a2cfcdb91a
The LastCommitCache code is a little complex and there is unnecessary duplication between the gogit and nogogit variants. This PR adds the LastCommitCache as a field to the git.Repository and pre-creates it in the ReferencesGit helpers etc. There has been some simplification and unification of the variant code. Signed-off-by: Andrew Thornton <art27@cantab.net>
115 lines
3.2 KiB
Go
115 lines
3.2 KiB
Go
// Copyright 2020 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 git
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import (
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"crypto/sha256"
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"fmt"
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"code.gitea.io/gitea/modules/log"
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"code.gitea.io/gitea/modules/setting"
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)
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// Cache represents a caching interface
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type Cache interface {
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// Put puts value into cache with key and expire time.
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Put(key string, val interface{}, timeout int64) error
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// Get gets cached value by given key.
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Get(key string) interface{}
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}
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func getCacheKey(repoPath, commitID, entryPath string) string {
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hashBytes := sha256.Sum256([]byte(fmt.Sprintf("%s:%s:%s", repoPath, commitID, entryPath)))
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return fmt.Sprintf("last_commit:%x", hashBytes)
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}
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// LastCommitCache represents a cache to store last commit
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type LastCommitCache struct {
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repoPath string
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ttl func() int64
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repo *Repository
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commitCache map[string]*Commit
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cache Cache
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}
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// NewLastCommitCache creates a new last commit cache for repo
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func NewLastCommitCache(count int64, repoPath string, gitRepo *Repository, cache Cache) *LastCommitCache {
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if cache == nil {
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return nil
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}
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if !setting.CacheService.LastCommit.Enabled || count < setting.CacheService.LastCommit.CommitsCount {
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return nil
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}
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return &LastCommitCache{
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repoPath: repoPath,
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repo: gitRepo,
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ttl: setting.LastCommitCacheTTLSeconds,
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cache: cache,
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}
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}
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// Put put the last commit id with commit and entry path
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func (c *LastCommitCache) Put(ref, entryPath, commitID string) error {
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if c == nil || c.cache == nil {
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return nil
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}
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log.Debug("LastCommitCache save: [%s:%s:%s]", ref, entryPath, commitID)
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return c.cache.Put(getCacheKey(c.repoPath, ref, entryPath), commitID, c.ttl())
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}
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// Get gets the last commit information by commit id and entry path
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func (c *LastCommitCache) Get(ref, entryPath string) (*Commit, error) {
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if c == nil || c.cache == nil {
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return nil, nil
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}
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commitID, ok := c.cache.Get(getCacheKey(c.repoPath, ref, entryPath)).(string)
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if !ok || commitID == "" {
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return nil, nil
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}
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log.Debug("LastCommitCache hit level 1: [%s:%s:%s]", ref, entryPath, commitID)
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if c.commitCache != nil {
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if commit, ok := c.commitCache[commitID]; ok {
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log.Debug("LastCommitCache hit level 2: [%s:%s:%s]", ref, entryPath, commitID)
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return commit, nil
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}
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}
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commit, err := c.repo.GetCommit(commitID)
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if err != nil {
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return nil, err
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}
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if c.commitCache == nil {
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c.commitCache = make(map[string]*Commit)
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}
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c.commitCache[commitID] = commit
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return commit, nil
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}
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// GetCommitByPath gets the last commit for the entry in the provided commit
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func (c *LastCommitCache) GetCommitByPath(commitID, entryPath string) (*Commit, error) {
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sha1, err := NewIDFromString(commitID)
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if err != nil {
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return nil, err
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}
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lastCommit, err := c.Get(sha1.String(), entryPath)
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if err != nil || lastCommit != nil {
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return lastCommit, err
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}
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lastCommit, err = c.repo.getCommitByPathWithID(sha1, entryPath)
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if err != nil {
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return nil, err
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}
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if err := c.Put(commitID, entryPath, lastCommit.ID.String()); err != nil {
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log.Error("Unable to cache %s as the last commit for %q in %s %s. Error %v", lastCommit.ID.String(), entryPath, commitID, c.repoPath, err)
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}
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return lastCommit, nil
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}
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