rocketmq-connect-runtime/src/main/java/org/apache/rocketmq/connect/runtime/rest/RestHandler.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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 org.apache.rocketmq.connect.runtime.rest;

import com.alibaba.fastjson.JSON;
import io.javalin.Context;
import io.javalin.Javalin;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;

import org.apache.rocketmq.connect.runtime.controller.AbstractConnectController;
import org.apache.rocketmq.connect.runtime.common.ConnectKeyValue;
import org.apache.rocketmq.connect.runtime.common.LoggerName;
import org.apache.rocketmq.connect.runtime.connectorwrapper.WorkerConnector;
import org.apache.rocketmq.connect.runtime.connectorwrapper.WorkerTask;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * A rest handler to process http request.
 */
public class RestHandler {

    private static final Logger log = LoggerFactory.getLogger(LoggerName.ROCKETMQ_RUNTIME);

    private final AbstractConnectController connectController;

    private static final String CONNECTOR_CONFIGS = "connectorConfigs";

    private static final String TASK_CONFIGS = "taskConfigs";

    /** connector plugin resource */
    private ConnectorPluginsResource pluginsResource;
    public RestHandler(AbstractConnectController connectController) {
        this.connectController = connectController;
        pluginsResource = new ConnectorPluginsResource(connectController);

        Javalin app = Javalin.create();
        app.enableCaseSensitiveUrls();
        app = app.start(connectController.getConnectConfig().getHttpPort());
        app.get("/connectors/stopAll", this::handleStopAllConnector);
        app.get("/connectors/pauseAll", this::handlePauseAllConnector);
        app.get("/connectors/resumeAll", this::handleResumeAllConnector);
        app.get("/connectors/enableAll", this::handleEnableAllConnector);
        app.get("/connectors/disableAll", this::handleDisableAllConnector);
        app.get("/connectors/:connectorName", this::handleCreateConnector);
        app.post("/connectors/:connectorName", this::handleCreateConnector);
        app.get("/connectors/:connectorName/config", this::handleQueryConnectorConfig);
        app.get("/connectors/:connectorName/status", this::handleQueryConnectorStatus);
        app.get("/connectors/:connectorName/stop", this::handleStopConnector);
        app.get("/connectors/:connectorName/pause", this::handlePauseConnector);
        app.get("/connectors/:connectorName/resume", this::handleResumeConnector);
        app.get("/connectors/:connectorName/enable", this::handleEnableConnector);
        app.get("/connectors/:connectorName/disable", this::handleDisableConnector);
        app.get("/getClusterInfo", this::getClusterInfo);
        app.get("/getConfigInfo", this::getConfigInfo);
        app.get("/getAllocatedConnectors", this::getAllocatedConnectors);
        app.get("/getAllocatedTasks", this::getAllocatedTasks);

        /**plugin resource handler*/
        app.get("/plugin/reload", context -> pluginsResource.reloadPlugins(context));
        app.get("/plugin/list", context -> pluginsResource.listConnectorPlugins(context));
        app.get("/plugin/config", context -> pluginsResource.getConnectorConfigDef(context));
        app.get("/plugin/config/validate", context -> pluginsResource.validateConfigs(context));

    }


    private void getAllocatedConnectors(Context context) {
        Set<WorkerConnector> workerConnectors = connectController.getWorker().getWorkingConnectors();
        Map<String, ConnectKeyValue> connectors = new HashMap<>();
        for (WorkerConnector workerConnector : workerConnectors) {
            connectors.put(workerConnector.getConnectorName(), workerConnector.getKeyValue());
        }
        context.result(JSON.toJSONString(connectors));
    }



    private void getAllocatedTasks(Context context) {
        StringBuilder sb = new StringBuilder();

        Set<Runnable> allErrorTasks = new HashSet<>();
        allErrorTasks.addAll(connectController.getWorker().getErrorTasks());
        allErrorTasks.addAll(connectController.getWorker().getCleanedErrorTasks());

        Set<Runnable> allStoppedTasks = new HashSet<>();
        allStoppedTasks.addAll(connectController.getWorker().getStoppedTasks());
        allStoppedTasks.addAll(connectController.getWorker().getCleanedStoppedTasks());

