nimbus-eth2/beacon_chain/request_manager.nim

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import
options, random,
chronos, chronicles,
spec/datatypes,
eth2_network, beacon_node_types, sync_protocol,
eth/async_utils
type
RequestManager* = object
network*: Eth2Node
proc init*(T: type RequestManager, network: Eth2Node): T =
T(network: network)
type
FetchAncestorsResponseHandler = proc (b: BeaconBlock) {.gcsafe.}
proc fetchAncestorBlocksFromPeer(
peer: Peer,
rec: FetchRecord,
responseHandler: FetchAncestorsResponseHandler) {.async.} =
# TODO: It's not clear if this function follows the intention of the
# FetchRecord data type. Perhaps it is supposed to get a range of blocks
# instead. In order to do this, we'll need the slot number of the known
# block to be stored in the FetchRecord, so we can ask for a range of
# blocks starting N positions before this slot number.
try:
let blocks = await peer.beaconBlocksByRoot([rec.root])
if blocks.isSome:
for b in blocks.get:
responseHandler(b)
except CatchableError as err:
debug "Error while fetching ancestor blocks",
err = err.msg, root = rec.root, peer
proc fetchAncestorBlocks*(requestManager: RequestManager,
roots: seq[FetchRecord],
responseHandler: FetchAncestorsResponseHandler) =
# TODO: we could have some fancier logic here:
#
# * Keeps track of what was requested
# (this would give a little bit of time for the asked peer to respond)
#
# * Keep track of the average latency of each peer
# (we can give priority to peers with better latency)
#
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const ParallelRequests = 2
var fetchComplete = false
for peer in requestManager.network.randomPeers(ParallelRequests, BeaconSync):
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traceAsyncErrors peer.fetchAncestorBlocksFromPeer(roots.sample(), responseHandler)