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// Copyright 2019 The Go Cloud Development Kit Authors
//
// 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
//
// https://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 blob_test
import (
"context"
"testing"
"github.com/google/go-cmp/cmp"
"go.opencensus.io/stats/view"
"go.opencensus.io/tag"
"gocloud.dev/blob"
"gocloud.dev/blob/memblob"
"gocloud.dev/gcerrors"
"gocloud.dev/internal/oc"
"gocloud.dev/internal/testing/octest"
)
func TestOpenCensus(t *testing.T) {
ctx := context.Background()
te := octest.NewTestExporter(blob.OpenCensusViews)
defer te.Unregister()
bytes := []byte("foo")
b := memblob.OpenBucket(nil)
defer b.Close()
if err := b.WriteAll(ctx, "key", bytes, nil); err != nil {
t.Fatal(err)
}
if _, err := b.ReadAll(ctx, "key"); err != nil {
t.Fatal(err)
}
if _, err := b.Attributes(ctx, "key"); err != nil {
t.Fatal(err)
}
if _, _, err := b.ListPage(ctx, blob.FirstPageToken, 3, nil); err != nil {
t.Fatal(err)
}
if err := b.Delete(ctx, "key"); err != nil {
t.Fatal(err)
}
if _, err := b.ReadAll(ctx, "noSuchKey"); err == nil {
t.Fatal("got nil, want error")
}
const driver = "gocloud.dev/blob/memblob"
diff := octest.Diff(te.Spans(), te.Counts(), "gocloud.dev/blob", driver, []octest.Call{
{Method: "NewWriter", Code: gcerrors.OK},
{Method: "NewRangeReader", Code: gcerrors.OK},
{Method: "Attributes", Code: gcerrors.OK},
{Method: "ListPage", Code: gcerrors.OK},
{Method: "Delete", Code: gcerrors.OK},
{Method: "NewRangeReader", Code: gcerrors.NotFound},
})
if diff != "" {
t.Error(diff)
}
// Find and verify the bytes read/written metrics.
var sawRead, sawWritten bool
tags := []tag.Tag{{Key: oc.ProviderKey, Value: driver}}
for !sawRead || !sawWritten {
data := <-te.Stats
switch data.View.Name {
case "gocloud.dev/blob/bytes_read":
if sawRead {
continue
}
sawRead = true
case "gocloud.dev/blob/bytes_written":
if sawWritten {
continue
}
sawWritten = true
default:
continue
}
if diff := cmp.Diff(data.Rows[0].Tags, tags, cmp.AllowUnexported(tag.Key{})); diff != "" {
t.Errorf("tags for %s: %s", data.View.Name, diff)
continue
}
sd, ok := data.Rows[0].Data.(*view.SumData)
if !ok {
t.Errorf("%s: data is %T, want SumData", data.View.Name, data.Rows[0].Data)
continue
}
if got := int(sd.Value); got < len(bytes) {
t.Errorf("%s: got %d, want at least %d", data.View.Name, got, len(bytes))
}
}
}
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