com.sap.core.odata.testutil.tool.core.SupaController.java Source code

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/*******************************************************************************
 * Copyright 2013 SAP AG
 * 
 * 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 com.sap.core.odata.testutil.tool.core;

import java.io.IOException;
import java.net.URI;
import java.net.URISyntaxException;

import org.apache.http.HttpEntity;
import org.apache.http.HttpHost;
import org.apache.http.HttpResponse;
import org.apache.http.auth.AuthScope;
import org.apache.http.auth.UsernamePasswordCredentials;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpRequestBase;
import org.apache.http.conn.params.ConnRoutePNames;
import org.apache.http.impl.client.DefaultHttpClient;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.sap.core.odata.testutil.helper.StringHelper;

public class SupaController {

    private static final Logger LOG = LoggerFactory.getLogger(SupaController.class);

    private static final String BEGIN = "/supa/startMeasurement";
    private static final String STOP = "/supa/stopMeasurement";
    private static final String NEXT_STEP = "/supa/nextStep";
    //  private static final String FIRST_STEP = "/supa/firstStep";
    private static final String CURRENT_STEP = "/supa/currentStep";
    //  private static final String RESET_DATA_PROVIDERS = "/supa/resetDataProviders";
    private static final String GENERATE_EXCEL = "/supa/generateExcel";
    private static final String GET_RESULT_DIR = "/supa/getResultDir";
    private static final String INDEX = "/supa/index";
    private static final String EXIT = "/supa/exit";
    //  private static final String GET_CURRENT_VALUES = "/supa/getCurrentValues";

    private final URI baseUri;

    protected DefaultHttpClient httpClient;
    protected CallerConfig config;

    public SupaController(final String baseUri) throws URISyntaxException {
        this(baseUri, false);
    }

    public SupaController(final String baseUri, final boolean validateServerStarted) throws URISyntaxException {
        if (baseUri.endsWith("/")) {
            config = new CallerConfig(baseUri.substring(0, baseUri.length() - 1));
        } else {
            config = new CallerConfig(baseUri);
        }
        this.baseUri = config.getBaseUri();

        init();
        if (validateServerStarted && !supaServerRunning()) {
            throw new IllegalStateException(
                    "No SUPA server is reachable at '" + this.baseUri.toASCIIString() + "'.");
        }
    }

    private void init() {
        httpClient = new DefaultHttpClient();
        if (config.isProxySet()) {
            initProxy();
        }

        if (config.isBasicAuthCredentialsSet()) {
            final URI baseUri = config.getBaseUri();
            httpClient.getCredentialsProvider().setCredentials(new AuthScope(baseUri.getHost(), baseUri.getPort()),
                    new UsernamePasswordCredentials(config.getBasicAuthCredentials()));
        }
    }

    private void initProxy() throws IllegalArgumentException {
        final String proxyUrl = config.getProxy();
        final String[] hostAndPort = proxyUrl.split(":");
        if (hostAndPort.length != 2) {
            throw new IllegalArgumentException("Unable to parse proxy url. Supported format is 'hostname:port''");
        }
        final String host = hostAndPort[0];
        int port;
        try {
            port = Integer.parseInt(hostAndPort[1]);
        } catch (final NumberFormatException e) {
            throw new IllegalArgumentException(
                    "Unable to parse proxy url because port is Not a Number. Supported format is 'hostname:port''",
                    e);
        }
        final HttpHost proxy = new HttpHost(host, port);
        LOG.info("Use proxy '{}:{}'", proxy.getHostName(), proxy.getPort());
        httpClient.getParams().setParameter(ConnRoutePNames.DEFAULT_PROXY, proxy);
    }

    public boolean supaServerRunning() {
        return call(INDEX).matches("<html>.*</html>");
    }

    public void begin() {
        call(BEGIN);
    }

    public String stop() {
        return call(STOP);
    }

    public String getCurrentStepName() {
        return call(CURRENT_STEP);
    }

    public void nextStep() {
        call(NEXT_STEP);
    }

    public String finish() {
        call(GENERATE_EXCEL);
        return call(GET_RESULT_DIR);
    }

    public void shutdownSupaServer() {
        call(EXIT);
    }

    private String call(final String supaCommand) {
        HttpRequestBase request = null;
        try {
            request = new HttpGet(baseUri + supaCommand);

            LOG.debug("Call for request line '{}'", request.getRequestLine());

            final HttpHost targetHost = new HttpHost(baseUri.getHost(), baseUri.getPort());
            final HttpResponse response = httpClient.execute(targetHost, request);

            //
            return extractSupaInformation(response.getEntity());
        } catch (final IOException e) {
            LOG.debug("Got exception for calling supa command '" + supaCommand + "'.");
            return "Exception";
        } finally {
            if (request != null) {
                request.releaseConnection();
            }
        }
    }

    private String extractSupaInformation(final HttpEntity entity) throws IllegalStateException, IOException {
        String rawContent = StringHelper.httpEntityToString(entity);
        if (rawContent == null) {
            return null;
        }
        //
        int startIndex = 0;
        if (rawContent.startsWith("<html><body>")) {
            startIndex = 12;
        }
        //
        int endIndex = rawContent.indexOf("<br /><p />");
        if (endIndex < 0 || endIndex < startIndex) {
            endIndex = rawContent.length();
        }
        //
        String supaContent = rawContent.substring(startIndex, endIndex);
        return supaContent;
    }
}