From ca1ee4ccb33784103339b4b52f8948aa0dd30263 Mon Sep 17 00:00:00 2001
From: Nick White <git@njw.name>
Date: Wed, 11 Dec 2019 09:31:18 +0000
Subject: Use aws.go with mkpipeline too, plus fix one log.Fatal call in aws.go
 which should have been handled by caller

---
 aws.go | 64 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 59 insertions(+), 5 deletions(-)

(limited to 'aws.go')

diff --git a/aws.go b/aws.go
index c2aa35e..08a597e 100644
--- a/aws.go
+++ b/aws.go
@@ -48,8 +48,8 @@ type AwsConn struct {
 	wipstorageid                            string
 }
 
-// TODO: split this up, as not everything is needed for different uses
-func (a *AwsConn) Init() error {
+// MinimalInit does the bare minimum to initialise aws services
+func (a *AwsConn) MinimalInit() error {
 	if a.Region == "" {
 		return errors.New("No Region set")
 	}
@@ -70,6 +70,19 @@ func (a *AwsConn) Init() error {
 	a.downloader = s3manager.NewDownloader(a.sess)
 	a.uploader = s3manager.NewUploader(a.sess)
 
+	a.wipstorageid = "rescribeinprogress"
+
+	return nil
+}
+
+// Init initialises aws services, also finding the urls needed to
+// address SQS queues directly.
+func (a *AwsConn) Init() error {
+	err := a.MinimalInit()
+	if err != nil {
+		return err
+	}
+
 	a.Logger.Println("Getting preprocess queue URL")
 	result, err := a.sqssvc.GetQueueUrl(&sqs.GetQueueUrlInput{
 		QueueName: aws.String("rescribepreprocess"),
@@ -115,8 +128,6 @@ func (a *AwsConn) Init() error {
 	}
 	a.ocrpgqurl = *result.QueueUrl
 
-	a.wipstorageid = "rescribeinprogress"
-
 	return nil
 }
 
@@ -289,6 +300,49 @@ func (a *AwsConn) ListObjectPrefixes(bucket string) ([]string, error) {
 	return prefixes, err
 }
 
+// CreateBucket creates a new S3 bucket
+func (a *AwsConn) CreateBucket(name string) error {
+	_, err := a.s3svc.CreateBucket(&s3.CreateBucketInput{
+		Bucket: aws.String(name),
+	})
+	if err != nil {
+		aerr, ok := err.(awserr.Error)
+		if ok && (aerr.Code() == s3.ErrCodeBucketAlreadyExists || aerr.Code() == s3.ErrCodeBucketAlreadyOwnedByYou) {
+			a.Logger.Println("Bucket already exists:", name)
+		} else {
+			return errors.New(fmt.Sprintf("Error creating bucket %s: %v", name, err))
+		}
+	}
+	return nil
+}
+
+// CreateQueue creates a new SQS queue
+// Note the queue attributes are currently hardcoded; it may make sense
+// to specify them as arguments in the future.
+func (a *AwsConn) CreateQueue(name string) error {
+	_, err := a.sqssvc.CreateQueue(&sqs.CreateQueueInput{
+		QueueName: aws.String(name),
+		Attributes: map[string]*string{
+		        "VisibilityTimeout":             aws.String("120"),     // 2 minutes
+		        "MessageRetentionPeriod":        aws.String("1209600"), // 14 days; max allowed by sqs
+		        "ReceiveMessageWaitTimeSeconds": aws.String("20"),
+		},
+	})
+	if err != nil {
+		aerr, ok := err.(awserr.Error)
+		// Note the QueueAlreadyExists code is only emitted if an existing queue
+		// has different attributes than the one that was being created. SQS just
+		// quietly ignores the CreateQueue request if it is identical to an
+		// existing queue.
+		if ok && aerr.Code() == sqs.ErrCodeQueueNameExists {
+		        return errors.New("Error: Queue already exists but has different attributes:" + name)
+		} else {
+			return errors.New(fmt.Sprintf("Error creating queue %s: %v", name, err))
+		}
+	}
+	return nil
+}
+
 func (a *AwsConn) AddToQueue(url string, msg string) error {
 	_, err := a.sqssvc.SendMessage(&sqs.SendMessageInput{
 		MessageBody: &msg,
@@ -326,7 +380,7 @@ func (a *AwsConn) Download(bucket string, key string, path string) error {
 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)
+		return err
 	}
 	defer file.Close()
 
-- 
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