/* * Minio Cloud Storage, (C) 2015-2016, 2017 Minio, Inc. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package cmd import ( "bytes" "context" "crypto/md5" "encoding/hex" "fmt" "io/ioutil" "os" "strconv" "strings" "testing" ) // Wrapper for calling ListObjects tests for both XL multiple disks and single node setup. func TestListObjects(t *testing.T) { ExecObjectLayerTest(t, testListObjects) } // Unit test for ListObjects in general. func testListObjects(obj ObjectLayer, instanceType string, t TestErrHandler) { testBuckets := []string{ // This bucket is used for testing ListObject operations. "test-bucket-list-object", // Will not store any objects in this bucket, // Its to test ListObjects on an empty bucket. "empty-bucket", } for _, bucket := range testBuckets { err := obj.MakeBucketWithLocation(context.Background(), bucket, "") if err != nil { t.Fatalf("%s : %s", instanceType, err.Error()) } } var err error testObjects := []struct { name string content string meta map[string]string }{ {"Asia-maps.png", "asis-maps", map[string]string{"content-type": "image/png"}}, {"Asia/India/India-summer-photos-1", "contentstring", nil}, {"Asia/India/Karnataka/Bangalore/Koramangala/pics", "contentstring", nil}, {"newPrefix0", "newPrefix0", nil}, {"newPrefix1", "newPrefix1", nil}, {"newzen/zen/recurse/again/again/again/pics", "recurse", nil}, {"obj0", "obj0", nil}, {"obj1", "obj1", nil}, {"obj2", "obj2", nil}, {"z-empty-dir/", "", nil}, } for _, object := range testObjects { md5Bytes := md5.Sum([]byte(object.content)) _, err = obj.PutObject(context.Background(), testBuckets[0], object.name, mustGetHashReader(t, bytes.NewBufferString(object.content), int64(len(object.content)), hex.EncodeToString(md5Bytes[:]), ""), object.meta) if err != nil { t.Fatalf("%s : %s", instanceType, err.Error()) } } // Formualting the result data set to be expected from ListObjects call inside the tests, // This will be used in testCases and used for asserting the correctness of ListObjects output in the tests. resultCases := []ListObjectsInfo{ // ListObjectsResult-0. // Testing for listing all objects in the bucket, (testCase 20,21,22). { IsTruncated: false, Objects: []ObjectInfo{ {Name: "Asia-maps.png"}, {Name: "Asia/India/India-summer-photos-1"}, {Name: "Asia/India/Karnataka/Bangalore/Koramangala/pics"}, {Name: "newPrefix0"}, {Name: "newPrefix1"}, {Name: "newzen/zen/recurse/again/again/again/pics"}, {Name: "obj0"}, {Name: "obj1"}, {Name: "obj2"}, {Name: "z-empty-dir/"}, }, }, // ListObjectsResult-1. // Used for asserting the truncated case, (testCase 23). { IsTruncated: true, Objects: []ObjectInfo{ {Name: "Asia-maps.png"}, {Name: "Asia/India/India-summer-photos-1"}, {Name: "Asia/India/Karnataka/Bangalore/Koramangala/pics"}, {Name: "newPrefix0"}, {Name: "newPrefix1"}, }, }, // ListObjectsResult-2. // (TestCase 24). { IsTruncated: true, Objects: []ObjectInfo{ {Name: "Asia-maps.png"}, {Name: "Asia/India/India-summer-photos-1"}, {Name: "Asia/India/Karnataka/Bangalore/Koramangala/pics"}, {Name: "newPrefix0"}, }, }, // ListObjectsResult-3. // (TestCase 25). { IsTruncated: true, Objects: []ObjectInfo{ {Name: "Asia-maps.png"}, {Name: "Asia/India/India-summer-photos-1"}, {Name: "Asia/India/Karnataka/Bangalore/Koramangala/pics"}, }, }, // ListObjectsResult-4. // Again used for truncated case. // (TestCase 26). { IsTruncated: true, Objects: []ObjectInfo{ {Name: "Asia-maps.png"}, }, }, // ListObjectsResult-5. // Used for Asserting prefixes. // Used for test case with prefix "new", (testCase 27-29). { IsTruncated: false, Objects: []ObjectInfo{ {Name: "newPrefix0"}, {Name: "newPrefix1"}, {Name: "newzen/zen/recurse/again/again/again/pics"}, }, }, // ListObjectsResult-6. // Used for Asserting prefixes. // Used for test case with prefix = "obj", (testCase 30). { IsTruncated: false, Objects: []ObjectInfo{ {Name: "obj0"}, {Name: "obj1"}, {Name: "obj2"}, }, }, // ListObjectsResult-7. // Used for Asserting prefixes and truncation. // Used for test case with prefix = "new" and maxKeys = 1, (testCase 31). { IsTruncated: true, Objects: []ObjectInfo{ {Name: "newPrefix0"}, }, }, // ListObjectsResult-8. // Used for Asserting prefixes. // Used for test case with prefix = "obj" and maxKeys = 2, (testCase 32). { IsTruncated: true, Objects: []ObjectInfo{ {Name: "obj0"}, {Name: "obj1"}, }, }, // ListObjectsResult-9. // Used for asserting the case with marker, but without prefix. //marker is set to "newPrefix0" in the testCase, (testCase 33). { IsTruncated: false, Objects: []ObjectInfo{ {Name: "newPrefix1"}, {Name: "newzen/zen/recurse/again/again/again/pics"}, {Name: "obj0"}, {Name: "obj1"}, {Name: "obj2"}, {Name: "z-empty-dir/"}, }, }, // ListObjectsResult-10. //marker is set to "newPrefix1" in the testCase, (testCase 34). { IsTruncated: false, Objects: []ObjectInfo{ {Name: "newzen/zen/recurse/again/again/again/pics"}, {Name: "obj0"}, {Name: "obj1"}, {Name: "obj2"}, {Name: "z-empty-dir/"}, }, }, // ListObjectsResult-11. //marker is set to "obj0" in the testCase, (testCase 35). { IsTruncated: false, Objects: []ObjectInfo{ {Name: "obj1"}, {Name: "obj2"}, {Name: "z-empty-dir/"}, }, }, // ListObjectsResult-12. // Marker is set to "obj1" in the testCase, (testCase 36). { IsTruncated: false, Objects: []ObjectInfo{ {Name: "obj2"}, {Name: "z-empty-dir/"}, }, }, // ListObjectsResult-13. // Marker is set to "man" in the testCase, (testCase37). { IsTruncated: false, Objects: []ObjectInfo{ {Name: "newPrefix0"}, {Name: "newPrefix1"}, {Name: "newzen/zen/recurse/again/again/again/pics"}, {Name: "obj0"}, {Name: "obj1"}, {Name: "obj2"}, {Name: "z-empty-dir/"}, }, }, // ListObjectsResult-14. // Marker is set to "Abc" in the testCase, (testCase 39). { IsTruncated: false, Objects: []ObjectInfo{ {Name: "Asia-maps.png"}, {Name: "Asia/India/India-summer-photos-1"}, {Name: "Asia/India/Karnataka/Bangalore/Koramangala/pics"}, {Name: "newPrefix0"}, {Name: "newPrefix1"}, {Name: "newzen/zen/recurse/again/again/again/pics"}, {Name: "obj0"}, {Name: "obj1"}, {Name: "obj2"}, {Name: "z-empty-dir/"}, }, }, // ListObjectsResult-15. // Marker is set to "Asia/India/India-summer-photos-1" in the testCase, (testCase 40). { IsTruncated: false, Objects: []ObjectInfo{ {Name: "Asia/India/Karnataka/Bangalore/Koramangala/pics"}, {Name: "newPrefix0"}, {Name: "newPrefix1"}, {Name: "newzen/zen/recurse/again/again/again/pics"}, {Name: "obj0"}, {Name: "obj1"}, {Name: "obj2"}, {Name: "z-empty-dir/"}, }, }, // ListObjectsResult-16. // Marker is set to "Asia/India/Karnataka/Bangalore/Koramangala/pics" in the testCase, (testCase 41). { IsTruncated: false, Objects: []ObjectInfo{ {Name: "newPrefix0"}, {Name: "newPrefix1"}, {Name: "newzen/zen/recurse/again/again/again/pics"}, {Name: "obj0"}, {Name: "obj1"}, {Name: "obj2"}, {Name: "z-empty-dir/"}, }, }, // ListObjectsResult-17. // Used for asserting the case with marker, without prefix but with truncation. // Marker = "newPrefix0" & maxKeys = 3 in the testCase, (testCase42). // Output truncated to 3 values. { IsTruncated: true, Objects: []ObjectInfo{ {Name: "newPrefix1"}, {Name: "newzen/zen/recurse/again/again/again/pics"}, {Name: "obj0"}, }, }, // ListObjectsResult-18. // Marker = "newPrefix1" & maxkeys = 1 in the testCase, (testCase43). // Output truncated to 1 value. { IsTruncated: true, Objects: []ObjectInfo{ {Name: "newzen/zen/recurse/again/again/again/pics"}, }, }, // ListObjectsResult-19. // Marker = "obj0" & maxKeys = 1 in the testCase, (testCase44). // Output truncated to 1 value. { IsTruncated: true, Objects: []ObjectInfo{ {Name: "obj1"}, }, }, // ListObjectsResult-20. // Marker = "obj0" & prefix = "obj" in the testCase, (testCase 45). { IsTruncated: false, Objects: []ObjectInfo{ {Name: "obj1"}, {Name: "obj2"}, }, }, // ListObjectsResult-21. // Marker = "obj1" & prefix = "obj" in the testCase, (testCase 46). { IsTruncated: false, Objects: []ObjectInfo{ {Name: "obj2"}, }, }, // ListObjectsResult-22. // Marker = "newPrefix0" & prefix = "new" in the testCase,, (testCase 47). { IsTruncated: false, Objects: []ObjectInfo{ {Name: "newPrefix1"}, {Name: "newzen/zen/recurse/again/again/again/pics"}, }, }, // ListObjectsResult-23. // Prefix is set to "Asia/India/" in the testCase, and delimiter is not set (testCase 55). { IsTruncated: false, Objects: []ObjectInfo{ {Name: "Asia/India/India-summer-photos-1"}, {Name: "Asia/India/Karnataka/Bangalore/Koramangala/pics"}, }, }, // ListObjectsResult-24. // Prefix is set to "Asia" in the testCase, and delimiter is not set (testCase 56). { IsTruncated: false, Objects: []ObjectInfo{ {Name: "Asia-maps.png"}, {Name: "Asia/India/India-summer-photos-1"}, {Name: "Asia/India/Karnataka/Bangalore/Koramangala/pics"}, }, }, // ListObjectsResult-25. // Prefix is set to "Asia" in the testCase, and delimiter is set (testCase 57). { IsTruncated: false, Objects: []ObjectInfo{ {Name: "Asia-maps.png"}, }, }, // ListObjectsResult-26. // prefix = "new" and delimiter is set in the testCase.(testCase 58). { IsTruncated: false, Objects: []ObjectInfo{ {Name: "newPrefix0"}, {Name: "newPrefix1"}, }, }, // ListObjectsResult-27. // Prefix is set to "Asia/India/" in the testCase, and delimiter is set to forward slash '/' (testCase 59). { IsTruncated: false, Objects: []ObjectInfo{ {Name: "Asia/India/India-summer-photos-1"}, }, }, // ListObjectsResult-28. // Marker is set to "Asia/India/India-summer-photos-1" and delimiter set in the testCase, (testCase 60). { IsTruncated: false, Objects: []ObjectInfo{ {Name: "newPrefix0"}, {Name: "newPrefix1"}, {Name: "obj0"}, {Name: "obj1"}, {Name: "obj2"}, }, }, // ListObjectsResult-29. // Marker is set to "Asia/India/Karnataka/Bangalore/Koramangala/pics" in the testCase and delimeter set, (testCase 61). { IsTruncated: false, Objects: []ObjectInfo{ {Name: "newPrefix0"}, {Name: "newPrefix1"}, {Name: "obj0"}, {Name: "obj1"}, {Name: "obj2"}, }, }, // ListObjectsResult-30. // Prefix and Delimiter is set to '/', (testCase 62). { IsTruncated: false, Objects: []ObjectInfo{}, }, } testCases := []struct { // Inputs to ListObjects. bucketName string prefix string marker string delimeter string maxKeys int32 // Expected output of ListObjects. result ListObjectsInfo err error // Flag indicating whether the test is expected to pass or not. shouldPass bool }{ // Test cases with invalid bucket names ( Test number 1-4 ). {".test", "", "", "", 0, ListObjectsInfo{}, BucketNotFound{Bucket: ".test"}, false}, {"Test", "", "", "", 0, ListObjectsInfo{}, BucketNotFound{Bucket: "Test"}, false}, {"---", "", "", "", 0, ListObjectsInfo{}, BucketNotFound{Bucket: "---"}, false}, {"ad", "", "", "", 0, ListObjectsInfo{}, BucketNotFound{Bucket: "ad"}, false}, // Using an existing file for bucket name, but its not a directory (5). {"simple-file.txt", "", "", "", 