397 lines
12 KiB
Nim
397 lines
12 KiB
Nim
## Nim-Codex
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## Copyright (c) 2021 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 std/options
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import std/tables
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import std/sequtils
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import std/strformat
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import pkg/questionable
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import pkg/questionable/results
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import pkg/chronicles
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import pkg/chronos
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import pkg/libp2p
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# TODO: remove once exported by libp2p
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import pkg/libp2p/routing_record
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import pkg/libp2p/signed_envelope
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import ./chunker
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import ./blocktype as bt
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import ./manifest
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import ./stores/blockstore
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import ./blockexchange
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import ./streams
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import ./erasure
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import ./discovery
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import ./contracts
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logScope:
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topics = "codex node"
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const
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FetchBatch = 200
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type
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BatchProc* = proc(blocks: seq[bt.Block]): Future[void] {.gcsafe, raises: [Defect].}
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CodexError = object of CatchableError
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CodexNodeRef* = ref object
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switch*: Switch
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networkId*: PeerID
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blockStore*: BlockStore
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engine*: BlockExcEngine
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erasure*: Erasure
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discovery*: Discovery
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contracts*: ?ContractInteractions
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proc findPeer*(
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node: CodexNodeRef,
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peerId: PeerID): Future[?PeerRecord] {.async.} =
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return await node.discovery.findPeer(peerId)
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proc connect*(
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node: CodexNodeRef,
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peerId: PeerID,
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addrs: seq[MultiAddress]): Future[void] =
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node.switch.connect(peerId, addrs)
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proc fetchManifest*(
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node: CodexNodeRef,
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cid: Cid): Future[?!Manifest] {.async.} =
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## Fetch and decode a manifest block
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##
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if err =? cid.isManifest.errorOption:
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return failure "CID has invalid content type for manifest {$cid}"
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trace "Received manifest retrieval request", cid
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without blk =? await node.blockStore.getBlock(cid), err:
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trace "Error retriving manifest block", cid, err = err.msg
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return failure err
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without manifest =? Manifest.decode(blk), err:
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trace "Unable to decode as manifest", err = err.msg
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return failure("Unable to decode as manifest")
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trace "Decoded manifest", cid
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return manifest.success
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proc fetchBatched*(
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node: CodexNodeRef,
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manifest: Manifest,
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batchSize = FetchBatch,
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onBatch: BatchProc = nil): Future[?!void] {.async, gcsafe.} =
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## Fetch manifest in batches of `batchSize`
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##
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let
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batches =
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(manifest.blocks.len div batchSize) +
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(manifest.blocks.len mod batchSize)
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trace "Fetching blocks in batches of", size = batchSize
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for blks in manifest.blocks.distribute(max(1, batches), true):
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try:
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let
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blocks = blks.mapIt(node.blockStore.getBlock( it ))
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await allFuturesThrowing(allFinished(blocks))
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if not onBatch.isNil:
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await onBatch(blocks.mapIt( it.read.get ))
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except CancelledError as exc:
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raise exc
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except CatchableError as exc:
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return failure(exc.msg)
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return success()
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proc retrieve*(
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node: CodexNodeRef,
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cid: Cid): Future[?!LPStream] {.async.} =
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## Retrieve by Cid a single block or an entire dataset described by manifest
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##
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if manifest =? (await node.fetchManifest(cid)):
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trace "Retrieving blocks from manifest", cid
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if manifest.protected:
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# Retrieve, decode and save to the local store all EС groups
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proc erasureJob(): Future[void] {.async.} =
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try:
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# Spawn an erasure decoding job
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without res =? (await node.erasure.decode(manifest)), error:
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trace "Unable to erasure decode manifest", cid, exc = error.msg
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except CatchableError as exc:
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trace "Exception decoding manifest", cid
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#
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asyncSpawn erasureJob()
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else:
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# Prefetch the entire dataset into the local store
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proc prefetchBlocks() {.async, raises: [Defect].} =
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try:
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discard await node.fetchBatched(manifest)
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except CatchableError as exc:
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trace "Exception prefetching blocks", exc = exc.msg
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#
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# asyncSpawn prefetchBlocks() - temporarily commented out
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#
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# Retrieve all blocks of the dataset sequentially from the local store or network
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trace "Creating store stream for manifest", cid
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return LPStream(StoreStream.new(node.blockStore, manifest, pad = false)).success
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let
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stream = BufferStream.new()
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without blk =? (await node.blockStore.getBlock(cid)), err:
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return failure(err)
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proc streamOneBlock(): Future[void] {.async.} =
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try:
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await stream.pushData(blk.data)
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except CatchableError as exc:
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trace "Unable to send block", cid
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discard
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finally:
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await stream.pushEof()
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asyncSpawn streamOneBlock()
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return LPStream(stream).success()
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return failure("Unable to retrieve Cid!")
