mirror of https://github.com/perkeep/perkeep.git
73 lines
1.8 KiB
Go
73 lines
1.8 KiB
Go
/*
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Copyright 2014 The Perkeep Authors
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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 "perkeep.org/pkg/blob"
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// ListMissingDestinationBlobs reads from 'srcch' and 'dstch' (sorted
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// enumerations of blobs from two blob servers) and sends to
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// 'destMissing' any blobs which appear on the source but not at the
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// destination.
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//
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// destMissing is closed at the end.
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//
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// If an invalid (zero) blob from srcch or dstch arrives,
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// ListMissingDestinationBlobs stops.
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func ListMissingDestinationBlobs(destMissing chan<- blob.SizedRef, sizeMismatch func(blob.Ref), srcch, dstch <-chan blob.SizedRef) {
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defer close(destMissing)
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src := &blob.ChanPeeker{Ch: srcch}
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dst := &blob.ChanPeeker{Ch: dstch}
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for {
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srcSized, ok := src.Peek()
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if !ok {
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break
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}
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if !srcSized.Ref.Valid() {
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return
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}
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// If the destination has reached its end, anything
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// remaining in the source is needed.
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if _, ok := dst.Peek(); !ok {
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destMissing <- src.MustTake()
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continue
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}
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srcBlob := src.MustPeek().Ref
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dstRef := dst.MustPeek().Ref
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if !dstRef.Valid() {
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return
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}
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switch {
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case srcBlob == dstRef:
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// Skip both
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sb := src.MustTake()
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db := dst.MustTake()
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if sb.Size != db.Size {
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sizeMismatch(sb.Ref)
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}
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case srcBlob.Less(dstRef):
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destMissing <- src.MustTake()
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case dstRef.Less(srcBlob):
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dst.Take()
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}
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}
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}
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