Help Center/ Web3 Node Engine Service/ Developer Guide/ TRON Node Engine/ gRPC Request Examples/ Using TridentSDK to Send gRPC Requests
Updated on 2024-11-14 GMT+08:00
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Using TridentSDK to Send gRPC Requests

TridentSDK of the version 0.7.0 and earlier is supported. Currently, you cannot send gRPC requests using TLS. Therefore, perform node interconnection with Java reflection according to the sample code.

Download the certificate on the node details page and place the ca.crt certificate in the package under the project directory.

Configure the gRPC endpoint in the SDK. The sample code is as follows: 
import io.gRPC.*;
import io.gRPC.stub.MetadataUtils;
import org.tron.trident.api.WalletgRPC;
import org.tron.trident.api.WalletSoliditygRPC;
import org.tron.trident.core.ApiWrapper;
import org.tron.trident.core.exceptions.IllegalException;
import org.tron.trident.core.key.KeyPair;

import java.io.File;
import java.io.IOException;
import java.lang.reflect.Field;

public class Main {
    public static void main(String[] args) throws IllegalException, IOException, NoSuchFieldException,
            IllegalAccessException {
        String gRPCEndpoint = "your-gRPC-endpoint";
        String gRPCSolidityEndpoint = "your-gRPCsolidity-endpoint";
        String credential = "your-credential";
        String hexPrivateKey = "your-hex-private-key";
        ApiWrapper wrapper = new ApiWrapper(gRPCEndpoint, gRPCSolidityEndpoint, hexPrivateKey, credential);
        // modify wallet channel through reflex
        ChannelCredentials creds = TlsChannelCredentials.newBuilder()
                .trustManager(new File("your-ca.crt-file-path"))
                .build();
        ManagedChannel channel = gRPC.newChannelBuilder(gRPCEndpoint, creds)
                .build();
        Metadata header = new Metadata();
        Metadata.Key<String> key = Metadata.Key.of("TRON-PRO-API-KEY", Metadata.ASCII_STRING_MARSHALLER);
        header.put(key, credential);
        setField(ApiWrapper.class, wrapper, "channel", channel);
        setField(ApiWrapper.class, wrapper, "blockingStub", MetadataUtils.attachHeaders(WalletgRPC.newBlockingStub(channel), header));
        // modify walletsolidity channel through reflex
        ManagedChannel channelSolidity = gRPC.newChannelBuilder(gRPCSolidityEndpoint, creds)
                .build();
        setField(ApiWrapper.class, wrapper, "channelSolidity", channelSolidity);
        setField(ApiWrapper.class, wrapper, "blockingStubSolidity", MetadataUtils.attachHeaders(WalletSoliditygRPC.newBlockingStub(channelSolidity), header));
        // getNowBlock & getNowBlockSolidity test
        System.out.println(wrapper.getNowBlock());
        System.out.println(wrapper.getNowBlockSolidity());
        System.out.println("finish");
    }
    private static void setField(Class clazz, Object obj, String fieldName, Object value) throws NoSuchFieldException,
            IllegalAccessException {
        Field field = clazz.getDeclaredField(fieldName);
        field.setAccessible(true);
        field.set(obj, value);
    }
}

Response example

Parent topic: gRPC Request Examples