From 7bd1e04d6f5a51fcaf791f29b2145ae297e443c0 Mon Sep 17 00:00:00 2001
From: Dmitriy Ryajov <dryajov@gmail.com>
Date: Sun, 1 Sep 2019 15:52:51 -0600
Subject: [PATCH] wip: modeling mplex

---
 libp2p/mplex/channel.nim | 58 ++++++++++++++++++++++++++++++++++++++++
 libp2p/mplex/mplex.nim   | 31 +++++++++++++++++++++
 libp2p/mplex/types.nim   | 19 +++++++++++++
 3 files changed, 108 insertions(+)
 create mode 100644 libp2p/mplex/channel.nim
 create mode 100644 libp2p/mplex/mplex.nim
 create mode 100644 libp2p/mplex/types.nim

diff --git a/libp2p/mplex/channel.nim b/libp2p/mplex/channel.nim
new file mode 100644
index 000000000..96fa77a6b
--- /dev/null
+++ b/libp2p/mplex/channel.nim
@@ -0,0 +1,58 @@
+## 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 ../connection, ../stream
+import mplex
+
+type
+  Channel = ref object of LPStream
+    id*: int
+    initiator*: bool
+    reset*: bool
+    closedLocal*: bool
+    closedRemote*: bool
+    buffer*: seq[byte]
+
+proc newChannel*(mplex: Mplex, id: int, initiator: bool): Channel = 
+  new result
+  result.id = id
+  result.initiator = initiator
+
+proc closed*(s: Channel): bool = s.closedLocal and s.closedRemote
+proc close*(s: Channel) = discard
+
+method read*(s: Channel, n = -1): Future[seq[byte]] {.async, gcsafe.} =
+  discard
+
+method readExactly*(s: Channel, pbytes: pointer, nbytes: int): Future[void] {.async, gcsafe.} =
+  discard
+
+method readLine*(s: Channel, limit = 0, sep = "\r\n"): Future[string] {.async, gcsafe.} =
+  discard
+
+method readOnce*(s: Channel, pbytes: pointer, nbytes: int): Future[int] {.async, gcsafe.} =
+  discard
+
+method readUntil*(s: Channel,
+                  pbytes: pointer, nbytes: int,
+                  sep: seq[byte]): Future[int] {.async, gcsafe.} =
+  discard
+
+method write*(s: Channel, pbytes: pointer, nbytes: int) {.async, gcsafe.} =
+  discard
+
+method write*(s: Channel, msg: string, msglen = -1) {.async, gcsafe.} =
+  discard
+
+method write*(s: Channel, msg: seq[byte], msglen = -1) {.async, gcsafe.} =
+  discard
+
+method close*(s: Channel) {.async, gcsafe.} =
+  discard
diff --git a/libp2p/mplex/mplex.nim b/libp2p/mplex/mplex.nim
new file mode 100644
index 000000000..6e5c0685b
--- /dev/null
+++ b/libp2p/mplex/mplex.nim
@@ -0,0 +1,31 @@
+## 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 tables
+import chronos
+import ../connection, ../stream
+import types
+import channel
+
+type
+  ChannelHandler* = proc(conn: Connection) {.gcsafe.}
+
+  Mplex* = ref object of RootObj
+    connections*: seq[Connection]
+    channels*: TableRef[uint, Connection]
+    handler*: ChannelHandler
+
+proc newMplex*(handler: ChannelHandler): Mplex =
+  new result
+  result.channels = newTable[uint, Connection]()
+  result.handler = handler
+
+proc newStream*(m: Mplex, conn: Connection): Connection {.gcsafe.} = discard
+proc handle*(m: Mplex, conn: Connection) {.gcsafe.} = discard
+proc send*(m: Mplex, msg: Message) {.async, gcsafe.} = discard
diff --git a/libp2p/mplex/types.nim b/libp2p/mplex/types.nim
new file mode 100644
index 000000000..7cec08f0b
--- /dev/null
+++ b/libp2p/mplex/types.nim
@@ -0,0 +1,19 @@
+## 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.
+
+const MaxMsgSize* = 1 shl 20 # 1mb
+
+type 
+  MessageType* = enum
+    New, InMsg, OutMsg, InClose, OutClose, InReset, OutReset
+
+  Message* = ref object of RootObj
+    id*: int
+    msgaType*: MessageType
+    data*: seq[byte]