Dragonfly2

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/*
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 *     Copyright 2022 The Dragonfly Authors
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 *
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 * Licensed under the Apache License, Version 2.0 (the "License");
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 * you may not use this file except in compliance with the License.
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 * You may obtain a copy of the License at
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 *
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 *      http://www.apache.org/licenses/LICENSE-2.0
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 *
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 * Unless required by applicable law or agreed to in writing, software
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 * distributed under the License is distributed on an "AS IS" BASIS,
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 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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 * See the License for the specific language governing permissions and
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 * limitations under the License.
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 */
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package resource
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import (
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	"time"
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	commonv2 "d7y.io/api/v2/pkg/apis/common/v2"
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	"d7y.io/dragonfly/v2/pkg/digest"
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)
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// IsPieceBackToSource returns whether the piece is downloaded back-to-source.
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func IsPieceBackToSource(parentID string) bool {
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	return parentID == ""
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}
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// Piece represents information of piece.
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type Piece struct {
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	// Piece number.
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	Number int32
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	// Parent peer id.
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	ParentID string
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	// Piece offset.
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	Offset uint64
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	// Piece length.
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	Length uint64
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	// Digest of the piece data.
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	Digest *digest.Digest
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	// Traffic type.
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	TrafficType commonv2.TrafficType
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	// Downloading piece costs time.
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	Cost time.Duration
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	// Piece create time.
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	CreatedAt time.Time
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}
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