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Ensure that content IDs are unique in a Nessie repository
Nessie content IDs are random IDs, but we do not guarantee that those are actually really unique. This change adds a new object type to ensure that a generated ID is unique by leveraging existing functionality of the `Persist` framework that already provides "`INSERT IF NOT EXIST`" guarantees. New content IDs from this change on are now verified. This change does not include functionality to automatically add already existing content-IDs. IMHO it is probably okay for now given the practically non-existing probability of content-ID conflicts.
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62 changes: 62 additions & 0 deletions
62
...common/src/main/java/org/projectnessie/versioned/storage/common/objtypes/UniqueIdObj.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,62 @@ | ||
| /* | ||
| * Copyright (C) 2022 Dremio | ||
| * | ||
| * 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 org.projectnessie.versioned.storage.common.objtypes; | ||
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| import static org.projectnessie.versioned.storage.common.objtypes.Hashes.uniqueIdHash; | ||
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| import javax.annotation.Nullable; | ||
| import org.immutables.value.Value; | ||
| import org.projectnessie.versioned.storage.common.logic.ReferenceLogic; | ||
| import org.projectnessie.versioned.storage.common.persist.Obj; | ||
| import org.projectnessie.versioned.storage.common.persist.ObjId; | ||
| import org.projectnessie.versioned.storage.common.persist.ObjType; | ||
| import org.projectnessie.versioned.storage.common.persist.Persist; | ||
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| /** | ||
| * Describes the <em>internal</em> state of a reference when it has been created, managed by {@link | ||
| * ReferenceLogic} implementations, not available/tracked for transactional {@link Persist} | ||
| * instances. | ||
| */ | ||
| @Value.Immutable | ||
| public interface UniqueIdObj extends Obj { | ||
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| @Override | ||
| default ObjType type() { | ||
| return ObjType.UNIQUE; | ||
| } | ||
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| @Override | ||
| @Value.Parameter(order = 1) | ||
| @Nullable | ||
| @jakarta.annotation.Nullable | ||
| ObjId id(); | ||
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| /** The "ID space", for example {@code content-id}. */ | ||
| @Value.Parameter(order = 2) | ||
| String space(); | ||
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| /** The value of the ID within the {@link #space()}. */ | ||
| @Value.Parameter(order = 3) | ||
| String value(); | ||
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| static UniqueIdObj uniqueId(ObjId id, String space, String value) { | ||
| return ImmutableUniqueIdObj.of(id, space, value); | ||
| } | ||
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| static UniqueIdObj uniqueId(String space, String value) { | ||
| return uniqueId(uniqueIdHash(space, value), space, value); | ||
| } | ||
| } |
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