 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:
 1 year ago 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:
 1 year ago |
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- APP_NAME = Gitea: Git with a cup of tea
- RUN_MODE = prod
-
- [database]
- DB_TYPE = mysql
- HOST = {{TEST_MYSQL_HOST}}
- NAME = {{TEST_MYSQL_DBNAME}}
- USER = {{TEST_MYSQL_USERNAME}}
- PASSWD = {{TEST_MYSQL_PASSWORD}}
- SSL_MODE = disable
-
- [indexer]
- REPO_INDEXER_ENABLED = true
- REPO_INDEXER_PATH = tests/{{TEST_TYPE}}/gitea-{{TEST_TYPE}}-mysql/indexers/repos.bleve
- ISSUE_INDEXER_TYPE = elasticsearch
- ISSUE_INDEXER_CONN_STR = http://elastic:changeme@elasticsearch:9200
-
- [queue.issue_indexer]
- TYPE = level
- DATADIR = tests/{{TEST_TYPE}}/gitea-{{TEST_TYPE}}-mysql/indexers/issues.queue
-
- [queue]
- TYPE = immediate
-
- [queue.code_indexer]
- TYPE = immediate
-
- [queue.push_update]
- TYPE = immediate
-
- [repository]
- ROOT = {{REPO_TEST_DIR}}tests/{{TEST_TYPE}}/gitea-{{TEST_TYPE}}-mysql/gitea-repositories
-
- [repository.local]
- LOCAL_COPY_PATH = tests/{{TEST_TYPE}}/gitea-{{TEST_TYPE}}-mysql/tmp/local-repo
-
- [repository.upload]
- TEMP_PATH = tests/{{TEST_TYPE}}/gitea-{{TEST_TYPE}}-mysql/tmp/uploads
-
- [repository.signing]
- SIGNING_KEY = none
-
- [server]
- SSH_DOMAIN = localhost
- HTTP_PORT = 3001
- ROOT_URL = http://localhost:3001/
- DISABLE_SSH = false
- SSH_LISTEN_HOST = localhost
- SSH_PORT = 2201
- APP_DATA_PATH = tests/{{TEST_TYPE}}/gitea-{{TEST_TYPE}}-mysql/data
- BUILTIN_SSH_SERVER_USER = git
- START_SSH_SERVER = true
- OFFLINE_MODE = false
-
- LFS_START_SERVER = true
- LFS_JWT_SECRET = Tv_MjmZuHqpIY6GFl12ebgkRAMt4RlWt0v4EHKSXO0w
- SSH_TRUSTED_USER_CA_KEYS = ssh-rsa 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
-
- [mailer]
- ENABLED = true
- PROTOCOL = dummy
- FROM = mysql-{{TEST_TYPE}}-test@gitea.io
-
- [service]
- REGISTER_EMAIL_CONFIRM = false
- REGISTER_MANUAL_CONFIRM = false
- DISABLE_REGISTRATION = false
- ENABLE_CAPTCHA = false
- REQUIRE_SIGNIN_VIEW = false
- DEFAULT_KEEP_EMAIL_PRIVATE = false
- DEFAULT_ALLOW_CREATE_ORGANIZATION = true
- NO_REPLY_ADDRESS = noreply.example.org
- ENABLE_NOTIFY_MAIL = true
-
- [picture]
- DISABLE_GRAVATAR = false
- ENABLE_FEDERATED_AVATAR = false
-
- [session]
- PROVIDER = file
- PROVIDER_CONFIG = tests/{{TEST_TYPE}}/gitea-{{TEST_TYPE}}-mysql/data/sessions
-
- [log]
- MODE = {{TEST_LOGGER}}
- ROOT_PATH = {{REPO_TEST_DIR}}mysql-log
- ENABLE_SSH_LOG = true
- logger.xorm.MODE = file
-
- [log.test]
- LEVEL = Info
- COLORIZE = true
-
- [log.file]
- LEVEL = Debug
-
- [security]
- DISABLE_GIT_HOOKS = false
- INSTALL_LOCK = true
- SECRET_KEY = 9pCviYTWSb
- INTERNAL_TOKEN = eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJuYmYiOjE0OTU1NTE2MTh9.hhSVGOANkaKk3vfCd2jDOIww4pUk0xtg9JRde5UogyQ
-
- [lfs]
- PATH = tests/{{TEST_TYPE}}/gitea-{{TEST_TYPE}}-mysql/data/lfs
-
- [packages]
- ENABLED = true
-
- [email.incoming]
- ; temporarily disabled because the incoming mail tests are flaky due to the IMAP server (during integration tests) couldn't be not ready in time sometimes.
- ENABLED = false
- HOST = smtpimap
- PORT = 993
- USERNAME = debug@localdomain.test
- PASSWORD = debug
- USE_TLS = true
- SKIP_TLS_VERIFY = true
- REPLY_TO_ADDRESS = incoming+%{token}@localhost
-
- [actions]
- ENABLED = true
|
