pyGNMI: Python gNMI client

This repository contains pure Python implementation of the gNMI client to interact with the network functions.

Usage

Sample code example:

# Modules
from pygnmi.client import gNMIclient

# Variables
host = ('169.254.255.64', '57400')

# Body
if __name__ == '__main__':
    with gNMIclient(target=host, username='admin', password='admin', insecure=True) as gc:
         result = gc.get(path=['openconfig-interfaces:interfaces', 'openconfig-acl:acl'])

    print(result)

Also integration with Nornir is supported (refer to examples).

Video tutorial

Watch the detailed explanation how to use pyGNMI in our YouTube channel.

All gNMI RPCs supported

• Capabilities
• Get
• Set
• Subscribe

Supported operation modes

• insecure gRPC channel (without encryption)
• secure gRPC channel (with encryption and authentication based on certificate)

Tested Network Operating Systems (NOS)

• Arista EOS
• Nokia SR OS
• Cisco IOS XR
• Juniper JUNOS
• Nokia SRLinux
• Cisco NX-OS

Network Operating Systems (NOS) in test

• Broadcom SONiC

License

By using the pyGNMI tool you agree with the license.

Contributors

• Anton Karneliuk
• Stefan Lieberth
• Prem Anand Haridoss
• Andrew Southard
• Jeroen van Bemme
• Frédéric Perrin
• Malanovo
• Sebastian Lohff

Dev Log

Release 0.8.14: - Number of minor bug fixes and improvements. - Adding support of prefix to pygnmicli. - Adding error propagation from child thread to main thread <#142> - Changes to u_val <#144> - Adding Master Arbitration support for Set <#146> - Adding bytes_val and leaflist_val with string_val parsing <#151>

Release 0.8.13: - Number of minor bug fixes and improvements.

Release 0.8.12: - Fixed operation of no_qos_marking flag for pygnmicli.

Release 0.8.11: - Previous release introduced break for telemetry in Juniper due to inconsistency of communicated encoudings in Capabilities() and what is really supported in Subscribe().

Release 0.8.10: - Automatic detection of supported encoding and using it where applicable (e.g., in subscribe2 method). - Possibility to remove qos from Subscribe for platforms, which doesn't support it (e.g., Juniper).

Release 0.8.9:

• Default value for encoding everywhere is set to None.
• Method capabilities() now is called as part of connect() to collect supported encoding as part of session establishing.
• If encoding is not specified by user, then it is auto-set based on the list collected via capabilites() with json having the first priority follwed by json_ietf.

Release 0.8.8:

• Added new argument -e / --encoding to pygnmicli to specify the encoding, which overrides the default one. Fix for Issue 58.
• Fixed minor bug with encoding handling inside get() and subscribe2() methods.
• Simplified the code.

Release 0.8.7:

• Fixed bug, when returned json_val or json_ietf_val is not processed correctly if the value is empty string. Fix for Issue 58.

Release 0.8.6:

• Fixed minor issue with establishing insecure channel.
• Fixed bug with inabillity to specify prefix in Subscribe messages for subscribe2() method.
• Important: It is recommended to use method subscribe2() instead of subscribe() for building telemetry collectors with pygnmi as this method is further developed and throroughle tested. The method subscribe() will be deprecated in future releases.
• Functionality qos is now properly supported in subscribe2() method.

Release 0.8.5:

• Fixed some issues with telemetry representation with pygnmicli.

Release 0.8.4:

• Change logic of setting default values for some parameters to improve user experience.
• Added token authentication to pygnmicli.

Release 0.8.3:

• Changed behaviour of subscribe2() to RPC to avoid adding the empty Extension field for no extensions presenting. Fix for Issue 83.
• Uppdated documentation with examples in GitHub.
• Added support of History extensions to pygnmicli.

Release 0.8.2:

• Implemented History Extension.
• Implemented handling of corner case, where --skip-verify was failing trying to parse certificate, which doesn't have CN and SARs.

