nim-codex/codex/node.nim

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## Nim-Codex
## Copyright (c) 2021 Status Research & Development GmbH
## Licensed under either of
## * Apache License, version 2.0, ([LICENSE-APACHE](LICENSE-APACHE))
## * MIT license ([LICENSE-MIT](LICENSE-MIT))
## at your option.
## This file may not be copied, modified, or distributed except according to
## those terms.
import std/options
import std/tables
import std/sequtils
import std/strformat
import std/sugar
import pkg/questionable
import pkg/questionable/results
import pkg/chronicles
import pkg/chronos
import pkg/libp2p/[switch, multicodec, multihash]
import pkg/libp2p/stream/bufferstream
# TODO: remove once exported by libp2p
import pkg/libp2p/routing_record
import pkg/libp2p/signed_envelope
import ./chunker
import ./blocktype as bt
import ./manifest
import ./merkletree
import ./stores/blockstore
import ./blockexchange
import ./streams
import ./erasure
import ./discovery
import ./contracts
import ./node/batch
import ./utils
export batch
logScope:
topics = "codex node"
const
FetchBatch = 200
type
CodexError = object of CatchableError
Contracts* = tuple
client: ?ClientInteractions
host: ?HostInteractions
validator: ?ValidatorInteractions
CodexNodeRef* = ref object
switch*: Switch
networkId*: PeerId
blockStore*: BlockStore
engine*: BlockExcEngine
erasure*: Erasure
discovery*: Discovery
contracts*: Contracts
OnManifest* = proc(cid: Cid, manifest: Manifest): void {.gcsafe, closure.}
proc findPeer*(
node: CodexNodeRef,
peerId: PeerId): Future[?PeerRecord] {.async.} =
## Find peer using the discovery service from the given CodexNode
##
return await node.discovery.findPeer(peerId)
proc connect*(
node: CodexNodeRef,
peerId: PeerId,
addrs: seq[MultiAddress]
): Future[void] =
node.switch.connect(peerId, addrs)
proc fetchManifest*(
node: CodexNodeRef,
cid: Cid): Future[?!Manifest] {.async.} =
## Fetch and decode a manifest block
##
if err =? cid.isManifest.errorOption:
return failure "CID has invalid content type for manifest {$cid}"
trace "Retrieving manifest for cid", cid
without blk =? await node.blockStore.getBlock(BlockAddress.init(cid)), err:
trace "Error retrieve manifest block", cid, err = err.msg
return failure err
trace "Decoding manifest for cid", cid
without manifest =? Manifest.decode(blk), err:
trace "Unable to decode as manifest", err = err.msg
return failure("Unable to decode as manifest")
trace "Decoded manifest", cid
return manifest.success
proc fetchBatched*(
node: CodexNodeRef,
manifest: Manifest,
batchSize = FetchBatch,
onBatch: BatchProc = nil): Future[?!void] {.async, gcsafe.} =
## Fetch manifest in batches of `batchSize`
##
let batchCount = divUp(manifest.blocksCount, batchSize)
trace "Fetching blocks in batches of", size = batchSize
let iter = Iter.fromSlice(0..<manifest.blocksCount)
.map((i: int) => node.blockStore.getBlock(BlockAddress.init(manifest.treeCid, i)))
for batchNum in 0..<batchCount:
let blocks = collect:
for i in 0..<batchSize:
if not iter.finished:
iter.next()
try:
await allFuturesThrowing(allFinished(blocks))
if not onBatch.isNil:
await onBatch(blocks.mapIt( it.read.get ))
except CancelledError as exc:
raise exc
except CatchableError as exc:
return failure(exc.msg)
return success()
proc retrieve*(
node: CodexNodeRef,
cid: Cid): Future[?!LPStream] {.async.} =
## Retrieve by Cid a single block or an entire dataset described by manifest
##
if manifest =? (await node.fetchManifest(cid)):
trace "Retrieving blocks from manifest", cid
if manifest.protected:
# Retrieve, decode and save to the local store all EС groups
proc erasureJob(): Future[void] {.async.} =
try:
# Spawn an erasure decoding job
without res =? (await node.erasure.decode(manifest)), error:
trace "Unable to erasure decode manifest", cid, exc = error.msg
except CatchableError as exc:
trace "Exception decoding manifest", cid, exc = exc.msg
asyncSpawn erasureJob()
# Retrieve all blocks of the dataset sequentially from the local store or network
trace "Creating store stream for manifest", cid
LPStream(StoreStream.new(node.blockStore, manifest, pad = false)).success
else:
let
stream = BufferStream.new()
without blk =? (await node.blockStore.getBlock(BlockAddress.init(cid))), err:
return failure(err)
proc streamOneBlock(): Future[void] {.async.} =
try:
await stream.pushData(blk.data)
except CatchableError as exc:
trace "Unable to send block", cid, exc = exc.msg
discard
finally:
await stream.pushEof()
asyncSpawn streamOneBlock()
LPStream(stream).success()
proc store*(
self: CodexNodeRef,
stream: LPStream,
blockSize = DefaultBlockSize): Future[?!Cid] {.async.} =
## Save stream contents as dataset with given blockSize
## to nodes's BlockStore, and return Cid of its manifest
##
trace "Storing data"
let
hcodec = multiCodec("sha2-256")
dataCodec = multiCodec("raw")
chunker = LPStreamChunker.new(stream, chunkSize = blockSize)
var cids: seq[Cid]
try:
while (
let chunk = await chunker.getBytes();
chunk.len > 0):
trace "Got data from stream", len = chunk.len
without mhash =? MultiHash.digest($hcodec, chunk).mapFailure, err:
return failure(err)
without cid =? Cid.init(CIDv1, dataCodec, mhash).mapFailure, err:
return failure(err)
without blk =? bt.Block.new(cid, chunk, verify = false):
return failure("Unable to init block from chunk!")