0, ListObjectsInfo{}, BucketNotFound{Bucket: "simple-file.txt"}, false}, // Valid bucket names, but they donot exist (6-8). {"volatile-bucket-1", "", "", "", 0, ListObjectsInfo{}, BucketNotFound{Bucket: "volatile-bucket-1"}, false}, {"volatile-bucket-2", "", "", "", 0, ListObjectsInfo{}, BucketNotFound{Bucket: "volatile-bucket-2"}, false}, {"volatile-bucket-3", "", "", "", 0, ListObjectsInfo{}, BucketNotFound{Bucket: "volatile-bucket-3"}, false}, // Valid, existing bucket, but sending invalid delimeter values (9-10). // Empty string < "" > and forward slash < / > are the ony two valid arguments for delimeter. {"test-bucket-list-object", "", "", "*", 0, ListObjectsInfo{}, fmt.Errorf("delimiter '%s' is not supported", "*"), false}, {"test-bucket-list-object", "", "", "-", 0, ListObjectsInfo{}, fmt.Errorf("delimiter '%s' is not supported", "-"), false}, // Testing for failure cases with both perfix and marker (11). // The prefix and marker combination to be valid it should satisfy strings.HasPrefix(marker, prefix). {"test-bucket-list-object", "asia", "europe-object", "", 0, ListObjectsInfo{}, fmt.Errorf("Invalid combination of marker '%s' and prefix '%s'", "europe-object", "asia"), false}, // Setting a non-existing directory to be prefix (12-13). {"empty-bucket", "europe/france/", "", "", 1, ListObjectsInfo{}, nil, true}, {"empty-bucket", "africa/tunisia/", "", "", 1, ListObjectsInfo{}, nil, true}, // Testing on empty bucket, that is, bucket without any objects in it (14). {"empty-bucket", "", "", "", 0, ListObjectsInfo{}, nil, true}, // Setting maxKeys to negative value (15-16). {"empty-bucket", "", "", "", -1, ListObjectsInfo{}, nil, true}, {"empty-bucket", "", "", "", 1, ListObjectsInfo{}, nil, true}, // Setting maxKeys to a very large value (17). {"empty-bucket", "", "", "", 111100000, ListObjectsInfo{}, nil, true}, // Testing for all 10 objects in the bucket (18). {"test-bucket-list-object", "", "", "", 10, resultCases[0], nil, true}, //Testing for negative value of maxKey, this should set maxKeys to listObjectsLimit (19). {"test-bucket-list-object", "", "", "", -1, resultCases[0], nil, true}, // Testing for very large value of maxKey, this should set maxKeys to listObjectsLimit (20). {"test-bucket-list-object", "", "", "", 1234567890, resultCases[0], nil, true}, // Testing for trancated value (21-24). {"test-bucket-list-object", "", "", "", 5, resultCases[1], nil, true}, {"test-bucket-list-object", "", "", "", 4, resultCases[2], nil, true}, {"test-bucket-list-object", "", "", "", 3, resultCases[3], nil, true}, {"test-bucket-list-object", "", "", "", 1, resultCases[4], nil, true}, // Testing with prefix (25-28). {"test-bucket-list-object", "new", "", "", 3, resultCases[5], nil, true}, {"test-bucket-list-object", "new", "", "", 4, resultCases[5], nil, true}, {"test-bucket-list-object", "new", "", "", 5, resultCases[5], nil, true}, {"test-bucket-list-object", "obj", "", "", 3, resultCases[6], nil, true}, // Testing with prefix and truncation (29-30). {"test-bucket-list-object", "new", "", "", 1, resultCases[7], nil, true}, {"test-bucket-list-object", "obj", "", "", 2, resultCases[8], nil, true}, // Testing with marker, but without prefix and truncation (31-35). {"test-bucket-list-object", "", "newPrefix0", "", 6, resultCases[9], nil, true}, {"test-bucket-list-object", "", "newPrefix1", "", 5, resultCases[10], nil, true}, {"test-bucket-list-object", "", "obj0", "", 4, resultCases[11], nil, true}, {"test-bucket-list-object", "", "obj1", "", 2, resultCases[12], nil, true}, {"test-bucket-list-object", "", "man", "", 