Fix /api/eth/v1/node/peers response.

beacon_chain/rpc/eth2_json_rest_serialization.nim

@@ -36,6 +36,16 @@ proc jsonResponse*(t: typedesc[RestApiResponse],
   ok(ContentBody(contentType: "application/json",
                  data: stream.getOutput(seq[byte])))
 
+proc jsonResponseWMeta*(t: typedesc[RestApiResponse],
+                        data: auto, meta: auto): RestApiResponse =
+  var stream = memoryOutput()
+  var writer = JsonWriter[RestJson].init(stream)
+  writer.beginRecord()
+  writer.writeField("data", data)
+  writer.writeField("meta", meta)
+  writer.endRecord()
+  ok(ContentBody(contentType: "application/json",
+                 data: stream.getOutput(seq[byte])))
 
 proc jsonError*(t: typedesc[RestApiResponse], status: HttpCode = Http200,
                 msg: string = "", stacktrace: string = ""): RestApiResponse =

beacon_chain/rpc/node_rest_api.nim

@@ -198,7 +198,7 @@ proc installNodeApiHandlers*(router: var RestRouter, node: BeaconNode) =
           proto: item.info.protoVersion  # part of specification.
         )
         res.add(peer)
-    return RestApiResponse.jsonResponse(res)
+    return RestApiResponse.jsonResponseWMeta(res, (count: uint64(len(res))))
 
   router.api(MethodGet, "/api/eth/v1/node/peer_count") do () -> RestApiResponse:
     var res: RestNodePeerCountTuple

beacon_chain/rpc/rest_utils.nim

@@ -391,11 +391,6 @@ proc decodeString*(t: typedesc[string],
                    value: string): Result[string, cstring] =
   ok(value)
 
-proc jsonResponse*(t: typedesc[RestApiResponse], j: JsonNode): RestApiResponse =
-  let data =  %*{"data": j}
-  ok(ContentBody(contentType: "application/json",
-                 data: cast[seq[byte]]($data)))
-
 proc getRouter*(): RestRouter =
   RestRouter.init(validate)