214 lines
7.8 KiB
Nim
214 lines
7.8 KiB
Nim
when not(compileOption("threads")):
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{.fatal: "Please, compile this program with the --threads:on option!".}
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import tables, strformat, strutils
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import chronos # an efficient library for async
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import ../libp2p/[switch, # manage transports, a single entry point for dialing and listening
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multistream, # tag stream with short header to identify it
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crypto/crypto, # cryptographic functions
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errors, # error handling utilities
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protocols/identify, # identify the peer info of a peer
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connection, # create and close stream read / write connections
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transports/transport, # listen and dial to other peers using p2p protocol
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transports/tcptransport, # listen and dial to other peers using client-server protocol
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multiaddress, # encode different addressing schemes. For example, /ip4/7.7.7.7/tcp/6543 means it is using IPv4 protocol and TCP
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peerinfo, # manage the information of a peer, such as peer ID and public / private key
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peer, # Implement how peers interact
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protocols/protocol, # define the protocol base type
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protocols/secure/secure, # define the protocol of secure connection
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protocols/secure/secio, # define the protocol of secure input / output, allows encrypted communication that uses public keys to validate signed messages instead of a certificate authority like in TLS
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muxers/muxer, # define an interface for stream multiplexing, allowing peers to offer many protocols over a single connection
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muxers/mplex/mplex, # implement stream multiplexing
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muxers/mplex/types] # define some contants and message types for stream multiplexing
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const ChatCodec = "/nim-libp2p/chat/1.0.0"
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const DefaultAddr = "/ip4/127.0.0.1/tcp/55505"
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const Help = """
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Commands: /[?|hep|connect|disconnect|exit]
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help: Prints this help
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connect: dials a remote peer
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disconnect: ends current session
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exit: closes the chat
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"""
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type ChatProto = ref object of LPProtocol
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switch: Switch # a single entry point for dialing and listening to peer
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transp: StreamTransport # transport streams between read & write file descriptor
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conn: Connection # create and close read & write stream
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connected: bool # if the node is connected to another peer
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started: bool # if the node has started
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proc initAddress(T: type MultiAddress, str: string): T =
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let address = MultiAddress.init(str)
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if IPFS.match(address) and matchPartial(multiaddress.TCP, address):
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result = address
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else:
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raise newException(MultiAddressError,
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"Invalid bootstrap node multi-address")
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proc dialPeer(p: ChatProto, address: string) {.async.} =
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let multiAddr = MultiAddress.initAddress(address);
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let parts = address.split("/")
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let remotePeer = PeerInfo.init(parts[^1],
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[multiAddr])
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echo &"dialing peer: {multiAddr}"
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p.conn = await p.switch.dial(remotePeer, ChatCodec)
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p.connected = true
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proc readAndPrint(p: ChatProto) {.async.} =
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while true:
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while p.connected:
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# TODO: echo &"{p.id} -> "
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echo cast[string](await p.conn.readLp())
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await sleepAsync(100.millis)
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proc writeAndPrint(p: ChatProto) {.async.} =
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while true:
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if not p.connected:
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echo "type an address or wait for a connection:"
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echo "type /[help|?] for help"
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let line = await p.transp.readLine()
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if line.startsWith("/help") or line.startsWith("/?") or not p.started:
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echo Help
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continue
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if line.startsWith("/disconnect"):
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echo "Ending current session"
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if p.connected and p.conn.closed.not:
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await p.conn.close()
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p.connected = false
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elif line.startsWith("/connect"):
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if p.connected:
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var yesno = "N"
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echo "a session is already in progress, do you want end it [y/N]?"
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yesno = await p.transp.readLine()
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if yesno.cmpIgnoreCase("y") == 0:
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await p.conn.close()
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p.connected = false
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elif yesno.cmpIgnoreCase("n") == 0:
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continue
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else:
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echo "unrecognized response"
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continue
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echo "enter address of remote peer"
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let address = await p.transp.readLine()
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if address.len > 0:
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await p.dialPeer(address)
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elif line.startsWith("/exit"):
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if p.connected and p.conn.closed.not:
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await p.conn.close()
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p.connected = false
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await p.switch.stop()
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echo "quitting..."
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quit(0)
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else:
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if p.connected:
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await p.conn.writeLp(line)
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else:
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try:
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if line.startsWith("/") and "ipfs" in line:
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await p.dialPeer(line)
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except:
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echo &"unable to dial remote peer {line}"
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echo getCurrentExceptionMsg()
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proc readWriteLoop(p: ChatProto) {.async.} =
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asyncCheck p.writeAndPrint() # execute the async function but does not block
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asyncCheck p.readAndPrint()
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proc newChatProto(switch: Switch, transp: StreamTransport): ChatProto =
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var chatproto = ChatProto(switch: switch, transp: transp, codec: ChatCodec)
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# create handler for incoming connection
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proc handle(stream: Connection, proto: string) {.async.} =
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if chatproto.connected and not chatproto.conn.closed:
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echo "a chat session is already in progress - disconnecting!"
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await stream.close()
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else:
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chatproto.conn = stream
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chatproto.connected = true
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# assign the new handler
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chatproto.handler = handle
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return chatproto
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proc readInput(wfd: AsyncFD) {.thread.} =
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## This procedure performs reading from `stdin` and sends data over
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## pipe to main thread.
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let transp = fromPipe(wfd)
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while true:
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let line = stdin.readLine()
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discard waitFor transp.write(line & "\r\n")
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proc processInput(rfd: AsyncFD) {.async.} =
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let transp = fromPipe(rfd)
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let seckey = PrivateKey.random(RSA)
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let peerInfo = PeerInfo.init(seckey)
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var localAddress = DefaultAddr
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while true:
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echo &"Type an address to bind to or Enter to use the default {DefaultAddr}"
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let a = await transp.readLine()
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try:
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if a.len > 0:
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peerInfo.addrs.add(Multiaddress.init(a))
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break
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peerInfo.addrs.add(Multiaddress.init(localAddress))
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break
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except:
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echo "invalid address"
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localAddress = DefaultAddr
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continue
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# a constructor for building different multiplexers under various connections
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proc createMplex(conn: Connection): Muxer =
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result = newMplex(conn)
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let mplexProvider = newMuxerProvider(createMplex, MplexCodec)
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let transports = @[Transport(newTransport(TcpTransport))]
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let muxers = [(MplexCodec, mplexProvider)].toTable()
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let identify = newIdentify(peerInfo)
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let secureManagers = [(SecioCodec, Secure(newSecio(seckey)))].toTable()
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let switch = newSwitch(peerInfo,
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transports,
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identify,
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muxers,
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secureManagers)
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let chatProto = newChatProto(switch, transp)
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switch.mount(chatProto)
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let libp2pFuts = await switch.start()
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chatProto.started = true
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let id = peerInfo.peerId.pretty
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echo "PeerID: " & id
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echo "listening on: "
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for a in peerInfo.addrs:
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echo &"{a}/ipfs/{id}"
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await chatProto.readWriteLoop()
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await allFuturesThrowing(libp2pFuts)
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proc main() {.async.} =
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let (rfd, wfd) = createAsyncPipe()
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if rfd == asyncInvalidPipe or wfd == asyncInvalidPipe:
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raise newException(ValueError, "Could not initialize pipe!")
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var thread: Thread[AsyncFD]
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thread.createThread(readInput, wfd)
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await processInput(rfd)
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when isMainModule: # isMainModule = true when the module is compiled as the main file
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waitFor(main())
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