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10a3946194
* Rename FindNode to FindNodes as per spec * Use consistently lower case starting camelCase for consts Style guide nep1 allows for both CamelCase and camelCase for consts, but we seem to use more often camelCase. Using this now consistently. * Change some procs to func
73 lines
2.5 KiB
Nim
73 lines
2.5 KiB
Nim
# Nimbus
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# Copyright (c) 2021 Status Research & Development GmbH
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# Licensed and distributed under either of
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# * MIT license (license terms in the root directory or at https://opensource.org/licenses/MIT).
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# * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
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# at your option. This file may not be copied, modified, or distributed except according to those terms.
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import
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std/[options, sugar],
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stew/results, chronos,
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eth/p2p/discoveryv5/[protocol, node, enr],
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../../content_db,
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../wire/portal_protocol,
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./history_content
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const
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historyProtocolId* = [byte 0x50, 0x0B]
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# TODO: Extract common parts from the different networks
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type HistoryNetwork* = ref object
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portalProtocol*: PortalProtocol
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contentDB*: ContentDB
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proc getHandler(contentDB: ContentDB): ContentHandler =
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return (proc (contentKey: history_content.ByteList): ContentResult =
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let contentId = toContentId(contentKey)
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let maybeContent = contentDB.get(contentId)
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if (maybeContent.isSome()):
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ContentResult(kind: ContentFound, content: maybeContent.unsafeGet())
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else:
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ContentResult(kind: ContentMissing, contentId: contentId))
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proc getContent*(n: HistoryNetwork, key: ContentKey):
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Future[Option[seq[byte]]] {.async.} =
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let
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keyEncoded = encode(key)
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contentId = toContentId(keyEncoded)
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let nodeId = n.portalProtocol.localNode.id
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let distance = n.portalProtocol.routingTable.distance(nodeId, contentId)
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let inRange = distance <= n.portalProtocol.dataRadius
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# When the content id is in our radius range, try to look it up in our db.
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if inRange:
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let contentFromDB = n.contentDB.get(contentId)
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if contentFromDB.isSome():
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return contentFromDB
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let content = await n.portalProtocol.contentLookup(keyEncoded, contentId)
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if content.isSome() and inRange:
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n.contentDB.put(contentId, content.get().asSeq())
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# TODO: for now returning bytes, ultimately it would be nice to return proper
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# domain types.
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return content.map(x => x.asSeq())
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proc new*(T: type HistoryNetwork, baseProtocol: protocol.Protocol,
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contentDB: ContentDB , dataRadius = UInt256.high(),
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bootstrapRecords: openarray[Record] = []): T =
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let portalProtocol = PortalProtocol.new(
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baseProtocol, historyProtocolId, getHandler(contentDB), dataRadius,
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bootstrapRecords)
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return HistoryNetwork(portalProtocol: portalProtocol, contentDB: contentDB)
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proc start*(p: HistoryNetwork) =
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p.portalProtocol.start()
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proc stop*(p: HistoryNetwork) =
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p.portalProtocol.stop()
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