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manager.go
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/
manager.go
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package db
import (
"context"
"errors"
"fmt"
"io"
"strings"
ds "github.com/ipfs/go-datastore"
kt "github.com/ipfs/go-datastore/keytransform"
"github.com/ipfs/go-datastore/query"
logging "github.com/ipfs/go-log"
"github.com/libp2p/go-libp2p-core/crypto"
ma "github.com/multiformats/go-multiaddr"
"github.com/textileio/go-threads/core/net"
"github.com/textileio/go-threads/core/thread"
"github.com/textileio/go-threads/util"
)
var (
dsDBManagerBaseKey = ds.NewKey("/manager")
dsDBAuthor = ds.NewKey("/author")
dsDBSignature = ds.NewKey("/signature")
)
type Manager struct {
io.Closer
config *Config
network net.Net
dbs map[thread.ID]*DB
}
// NewManager hydrates dbs from prefixes and starts them.
func NewManager(network net.Net, opts ...Option) (*Manager, error) {
config := &Config{}
for _, opt := range opts {
if err := opt(config); err != nil {
return nil, err
}
}
if config.Datastore == nil {
datastore, err := newDefaultDatastore(config.RepoPath, config.LowMem)
if err != nil {
return nil, err
}
config.Datastore = datastore
}
if config.Debug {
if err := util.SetLogLevels(map[string]logging.LogLevel{
"db": logging.LevelDebug,
}); err != nil {
return nil, err
}
}
m := &Manager{
config: config,
network: network,
dbs: make(map[thread.ID]*DB),
}
results, err := m.config.Datastore.Query(query.Query{
Prefix: dsDBManagerBaseKey.String(),
KeysOnly: true,
})
if err != nil {
return nil, err
}
defer results.Close()
for res := range results.Next() {
parts := strings.Split(ds.RawKey(res.Key).String(), "/")
if len(parts) < 3 {
continue
}
id, err := thread.Decode(parts[2])
if err != nil {
continue
}
if _, ok := m.dbs[id]; ok {
continue
}
creds, err := m.getDBCreds(id)
if err != nil {
return nil, err
}
s, err := newDB(m.network, creds, getDBConfig(id, m.config))
if err != nil {
return nil, err
}
m.dbs[id] = s
}
return m, nil
}
// NewDB creates a new db and prefixes its datastore with base key.
func (m *Manager) NewDB(ctx context.Context, creds thread.Credentials, collections ...CollectionConfig) (*DB, error) {
id := creds.ThreadID()
if _, ok := m.dbs[id]; ok {
return nil, fmt.Errorf("db %s already exists", id)
}
if _, err := m.network.CreateThread(ctx, creds); err != nil {
return nil, err
}
if err := m.putDBCreds(id, creds); err != nil {
return nil, err
}
db, err := newDB(m.network, creds, getDBConfig(id, m.config, collections...))
if err != nil {
return nil, err
}
m.dbs[id] = db
return db, nil
}
// NewDBFromAddr creates a new db from address and prefixes its datastore with base key.
// Unlike NewDB, this method takes a list of collections added to the original db that
// should also be added to this host.
func (m *Manager) NewDBFromAddr(ctx context.Context, creds thread.Credentials, addr ma.Multiaddr, key thread.Key, collections ...CollectionConfig) (*DB, error) {
id := creds.ThreadID()
if _, ok := m.dbs[id]; ok {
return nil, fmt.Errorf("db %s already exists", id)
}
if _, err := m.network.AddThread(ctx, creds, addr, net.WithThreadKey(key)); err != nil {
return nil, err
}
if err := m.putDBCreds(id, creds); err != nil {
return nil, err
}
db, err := newDB(m.network, creds, getDBConfig(id, m.config, collections...))
if err != nil {
return nil, err
}
m.dbs[id] = db
go func() {
if err := m.network.PullThread(ctx, creds); err != nil {
log.Errorf("error pulling thread %s", id)
}
}()
return db, nil
}
// GetDB returns a db by id.
func (m *Manager) GetDB(creds thread.Credentials) *DB {
return m.dbs[creds.ThreadID()]
}
// DeleteDB deletes a db by id.
func (m *Manager) DeleteDB(ctx context.Context, creds thread.Credentials) error {
id := creds.ThreadID()
db := m.dbs[id]
if db == nil {
return nil
}
if err := db.Close(); err != nil {
return err
}
if err := m.network.DeleteThread(ctx, creds); err != nil {
return err
}
// Cleanup keys used by the db
pre := dsDBManagerBaseKey.ChildString(id.String())
q := query.Query{Prefix: pre.String(), KeysOnly: true}
results, err := m.config.Datastore.Query(q)
if err != nil {
return err
}
defer results.Close()
for result := range results.Next() {
if err := m.config.Datastore.Delete(ds.NewKey(result.Key)); err != nil {
return err
}
}
delete(m.dbs, id)
return nil
}
// Net returns the manager's thread network.
func (m *Manager) Net() net.Net {
return m.network
}
// Close all dbs.
func (m *Manager) Close() error {
for _, s := range m.dbs {
if err := s.Close(); err != nil {
log.Error("error when closing manager datastore: %v", err)
}
}
return m.config.Datastore.Close()
}
// getDBConfig copies the manager's base config,
// wraps the datastore with an id prefix,
// and merges specified collection configs with those from base
func getDBConfig(id thread.ID, base *Config, collections ...CollectionConfig) *Config {
return &Config{
RepoPath: base.RepoPath,
Datastore: wrapTxnDatastore(base.Datastore, kt.PrefixTransform{
Prefix: dsDBManagerBaseKey.ChildString(id.String()),
}),
EventCodec: base.EventCodec,
Debug: base.Debug,
Collections: append(base.Collections, collections...),
}
}
// putDBCreds persists db creds for a thread.
func (m *Manager) putDBCreds(id thread.ID, creds thread.Credentials) error {
pk, sig, err := creds.Sign()
if err != nil {
return err
}
if pk == nil {
return nil
}
pkb, err := crypto.MarshalPublicKey(pk)
if err != nil {
return err
}
ak := dsDBManagerBaseKey.ChildString(id.String()).Child(dsDBAuthor)
if err = m.config.Datastore.Put(ak, pkb); err != nil {
return err
}
sk := dsDBManagerBaseKey.ChildString(id.String()).Child(dsDBSignature)
return m.config.Datastore.Put(sk, sig)
}
// getDBCreds loads a db author from the datastore.
func (m *Manager) getDBCreds(id thread.ID) (thread.Credentials, error) {
ak := dsDBManagerBaseKey.ChildString(id.String()).Child(dsDBAuthor)
pkb, err := m.config.Datastore.Get(ak)
if err != nil && !errors.Is(err, ds.ErrNotFound) {
return nil, err
}
var sig []byte
if pkb != nil {
sk := dsDBManagerBaseKey.ChildString(id.String()).Child(dsDBSignature)
sig, err = m.config.Datastore.Get(sk)
if err != nil {
return nil, err
}
}
return thread.NewSignedCredsFromBytes(id.Bytes(), pkb, sig)
}