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wxiaoguang 6f9c278559
Rewrite queue (#24505)
# ⚠️ Breaking

Many deprecated queue config options are removed (actually, they should
have been removed in 1.18/1.19).

If you see the fatal message when starting Gitea: "Please update your
app.ini to remove deprecated config options", please follow the error
messages to remove these options from your app.ini.

Example:

```
2023/05/06 19:39:22 [E] Removed queue option: `[indexer].ISSUE_INDEXER_QUEUE_TYPE`. Use new options in `[queue.issue_indexer]`
2023/05/06 19:39:22 [E] Removed queue option: `[indexer].UPDATE_BUFFER_LEN`. Use new options in `[queue.issue_indexer]`
2023/05/06 19:39:22 [F] Please update your app.ini to remove deprecated config options
```

Many options in `[queue]` are are dropped, including:
`WRAP_IF_NECESSARY`, `MAX_ATTEMPTS`, `TIMEOUT`, `WORKERS`,
`BLOCK_TIMEOUT`, `BOOST_TIMEOUT`, `BOOST_WORKERS`, they can be removed
from app.ini.

# The problem

The old queue package has some legacy problems:

* complexity: I doubt few people could tell how it works.
* maintainability: Too many channels and mutex/cond are mixed together,
too many different structs/interfaces depends each other.
* stability: due to the complexity & maintainability, sometimes there
are strange bugs and difficult to debug, and some code doesn't have test
(indeed some code is difficult to test because a lot of things are mixed
together).
* general applicability: although it is called "queue", its behavior is
not a well-known queue.
* scalability: it doesn't seem easy to make it work with a cluster
without breaking its behaviors.

It came from some very old code to "avoid breaking", however, its
technical debt is too heavy now. It's a good time to introduce a better
"queue" package.

# The new queue package

It keeps using old config and concept as much as possible.

* It only contains two major kinds of concepts:
    * The "base queue": channel, levelqueue, redis
* They have the same abstraction, the same interface, and they are
tested by the same testing code.
* The "WokerPoolQueue", it uses the "base queue" to provide "worker
pool" function, calls the "handler" to process the data in the base
queue.
* The new code doesn't do "PushBack"
* Think about a queue with many workers, the "PushBack" can't guarantee
the order for re-queued unhandled items, so in new code it just does
"normal push"
* The new code doesn't do "pause/resume"
* The "pause/resume" was designed to handle some handler's failure: eg:
document indexer (elasticsearch) is down
* If a queue is paused for long time, either the producers blocks or the
new items are dropped.
* The new code doesn't do such "pause/resume" trick, it's not a common
queue's behavior and it doesn't help much.
* If there are unhandled items, the "push" function just blocks for a
few seconds and then re-queue them and retry.
* The new code doesn't do "worker booster"
* Gitea's queue's handlers are light functions, the cost is only the
go-routine, so it doesn't make sense to "boost" them.
* The new code only use "max worker number" to limit the concurrent
workers.
* The new "Push" never blocks forever
* Instead of creating more and more blocking goroutines, return an error
is more friendly to the server and to the end user.

There are more details in code comments: eg: the "Flush" problem, the
strange "code.index" hanging problem, the "immediate" queue problem.

Almost ready for review.

TODO:

* [x] add some necessary comments during review
* [x] add some more tests if necessary
* [x] update documents and config options
* [x] test max worker / active worker
* [x] re-run the CI tasks to see whether any test is flaky
* [x] improve the `handleOldLengthConfiguration` to provide more
friendly messages
* [x] fine tune default config values (eg: length?)

## Code coverage:

![image](https://user-images.githubusercontent.com/2114189/236620635-55576955-f95d-4810-b12f-879026a3afdf.png)
2023-05-08 19:49:59 +08:00
..
check.go Rewrite queue (#24505) 2023-05-08 19:49:59 +08:00
check_test.go Rewrite queue (#24505) 2023-05-08 19:49:59 +08:00
comment.go Make more functions use ctx instead of db.DefaultContext (#24068) 2023-04-14 14:18:28 -04:00
commit_status.go Supports wildcard protected branch (#20825) 2023-01-16 16:00:22 +08:00
edits.go Implement FSFE REUSE for golang files (#21840) 2022-11-27 18:20:29 +00:00
lfs.go Refactor and tidy-up the merge/update branch code (#22568) 2023-03-07 15:07:35 -05:00
main_test.go Implement FSFE REUSE for golang files (#21840) 2022-11-27 18:20:29 +00:00
merge.go Refactor merge/update git command calls (#23366) 2023-03-09 09:48:52 -06:00
merge_merge.go Refactor and tidy-up the merge/update branch code (#22568) 2023-03-07 15:07:35 -05:00
merge_prepare.go Refactor merge/update git command calls (#23366) 2023-03-09 09:48:52 -06:00
merge_rebase.go Refactor and tidy-up the merge/update branch code (#22568) 2023-03-07 15:07:35 -05:00
merge_squash.go Improve squash merge commit author and co-author with private emails (#22977) 2023-03-09 22:17:04 -05:00
merge_test.go Support template for merge message description (#22248) 2022-12-29 14:40:20 +02:00
patch.go Refactor and tidy-up the merge/update branch code (#22568) 2023-03-07 15:07:35 -05:00
patch_unmerged.go Implement FSFE REUSE for golang files (#21840) 2022-11-27 18:20:29 +00:00
pull.go Refresh the refernce of the closed PR when reopening (#24231) 2023-05-08 14:39:32 +08:00
pull_test.go Support template for merge message description (#22248) 2022-12-29 14:40:20 +02:00
review.go Make more functions use ctx instead of db.DefaultContext (#24068) 2023-04-14 14:18:28 -04:00
temp_repo.go Refactor and tidy-up the merge/update branch code (#22568) 2023-03-07 15:07:35 -05:00
update.go Refactor and tidy-up the merge/update branch code (#22568) 2023-03-07 15:07:35 -05:00
update_rebase.go Refactor and tidy-up the merge/update branch code (#22568) 2023-03-07 15:07:35 -05:00