Adds isSyncing to provider (#62)

ethers/provider.nim

@@ -182,6 +182,9 @@ method unsubscribe*(
 
   doAssert false, "not implemented"
 
+method isSyncing*(provider: Provider): Future[bool] {.base, async.} =
+  doAssert false, "not implemented"
+
 proc replay*(
   provider: Provider,
   tx: Transaction,

ethers/providers/jsonrpc.nim

@@ -268,6 +268,10 @@ method unsubscribe*(
     let id = subscription.id
     await subscriptions.unsubscribe(id)
 
+method isSyncing*(provider: JsonRpcProvider): Future[bool] {.async.} =
+  let response = await provider.send("eth_syncing")
+  return response.getBool()
+
 method close*(
   provider: JsonRpcProvider) {.async: (raises:[ProviderError]).} =
 

testmodule/providers/jsonrpc/testJsonRpcProvider.nim

@@ -98,3 +98,8 @@ for url in ["ws://localhost:8545", "http://localhost:8545"]:
         discard await provider.subscribe(proc(_: Block) = discard)
       expect JsonRpcSignerError:
         discard await provider.getSigner().sendTransaction(Transaction.example)
+
+    test "syncing":
+      let isSyncing = await provider.isSyncing()
+      check not isSyncing
+