gosnmptrapspython 1.0.0
gosnmp-traps-python
This library binds our fork of gosnmp for use in Python3
using gopy.
Versions
All versions 1.0.0 and up support Python 3 only! If you need Python 2 support, check out the following:
https://github.com/ftpsolutions/gosnmp-traps-python/tree/v0.91
https://pypi.org/project/gosnmp-traps-python/0.91/
Concept
In the early days gopy was fairly limited in it's ability to track object allocation across the border of Go and Python.
As a result, our implementation is fairly naive- we only pass primitive types from Go to Python (nothing that comes by reference).
Session are managed entirely on the Go side and identified with an integer- here are a few function signatures to demonstrate:
NewRPCSession(hostname string, port, timeout int, paramsJSON string) (uint64, error)
RPCConnect(sessionID uint64) error
RPCGetNoWait(sessionID uint64) (string, error)
RPCClose(sessionID uint64)
The functions that return complex data do so in a special JSON-based format- at this point gopy does it's magic and those functions are
made available to Python.
We then have RPCSession abstraction on the Python side that pulls things together in a class for convenience (saving you need the to keep
track of the identifiers and handling deserialisation).
Weird gotchas
We're building for Python3 and we use a python-config script for Python3 however we're using a python.pc file from Python2.
I dunno why this has to be this way, but it's the only way I can get the C Python API GIL lock/unlock calls to be available to
Go (C.PyEval_SaveThread() and C.PyEval_RestoreThread(tState)).
So if you're wondering why Python2 still comes into it here and there- that's why. Doesn't seem to cause any problems.
Prerequisites
MacOS
CPython3.8+
virtualenv
pip install virtualenv
pkgconfig
brew install pkg-config
Docker
Install (from PyPI)
python -m pip install gosnmp-traps-python
Setup
virtualenv -p $(which python3) venv
source venv/bin/activate
./fix_venv.sh
pip install -r requirements-dev.txt
Build
source venv/bin/activate
./native_build.sh
If you're deep in the grind and want to iterate faster, you can invoke:
./native_build.sh fast
This skips the setup (assuming you've already done that).
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