cids.add(cid)
if err =? (await self.blockStore.putBlock(blk)).errorOption:
trace "Unable to store block", cid = blk.cid, err = err.msg
return failure(&"Unable to store block {blk.cid}")
except CancelledError as exc:
raise exc
except CatchableError as exc:
return failure(exc.msg)
finally:
await stream.close()
without tree =? MerkleTree.init(cids), err:
return failure(err)
without treeCid =? tree.rootCid(CIDv1, dataCodec), err:
return failure(err)
for index, cid in cids:
without proof =? tree.getProof(index), err:
return failure(err)
if err =? (await self.blockStore.putBlockCidAndProof(treeCid, index, cid, proof)).errorOption:
# TODO add log here
return failure(err)
let manifest = Manifest.new(
treeCid = treeCid,
blockSize = blockSize,
datasetSize = NBytes(chunker.offset),
version = CIDv1,
hcodec = hcodec,
codec = dataCodec
)
# Generate manifest
without data =? manifest.encode(), err:
return failure(
newException(CodexError, "Error encoding manifest: " & err.msg))
# Store as a dag-pb block
without manifestBlk =? bt.Block.new(data = data, codec = DagPBCodec):
trace "Unable to init block from manifest data!"
return failure("Unable to init block from manifest data!")
if isErr (await self.blockStore.putBlock(manifestBlk)):
trace "Unable to store manifest", cid = manifestBlk.cid
return failure("Unable to store manifest " & $manifestBlk.cid)
info "Stored data", manifestCid = manifestBlk.cid,
treeCid = treeCid,
blocks = manifest.blocksCount,
datasetSize = manifest.datasetSize
# Announce manifest
await self.discovery.provide(manifestBlk.cid)
await self.discovery.provide(treeCid)
return manifestBlk.cid.success
proc iterateManifests*(node: CodexNodeRef, onManifest: OnManifest) {.async.} =
without cids =? await node.blockStore.listBlocks(BlockType.Manifest):
warn "Failed to listBlocks"
return
for c in cids:
if cid =? await c:
without blk =? await node.blockStore.getBlock(cid):
warn "Failed to get manifest block by cid", cid
return
without manifest =? Manifest.decode(blk):
warn "Failed to decode manifest", cid
return
onManifest(cid, manifest)