11, resultCases[13], nil, true}, // Marker being set to a value which is greater than and all object names when sorted (36). // Expected to send an empty response in this case. {"test-bucket-list-object", "", "zen", "", 10, ListObjectsInfo{}, nil, true}, // Marker being set to a value which is lesser than and all object names when sorted (37). // Expected to send all the objects in the bucket in this case. {"test-bucket-list-object", "", "Abc", "", 10, resultCases[14], nil, true}, // Marker is to a hierarhical value (38-39). {"test-bucket-list-object", "", "Asia/India/India-summer-photos-1", "", 10, resultCases[15], nil, true}, {"test-bucket-list-object", "", "Asia/India/Karnataka/Bangalore/Koramangala/pics", "", 10, resultCases[16], nil, true}, // Testing with marker and truncation, but no prefix (40-42). {"test-bucket-list-object", "", "newPrefix0", "", 3, resultCases[17], nil, true}, {"test-bucket-list-object", "", "newPrefix1", "", 1, resultCases[18], nil, true}, {"test-bucket-list-object", "", "obj0", "", 1, resultCases[19], nil, true}, // Testing with both marker and prefix, but without truncation (43-45). // The valid combination of marker and prefix should satisfy strings.HasPrefix(marker, prefix). {"test-bucket-list-object", "obj", "obj0", "", 2, resultCases[20], nil, true}, {"test-bucket-list-object", "obj", "obj1", "", 1, resultCases[21], nil, true}, {"test-bucket-list-object", "new", "newPrefix0", "", 2, resultCases[22], nil, true}, // Testing with maxKeys set to 0 (46-52). // The parameters have to valid. {"test-bucket-list-object", "", "obj1", "", 0, ListObjectsInfo{}, nil, true}, {"test-bucket-list-object", "", "obj0", "", 0, ListObjectsInfo{}, nil, true}, {"test-bucket-list-object", "new", "", "", 0, ListObjectsInfo{}, nil, true}, {"test-bucket-list-object", "obj", "", "", 0, ListObjectsInfo{}, nil, true}, {"test-bucket-list-object", "obj", "obj0", "", 0, ListObjectsInfo{}, nil, true}, {"test-bucket-list-object", "obj", "obj1", "", 0, ListObjectsInfo{}, nil, true}, {"test-bucket-list-object", "new", "newPrefix0", "", 0, ListObjectsInfo{}, nil, true}, // Tests on hierarchical key names as prefix. // Without delimteter the code should recurse into the prefix Dir. // Tests with prefix, but without delimiter (53-54). {"test-bucket-list-object", "Asia/India/", "", "", 10, resultCases[23], nil, true}, {"test-bucket-list-object", "Asia", "", "", 10, resultCases[24], nil, true}, // Tests with prefix and delimiter (55-57). // With delimeter the code should not recurse into the sub-directories of prefix Dir. {"test-bucket-list-object", "Asia", "", "/", 10, resultCases[25], nil, true}, {"test-bucket-list-object", "new", "", "/", 10, resultCases[26], nil, true}, {"test-bucket-list-object", "Asia/India/", "", "/", 10, resultCases[27], nil, true}, // Test with marker set as hierarhical value and with delimiter. (58-59) {"test-bucket-list-object", "", "Asia/India/India-summer-photos-1", "/", 10, resultCases[28], nil, true}, {"test-bucket-list-object", "", "Asia/India/Karnataka/Bangalore/Koramangala/pics", "/", 10, resultCases[29], nil, true}, // Test with prefix and delimiter set to '/'. (60) {"test-bucket-list-object", "/", "", "/", 10, resultCases[30], nil, true}, // Test with invalid prefix (61) {"test-bucket-list-object", "\\", "", "/", 10, resultCases[30], ObjectNameInvalid{Bucket: "test-bucket-list-object", Object: "\\"}, false}, } for i, testCase := range testCases { result, err := obj.ListObjects(context.Background(), testCase.bucketName, testCase.prefix, testCase.marker, testCase.delimeter, int(testCase.maxKeys)) if