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sqsconsumer.go
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sqsconsumer.go
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/*
Copyright 2021 Adevinta
*/
package queue
import (
"context"
"errors"
"fmt"
"sync"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/aws/arn"
"github.com/aws/aws-sdk-go/aws/awserr"
"github.com/aws/aws-sdk-go/aws/request"
"github.com/aws/aws-sdk-go/aws/session"
"github.com/aws/aws-sdk-go/service/sqs"
"github.com/aws/aws-sdk-go/service/sqs/sqsiface"
"github.com/go-kit/log"
"github.com/go-kit/log/level"
)
const (
maxNumberOfMsg = 10
)
var (
errInvalidEvent = errors.New("invalid event")
errErrorReadCanceled = errors.New("canceled read from sqs")
)
// Config holds the required sqs config information.
type Config struct {
NumberOfProcessors uint8 `mapstructure:"number_of_processors"`
Endpoint string `mapstructure:"endpoint"`
QueueArn string `mapstructure:"queue_arn"`
WaitTime int64 `mapstructure:"wait_time"`
Timeout int64 `mapstructure:"timeout"`
Disabled bool `mapstructure:"disabled"`
LogMessages bool `mapstructure:"log_messages"`
}
type messageStore interface {
CreateDocument(doc interface{}, data []byte) (int64, error)
}
// MessageProcessor defines the functions required by the SQSConsumer to process a message.
type MessageProcessor interface {
Process(context.Context, []byte) error
}
// SQSConsumer reads and consumes sqs messages.
type SQSConsumer struct {
sqs sqsiface.SQSAPI
processor MessageProcessor
store messageStore
logger log.Logger
receiveParams sqs.ReceiveMessageInput
maxWaitTime int64
logMessages bool
disabled bool
}
// UpdateProcessorGroup defines a group of check notification processors.
type UpdateProcessorGroup struct {
consumers []*SQSConsumer
wg *sync.WaitGroup
}
// NewUpdateProcessorGroup creates a ProcessorGroup using the given config,
// message processor and logger.
func NewUpdateProcessorGroup(c Config, processor MessageProcessor, store messageStore, log log.Logger) (UpdateProcessorGroup, error) {
var consumerGroup UpdateProcessorGroup
consumers := []*SQSConsumer{}
for i := uint8(0); i < c.NumberOfProcessors; i++ {
consumer, err := NewConsumer(c, processor, store, log)
if err != nil {
return consumerGroup, err // nolint
}
consumers = append(consumers, consumer)
}
consumerGroup.consumers = consumers
consumerGroup.wg = &sync.WaitGroup{}
return consumerGroup, nil // nolint
}
// StartProcessing signals all the consumers in the group to start processing
// messages in the queue.
func (u *UpdateProcessorGroup) StartProcessing(ctx context.Context) {
for _, c := range u.consumers {
cCtx, _ := context.WithCancel(ctx)
u.wg.Add(1)
go c.StarProcessing(cCtx, u.wg)
}
}
// WaitFinish locks the calling goroutine until all the consumers finished
// processing messages.
func (u *UpdateProcessorGroup) WaitFinish() {
u.wg.Wait()
}
// NewConsumer creates and initializes an SQSConsumer.