proc requestStorage*(
self: CodexNodeRef,
cid: Cid,
duration: UInt256,
proofProbability: UInt256,
nodes: uint,
tolerance: uint,
reward: UInt256,
collateral: UInt256,
expiry = UInt256.none): Future[?!PurchaseId] {.async.} =
## Initiate a request for storage sequence, this might
## be a multistep procedure.
##
## Roughly the flow is as follows:
## - Get the original cid from the store (should have already been uploaded)
## - Erasure code it according to the nodes and tolerance parameters
## - Run the PoR setup on the erasure dataset
## - Call into the marketplace and purchasing contracts
##
trace "Received a request for storage!", cid, duration, nodes, tolerance, reward, proofProbability, collateral, expiry
without contracts =? self.contracts.client:
trace "Purchasing not available"
return failure "Purchasing not available"
without manifest =? await self.fetchManifest(cid), error:
trace "Unable to fetch manifest for cid", cid
raise error
# Erasure code the dataset according to provided parameters
without encoded =? (await self.erasure.encode(manifest, nodes.int, tolerance.int)), error:
trace "Unable to erasure code dataset", cid
return failure(error)
without encodedData =? encoded.encode(), error:
trace "Unable to encode protected manifest"
return failure(error)
without encodedBlk =? bt.Block.new(data = encodedData, codec = DagPBCodec), error:
trace "Unable to create block from encoded manifest"
return failure(error)
if isErr (await self.blockStore.putBlock(encodedBlk)):
trace "Unable to store encoded manifest block", cid = encodedBlk.cid
return failure("Unable to store encoded manifest block")
let request = StorageRequest(
ask: StorageAsk(
slots: nodes + tolerance,
# TODO: Specify slot-specific size (as below) once dispersal is
# implemented. The current implementation downloads the entire dataset, so
# it is currently set to be the size of the entire dataset. This is
# because the slotSize is used to determine the amount of bytes to reserve
# in a Reservations
# TODO: slotSize: (encoded.blockSize.int * encoded.steps).u256,
slotSize: (encoded.blockSize.int * encoded.blocksCount).u256,
duration: duration,
proofProbability: proofProbability,
reward: reward,
collateral: collateral,
maxSlotLoss: tolerance
),
content: StorageContent(
cid: $encodedBlk.cid,
erasure: StorageErasure(
totalChunks: encoded.blocksCount.uint64,
),
por: StoragePoR(
u: @[], # TODO: PoR setup
publicKey: @[], # TODO: PoR setup
name: @[] # TODO: PoR setup
)
),
expiry: expiry |? 0.u256
)
let purchase = await contracts.purchasing.purchase(request)
return success purchase.id
proc new*(
T: type CodexNodeRef,
switch: Switch,
store: BlockStore,
engine: BlockExcEngine,
erasure: Erasure,
discovery: Discovery,
contracts = Contracts.default): CodexNodeRef =
## Create new instance of a Codex node, call `start` to run it
##
CodexNodeRef(
switch: switch,
blockStore: store,
engine: engine,
erasure: erasure,
discovery: discovery,
contracts: contracts)
proc start*(node: CodexNodeRef) {.async.} =
if not node.engine.isNil:
await node.engine.start()
if not node.erasure.isNil:
await node.erasure.start()
if not node.discovery.isNil:
await node.discovery.start()
if hostContracts =? node.contracts.host:
# TODO: remove Sales callbacks, pass BlockStore and StorageProofs instead
hostContracts.sales.onStore = proc(request: StorageRequest,
slot: UInt256,
onBatch: BatchProc): Future[?!void] {.async.} =
## store data in local storage
##
without cid =? Cid.init(request.content.cid):
trace "Unable to parse Cid", cid
let error = newException(CodexError, "Unable to parse Cid")
return failure(error)
without manifest =? await node.fetchManifest(cid), error:
trace "Unable to fetch manifest for cid", cid
return failure(error)
trace "Fetching block for manifest", cid
# TODO: This will probably require a call to `getBlock` either way,
# since fetching of blocks will have to be selective according
# to a combination of parameters, such as node slot position
# and dataset geometry
if fetchErr =? (await node.fetchBatched(manifest, onBatch = onBatch)).errorOption:
let error = newException(CodexError, "Unable to retrieve blocks")
error.parent = fetchErr
return failure(error)
return success()
hostContracts.sales.onClear = proc(request: StorageRequest,
slotIndex: UInt256) =
# TODO: remove data from local storage
discard
hostContracts.sales.onProve = proc(slot: Slot): Future[seq[byte]] {.async.} =
# TODO: generate proof
return @[42'u8]
try:
await hostContracts.start()
except CatchableError as error:
error "Unable to start host contract interactions: ", error=error.msg
node.contracts.host = HostInteractions.none
if clientContracts =? node.contracts.client:
try:
await clientContracts.start()
except CatchableError as error:
error "Unable to start client contract interactions: ", error=error.msg
node.contracts.client = ClientInteractions.none
if validatorContracts =? node.contracts.validator:
try:
await validatorContracts.start()
except CatchableError as error:
error "Unable to start validator contract interactions: ", error=error.msg
node.contracts.validator = ValidatorInteractions.none
node.networkId = node.switch.peerInfo.peerId
notice "Started codex node", id = $node.networkId, addrs = node.switch.peerInfo.addrs
proc stop*(node: CodexNodeRef) {.async.} =
trace "Stopping node"
if not node.engine.isNil:
await node.engine.stop()
if not node.erasure.isNil:
await node.erasure.stop()
if not node.discovery.isNil:
await node.discovery.stop()
if clientContracts =? node.contracts.client:
await clientContracts.stop()
if hostContracts =? node.contracts.host:
await hostContracts.stop()
if validatorContracts =? node.contracts.validator:
await validatorContracts.stop()
if not node.blockStore.isNil:
await node.blockStore.close