mirror of
https://github.com/splitsh/lite.git
synced 2024-06-29 10:40:57 +02:00
153 lines
2.8 KiB
Go
153 lines
2.8 KiB
Go
package splitter
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import (
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"crypto/sha1"
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"fmt"
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"io"
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"path/filepath"
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"strconv"
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"time"
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git "github.com/libgit2/git2go/v34"
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bolt "go.etcd.io/bbolt"
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)
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type cache struct {
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key []byte
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branch string
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db *bolt.DB
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}
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func newCache(branch string, config *Config) (*cache, error) {
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var err error
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db := config.DB
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if db == nil {
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db, err = bolt.Open(filepath.Join(GitDirectory(config.Path), "splitsh.db"), 0644, &bolt.Options{Timeout: 5 * time.Second})
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if err != nil {
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return nil, err
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}
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}
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c := &cache{
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db: db,
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branch: branch,
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key: key(config),
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}
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err = db.Update(func(tx *bolt.Tx) error {
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_, err1 := tx.CreateBucketIfNotExists(c.key)
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return err1
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})
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if err != nil {
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return nil, fmt.Errorf("Impossible to create bucket: %s", err)
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}
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return c, nil
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}
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func (c *cache) close() error {
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return c.db.Close()
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}
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func key(config *Config) []byte {
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h := sha1.New()
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if config.Commit != "" {
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io.WriteString(h, config.Commit)
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} else {
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// value does not matter, should just be always the same
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io.WriteString(h, "oldest")
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}
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io.WriteString(h, strconv.Itoa(config.Git))
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for _, prefix := range config.Prefixes {
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io.WriteString(h, prefix.From)
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io.WriteString(h, prefix.To)
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}
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return h.Sum(nil)
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}
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func (c *cache) setHead(head *git.Oid) error {
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return c.db.Update(func(tx *bolt.Tx) error {
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return tx.Bucket(c.key).Put([]byte("head/"+c.branch), head[0:20])
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})
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}
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func (c *cache) getHead() *git.Oid {
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var oid *git.Oid
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c.db.View(func(tx *bolt.Tx) error {
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result := tx.Bucket(c.key).Get([]byte("head/" + c.branch))
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if result != nil {
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oid = git.NewOidFromBytes(result)
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}
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return nil
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})
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return oid
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}
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func (c *cache) get(rev *git.Oid) *git.Oid {
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var oid *git.Oid
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c.db.View(func(tx *bolt.Tx) error {
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result := tx.Bucket(c.key).Get(rev[0:20])
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if result != nil {
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oid = git.NewOidFromBytes(result)
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}
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return nil
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})
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return oid
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}
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func (c *cache) set(rev, newrev *git.Oid, created bool) error {
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return c.db.Update(func(tx *bolt.Tx) error {
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err := tx.Bucket(c.key).Put(rev[0:20], newrev[0:20])
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if err != nil {
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return err
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}
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postfix := "/newest"
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if created {
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postfix = "/oldest"
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}
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key := append(newrev[0:20], []byte(postfix)...)
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return tx.Bucket(c.key).Put(key, rev[0:20])
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})
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}
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func (c *cache) gets(commits []*git.Oid) []*git.Oid {
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var oids []*git.Oid
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c.db.View(func(tx *bolt.Tx) error {
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b := tx.Bucket(c.key)
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for _, commit := range commits {
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result := b.Get(commit[0:20])
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if result != nil {
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oids = append(oids, git.NewOidFromBytes(result))
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}
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}
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return nil
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})
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return oids
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}
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func (c *cache) flush() error {
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return c.db.Update(func(tx *bolt.Tx) error {
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if tx.Bucket(c.key) != nil {
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err := tx.DeleteBucket(c.key)
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if err != nil {
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return err
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}
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_, err = tx.CreateBucketIfNotExists(c.key)
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if err != nil {
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return err
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}
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}
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return nil
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})
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}
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