nimbus-eth1/fluffy/rpc/rpc_discovery_api.nim

122 lines
4.2 KiB
Nim

# Nimbus
# Copyright (c) 2021 Status Research & Development GmbH
# Licensed and distributed under either of
# * MIT license (license terms in the root directory or at https://opensource.org/licenses/MIT).
# * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
# at your option. This file may not be copied, modified, or distributed except according to those terms.
{.push raises: [Defect].}
import
std/sequtils,
json_rpc/[rpcproxy, rpcserver], stew/byteutils,
eth/p2p/discoveryv5/protocol as discv5_protocol,
./rpc_types
export rpc_types # tasty sandwich
type
PongResponse* = object
enrSeq: uint64
recipientIP: string
recipientPort: uint16
proc installDiscoveryApiHandlers*(rpcServer: RpcServer|RpcProxy,
d: discv5_protocol.Protocol) {.raises: [Defect, CatchableError].} =
## Discovery v5 JSON-RPC API such as defined here:
## https://ddht.readthedocs.io/en/latest/jsonrpc.html
## and here:
## https://github.com/ethereum/portal-network-specs/pull/88
## Note: There are quite some discrepancies between the two, can only
## implement exactly once specification has settled.
rpcServer.rpc("discv5_routingTableInfo") do() -> RoutingTableInfo:
return getRoutingTableInfo(d.routingTable)
rpcServer.rpc("discv5_nodeInfo") do() -> NodeInfo:
return d.routingTable.getNodeInfo()
rpcServer.rpc("discv5_updateNodeInfo") do(
kvPairs: seq[(string, string)]) -> NodeInfo:
let enrFields = kvPairs.map(
proc(n: (string, string)): (string, seq[byte]) =
(n[0], hexToSeqByte(n[1]))
)
let updated = d.updateRecord(enrFields)
if updated.isErr():
raise newException(ValueError, $updated.error)
return d.routingTable.getNodeInfo()
rpcServer.rpc("discv5_setEnr") do(enr: Record) -> bool:
if d.addNode(enr):
return true
else:
raise newException(ValueError, "Could not add node with this ENR to routing table")
rpcServer.rpc("discv5_getEnr") do(nodeId: NodeId) -> Record:
let node = d.getNode(nodeId)
if node.isSome():
return node.get().record
else:
raise newException(ValueError, "Record not in local routing table.")
rpcServer.rpc("discv5_deleteEnr") do(nodeId: NodeId) -> bool:
# TODO: Adjust `removeNode` to accept NodeId as param and to return bool.
let node = d.getNode(nodeId)
if node.isSome():
d.routingTable.removeNode(node.get())
return true
else:
raise newException(ValueError, "Record not in local routing table.")
rpcServer.rpc("discv5_lookupEnr") do(nodeId: NodeId) -> Record:
# TODO: Not using seqNum, what is the use case of this?
let lookup = await d.resolve(nodeId)
if lookup.isSome():
return lookup.get().record
else:
raise newException(ValueError, "Record not found in DHT lookup.")
rpcServer.rpc("discv5_ping") do(enr: Record) -> PongResponse:
let
node = toNodeWithAddress(enr)
pong = await d.ping(node)
if pong.isErr():
raise newException(ValueError, $pong.error)
else:
let p = pong.get()
return PongResponse(
enrSeq: p.enrSeq,
recipientIP: $p.ip,
recipientPort: p.port
)
rpcServer.rpc("discv5_findNode") do(
enr: Record, distances: seq[uint16]) -> seq[Record]:
let
node = toNodeWithAddress(enr)
nodes = await d.findNode(node, distances)
if nodes.isErr():
raise newException(ValueError, $nodes.error)
else:
return nodes.get().map(proc(n: Node): Record = n.record)
rpcServer.rpc("discv5_talkReq") do(enr: Record, protocol, payload: string) -> string:
let
node = toNodeWithAddress(enr)
talkresp = await d.talkreq(
node, hexToSeqByte(protocol), hexToSeqByte(payload))
if talkresp.isErr():
raise newException(ValueError, $talkresp.error)
else:
return talkresp.get().toHex()
rpcServer.rpc("discv5_recursiveFindNodes") do() -> seq[Record]:
# TODO: Not according to the specification currently as the node_id is a
# parameter to be passed, but in that case it would be very similar to
# discv5_lookupEnr.
let discovered = await d.lookup(NodeId.random(d.rng[]))
return discovered.map(proc(n: Node): Record = n.record)