forgejo/modules
Lunny Xiao bd820aa9c5
Add context cache as a request level cache (#22294)
To avoid duplicated load of the same data in an HTTP request, we can set
a context cache to do that. i.e. Some pages may load a user from a
database with the same id in different areas on the same page. But the
code is hidden in two different deep logic. How should we share the
user? As a result of this PR, now if both entry functions accept
`context.Context` as the first parameter and we just need to refactor
`GetUserByID` to reuse the user from the context cache. Then it will not
be loaded twice on an HTTP request.

But of course, sometimes we would like to reload an object from the
database, that's why `RemoveContextData` is also exposed.

The core context cache is here. It defines a new context
```go
type cacheContext struct {
	ctx  context.Context
	data map[any]map[any]any
        lock sync.RWMutex
}

var cacheContextKey = struct{}{}

func WithCacheContext(ctx context.Context) context.Context {
	return context.WithValue(ctx, cacheContextKey, &cacheContext{
		ctx:  ctx,
		data: make(map[any]map[any]any),
	})
}
```

Then you can use the below 4 methods to read/write/del the data within
the same context.

```go
func GetContextData(ctx context.Context, tp, key any) any
func SetContextData(ctx context.Context, tp, key, value any)
func RemoveContextData(ctx context.Context, tp, key any)
func GetWithContextCache[T any](ctx context.Context, cacheGroupKey string, cacheTargetID any, f func() (T, error)) (T, error)
```

Then let's take a look at how `system.GetString` implement it.

```go
func GetSetting(ctx context.Context, key string) (string, error) {
	return cache.GetWithContextCache(ctx, contextCacheKey, key, func() (string, error) {
		return cache.GetString(genSettingCacheKey(key), func() (string, error) {
			res, err := GetSettingNoCache(ctx, key)
			if err != nil {
				return "", err
			}
			return res.SettingValue, nil
		})
	})
}
```

First, it will check if context data include the setting object with the
key. If not, it will query from the global cache which may be memory or
a Redis cache. If not, it will get the object from the database. In the
end, if the object gets from the global cache or database, it will be
set into the context cache.

