From a60577af86c64001773e31f1691bf4853efc4772 Mon Sep 17 00:00:00 2001 From: Nick White Date: Thu, 22 Aug 2019 10:40:57 +0100 Subject: Update usage string, and comments --- bookpipeline/aws.go | 269 ++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 269 insertions(+) create mode 100644 bookpipeline/aws.go (limited to 'bookpipeline/aws.go') diff --git a/bookpipeline/aws.go b/bookpipeline/aws.go new file mode 100644 index 0000000..1ac06de --- /dev/null +++ b/bookpipeline/aws.go @@ -0,0 +1,269 @@ +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, analysequrl 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 + + 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 + + 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) CheckOCRQueue() (Qmsg, error) { + a.logger.Println("Checking OCR queue for new messages") + return a.CheckQueue(a.ocrqurl) +} + +func (a *awsConn) CheckAnalyseQueue() (Qmsg, error) { + a.logger.Println("Checking analyse queue for new messages") + return a.CheckQueue(a.ocrqurl) +} + +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") + return a.QueueHeartbeat(t, msgHandle, a.prequrl) +} + +func (a *awsConn) OCRQueueHeartbeat(t *time.Ticker, msgHandle string) error { + a.logger.Println("Starting ocr queue heartbeat") + return a.QueueHeartbeat(t, msgHandle, a.ocrqurl) +} + +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) ListToPreprocess(bookname string) ([]string, error) { + var names []string + preprocessed := regexp.MustCompile(PreprocPattern) + objs, err := a.ListObjects("rescribeinprogress", bookname) + if err != nil { + return names, err + } + // Filter out any object that looks like it's already been preprocessed + for _, n := range objs { + if preprocessed.MatchString(n) { + a.logger.Println("Skipping item that looks like it has already been processed", n) + continue + } + names = append(names, n) + } + return names, nil +} + +func (a *awsConn) ListToOCR(bookname string) ([]string, error) { + var names []string + preprocessed := regexp.MustCompile(PreprocPattern) + objs, err := a.ListObjects("rescribeinprogress", bookname) + if err != nil { + return names, err + } + // Filter out any object that looks like it hasn't already been preprocessed + for _, n := range objs { + if ! preprocessed.MatchString(n) { + a.logger.Println("Skipping item that looks like it is not preprocessed", n) + continue + } + names = append(names, n) + } + return names, nil +} + +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) AddToAnalyseQueue(msg string) error { + return a.AddToQueue(a.analysequrl, 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) DelFromOCRQueue(handle string) error { + return a.DelFromQueue(a.ocrqurl, 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) +} + +func (a *awsConn) Logger() *log.Logger { + return a.logger +} -- cgit v1.2.1-24-ge1ad