mirror of
https://github.com/hexolan/panels.git
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90 lines
2.6 KiB
Go
90 lines
2.6 KiB
Go
// Copyright 2023 Declan Teevan
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package consumers
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import (
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"context"
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"github.com/rs/zerolog/log"
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"github.com/segmentio/kafka-go"
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"google.golang.org/protobuf/proto"
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"github.com/hexolan/panels/post-service/internal"
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"github.com/hexolan/panels/post-service/internal/kafka/consumers/userv1"
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"github.com/hexolan/panels/post-service/internal/kafka/producer"
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)
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type UserEventConsumer struct {
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reader *kafka.Reader
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dbRepo internal.PostDBRepository
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eventProd producer.PostEventProducer
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}
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func NewUserEventConsumer(cfg internal.Config, dbRepo internal.PostDBRepository, eventProd producer.PostEventProducer) UserEventConsumer {
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return UserEventConsumer{
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reader: kafka.NewReader(kafka.ReaderConfig{
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Brokers: cfg.KafkaBrokers,
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GroupID: "post-service",
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Topic: "user",
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}),
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dbRepo: dbRepo,
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}
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}
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func (ec UserEventConsumer) ProcessEvent(evt *userv1.UserEvent) {
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if evt.GetData() == nil {
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log.Error().Str("src", "user-event-consumer").Any("event", evt).Msg("no event data provided")
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return
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}
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if evt.Type == "deleted" {
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postIds, err := ec.dbRepo.DeletePostsByUser(context.Background(), evt.GetData().GetId())
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if err == nil {
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for _, postId := range postIds {
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ec.eventProd.DispatchDeletedEvent(postId)
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}
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}
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log.Debug().Str("src", "user-event-consumer").Any("event", evt).Msg("processed user deleted event")
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}
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}
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func (ec UserEventConsumer) ProcessMessage(msg kafka.Message) {
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var evt userv1.UserEvent
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err := proto.Unmarshal(msg.Value, &evt)
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if err != nil {
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log.Error().Err(err).Str("src", "user-event-consumer").Msg("failed to unmarshal event")
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return
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}
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ec.ProcessEvent(&evt)
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}
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func (ec UserEventConsumer) Start() {
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for {
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msg, err := ec.reader.FetchMessage(context.Background())
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if err != nil {
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log.Error().Err(err).Str("src", "user-event-consumer").Msg("failed to fetch msg from Kafka")
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break
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}
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ec.ProcessMessage(msg)
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}
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// Attempt to close the reader connection (after experiencing a Kafka error)
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if err := ec.reader.Close(); err != nil {
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log.Panic().Err(err).Str("src", "user-event-consumer").Msg("failed to close Kafka reader")
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}
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}
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