SyntaxError in the example code in readme

[mstfdkmn]

• main
• 4-3-stable

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It appears the exception syntax in the following line is incorrect: https://github.com/irods/irods_rule_engine_plugin_python/blob/main/README.md?plain=1#L156

When I modified it to except Exception as e:, the check_err function didn’t work as expected.

[alanking]

Good find. To be more specific, here's the Python stacktrace I got when running this against 4.3.3.0 / 4.3.3 on Ubuntu 22.04 (python 3.10.12):

Traceback (most recent call last):
  File \"/etc/irods/core.py\", line 8, in testRule
    if check_err(e, USER_FILE_DOES_NOT_EXIST):
  File \"/etc/irods/core.py\", line 3, in <lambda>
    check_err = lambda e,errcode: e.message.startswith('[iRods__Error__Code:{}]'.format(errcode))
AttributeError: 'RuntimeError' object has no attribute 'message'

A RuntimeError is being raised and RuntimeError does not have a message attribute.

In addition to fixing the SyntaxError, I made the following adjustment to the example rule and got the expected output:

3c3
<   check_err = lambda e,errcode: e.message.startswith('[iRods__Error__Code:{}]'.format(errcode))
---
>   check_err = lambda e,errcode: str(e).startswith('[iRods__Error__Code:{}]'.format(errcode))

Here's the output with the adjustment:

$ irule -r irods_rule_engine_plugin-python-instance -F call_testRule.r '*dataPath="/tempZone/home/rods/goo"'

Level 0: DEBUG: msiObjStat: rsObjStat failed for /tempZone/home/rods/goo, status = -310000

We'll get that fixed up