        Map<String, Object> formatter = new HashMap<>();
        formatter.put("pendingTasks", convertWorkerTaskToString(connectController.getWorker().getPendingTasks()));
        formatter.put("runningTasks",  convertWorkerTaskToString(connectController.getWorker().getWorkingTasks()));
        formatter.put("stoppingTasks",  convertWorkerTaskToString(connectController.getWorker().getStoppingTasks()));
        formatter.put("stoppedTasks",  convertWorkerTaskToString(allStoppedTasks));
        formatter.put("errorTasks",  convertWorkerTaskToString(allErrorTasks));

        context.result(JSON.toJSONString(formatter));
    }

    private void getConfigInfo(Context context) {

        Map<String, ConnectKeyValue> connectorConfigs = connectController.getConfigManagementService().getConnectorConfigs();
        Map<String, List<ConnectKeyValue>> taskConfigs = connectController.getConfigManagementService().getTaskConfigs();

        Map<String, Map> formatter = new HashMap<>();
        formatter.put(CONNECTOR_CONFIGS, connectorConfigs);
        formatter.put(TASK_CONFIGS, taskConfigs);

        context.result(JSON.toJSONString(formatter));
    }

    private void getClusterInfo(Context context) {
        context.result(JSON.toJSONString(connectController.getClusterManagementService().getAllAliveWorkers()));
    }

    private void handleCreateConnector(Context context) {
        String connectorName = context.pathParam("connectorName");
        String arg;
        if (context.req.getMethod().equals("POST")) {
            arg = context.body();
        } else {
            arg = context.req.getParameter("config");
        }
        if (arg == null) {
            context.result("failed! query param 'config' is required ");
            return;
        }
        log.info("config: {}", arg);
        Map keyValue = JSON.parseObject(arg, Map.class);
        ConnectKeyValue configs = new ConnectKeyValue();
        for (Object key : keyValue.keySet()) {
            configs.put((String) key, keyValue.get(key).toString());
        }
        try {

            String result = connectController.getConfigManagementService().putConnectorConfig(connectorName, configs);
            if (result != null && result.length() > 0) {
                context.result(result);
            } else {
                context.result("success");
            }
        } catch (Exception e) {
            log.error("Handle createConnector error .", e);
            context.result("failed:" + e.getMessage());
        }
    }

    private void handleQueryConnectorConfig(Context context) {

        String connectorName = context.pathParam("connectorName");

        Map<String, ConnectKeyValue> connectorConfigs = connectController.getConfigManagementService().getConnectorConfigs();
        Map<String, List<ConnectKeyValue>> taskConfigs = connectController.getConfigManagementService().getTaskConfigs();
        StringBuilder sb = new StringBuilder();
        sb.append("ConnectorConfigs:")
            .append(JSON.toJSONString(connectorConfigs.get(connectorName)))
            .append("\n")
            .append("TaskConfigs:")
            .append(JSON.toJSONString(taskConfigs.get(connectorName)));
        context.result(sb.toString());
    }

    private void handleQueryConnectorStatus(Context context) {

        String connectorName = context.pathParam("connectorName");
        Map<String, ConnectKeyValue> connectorConfigs = connectController.getConfigManagementService().getConnectorConfigs();

        if (connectorConfigs.containsKey(connectorName)) {
            context.result("running");
        } else {
            context.result("not running");
        }
    }

    private void handleStopConnector(Context context) {
        String connectorName = context.pathParam("connectorName");
        try {

            connectController.getConfigManagementService().removeConnectorConfig(connectorName);
            context.result("success");
        } catch (Exception e) {
            context.result("failed");
        }
    }

    private void handleStopAllConnector(Context context) {
        try {
            Map<String, ConnectKeyValue> connectorConfigs = connectController.getConfigManagementService().getConnectorConfigs();
            for (String connector : connectorConfigs.keySet()) {
                connectController.getConfigManagementService().removeConnectorConfig(connector);
            }
            context.result("success");
        } catch (Exception e) {
            context.result("failed");
        }
    }

    private void handlePauseAllConnector(Context context) {

    }

    private void handleResumeAllConnector(Context context) {

    }

    private void handleEnableAllConnector(Context context) {

    }

    private void handleDisableAllConnector(Context context) {

    }

    private void handlePauseConnector(Context context) {

    }

    private void handleResumeConnector(Context context) {

    }

    private void handleEnableConnector(Context context) {

    }

    private void handleDisableConnector(Context context) {

    }

    private Set<Object> convertWorkerTaskToString(Set<Runnable> tasks) {
        Set<Object> result = new HashSet<>();
        for (Runnable task : tasks) {
            result.add(((WorkerTask) task).currentTaskState());
        }
        return result;
    }

}