Add get validators helper

lib/staking.ts

@@ -0,0 +1,25 @@
+import { QueryClient, StakingExtension, setupStakingExtension } from "@cosmjs/stargate";
+import { Tendermint34Client } from "@cosmjs/tendermint-rpc";
+import { Validator } from "cosmjs-types/cosmos/staking/v1beta1/staking";
+
+const getValidatorsPage = (
+  queryClient: QueryClient & StakingExtension,
+  paginationKey: Uint8Array | undefined,
+) => queryClient.staking.validators("BOND_STATUS_BONDED", paginationKey);
+
+export const getAllValidators = async (rpcUrl: string): Promise<readonly Validator[]> => {
+  const validators: Validator[] = [];
+
+  const tmClient = await Tendermint34Client.connect(rpcUrl);
+  const queryClient = QueryClient.withExtensions(tmClient, setupStakingExtension);
+
+  let paginationKey: Uint8Array | undefined = undefined;
+
+  do {
+    const response = await getValidatorsPage(queryClient, paginationKey);
+    validators.push(...response.validators);
+    paginationKey = response.pagination?.nextKey;
+  } while (paginationKey?.length);
+
+  return validators;
+};