mirror of https://github.com/perkeep/perkeep.git
66 lines
1.7 KiB
Go
66 lines
1.7 KiB
Go
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/*
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Copyright 2013 Google Inc.
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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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http://www.apache.org/licenses/LICENSE-2.0
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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 blobserver
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import (
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"hash"
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"io"
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"camlistore.org/pkg/blob"
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)
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// Receive wraps calling a BlobReceiver's ReceiveBlob method,
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// additionally providing verification of the src digest, and also
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// notifying the blob hub on success.
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func Receive(dst BlobReceiver, br blob.Ref, src io.Reader) (blob.SizedRef, error) {
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return receive(dst, br, src, true)
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}
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func ReceiveNoHash(dst BlobReceiver, br blob.Ref, src io.Reader) (blob.SizedRef, error) {
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return receive(dst, br, src, false)
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}
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func receive(dst BlobReceiver, br blob.Ref, src io.Reader, checkHash bool) (sb blob.SizedRef, err error) {
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if checkHash {
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src = &checkHashReader{br.Hash(), br, src}
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}
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sb, err = dst.ReceiveBlob(br, src)
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if err != nil {
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return
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}
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GetHub(dst).NotifyBlobReceived(sb.Ref)
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return
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}
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// checkHashReader is an io.Reader that wraps the src Reader but turns
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// an io.EOF into an ErrCorruptBlob if the data read doesn't match the
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// hash of br.
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type checkHashReader struct {
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h hash.Hash
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br blob.Ref
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src io.Reader
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}
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func (c *checkHashReader) Read(p []byte) (n int, err error) {
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n, err = c.src.Read(p)
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c.h.Write(p[:n])
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if err == io.EOF && !c.br.HashMatches(c.h) {
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err = ErrCorruptBlob
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}
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return
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}
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