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A client-side Java library to interact with Scalar DL network.
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package com.scalar.dl.client.tool;

import com.google.common.annotations.VisibleForTesting;
import com.moandjiezana.toml.Toml;
import com.moandjiezana.toml.TomlWriter;
import com.scalar.dl.client.config.ClientConfig;
import com.scalar.dl.client.config.GatewayClientConfig;
import com.scalar.dl.client.exception.ClientException;
import com.scalar.dl.client.service.ClientService;
import com.scalar.dl.client.service.ClientServiceFactory;
import java.io.File;
import java.io.FileOutputStream;
import java.io.OutputStreamWriter;
import java.nio.charset.StandardCharsets;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.Callable;
import picocli.CommandLine;
import picocli.CommandLine.Command;

@Command(name = "register-functions", description = "Register specified functions.")
public class FunctionsRegistration extends CommonOptions implements Callable {
  static final String REGISTRATION_FAILED_FUNCTIONS_TOML_FILE =
      "registration-failed-functions.toml";
  static final String TOML_TABLES_NAME = "functions";

  @CommandLine.Option(
      names = {"--functions-file"},
      required = true,
      paramLabel = "FUNCTIONS_FILE",
      description = "A file including functions to register in TOML format.")
  private String functionsFile;

  public static void main(String[] args) {
    int exitCode =
        new CommandLine(new com.scalar.dl.client.tool.FunctionsRegistration()).execute(args);
    System.exit(exitCode);
  }

  @Override
  public Integer call() throws Exception {
    ClientServiceFactory factory = new ClientServiceFactory();
    File functionsFileObj = new File(functionsFile);
    return call(factory, functionsFileObj);
  }

  @VisibleForTesting
  Integer call(ClientServiceFactory factory, File functionsFile) throws Exception {
    ClientService service =
        useGateway
            ? factory.create(new GatewayClientConfig(new File(properties)))
            : factory.create(new ClientConfig(new File(properties)));
    return call(factory, service, functionsFile);
  }

  @VisibleForTesting
  Integer call(ClientServiceFactory factory, ClientService service, File functionsFile)
      throws Exception {
    List succeeded = new ArrayList();
    List failed = new ArrayList();

    try {
      new Toml()
          .read(functionsFile)
          .getTables(TOML_TABLES_NAME)
          .forEach(
              each -> {
                String id = each.getString("function-id");
                String binaryName = each.getString("function-binary-name");
                String classFile = each.getString("function-class-file");

                // All of them are required values to register a function.
                // Thus, the malformed table is skipped if one of them doesn't exist.
                if (id == null || binaryName == null || classFile == null) {
                  failed.add(each);
                  return;
                }

                try {
                  System.out.printf("Register function %s as %s%n", binaryName, id);
                  service.registerFunction(id, binaryName, classFile);
                  Common.printOutput(null);
                  succeeded.add(each);
                } catch (ClientException e) {
                  Common.printError(e);
                  printStackTrace(e);
                  failed.add(each);
                }
              });
    } finally {
      factory.close();
    }

    System.out.printf("Registration succeeded: %d%n", succeeded.size());
    System.out.printf("Registration failed: %d%n", failed.size());

    if (!failed.isEmpty()) {
      try (OutputStreamWriter fileWriter =
          new OutputStreamWriter(
              new FileOutputStream(REGISTRATION_FAILED_FUNCTIONS_TOML_FILE),
              StandardCharsets.UTF_8)) {
        TomlWriter tomlWriter = new TomlWriter();

        for (Toml toml : failed) {
          fileWriter.write(String.format("[[%s]]%n", TOML_TABLES_NAME));
          tomlWriter.write(toml.toMap(), fileWriter);
        }
      }

      System.out.printf(
          "%nFunctions that failed to be registered are written to %s.%n",
          REGISTRATION_FAILED_FUNCTIONS_TOML_FILE);

      return 1;
    }

    return 0;
  }
}