405 lines
12 KiB
Nim
405 lines
12 KiB
Nim
## Nim-Codex
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## Copyright (c) 2022 Status Research & Development GmbH
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## Licensed under either of
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## * Apache License, version 2.0, ([LICENSE-APACHE](LICENSE-APACHE))
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## * MIT license ([LICENSE-MIT](LICENSE-MIT))
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## at your option.
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## This file may not be copied, modified, or distributed except according to
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## those terms.
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import pkg/upraises
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push: {.upraises: [].}
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import pkg/chronos
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import pkg/chronicles
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import pkg/libp2p
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import pkg/questionable
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import pkg/questionable/results
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import pkg/datastore
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import pkg/stew/endians2
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import ./blockstore
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import ./keyutils
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import ../blocktype
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import ../clock
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import ../systemclock
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export blocktype, libp2p
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logScope:
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topics = "codex repostore"
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const
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DefaultBlockTtl* = 24.hours
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DefaultQuotaBytes* = 1'u shl 33'u # ~8GB
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type
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QuotaUsedError* = object of CodexError
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QuotaNotEnoughError* = object of CodexError
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RepoStore* = ref object of BlockStore
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postFixLen*: int
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repoDs*: Datastore
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metaDs*: Datastore
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clock: Clock
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quotaMaxBytes*: uint # maximum available bytes
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quotaUsedBytes*: uint # bytes used by the repo
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quotaReservedBytes*: uint # bytes reserved by the repo
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blockTtl*: Duration
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started*: bool
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BlockExpiration* = object
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cid*: Cid
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expiration*: SecondsSince1970
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GetNext = proc(): Future[?BlockExpiration] {.upraises: [], gcsafe, closure.}
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BlockExpirationIter* = ref object
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finished*: bool
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next*: GetNext
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iterator items*(q: BlockExpirationIter): Future[?BlockExpiration] =
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while not q.finished:
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yield q.next()
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func totalUsed*(self: RepoStore): uint =
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(self.quotaUsedBytes + self.quotaReservedBytes)
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func available*(self: RepoStore): uint =
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return self.quotaMaxBytes - self.totalUsed
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func available*(self: RepoStore, bytes: uint): bool =
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return bytes < self.available()
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method getBlock*(self: RepoStore, cid: Cid): Future[?!Block] {.async.} =
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## Get a block from the blockstore
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##
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without key =? makePrefixKey(self.postFixLen, cid), err:
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trace "Error getting key from provider", err = err.msg
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return failure(err)
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without data =? await self.repoDs.get(key), err:
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if not (err of DatastoreKeyNotFound):
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trace "Error getting block from datastore", err = err.msg, key
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return failure(err)
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return failure(newException(BlockNotFoundError, err.msg))
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trace "Got block for cid", cid
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return Block.new(cid, data)
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proc getBlockExpirationTimestamp(self: RepoStore, ttl: ?Duration): SecondsSince1970 =
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let duration = ttl |? self.blockTtl
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self.clock.now() + duration.seconds
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proc getBlockExpirationEntry(self: RepoStore, batch: var seq[BatchEntry], cid: Cid, ttl: ?Duration): ?!BatchEntry =
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without key =? createBlockExpirationMetadataKey(cid), err:
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return failure(err)
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let value = self.getBlockExpirationTimestamp(ttl).toBytes
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return success((key, value))
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method putBlock*(
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self: RepoStore,
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blk: Block,
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ttl = Duration.none): Future[?!void] {.async.} =
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## Put a block to the blockstore
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##
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without key =? makePrefixKey(self.postFixLen, blk.cid), err:
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trace "Error getting key from provider", err = err.msg
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return failure(err)
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if await key in self.repoDs:
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trace "Block already in store", cid = blk.cid
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return success()
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if (self.totalUsed + blk.data.len.uint) > self.quotaMaxBytes:
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error "Cannot store block, quota used!", used = self.totalUsed
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return failure(
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newException(QuotaUsedError, "Cannot store block, quota used!"))
