Remove ngtcp_pkt_info from public API

Replaced by type ExplicitCongestionNotification (ECN).

quic.nim

@@ -1,6 +1,8 @@
 import quic/version
 import quic/packets
 import quic/connection
+import quic/congestion
 export version
 export packets
 export connection
+export congestion

quic/congestion.nim

@@ -0,0 +1,7 @@
+type
+  ExplicitCongestionNotification {.size: 1.} = enum
+    ecnNonCapable = 0b00
+    ecnCapable1 = 0b01
+    ecnCapable0 = 0b10
+    ecnCongestion = 0b11
+  ECN* = ExplicitCongestionNotification

quic/ngtcp2/udp.nim

@@ -1,16 +1,18 @@
 import std/monotimes
 import ../packets
+import ../congestion
 import ngtcp2
 import connection
 
-proc write*(connection: Connection, datagram: var Datagram, datagramInfo: var ngtcp2_pkt_info): int =
+proc write*(connection: Connection, datagram: var Datagram, ecn: var ECN): int =
   var offset = 0
   var length = 1
   while length > 0 and offset < datagram.len:
+    var packetInfo: ngtcp2_pkt_info
     length = ngtcp2_conn_write_stream(
       connection.conn,
       nil,
-      addr datagramInfo,
+      addr packetInfo,
       addr datagram[offset],
       (datagram.len - offset).uint,
       nil,
@@ -20,14 +22,17 @@ proc write*(connection: Connection, datagram: var Datagram, datagramInfo: var ng
       0,
       getMonoTime().ticks.uint
     )
+    ecn = ECN(packetInfo.ecn)
     offset = offset + length
   offset
 
-proc read*(connection: Connection, datagram: Datagram, datagramInfo: ngtcp2_pkt_info) =
+proc read*(connection: Connection, datagram: Datagram, ecn: ECN) =
+  var packetInfo: ngtcp2_pkt_info
+  packetInfo.ecn = ecn.uint32
   assert 0 == ngtcp2_conn_read_pkt(
     connection.conn,
     unsafeAddr connection.path,
-    unsafeAddr datagramInfo,
+    unsafeAddr packetInfo,
     unsafeAddr datagram[0],
     datagram.len.uint,
     getMonoTime().ticks.uint

tests/quic/testConnection.nim

@@ -1,26 +1,25 @@
 import unittest
 import quic
-import ngtcp2
 import helpers/path
 
 suite "connection":
 
   test "performs handshake":
     var datagram: array[16348, uint8]
-    var datagramInfo: ngtcp2_pkt_info
     var datagramLength = 0
+    var ecn: ECN
 
     let client = newClientConnection(zeroPath)
-    datagramLength = client.write(datagram, datagramInfo)
+    datagramLength = client.write(datagram, ecn)
 
     let server = newServerConnection(zeroPath, datagram)
-    server.read(datagram[0..<datagramLength], datagramInfo)
+    server.read(datagram[0..<datagramLength], ecn)
 
-    datagramLength = server.write(datagram, datagramInfo)
-    client.read(datagram[0..<datagramLength], datagramInfo)
+    datagramLength = server.write(datagram, ecn)
+    client.read(datagram[0..<datagramLength], ecn)
 
-    datagramLength = client.write(datagram, datagramInfo)
-    server.read(datagram[0..<datagramLength], datagramInfo)
+    datagramLength = client.write(datagram, ecn)
+    server.read(datagram[0..<datagramLength], ecn)
 
     check client.isHandshakeCompleted
     check server.isHandshakeCompleted