adds JSON serialization to BitTorrent manifest

codex/bittorrent/manifest/manifest.nim

@@ -4,6 +4,7 @@ import pkg/questionable
 import pkg/questionable/results
 
 import ../../merkletree/codex/codex
+import ../../utils/json
 
 import ../../errors
 import ../../codextypes
@@ -12,14 +13,14 @@ import ../bencoding
 type
   BitTorrentPiece* = MultiHash
   BitTorrentInfo* = ref object
-    length*: uint64
-    pieceLength*: uint32
-    pieces*: seq[BitTorrentPiece]
-    name*: ?string
+    length* {.serialize.}: uint64
+    pieceLength* {.serialize.}: uint32
+    pieces* {.serialize.}: seq[BitTorrentPiece]
+    name* {.serialize.}: ?string
 
   BitTorrentManifest* = ref object
-    info*: BitTorrentInfo
-    codexManifestCid*: Cid
+    info* {.serialize.}: BitTorrentInfo
+    codexManifestCid* {.serialize.}: Cid
 
 proc `$`*(self: BitTorrentInfo): string =
   "BitTorrentInfo(length: " & $self.length & ", pieceLength: " & $self.pieceLength &
@@ -29,6 +30,10 @@ proc `$`*(self: BitTorrentManifest): string =
   "BitTorrentManifest(info: " & $self.info & ", codexManifestCid: " &
     $self.codexManifestCid & ")"
 
+func `==`*(a: BitTorrentInfo, b: BitTorrentInfo): bool =
+  a.length == b.length and a.pieceLength == b.pieceLength and a.pieces == b.pieces and
+    a.name == b.name
+
 proc newBitTorrentManifest*(
     info: BitTorrentInfo, codexManifestCid: Cid
 ): BitTorrentManifest =

codex/utils/json.nim

@@ -2,7 +2,8 @@ import std/options
 import std/typetraits
 from pkg/ethers import Address
 from pkg/libp2p import
-  Cid, PeerId, SignedPeerRecord, MultiAddress, AddressInfo, init, `$`
+  Cid, PeerId, SignedPeerRecord, MultiAddress, AddressInfo, MultiHash, init, hex, `$`
+import pkg/stew/byteutils
 import pkg/contractabi
 import pkg/codexdht/discv5/node as dn
 import pkg/serde/json
@@ -35,3 +36,13 @@ func `%`*(obj: MultiAddress): JsonNode =
 
 func `%`*(address: ethers.Address): JsonNode =
   % $address
+
+proc fromJson*(_: type MultiHash, json: JsonNode): ?!MultiHash =
+  expectJsonKind(MultiHash, JString, json)
+  echo "[MultiHash.fromJson] json.str: ", json.str
+  without bytes =? json.str.hexToSeqByte.catch, err:
+    return failure(err.msg)
+  MultiHash.init(bytes).mapFailure
+
+func `%`*(multiHash: MultiHash): JsonNode =
+  %multiHash.hex