Release 0.8.1:

• Removed the need for --no-binary=protobuf for operation.

Release 0.8.0:

• Important: potentially breaking change. The dependency is moved from grpcio-tools to protobuf, which as a standalone package has a much newer serion.
• Spec is rebuilt and updated to support gNMI of version 0.8.0.

Release 0.7.5:

• Amended the logic of ONCE telemetry mode to automatically terminate on receiving {"sync_response": True} message.

Release 0.7.4:

• Feature skip_verify is now stabilised and doesn't require subject alternative names any more.

Release 0.7.3:

• Amended the logic of target functionality to be more inline with gNMI Reference.

Release 0.7.2:

• Minor bug fixing in the skip_verify logic. Impotant: for this feature to work, you need at least one subject alternative name filed (DNS, IP address, email, - any will work). It also doesn't matter which value it has, but at least one item shall present.

Release 0.7.1:

• Added new argument skip_verify to gNMIclient, which removes a need to set the override argument manually. However, the latter one still stays for the backward compatibility.
• Changed default values for arguments username and password from None to "", as with token-based authentication they don't need to be specified.
• Added new argument target to gNMIclient.get(), gNMIclient.set(), and gNMIclient.subscribe2() methods. If provided, it adds target key to Path() per GNMI Specification 2.2.2.1.

Release 0.7.0:

• Added authentication with Token using Authorization: Bearer TOKEN, where TOKEN is a variable provided as gNMIclient(token=TOKEN) key (needed for Arista CVP).
• Added functionality to change GRPC_SSL_CIPHER_SUITES dynamically to HIGH value (needed for Nokia SR OS).

Release 0.6.9:

• Adding new documentation for mutual TLS feature.

Release 0.6.8:

• Minor bug-fixing.

Release 0.6.7:

• Added new show_diff key to gNMIclient object (supported values print and get). When applied, it shows the changes happened to all keys following XPath from all arguments to Set() RPC at the network devices. It is so fair tailored to OpenConfig YANG modules as it uses some architectural principles of OpenConfig YANG module to re-construct XPath.
• Added an optional timeout to connect() method.
• Minor bug-fixing.

Release 0.6.6:

• Minor bug-fixing.

Release 0.6.5:

• Implemented prefix and timestamp in SetResponse message.
• Implemented alias and atomic in Notification message.
• Minor bug-fixing.

Release 0.6.4:

• Minor bug-fixing.

Release 0.6.3:

• Implemented prefix key in the Update message.
• Added possibility to provide password in STDIN rather than key.
• Minor bug-fixing.

Release 0.6.2:

• Added support of keepalive timer for gRPC session to prevent automatic closure each 2 hours.
• Fixed issue with Subscribe RPC not sending delete notification in case of a path is removed from the node.
• Added the CLI based tool.
• Minor bug-fixing.

Release 0.6.1:

• Added support of origin per RFC7951.
• Added timeout to the initial setup useful for long-living connections.
• Minor bug-fixing.

Release 0.6.0:

• Significant improvements in telemetry capabilities of the pygnmi. Now you can use subscribe2 method by simply providing the a corredponding dictionary at input and all modes (STREA, ONCE, POLL) are working correctly.
• Function telemetryParser is now automatically used inside subscribe2.
• Telemetry is now implemeted using threading.
• Added new unit tests with pytest and added code coverage with coverage.py.

Release 0.5.3:

• Minor improvements and bug fixing.
• Full coverage of unit tests for all operations (Capabilities, Get, Set(Update, Replace, Delete), Subscribe) and all notations of GNMI Path.

Release 0.5.2:

• Minor bug fixing.
• First release with unit tests.

Release 0.5.1:

• Added example for non-blocking iterator for telemetry.
• Added the extra support for Juniper TLS certificates.
• Fixed regexp warnings.
• Changed the logging functionality.
• Enabled Unix domain socket.
• Added close()
• Many thanks for all contributors to make this release happen.

