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shared_browser_cache.go
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/
shared_browser_cache.go
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// Copyright 2018 Keybase Inc. All rights reserved.
// Use of this source code is governed by a BSD
// license that can be found in the LICENSE file.
package libgit
import (
"os"
lru "github.com/hashicorp/golang-lru"
"gopkg.in/src-d/go-git.v4/plumbing"
)
type browserCacheEntryType int
const (
_ browserCacheEntryType = iota
fileInfoBrowserCacheEntry
childrenPathsBrowserCacheEntry
)
type sharedInBrowserCache interface {
setFileInfo(
commitHash plumbing.Hash, entryPathRelativeToRepoRoot string,
fi os.FileInfo)
setChildrenPaths(
commitHash plumbing.Hash, entryPathRelativeToRepoRoot string,
childrenPathsRelativeToRepoRoot []string)
getFileInfo(
commitHash plumbing.Hash, entryPathRelativeToRepoRoot string) (
fi os.FileInfo, ok bool)
getChildrenFileInfos(
commitHash plumbing.Hash, entryPathRelativeToRepoRoot string) (
fis []os.FileInfo, ok bool)
}
type noopSharedInBrowserCache struct{}
func (noopSharedInBrowserCache) setFileInfo(
plumbing.Hash, string, os.FileInfo) {
}
func (noopSharedInBrowserCache) setChildrenPaths(
plumbing.Hash, string, []string) {
}
func (noopSharedInBrowserCache) getFileInfo(
plumbing.Hash, string) (os.FileInfo, bool) {
return nil, false
}
func (noopSharedInBrowserCache) getChildrenFileInfos(
plumbing.Hash, string) ([]os.FileInfo, bool) {
return nil, false
}
type gitBrowserCacheKey struct {
commitHash plumbing.Hash
relativePath string // relative path
entryType browserCacheEntryType
}
type lruSharedInBrowserCache struct {
cache *lru.Cache
}
const lruSharedInBrowserCacheSize = 1 << 16 // ~ 64 thousand entries
func newLRUSharedInBrowserCache() (lruSharedInBrowserCache, error) {
cache, err := lru.New(lruSharedInBrowserCacheSize)
if err != nil {
return lruSharedInBrowserCache{}, err
}
return lruSharedInBrowserCache{cache: cache}, nil
}
func (c lruSharedInBrowserCache) setFileInfo(
commitHash plumbing.Hash, entryPathRelativeToRepoRoot string,
fi os.FileInfo) {
c.cache.Add(
gitBrowserCacheKey{
commitHash: commitHash,
relativePath: entryPathRelativeToRepoRoot,
entryType: fileInfoBrowserCacheEntry,
},
fi,
)
}
func (c lruSharedInBrowserCache) setChildrenPaths(
commitHash plumbing.Hash, entryPathRelativeToRepoRoot string,
childrenPathsRelativeToRepoRoot []string) {
c.cache.Add(
gitBrowserCacheKey{
commitHash: commitHash,
relativePath: entryPathRelativeToRepoRoot,
entryType: childrenPathsBrowserCacheEntry,
},
childrenPathsRelativeToRepoRoot,
)
}
func (c lruSharedInBrowserCache) getFileInfo(
commitHash plumbing.Hash, entryPathRelativeToRepoRoot string) (
fi os.FileInfo, ok bool) {
entry, ok := c.cache.Get(
gitBrowserCacheKey{
commitHash: commitHash,
relativePath: entryPathRelativeToRepoRoot,
entryType: fileInfoBrowserCacheEntry,
},
)
if !ok {
return nil, false
}
if fi, ok = entry.(os.FileInfo); !ok {
panic("rogue entry in lruSharedInBrowserCache")
}
return fi, true
}
func (c lruSharedInBrowserCache) getChildrenFileInfos(
commitHash plumbing.Hash, entryPathRelativeToRepoRoot string) (
fis []os.FileInfo, ok bool) {
entry, ok := c.cache.Get(
gitBrowserCacheKey{
commitHash: commitHash,
relativePath: entryPathRelativeToRepoRoot,
entryType: childrenPathsBrowserCacheEntry,
},
)
if !ok {
return nil, false
}
var paths []string
if paths, ok = entry.([]string); !ok {
panic("rogue entry in lruSharedInBrowserCache")
}
for _, p := range paths {
fi, ok := c.getFileInfo(commitHash, p)
if !ok {
return nil, false
}
fis = append(fis, fi)
}
return fis, true
}