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trace "Storing block with key", key
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var
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batch: seq[BatchEntry]
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let
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used = self.quotaUsedBytes + blk.data.len.uint
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if err =? (await self.repoDs.put(key, blk.data)).errorOption:
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trace "Error storing block", err = err.msg
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return failure(err)
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trace "Updating quota", used
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batch.add((QuotaUsedKey, @(used.uint64.toBytesBE)))
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without blockExpEntry =? self.getBlockExpirationEntry(batch, blk.cid, ttl), err:
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trace "Unable to create block expiration metadata key", err = err.msg
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return failure(err)
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batch.add(blockExpEntry)
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if err =? (await self.metaDs.put(batch)).errorOption:
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trace "Error updating quota bytes", err = err.msg
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if err =? (await self.repoDs.delete(key)).errorOption:
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trace "Error deleting block after failed quota update", err = err.msg
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return failure(err)
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return failure(err)
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self.quotaUsedBytes = used
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return success()
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proc updateQuotaBytesUsed(self: RepoStore, blk: Block): Future[?!void] {.async.} =
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let used = self.quotaUsedBytes - blk.data.len.uint
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if err =? (await self.metaDs.put(
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QuotaUsedKey,
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@(used.uint64.toBytesBE))).errorOption:
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trace "Error updating quota key!", err = err.msg
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return failure(err)
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self.quotaUsedBytes = used
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return success()
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proc removeBlockExpirationEntry(self: RepoStore, cid: Cid): Future[?!void] {.async.} =
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without key =? createBlockExpirationMetadataKey(cid), err:
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return failure(err)
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return await self.metaDs.delete(key)
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method delBlock*(self: RepoStore, cid: Cid): Future[?!void] {.async.} =
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## Delete a block from the blockstore
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##
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trace "Deleting block", cid
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if blk =? (await self.getBlock(cid)):
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if key =? makePrefixKey(self.postFixLen, cid) and
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err =? (await self.repoDs.delete(key)).errorOption:
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trace "Error deleting block!", err = err.msg
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return failure(err)
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if isErr (await self.updateQuotaBytesUsed(blk)):
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trace "Unable to update quote-bytes-used in metadata store"
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return failure("Unable to update quote-bytes-used in metadata store")
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if isErr (await self.removeBlockExpirationEntry(blk.cid)):
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trace "Unable to remove block expiration entry from metadata store"
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return failure("Unable to remove block expiration entry from metadata store")
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trace "Deleted block", cid, totalUsed = self.totalUsed
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return success()
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method hasBlock*(self: RepoStore, cid: Cid): Future[?!bool] {.async.} =
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## Check if the block exists in the blockstore
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##
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without key =? makePrefixKey(self.postFixLen, cid), err:
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trace "Error getting key from provider", err = err.msg
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return failure(err)
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return await self.repoDs.has(key)
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method listBlocks*(
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self: RepoStore,
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blockType = BlockType.Manifest): Future[?!BlocksIter] {.async.} =
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## Get the list of blocks in the RepoStore.
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## This is an intensive operation
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##
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var
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iter = BlocksIter()
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let key =
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case blockType:
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of BlockType.Manifest: CodexManifestKey
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of BlockType.Block: CodexBlocksKey
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of BlockType.Both: CodexRepoKey
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without queryIter =? (await self.repoDs.query(Query.init(key))), err:
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trace "Error querying cids in repo", blockType, err = err.msg
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return failure(err)
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proc next(): Future[?Cid] {.async.} =
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await idleAsync()
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iter.finished = queryIter.finished
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if not queryIter.finished:
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if pair =? (await queryIter.next()) and cid =? pair.key:
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trace "Retrieved record from repo", cid
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return Cid.init(cid.value).option
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return Cid.none
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iter.next = next
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return success iter
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proc createBlockExpirationQuery(maxNumber: int, offset: int): ?!Query =
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let queryKey = ? createBlockExpirationMetadataQueryKey()
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success Query.init(queryKey, offset = offset, limit = maxNumber)
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method getBlockExpirations*(self: RepoStore, maxNumber: int, offset: int): Future[?!BlockExpirationIter] {.async, base.} =
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without query =? createBlockExpirationQuery(maxNumber, offset), err:
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trace "Unable to format block expirations query"
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return failure(err)
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without queryIter =? (await self.metaDs.query(query)), err:
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trace "Unable to execute block expirations query"
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return failure(err)
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var iter = BlockExpirationIter()
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proc next(): Future[?BlockExpiration] {.async.} =
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if not queryIter.finished:
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if pair =? (await queryIter.next()) and blockKey =? pair.key:
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let expirationTimestamp = pair.data
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let cidResult = Cid.init(blockKey.value)
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if not cidResult.isOk:
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raiseAssert("Unable to parse CID from blockKey.value: " & blockKey.value & $cidResult.error)
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return BlockExpiration(
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cid: cidResult.get,
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expiration: expirationTimestamp.toSecondsSince1970
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).some
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else:
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discard await queryIter.dispose()
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iter.finished = true
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return BlockExpiration.none
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iter.next = next
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return success iter
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method close*(self: RepoStore): Future[void] {.async.} =
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## Close the blockstore, cleaning up resources managed by it.
