Golang BucketResourcesMetadata.CommonPrefixes方法代碼示例

func (cache *cacheDriver) listObjects(keys []string, key string, r drivers.BucketResourcesMetadata) ([]string, drivers.BucketResourcesMetadata) {
	switch true {
	// Prefix absent, delimit object key based on delimiter
	case r.IsDelimiterSet():
		delim := delimiter(key, r.Delimiter)
		switch true {
		case delim == "" || delim == key:
			keys = appendUniq(keys, key)
		case delim != "":
			r.CommonPrefixes = appendUniq(r.CommonPrefixes, delim)
		}
	// Prefix present, delimit object key with prefix key based on delimiter
	case r.IsDelimiterPrefixSet():
		if strings.HasPrefix(key, r.Prefix) {
			trimmedName := strings.TrimPrefix(key, r.Prefix)
			delim := delimiter(trimmedName, r.Delimiter)
			keys, r = cache.filterDelimiterPrefix(keys, key, delim, r)
		}
	// Prefix present, nothing to delimit
	case r.IsPrefixSet():
		keys = appendUniq(keys, key)
	// Prefix and delimiter absent
	case r.IsDefault():
		keys = appendUniq(keys, key)
	}
	return keys, r
}

func (cache *cacheDriver) filterDelimiterPrefix(keys []string, key, delim string, r drivers.BucketResourcesMetadata) ([]string, drivers.BucketResourcesMetadata) {
	switch true {
	case key == r.Prefix:
		keys = appendUniq(keys, key)
	// delim - requires r.Prefix as it was trimmed off earlier
	case key == r.Prefix+delim:
		keys = appendUniq(keys, key)
	case delim != "":
		r.CommonPrefixes = appendUniq(r.CommonPrefixes, r.Prefix+delim)
	}
	return keys, r
}

// ListObjects - returns list of objects
func (d donutDriver) ListObjects(bucketName string, resources drivers.BucketResourcesMetadata) ([]drivers.ObjectMetadata, drivers.BucketResourcesMetadata, error) {
	errParams := map[string]string{
		"bucketName": bucketName,
	}
	if d.donut == nil {
		return nil, drivers.BucketResourcesMetadata{}, iodine.New(drivers.InternalError{}, errParams)
	}
	if !drivers.IsValidBucket(bucketName) || strings.Contains(bucketName, ".") {
		return nil, drivers.BucketResourcesMetadata{}, iodine.New(drivers.BucketNameInvalid{Bucket: bucketName}, nil)
	}
	if !drivers.IsValidObjectName(resources.Prefix) {
		return nil, drivers.BucketResourcesMetadata{}, iodine.New(drivers.ObjectNameInvalid{Object: resources.Prefix}, nil)
	}
	actualObjects, commonPrefixes, isTruncated, err := d.donut.ListObjects(bucketName, resources.Prefix, resources.Marker, resources.Delimiter,
		resources.Maxkeys)
	if err != nil {
		return nil, drivers.BucketResourcesMetadata{}, iodine.New(err, errParams)
	}
	resources.CommonPrefixes = commonPrefixes
	resources.IsTruncated = isTruncated
	if resources.IsTruncated && resources.IsDelimiterSet() {
		resources.NextMarker = actualObjects[len(actualObjects)-1]
	}
	var results []drivers.ObjectMetadata
	for _, objectName := range actualObjects {
		objectMetadata, err := d.donut.GetObjectMetadata(bucketName, objectName)
		if err != nil {
			return nil, drivers.BucketResourcesMetadata{}, iodine.New(err, errParams)
		}
		t, err := time.Parse(time.RFC3339Nano, objectMetadata["created"])
		if err != nil {
			return nil, drivers.BucketResourcesMetadata{}, iodine.New(err, nil)
		}
		size, err := strconv.ParseInt(objectMetadata["size"], 10, 64)
		if err != nil {
			return nil, drivers.BucketResourcesMetadata{}, iodine.New(err, nil)
		}
		metadata := drivers.ObjectMetadata{
			Key:     objectName,
			Created: t,
			Size:    size,
		}
		results = append(results, metadata)
	}
	sort.Sort(byObjectKey(results))
	return results, resources, nil
}

