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aaf35ee49c
Backport #27000 by @wxiaoguang This PR reduces the complexity of the system setting system. It only needs one line to introduce a new option, and the option can be used anywhere out-of-box. It is still high-performant (and more performant) because the config values are cached in the config system.  Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>
82 lines
1.7 KiB
Go
82 lines
1.7 KiB
Go
// Copyright 2023 The Gitea Authors. All rights reserved.
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// SPDX-License-Identifier: MIT
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package config
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import (
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"context"
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"strconv"
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"sync"
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)
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type CfgSecKey struct {
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Sec, Key string
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}
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type Value[T any] struct {
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mu sync.RWMutex
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cfgSecKey CfgSecKey
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dynKey string
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def, value T
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revision int
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}
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func (value *Value[T]) parse(s string) (v T) {
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switch any(v).(type) {
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case bool:
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b, _ := strconv.ParseBool(s)
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return any(b).(T)
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default:
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panic("unsupported config type, please complete the code")
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}
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}
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func (value *Value[T]) Value(ctx context.Context) (v T) {
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dg := GetDynGetter()
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if dg == nil {
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// this is an edge case: the database is not initialized but the system setting is going to be used
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// it should panic to avoid inconsistent config values (from config / system setting) and fix the code
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panic("no config dyn value getter")
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}
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rev := dg.GetRevision(ctx)
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// if the revision in database doesn't change, use the last value
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value.mu.RLock()
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if rev == value.revision {
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v = value.value
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value.mu.RUnlock()
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return v
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}
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value.mu.RUnlock()
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// try to parse the config and cache it
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var valStr *string
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if dynVal, has := dg.GetValue(ctx, value.dynKey); has {
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valStr = &dynVal
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} else if cfgVal, has := GetCfgSecKeyGetter().GetValue(value.cfgSecKey.Sec, value.cfgSecKey.Key); has {
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valStr = &cfgVal
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}
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if valStr == nil {
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v = value.def
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} else {
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v = value.parse(*valStr)
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}
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value.mu.Lock()
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value.value = v
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value.revision = rev
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value.mu.Unlock()
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return v
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}
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func (value *Value[T]) DynKey() string {
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return value.dynKey
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}
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func Bool(def bool, cfgSecKey CfgSecKey, dynKey string) *Value[bool] {
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return &Value[bool]{def: def, cfgSecKey: cfgSecKey, dynKey: dynKey}
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}
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