err != nil && testCase.shouldPass { t.Errorf("Test %d: %s: Expected to pass, but failed with: %s", i+1, instanceType, err.Error()) } if err == nil && !testCase.shouldPass { t.Errorf("Test %d: %s: Expected to fail with \"%s\", but passed instead", i+1, instanceType, testCase.err.Error()) } // Failed as expected, but does it fail for the expected reason. if err != nil && !testCase.shouldPass { if !strings.Contains(err.Error(), testCase.err.Error()) { t.Errorf("Test %d: %s: Expected to fail with error \"%s\", but instead failed with error \"%s\" instead", i+1, instanceType, testCase.err.Error(), err.Error()) } } // Since there are cases for which ListObjects fails, this is // necessary. Test passes as expected, but the output values // are verified for correctness here. if err == nil && testCase.shouldPass { // The length of the expected ListObjectsResult.Objects // should match in both expected result from test cases // and in the output. On failure calling t.Fatalf, // otherwise it may lead to index out of range error in // assertion following this. if len(testCase.result.Objects) != len(result.Objects) { t.Fatalf("Test %d: %s: Expected number of object in the result to be '%d', but found '%d' objects instead", i+1, instanceType, len(testCase.result.Objects), len(result.Objects)) } for j := 0; j < len(testCase.result.Objects); j++ { if testCase.result.Objects[j].Name != result.Objects[j].Name { t.Errorf("Test %d: %s: Expected object name to be \"%s\", but found \"%s\" instead", i+1, instanceType, testCase.result.Objects[j].Name, result.Objects[j].Name) } //FIXME: we should always check for ETag if result.Objects[j].ETag == "" && !strings.HasSuffix(result.Objects[j].Name, slashSeparator) { t.Errorf("Test %d: %s: Expected ETag to be not empty, but found empty instead (%v)", i+1, instanceType, result.Objects[j].Name) } } if testCase.result.IsTruncated != result.IsTruncated { t.Errorf("Test %d: %s: Expected IsTruncated flag to be %v, but instead found it to be %v", i+1, instanceType, testCase.result.IsTruncated, result.IsTruncated) } } // Take ListObject treeWalk go-routine to completion, if available in the treewalk pool. if result.IsTruncated { _, err = obj.ListObjects(context.Background(), testCase.bucketName, testCase.prefix, result.NextMarker, testCase.delimeter, 1000) if err != nil { t.Fatal(err) } } } } // Initialize FS backend for the benchmark. func initFSObjectsB(disk string, t *testing.B) (obj ObjectLayer) { var err error obj, err = NewFSObjectLayer(disk) if err != nil { t.Fatal("Unexpected err: ", err) } return obj } // BenchmarkListObjects - Run ListObject Repeatedly and benchmark. func BenchmarkListObjects(b *testing.B) { // Make a temporary directory to use as the obj. directory, err := ioutil.TempDir(globalTestTmpDir, "minio-list-benchmark") if err != nil { b.Fatal(err) } defer os.RemoveAll(directory) // Create the obj. obj := initFSObjectsB(directory, b) bucket := "ls-benchmark-bucket" // Create a bucket. err = obj.MakeBucketWithLocation(context.Background(), bucket, "") if err != nil { b.Fatal(err) } // Insert objects to be listed and benchmarked later. for i := 0; i < 20000; i++ { key := "obj" + strconv.Itoa(i) _, err = obj.PutObject(context.Background(), bucket, key, mustGetHashReader(b, bytes.NewBufferString(key), int64(len(key)), "", ""), nil) if err != nil { b.Fatal(err) } } b.ResetTimer() // List the buckets over and over and over. for i := 0; i < b.N; i++ { _, err = obj.ListObjects(context.Background(), bucket, "", "obj9000", "", -1) if err != nil { b.Fatal(err) } } }