func ExampleListObjects() {
ctx := Example_auth()
var query *storage.Query
for {
// If you are using this package on App Engine Managed VMs runtime,
// you can init a bucket client with your app's default bucket name.
// See http://godoc.org/google.golang.org/appengine/file#DefaultBucketName.
objects, err := storage.ListObjects(ctx, "bucketname", query)
if err != nil {
log.Fatal(err)
}
for _, obj := range objects.Results {
log.Printf("object name: %s, size: %v", obj.Name, obj.Size)
}
// if there are more results, objects.Next
// will be non-nil.
query = objects.Next
if query == nil {
break
}
}
log.Println("paginated through all object items in the bucket you specified.")
}
// Test if file exists in Google Storage
func fileQuery(client *http.Client, bucket, name string) (bool, error) {
ctx := cloud.NewContext("dummy", client)
query := &storage.Query{Prefix: name}
objects, err := storage.ListObjects(ctx, bucket, query)
if err != nil {
return false, err
}
if len(objects.Results) == 1 {
return true, nil
}
return false, nil
}
// listBucket lists the contents of a bucket in Google Cloud Storage.
func (d *demo) listBucket() {
io.WriteString(d.w, "\nListbucket result:\n")
query := &storage.Query{Prefix: "foo"}
for query != nil {
objs, err := storage.ListObjects(d.ctx, bucket, query)
if err != nil {
d.errorf("listBucket: unable to list bucket %q: %v", bucket, err)
return
}
query = objs.Next
for _, obj := range objs.Results {
d.dumpStats(obj)
}
}
}
func (d *demo) listDir(name, indent string) {
query := &storage.Query{Prefix: name, Delimiter: "/"}
for query != nil {
objs, err := storage.ListObjects(d.ctx, bucket, query)
if err != nil {
d.errorf("listBucketDirMode: unable to list bucket %q: %v", bucket, err)
return
}
query = objs.Next
for _, obj := range objs.Results {
fmt.Fprint(d.w, indent)
d.dumpStats(obj)
}
for _, dir := range objs.Prefixes {
fmt.Fprintf(d.w, "%v(directory: /%v/%v)\n", indent, bucket, dir)
d.listDir(dir, indent+" ")
}
}
}
