Add decodeCosmosSdkDecFromProto and MintExtension

CHANGELOG.md

@@ -14,6 +14,9 @@ and this project adheres to
   ([#932]).
 - @cosmjs/stargate: Merge `DeliverTxFailure` and `DeliverTxSuccess` into a
   single `DeliverTxResponse` ([#878], [#949]). Add `assertIsDeliverTxFailure`.
+- @cosmjs/stargate: Created initial `MintExtension`.
+- @cosmjs/stargate: Created `types.Dec` decoder function
+  `decodeCosmosSdkDecFromProto`.
 - @cosmjs/amino: Added `StdTx`, `isStdTx` and `makeStdTx` and removed them from
   @cosmjs/launchpad. They are re-exported in @cosmjs/launchpad for backwards
   compatibility.

packages/stargate/src/index.ts

@@ -62,18 +62,21 @@ export {
   BankExtension,
   createPagination,
   createProtobufRpcClient,
+  decodeCosmosSdkDecFromProto,
   DistributionExtension,
   GovExtension,
   GovParamsType,
   GovProposalId,
   IbcExtension,
+  MintExtension,
   ProtobufRpcClient,
   QueryClient,
   setupAuthExtension,
   setupBankExtension,
   setupDistributionExtension,
   setupGovExtension,
   setupIbcExtension,
+  setupMintExtension,
   setupStakingExtension,
   setupTxExtension,
   StakingExtension,

packages/stargate/src/queries/index.ts

@@ -9,6 +9,12 @@ export { BankExtension, setupBankExtension } from "./bank";
 export { DistributionExtension, setupDistributionExtension } from "./distribution";
 export { GovExtension, GovParamsType, GovProposalId, setupGovExtension } from "./gov";
 export { IbcExtension, setupIbcExtension } from "./ibc";
+export { MintExtension, setupMintExtension } from "./mint";
 export { setupStakingExtension, StakingExtension } from "./staking";
 export { setupTxExtension, TxExtension } from "./tx";
-export { createPagination, createProtobufRpcClient, ProtobufRpcClient } from "./utils";
+export {
+  createPagination,
+  createProtobufRpcClient,
+  decodeCosmosSdkDecFromProto,
+  ProtobufRpcClient,
+} from "./utils";

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

@@ -0,0 +1,30 @@
+import { Tendermint34Client } from "@cosmjs/tendermint-rpc";
+import { assert } from "@cosmjs/utils";
+
+import { QueryClient } from "../";
+import { pendingWithoutSimapp, simapp } from "../testutils.spec";
+import { MintExtension, setupMintExtension } from "./mint";
+import { decodeCosmosSdkDecFromProto } from "./utils";
+
+async function makeClientWithMint(
+  rpcUrl: string,
+): Promise<[QueryClient & MintExtension, Tendermint34Client]> {
+  const tmClient = await Tendermint34Client.connect(rpcUrl);
+  return [QueryClient.withExtensions(tmClient, setupMintExtension), tmClient];
+}
+
+describe("MintExtension", () => {
+  describe("inflation", () => {
+    it("works", async () => {
+      pendingWithoutSimapp();
+      const [client, tmClient] = await makeClientWithMint(simapp.tendermintUrl);
+
+      const response = await client.mint.inflation();
+      assert(response.inflation);
+      expect(decodeCosmosSdkDecFromProto(response.inflation).toFloatApproximation()).toBeGreaterThan(0.13);
+      expect(decodeCosmosSdkDecFromProto(response.inflation).toFloatApproximation()).toBeLessThan(0.1301);
+
+      tmClient.disconnect();
+    });
+  });
+});

packages/stargate/src/queries/mint.ts

@@ -0,0 +1,26 @@
+import { QueryClientImpl, QueryInflationResponse } from "cosmjs-types/cosmos/mint/v1beta1/query";
+
+import { createProtobufRpcClient } from "../";
+import { QueryClient } from "./queryclient";
+
+export interface MintExtension {
+  readonly mint: {
+    inflation: () => Promise<QueryInflationResponse>;
+  };
+}
+
+export function setupMintExtension(base: QueryClient): MintExtension {
+  const rpc = createProtobufRpcClient(base);
+  // Use this service to get easy typed access to query methods
+  // This cannot be used for proof verification
+  const queryService = new QueryClientImpl(rpc);
+
+  return {
+    mint: {
+      inflation: async () => {
+        const response = await queryService.Inflation({});
+        return response;
+      },
+    },
+  };
+}

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

@@ -0,0 +1,21 @@
+import { fromHex } from "@cosmjs/encoding";
+
+import { decodeCosmosSdkDecFromProto } from "./utils";
+
+describe("utils", () => {
+  describe("decodeCosmosSdkDecFromProto", () => {
+    it("works for string inputs", () => {
+      expect(decodeCosmosSdkDecFromProto("0").toString()).toEqual("0");
+      expect(decodeCosmosSdkDecFromProto("1").toString()).toEqual("0.000000000000000001");
+      expect(decodeCosmosSdkDecFromProto("3000000").toString()).toEqual("0.000000000003");
+      expect(decodeCosmosSdkDecFromProto("123456789123456789").toString()).toEqual("0.123456789123456789");
+      expect(decodeCosmosSdkDecFromProto("1234567891234567890").toString()).toEqual("1.23456789123456789");
+    });
+
+    it("works for byte inputs", () => {
+      expect(decodeCosmosSdkDecFromProto(fromHex("313330303033343138373830313631333938")).toString()).toEqual(
+        "0.130003418780161398",
+      );
+    });
+  });
+});

packages/stargate/src/queries/utils.ts

@@ -1,5 +1,5 @@
-import { Bech32 } from "@cosmjs/encoding";
-import { Uint64 } from "@cosmjs/math";
+import { Bech32, fromAscii } from "@cosmjs/encoding";
+import { Decimal, Uint64 } from "@cosmjs/math";
 import { PageRequest } from "cosmjs-types/cosmos/base/query/v1beta1/pagination";
 import Long from "long";
 
@@ -53,3 +53,14 @@ export function longify(value: string | number | Long | Uint64): Long {
   const checkedValue = Uint64.fromString(value.toString());
   return Long.fromBytesBE([...checkedValue.toBytesBigEndian()], true);
 }
+
+/**
+ * Takes a string or binary encoded `github.com/cosmos/cosmos-sdk/types.Dec` from the
+ * protobuf API and converts it into a `Decimal` with 18 fractional digits.
+ *
+ * See https://github.com/cosmos/cosmos-sdk/issues/10863 for more context why this is needed.
+ */
+export function decodeCosmosSdkDecFromProto(input: string | Uint8Array): Decimal {
+  const asString = typeof input === "string" ? input : fromAscii(input);
+  return Decimal.fromAtomics(asString, 18);
+}