feat(sdk-coin-tao): add netuid validation

modules/abstract-substrate/src/lib/transactionBuilder.ts

@@ -256,6 +256,17 @@ export abstract class TransactionBuilder extends BaseTransactionBuilder {
     }
   }
 
+  /**
+   * Helper method to check whether netuid is 0 (only root network is supported now)
+   * @param {string} netduid of the subnet
+   */
+  public validateNetuid(netduid: string) {
+    const netuidBigNumber = new BigNumber(netduid);
+    if (!netuidBigNumber.isZero()) {
+      throw new BuildTransactionError('Only root network netuid(0) is supported');
+    }
+  }
+
   /** @inheritdoc */
   validateKey({ key }: BaseKey): void {
     let isValidPrivateKeyFromBytes;

modules/sdk-coin-tao/src/lib/stakingBuilder.ts

@@ -68,6 +68,7 @@ export class StakingBuilder extends TransactionBuilder {
    * @returns {StakingBuilder} This staking builder.
    */
   netuid(netuid: string): this {
+    this.validateNetuid(netuid);
     this._netuid = netuid;
     return this;
   }

modules/sdk-coin-tao/src/lib/unstakeBuilder.ts

@@ -71,6 +71,7 @@ export class UnstakeBuilder extends TransactionBuilder {
    * @returns {UnstakeBuilder} This unstaking builder
    */
   netuid(netuid: string): this {
+    this.validateNetuid(netuid);
     this._netuid = netuid;
     return this;
   }

modules/sdk-coin-tao/test/unit/transactionBuilder/stakingBuilder.ts

@@ -38,6 +38,16 @@ describe('Tao Stake Builder', function () {
       should.doesNotThrow(() => builder.hotkey({ address: '5FCPTnjevGqAuTttetBy4a24Ej3pH9fiQ8fmvP1ZkrVsLUoT' }));
       SinonAssert.calledTwice(spyValidateAddress);
     });
+
+    it('should validate netuid', function () {
+      const spyValidateNetuid = spy(builder, 'validateNetuid');
+      assert.throws(
+        () => builder.netuid('1'),
+        (e: Error) => e.message === 'Only root network netuid(0) is supported'
+      );
+      should.doesNotThrow(() => builder.netuid('0'));
+      SinonAssert.calledTwice(spyValidateNetuid);
+    });
   });
 
   describe('build stake transaction', function () {

modules/sdk-coin-tao/test/unit/transactionBuilder/unstakeBuilder.ts

@@ -37,6 +37,16 @@ describe('Tao Unstake Builder', function () {
       should.doesNotThrow(() => builder.hotkey({ address: '5FCPTnjevGqAuTttetBy4a24Ej3pH9fiQ8fmvP1ZkrVsLUoT' }));
       SinonAssert.calledTwice(spyValidateAddress);
     });
+
+    it('should validate netuid', function () {
+      const spyValidateNetuid = spy(builder, 'validateNetuid');
+      assert.throws(
+        () => builder.netuid('1'),
+        (e: Error) => e.message === 'Only root network netuid(0) is supported'
+      );
+      should.doesNotThrow(() => builder.netuid('0'));
+      SinonAssert.calledTwice(spyValidateNetuid);
+    });
   });
 
   describe('build unstake transaction', function () {