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Asynchronous: Twisted
=====================
`Twisted <http://twistedmatrix.com>`_ is quite old and widly used
I/O framework. With Twisted, your code will mostly live in isolated
functions, but unlike as it is with callback-based design, with Twisted
work-in-progress is represented by a
:class:`~twisted.internet.defer.Deferred` class instance effectively
carrying state and context of running operation. Your callback functions
will be attached to these *Deferred* objects and invoked as *Deferred*
is done.
Based on *Twisted* infrastructure, individual asynchronous functions
could be chained to run sequentially or in parallel.
In most examples approximate analogues of well known Net-SNMP snmp* tools
command line options are shown. That may help those readers who, by chance
are familiar with Net-SNMP tools, better understanding what example code doe
Here's a quick example on a simple SNMP GET by high-level API:
.. include:: /../../examples/hlapi/twisted/manager/cmdgen/v1-get.py
:start-after: options:
:end-before: Functionally
.. literalinclude:: /../../examples/hlapi/twisted/manager/cmdgen/v1-get.py
:start-after: """#
:language: python
To make use of SNMPv3 and USM, the following code performs a series of
SNMP GETNEXT operations effectively fetching a table of SNMP variables
from SNMP Agent:
.. include:: /../../examples/hlapi/twisted/manager/cmdgen/getbulk-to-eom.py
:start-after: options:
:end-before: Functionally
.. literalinclude:: /../../examples/hlapi/twisted/manager/cmdgen/getbulk-to-eom.py
:start-after: """#
:language: python
More examples on Command Generator API usage follow.
.. toctree::
/examples/hlapi/twisted/manager/cmdgen/snmp-versions
/examples/hlapi/twisted/manager/cmdgen/walking-operations
/examples/hlapi/twisted/manager/cmdgen/transport-tweaks
/examples/hlapi/twisted/manager/cmdgen/advanced-topics
Sending SNMP TRAP's and INFORM's is as easy with PySNMP library.
The following code sends SNMP TRAP:
.. include:: /../../examples/hlapi/twisted/agent/ntforg/default-v1-trap.py
:start-after: options:
:end-before: Functionally
.. literalinclude:: /../../examples/hlapi/twisted/agent/ntforg/default-v1-trap.py
:start-after: """#
:language: python
More examples on Notification Originator API usage follow.
.. toctree::
/examples/hlapi/twisted/agent/ntforg/common-notifications
/examples/hlapi/twisted/agent/ntforg/advanced-topics
More sophisticated or less popular SNMP operations can still be performed
with PySNMP through its Native API to Standard SNMP Applications.
|