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## For some implementations this may be a no-op
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##
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(await self.repoDs.close()).expect("Should close datastore")
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proc hasBlock*(self: RepoStore, cid: Cid): Future[?!bool] {.async.} =
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## Check if the block exists in the blockstore.
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## Return false if error encountered
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##
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without key =? makePrefixKey(self.postFixLen, cid), err:
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trace "Error getting key from provider", err = err.msg
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return failure(err.msg)
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return await self.repoDs.has(key)
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proc reserve*(self: RepoStore, bytes: uint): Future[?!void] {.async.} =
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## Reserve bytes
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##
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trace "Reserving bytes", reserved = self.quotaReservedBytes, bytes
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if (self.totalUsed + bytes) > self.quotaMaxBytes:
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trace "Not enough storage quota to reserver", reserve = self.totalUsed + bytes
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return failure(
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newException(QuotaNotEnoughError, "Not enough storage quota to reserver"))
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self.quotaReservedBytes += bytes
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if err =? (await self.metaDs.put(
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QuotaReservedKey,
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@(toBytesBE(self.quotaReservedBytes.uint64)))).errorOption:
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trace "Error reserving bytes", err = err.msg
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self.quotaReservedBytes += bytes
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return failure(err)
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return success()
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proc release*(self: RepoStore, bytes: uint): Future[?!void] {.async.} =
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## Release bytes
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##
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trace "Releasing bytes", reserved = self.quotaReservedBytes, bytes
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if (self.quotaReservedBytes.int - bytes.int) < 0:
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trace "Cannot release this many bytes",
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quotaReservedBytes = self.quotaReservedBytes, bytes
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return failure("Cannot release this many bytes")
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self.quotaReservedBytes -= bytes
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if err =? (await self.metaDs.put(
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QuotaReservedKey,
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@(toBytesBE(self.quotaReservedBytes.uint64)))).errorOption:
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trace "Error releasing bytes", err = err.msg
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self.quotaReservedBytes -= bytes
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return failure(err)
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trace "Released bytes", bytes
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return success()
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proc start*(self: RepoStore): Future[void] {.async.} =
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## Start repo
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##
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if self.started:
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trace "Repo already started"
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return
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trace "Starting repo"
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## load current persist and cache bytes from meta ds
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without quotaUsedBytes =? await self.metaDs.get(QuotaUsedKey), err:
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if not (err of DatastoreKeyNotFound):
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error "Error getting cache bytes from datastore",
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err = err.msg, key = $QuotaUsedKey
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raise newException(Defect, err.msg)
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if quotaUsedBytes.len > 0:
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self.quotaUsedBytes = uint64.fromBytesBE(quotaUsedBytes).uint
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notice "Current bytes used for cache quota", bytes = self.quotaUsedBytes
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without quotaReservedBytes =? await self.metaDs.get(QuotaReservedKey), err:
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if not (err of DatastoreKeyNotFound):
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error "Error getting persist bytes from datastore",
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err = err.msg, key = $QuotaReservedKey
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raise newException(Defect, err.msg)
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if quotaReservedBytes.len > 0:
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self.quotaReservedBytes = uint64.fromBytesBE(quotaReservedBytes).uint
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if self.quotaUsedBytes > self.quotaMaxBytes:
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raiseAssert "All storage quota used, increase storage quota!"
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notice "Current bytes used for persist quota", bytes = self.quotaReservedBytes
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self.started = true
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proc stop*(self: RepoStore): Future[void] {.async.} =
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## Stop repo
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##
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if not self.started:
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trace "Repo is not started"
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return
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trace "Stopping repo"
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(await self.repoDs.close()).expect("Should close repo store!")
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(await self.metaDs.close()).expect("Should close meta store!")
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self.started = false
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func new*(
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T: type RepoStore,
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repoDs: Datastore,
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metaDs: Datastore,
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clock: Clock = SystemClock.new(),
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postFixLen = 2,
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quotaMaxBytes = DefaultQuotaBytes,
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blockTtl = DefaultBlockTtl): T =
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T(
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repoDs: repoDs,
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metaDs: metaDs,
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clock: clock,
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postFixLen: postFixLen,
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quotaMaxBytes: quotaMaxBytes,
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blockTtl: blockTtl)
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