Logical Replication

[Zvirovyi]

This is an implementation of the Logical Replication specification (WIP): https://docs.google.com/document/d/1f84Z4cZwUD4q4bJsXTTC_PUaZr7pPB0Q6HnQ9cgCX_o/edit?usp=sharing.

Basic testing

1. deploy postgresql and postgresql2
2. juju integrate postgresql:logical-replication-offer postgresql2:logical-replication
3. create testing table with data in the postgresql: create table asd (message text); insert into asd values ('hello');
4. create the same table on the postgresql2 side
5. juju run postgresql/leader add-publication name=asd database=postgres tables=public.asd
6. juju run postgresql2/leader subscribe name=asd
7. check the table on postgresql2 side: select * from asd;
8. add another data to the testing table and observe it was pushed to the postgresql2 subscriber

Key notes

• will fix tests after initial PR & specification review;
• there is the same K8s PR;
• postgesql-k8s lib synced with K8s revision.

[codecov]

Codecov Report

Attention: Patch coverage is 19.28375% with 293 lines in your changes missing coverage. Please review.

Project coverage is 67.99%. Comparing base (7686dd0) to head (62087a3).
Report is 4 commits behind head on main.

Files with missing lines	Patch %	Lines
src/relations/logical_replication.py	17.50%	276 Missing and 2 partials ⚠️
src/backups.py	33.33%	8 Missing and 2 partials ⚠️
src/cluster.py	16.66%	5 Missing ⚠️

❌ Your patch check has failed because the patch coverage (19.28%) is below the target coverage (33.00%). You can increase the patch coverage or adjust the target coverage.
❌ Your project check has failed because the head coverage (67.99%) is below the target coverage (70.00%). You can increase the head coverage or adjust the target coverage.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #795      +/-   ##
==========================================
- Coverage   72.08%   67.99%   -4.10%     
==========================================
  Files          15       16       +1     
  Lines        3865     4255     +390     
  Branches      584      668      +84     
==========================================
+ Hits         2786     2893     +107     
- Misses        898     1174     +276     
- Partials      181      188       +7     

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[marceloneppel]

The code looks great! I'll only do some more testing tomorrow.

[marceloneppel]

LGTM! Great work!