Elevated Privileges for Python3 Libraries

Question

We are stuck trying to recreate some of the metrics we collect in our current Python2 snippets using pipes.

The specific example is 'ping', which required subprocesses, no longer allowed. We don't believe latency_ping,avail_ping from silo_tools will let us collect packet_count, packet_loss, avg_latencies, latencies that a library like ping3 allows. (used to calculate jitter and else)

Some of the libraries seem to require raw sockets and/or elevated privileges. So our question is two fold.

1 - Can we import custom libraries such as Ping3?

2 - How do we use elevated privileges on the collectors, as some libraries require elevated priveleges?

Thanks in advance, Dan

matth · Accepted Answer

Dan,
I can address the first question. You should be able to pull in that ping3 wheel/library using these instructions:&nbsp;https://docs.sciencelogic.com/latest/Content/Web_Content_Dev_and_Integration/ScienceLogic_Libraries/chapter_02_managing_libraries.htm?Highlight=science%20logic%20library#manually-building-a-sciencelogic-library
That library is fairly simple to pull in because it doesn't require to be compiled and it has no other dependent libraries or wheels. The instructions should boil down:

Saving that wheel from pypi
Creating a metadata.json file describing the library and the wheels is contained in the SL library (see below)
Creating a tar file that contains the wheel(s) and the metadata.json file.

Your metadata.json should look like this...
{
    "meta_version": "0.2",
    "fields": {
        "description": "Ping3 Library",
        "manifest": [
            "ping3-4.0.8-py3-none-any.whl"
        ],
        "name": "ping3",
        "type": "py_package",
        "version": "4.0.8",
        "requires_python": "&gt;=3.5"
    }
}
From there you should be able to import and align the SL library into your SL1.
Your tar file listing should look like this...
[workspace]# tar tvf ping3+4.0.8.py36.tar
-rw-r--r-- root/root       287 2024-06-20 13:35 metadata.json
-rw-r--r-- root/root     14007 2024-06-20 13:33 ping3-4.0.8-py3-none-any.whl
Some gotchas is that you need to prepare the SL library on an OracleLinux or RedHat variant.
Hope that helps and let me know how it goes!
&nbsp;

matth · Answer

With Low-code you can still write custom python functions and add those steps in as needed. But in your case it might be easier to run ping from the command line and then run one of our OOTB steps like the&nbsp;jc parser. Note there is also a regex step if you wanted to use that too.So to get mdev, your Snippet Argument might look like this
low_code:
  version: 2
  steps:
    - ssh: 'ping -c 5 "google.com"'
    - jc: ping
And my output looks like this...
{'data_bytes': 56,
 'destination': 'google.com',
 'destination_ip': '142.251.163.100',
 'duplicates': 0,
 'packet_loss_percent': 0.0,
 'packets_received': 5,
 'packets_transmitted': 5,
 'pattern': None,
 'responses': [{'bytes': 64,
                'duplicate': False,
                'icmp_seq': 1,
                'response_ip': '142.251.163.100',
                'time_ms': 1.9,
                'timestamp': None,
                'ttl': 57,
                'type': 'reply'},
               {'bytes': 64,
                'duplicate': False,
                'icmp_seq': 2,
                'response_ip': '142.251.163.100',
                'time_ms': 2.98,
                'timestamp': None,
                'ttl': 57,
                'type': 'reply'},
               {'bytes': 64,
                'duplicate': False,
                'icmp_seq': 3,
                'response_ip': '142.251.163.100',
                'time_ms': 15.5,
                'timestamp': None,
                'ttl': 57,
                'type': 'reply'},
               {'bytes': 64,
                'duplicate': False,
                'icmp_seq': 4,
                'response_ip': '142.251.163.100',
                'time_ms': 15.7,
                'timestamp': None,
                'ttl': 57,
                'type': 'reply'},
               {'bytes': 64,
                'duplicate': False,
                'icmp_seq': 5,
                'response_ip': '142.251.163.100',
                'time_ms': 16.7,
                'timestamp': None,
                'ttl': 57,
                'type': 'reply'}],
 'round_trip_ms_avg': 10.577,
 'round_trip_ms_max': 16.707,
 'round_trip_ms_min': 1.9,
 'round_trip_ms_stddev': 6.665,
 'time_ms': 4006.0}
Then I would use a selector like jmespath to pull out the round trip stddev value like this
low_code:
  version: 2
  steps:
    - ssh: 'ping -c 5 "google.com"'
    - jc: ping
    - jmespath:
        value: "round_trip_ms_stddev"
If you are looking to make a custom step that calculates stddev then you will need to add something like this into your snippet.
import statistics

@register_processor
def calc_stddev(result):
    return statistics.stdev(result)
your Snippet Argument should look like this
low_code:
  version: 2
  steps:
    - ssh: 'ping -c 5 "google.com"'
    - jc: ping
    - jmespath:
        value: "responses[*].time_ms"
    - calc_stddev
&nbsp;

matth · Answer

You will want to make sure that your Dynamic Application is aligned to the `Low-code Tools v101` Execution Environment and that you have your collection objects aligned to our default snippet. For reference, you can look at the "Accounts Performance" Dynamic Application that is shipped with the toolkit.

matth · Answer

You would align a SSH credential to your Dynamic Application. Our framework powering the Low-code Toolkit handles triggering the SSH connection using your credentials be it a password or passkey.

danbuck · Answer

That does help, we will give that a shot. TY!

ishanc · Answer

I tried, it's the same permission problem. Needs elevated permission to create sockets since ping3 uses that.

Error encountered while executing snippet. Error explanation: App: 2025, Snippet: 2384 threw exception: [Errno 13] Permission denied (PermissionError: [Errno 13] Permission denied _socket.socket.__init__(self, family, type, proto, fileno))

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