667 lines
19 KiB
Nim
667 lines
19 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/chronos/futures
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import pkg/libp2p/[cid, multicodec, multihash]
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import pkg/lrucache
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import pkg/metrics
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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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import ../logutils
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import ../merkletree
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import ../utils
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export blocktype, cid
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logScope:
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topics = "codex repostore"
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declareGauge(codex_repostore_blocks, "codex repostore blocks")
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declareGauge(codex_repostore_bytes_used, "codex repostore bytes used")
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declareGauge(codex_repostore_bytes_reserved, "codex repostore bytes reserved")
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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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totalBlocks*: uint # number of blocks in the store
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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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proc updateMetrics(self: RepoStore) =
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codex_repostore_blocks.set(self.totalBlocks.int64)
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codex_repostore_bytes_used.set(self.quotaUsedBytes.int64)
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codex_repostore_bytes_reserved.set(self.quotaReservedBytes.int64)
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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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proc encode(cidAndProof: (Cid, MerkleProof)): seq[byte] =
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## Encodes a tuple of cid and merkle proof in a following format:
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## | 8-bytes | n-bytes | remaining bytes |
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## | n | cid | proof |
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##
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## where n is a size of cid
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##
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let
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(cid, proof) = cidAndProof
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cidBytes = cid.data.buffer
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proofBytes = proof.encode
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n = cidBytes.len
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nBytes = n.uint64.toBytesBE
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@nBytes & cidBytes & proofBytes
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proc decode(_: type (Cid, MerkleProof), data: seq[byte]): ?!(Cid, MerkleProof) =
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let
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n = uint64.fromBytesBE(data[0..<sizeof(uint64)]).int
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cid = ? Cid.init(data[sizeof(uint64)..<sizeof(uint64) + n]).mapFailure
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proof = ? MerkleProof.decode(data[sizeof(uint64) + n..^1])
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success((cid, proof))
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proc decodeCid(_: type (Cid, MerkleProof), data: seq[byte]): ?!Cid =
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let
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n = uint64.fromBytesBE(data[0..<sizeof(uint64)]).int
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cid = ? Cid.init(data[sizeof(uint64)..<sizeof(uint64) + n]).mapFailure
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success(cid)
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method putBlockCidAndProof*(
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self: RepoStore,
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treeCid: Cid,
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index: Natural,
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blockCid: Cid,
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proof: MerkleProof
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): Future[?!void] {.async.} =
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## Put a block to the blockstore
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##
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without key =? createBlockCidAndProofMetadataKey(treeCid, index), err:
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return failure(err)
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let value = (blockCid, proof).encode()
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await self.metaDs.put(key, value)
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proc getCidAndProof(
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self: RepoStore,
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treeCid: Cid,
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index: Natural
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): Future[?!(Cid, MerkleProof)] {.async.} =
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without key =? createBlockCidAndProofMetadataKey(treeCid, index), err:
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return failure(err)
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without value =? await self.metaDs.get(key), err:
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if err of DatastoreKeyNotFound:
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return failure(newException(BlockNotFoundError, err.msg))
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else:
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return failure(err)
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return (Cid, MerkleProof).decode(value)
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proc getCid(
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self: RepoStore,
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treeCid: Cid,
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index: Natural
