forked from aptly-dev/aptly
/
local.go
229 lines (194 loc) · 5.33 KB
/
local.go
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package deb
import (
"bytes"
"fmt"
"log"
"sync"
"github.com/smira/aptly/database"
"github.com/smira/go-uuid/uuid"
"github.com/ugorji/go/codec"
)
// LocalRepo is a collection of packages created locally
type LocalRepo struct {
// Permanent internal ID
UUID string `json:"-"`
// User-assigned name
Name string
// Comment
Comment string
// DefaultDistribution
DefaultDistribution string `codec:",omitempty"`
// DefaultComponent
DefaultComponent string `codec:",omitempty"`
// Uploaders configuration
Uploaders *Uploaders `code:",omitempty" json:"-"`
// "Snapshot" of current list of packages
packageRefs *PackageRefList
}
// NewLocalRepo creates new instance of Debian local repository
func NewLocalRepo(name string, comment string) *LocalRepo {
return &LocalRepo{
UUID: uuid.New(),
Name: name,
Comment: comment,
}
}
// String interface
func (repo *LocalRepo) String() string {
if repo.Comment != "" {
return fmt.Sprintf("[%s]: %s", repo.Name, repo.Comment)
}
return fmt.Sprintf("[%s]", repo.Name)
}
// NumPackages return number of packages in local repo
func (repo *LocalRepo) NumPackages() int {
if repo.packageRefs == nil {
return 0
}
return repo.packageRefs.Len()
}
// RefList returns package list for repo
func (repo *LocalRepo) RefList() *PackageRefList {
return repo.packageRefs
}
// UpdateRefList changes package list for local repo
func (repo *LocalRepo) UpdateRefList(reflist *PackageRefList) {
repo.packageRefs = reflist
}
// Encode does msgpack encoding of LocalRepo
func (repo *LocalRepo) Encode() []byte {
var buf bytes.Buffer
encoder := codec.NewEncoder(&buf, &codec.MsgpackHandle{})
encoder.Encode(repo)
return buf.Bytes()
}
// Decode decodes msgpack representation into LocalRepo
func (repo *LocalRepo) Decode(input []byte) error {
decoder := codec.NewDecoderBytes(input, &codec.MsgpackHandle{})
return decoder.Decode(repo)
}
// Key is a unique id in DB
func (repo *LocalRepo) Key() []byte {
return []byte("L" + repo.UUID)
}
// RefKey is a unique id for package reference list
func (repo *LocalRepo) RefKey() []byte {
return []byte("E" + repo.UUID)
}
// LocalRepoCollection does listing, updating/adding/deleting of LocalRepos
type LocalRepoCollection struct {
*sync.RWMutex
db database.Storage
list []*LocalRepo
}
// NewLocalRepoCollection loads LocalRepos from DB and makes up collection
func NewLocalRepoCollection(db database.Storage) *LocalRepoCollection {
result := &LocalRepoCollection{
RWMutex: &sync.RWMutex{},
db: db,
}
blobs := db.FetchByPrefix([]byte("L"))
result.list = make([]*LocalRepo, 0, len(blobs))
for _, blob := range blobs {
r := &LocalRepo{}
if err := r.Decode(blob); err != nil {
log.Printf("Error decoding repo: %s\n", err)
} else {
result.list = append(result.list, r)
}
}
return result
}
// Add appends new repo to collection and saves it
func (collection *LocalRepoCollection) Add(repo *LocalRepo) error {
for _, r := range collection.list {
if r.Name == repo.Name {
return fmt.Errorf("local repo with name %s already exists", repo.Name)
}
}
err := collection.Update(repo)
if err != nil {
return err
}
collection.list = append(collection.list, repo)
return nil
}
// Update stores updated information about repo in DB
func (collection *LocalRepoCollection) Update(repo *LocalRepo) error {
err := collection.db.Put(repo.Key(), repo.Encode())
if err != nil {
return err
}
if repo.packageRefs != nil {
err = collection.db.Put(repo.RefKey(), repo.packageRefs.Encode())
if err != nil {
return err
}
}
return nil
}
// LoadComplete loads additional information for local repo
func (collection *LocalRepoCollection) LoadComplete(repo *LocalRepo) error {
encoded, err := collection.db.Get(repo.RefKey())
if err == database.ErrNotFound {
return nil
}
if err != nil {
return err
}
repo.packageRefs = &PackageRefList{}
return repo.packageRefs.Decode(encoded)
}
// ByName looks up repository by name
func (collection *LocalRepoCollection) ByName(name string) (*LocalRepo, error) {
for _, r := range collection.list {
if r.Name == name {
return r, nil
}
}
return nil, fmt.Errorf("local repo with name %s not found", name)
}
// ByUUID looks up repository by uuid
func (collection *LocalRepoCollection) ByUUID(uuid string) (*LocalRepo, error) {
for _, r := range collection.list {
if r.UUID == uuid {
return r, nil
}
}
return nil, fmt.Errorf("local repo with uuid %s not found", uuid)
}
// ForEach runs method for each repository
func (collection *LocalRepoCollection) ForEach(handler func(*LocalRepo) error) error {
var err error
for _, r := range collection.list {
err = handler(r)
if err != nil {
return err
}
}
return err
}
// Len returns number of remote repos
func (collection *LocalRepoCollection) Len() int {
return len(collection.list)
}
// Drop removes remote repo from collection
func (collection *LocalRepoCollection) Drop(repo *LocalRepo) error {
repoPosition := -1
for i, r := range collection.list {
if r == repo {
repoPosition = i
break
}
}
if repoPosition == -1 {
panic("local repo not found!")
}
collection.list[len(collection.list)-1], collection.list[repoPosition], collection.list =
nil, collection.list[len(collection.list)-1], collection.list[:len(collection.list)-1]
err := collection.db.Delete(repo.Key())
if err != nil {
return err
}
return collection.db.Delete(repo.RefKey())
}