Install and update using pip:
pip install -U databot
What's data-driven programming?
All functions are connected by pipes (queues) and communicate by data.
When data come in, the function will be called and return the result.
Think about the pipeline operation in unix: ls|grep|sed
.
Benefits:
. Decouple data and functionality
. Easy to reuse
Databot provides pipe and route. It makes data-driven programming and powerful data flow processes easier.
Databot is...
- Simple
Databot is easy to use and maintain, does not need configuration files, and knows about asyncio
and how to parallelize computation.
Here's one of the simple applications you can make:
Load the price of Bitoin every 2 seconds. Advantage price aggregator sample can be found here <https://github.com/kkyon/databot/tree/master/examples>
.
.. code-block:: python
from databot.flow import Pipe, Timer
from databot.botframe import BotFrame
from databot.http.http import HttpLoader
def main():
Pipe(
Timer(delay=2),#send timer data to pipe every 2 sen
"http://api.coindesk.com/v1/bpi/currentprice.json", #send url to pipe when timer trigger
HttpLoader(),#read url and load http response
lambda r:r.json['bpi']['USD']['rate_float'], #read http response and parse as json
print, #print out
)
BotFrame.render('simple_bitcoin_price')
BotFrame.run()
main()
-
flow graph
below is the flow graph generated by databot. -
Fast
Nodes will be run in parallel, and they will perform well when processing stream data. -
Visualization
With render function:
BotFrame.render('bitcoin_arbitrage')
databot will render the data flow network into a graphviz image.
https://github.com/kkyon/databot/blob/master/examples/bitcoin_arbitrage.png
- Replay-able
With replay mode enabled:
config.replay_mode=True
when an exception is raised at step N, you don't need to run from setup 1 to N.
Databot will replay the data from nearest completed node, usually step N-1.
It will save a lot of time in the development phase.