Feat S3 Transfer Manager v2 GetObject/DownloadObject

feature/s3/transfermanager/api.go

@@ -13,4 +13,5 @@ type S3APIClient interface {
 	CreateMultipartUpload(context.Context, *s3.CreateMultipartUploadInput, ...func(*s3.Options)) (*s3.CreateMultipartUploadOutput, error)
 	CompleteMultipartUpload(context.Context, *s3.CompleteMultipartUploadInput, ...func(*s3.Options)) (*s3.CompleteMultipartUploadOutput, error)
 	AbortMultipartUpload(context.Context, *s3.AbortMultipartUploadInput, ...func(*s3.Options)) (*s3.AbortMultipartUploadOutput, error)
+	GetObject(context.Context, *s3.GetObjectInput, ...func(*s3.Options)) (*s3.GetObjectOutput, error)
 }

feature/s3/transfermanager/api_client.go

@@ -20,6 +20,8 @@ const defaultMultipartUploadThreshold = 1024 * 1024 * 16
 // using PutObject().
 const defaultTransferConcurrency = 5
 
+const defaultPartBodyMaxRetries = 3
+
 // Client provides the API client to make operations call for Amazon Simple
 // Storage Service's Transfer Manager
 // It is safe to call Client methods concurrently across goroutines.
@@ -39,6 +41,8 @@ func New(s3Client S3APIClient, opts Options, optFns ...func(*Options)) *Client {
 	resolvePartSizeBytes(&opts)
 	resolveChecksumAlgorithm(&opts)
 	resolveMultipartUploadThreshold(&opts)
+	resolveMultipartDownloadType(&opts)
+	resolvePartBodyMaxRetries(&opts)
 
 	return &Client{
 		options: opts,

feature/s3/transfermanager/api_op_DownloadObject_integ_test.go

@@ -0,0 +1,24 @@
+//go:build integration
+// +build integration
+
+package transfermanager
+
+import (
+	"bytes"
+	"strings"
+	"testing"
+)
+
+func TestInteg_DownloadObject(t *testing.T) {
+	cases := map[string]getObjectTestData{
+		"seekable body":           {Body: strings.NewReader("hello world"), ExpectBody: []byte("hello world")},
+		"empty string body":       {Body: strings.NewReader(""), ExpectBody: []byte("")},
+		"multipart download body": {Body: bytes.NewReader(largeObjectBuf), ExpectBody: largeObjectBuf},
+	}
+
+	for name, c := range cases {
+		t.Run(name, func(t *testing.T) {
+			testDownloadObject(t, setupMetadata.Buckets.Source.Name, c)
+		})
+	}
+}