org.hyperledger.fabric.client.ChaincodeEventsBuilder Maven / Gradle / Ivy

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/*
 * Copyright 2021 IBM All Rights Reserved.
 *
 * SPDX-License-Identifier: Apache-2.0
 */

package org.hyperledger.fabric.client;

import com.google.protobuf.ByteString;
import java.util.Objects;
import org.hyperledger.fabric.protos.gateway.SignedChaincodeEventsRequest;

final class ChaincodeEventsBuilder implements ChaincodeEventsRequest.Builder {
    private final GatewayClient client;
    private final SigningIdentity signingIdentity;
    private final String channelName;
    private final String chaincodeName;
    private final StartPositionBuilder startPositionBuilder = new StartPositionBuilder();
    private String afterTransactionId;

    ChaincodeEventsBuilder(
            final GatewayClient client,
            final SigningIdentity signingIdentity,
            final String channelName,
            final String chaincodeName) {
        Objects.requireNonNull(channelName, "channel name");
        Objects.requireNonNull(chaincodeName, "chaincode name");

        this.client = client;
        this.signingIdentity = signingIdentity;
        this.channelName = channelName;
        this.chaincodeName = chaincodeName;
    }

    @Override
    public ChaincodeEventsRequest.Builder startBlock(final long blockNumber) {
        startPositionBuilder.startBlock(blockNumber);
        return this;
    }

    @Override
    public ChaincodeEventsRequest.Builder checkpoint(final Checkpoint checkpoint) {
        checkpoint.getBlockNumber().ifPresent(startPositionBuilder::startBlock);
        this.afterTransactionId = checkpoint.getTransactionId().orElse(null);
        return this;
    }

    @Override
    public ChaincodeEventsRequest build() {
        SignedChaincodeEventsRequest signedRequest = newSignedChaincodeEventsRequestProto();
        return new ChaincodeEventsRequestImpl(client, signingIdentity, signedRequest);
    }

    private SignedChaincodeEventsRequest newSignedChaincodeEventsRequestProto() {
        org.hyperledger.fabric.protos.gateway.ChaincodeEventsRequest request = newChaincodeEventsRequestProto();
        return SignedChaincodeEventsRequest.newBuilder()
                .setRequest(request.toByteString())
                .build();
    }

    private org.hyperledger.fabric.protos.gateway.ChaincodeEventsRequest newChaincodeEventsRequestProto() {
        ByteString creator = ByteString.copyFrom(signingIdentity.getCreator());
        org.hyperledger.fabric.protos.gateway.ChaincodeEventsRequest.Builder builder =
                org.hyperledger.fabric.protos.gateway.ChaincodeEventsRequest.newBuilder()
                        .setChannelId(channelName)
                        .setChaincodeId(chaincodeName)
                        .setIdentity(creator)
                        .setStartPosition(startPositionBuilder.build());
        if (afterTransactionId != null) {
            builder.setAfterTransactionId(afterTransactionId);
        }
        return builder.build();
    }
}