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proc store*(
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self: CodexNodeRef,
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stream: LPStream,
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blockSize = BlockSize): Future[?!Cid] {.async.} =
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## Save stream contents as dataset with given blockSize
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## to nodes's BlockStore, and return Cid of its manifest
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##
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trace "Storing data"
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without var blockManifest =? Manifest.new(blockSize = blockSize):
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return failure("Unable to create Block Set")
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# Manifest and chunker should use the same blockSize
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let chunker = LPStreamChunker.new(stream, chunkSize = blockSize)
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try:
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while (
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let chunk = await chunker.getBytes();
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chunk.len > 0):
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trace "Got data from stream", len = chunk.len
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without blk =? bt.Block.new(chunk):
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return failure("Unable to init block from chunk!")
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blockManifest.add(blk.cid)
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if err =? (await self.blockStore.putBlock(blk)).errorOption:
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trace "Unable to store block", cid = blk.cid, err = err.msg
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return failure(&"Unable to store block {blk.cid}")
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except CancelledError as exc:
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raise exc
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except CatchableError as exc:
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return failure(exc.msg)
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finally:
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await stream.close()
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# Generate manifest
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blockManifest.originalBytes = chunker.offset # store the exact file size
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without data =? blockManifest.encode():
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return failure(
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newException(CodexError, "Could not generate dataset manifest!"))
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# Store as a dag-pb block
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without manifest =? bt.Block.new(data = data, codec = DagPBCodec):
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trace "Unable to init block from manifest data!"
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return failure("Unable to init block from manifest data!")
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if isErr (await self.blockStore.putBlock(manifest)):
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trace "Unable to store manifest", cid = manifest.cid
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return failure("Unable to store manifest " & $manifest.cid)
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without cid =? blockManifest.cid, error:
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trace "Unable to generate manifest Cid!", exc = error.msg
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return failure(error.msg)
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trace "Stored data", manifestCid = manifest.cid,
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contentCid = cid,
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blocks = blockManifest.len
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# Announce manifest
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await self.discovery.provide(manifest.cid)
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return manifest.cid.success
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proc requestStorage*(self: CodexNodeRef,
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cid: Cid,
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duration: UInt256,
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nodes: uint,
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tolerance: uint,
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reward: UInt256,
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expiry = UInt256.none): Future[?!PurchaseId] {.async.} =
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## Initiate a request for storage sequence, this might
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## be a multistep procedure.
