From bd8688f692bc8cf8836893bf42fdc46e8fb236bf Mon Sep 17 00:00:00 2001 From: Nick White Date: Tue, 20 Aug 2019 10:25:29 +0100 Subject: Split aws implementation from main.go in pipelinepreprocess --- pipelinepreprocess/aws.go | 205 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 205 insertions(+) create mode 100644 pipelinepreprocess/aws.go (limited to 'pipelinepreprocess/aws.go') diff --git a/pipelinepreprocess/aws.go b/pipelinepreprocess/aws.go new file mode 100644 index 0000000..bb969ed --- /dev/null +++ b/pipelinepreprocess/aws.go @@ -0,0 +1,205 @@ +package main + +import ( + "errors" + "fmt" + "log" + "os" + "regexp" + "time" + + "github.com/aws/aws-sdk-go/aws" + "github.com/aws/aws-sdk-go/aws/session" + "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 HeartbeatTime = 60 + +type awsConn struct { + // these need to be set before running Init() + region string + logger *log.Logger + + // these are used internally + sess *session.Session + s3svc *s3.S3 + sqssvc *sqs.SQS + downloader *s3manager.Downloader + uploader *s3manager.Uploader + prequrl, ocrqurl string +} + +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.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 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 + return nil +} + +func (a *awsConn) CheckQueue(url string) (Qmsg, error) { + msgResult, err := a.sqssvc.ReceiveMessage(&sqs.ReceiveMessageInput{ + MaxNumberOfMessages: aws.Int64(1), + VisibilityTimeout: aws.Int64(HeartbeatTime * 2), + WaitTimeSeconds: aws.Int64(20), + QueueUrl: &url, + }) + if err != nil { + return Qmsg{}, err + } + + if len(msgResult.Messages) > 0 { + msg := Qmsg{ Handle: *msgResult.Messages[0].ReceiptHandle, Body: *msgResult.Messages[0].Body } + a.logger.Println("Message received:", msg.Body) + return msg, nil + } else { + return Qmsg{}, nil + } +} + +func (a *awsConn) CheckPreQueue() (Qmsg, error) { + a.logger.Println("Checking preprocessing queue for new messages") + return a.CheckQueue(a.prequrl) +} + +func (a *awsConn) QueueHeartbeat(t *time.Ticker, msgHandle string, qurl string) error { + for _ = range t.C { + duration := int64(HeartbeatTime * 2) + _, err := a.sqssvc.ChangeMessageVisibility(&sqs.ChangeMessageVisibilityInput{ + ReceiptHandle: &msgHandle, + QueueUrl: &qurl, + VisibilityTimeout: &duration, + }) + if err != nil { + return errors.New(fmt.Sprintf("Heartbeat error updating queue duration: %s", err)) + } + } + return nil +} + +func (a *awsConn) PreQueueHeartbeat(t *time.Ticker, msgHandle string) error { + a.logger.Println("Starting preprocess queue heartbeat for", msgHandle) + return a.QueueHeartbeat(t, msgHandle, a.prequrl) +} + +func (a *awsConn) ListObjects(bucket string, prefix string, names chan string) error { + alreadydone := regexp.MustCompile(PreprocPattern) + 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 { + if alreadydone.MatchString(*r.Key) { + a.logger.Println("Skipping item that looks like it has already been processed", *r.Key) + continue + } + names <- *r.Key + } + return true + }) + close(names) + return err +} + +func (a *awsConn) ListInProgress(bookname string, names chan string) error { + return a.ListObjects("rescribeinprogress", bookname, names) +} + +func (a *awsConn) AddToQueue(url string, msg string) error { + _, err := a.sqssvc.SendMessage(&sqs.SendMessageInput{ + MessageBody: &msg, + QueueUrl: &url, + }) + return err +} + +func (a *awsConn) AddToOCRQueue(msg string) error { + return a.AddToQueue(a.ocrqurl, msg) +} + +func (a *awsConn) DelFromQueue(url string, handle string) error { + _, err := a.sqssvc.DeleteMessage(&sqs.DeleteMessageInput{ + QueueUrl: &url, + ReceiptHandle: &handle, + }) + return err +} + +func (a *awsConn) DelFromPreQueue(handle string) error { + return a.DelFromQueue(a.prequrl, handle) +} + +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) DownloadFromInProgress(key string, path string) error { + a.logger.Println("Downloading", key) + return a.Download("rescribeinprogress", key, path) +} + +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) UploadToInProgress(key string, path string) error { + a.logger.Println("Uploading", path) + return a.Upload("rescribeinprogress", key, path) +} -- 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