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): Future[?!Cid] {.async.} =
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without key =? createBlockCidAndProofMetadataKey(treeCid, index), err:
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return failure(err)
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without value =? await self.metaDs.get(key), err:
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if err of DatastoreKeyNotFound:
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return failure(newException(BlockNotFoundError, err.msg))
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else:
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return failure(err)
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return (Cid, MerkleProof).decodeCid(value)
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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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logScope:
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cid = cid
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if cid.isEmpty:
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trace "Empty block, ignoring"
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return cid.emptyBlock
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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, verify = true)
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method getBlockAndProof*(self: RepoStore, treeCid: Cid, index: Natural): Future[?!(Block, MerkleProof)] {.async.} =
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without cidAndProof =? await self.getCidAndProof(treeCid, index), err:
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return failure(err)
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let (cid, proof) = cidAndProof
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without blk =? await self.getBlock(cid), err:
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return failure(err)
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success((blk, proof))
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method getBlock*(self: RepoStore, treeCid: Cid, index: Natural): Future[?!Block] {.async.} =
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without cid =? await self.getCid(treeCid, index), err:
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return failure(err)
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await self.getBlock(cid)
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method getBlock*(self: RepoStore, address: BlockAddress): Future[?!Block] =
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## Get a block from the blockstore
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##
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if address.leaf:
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self.getBlock(address.treeCid, address.index)
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else:
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self.getBlock(address.cid)
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proc getBlockExpirationEntry(
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self: RepoStore,
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cid: Cid,
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ttl: SecondsSince1970): ?!BatchEntry =
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## Get an expiration entry for a batch with timestamp
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##
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without key =? createBlockExpirationMetadataKey(cid), err:
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return failure(err)
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return success((key, ttl.toBytes))
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proc getBlockExpirationEntry(
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self: RepoStore,
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cid: Cid,
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ttl: ?Duration): ?!BatchEntry =
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## Get an expiration entry for a batch for duration since "now"
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##
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let duration = ttl |? self.blockTtl
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self.getBlockExpirationEntry(cid, self.clock.now() + duration.seconds)
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method ensureExpiry*(
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self: RepoStore,
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cid: Cid,
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expiry: SecondsSince1970
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): Future[?!void] {.async.} =
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## Ensure that block's assosicated expiry is at least given timestamp
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## If the current expiry is lower then it is updated to the given one, otherwise it is left intact
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##
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logScope:
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cid = cid
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if expiry <= 0:
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return failure(newException(ValueError, "Expiry timestamp must be larger then zero"))
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without expiryKey =? createBlockExpirationMetadataKey(cid), err:
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return failure(err)
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without currentExpiry =? await self.metaDs.get(expiryKey), err:
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if err of DatastoreKeyNotFound:
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error "No current expiry exists for the block"
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return failure(newException(BlockNotFoundError, err.msg))
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else:
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error "Could not read datastore key", err = err.msg
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return failure(err)
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if expiry <= currentExpiry.toSecondsSince1970:
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trace "Current expiry is larger than or equal to the specified one, no action needed", current = currentExpiry.toSecondsSince1970, ensuring = expiry
