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persist.go
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/
persist.go
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package mongodb
import (
"context"
"errors"
"fmt"
"github.com/plgd-dev/hub/v2/identity-store/persistence"
"go.mongodb.org/mongo-driver/bson"
"go.mongodb.org/mongo-driver/mongo"
"go.mongodb.org/mongo-driver/mongo/options"
)
const (
deviceIDKey = "_id"
ownerKey = "owner"
)
// PersistenceTx prevents data race for a sequence of read and write operations.
type PersistenceTx struct {
tx mongo.Session
dbname string
err error
ctx context.Context
}
// NewTransaction creates a new transaction.
// A transaction must always be closed:
//
// tx := s.persistence.NewTransaction()
// defer tx.Close()
func (p *Store) NewTransaction(ctx context.Context) persistence.PersistenceTx {
tx, err := p.Client().StartSession()
if err == nil {
err = tx.StartTransaction()
if err != nil {
tx.EndSession(ctx)
}
}
return &PersistenceTx{tx: tx, dbname: p.DBName(), err: err, ctx: ctx}
}
// Retrieve device's authorization details.
func (p *PersistenceTx) Retrieve(deviceID, userID string) (_ *persistence.AuthorizedDevice, ok bool, err error) {
if p.err != nil {
return nil, false, p.err
}
col := p.tx.Client().Database(p.dbname).Collection(userDevicesCName)
iter, err := col.Find(p.ctx, bson.M{deviceIDKey: deviceID, ownerKey: userID}, &options.FindOptions{
Hint: userDeviceQueryIndex,
})
if errors.Is(err, mongo.ErrNilDocument) {
return nil, false, nil
}
if err != nil {
return nil, false, err
}
it := iterator{
iter: iter,
ctx: p.ctx,
}
defer it.Close()
var d persistence.AuthorizedDevice
ok = it.Next(&d)
if it.Err() != nil {
return nil, ok, it.Err()
}
return &d, ok, nil
}
// RetrieveByDevice device's authorization details.
func (p *PersistenceTx) RetrieveByDevice(deviceID string) (_ *persistence.AuthorizedDevice, ok bool, err error) {
if p.err != nil {
err = p.err
return
}
col := p.tx.Client().Database(p.dbname).Collection(userDevicesCName)
iter, err := col.Find(p.ctx, bson.M{deviceIDKey: deviceID})
if errors.Is(err, mongo.ErrNilDocument) {
err = nil
return
}
if err != nil {
return
}
it := iterator{
iter: iter,
ctx: p.ctx,
}
defer it.Close()
var d persistence.AuthorizedDevice
ok = it.Next(&d)
if it.Err() != nil {
err = it.Err()
return
}
return &d, ok, nil
}
// RetrieveAll retrieves all owner's authorized devices.
func (p *PersistenceTx) RetrieveByOwner(owner string) persistence.Iterator {
if p.err != nil {
return &iterator{err: p.err}
}
col := p.tx.Client().Database(p.dbname).Collection(userDevicesCName)
iter, err := col.Find(p.ctx, bson.M{ownerKey: owner}, &options.FindOptions{
Hint: userDevicesQueryIndex,
})
if errors.Is(err, mongo.ErrNilDocument) {
return &iterator{}
}
if err != nil {
return &iterator{err: fmt.Errorf("cannot load all devices subscription: %w", err)}
}
return &iterator{
iter: iter,
ctx: p.ctx,
}
}
// RetrieveAll retrieves all user's authorized devices.
func (p *PersistenceTx) RetrieveAll() persistence.Iterator {
if p.err != nil {
return &iterator{err: p.err}
}
col := p.tx.Client().Database(p.dbname).Collection(userDevicesCName)
iter, err := col.Find(p.ctx, bson.M{})
if errors.Is(err, mongo.ErrNilDocument) {
return &iterator{}
}
if err != nil {
return &iterator{err: fmt.Errorf("cannot load all devices subscription: %w", err)}
}
return &iterator{
iter: iter,
ctx: p.ctx,
}
}
type iterator struct {
err error
iter *mongo.Cursor
ctx context.Context
}
func (i *iterator) Next(s *persistence.AuthorizedDevice) bool {
if i.err != nil {
return false
}
var sub bson.M
if !i.iter.Next(i.ctx) {
return false
}
err := i.iter.Decode(&sub)
if err != nil {
return false
}
s.DeviceID = sub[deviceIDKey].(string)
s.Owner = sub[ownerKey].(string)
return true
}
func (i *iterator) Err() error {
if i.iter != nil {
return i.iter.Err()
}
return i.err
}
func (i *iterator) Close() {
if i.iter != nil {
i.err = i.iter.Close(i.ctx)
}
}
func makeRecord(d *persistence.AuthorizedDevice) bson.M {
return bson.M{
deviceIDKey: d.DeviceID,
ownerKey: d.Owner,
}
}
// Persist device's authorization details.
func (p *PersistenceTx) Persist(d *persistence.AuthorizedDevice) error {
if p.err != nil {
return p.err
}
record := makeRecord(d)
col := p.tx.Client().Database(p.dbname).Collection(userDevicesCName)
upsert := true
if _, err := col.UpdateOne(p.ctx, bson.M{deviceIDKey: d.DeviceID}, bson.M{"$set": record}, &options.UpdateOptions{
Upsert: &upsert,
}); err != nil {
return err
}
if err := p.tx.CommitTransaction(p.ctx); err != nil {
return fmt.Errorf("cannot commit transaction: %w", err)
}
return nil
}
// Delete removes the device's authorization record.
func (p *PersistenceTx) Delete(deviceID, userID string) error {
if p.err != nil {
return p.err
}
col := p.tx.Client().Database(p.dbname).Collection(userDevicesCName)
res, err := col.DeleteOne(p.ctx, bson.M{
deviceIDKey: deviceID,
ownerKey: userID,
})
if err != nil {
return err
}
if res.DeletedCount == 0 {
return fmt.Errorf("not found")
}
if err := p.tx.CommitTransaction(p.ctx); err != nil {
return fmt.Errorf("cannot commit transaction: %w", err)
}
return nil
}
// Close must always be called (use defer immediately after NewTransaction).
func (p *PersistenceTx) Close() {
if p.tx != nil {
p.tx.EndSession(p.ctx)
}
}