nim-libp2p-experimental/libp2p/transports/transport.nim

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## Nim-LibP2P
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## Copyright (c) 2019 Status Research & Development GmbH
## Licensed under either of
## * Apache License, version 2.0, ([LICENSE-APACHE](LICENSE-APACHE))
## * MIT license ([LICENSE-MIT](LICENSE-MIT))
## at your option.
## This file may not be copied, modified, or distributed except according to
## those terms.
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import sequtils, tables
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import chronos, chronicles
import ../connection,
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../multiaddress,
../multicodec,
../errors
type
ConnHandler* = proc (conn: Connection): Future[void] {.gcsafe.}
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TransportFlag* {.pure.} = enum
ReuseAddr
TransportFlags* = set[TransportFlag]
Transport* = ref object of RootObj
ma*: Multiaddress
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connections*: seq[Connection]
handler*: ConnHandler
multicodec*: MultiCodec
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flags*: TransportFlags
proc transportFlagsToServerFlags*(flags: TransportFlags): set[ServerFlags] {.gcsafe.} =
let transportFlagToServerFlagMapping = {
TransportFlag.ReuseAddr: ServerFlags.ReuseAddr,
}.toTable()
for flag in flags:
result.incl(transportFlagToServerFlagMapping[flag])
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method init*(t: Transport) {.base, gcsafe.} =
## perform protocol initialization
discard
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proc newTransport*(t: typedesc[Transport], flags: TransportFlags = {}): t {.gcsafe.} =
new result
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result.flags = flags
result.init()
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method close*(t: Transport) {.base, async, gcsafe.} =
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## stop and cleanup the transport
## including all outstanding connections
let futs = await allFinished(t.connections.mapIt(it.close()))
checkFutures(futs)
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method listen*(t: Transport,
ma: MultiAddress,
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handler: ConnHandler):
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Future[Future[void]] {.base, async, gcsafe.} =
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## listen for incoming connections
t.ma = ma
t.handler = handler
trace "starting node", address = $ma
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method dial*(t: Transport,
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address: MultiAddress):
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Future[Connection] {.base, async, gcsafe.} =
## dial a peer
discard
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method upgrade*(t: Transport) {.base, async, gcsafe.} =
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## base upgrade method that the transport uses to perform
## transport specific upgrades
discard
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method handles*(t: Transport, address: MultiAddress): bool {.base, gcsafe.} =
## check if transport supportes the multiaddress
# by default we skip circuit addresses to avoid
# having to repeat the check in every transport
address.protocols.filterIt( it == multiCodec("p2p-circuit") ).len == 0
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method localAddress*(t: Transport): MultiAddress {.base, gcsafe.} =
## get the local address of the transport in case started with 0.0.0.0:0
discard