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authorNick White <git@njw.name>2019-08-22 10:40:57 +0100
committerNick White <git@njw.name>2019-08-22 10:40:57 +0100
commita60577af86c64001773e31f1691bf4853efc4772 (patch)
tree90a3eebf371c6faa3551020c9cf85eb6f6a03c0a /bookpipeline/aws.go
parent24763c95d26535b093476b1c6b21dcbceb1ff55c (diff)
Update usage string, and comments
Diffstat (limited to 'bookpipeline/aws.go')
-rw-r--r--bookpipeline/aws.go269
1 files changed, 269 insertions, 0 deletions
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
+}