Supporting 2 backends is hell.

beacon_chain/request_manager.nim

@@ -33,25 +33,26 @@ proc fetchAncestorBlocksFromPeer(
     debug "Error while fetching ancestor blocks",
           err = err.msg, root = rec.root, peer
 
-proc fetchAncestorBlocksFromNetwork(
-     network: Eth2Node,
-     rec: FetchRecord,
-     responseHandler: FetchAncestorsResponseHandler) {.async.} =
-  var peer: Peer
-  try:
-    peer = await network.peerPool.acquire()
-    let blocks = await peer.beaconBlocksByRoot([rec.root])
-    if blocks.isSome:
-      for b in blocks.get:
-        responseHandler(b)
-  except CatchableError as err:
-    debug "Error while fetching ancestor blocks",
-          err = err.msg, root = rec.root, peer = peer.info
-  finally:
-    if not(isNil(peer)):
-      network.peerPool.release(peer)
-
 when networkBackend == libp2p:
+
+  proc fetchAncestorBlocksFromNetwork(
+       network: Eth2Node,
+       rec: FetchRecord,
+       responseHandler: FetchAncestorsResponseHandler) {.async.} =
+    var peer: Peer
+    try:
+      peer = await network.peerPool.acquire()
+      let blocks = await peer.beaconBlocksByRoot([rec.root])
+      if blocks.isSome:
+        for b in blocks.get:
+          responseHandler(b)
+    except CatchableError as err:
+      debug "Error while fetching ancestor blocks",
+            err = err.msg, root = rec.root, peer = peer.info
+    finally:
+      if not(isNil(peer)):
+        network.peerPool.release(peer)
+
   proc fetchAncestorBlocks*(requestManager: RequestManager,
                             roots: seq[FetchRecord],
                             responseHandler: FetchAncestorsResponseHandler) =