Release 0.5.0:

• Added possibility to extract certificate from the destination network function.

Release 0.4.8:

• Added documentation in module regading supported the different paths naming conventions. Supported options: yang-module:container/container[key=value], /yang-module:container/container[key=value], /yang-module:/container/container[key=value], /container/container[key=value]

Release 0.4.6:

• Fixed gNMI Path issue.

Release 0.4.6:

• Replaced the sys.exit with raising exceptions.
• Minor bug fix.
• Brought the gNMI path to the canonical format: /origin:element1/element2....
• Added possibility to omit the YANG module name, as some vendors doesn't include that in the request per their gNMI implementation: /element1/element2....

Release 0.4.5:

• Minor bug fix.

Release 0.4.4:

• Minor bug fix.

Release 0.4.3:

• Added possibility to modify the timeout (default value is 5 seconds) for the session using gnmi_timeout key for gNMIclient class.

Release 0.4.2:

• Modified the path generation to comply with gNMI Path encoding conventions.
• Fixed the problem debug output, where the requests where not printed in case of response failing.

Release 0.4.1:

• Minor bug fix.

Release 0.4.0:

• Added support for Juniper JUNOS
• Fixed the issue with override for PKI-based certificates

Release 0.3.12:

• Minor bug fix.

Release 0.3.11:

• Minor bug fix.

Release 0.3.10:

• Renamed the debug mode. Add argument debug=True upon object creation to see the Protobuf messages.

Release 0.3.9:

• Added functionality to list the full the device configuration in case the path is empty: get(path[]).

Release 0.3.8:

• Merged the proposal how to implement TLS with override for Cisco IOS XR (tested for Cisco IOS XR, to be tested for other vendors yet)
• Merged examples with TLS

Release 0.3.7:

• Added the argument encoding as an extra key to Set operation

Release 0.3.6:

• Added the argument encoding to Get operation

Release 0.3.5:

• Added the example for Nornir Integration
• Added the topology diagram
• Added links to the video tutorial

Release 0.3.4:

• Added the close method to gNMIClient class for those, who doesn't use with ... as ... context manager.

Release 0.3.3:

• Added the functionality to pass gRPC messages to the code execution

Release 0.3.2:

• Minor bugs fixed.

Release 0.3.1:

• Minor bugs fixed.
• Added examples of gNMI operations.

Release 0.3.0:

• Added new function telemetryParser, which converts Protobuf messages in Python dictionary.
• Fixed the errors with the telemetry parsing.

Release 0.2.7:

• Modified core so that telemetry is working in once and stream mode.

Release 0.2.6:

• Added alpha version of the Subscribe operation.

Release 0.2.5:

• Added typing hints.

Release 0.2.4:

• Minor bugfixing.

Release 0.2.3:

• Added support for IPv6 transport (now you can connect to the network function over IPv6).

Release 0.2.2:

• Added conversion of the collected information over the gNMI into a Python dictionary for Set operation.

Release 0.2.1:

• Fixing the bugs with improper Protobuf paths generation.
• Now all Set operations (delete, replace, and update) are working properly.

Releast 0.2.0:

• Added the Set operation from gNMI specification.

Releast 0.1.9:

• Added the property datatype='all' to the get() request. The values are per the gNMI specification: all, config, state, operatonal.

Release 0.1.8:

• Added conversion of the collected information over the gNMI into a Python dictionary for Get operation.

Release 0.1.7:

• Changing packages modules.

Release 0.1.6:

• Restructuring internal context.

Release 0.1.5:

• Minor bugfixing.

Release 0.1.4:

• Minor bugfixing.

Release 0.1.3:

• Minor bugfixing.

Release 0.1.2:

• The gNMIClient is recreated as context manger.
• Tests with Nokia SR OS done, the module is working nice for insecure channel.

Release 0.1.1:

• Added the Get operation out of gNMI specification.

Release 0.1.0:

• The first release.

(c)2020-2022, karneliuk.com