package bookpipeline import ( "errors" "fmt" "log" "os" "time" "github.com/aws/aws-sdk-go/aws" "github.com/aws/aws-sdk-go/aws/awserr" "github.com/aws/aws-sdk-go/aws/session" "github.com/aws/aws-sdk-go/service/ec2" "github.com/aws/aws-sdk-go/service/s3" "github.com/aws/aws-sdk-go/service/s3/s3manager" "github.com/aws/aws-sdk-go/service/sqs" ) const PreprocPattern = `_bin[0-9].[0-9].png` const heartbeatRetry = 10 type Qmsg struct { Id, Handle, Body string } type InstanceDetails struct { Id, Name, Ip, Spot, Type, State, LaunchTime string } type AwsConn struct { // these need to be set before running Init() Region string Logger *log.Logger // these are used internally sess *session.Session ec2svc *ec2.EC2 s3svc *s3.S3 sqssvc *sqs.SQS downloader *s3manager.Downloader uploader *s3manager.Uploader wipequrl, prequrl, ocrqurl, analysequrl string wipstorageid string } // TODO: split this up, as not everything is needed for different uses func (a *AwsConn) Init() error { if a.Region == "" { return errors.New("No Region set") } if a.Logger == nil { return errors.New("No logger set") } var err error a.sess, err = session.NewSession(&aws.Config{ Region: aws.String(a.Region), }) if err != nil { return errors.New(fmt.Sprintf("Failed to set up aws session: %s", err)) } a.ec2svc = ec2.New(a.sess) a.s3svc = s3.New(a.sess) a.sqssvc = sqs.New(a.sess) a.downloader = s3manager.NewDownloader(a.sess) a.uploader = s3manager.NewUploader(a.sess) a.Logger.Println("Getting preprocess queue URL") result, err := a.sqssvc.GetQueueUrl(&sqs.GetQueueUrlInput{ QueueName: aws.String("rescribepreprocess"), }) if err != nil { return errors.New(fmt.Sprintf("Error getting preprocess queue URL: %s", err)) } a.prequrl = *result.QueueUrl a.Logger.Println("Getting wipeonly queue URL") result, err = a.sqssvc.GetQueueUrl(&sqs.GetQueueUrlInput{ QueueName: aws.String("rescribewipeonly"), }) if err != nil { return errors.New(fmt.Sprintf("Error getting wipeonly queue URL: %s", err)) } a.wipequrl = *result.QueueUrl a.Logger.Println("Getting OCR queue URL") result, err = a.sqssvc.GetQueueUrl(&sqs.GetQueueUrlInput{ QueueName: aws.String("rescribeocr"), }) if err != nil { return errors.New(fmt.Sprintf("Error getting OCR queue URL: %s", err)) } a.ocrqurl = *result.QueueUrl a.Logger.Println("Getting analyse queue URL") result, err = a.sqssvc.GetQueueUrl(&sqs.GetQueueUrlInput{ QueueName: aws.String("rescribeanalyse"), }) if err != nil { return errors.New(fmt.Sprintf("Error getting analyse queue URL: %s", err)) } a.analysequrl = *result.QueueUrl a.wipstorageid = "rescribeinprogress" return nil } func (a *AwsConn) CheckQueue(url string, timeout int64) (Qmsg, error) { msgResult, err := a.sqssvc.ReceiveMessage(&sqs.ReceiveMessageInput{ MaxNumberOfMessages: aws.Int64(1), VisibilityTimeout: &timeout, WaitTimeSeconds: aws.Int64(20), QueueUrl: &url, }) if err != nil { return Qmsg{}, err } if len(msgResult.Messages) > 0 { msg := Qmsg{Id: *msgResult.Messages[0].MessageId, Handle: *msgResult.Messages[0].ReceiptHandle, Body: *msgResult.Messages[0].Body} a.Logger.Println("Message received:", msg.Body) return msg, nil } else { return Qmsg{}, nil } } // QueueHeartbeat updates the visibility timeout of a message. This // ensures that the message remains "in flight", meaning that it // cannot be seen by other processes, but if this process fails the // timeout will expire and it will go back to being available for // any other process to retrieve and process. // // SQS only allows messages to be "in flight" for up to 12 hours, so // this will detect if the request for an update to visibility timeout // fails, and if so will attempt to find the message on the queue, and // return it, as the handle will have changed. func (a *AwsConn) QueueHeartbeat(msg Qmsg, qurl string, duration int64) (Qmsg, error) { _, err := a.sqssvc.ChangeMessageVisibility(&sqs.ChangeMessageVisibilityInput{ ReceiptHandle: &msg.Handle, QueueUrl: &qurl, VisibilityTimeout: &duration, }) if err != nil { aerr, ok := err.