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pubsub.go
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pubsub.go
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// Copyright 2023 Stichting ThingsIX Foundation
//
// 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.
//
// SPDX-License-Identifier: Apache-2.0
package pubsub
import (
"context"
"encoding/json"
"cloud.google.com/go/pubsub"
"github.com/ThingsIXFoundation/data-aggregator/config"
"github.com/ThingsIXFoundation/data-aggregator/mapping/source/interfac"
"github.com/ThingsIXFoundation/types"
"github.com/sirupsen/logrus"
"github.com/spf13/viper"
)
type PubSub struct {
pubSub *pubsub.Client
mappingFunc interfac.MappingFunc
}
var _ interfac.Source = (*PubSub)(nil)
func NewPubSub(ctx context.Context) (*PubSub, error) {
pubSub, err := pubsub.NewClient(ctx, viper.GetString(config.CONFIG_PUBSUB_PROJECT))
if err != nil {
return nil, err
}
return &PubSub{
pubSub: pubSub,
}, nil
}
func (ps *PubSub) Run(ctx context.Context) error {
err := ps.pubSub.Subscription("verified-mapping-datastore").Receive(ctx, ps.receiveMessage)
if err != nil {
logrus.WithError(err).Error("error while receiving verified mappings")
return err
}
return nil
}
func (ps *PubSub) receiveMessage(ctx context.Context, m *pubsub.Message) {
var mappingRecord types.MappingRecord
err := json.Unmarshal(m.Data, &mappingRecord)
if err != nil {
logrus.WithError(err).Error("error while decoding mapping record")
m.Nack()
}
err = ps.mappingFunc(ctx, &mappingRecord)
if err != nil {
logrus.WithError(err).Error("error while handling mapping record")
m.Nack()
}
m.Ack()
}
func (ps *PubSub) SetFuncs(mappingFunc interfac.MappingFunc) {
ps.mappingFunc = mappingFunc
}