Refactor openstack interface

[yhaliaw]

Applicable spec:

Overview

Rationale

Juju Events Changes

Module Changes

Library Changes

Checklist

• The charm style guide was applied
• The contributing guide was applied
• The changes are compliant with ISD054 - Managing Charm Complexity
• The documentation is generated using src-docs
• The documentation for charmhub is updated.
• The PR is tagged with appropriate label (urgent, trivial, complex)

[github-actions]

Lint checks failed for a2aa917

```

/home/runner/work/github-runner-operator/github-runner-operator/src/openstack_cloud/openstack_cloud.py:1 at module level:
D100: Missing docstring in public module
/home/runner/work/github-runner-operator/github-runner-operator/src/openstack_cloud/openstack_cloud.py:44 in public class OpenstackInstance:
D101: Missing docstring in public class
/home/runner/work/github-runner-operator/github-runner-operator/src/openstack_cloud/openstack_cloud.py:49 in public method __init__:
D107: Missing docstring in init
/home/runner/work/github-runner-operator/github-runner-operator/src/openstack_cloud/openstack_cloud.py:93 in public class OpenstackCloud:
D101: Missing docstring in public class
/home/runner/work/github-runner-operator/github-runner-operator/src/openstack_cloud/openstack_cloud.py:108 in public method launch_instance:
D102: Missing docstring in public method
/home/runner/work/github-runner-operator/github-runner-operator/src/openstack_cloud/openstack_cloud.py:149 in public method delete_instance:
D102: Missing docstring in public method
/home/runner/work/github-runner-operator/github-runner-operator/src/openstack_cloud/openstack_cloud.py:160 in public method get_ssh_connection:
D102: Missing docstring in public method
/home/runner/work/github-runner-operator/github-runner-operator/src/openstack_cloud/openstack_cloud.py:197 in public method get_instances:
D102: Missing docstring in public method
/home/runner/work/github-runner-operator/github-runner-operator/src/openstack_cloud/openstack_cloud.py:275 in public method get_instance_name:
D102: Missing docstring in public method

[github-actions]

Test coverage for a2aa917

Name                                       Stmts   Miss Branch BrPart  Cover   Missing
--------------------------------------------------------------------------------------
src/charm.py                                 566    139    145     26    72%   227-229, 291-310, 328-330, 331->335, 361-365, 438, 445-447, 474-479, 496-501, 522, 534-540, 554-555, 568, 573, 603-604, 606->615, 610->615, 620-626, 660, 664-669, 720-725, 734->737, 760-777, 781-782, 810-837, 850-853, 874-884, 898-900, 947-948, 950-951, 953-954, 1033->1035, 1100-1101, 1139-1141, 1149-1155, 1219-1244, 1253
src/charm_state.py                           458     17    108      5    95%   334-346, 528-532, 654-655, 710-711, 1146->1149, 1153-1154, 1201
src/errors.py                                 41      0      0      0   100%
src/event_timer.py                            54      7      2      1    86%   105-106, 131, 148-149, 165-166
src/firewall.py                               51     18     20      0    61%   42-43, 66-69, 111-185
src/github_client.py                          96     16     40      5    79%   65-72, 119->exit, 124-125, 195, 218, 231-238, 260->300, 294
src/github_type.py                            50      0      0      0   100%
src/logrotate.py                              43      0      2      0   100%
src/lxd_type.py                               35      0      2      0   100%
src/metrics/__init__.py                        0      0      0      0   100%
src/metrics/events.py                         55      2      8      1    95%   56->59, 166-167
src/metrics/github.py                         16      0      0      0   100%
src/metrics/runner.py                        144     10     32      3    91%   160, 186-199, 235, 272, 454-455
src/metrics/runner_logs.py                    24      5      4      1    79%   30-33, 47->46, 51-52
src/metrics/storage.py                        70      8     12      0    90%   89-90, 117-118, 182-183, 189-190
src/metrics/type.py                            5      0      0      0   100%
src/openstack_cloud/__init__.py               26      0      2      0   100%
src/openstack_cloud/openstack_cloud.py       199    199     72      0     0%   4-433
src/openstack_cloud/openstack_manager.py     540    118    162     21    77%   96, 229, 283, 285, 287, 404-407, 453, 456, 497-498, 664-691, 831-832, 854->exit, 864, 891-892, 895-896, 939, 948-949, 979, 984-991, 1004-1010, 1014-1016, 1032-1038, 1057-1058, 1060-1071, 1078-1082, 1086-1089, 1112-1113, 1118-1124, 1142, 1157-1182, 1207-1221, 1237-1244, 1278, 1392-1397, 1418-1420, 1448-1453, 1475-1476, 1484-1494
src/reactive/__init__.py                       0      0      0      0   100%
src/reactive/consumer.py                      40      2      6      0    96%   98-101
src/reactive/runner_manager.py                53      0     14      1    99%   102->exit
src/runner_manager_type.py                    51      0      8      0   100%
src/runner_type.py                            37      0     10      0   100%
src/shared_fs.py                              93     17     10      1    83%   51-52, 119-120, 145-146, 154-155, 161-162, 180, 183-184, 196-197, 240-241
src/utilities.py                              68      7     20      7    82%   86->88, 90->96, 103, 133, 147, 186-189, 244
--------------------------------------------------------------------------------------
TOTAL                                       2815    565    679     72    77%
Coverage failure: total of 77 is less than fail-under=83

Static code analysis report

Run started:2024-08-01 01:51:10.037796

Test results:
  No issues identified.

Code scanned:
  Total lines of code: 7992
  Total lines skipped (#nosec): 4
  Total potential issues skipped due to specifically being disabled (e.g., #nosec BXXX): 7

Run metrics:
  Total issues (by severity):
  	Undefined: 0
  	Low: 0
  	Medium: 0
  	High: 0
  Total issues (by confidence):
  	Undefined: 0
  	Low: 0
  	Medium: 0
  	High: 0
Files skipped (0):

[cbartz]

@yhaliaw can this PR be closed?