io.knotx.mocks.adapter.MockServiceHandler.java Source code

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Here is the source code for io.knotx.mocks.adapter.MockServiceHandler.java

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/*
 * Copyright (C) 2016 Cognifide Limited
 *
 * 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 io.knotx.mocks.adapter;

import io.vertx.core.Handler;
import io.vertx.core.MultiMap;
import io.vertx.core.Vertx;
import io.vertx.core.http.impl.MimeMapping;
import io.vertx.core.json.JsonObject;
import io.vertx.core.logging.Logger;
import io.vertx.core.logging.LoggerFactory;
import io.vertx.ext.web.RoutingContext;
import java.io.File;
import java.util.Optional;
import org.apache.commons.lang3.StringUtils;
import rx.functions.Action0;
import rx.functions.Action2;

public class MockServiceHandler implements Handler<RoutingContext> {

    private static final String SEPARATOR = "/";

    private static final String DEFAULT_MIME = "text/plain";
    private static final Logger LOGGER = LoggerFactory.getLogger(RoutingContext.class);
    private final Vertx vertx;
    private final JsonObject delayPerPath;
    private Action2<RoutingContext, String> bodyProcessor;
    private String catalogue;
    private long delayAllMs;

    public MockServiceHandler(String catalogue, Vertx vertx, long delayAllMs, JsonObject delayPerPath) {
        this.catalogue = catalogue;
        this.vertx = vertx;
        this.delayAllMs = delayAllMs;
        this.delayPerPath = delayPerPath;
    }

    public MockServiceHandler withBodyProcessor(Action2<RoutingContext, String> bodyProcessor) {
        this.bodyProcessor = bodyProcessor;
        return this;
    }

    @Override
    public void handle(RoutingContext context) {
        String resourcePath = getFilePath(context);
        String contentType = getContentType(context);
        String modifiedResponseStatusCode = getStatusCode(context);

        vertx.fileSystem().readFile(resourcePath, ar -> {
            if (ar.succeeded()) {
                String mockData = ar.result().toString();
                if (bodyProcessor != null) {
                    bodyProcessor.call(context, mockData);
                } else {
                    generateResponse(context.request().path(), () -> {
                        context.response().putHeader("Content-Type", contentType);
                        context.response()
                                .setStatusCode(StringUtils.isNotBlank(modifiedResponseStatusCode)
                                        ? Integer.valueOf(modifiedResponseStatusCode)
                                        : 200)
                                .end(mockData);
                    });
                }
            } else {
                LOGGER.error("Unable to read file. {}", ar.cause());
                context.fail(500);
            }
        });
    }

    private long getDelay(String path) {
        if (delayAllMs > 0) {
            return delayAllMs;
        } else {
            long delay = delayPerPath.getJsonObject(path, new JsonObject()).getLong("delayMs", delayAllMs);
            return delay > 0 ? delay : 0L;
        }
    }

    private void generateResponse(String path, Action0 action) {
        long delay = getDelay(path);
        if (delay > 0) {
            LOGGER.info("Delaying response for path {} by {} ms", path, delay);
            vertx.setTimer(delay, timerId -> action.call());
        } else {
            action.call();
        }
    }

    private String getStatusCode(RoutingContext context) {
        MultiMap queryParams = context.request().params();
        return queryParams.get("statusCode");
    }

    private String getContentType(RoutingContext context) {
        return Optional.ofNullable(MimeMapping.getMimeTypeForFilename(context.request().path()))
                .orElse(DEFAULT_MIME);
    }

    private String getFilePath(RoutingContext context) {
        return catalogue + File.separator + StringUtils.substringAfterLast(context.request().path(), SEPARATOR);
    }

}