62 lines
1.5 KiB
Go
62 lines
1.5 KiB
Go
// Copyright (C) 2018 Storj Labs, Inc.
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// See LICENSE for copying information.
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package ranger
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import (
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"bytes"
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"io"
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"io/ioutil"
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"storj.io/storj/internal/pkg/readcloser"
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"storj.io/storj/pkg/piecestore/rpc/client"
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)
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type grpcRanger struct {
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c *client.Client
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id string
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size int64
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}
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// GRPCRanger turns a gRPC connection to piece store into a Ranger
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func GRPCRanger(c *client.Client, id string) (Ranger, error) {
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piece, err := c.PieceMetaRequest(id)
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if err != nil {
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return nil, err
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}
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return &grpcRanger{c: c, id: id, size: piece.Size}, nil
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}
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// GRPCRangerSize creates a GRPCRanger with known size.
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// Use it if you know the piece size. This will safe the extra request for
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// retrieving the piece size from the piece storage.
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func GRPCRangerSize(c *client.Client, id string, size int64) Ranger {
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return &grpcRanger{c: c, id: id, size: size}
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}
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// Size implements Ranger.Size
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func (r *grpcRanger) Size() int64 {
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return r.size
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}
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// Range implements Ranger.Range
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func (r *grpcRanger) Range(offset, length int64) io.ReadCloser {
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if offset < 0 {
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return readcloser.FatalReadCloser(Error.New("negative offset"))
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}
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if length < 0 {
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return readcloser.FatalReadCloser(Error.New("negative length"))
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}
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if offset+length > r.size {
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return readcloser.FatalReadCloser(Error.New("range beyond end"))
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}
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if length == 0 {
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return ioutil.NopCloser(bytes.NewReader([]byte{}))
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}
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reader, err := r.c.RetrievePieceRequest(r.id, offset, length)
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if err != nil {
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return readcloser.FatalReadCloser(Error.Wrap(err))
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}
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return reader
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}
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