Add S3 upload mode (#25)

README.md

@@ -207,6 +207,8 @@ Flags:
   --bucket=BUCKET                Bucket name.
   --key=KEY                      Entry key.
   --path-style                   To use path-style addressing, i.e., `http://s3.amazonaws.com/BUCKET/KEY`.
+  --save=SAVE                    Path to local file to save the entry.
+  --upload=UPLOAD                Path to local file to upload to S3, enables upload load testing.
 ```
 
 ```

s3/_testdata/docker-compose.yml

@@ -0,0 +1,17 @@
+# Start minio server with docker-compose up and run
+#  plt s3 --bucket=default --key=foo --number=100 --url=http://localhost:9000 --access-key=minio --secret-key=minio123 --path-style --upload=docker-compose.yml
+#  plt s3 --bucket=default --key=foo --number=100 --url=http://localhost:9000 --access-key=minio --secret-key=minio123 --path-style
+# to test plt against local S3.
+
+services:
+  s3:
+    image: minio/minio:latest
+    environment:
+      SERVICES: s3
+      MINIO_ACCESS_KEY: minio
+      MINIO_SECRET_KEY: minio123
+    ports:
+      - '9000:9000'
+    entrypoint: sh
+    # Creating "default" bucket and starting server.
+    command: -c 'mkdir -p /data/default && minio server /data'

s3/cmd.go

@@ -17,7 +17,8 @@ type Flags struct {
 	Key          string
 	PathStyle    bool
 
-	Save string
+	Save   string
+	Upload string
 }
 
 // AddCommand registers curl command into CLI app.
@@ -40,6 +41,7 @@ func AddCommand(lf *loadgen.Flags) {
 		BoolVar(&f.PathStyle)
 
 	s3.Flag("save", "Path to local file to save the entry.").StringVar(&f.Save)
+	s3.Flag("upload", "Path to local file to upload to S3, enables upload load testing.").StringVar(&f.Upload)
 
 	s3.Action(func(kp *kingpin.ParseContext) error {
 		return run(*lf, f)

s3/job.go

@@ -48,18 +48,19 @@ func newJobProducer(f Flags) (*jobProducer, error) {
 		return nil, err
 	}
 
-	dl := s3manager.NewDownloader(sess)
-
 	return &jobProducer{
-		f:     f,
-		dl:    dl,
+		f:  f,
+		dl: s3manager.NewDownloader(sess),
+		ul: s3manager.NewUploader(sess),
+
 		start: time.Now(),
 	}, nil
 }
 
 type jobProducer struct {
 	f  Flags
 	dl *s3manager.Downloader
+	ul *s3manager.Uploader
 
 	totBytes int64
 	tot      int64
@@ -73,13 +74,33 @@ func (nopWriterAt) WriteAt(p []byte, off int64) (n int, err error) {
 }
 
 func (j *jobProducer) Job(i int) (time.Duration, error) {
-	start := time.Now()
+	var (
+		start = time.Now()
+		err   error
+	)
+
+	if j.f.Upload != "" {
+		err = j.upload(i)
+	} else {
+		err = j.download(i)
+	}
+
+	if err != nil {
+		return 0, err
+	}
+
+	atomic.AddInt64(&j.tot, 1)
+
+	return time.Since(start), nil
+}
+
+func (j *jobProducer) download(i int) error {
 	w := io.WriterAt(nopWriterAt{})
 
 	if i == 0 && j.f.Save != "" {
 		f, err := os.Create(j.f.Save)
 		if err != nil {
-			return 0, fmt.Errorf("failed to create file to save S3 result: %w", err)
+			return fmt.Errorf("failed to create file to save S3 result: %w", err)
 		}
 
 		w = f
@@ -96,13 +117,36 @@ func (j *jobProducer) Job(i int) (time.Duration, error) {
 		Key:    aws.String(j.f.Key),
 	})
 	if err != nil {
-		return 0, fmt.Errorf("failed to download file: %w", err)
+		return fmt.Errorf("failed to download file: %w", err)
 	}
 
 	atomic.AddInt64(&j.totBytes, n)
-	atomic.AddInt64(&j.tot, 1)
 
-	return time.Since(start), nil
+	return nil
+}
+
+func (j *jobProducer) upload(_ int) error {
+	f, err := os.Open(j.f.Upload)
+	if err != nil {
+		return fmt.Errorf("failed to open file to upload: %w", err)
+	}
+
+	defer func() {
+		if err := f.Close(); err != nil {
+			println("failed to close file:", err)
+		}
+	}()
+
+	_, err = j.ul.Upload(&s3manager.UploadInput{
+		Bucket: aws.String(j.f.Bucket),
+		Key:    aws.String(j.f.Key),
+		Body:   f,
+	})
+	if err != nil {
+		return fmt.Errorf("failed to upload file to S3: %w", err)
+	}
+
+	return nil
 }
 
 func (j *jobProducer) RequestCounts() map[string]int {
@@ -111,6 +155,10 @@ func (j *jobProducer) RequestCounts() map[string]int {
 
 // Print prints additional stats.
 func (j *jobProducer) String() string {
+	if j.totBytes == 0 {
+		return ""
+	}
+
 	elapsed := time.Since(j.start).Seconds()
 
 	return fmt.Sprintf("\nRead: total %.2f MB, avg %.2f MB, %.2f MB/s\n",