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##
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## Roughly the flow is as follows:
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## - Get the original cid from the store (should have already been uploaded)
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## - Erasure code it according to the nodes and tolerance parameters
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## - Run the PoR setup on the erasure dataset
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## - Call into the marketplace and purchasing contracts
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##
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trace "Received a request for storage!", cid, duration, nodes, tolerance, reward
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without contracts =? self.contracts:
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trace "Purchasing not available"
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return failure "Purchasing not available"
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without manifest =? await self.fetchManifest(cid), error:
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trace "Unable to fetch manifest for cid", cid
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raise error
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# Erasure code the dataset according to provided parameters
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without encoded =? (await self.erasure.encode(manifest, nodes.int, tolerance.int)), error:
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trace "Unable to erasure code dataset", cid
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return failure(error)
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without encodedData =? encoded.encode(), error:
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trace "Unable to encode protected manifest"
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return failure(error)
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without encodedBlk =? bt.Block.new(data = encodedData, codec = DagPBCodec), error:
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trace "Unable to create block from encoded manifest"
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return failure(error)
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if isErr (await self.blockStore.putBlock(encodedBlk)):
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trace "Unable to store encoded manifest block", cid = encodedBlk.cid
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return failure("Unable to store encoded manifest block")
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let request = StorageRequest(
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ask: StorageAsk(
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slots: nodes + tolerance,
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slotSize: (encoded.blockSize * encoded.steps).u256,
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duration: duration,
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reward: reward,
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maxSlotLoss: tolerance
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),
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content: StorageContent(
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cid: $encodedBlk.cid,
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erasure: StorageErasure(
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totalChunks: encoded.len.uint64,
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),
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por: StoragePor(
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u: @[], # TODO: PoR setup
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publicKey: @[], # TODO: PoR setup
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name: @[] # TODO: PoR setup
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)
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),
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expiry: expiry |? 0.u256
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)
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let purchase = await contracts.purchasing.purchase(request)
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return success purchase.id
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proc new*(
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T: type CodexNodeRef,
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switch: Switch,
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store: BlockStore,
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engine: BlockExcEngine,
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erasure: Erasure,
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discovery: Discovery,
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contracts = ContractInteractions.none): T =
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T(
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switch: switch,
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blockStore: store,
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engine: engine,
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erasure: erasure,
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discovery: discovery,
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contracts: contracts)
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proc start*(node: CodexNodeRef) {.async.} =
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if not node.switch.isNil:
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await node.switch.start()
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if not node.engine.isNil:
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await node.engine.start()
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if not node.erasure.isNil:
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await node.erasure.start()
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if not node.discovery.isNil:
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await node.discovery.start()
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if contracts =? node.contracts:
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# TODO: remove Sales callbacks, pass BlockStore and StorageProofs instead
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contracts.sales.onStore = proc(request: StorageRequest,
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slot: UInt256,
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availability: Availability) {.async.} =
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## store data in local storage
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##
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without cid =? Cid.init(request.content.cid):
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trace "Unable to parse Cid", cid
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raise newException(CodexError, "Unable to parse Cid")
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without manifest =? await node.fetchManifest(cid), error:
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trace "Unable to fetch manifest for cid", cid
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raise error
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trace "Fetching block for manifest", cid
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# TODO: This will probably require a call to `getBlock` either way,
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# since fetching of blocks will have to be selective according
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# to a combination of parameters, such as node slot position
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# and dataset geometry
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let fetchRes = await node.fetchBatched(manifest)
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if fetchRes.isErr:
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raise newException(CodexError, "Unable to retrieve blocks")
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contracts.sales.onClear = proc(availability: Availability,
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request: StorageRequest,
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slotIndex: UInt256) =
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# TODO: remove data from local storage
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discard
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contracts.sales.onProve = proc(request: StorageRequest,
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slot: UInt256): Future[seq[byte]] {.async.} =
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# TODO: generate proof
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return @[42'u8]
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try:
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await contracts.start()
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except CatchableError as error:
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error "Unable to start contract interactions: ", error=error.msg
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node.contracts = ContractInteractions.none
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node.networkId = node.switch.peerInfo.peerId
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notice "Started codex node", id = $node.networkId, addrs = node.switch.peerInfo.addrs
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proc stop*(node: CodexNodeRef) {.async.} =
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trace "Stopping node"
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if not node.engine.isNil:
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await node.engine.stop()
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if not node.switch.isNil:
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await node.switch.stop()
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if not node.erasure.isNil:
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await node.erasure.stop()
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if not node.discovery.isNil:
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await node.discovery.stop()
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if contracts =? node.contracts:
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await contracts.stop()
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if not node.blockStore.isNil:
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await node.blockStore.close
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