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Merge pull request #74 from aalda/flatten_history
Flatten history tree package
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,80 @@ | ||
| /* | ||
| Copyright 2018 Banco Bilbao Vizcaya Argentaria, S.A. | ||
| Licensed under the Apache License, Version 2.0 (the "License"); | ||
| you may not use this file except in compliance with the License. | ||
| You may obtain a copy of the License at | ||
| http://www.apache.org/licenses/LICENSE-2.0 | ||
| Unless required by applicable law or agreed to in writing, software | ||
| distributed under the License is distributed on an "AS IS" BASIS, | ||
| WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| See the License for the specific language governing permissions and | ||
| limitations under the License. | ||
| */ | ||
|
|
||
| package history | ||
|
|
||
| import ( | ||
| "fmt" | ||
|
|
||
| "github.com/bbva/qed/balloon/cache" | ||
| "github.com/bbva/qed/hashing" | ||
| ) | ||
|
|
||
| type auditPathVisitor struct { | ||
| hasher hashing.Hasher | ||
| cache cache.Cache | ||
|
|
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| auditPath AuditPath | ||
| } | ||
|
|
||
| func newAuditPathVisitor(hasher hashing.Hasher, cache cache.Cache) *auditPathVisitor { | ||
| return &auditPathVisitor{ | ||
| hasher: hasher, | ||
| cache: cache, | ||
| auditPath: make(AuditPath), | ||
| } | ||
| } | ||
|
|
||
| func (v auditPathVisitor) Result() AuditPath { | ||
| return v.auditPath | ||
| } | ||
|
|
||
| func (v *auditPathVisitor) VisitLeafHashOp(op leafHashOp) hashing.Digest { | ||
| return v.hasher.Salted(op.Position().Bytes(), op.Value) | ||
| } | ||
|
|
||
| func (v *auditPathVisitor) VisitInnerHashOp(op innerHashOp) hashing.Digest { | ||
| leftHash := op.Left.Accept(v) | ||
| rightHash := op.Right.Accept(v) | ||
| return v.hasher.Salted(op.Position().Bytes(), leftHash, rightHash) | ||
| } | ||
|
|
||
| func (v *auditPathVisitor) VisitPartialInnerHashOp(op partialInnerHashOp) hashing.Digest { | ||
| leftHash := op.Left.Accept(v) | ||
| return v.hasher.Salted(op.Position().Bytes(), leftHash) | ||
| } | ||
|
|
||
| func (v *auditPathVisitor) VisitGetCacheOp(op getCacheOp) hashing.Digest { | ||
| hash, ok := v.cache.Get(op.Position().Bytes()) | ||
| if !ok { | ||
| panic(fmt.Sprintf("Oops, something went wrong. There should be a cached element at position %v", op.Position())) | ||
| } | ||
| return hash | ||
| } | ||
|
|
||
| func (v *auditPathVisitor) VisitPutCacheOp(op putCacheOp) hashing.Digest { | ||
| return op.operation.Accept(v) | ||
| } | ||
|
|
||
| func (v *auditPathVisitor) VisitMutateOp(op mutateOp) hashing.Digest { | ||
| return op.operation.Accept(v) | ||
| } | ||
|
|
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| func (v *auditPathVisitor) VisitCollectOp(op collectOp) hashing.Digest { | ||
| hash := op.operation.Accept(v) | ||
| v.auditPath[op.Position().FixedBytes()] = hash | ||
| return hash | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,71 @@ | ||
| /* | ||
| Copyright 2018 Banco Bilbao Vizcaya Argentaria, S.A. | ||
| Licensed under the Apache License, Version 2.0 (the "License"); | ||
| you may not use this file except in compliance with the License. | ||
| You may obtain a copy of the License at | ||
| http://www.apache.org/licenses/LICENSE-2.0 | ||
| Unless required by applicable law or agreed to in writing, software | ||
| distributed under the License is distributed on an "AS IS" BASIS, | ||
| WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| See the License for the specific language governing permissions and | ||
| limitations under the License. | ||
| */ | ||
|
|
||
| package history | ||
|
|
||
| import ( | ||
| "fmt" | ||
|
|
||
| "github.com/bbva/qed/balloon/cache" | ||
| "github.com/bbva/qed/hashing" | ||
| ) | ||
|
|
||
| type computeHashVisitor struct { | ||
| hasher hashing.Hasher | ||
| cache cache.Cache | ||
| } | ||
|
|
||
| func newComputeHashVisitor(hasher hashing.Hasher, cache cache.Cache) *computeHashVisitor { | ||
| return &computeHashVisitor{ | ||
| hasher: hasher, | ||
| cache: cache, | ||
| } | ||
| } | ||
|
|
||
| func (v *computeHashVisitor) VisitLeafHashOp(op leafHashOp) hashing.Digest { | ||
| return v.hasher.Salted(op.Position().Bytes(), op.Value) | ||
| } | ||
|
|
||
| func (v *computeHashVisitor) VisitInnerHashOp(op innerHashOp) hashing.Digest { | ||
| leftHash := op.Left.Accept(v) | ||
| rightHash := op.Right.Accept(v) | ||
| return v.hasher.Salted(op.Position().Bytes(), leftHash, rightHash) | ||
| } | ||
|
|
||
| func (v *computeHashVisitor) VisitPartialInnerHashOp(op partialInnerHashOp) hashing.Digest { | ||
| leftHash := op.Left.Accept(v) | ||
| return v.hasher.Salted(op.Position().Bytes(), leftHash) | ||
| } | ||
|
|
||
| func (v *computeHashVisitor) VisitGetCacheOp(op getCacheOp) hashing.Digest { | ||
| hash, ok := v.cache.Get(op.Position().Bytes()) | ||
| if !ok { // TODO maybe we should return an error | ||
| panic(fmt.Sprintf("Oops, something went wrong. There should be a cached element at position %v", op.Position())) | ||
| } | ||
| return hash | ||
| } | ||
|
|
||
| func (v *computeHashVisitor) VisitPutCacheOp(op putCacheOp) hashing.Digest { | ||
| return op.operation.Accept(v) | ||
| } | ||
|
|
||
| func (v *computeHashVisitor) VisitMutateOp(op mutateOp) hashing.Digest { | ||
| return op.operation.Accept(v) | ||
| } | ||
|
|
||
| func (v *computeHashVisitor) VisitCollectOp(op collectOp) hashing.Digest { | ||
| return op.operation.Accept(v) | ||
| } |
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