func NewConsumer(c Config, processor MessageProcessor, store messageStore, log log.Logger) (*SQSConsumer, error) {
var consumer *SQSConsumer
if c.Disabled {
_ = level.Info(log).Log("SQSConsumerDisabled", true)
return &SQSConsumer{
logger: log,
disabled: true,
}, nil
}
sess, err := session.NewSession()
if err != nil {
_ = level.Error(log).Log("CreatingAWSSession", err)
return consumer, err
}
arn, err := arn.Parse(c.QueueArn)
if err != nil {
_ = level.Error(log).Log("ParsingSQSQueueARN", err)
return nil, fmt.Errorf("error parsing SQS queue ARN: %v", err)
}
awsCfg := aws.NewConfig()
if arn.Region != "" {
awsCfg = awsCfg.WithRegion(arn.Region)
}
if c.Endpoint != "" {
awsCfg = awsCfg.WithEndpoint(c.Endpoint)
}
srv := sqs.New(sess, awsCfg)
params := &sqs.GetQueueUrlInput{
QueueName: aws.String(arn.Resource),
}
if arn.AccountID != "" {
params.SetQueueOwnerAWSAccountId(arn.AccountID)
}
resp, err := srv.GetQueueUrl(params)
if err != nil {
_ = level.Error(log).Log("ErrorRetrievingSQSURL", err)
return consumer, fmt.Errorf("error retrieving SQS queue URL: %v", err)
}
receiveParams := sqs.ReceiveMessageInput{
QueueUrl: aws.String(*resp.QueueUrl),
MaxNumberOfMessages: aws.Int64(maxNumberOfMsg),
WaitTimeSeconds: aws.Int64(0),
VisibilityTimeout: aws.Int64(c.Timeout),
}
return &SQSConsumer{
logMessages: c.LogMessages,
disabled: c.Disabled,
store: store,
processor: processor,
logger: log,
sqs: srv,
receiveParams: receiveParams,
maxWaitTime: c.WaitTime,
}, nil
}
// StarProcessing stars processing messages by reading from the queue an passing them to the MessageProcessor.
func (s *SQSConsumer) StarProcessing(ctx context.Context, wg *sync.WaitGroup) {
defer wg.Done()
if s.disabled {
_ = level.Info(s.logger).Log("SQSConsumerDisabled", s.disabled)
return
}
_ = level.Info(s.logger).Log("SQSConsumerLogMessages", s.logMessages)
var exit bool
for !exit {
select {
case <-ctx.Done():
exit = true
default:
err := s.readAndProcess(ctx)
if err != nil {
_ = level.Error(s.logger).Log("ErrorReadingMessages", err)
}
}
}
}
func (s *SQSConsumer) readAndProcess(ctx context.Context) error {
resp, err := s.sqs.ReceiveMessageWithContext(ctx, &s.receiveParams)
if err != nil {
if aerr, ok := err.(awserr.Error); ok && aerr.Code() == request.CanceledErrorCode {
return errErrorReadCanceled
}
return err
}
if len(resp.Messages) == 0 {
s.receiveParams.WaitTimeSeconds = aws.Int64(s.maxWaitTime)
return nil
}
s.receiveParams.WaitTimeSeconds = aws.Int64(0)
for _, m := range resp.Messages {
if m == nil {
_ = level.Error(s.logger).Log("GotNilSQSMessage")
continue
}
if m.Body == nil {
_ = level.Error(s.logger).Log("SQSMessageWithoutBody", m)
// Invalid message delete from queue without processing.
_, err := s.sqs.DeleteMessage(&sqs.DeleteMessageInput{
ReceiptHandle: m.ReceiptHandle,
QueueUrl: s.receiveParams.QueueUrl,
})
if err != nil {
_ = level.Error(s.logger).Log("ErrorDeletingProcessedMessage", err.Error())
}
continue
}
err := s.process(ctx, *m)
if err != nil {
// Do not delete messages incorrectly processed.
_ = level.Error(s.logger).Log("ErrorProcessingSQSMessage", err.Error(), "MessageID", *m.MessageId)
continue
}
_, err = s.sqs.DeleteMessage(&sqs.DeleteMessageInput{
ReceiptHandle: m.ReceiptHandle,
QueueUrl: s.receiveParams.QueueUrl,
})
if err != nil {
_ = level.Error(s.logger).Log("ErrorDeletingSQSMessage", err)
continue
}
if s.logMessages {
_, err = s.store.CreateDocument(*m, []byte(*m.Body))
if err != nil {
_ = level.Error(s.logger).Log("ErrorStoringProcessedMessage", err)
continue
}
}
err = level.Info(s.logger).Log("MsgProcessed", string(*m.MessageId))
if err != nil {
fmt.Printf("Error writting to log %v", err)
}
}
return nil
}
func (s *SQSConsumer) process(ctx context.Context, m sqs.Message) error {
_ = level.Info(s.logger).Log("ProcessingMessageWithID", *m.MessageId)
if m.Body == nil {
return errInvalidEvent
}
_ = level.Debug(s.logger).Log("MessageBody", string(*m.Body))
return s.processor.Process(ctx, []byte(*m.Body))
}