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main.go
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main.go
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package main
import (
"encoding/json"
"fmt"
"os"
"os/signal"
"runtime"
"syscall"
"github.com/aws/aws-lambda-go/events" // does not really use lambda, just the S3 event struct
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/aws/awserr"
"github.com/aws/aws-sdk-go/aws/endpoints"
"github.com/aws/aws-sdk-go/aws/session"
"github.com/aws/aws-sdk-go/service/s3"
"github.com/aws/aws-sdk-go/service/s3/s3iface"
"github.com/aws/aws-sdk-go/service/sns"
"github.com/aws/aws-sdk-go/service/sqs"
"github.com/aws/aws-sdk-go/service/sqs/sqsiface"
jobqueue "github.com/dirkaholic/kyoo"
"github.com/dirkaholic/kyoo/job"
"github.com/kelseyhightower/envconfig"
log "github.com/sirupsen/logrus"
)
const (
EnvironmentLocal = "local"
)
func main() {
log.SetOutput(os.Stdout)
var cfg Config
err := envconfig.Process("s3fileprocessor", &cfg)
if err != nil {
log.Fatal(err.Error())
}
if cfg.Debug {
log.SetLevel(log.DebugLevel)
}
sess := constructAWSSession(&cfg)
sqsSvc := sqs.New(sess)
s3Svc := s3.New(sess)
c := Consumer{
SQSSvc: sqsSvc,
S3Svc: s3Svc,
QueueName: cfg.Queue,
WorkerPool: runtime.NumCPU() * 2,
MaxMessages: 10, // 10 is current maximum value for MaxNumberOfMessages
}
sigChan := make(chan os.Signal)
signal.Notify(sigChan, os.Interrupt, syscall.SIGTERM)
go func() {
<-sigChan
c.Stop()
os.Exit(1)
}()
cErr := c.Consume()
if cErr != nil {
log.Fatalln("Error while running sqs consumer: ", cErr)
}
}
// constructAWSSession constructs an AWS session from the config parameters given
func constructAWSSession(cfg *Config) *session.Session {
defaultResolver := endpoints.DefaultResolver()
awsRegion := cfg.Region
if cfg.Environment == EnvironmentLocal {
awsRegion = "us-east-1"
}
resolverFn := func(service, region string, optFns ...func(*endpoints.Options)) (endpoints.ResolvedEndpoint, error) {
if cfg.Environment != EnvironmentLocal {
return defaultResolver.EndpointFor(service, region, optFns...)
}
var svcURL string
switch service {
case endpoints.SqsServiceID:
svcURL = "http://localhost:4576"
case endpoints.S3ServiceID:
svcURL = "http://localhost:4572"
default:
return defaultResolver.EndpointFor(service, region, optFns...)
}
log.Debugf("Retrieving local %s endpoint ...", service)
return endpoints.ResolvedEndpoint{
URL: svcURL,
SigningRegion: awsRegion,
}, nil
}
credVerboseErrors := true
sess := session.Must(session.NewSessionWithOptions(session.Options{
Config: aws.Config{
Region: aws.String(awsRegion),
EndpointResolver: endpoints.ResolverFunc(resolverFn),
CredentialsChainVerboseErrors: &credVerboseErrors,
},
}))
if cfg.DebugAWS {
sess.Config.MergeIn(&aws.Config{
LogLevel: aws.LogLevel(aws.LogDebug),
})
}
return sess
}
// Config represents configuration parameter read from the OS environment
type Config struct {
Debug bool `default:"false"`
DebugAWS bool `default:"false"`
Environment string `default:"prod"`
Region string `default:"eu-central-1"`
Queue string `required:"true"`
}
// Consumer defines SQS queue consumer
type Consumer struct {
SQSSvc sqsiface.SQSAPI
S3Svc s3iface.S3API
MaxMessages int64
WorkerPool int
QueueName string
queueURL *string
queue *jobqueue.JobQueue
}
// Consume starts consuming messages from SQS
func (c *Consumer) Consume() error {
err := c.resolveQueueURL()
if err != nil {
return err
}
// start job queue and pool of workers
c.queue = jobqueue.NewJobQueue(c.WorkerPool)
c.queue.Start()
log.Info("Start consuming messages with maxMessages set to: ", c.MaxMessages)
for !c.queue.Stopped() {
output, err := c.retrieveMessages(c.MaxMessages)
if err != nil {
log.Errorf("Error while retrieving messages: %s", err)
continue
}
log.Debugf("Retrieved %d messages from queue", len(output.Messages))
for _, message := range output.Messages {
m := message // local copy of the mesage, avoid data race
c.queue.Submit(&job.FuncExecutorJob{Func: func() error {
c.processSQSMessage(m)
return nil
}})
}
}
return nil
}
// Stop stops all workers and the queue gracefully
func (c *Consumer) Stop() {
log.Debugln("Stopping consumer ...")
