Add Init TLV codecs

Author: t-bast

eclair-core/src/main/scala/fr/acinq/eclair/wire/InitTlv.scala

@@ -0,0 +1,61 @@
+/*
+ * Copyright 2019 ACINQ SAS
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package fr.acinq.eclair.wire
+
+import fr.acinq.bitcoin.ByteVector32
+import fr.acinq.eclair.UInt64
+import fr.acinq.eclair.wire.CommonCodecs._
+import scodec.Codec
+import scodec.codecs.{discriminated, list, variableSizeBytesLong}
+
+/**
+ * Created by t-bast on 13/12/2019.
+ */
+
+/** Tlv types used inside Init messages. */
+sealed trait InitTlv extends Tlv
+
+object InitTlv {
+
+  /** The chains the node is interested in. */
+  case class Networks(chainHashes: List[ByteVector32]) extends InitTlv
+
+}
+
+object InitTlvCodecs {
+
+  import InitTlv._
+
+  // TODO: wire test-cases:
+  //  * Init not containing any tlv stream
+  //  * Init containing tlv stream without networks (other odd records)
+  //  * Init containing tlv stream without networks (other even records)
+  //  * Init containing tlv stream with networks only
+  //  * Init containing tlv stream with networks and other odd records)
+  //  * Init containing tlv stream with networks and other even records)
+
+  // TODO:
+  //  * Add to the Init message after flat features merged
+  //  * Send the chainHash from nodeParams when creating Init
+  //  * Add logic to Peer.scala to fail connections to others that don't offer my chainHash
+
+  private val networks: Codec[Networks] = variableSizeBytesLong(varintoverflow, list(bytes32)).as[Networks]
+
+  val initTlvCodec = discriminated[InitTlv].by(varint)
+    .typecase(UInt64(1), networks)
+
+}