initial commit for native libp2p implementation

libp2p/connection.nim

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+## Nim-LibP2P
+## Copyright (c) 2018 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.
+
+import chronos, peerinfo, multiaddress
+
+const DefaultReadSize = 1024
+
+type
+  Connection* = ref object of RootObj
+    reader: AsyncStreamReader
+    writter: AsyncStreamWriter
+
+proc newConnection*(reader: AsyncStreamReader, writter: AsyncStreamWriter): Connection = 
+  ## create a new Connection for the specified async stream reader/writter
+  new result
+  result.reader = reader
+  result.writter = writter
+
+method read* (c: Connection, size: int = DefaultReadSize): Future[seq[byte]] {.base, async.} = 
+  ## read DefaultReadSize (1024) bytes or `size` bytes if specified
+  result = await c.reader.read(size)
+
+method write* (c: Connection, data: pointer, size: int): Future[void] {.base, async.} = 
+  ## write bytes pointed to by `data` up to `size` size
+  result = c.writter.write(data, size)
+
+method close* (c: Connection): Future[void] {.base, async.} = 
+  ## close connection
+  ## TODO: figure out how to correctly close the streams and underlying resource
+  discard
+
+method getPeerInfo* (c: Connection): Future[PeerInfo] {.base, async.} = 
+  ## get up to date peer info
+  ## TODO: implement PeerInfo refresh over identify
+  discard
+
+method getObservedAddrs(c: Connection): Future[seq[MultiAddress]] {.base, async.} =
+  ## get resolved multiaddresses for the connection
+  discard

libp2p/peerinfo.nim

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+## Nim-LibP2P
+## Copyright (c) 2018 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.
+
+import peer, multiaddress
+
+type PeerInfo* = ref object of RootRef
+  peerId*: PeerID
+  addrs*: seq[MultiAddress]
+  protocols*: seq[string]

libp2p/tcptransport.nim

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+## Nim-LibP2P
+## Copyright (c) 2018 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.
+
+import chronos
+import transport, wire, connection, multiaddress, connection, multicodec
+
+type TcpTransport* = ref object of Transport
+  fd*: AsyncFD
+  server*: StreamServer
+
+proc connHandler(server: StreamServer,
+                 client: StreamTransport): Future[Connection] {.gcsafe, async.} =
+  let t: TcpTransport = cast[TcpTransport](server.udata)
+  let conn: Connection = newConnection(newAsyncStreamReader(client),
+                                       newAsyncStreamWriter(client))
+  let connHolder: ConnHolder = ConnHolder(connection: conn,
+                                          connFuture: t.handler(conn))
+  t.connections.add(connHolder)
+  result = conn
+
+proc connCb(server: StreamServer,
+                 client: StreamTransport) {.gcsafe, async.} =
+  discard connHandler(server, client)
+
+method init*(t: TcpTransport) =
+  t.multicodec = multiCodec("tcp")
+
+method close*(t: TcpTransport): Future[void] {.async.} =
+  ## start the transport
+  result = t.server.closeWait()
+
+method listen*(t: TcpTransport): Future[void] {.async.} =
+  let listenFuture: Future[void] = newFuture[void]()
+  result = listenFuture
+
+  ## listen on the transport
+  discard createStreamServer(t.ma,
+                             connCb,
+                             {},
+                             t,
+                             asyncInvalidSocket,
+                             100,
+                             DefaultStreamBufferSize,
+                             nil,
+                             proc (server: StreamServer,
+                                   fd: AsyncFD): StreamTransport {.gcsafe.} =
+    t.server = server
+    t.fd = fd
+    listenFuture.complete()
+  )
+
+method dial*(t: TcpTransport,
+             address: MultiAddress): Future[Connection] {.async.} =
+  ## dial a peer
+  let client: StreamTransport = await connect(address)
+  result = await connHandler(t.server, client)

libp2p/transport.nim

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+## Nim-LibP2P
+## Copyright (c) 2018 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.
+
+import chronos
+import peerinfo, connection, multiaddress, multicodec
+
+type
+  ConnHandler* = proc (conn: Connection): Future[void] {.gcsafe.}
+
+  ConnHolder* = object
+    connection*: Connection
+    connFuture*: Future[void]
+
+  Transport* = ref object of RootObj
+    ma*: Multiaddress
+    connections*: seq[ConnHolder]
+    handler*: ConnHandler
+    multicodec*: MultiCodec
+
+method init*(t: Transport) {.base.} = 
+  ## perform protocol initialization
+  discard
+
+proc new*(t: typedesc[Transport], 
+          ma: MultiAddress, 
+          handler: ConnHandler): t = 
+  new result
+  result.ma = ma
+  result.handler = handler
+  result.init()
+
+method close*(t: Transport) {.base, async.} =
+  ## start the transport
+  discard
+
+method listen*(t: Transport) {.base, async.} =
+  ## stop the transport
+  discard
+
+method dial*(t: Transport, address: MultiAddress): Future[Connection] {.base, async.} = 
+  ## dial a peer
+  discard
+
+method supports(t: Transport, address: MultiAddress): bool {.base.} = 
+  ## check if transport supportes the multiaddress
+  # TODO: this should implement generic logic that would use the multicodec 
+  # declared in the multicodec field and set by each individual transport
+  result = true