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157 changes: 157 additions & 0 deletions
157
core.coordinator/src/main/scala/dev/kamu/cli/metadata/MetadataChain.scala
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,157 @@ | ||
| /* | ||
| * Copyright (c) 2018 kamu.dev | ||
| * | ||
| * This Source Code Form is subject to the terms of the Mozilla Public | ||
| * License, v. 2.0. If a copy of the MPL was not distributed with this | ||
| * file, You can obtain one at http://mozilla.org/MPL/2.0/. | ||
| */ | ||
|
|
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| package dev.kamu.cli.metadata | ||
|
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| import java.nio.charset.StandardCharsets | ||
| import java.security.MessageDigest | ||
| import java.time.Instant | ||
|
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| import dev.kamu.core.manifests._ | ||
| import dev.kamu.core.manifests.parsing.pureconfig.yaml | ||
| import dev.kamu.core.manifests.parsing.pureconfig.yaml.defaults._ | ||
| import dev.kamu.core.utils.fs._ | ||
| import org.apache.hadoop.fs.{FileSystem, Path} | ||
| import pureconfig.{ConfigReader, ConfigWriter, Derivation} | ||
| import pureconfig.generic.auto._ | ||
|
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| import scala.reflect.ClassTag | ||
|
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| class MetadataChain(fileSystem: FileSystem, datasetDir: Path) { | ||
|
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| def init(ds: DatasetSnapshot, systemTime: Instant): Unit = { | ||
| val initialBlock = MetadataBlock( | ||
| prevBlockHash = "", | ||
| systemTime = systemTime, | ||
| source = Some(ds.source) | ||
| ).hashed() | ||
|
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| val initialSummary = DatasetSummary( | ||
| id = ds.id, | ||
| kind = ds.kind, | ||
| datasetDependencies = ds.dependsOn.toSet, | ||
| vocabulary = ds.vocabulary, | ||
| lastPulled = None, | ||
| numRecords = 0, | ||
| dataSize = 0 | ||
| ) | ||
|
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| try { | ||
| fileSystem.mkdirs(blocksDir) | ||
| saveResource(initialSummary, summaryPath) | ||
| saveResource(initialBlock, blocksDir.resolve(initialBlock.blockHash)) | ||
| } catch { | ||
| case e: Exception => | ||
| fileSystem.delete(datasetDir, true) | ||
| throw e | ||
| } | ||
| } | ||
|
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| // TODO: add invariant validation | ||
| def append(_block: MetadataBlock): MetadataBlock = { | ||
| val block = _block.hashed() | ||
| saveResource(block, blocksDir.resolve(block.blockHash)) | ||
| block | ||
| } | ||
|
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| def getSummary(): DatasetSummary = { | ||
| loadResource[DatasetSummary](summaryPath) | ||
| } | ||
|
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| def updateSummary( | ||
| update: DatasetSummary => DatasetSummary | ||
| ): DatasetSummary = { | ||
| val newSummary = update(getSummary()) | ||
| saveResource(newSummary, summaryPath) | ||
| newSummary | ||
| } | ||
|
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| def getSnapshot(): DatasetSnapshot = { | ||
| val summary = getSummary() | ||
|
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| val source = getBlocks().reverse | ||
| .flatMap(_.source) | ||
| .head | ||
|
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| DatasetSnapshot( | ||
| id = summary.id, | ||
| source = source, | ||
| vocabulary = summary.vocabulary | ||
| ) | ||
| } | ||
|
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| /** Returns metadata blocks in historical order */ | ||
| def getBlocks(): Vector[MetadataBlock] = { | ||
| val blocks = fileSystem | ||
| .listStatus(blocksDir) | ||
| .map(_.getPath) | ||
| .map(loadResource[MetadataBlock]) | ||
| .map(b => (b.blockHash, b)) | ||
| .toMap | ||
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| val nextBlocks = blocks.values | ||
| .map(b => (b.prevBlockHash, b.blockHash)) | ||
| .toMap | ||
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| val blocksOrdered = | ||
| new scala.collection.immutable.VectorBuilder[MetadataBlock]() | ||
|
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| var parentBlockHash = "" | ||
| while (nextBlocks.contains(parentBlockHash)) { | ||
| parentBlockHash = nextBlocks(parentBlockHash) | ||
| blocksOrdered += blocks(parentBlockHash) | ||
| } | ||
|
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| blocksOrdered.result() | ||
| } | ||
|
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| protected def summaryPath: Path = datasetDir.resolve("summary") | ||
|
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| protected def blocksDir: Path = datasetDir.resolve("blocks") | ||
|
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| ///////////////////////////////////////////////////////////////////////////// | ||
| // Helpers | ||
| ///////////////////////////////////////////////////////////////////////////// | ||
|
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| protected def saveResource[T <: Resource: ClassTag](obj: T, path: Path)( | ||
| implicit derivation: Derivation[ConfigWriter[Manifest[T]]] | ||
| ): Unit = { | ||
| val outputStream = fileSystem.create(path) | ||
| try { | ||
| yaml.save(Manifest(obj), outputStream) | ||
| } finally { | ||
| outputStream.close() | ||
| } | ||
| } | ||
|
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| protected def loadResource[T <: Resource: ClassTag](path: Path)( | ||
| implicit derivation: Derivation[ConfigReader[Manifest[T]]] | ||
| ): T = { | ||
| val inputStream = fileSystem.open(path) | ||
| try { | ||
| yaml.load[Manifest[T]](inputStream).content | ||
| } finally { | ||
| inputStream.close() | ||
| } | ||
| } | ||
|
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| protected implicit class MetadataBlockEx(b: MetadataBlock) { | ||
| def hashed(): MetadataBlock = { | ||
| val digest = MessageDigest.getInstance("sha-256") | ||
| val repr = yaml.saveStr(b) | ||
|
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| val blockHash = digest | ||
| .digest(repr.getBytes(StandardCharsets.UTF_8)) | ||
| .map("%02x".format(_)) | ||
| .mkString | ||
|
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| b.copy(blockHash = blockHash) | ||
| } | ||
| } | ||
|
|
||
| } |
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