co.cask.cdap.cli.command.app.CreateAppCommand.java Source code

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Here is the source code for co.cask.cdap.cli.command.app.CreateAppCommand.java

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/*
 * Copyright  2012-2015 Cask Data, Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */

package co.cask.cdap.cli.command.app;

import co.cask.cdap.api.artifact.ArtifactScope;
import co.cask.cdap.cli.ArgumentName;
import co.cask.cdap.cli.CLIConfig;
import co.cask.cdap.cli.ElementType;
import co.cask.cdap.cli.english.Article;
import co.cask.cdap.cli.english.Fragment;
import co.cask.cdap.cli.util.AbstractAuthCommand;
import co.cask.cdap.cli.util.FilePathResolver;
import co.cask.cdap.client.ApplicationClient;
import co.cask.cdap.proto.Id;
import co.cask.cdap.proto.artifact.AppRequest;
import co.cask.cdap.proto.artifact.ArtifactSummary;
import co.cask.common.cli.Arguments;
import com.google.gson.Gson;
import com.google.gson.JsonObject;
import com.google.gson.reflect.TypeToken;
import com.google.inject.Inject;

import java.io.File;
import java.io.FileReader;
import java.io.PrintStream;
import java.lang.reflect.Type;

/**
 * Deploys an application from an existing artifact.
 */
public class CreateAppCommand extends AbstractAuthCommand {
    private static final Type configType = new TypeToken<AppRequest<JsonObject>>() {
    }.getType();
    private static final Gson GSON = new Gson();
    private final ApplicationClient applicationClient;
    private final FilePathResolver resolver;

    @Inject
    public CreateAppCommand(ApplicationClient applicationClient, FilePathResolver resolver, CLIConfig cliConfig) {
        super(cliConfig);
        this.applicationClient = applicationClient;
        this.resolver = resolver;
    }

    @Override
    public void perform(Arguments arguments, PrintStream output) throws Exception {
        String appName = arguments.get(ArgumentName.APP.toString());
        Id.Application appId = Id.Application.from(cliConfig.getCurrentNamespace(), appName);

        String artifactName = arguments.get(ArgumentName.ARTIFACT_NAME.toString());
        String artifactVersion = arguments.get(ArgumentName.ARTIFACT_VERSION.toString());
        ArtifactScope artifactScope = ArtifactScope
                .valueOf(arguments.get(ArgumentName.SCOPE.toString()).toUpperCase());
        ArtifactSummary artifact = new ArtifactSummary(artifactName, artifactVersion, artifactScope);

        JsonObject config = new JsonObject();
        String configPath = arguments.getOptional(ArgumentName.APP_CONFIG_FILE.toString());
        if (configPath != null) {
            File configFile = resolver.resolvePathToFile(configPath);
            try (FileReader reader = new FileReader(configFile)) {
                AppRequest<JsonObject> appRequest = GSON.fromJson(reader, configType);
                config = appRequest.getConfig();
            }
        }

        AppRequest<JsonObject> appRequest = new AppRequest<>(artifact, config);
        applicationClient.deploy(appId, appRequest);
        output.println("Successfully created application");
    }

    @Override
    public String getPattern() {
        return String.format("create app <%s> <%s> <%s> <%s> [<%s>]", ArgumentName.APP, ArgumentName.ARTIFACT_NAME,
                ArgumentName.ARTIFACT_VERSION, ArgumentName.SCOPE, ArgumentName.APP_CONFIG_FILE);
    }

    @Override
    public String getDescription() {
        return String.format("Creates %s from an artifact, optionally using a configuration. If a configuration is "
                + "needed, it must be given as a file whose contents are a JSON object containing the application config. "
                + "For example, the file contents could contain: '{ \"config\": { \"stream\": \"purchases\" } }'. In this case, "
                + "the application would receive '{ \"stream\": \"purchases\" }' as its config object.",
                Fragment.of(Article.A, ElementType.APP.getName()));
    }
}