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return success()
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if err =? (await self.metaDs.put(expiryKey, expiry.toBytes)).errorOption:
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trace "Error updating expiration metadata entry", err = err.msg
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return failure(err)
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return success()
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method ensureExpiry*(
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self: RepoStore,
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treeCid: Cid,
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index: Natural,
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expiry: SecondsSince1970
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): Future[?!void] {.async.} =
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## Ensure that block's associated expiry is at least given timestamp
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## If the current expiry is lower then it is updated to the given one, otherwise it is left intact
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##
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without cidAndProof =? await self.getCidAndProof(treeCid, index), err:
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return failure(err)
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await self.ensureExpiry(cidAndProof[0], expiry)
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proc persistTotalBlocksCount(self: RepoStore): Future[?!void] {.async.} =
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if err =? (await self.metaDs.put(
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CodexTotalBlocksKey,
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@(self.totalBlocks.uint64.toBytesBE))).errorOption:
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trace "Error total blocks key!", err = err.msg
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return failure(err)
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return success()
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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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logScope:
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cid = blk.cid
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if blk.isEmpty:
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trace "Empty block, ignoring"
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return success()
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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(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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inc self.totalBlocks
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if isErr (await self.persistTotalBlocksCount()):
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trace "Unable to update block total metadata"
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return failure("Unable to update block total metadata")
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self.updateMetrics()
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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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self.updateMetrics()
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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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logScope:
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cid = cid
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trace "Deleting block"
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if cid.isEmpty:
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trace "Empty block, ignoring"
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return success()
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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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dec self.totalBlocks
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if isErr (await self.persistTotalBlocksCount()):
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trace "Unable to update block total metadata"
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return failure("Unable to update block total metadata")
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self.updateMetrics()
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return success()
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method delBlock*(self: RepoStore, treeCid: Cid, index: Natural): Future[?!void] {.async.} =
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without key =? createBlockCidAndProofMetadataKey(treeCid, index), err:
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return failure(err)
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without value =? await self.metaDs.get(key), err:
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if err of DatastoreKeyNotFound:
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return success()
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else:
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return failure(err)
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without cid =? (Cid, MerkleProof).decodeCid(value), err:
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return failure(err)
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if err =? (await self.delBlock(cid)).errorOption:
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return failure(err)
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await self.metaDs.delete(key)
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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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logScope:
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cid = cid
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if cid.isEmpty:
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trace "Empty block, ignoring"
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return success true
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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 hasBlock*(self: RepoStore, treeCid: Cid, index: Natural): Future[?!bool] {.async.} =
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without cid =? await self.getCid(treeCid, index), err:
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if err of BlockNotFoundError:
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return success(false)
