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// Copyright 2020 The Matrix.org Foundation C.I.C.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package producers
import (
"context"
"encoding/json"
"github.com/Shopify/sarama"
"github.com/matrix-org/dendrite/keyserver/api"
"github.com/matrix-org/dendrite/keyserver/storage"
"github.com/sirupsen/logrus"
)
// KeyChange produces key change events for the sync API and federation sender to consume
type KeyChange struct {
Topic string
Producer sarama.SyncProducer
DB storage.Database
}
// DefaultPartition returns the default partition this process is sending key changes to.
// NB: A keyserver MUST send key changes to only 1 partition or else query operations will
// become inconsistent. Partitions can be sharded (e.g by hash of user ID of key change) but
// then all keyservers must be queried to calculate the entire set of key changes between
// two sync tokens.
func (p *KeyChange) DefaultPartition() int32 {
return 0
}
// ProduceKeyChanges creates new change events for each key
func (p *KeyChange) ProduceKeyChanges(keys []api.DeviceKeys) error {
for _, key := range keys {
var m sarama.ProducerMessage
value, err := json.Marshal(key)
if err != nil {
return err
}
m.Topic = string(p.Topic)
m.Key = sarama.StringEncoder(key.UserID)
m.Value = sarama.ByteEncoder(value)
partition, offset, err := p.Producer.SendMessage(&m)
if err != nil {
return err
}
err = p.DB.StoreKeyChange(context.Background(), partition, offset, key.UserID)
if err != nil {
return err
}
logrus.WithFields(logrus.Fields{
"user_id": key.UserID,
"device_id": key.DeviceID,
"partition": partition,
"offset": offset,
}).Infof("Produced to key change topic '%s'", p.Topic)
}
return nil
}
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