Initialize concordium client on NodeJs (NestJs)

Node
1

Hey I’m trying to initialize concordium client and getting this error:

[Nest] 19092  - 01/07/2025, 5:27:27 PM   ERROR [TraceService] Failed to initialize Concordium client
[Nest] 19092  - 01/07/2025, 5:27:27 PM   ERROR [TraceService] RpcError: No connection established. Last error: connect ETIMEDOUT 34.36.245.204:20001 (2025-01-07T16:27:27.506Z)

Code: UNAVAILABLE
Method: concordium.v2.Queries/GetInstanceInfo
C:\Users\emi_m\OneDrive\Desktop\posao\mithras\mithras-be\node_modules\@protobuf-ts\grpc-transport\build\commonjs\grpc-transport.js:37
                const e = new runtime_rpc_1.RpcError(err.details, grpc_js_1.status[err.code], util_1.metadataFromGrpc(err.metadata));
                          ^

RpcError: No connection established. Last error: connect ETIMEDOUT 34.36.245.204:20001 (2025-01-07T16:27:27.506Z)

this is my function

 constructor() {
    this.loadSchema();
  }

 async onModuleInit() {
    await this.initializeDependencies();
    await this.initializeClient();
  }

private async initializeDependencies() {
    try {
      // Dynamically import SDK
      const webSdk = await import('@concordium/web-sdk');
      const nodeClient = await import('@concordium/web-sdk/nodejs');

      this.SDK = webSdk;
      this.nodeClient = nodeClient;

      this.logger.log('SDK dependencies loaded successfully');
    } catch (error) {
      this.logger.error('Failed to load SDK dependencies', error);
      throw error;
    }
  }

 private loadSchema() {
    try {
      const schemaPath = join(
        __dirname,
        '../../src/concordium/module-schema.bs64',
      );
      const rawSchema = readFileSync(schemaPath);
      this.schema = Buffer.from(rawSchema);
    } catch (error) {
      this.logger.error('Failed to load schema', error);
      throw error;
    }
  }


private async initializeClient() {
    try {
      const nodeAddress = process.env.CONCORDIUM_NODE_ADDRESS;
      const nodePort = parseInt(process.env.CONCORDIUM_NODE_PORT || '20001');
      const contractIndex = process.env.CONCORDIUM_CONTRACT_INDEX;

      if (!nodeAddress || !contractIndex) {
        throw new Error('Missing required environment variables');
      }

      const { ConcordiumGRPCNodeClient } = this.nodeClient;

      this.client = new ConcordiumGRPCNodeClient(
        nodeAddress,
        nodePort,
        credentials.createSsl(),
        {
          timeout: 30000,
          'grpc.keepalive_time_ms': 120000,
          'grpc.keepalive_timeout_ms': 20000,
        },
      );

      // Create contract address using the new index
      const contractAddress = {
        index: BigInt(10532),
        subindex: BigInt(0),
      };

      // Test if we can access the contract
      const info = await this.client.getInstanceInfo(contractAddress);
      this.logger.log('Contract successfully connected:', info);

      this.logger.log('Concordium client initialized successfully');
    } catch (error) {
      this.logger.error('Failed to initialize Concordium client', error);
      throw error;
    }
  }

my environment virables:
CONCORDIUM_NODE_ADDRESS=grpc.testnet.concordium.com
CONCORDIUM_CONTRACT_ADDRESS=contract_address
CONCORDIUM_NODE_PORT=20001
CONCORDIUM_CONTRACT_INDEX=contract_index
CONCORDIUM_CONTRACT_SUBINDEX=0
CONCORDIUM_ADMIN_ADDRESS=admin_address

does anyone see what is why it doesn’t want to connect to testnet, sorry I’m a newby in concordium blockchain :slight_smile:

2

Dear emi159,
our public testnet node (grpc.testnet.concordium.com) uses the port 20000.