An object stored in the context cache will only be destroyed after the
context disappeared.
2023-02-15 21:37:34 +08:00
..
actions Fix actions workflow branches match bug (#22724) 2023-02-02 20:40:08 +08:00
activitypub Add Chef package registry (#22554) 2023-02-06 09:49:21 +08:00
analyze Implement FSFE REUSE for golang files (#21840) 2022-11-27 18:20:29 +00:00
auth Add context cache as a request level cache (#22294) 2023-02-15 21:37:34 +08:00
avatar Unify hashing for avatar (#22289) 2023-01-02 22:46:39 +01:00
base Implement FSFE REUSE for golang files (#21840) 2022-11-27 18:20:29 +00:00
cache Add context cache as a request level cache (#22294) 2023-02-15 21:37:34 +08:00
charset Fix isAllowed of escapeStreamer (#22814) 2023-02-09 20:51:36 +08:00
container Implement FSFE REUSE for golang files (#21840) 2022-11-27 18:20:29 +00:00
context Fix improper HTMLURL usages in Go code (#22839) 2023-02-11 14:34:11 +08:00
csv Implement FSFE REUSE for golang files (#21840) 2022-11-27 18:20:29 +00:00
doctor Add cron method to gc LFS MetaObjects (#22385) 2023-01-16 13:50:53 -06:00
emoji Fix unstable emoji sort (#22346) 2023-01-05 13:58:51 +02:00
eventsource Move convert package to services (#22264) 2022-12-29 10:57:15 +08:00
generate Implement FSFE REUSE for golang files (#21840) 2022-11-27 18:20:29 +00:00
git Remember to attach the parent tree when converting TreeEntry() -> Tree() (#22902) 2023-02-14 21:23:04 +00:00
gitgraph Add context cache as a request level cache (#22294) 2023-02-15 21:37:34 +08:00
graceful Implement FSFE REUSE for golang files (#21840) 2022-11-27 18:20:29 +00:00
hcaptcha Consume hcaptcha and pwn deps (#22610) 2023-01-29 09:49:51 -06:00
highlight Implement FSFE REUSE for golang files (#21840) 2022-11-27 18:20:29 +00:00
hostmatcher Implement FSFE REUSE for golang files (#21840) 2022-11-27 18:20:29 +00:00
html Implement FSFE REUSE for golang files (#21840) 2022-11-27 18:20:29 +00:00
httpcache Add some comments for recent code (#22725) 2023-02-02 11:39:38 -06:00
httplib Implement FSFE REUSE for golang files (#21840) 2022-11-27 18:20:29 +00:00
indexer Make issue and code search support camel case (#22829) 2023-02-12 18:09:03 +08:00
issue/template Allow issue templates to not render title (#22589) 2023-01-26 22:45:49 -06:00
json Update gitea-vet to check FSFE REUSE (#22004) 2022-12-02 22:14:57 +08:00
lfs escape filename when assemble URL (#22850) 2023-02-12 09:31:14 +08:00
log Improve trace logging for pulls and processes (#22633) 2023-02-03 18:11:48 -05:00
markup Move IsReadmeFile* from modules/markup/ to modules/util (#22877) 2023-02-13 15:01:09 -05:00
mcaptcha Implement FSFE REUSE for golang files (#21840) 2022-11-27 18:20:29 +00:00
metrics include build info in Prometheus metrics (#22819) 2023-02-08 19:54:01 +02:00
migration Fix restore repo bug, clarify the problem of ForeignIndex (#22776) 2023-02-07 09:18:52 +08:00
mirror Implement FSFE REUSE for golang files (#21840) 2022-11-27 18:20:29 +00:00
nosql Implement FSFE REUSE for golang files (#21840) 2022-11-27 18:20:29 +00:00
notification Implement actions (#21937) 2023-01-31 09:45:19 +08:00
options Implement FSFE REUSE for golang files (#21840) 2022-11-27 18:20:29 +00:00
packages Use import of OCI structs (#22765) 2023-02-06 10:07:09 +00:00
paginator Update gitea-vet to check FSFE REUSE (#22004) 2022-12-02 22:14:57 +08:00
password Consume hcaptcha and pwn deps (#22610) 2023-01-29 09:49:51 -06:00
pprof Implement FSFE REUSE for golang files (#21840) 2022-11-27 18:20:29 +00:00
private Implement actions (#21937) 2023-01-31 09:45:19 +08:00
process Improve trace logging for pulls and processes (#22633) 2023-02-03 18:11:48 -05:00
proxy Use proxy for pull mirror (#22771) 2023-02-11 08:39:50 +08:00
proxyprotocol Implement FSFE REUSE for golang files (#21840) 2022-11-27 18:20:29 +00:00
public Implement FSFE REUSE for golang files (#21840) 2022-11-27 18:20:29 +00:00
queue Correctly handle select on multiple channels in Queues (#22146) 2022-12-30 02:06:47 +02:00
recaptcha Implement FSFE REUSE for golang files (#21840) 2022-11-27 18:20:29 +00:00
references Use correct captured group range when parsing cross-reference (#22672) 2023-01-31 10:08:05 +01:00
regexplru Implement FSFE REUSE for golang files (#21840) 2022-11-27 18:20:29 +00:00
repository Add context cache as a request level cache (#22294) 2023-02-15 21:37:34 +08:00
secret Implement FSFE REUSE for golang files (#21840) 2022-11-27 18:20:29 +00:00
session Update gitea-vet to check FSFE REUSE (#22004) 2022-12-02 22:14:57 +08:00
setting Add Chef package registry (#22554) 2023-02-06 09:49:21 +08:00
sitemap Fix sitemap (#22272) 2022-12-30 23:31:00 +08:00
ssh Implement FSFE REUSE for golang files (#21840) 2022-11-27 18:20:29 +00:00
storage Implement actions (#21937) 2023-01-31 09:45:19 +08:00
structs Pull Requests: setting to allow edits by maintainers by default, tweak UI (#22862) 2023-02-13 14:09:52 +08:00
svg Implement FSFE REUSE for golang files (#21840) 2022-11-27 18:20:29 +00:00
sync Implement FSFE REUSE for golang files (#21840) 2022-11-27 18:20:29 +00:00
system Implement FSFE REUSE for golang files (#21840) 2022-11-27 18:20:29 +00:00
templates Add context cache as a request level cache (#22294) 2023-02-15 21:37:34 +08:00
test refactor some functions to support ctx as first parameter (#21878) 2022-12-03 10:48:26 +08:00
timeutil Check for zero time instant in TimeStamp.IsZero() (#22171) 2022-12-20 10:04:55 +08:00
translation Implement FSFE REUSE for golang files (#21840) 2022-11-27 18:20:29 +00:00
turnstile Add new captcha: cloudflare turnstile (#22369) 2023-02-05 15:29:03 +08:00
typesniffer Implement FSFE REUSE for golang files (#21840) 2022-11-27 18:20:29 +00:00
updatechecker Implement FSFE REUSE for golang files (#21840) 2022-11-27 18:20:29 +00:00
upload Implement FSFE REUSE for golang files (#21840) 2022-11-27 18:20:29 +00:00
uri Implement FSFE REUSE for golang files (#21840) 2022-11-27 18:20:29 +00:00
user Implement FSFE REUSE for golang files (#21840) 2022-11-27 18:20:29 +00:00
util Move IsReadmeFile* from modules/markup/ to modules/util (#22877) 2023-02-13 15:01:09 -05:00
validation Map OIDC groups to Orgs/Teams (#21441) 2023-02-08 14:44:42 +08:00
watcher Implement FSFE REUSE for golang files (#21840) 2022-11-27 18:20:29 +00:00
web Map OIDC groups to Orgs/Teams (#21441) 2023-02-08 14:44:42 +08:00
webhook Restructure webhook module (#22256) 2023-01-01 23:23:15 +08:00