Add denomMetadata/denomsMetadata queries to BankExtension

CHANGELOG.md

@@ -10,8 +10,11 @@ and this project adheres to
 
 - @cosmjs/tendermint-rpc: Add `hash` field to `BroadcastTxAsyncResponse`
   ([#938]).
+- @cosmjs/stargate: Add `denomMetadata` and `denomsMetadata` to `BankExtension`
+  ([#932]).
 
 [#938]: https://github.com/cosmos/cosmjs/issues/938
+[#932]: https://github.com/cosmos/cosmjs/issues/932
 
 ### Fixed
 

packages/stargate/src/queries/bank.spec.ts

@@ -143,4 +143,74 @@ describe("BankExtension", () => {
       tmClient.disconnect();
     });
   });
+
+  describe("denomMetadata", () => {
+    it("works for existent denom", async () => {
+      pendingWithoutSimapp();
+      const [client, tmClient] = await makeClientWithBank(simapp.tendermintUrl);
+
+      const metadata = await client.bank.denomMetadata("ucosm");
+      expect(metadata).toEqual({
+        description: "The fee token of this test chain",
+        denomUnits: [
+          {
+            denom: "ucosm",
+            exponent: 0,
+            aliases: [],
+          },
+          {
+            denom: "COSM",
+            exponent: 6,
+            aliases: [],
+          },
+        ],
+        base: "ucosm",
+        display: "COSM",
+        name: "",
+        symbol: "",
+      });
+
+      tmClient.disconnect();
+    });
+
+    it("works for non-existent denom", async () => {
+      pendingWithoutSimapp();
+      const [client, tmClient] = await makeClientWithBank(simapp.tendermintUrl);
+
+      await expectAsync(client.bank.denomMetadata("nothere")).toBeRejectedWithError(/code = NotFound/i);
+
+      tmClient.disconnect();
+    });
+  });
+
+  describe("denomsMetadata", () => {
+    it("works", async () => {
+      pendingWithoutSimapp();
+      const [client, tmClient] = await makeClientWithBank(simapp.tendermintUrl);
+
+      const metadatas = await client.bank.denomsMetadata();
+      expect(metadatas.length).toEqual(1);
+      expect(metadatas[0]).toEqual({
+        description: "The fee token of this test chain",
+        denomUnits: [
+          {
+            denom: "ucosm",
+            exponent: 0,
+            aliases: [],
+          },
+          {
+            denom: "COSM",
+            exponent: 6,
+            aliases: [],
+          },
+        ],
+        base: "ucosm",
+        display: "COSM",
+        name: "",
+        symbol: "",
+      });
+
+      tmClient.disconnect();
+    });
+  });
 });

packages/stargate/src/queries/bank.ts

@@ -1,5 +1,6 @@
 /* eslint-disable @typescript-eslint/naming-convention */
 import { assert } from "@cosmjs/utils";
+import { Metadata } from "cosmjs-types/cosmos/bank/v1beta1/bank";
 import { QueryClientImpl } from "cosmjs-types/cosmos/bank/v1beta1/query";
 import { Coin } from "cosmjs-types/cosmos/base/v1beta1/coin";
 
@@ -12,6 +13,8 @@ export interface BankExtension {
     readonly allBalances: (address: string) => Promise<Coin[]>;
     readonly totalSupply: () => Promise<Coin[]>;
     readonly supplyOf: (denom: string) => Promise<Coin>;
+    readonly denomMetadata: (denom: string) => Promise<Metadata>;
+    readonly denomsMetadata: () => Promise<Metadata[]>;
   };
 }
 
@@ -41,6 +44,17 @@ export function setupBankExtension(base: QueryClient): BankExtension {
         assert(amount);
         return amount;
       },
+      denomMetadata: async (denom: string) => {
+        const { metadata } = await queryService.DenomMetadata({ denom });
+        assert(metadata);
+        return metadata;
+      },
+      denomsMetadata: async () => {
+        const { metadatas } = await queryService.DenomsMetadata({
+          pagination: undefined, // Not implemented
+        });
+        return metadatas;
+      },
     },
   };
 }