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2f725cbc9e
The current default memory cache implementation is unbounded in size and number of objects cached. This is hardly ideal. This PR proposes creating a TwoQueue LRU cache as the underlying cache for Gitea. The cache is limited by the number of objects stored in the cache (rather than size) for simplicity. The default number of objects is 50000 - which is perhaps too small as most of our objects cached are going to be much less than 1kB. It may be worth considering using a different LRU implementation that actively limits sizes or avoids GC - however, this is just a beginning implementation. Signed-off-by: Andrew Thornton <art27@cantab.net>
111 lines
2.8 KiB
Go
111 lines
2.8 KiB
Go
// Copyright 2019 The Gitea Authors. All rights reserved.
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// Use of this source code is governed by a MIT-style
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// license that can be found in the LICENSE file.
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package setting
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import (
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"strings"
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"time"
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"code.gitea.io/gitea/modules/log"
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)
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// Cache represents cache settings
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type Cache struct {
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Enabled bool
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Adapter string
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Interval int
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Conn string
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TTL time.Duration `ini:"ITEM_TTL"`
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}
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var (
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// CacheService the global cache
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CacheService = struct {
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Cache `ini:"cache"`
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LastCommit struct {
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Enabled bool
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TTL time.Duration `ini:"ITEM_TTL"`
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CommitsCount int64
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} `ini:"cache.last_commit"`
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}{
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Cache: Cache{
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Enabled: true,
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Adapter: "memory",
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Interval: 60,
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TTL: 16 * time.Hour,
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},
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LastCommit: struct {
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Enabled bool
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TTL time.Duration `ini:"ITEM_TTL"`
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CommitsCount int64
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}{
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Enabled: true,
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TTL: 8760 * time.Hour,
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CommitsCount: 1000,
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},
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}
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)
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// MemcacheMaxTTL represents the maximum memcache TTL
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const MemcacheMaxTTL = 30 * 24 * time.Hour
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func newCacheService() {
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sec := Cfg.Section("cache")
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if err := sec.MapTo(&CacheService); err != nil {
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log.Fatal("Failed to map Cache settings: %v", err)
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}
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CacheService.Adapter = sec.Key("ADAPTER").In("memory", []string{"memory", "redis", "memcache", "twoqueue"})
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switch CacheService.Adapter {
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case "memory":
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case "redis", "memcache":
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CacheService.Conn = strings.Trim(sec.Key("HOST").String(), "\" ")
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case "twoqueue":
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CacheService.Conn = strings.TrimSpace(sec.Key("HOST").String())
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if CacheService.Conn == "" {
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CacheService.Conn = "50000"
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}
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case "": // disable cache
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CacheService.Enabled = false
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default:
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log.Fatal("Unknown cache adapter: %s", CacheService.Adapter)
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}
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if CacheService.Enabled {
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log.Info("Cache Service Enabled")
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} else {
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log.Warn("Cache Service Disabled so that captcha disabled too")
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// captcha depends on cache service
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Service.EnableCaptcha = false
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}
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sec = Cfg.Section("cache.last_commit")
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if !CacheService.Enabled {
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CacheService.LastCommit.Enabled = false
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}
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CacheService.LastCommit.CommitsCount = sec.Key("COMMITS_COUNT").MustInt64(1000)
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if CacheService.LastCommit.Enabled {
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log.Info("Last Commit Cache Service Enabled")
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}
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}
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// TTLSeconds returns the TTLSeconds or unix timestamp for memcache
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func (c Cache) TTLSeconds() int64 {
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if c.Adapter == "memcache" && c.TTL > MemcacheMaxTTL {
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return time.Now().Add(c.TTL).Unix()
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}
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return int64(c.TTL.Seconds())
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}
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// LastCommitCacheTTLSeconds returns the TTLSeconds or unix timestamp for memcache
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func LastCommitCacheTTLSeconds() int64 {
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if CacheService.Adapter == "memcache" && CacheService.LastCommit.TTL > MemcacheMaxTTL {
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return time.Now().Add(CacheService.LastCommit.TTL).Unix()
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}
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return int64(CacheService.LastCommit.TTL.Seconds())
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}
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