mirror of https://github.com/status-im/nim-eth.git
60 lines
1.9 KiB
Nim
60 lines
1.9 KiB
Nim
import
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std/net,
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eth/trie/db, types, ../enode
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type
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DiscoveryDB* = ref object of Database
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backend: TrieDatabaseRef
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DbKeyKind = enum
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kNodeToKeys = 100
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proc init*(T: type DiscoveryDB, backend: TrieDatabaseRef): DiscoveryDB =
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T(backend: backend)
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const keySize = 1 + # unique triedb prefix (kNodeToKeys)
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sizeof(NodeId) +
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16 + # max size of ip address (ipv6)
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2 # Sizeof port
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proc makeKey(id: NodeId, address: Address): array[keySize, byte] =
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result[0] = byte(kNodeToKeys)
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copyMem(addr result[1], unsafeAddr id, sizeof(id))
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case address.ip.family
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of IpAddressFamily.IpV4:
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copyMem(addr result[sizeof(id) + 1], unsafeAddr address.ip.address_v4, sizeof(address.ip.address_v4))
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of IpAddressFamily.IpV6:
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copyMem(addr result[sizeof(id) + 1], unsafeAddr address.ip.address_v6, sizeof(address.ip.address_v6))
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copyMem(addr result[sizeof(id) + 1 + sizeof(address.ip.address_v6)], unsafeAddr address.udpPort, sizeof(address.udpPort))
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method storeKeys*(db: DiscoveryDB, id: NodeId, address: Address, r, w: AesKey):
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bool {.raises: [Defect].} =
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try:
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var value: array[sizeof(r) + sizeof(w), byte]
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value[0 .. 15] = r
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value[16 .. ^1] = w
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db.backend.put(makeKey(id, address), value)
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return true
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except CatchableError:
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return false
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method loadKeys*(db: DiscoveryDB, id: NodeId, address: Address, r, w: var AesKey):
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bool {.raises: [Defect].} =
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try:
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let res = db.backend.get(makeKey(id, address))
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if res.len != sizeof(r) + sizeof(w):
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return false
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copyMem(addr r[0], unsafeAddr res[0], sizeof(r))
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copyMem(addr w[0], unsafeAddr res[sizeof(r)], sizeof(w))
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return true
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except CatchableError:
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return false
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method deleteKeys*(db: DiscoveryDB, id: NodeId, address: Address):
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bool {.raises: [Defect].} =
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try:
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db.backend.del(makeKey(id, address))
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return true
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except CatchableError:
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return false
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