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Merge pull request #6 from SeanCheatham/function-block-store-abstraction
Create FunctionsStore and BlocksStore abstractions
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87 changes: 33 additions & 54 deletions
87
backend/core/src/main/scala/chainless/db/ObjectStore.scala
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,64 +1,43 @@ | ||
| package chainless.db | ||
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|
||
| import cats.data.OptionT | ||
| import cats.effect.Async | ||
| import cats.effect.implicits.* | ||
| import cats.implicits.* | ||
| import fs2.Stream | ||
| import chainless.models.* | ||
| import fs2.io.file.{Files, Path} | ||
| import org.typelevel.log4cats.Logger | ||
| import org.typelevel.log4cats.slf4j.Slf4jLogger | ||
| import fs2.{Chunk, Stream} | ||
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| /** Stores byte data in a directory structure. Data is stored in "revisions", meaning if a key already exists, a new | ||
| * revision is added (and marked "latest") instead of deleting the old entry. | ||
| * @param baseDir | ||
| * a base directory in which "buckets" of data are saved | ||
| */ | ||
| class ObjectStore[F[_]: Async: Files](baseDir: Path): | ||
| import java.nio.charset.StandardCharsets | ||
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| private given Logger[F] = Slf4jLogger.getLoggerFromName("ObjectStore") | ||
| class BlocksStore[F[_]: Async](baseDir: Path): | ||
| def saveBlock(block: BlockWithChain): F[Unit] = | ||
| Files[F].createDirectories(baseDir / block.meta.chain.name) >> | ||
| Stream(block.block) | ||
| .map(_.noSpaces) | ||
| .through(fs2.text.utf8.encode) | ||
| .through(Files[F].writeAll(baseDir / block.meta.chain.name / block.meta.blockId)) | ||
| .compile | ||
| .drain | ||
|
|
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| def save(bucket: String)(id: String)(data: Stream[F, Byte]): F[Unit] = | ||
| Logger[F].info(s"Saving id=$id") >> | ||
| (baseDir / bucket / id) | ||
| .pure[F] | ||
| .flatTap(Files[F].createDirectories(_)) | ||
| .flatMap(objectDir => | ||
| OptionT(contains(objectDir)) | ||
| .fold(0)(_ + 1) | ||
| .map(nextRevision => objectDir / nextRevision.toString) | ||
| .flatMap(file => Files[F].createFile(file) *> data.through(Files[F].writeAll(file)).compile.drain) | ||
| ) >> | ||
| Logger[F].info(s"Finished saving id=$id") | ||
|
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| def get(bucket: String)(id: String): Stream[F, Byte] = | ||
| Stream | ||
| .eval( | ||
| OptionT | ||
| .pure[F](baseDir / bucket / id) | ||
| .flatMap(objectDir => | ||
| OptionT(contains(objectDir)) | ||
| .map(revision => objectDir / revision.toString) | ||
| ) | ||
| .getOrRaise(new NoSuchElementException("No data")) | ||
| ) | ||
| .flatMap(Files[F].readAll) | ||
|
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| def exists(bucket: String)(id: String): F[Boolean] = | ||
| OptionT | ||
| .pure[F](baseDir / bucket / id) | ||
| .flatMap(objectDir => OptionT(contains(objectDir))) | ||
| .isDefined | ||
|
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| def delete(bucket: String)(id: String): F[Boolean] = | ||
| exists(bucket)(id) | ||
| .flatTap(Async[F].whenA(_)(Files[F].deleteRecursively(baseDir / bucket / id))) | ||
|
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| private def contains(objectDir: Path): F[Option[Int]] = | ||
| def getBlock(meta: BlockMeta): F[BlockWithChain] = | ||
| Files[F] | ||
| .list(objectDir) | ||
| .evalFilter(Files[F].isRegularFile(_)) | ||
| .map(_.fileName.toString.toIntOption) | ||
| .collect { case Some(i) => i } | ||
| .readAll(baseDir / meta.chain.name / meta.blockId) | ||
| .compile | ||
| .to(Chunk) | ||
| .map(chunk => new String(chunk.toArray[Byte], StandardCharsets.UTF_8)) | ||
| .map(io.circe.parser.parse) | ||
| .rethrow | ||
| .map(BlockWithChain(meta, _)) | ||
|
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| class FunctionsStore[F[_]: Async](baseDir: Path): | ||
| def get(id: String)(revision: Int): Stream[F, Byte] = | ||
| Files[F].readAll(baseDir / id / revision.toString) | ||
|
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| def delete(id: String): F[Unit] = | ||
| Files[F].deleteRecursively(baseDir / id) | ||
|
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| def save(id: String, revision: Int)(data: Stream[F, Byte]): F[Unit] = | ||
| Files[F].createDirectories(baseDir / id) >> data | ||
| .through(Files[F].writeAll(baseDir / id / revision.toString)) | ||
| .compile | ||
| .fold(-1)(_.max(_)) | ||
| .map(_.some.filter(_ >= 0)) | ||
| .drain |
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