nimbus-eth1/fluffy/rpc/rpc_discovery_api.nim

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# Nimbus
# Copyright (c) 2021-2022 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://github.com/ethereum/portal-network-specs/tree/master/jsonrpc
rpcServer.rpc("discv5_nodeInfo") do() -> NodeInfo:
return d.routingTable.getNodeInfo()
rpcServer.rpc("discv5_updateNodeInfo") do(
kvPairs: seq[(string, string)]) -> NodeInfo:
# TODO: Not according to spec, as spec parameters are weird.
# It is currently as in
# https://ddht.readthedocs.io/en/latest/jsonrpc.html#discv5-updatenodeinfo
let enrFields = kvPairs.map(
proc(n: (string, string)): (string, seq[byte]) {.raises: [ValueError].} =
(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_routingTableInfo") do() -> RoutingTableInfo:
return getRoutingTableInfo(d.routingTable)
rpcServer.rpc("discv5_addEnr") do(enr: Record) -> bool:
let nodeRes = newNode(enr)
if nodeRes.isOk():
let node = nodeRes.get()
let res = d.addNode(node)
d.routingTable.setJustSeen(node)
return res
else:
raise newException(ValueError, "Failed creating Node from ENR")
rpcServer.rpc("discv5_addEnrs") do(enrs: seq[Record]) -> bool:
# Note: unspecified RPC, but useful for our local testnet test
# TODO: We could also adjust the API of addNode & newNode to accept a seen
# parameter, but perhaps only if that makes sense on other locations in
# discv5/portal that are not testing/debug related.
for enr in enrs:
let nodeRes = newNode(enr)
if nodeRes.isOk():
let node = nodeRes.get()
discard d.addNode(node)
d.routingTable.setJustSeen(node)
return true
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 according to spec, missing optional enrSeq
# Can add `enrSeq: Option[uint64]` as parameter but Option appears to be
# not implemented as an option parameter in nim-json-rpc?
let lookup = await d.resolve(nodeId)
if lookup.isSome():
return lookup.get().record
else:
raise newException(ValueError, "Record not found in DHT lookup.")
# Note:
# These are difficult to support in our current discv5 implementation and it
# should be proven first that they are deemed useful before implementing them.
rpcServer.rpc("discv5_sendPing") do(enr: Record) -> string:
raise newException(ValueError, "This JSON-RPC is not supported")
rpcServer.rpc("discv5_sendPong") do(enr: Record, requestId: string) -> bool:
raise newException(ValueError, "This JSON-RPC is not supported")
rpcServer.rpc("discv5_sendFindNode") do(
enr: Record, distances: seq[uint16]) -> string:
raise newException(ValueError, "This JSON-RPC is not supported")
rpcServer.rpc("discv5_sendNodes") do(
enr: Record, nodes: seq[Record], requestId: string) -> uint8:
raise newException(ValueError, "This JSON-RPC is not supported")
rpcServer.rpc("discv5_sendTalkRequest") do(
enr: Record, protocolId: string, payload: string) -> string:
raise newException(ValueError, "This JSON-RPC is not supported")
rpcServer.rpc("discv5_sendTalkResponse") do(
enr: Record, payload: string, requestId: string) -> bool:
raise newException(ValueError, "This JSON-RPC is not supported")
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_recursiveFindNode") do(nodeId: NodeId) -> seq[Record]:
let discovered = await d.lookup(nodeId)
return discovered.map(proc(n: Node): Record = n.record)