Create NexusSmartChainRelayer.js

blockchain_integration/pi_network/pi-network-interoperability/bridge-contracts/nexus-smart-chain/NexusSmartChainRelayer.js

@@ -0,0 +1,52 @@
+const Web3 = require('web3');
+const Ethers = require('ethers');
+const { ApiPromise, WsProvider } = require('@polkadot/api');
+
+class NexusSmartChainRelayer {
+  constructor(relayerContractAddress, providerUrl) {
+    this.relayerContractAddress = relayerContractAddress;
+    this.web3 = new Web3(new Web3.providers.HttpProvider(providerUrl));
+    this.ethersProvider = new Ethers.providers.JsonRpcProvider(providerUrl);
+    this.api = new ApiPromise({
+      provider: new WsProvider(providerUrl)
+    });
+  }
+
+  async relayTokens(amount, tokenAddress, userAddress) {
+    const txCount = await this.web3.eth.getTransactionCount(this.relayerContractAddress);
+    const tx = {
+      from: this.relayerContractAddress,
+      to: this.relayerContractAddress,
+      value: '0',
+      gas: '20000',
+      gasPrice: '20',
+      nonce: txCount,
+      data: `0x${this.encodeRelayTokens(amount, tokenAddress, userAddress)}`
+    };
+    const signedTx = await this.ethersProvider.signTransaction(tx, '0x1234567890abcdef');
+    await this.ethersProvider.sendTransaction(signedTx);
+  }
+
+  async getRelayedTokens(tokenAddress, userAddress) {
+    return this.api.query.nexusSmartChainRelayer.relayedTokens(tokenAddress, userAddress);
+  }
+
+    encodeRelayTokens(amount, tokenAddress, userAddress) {
+    return this.web3.eth.abi.encodeFunctionCall({
+      name: 'relayTokens',
+      type: 'function',
+      inputs: [{
+        type: 'uint256',
+        name: 'amount'
+      }, {
+        type: 'address',
+        name: 'tokenAddress'
+      }, {
+        type: 'address',
+        name: 'userAddress'
+      }]
+    }, [amount, tokenAddress, userAddress]);
+  }
+}
+
+module.exports = NexusSmartChainRelayer;