(awserr.Error) // Check if the visibility timeout has exceeded the maximum allowed, // and if so try to find the message again to get a new handle. if ok && aerr.Code() == "InvalidParameterValue" { // Try heartbeatRetry times to find the message for range [heartbeatRetry]bool{} { // Wait a little in case existing visibilitytimeout needs to expire time.Sleep((time.Duration(duration) / heartbeatRetry) * time.Second) msgResult, err := a.sqssvc.ReceiveMessage(&sqs.ReceiveMessageInput{ MaxNumberOfMessages: aws.Int64(10), VisibilityTimeout: &duration, WaitTimeSeconds: aws.Int64(20), QueueUrl: &qurl, }) if err != nil { return Qmsg{}, errors.New(fmt.Sprintf("Heartbeat error looking for message to update heartbeat: %s", err)) } for _, m := range msgResult.Messages { if *m.MessageId == msg.Id { return Qmsg{ Id: *m.MessageId, Handle: *m.ReceiptHandle, Body: *m.Body, }, nil } } } return Qmsg{}, errors.New("Heartbeat error failed to find message to update heartbeat") } else { return Qmsg{}, errors.New(fmt.Sprintf("Heartbeat error updating queue duration: %s", err)) } } return Qmsg{}, nil } // GetQueueDetails gets the number of in progress and available // messages for a queue. These are returned as strings. func (a *AwsConn) GetQueueDetails(url string) (string, string, error) { numAvailable := "ApproximateNumberOfMessages" numInProgress := "ApproximateNumberOfMessagesNotVisible" attrs, err := a.sqssvc.GetQueueAttributes(&sqs.GetQueueAttributesInput{ AttributeNames: []*string{&numAvailable, &numInProgress}, QueueUrl: &url, }) if err != nil { return "", "", errors.New(fmt.Sprintf("Failed to get queue attributes: %s", err)) } return *attrs.Attributes[numAvailable], *attrs.Attributes[numInProgress], nil } func (a *AwsConn) PreQueueId() string { return a.prequrl } func (a *AwsConn) WipeQueueId() string { return a.wipequrl } func (a *AwsConn) OCRQueueId() string { return a.ocrqurl } func (a *AwsConn) AnalyseQueueId() string { return a.analysequrl } func (a *AwsConn) WIPStorageId() string { return a.wipstorageid } func (a *AwsConn) ListObjects(bucket string, prefix string) ([]string, error) { var names []string err := a.s3svc.ListObjectsV2Pages(&s3.ListObjectsV2Input{ Bucket: aws.String(bucket), Prefix: aws.String(prefix), }, func(page *s3.ListObjectsV2Output, last bool) bool { for _, r := range page.Contents { names = append(names, *r.Key) } return true }) return names, err } func (a *AwsConn) AddToQueue(url string, msg string) error { _, err := a.sqssvc.SendMessage(&sqs.SendMessageInput{ MessageBody: &msg, QueueUrl: &url, }) return err } func (a *AwsConn) DelFromQueue(url string, handle string) error { _, err := a.sqssvc.DeleteMessage(&sqs.DeleteMessageInput{ QueueUrl: &url, ReceiptHandle: &handle, }) return err } func (a *AwsConn) Download(bucket string, key string, path string) error { f, err := os.Create(path) if err != nil { return err } defer f.Close() _, err = a.downloader.Download(f, &s3.GetObjectInput{ Bucket: aws.String(bucket), Key: &key, }) return err } func (a *AwsConn) Upload(bucket string, key string, path string) error { file, err := os.Open(path) if err != nil { log.Fatalln("Failed to open file", path, err) } defer file.Close() _, err = a.uploader.Upload(&s3manager.UploadInput{ Bucket: aws.String(bucket), Key: aws.String(key), Body: file, }) return err } func (a *AwsConn) GetLogger() *log.Logger { return a.Logger } func instanceDetailsFromPage(page *ec2.DescribeInstancesOutput) []InstanceDetails { var details []InstanceDetails for _, r := range page.Reservations { for _, i := range r.Instances { var d InstanceDetails for _, t := range i.Tags { if *t.Key == "Name" { d.Name = *t.Value } } if i.PublicIpAddress != nil { d.Ip = *i.PublicIpAddress } if i.SpotInstanceRequestId != nil { d.Spot = *i.SpotInstanceRequestId } d.Type = *i.InstanceType d.Id = *i.InstanceId d.LaunchTime = i.LaunchTime.String() d.State = *i.State.Name details = append(details, d) } } return details } func (a *AwsConn) GetInstanceDetails() ([]InstanceDetails, error) { var details []InstanceDetails err := a.ec2svc.DescribeInstancesPages(&ec2.DescribeInstancesInput{}, func(page *ec2.DescribeInstancesOutput, lastPage bool) bool { for _, d := range instanceDetailsFromPage(page) { details = append(details, d) } return !lastPage }) return details, err }