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else:
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return failure(err)
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await self.hasBlock(cid)
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method listBlocks*(
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self: RepoStore,
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blockType = BlockType.Manifest
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): Future[?!AsyncIter[?Cid]] {.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 = AsyncIter[?Cid]()
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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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let query = Query.init(key, value=false)
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without queryIter =? (await self.repoDs.query(query)), 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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if queryIter.finished:
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iter.finish
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else:
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if pair =? (await queryIter.next()) and cid =? pair.key:
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doAssert pair.data.len == 0
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trace "Retrieved record from repo", cid
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return Cid.init(cid.value).option
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else:
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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*(
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self: RepoStore,
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maxNumber: int,
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offset: int): Future[?!AsyncIter[?BlockExpiration]] {.async, base.} =
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## Get block expirations from the given RepoStore
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##
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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 = AsyncIter[?BlockExpiration]()
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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.finish
|
|
return BlockExpiration.none
|
|
|
|
iter.next = next
|
|
return success iter
|
|
|
|
method close*(self: RepoStore): Future[void] {.async.} =
|
|
## Close the blockstore, cleaning up resources managed by it.
|
|
## For some implementations this may be a no-op
|
|
##
|
|
|
|
(await self.repoDs.close()).expect("Should close datastore")
|
|
|
|
proc reserve*(self: RepoStore, bytes: uint): Future[?!void] {.async.} =
|
|
## Reserve bytes
|
|
##
|
|
|
|
trace "Reserving bytes", reserved = self.quotaReservedBytes, bytes
|
|
|
|
if (self.totalUsed + bytes) > self.quotaMaxBytes:
|
|
trace "Not enough storage quota to reserver", reserve = self.totalUsed + bytes
|
|
return failure(
|
|
newException(QuotaNotEnoughError, "Not enough storage quota to reserver"))
|
|
|
|
self.quotaReservedBytes += bytes
|
|
if err =? (await self.metaDs.put(
|
|
QuotaReservedKey,
|
|
@(toBytesBE(self.quotaReservedBytes.uint64)))).errorOption:
|
|
|
|
trace "Error reserving bytes", err = err.msg
|
|
|
|
self.quotaReservedBytes += bytes
|
|
return failure(err)
|
|
|
|
return success()
|
|
|
|
proc release*(self: RepoStore, bytes: uint): Future[?!void] {.async.} =
|
|
## Release bytes
|
|
##
|
|
|
|
trace "Releasing bytes", reserved = self.quotaReservedBytes, bytes
|
|
|
|
if (self.quotaReservedBytes.int - bytes.int) < 0:
|
|
trace "Cannot release this many bytes",
|
|
quotaReservedBytes = self.quotaReservedBytes, bytes
|
|
|
|
return failure("Cannot release this many bytes")
|
|
|
|
self.quotaReservedBytes -= bytes
|
|
if err =? (await self.metaDs.put(
|
|
QuotaReservedKey,
|
|
@(toBytesBE(self.quotaReservedBytes.uint64)))).errorOption:
|
|
|
|
trace "Error releasing bytes", err = err.msg
|
|
|
|
self.quotaReservedBytes -= bytes
|
|
|
|
return failure(err)
|
|
|
|
trace "Released bytes", bytes
|
|
self.updateMetrics()
|
|
return success()
|
|
|
|
proc start*(self: RepoStore): Future[void] {.async.} =
|
|
## Start repo
|
|
##
|
|
|
|
if self.started:
|
|
trace "Repo already started"
|
|
return
|
|
|
|
trace "Starting repo"
|
|
|
|
without total =? await self.metaDs.get(CodexTotalBlocksKey), err:
|
|
if not (err of DatastoreKeyNotFound):
|
|
error "Unable to read total number of blocks from metadata store", err = err.msg, key = $CodexTotalBlocksKey
|
|
|
|
if total.len > 0:
|
|
self.totalBlocks = uint64.fromBytesBE(total).uint
|
|
trace "Number of blocks in store at start", total = self.totalBlocks
|
|
|
|
## load current persist and cache bytes from meta ds
|
|
without quotaUsedBytes =? await self.metaDs.get(QuotaUsedKey), err:
|
|
if not (err of DatastoreKeyNotFound):
|
|
error "Error getting cache bytes from datastore",
|
|
err = err.msg, key = $QuotaUsedKey
|
|
|
|
raise newException(Defect, err.msg)
|
|
|
|
if quotaUsedBytes.len > 0:
|
|
self.quotaUsedBytes = uint64.fromBytesBE(quotaUsedBytes).uint
|
|
|
|
notice "Current bytes used for cache quota", bytes = self.quotaUsedBytes
|
|
|
|
without quotaReservedBytes =? await self.metaDs.get(QuotaReservedKey), err:
|
|
if not (err of DatastoreKeyNotFound):
|
|
error "Error getting persist bytes from datastore",
|
|
err = err.msg, key = $QuotaReservedKey
|
|
|
|
raise newException(Defect, err.msg)
|
|
|
|
if quotaReservedBytes.len > 0:
|
|
self.quotaReservedBytes = uint64.fromBytesBE(quotaReservedBytes).uint
|
|
|
|
if self.quotaUsedBytes > self.quotaMaxBytes:
|
|
raiseAssert "All storage quota used, increase storage quota!"
|
|
|
|
notice "Current bytes used for persist quota", bytes = self.quotaReservedBytes
|
|
|
|
self.updateMetrics()
|
|
self.started = true
|
|
|
|
proc stop*(self: RepoStore): Future[void] {.async.} =
|
|
## Stop repo
|
|
##
|
|
if not self.started:
|
|
trace "Repo is not started"
|
|
return
|
|
|
|
trace "Stopping repo"
|
|
(await self.repoDs.close()).expect("Should close repo store!")
|
|
(await self.metaDs.close()).expect("Should close meta store!")
|
|
|
|
self.started = false
|
|
|
|
func new*(
|
|
T: type RepoStore,
|
|
repoDs: Datastore,
|
|
metaDs: Datastore,
|
|
clock: Clock = SystemClock.new(),
|
|
postFixLen = 2,
|
|
quotaMaxBytes = DefaultQuotaBytes,
|
|
blockTtl = DefaultBlockTtl
|
|
): RepoStore =
|
|
## Create new instance of a RepoStore
|
|
##
|
|
RepoStore(
|
|
repoDs: repoDs,
|
|
metaDs: metaDs,
|
|
clock: clock,
|
|
postFixLen: postFixLen,
|
|
quotaMaxBytes: quotaMaxBytes,
|
|
blockTtl: blockTtl
|
|
)
|