c.queue.Stop()
}
// ConsumeSingleMessage consumes a single message from SQS
func (c *Consumer) ConsumeSingleMessage() error {
err := c.resolveQueueURL()
if err != nil {
return err
}
output, err := c.retrieveMessages(1)
if err != nil {
log.Errorf("Error while retrieving messages: %s", err)
return err
}
if len(output.Messages) > 0 {
c.processSQSMessage(output.Messages[0])
}
return nil
}
func (c *Consumer) resolveQueueURL() error {
qURL, err := c.SQSSvc.GetQueueUrl(&sqs.GetQueueUrlInput{
QueueName: aws.String(c.QueueName),
})
if err != nil {
if aerr, ok := err.(awserr.Error); ok && aerr.Code() == sqs.ErrCodeQueueDoesNotExist {
return fmt.Errorf("Unable to find queue %q", c.QueueName)
}
return fmt.Errorf("Unable to get URL for queue %q, %v", c.QueueName, err)
}
log.Debugf("Resolved queue URL output: %v", qURL)
c.queueURL = qURL.QueueUrl
return nil
}
func (c *Consumer) retrieveMessages(maxMessages int64) (*sqs.ReceiveMessageOutput, error) {
result, err := c.SQSSvc.ReceiveMessage(&sqs.ReceiveMessageInput{
AttributeNames: []*string{
aws.String(sqs.MessageSystemAttributeNameSentTimestamp),
},
MessageAttributeNames: []*string{
aws.String(sqs.QueueAttributeNameAll),
},
QueueUrl: c.queueURL,
MaxNumberOfMessages: aws.Int64(maxMessages),
VisibilityTimeout: aws.Int64(60), // 60 seconds
WaitTimeSeconds: aws.Int64(20), // current maximum in order to use longpolling
})
if err != nil {
return &sqs.ReceiveMessageOutput{}, err
}
return result, nil
}
func (c *Consumer) deleteMessage(message *sqs.Message) (*sqs.DeleteMessageOutput, error) {
resultDelete, err := c.SQSSvc.DeleteMessage(&sqs.DeleteMessageInput{
QueueUrl: c.queueURL,
ReceiptHandle: message.ReceiptHandle,
})
if err != nil {
return &sqs.DeleteMessageOutput{}, err
}
log.Debugf("Message %s deleted", *message.MessageId)
return resultDelete, nil
}
func (c *Consumer) processSQSMessage(m *sqs.Message) {
log.Debugf("Getting body: %s", *m.Body)
var snsMsg sns.PublishInput
snsErr := json.Unmarshal([]byte(*m.Body), &snsMsg)
if snsErr != nil {
log.Errorf("Error while unmarshaling SNS message: %s", snsErr)
}
log.Debugln("SNS message:", *snsMsg.Message)
var s3Event events.S3Event
err := json.Unmarshal([]byte(*snsMsg.Message), &s3Event)
if err != nil {
log.Errorf("Error while unmarshaling S3 event: %s", err)
}
for _, record := range s3Event.Records {
log.Debugf("Processing S3 event from bucket: %s", record.S3.Bucket.Name)
log.Debugf("Processing S3 object: %s", record.S3.Object.Key)
// Do further file processing here
}
// Message consumed
if _, err := c.deleteMessage(m); err != nil {
log.Errorf("Error while deleting message: %s", err)
}
}