mirror of https://github.com/waku-org/nwaku.git
104 lines
3.0 KiB
Nim
104 lines
3.0 KiB
Nim
{.push raises: [].}
|
||
|
||
import std/[options, bitops, sequtils, net], results, eth/keys, libp2p/crypto/crypto
|
||
import ../common/enr
|
||
|
||
const CapabilitiesEnrField* = "waku2"
|
||
|
||
type
|
||
## 8-bit flag field to indicate Waku node capabilities.
|
||
## Only the 4 LSBs are currently defined according
|
||
## to RFC31 (https://rfc.vac.dev/spec/31/).
|
||
CapabilitiesBitfield* = distinct uint8
|
||
|
||
## See: https://rfc.vac.dev/spec/31/#waku2-enr-key
|
||
## each enum numbers maps to a bit (where 0 is the LSB)
|
||
Capabilities* {.pure.} = enum
|
||
Relay = 0
|
||
Store = 1
|
||
Filter = 2
|
||
Lightpush = 3
|
||
Sync = 4
|
||
|
||
func init*(
|
||
T: type CapabilitiesBitfield, lightpush, filter, store, relay, sync: bool = false
|
||
): T =
|
||
## Creates an waku2 ENR flag bit field according to RFC 31 (https://rfc.vac.dev/spec/31/)
|
||
var bitfield: uint8
|
||
if relay:
|
||
bitfield.setBit(0)
|
||
if store:
|
||
bitfield.setBit(1)
|
||
if filter:
|
||
bitfield.setBit(2)
|
||
if lightpush:
|
||
bitfield.setBit(3)
|
||
if sync:
|
||
bitfield.setBit(4)
|
||
CapabilitiesBitfield(bitfield)
|
||
|
||
func init*(T: type CapabilitiesBitfield, caps: varargs[Capabilities]): T =
|
||
## Creates an waku2 ENR flag bit field according to RFC 31 (https://rfc.vac.dev/spec/31/)
|
||
var bitfield: uint8
|
||
for cap in caps:
|
||
bitfield.setBit(ord(cap))
|
||
CapabilitiesBitfield(bitfield)
|
||
|
||
converter toCapabilitiesBitfield*(field: uint8): CapabilitiesBitfield =
|
||
CapabilitiesBitfield(field)
|
||
|
||
proc supportsCapability*(bitfield: CapabilitiesBitfield, cap: Capabilities): bool =
|
||
testBit(bitfield.uint8, ord(cap))
|
||
|
||
func toCapabilities*(bitfield: CapabilitiesBitfield): seq[Capabilities] =
|
||
toSeq(Capabilities.low .. Capabilities.high).filterIt(
|
||
supportsCapability(bitfield, it)
|
||
)
|
||
|
||
# ENR builder extension
|
||
|
||
proc withWakuCapabilities*(builder: var EnrBuilder, caps: CapabilitiesBitfield) =
|
||
builder.addFieldPair(CapabilitiesEnrField, @[caps.uint8])
|
||
|
||
proc withWakuCapabilities*(builder: var EnrBuilder, caps: varargs[Capabilities]) =
|
||
withWakuCapabilities(builder, CapabilitiesBitfield.init(caps))
|
||
|
||
proc withWakuCapabilities*(builder: var EnrBuilder, caps: openArray[Capabilities]) =
|
||
withWakuCapabilities(builder, CapabilitiesBitfield.init(@caps))
|
||
|
||
# ENR record accessors (e.g., Record, TypedRecord, etc.)
|
||
|
||
func waku2*(record: TypedRecord): Option[CapabilitiesBitfield] =
|
||
let field = record.tryGet(CapabilitiesEnrField, seq[uint8])
|
||
if field.isNone():
|
||
return none(CapabilitiesBitfield)
|
||
|
||
if field.get().len != 1:
|
||
return none(CapabilitiesBitfield)
|
||
|
||
some(CapabilitiesBitfield(field.get()[0]))
|
||
|
||
proc supportsCapability*(r: Record, cap: Capabilities): bool =
|
||
let recordRes = r.toTyped()
|
||
if recordRes.isErr():
|
||
return false
|
||
|
||
let bitfieldOpt = recordRes.value.waku2
|
||
if bitfieldOpt.isNone():
|
||
return false
|
||
|
||
let bitfield = bitfieldOpt.get()
|
||
bitfield.supportsCapability(cap)
|
||
|
||
proc getCapabilities*(r: Record): seq[Capabilities] =
|
||
let recordRes = r.toTyped()
|
||
if recordRes.isErr():
|
||
return @[]
|
||
|
||
let bitfieldOpt = recordRes.value.waku2
|
||
if bitfieldOpt.isNone():
|
||
return @[]
|
||
|
||
let bitfield = bitfieldOpt.get()
|
||
bitfield.toCapabilities()
|