Parser and JSON-RPC proxy for MPEx
Python
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.gitignore
README.md
agent.py
mpex.py
pyparse.py
sample.py
setup.py

README.md

MPExAgent

It allows you to access MPEx by any JSONRPC-capable application, from local or remote machine. MPEx replies for all supported commands are extracted and parsed into easily processable form. It is based on Twisted engine, so it should handle any reasonable volume.

Warning: This MPExAgent version does not support any authentication! Anyone who has access to the listening port, can freely issue MPEx commands in your name. Try it only behind firewall. Patches to support HTTP authentication (should not be hard to add, twisted supports it) or other means are welcome.

Install/usage

Dependencies:

  • python_gnupg
  • Twisted
  • DateUtils
  • pyparsing
  • jsonrpc

If using virtualenv, this will install them all:

easy_install python_gnupg Twisted DateUtils pyparsing jsonrpc

Was used only under Python 2.7, most likely will not work under Python 3.

Using only the parser

Use process* functions in agent.py to parse decrypted MPEx output string to structured data.

Running the agent

It is based on pyMPEx and expects/uses current user's default GPG key set up in exactly the same way. If you are successfully using pyMPEx, the agent should work out of the box.

HTTP/JSONRPC listening port is set by -p commandline switch, if omitted, default port is 8007. Path for JSONRPC calls is /jsonrpc .

Run agent.py . It will ask for your GPG passphrase. While it is running, the passphrase will stay cached in memory. It keeps running in foreground, daemon mode is not supported yet. It logs everything into mpexagent.log file in current directory, using python logging standard library.

Accessing the agent

The listening port is configured above, and default path for submitting JSONRPC calls is /jsonrpc .

Using Python : see sample.py

Input/Output format

Output data structure for all supported commands is documented in MPExAgent methods in agent.py. Supported functions are at the moment (lowercase):

  • stat
  • statjson
  • deposit
  • neworder
  • exercise
  • cancel

With exception of neworder, the functions accept exactly the same arguments in same order as their MPEx counterparts. neworder has first parameter 'B' or 'S' to indicate order type, following parameters are the same as MPEx BUY/SELL command but expiry parameter is not supported.

To ease JSON processing, following minor updates are done to output data:

  • all bitcoin amounts are converted to satoshi to avoid floating point conversion/rounding. (FYI: Bitcoind RPC solves this by parsing all numbers into Decimals, but this requires customized JSON parser at the receiving side, that isn't always practical.)
  • all dates are converted into strings using ISO format (using isoformat()). sampleclient.py converts them back to Python dates in deserializeStat().

As MPEx now offers STATJSON call, stat is deprecated and will be removed. The statjson function improves original data structure for easier processing:

  • all integers come wrapped as strings, statjson unwraps them
  • Holdings and Book are converted into proper dicts, so you can access balances/orders like data["Holdings"]["CxBTC"] instead of iterating whole list.