feat: add fee grant query (#200)

* feat: add fee grant query
* feat: add unit test

src/client/lcd/LCDClient.ts

@@ -3,6 +3,7 @@ import {
   AuthAPI,
   BankAPI,
   DistributionAPI,
+  FeeGrantAPI,
   GovAPI,
   MarketAPI,
   MintAPI,
@@ -86,6 +87,7 @@ export class LCDClient {
   public auth: AuthAPI;
   public bank: BankAPI;
   public distribution: DistributionAPI;
+  public feeGrant: FeeGrantAPI;
   public gov: GovAPI;
   public market: MarketAPI;
   public mint: MintAPI;
@@ -120,6 +122,7 @@ export class LCDClient {
     this.auth = new AuthAPI(this.apiRequester);
     this.bank = new BankAPI(this.apiRequester);
     this.distribution = new DistributionAPI(this.apiRequester);
+    this.feeGrant = new FeeGrantAPI(this.apiRequester);
     this.gov = new GovAPI(this.apiRequester);
     this.market = new MarketAPI(this.apiRequester);
     this.mint = new MintAPI(this.apiRequester);

src/client/lcd/api/FeeGrantAPI.spec.ts

@@ -0,0 +1,44 @@
+import { APIRequester } from '../APIRequester';
+import { FeeGrantAPI } from './FeeGrantAPI';
+
+const c = new APIRequester('https://bombay-lcd.terra.dev/');
+const feeGrant = new FeeGrantAPI(c);
+
+describe('FeeGrantAPI', () => {
+  it('allowances', async () => {
+    const res = await feeGrant.allowances(
+      'terra1p204wtykwke52hcyt6vdh630725rdayczyzcvz'
+    );
+
+    expect(res.allowances[0]).toMatchObject({
+      granter: expect.any(String),
+      grantee: expect.any(String),
+    });
+
+    const allowanceData = res.allowances[0].allowance.toData();
+    expect(allowanceData['@type']).toMatch(/cosmos.feegrant.v1beta1/g);
+
+    expect(res.pagination).not.toBeUndefined();
+  });
+
+  describe('allowance', () => {
+    it('allowance exist', async () => {
+      const res = await feeGrant.allowance(
+        'terra13ggppncs97f4cl90fvxqelflg0upedd0n7rnd3',
+        'terra1p204wtykwke52hcyt6vdh630725rdayczyzcvz'
+      );
+
+      const allowanceData = res.toData();
+      expect(allowanceData['@type']).toMatch(/cosmos.feegrant.v1beta1/g);
+    });
+
+    it('allowance not exist', async () => {
+      expect(
+        feeGrant.allowance(
+          'terra1p204wtykwke52hcyt6vdh630725rdayczyzcvz',
+          'terra13ggppncs97f4cl90fvxqelflg0upedd0n7rnd3'
+        )
+      ).rejects.toThrow();
+    });
+  });
+});

src/client/lcd/api/FeeGrantAPI.ts

@@ -0,0 +1,51 @@
+import { AccAddress } from '../../../core';
+import { BaseAPI } from './BaseAPI';
+import { Allowance } from '../../../core/feegrant/allowances';
+import { Pagination, PaginationOptions } from '../APIRequester';
+
+export class FeeGrantAPI extends BaseAPI {
+  public async allowances(
+    grantee: AccAddress,
+    params: Partial<PaginationOptions> = {}
+  ): Promise<{
+    allowances: {
+      granter: AccAddress;
+      grantee: AccAddress;
+      allowance: Allowance;
+    }[];
+    pagination: Pagination;
+  }> {
+    return this.c
+      .get<{
+        allowances: {
+          granter: AccAddress;
+          grantee: AccAddress;
+          allowance: Allowance.Data;
+        }[];
+        pagination: Pagination;
+      }>(`/cosmos/feegrant/v1beta1/allowances/${grantee}`, params)
+      .then(d => ({
+        allowances: d.allowances.map(allowance => ({
+          granter: allowance.granter,
+          grantee: allowance.grantee,
+          allowance: Allowance.fromData(allowance.allowance),
+        })),
+        pagination: d.pagination,
+      }));
+  }
+
+  public async allowance(
+    granter: AccAddress,
+    grantee: AccAddress
+  ): Promise<Allowance> {
+    return this.c
+      .get<{
+        allowance: {
+          granter: AccAddress;
+          grantee: AccAddress;
+          allowance: Allowance.Data;
+        };
+      }>(`/cosmos/feegrant/v1beta1/allowance/${granter}/${grantee}`)
+      .then(d => Allowance.fromData(d.allowance.allowance));
+  }
+}

src/client/lcd/api/index.ts

@@ -1,6 +1,7 @@
 export * from './AuthAPI';
 export * from './BankAPI';
 export * from './DistributionAPI';
+export * from './FeeGrantAPI';
 export * from './GovAPI';
 export * from './MarketAPI';
 export * from './AuthzAPI';