nim-libp2p/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.
##
{.push raises: [Defect].}
import sequtils
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import chronos, chronicles
import ../stream/connection,
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../multiaddress,
../multicodec
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logScope:
topics = "libp2p transport"
type
TransportError* = object of LPError
TransportClosedError* = object of TransportError
Transport* = ref object of RootObj
ma*: Multiaddress
multicodec*: MultiCodec
running*: bool
proc newTransportClosedError*(parent: ref Exception = nil): ref LPError =
newException(TransportClosedError,
"Transport closed, no more connections!", parent)
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method initTransport*(t: Transport) {.base, gcsafe, locks: "unknown".} =
## perform protocol initialization
##
discard
method start*(t: Transport, ma: MultiAddress) {.base, async.} =
## start the transport
##
t.ma = ma
trace "starting transport", address = $ma
method stop*(t: Transport) {.base, async.} =
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## stop and cleanup the transport
## including all outstanding connections
##
discard
method accept*(t: Transport): Future[Connection]
{.base, async, gcsafe.} =
## accept incoming connections
##
discard
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method dial*(t: Transport,
address: MultiAddress): 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
##
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discard
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method handles*(t: Transport, address: MultiAddress): bool {.base, gcsafe.} =
## check if transport supports the multiaddress
##
# by default we skip circuit addresses to avoid
# having to repeat the check in every transport
if address.protocols.isOk:
return address.protocols.get().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
##
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discard