github.com/go4org/go4@v0.0.0-20200104003542-c7e774b10ea0/wkfs/gcs/gcs_test.go (about)

     1  /*
     2  Copyright 2015 The Perkeep Authors
     3  
     4  Licensed under the Apache License, Version 2.0 (the "License");
     5  you may not use this file except in compliance with the License.
     6  You may obtain a copy of the License at
     7  
     8       http://www.apache.org/licenses/LICENSE-2.0
     9  
    10  Unless required by applicable law or agreed to in writing, software
    11  distributed under the License is distributed on an "AS IS" BASIS,
    12  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13  See the License for the specific language governing permissions and
    14  limitations under the License.
    15  */
    16  
    17  package gcs
    18  
    19  import (
    20  	"bytes"
    21  	"flag"
    22  	"io"
    23  	"strings"
    24  	"testing"
    25  
    26  	"cloud.google.com/go/compute/metadata"
    27  	"cloud.google.com/go/storage"
    28  	"go4.org/wkfs"
    29  	"golang.org/x/net/context"
    30  	"google.golang.org/api/iterator"
    31  )
    32  
    33  var flagBucket = flag.String("bucket", "", "Google Cloud Storage bucket where to run the tests. It should be empty.")
    34  
    35  func TestWriteRead(t *testing.T) {
    36  	if !metadata.OnGCE() {
    37  		t.Skipf("Not testing on GCE")
    38  	}
    39  	if *flagBucket == "" {
    40  		t.Skipf("No bucket specified")
    41  	}
    42  	ctx := context.Background()
    43  	cl, err := storage.NewClient(ctx)
    44  	it := cl.Bucket(*flagBucket).Objects(ctx, nil)
    45  	if _, err := it.Next(); err != iterator.Done {
    46  		if err == nil {
    47  			t.Fatalf("Bucket %v is not empty, aborting test.", *flagBucket)
    48  		}
    49  		t.Fatalf("unexpected bucket iteration error: %v", err)
    50  	}
    51  
    52  	// Write to camli-gcs_test.txt
    53  	filename := "camli-gcs_test.txt"
    54  	gcsPath := "/gcs/" + *flagBucket + "/" + filename
    55  	f, err := wkfs.Create(gcsPath)
    56  	if err != nil {
    57  		t.Fatalf("error creating %v: %v", gcsPath, err)
    58  	}
    59  	defer func() {
    60  		if err := wkfs.Remove(gcsPath); err != nil {
    61  			t.Fatalf("error while cleaning up %v: %v", gcsPath, err)
    62  		}
    63  	}()
    64  
    65  	data := "Hello World"
    66  	if _, err := io.Copy(f, strings.NewReader(data)); err != nil {
    67  		t.Fatalf("error writing to %v: %v", gcsPath, err)
    68  	}
    69  	if err := f.Close(); err != nil {
    70  		t.Fatalf("error closing %v: %v", gcsPath, err)
    71  	}
    72  
    73  	// Read back from camli-gcs_test.txt
    74  	g, err := wkfs.Open(gcsPath)
    75  	if err != nil {
    76  		t.Fatalf("error opening %v: %v", gcsPath, err)
    77  	}
    78  	defer g.Close()
    79  	var buf bytes.Buffer
    80  	if _, err := io.Copy(&buf, g); err != nil {
    81  		t.Fatalf("error reading %v: %v", gcsPath, err)
    82  	}
    83  	if buf.String() != data {
    84  		t.Fatalf("error with %v contents: got %v, wanted %v", gcsPath, buf.String(), data)
    85  	}
    86  }