// ListObjects - returns list of objects
func (d donutDriver) ListObjects(bucketName string, resources drivers.BucketResourcesMetadata) ([]drivers.ObjectMetadata, drivers.BucketResourcesMetadata, error) {
	d.lock.RLock()
	defer d.lock.RUnlock()
	errParams := map[string]string{
		"bucketName": bucketName,
	}
	if d.donut == nil {
		return nil, drivers.BucketResourcesMetadata{}, iodine.New(drivers.InternalError{}, errParams)
	}
	if !drivers.IsValidBucket(bucketName) {
		return nil, drivers.BucketResourcesMetadata{}, iodine.New(drivers.BucketNameInvalid{Bucket: bucketName}, nil)
	}
	if !drivers.IsValidObjectName(resources.Prefix) {
		return nil, drivers.BucketResourcesMetadata{}, iodine.New(drivers.ObjectNameInvalid{Object: resources.Prefix}, nil)
	}
	listObjects, err := d.donut.ListObjects(bucketName, resources.Prefix, resources.Marker, resources.Delimiter, resources.Maxkeys)
	if err != nil {
		return nil, drivers.BucketResourcesMetadata{}, iodine.New(err, errParams)
	}
	resources.CommonPrefixes = listObjects.CommonPrefixes
	resources.IsTruncated = listObjects.IsTruncated
	var results []drivers.ObjectMetadata
	for _, objMetadata := range listObjects.Objects {
		metadata := drivers.ObjectMetadata{
			Key:     objMetadata.Object,
			Created: objMetadata.Created,
			Size:    objMetadata.Size,
		}
		results = append(results, metadata)
	}
	sort.Sort(byObjectName(results))
	if resources.IsTruncated && resources.IsDelimiterSet() {
		resources.NextMarker = results[len(results)-1].Key
	}
	return results, resources, nil
}

func (fs *fsDriver) filterObjects(bucket, name string, file os.FileInfo, resources drivers.BucketResourcesMetadata) (drivers.ObjectMetadata, drivers.BucketResourcesMetadata, error) {
	var err error
	var metadata drivers.ObjectMetadata

	switch true {
	// Both delimiter and Prefix is present
	case resources.IsDelimiterPrefixSet():
		if strings.HasPrefix(name, resources.Prefix) {
			trimmedName := strings.TrimPrefix(name, resources.Prefix)
			delimitedName := delimiter(trimmedName, resources.Delimiter)
			switch true {
			case name == resources.Prefix:
				// Use resources.Prefix to filter out delimited files
				metadata, err = fs.GetObjectMetadata(bucket, name)
				if err != nil {
					return drivers.ObjectMetadata{}, resources, iodine.New(err, nil)
				}
			case delimitedName == file.Name():
				// Use resources.Prefix to filter out delimited files
				metadata, err = fs.GetObjectMetadata(bucket, name)
				if err != nil {
					return drivers.ObjectMetadata{}, resources, iodine.New(err, nil)
				}
			case delimitedName != "":
				resources.CommonPrefixes = appendUniq(resources.CommonPrefixes, resources.Prefix+delimitedName)
			}
		}
	// Delimiter present and Prefix is absent
	case resources.IsDelimiterSet():
		delimitedName := delimiter(name, resources.Delimiter)
		switch true {
		case delimitedName == "":
			metadata, err = fs.GetObjectMetadata(bucket, name)
			if err != nil {
				return drivers.ObjectMetadata{}, resources, iodine.New(err, nil)
			}
		case delimitedName == file.Name():
			metadata, err = fs.GetObjectMetadata(bucket, name)
			if err != nil {
				return drivers.ObjectMetadata{}, resources, iodine.New(err, nil)
			}
		case delimitedName != "":
			resources.CommonPrefixes = appendUniq(resources.CommonPrefixes, delimitedName)
		}
	// Delimiter is absent and only Prefix is present
	case resources.IsPrefixSet():
		if strings.HasPrefix(name, resources.Prefix) {
			// Do not strip prefix object output
			metadata, err = fs.GetObjectMetadata(bucket, name)
			if err != nil {
				return drivers.ObjectMetadata{}, resources, iodine.New(err, nil)
			}
		}
	case resources.IsDefault():
		metadata, err = fs.GetObjectMetadata(bucket, name)
		if err != nil {
			return drivers.ObjectMetadata{}, resources, iodine.New(err, nil)
		}
	}

	return metadata, resources, nil
}