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cache.go
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cache.go
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package splitter
import (
"crypto/sha1"
"fmt"
"io"
"path/filepath"
"strconv"
"time"
git "github.com/libgit2/git2go/v34"
bolt "go.etcd.io/bbolt"
)
type cache struct {
key []byte
branch string
db *bolt.DB
data map[string][]byte
}
func newCache(branch string, config *Config) (*cache, error) {
var err error
db := config.DB
if db == nil {
db, err = bolt.Open(filepath.Join(GitDirectory(config.Path), "splitsh.db"), 0644, &bolt.Options{Timeout: 5 * time.Second})
if err != nil {
return nil, err
}
}
c := &cache{
db: db,
branch: branch,
key: key(config),
data: make(map[string][]byte),
}
err = db.Update(func(tx *bolt.Tx) error {
_, err1 := tx.CreateBucketIfNotExists(c.key)
return err1
})
if err != nil {
return nil, fmt.Errorf("Impossible to create bucket: %s", err)
}
return c, nil
}
func (c *cache) close() error {
err := c.db.Update(func(tx *bolt.Tx) error {
for k, v := range c.data {
if err := tx.Bucket(c.key).Put([]byte(k), v); err != nil {
return err
}
}
return nil
})
if err != nil {
return err
}
return c.db.Close()
}
func key(config *Config) []byte {
h := sha1.New()
if config.Commit != "" {
io.WriteString(h, config.Commit)
} else {
// value does not matter, should just be always the same
io.WriteString(h, "oldest")
}
io.WriteString(h, strconv.Itoa(config.Git))
for _, prefix := range config.Prefixes {
io.WriteString(h, prefix.From)
io.WriteString(h, prefix.To)
}
return h.Sum(nil)
}
func (c *cache) setHead(head *git.Oid) {
c.data["head/"+c.branch] = head[0:20]
}
func (c *cache) getHead() *git.Oid {
if head, ok := c.data["head"+c.branch]; ok {
return git.NewOidFromBytes(head)
}
var oid *git.Oid
c.db.View(func(tx *bolt.Tx) error {
result := tx.Bucket(c.key).Get([]byte("head/" + c.branch))
if result != nil {
c.data["head/"+c.branch] = result
oid = git.NewOidFromBytes(result)
}
return nil
})
return oid
}
func (c *cache) get(rev *git.Oid) *git.Oid {
if v, ok := c.data[string(rev[0:20])]; ok {
return git.NewOidFromBytes(v)
}
var oid *git.Oid
c.db.View(func(tx *bolt.Tx) error {
result := tx.Bucket(c.key).Get(rev[0:20])
if result != nil {
c.data[string(rev[0:20])] = result
oid = git.NewOidFromBytes(result)
}
return nil
})
return oid
}
func (c *cache) set(rev, newrev *git.Oid) {
c.data[string(rev[0:20])] = newrev[0:20]
}
func (c *cache) gets(commits []*git.Oid) []*git.Oid {
var oids []*git.Oid
c.db.View(func(tx *bolt.Tx) error {
b := tx.Bucket(c.key)
for _, commit := range commits {
result := c.data[string(commit[0:20])]
if result != nil {
oids = append(oids, git.NewOidFromBytes(result))
} else {
result := b.Get(commit[0:20])
if result != nil {
oids = append(oids, git.NewOidFromBytes(result))
}
}
}
return nil
})
return oids
}
func (c *cache) flush() error {
return c.db.Update(func(tx *bolt.Tx) error {
if tx.Bucket(c.key) != nil {
err := tx.DeleteBucket(c.key)
if err != nil {
return err
}
_, err = tx.CreateBucketIfNotExists(c.key)
if err != nil {
return err
}
}
return nil
})
}