implement message router consumer

implement message router consumer

Issue-ID: CCSDK-1373
Signed-off-by: Smokowski, Kevin (ks6305) <kevin.smokowski@att.com>
Change-Id: Iea4290c5b9e9bb63f152f0605dae1e715974f217

4 files changed, 503 insertions, 0 deletions

diff --git a/message-router/consumer/provider/src/main/java/org/onap/ccsdk/sli/adaptors/messagerouter/consumer/provider/impl/AbstractBaseConsumer.java b/message-router/consumer/provider/src/main/java/org/onap/ccsdk/sli/adaptors/messagerouter/consumer/provider/impl/AbstractBaseConsumer.java
new file mode 100755
index 00000000..8937f7b9
--- /dev/null
+++ b/message-router/consumer/provider/src/main/java/org/onap/ccsdk/sli/adaptors/messagerouter/consumer/provider/impl/AbstractBaseConsumer.java
@@ -0,0 +1,207 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * openECOMP : SDN-C
+ * ================================================================================
+ * Copyright (C) 2017 - 2018 AT&T Intellectual Property. All rights
+ *                      reserved.
+ * ================================================================================
+ * 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.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.ccsdk.sli.adaptors.messagerouter.consumer.provider.impl;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.net.HttpURLConnection;
+import java.net.MalformedURLException;
+import java.net.URL;
+import java.util.Base64;
+
+import javax.net.ssl.HostnameVerifier;
+import javax.net.ssl.HttpsURLConnection;
+import javax.net.ssl.SSLSession;
+
+import org.onap.ccsdk.sli.adaptors.messagerouter.consumer.api.ConsumerApi;
+import org.onap.ccsdk.sli.adaptors.messagerouter.consumer.api.RequestHandler;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import com.google.gson.Gson;
+import com.google.gson.JsonParseException;
+
+/*
+ * java.net based client to build message router consumers
+ */
+public abstract class AbstractBaseConsumer implements ConsumerApi {
+    private static final Logger LOG = LoggerFactory.getLogger(AbstractBaseConsumer.class);
+    private static final String REQUEST_METHOD = "GET";
+
+    private final String host;
+    private final Integer connectTimeout;
+    private final Integer readTimeout;
+    private final String group;
+    private final String id;
+    private final String filter;
+    private final Integer limit;
+    private final Integer timeoutQueryParamValue;
+    private final String authorizationString;
+
+    protected RequestHandler requestHandler;
+    protected URL url;
+    protected String topic;
+    
+    public AbstractBaseConsumer(String username, String password, String host, String authentication, Integer connectTimeout, Integer readTimeout, String group, String id, String filter, Integer limit, Integer timeoutQueryParamValue) {
+	this.host = host;
+	this.connectTimeout = connectTimeout;
+	this.readTimeout = readTimeout;
+	this.group = group;
+	this.id = id;
+	this.filter = filter;
+	this.limit = limit;
+	this.timeoutQueryParamValue = timeoutQueryParamValue;
+
+	if ("basic".equals(authentication)) {
+	    if (username != null && password != null && username.length() > 0 && password.length() > 0) {
+		authorizationString = buildAuthorizationString(username, password);
+	    } else {
+		throw new IllegalStateException("Authentication is set to basic but username or password is missing");
+	    }
+	} else if ("noauth".equals(authentication)) {
+	    authorizationString = null;
+	} else {
+	    throw new IllegalStateException("Unknown authentication method: " + authentication);
+	}
+    }
+
+    protected void poll() {
+	String responseBody = performHttpOperation();
+	if (responseBody != null && !responseBody.startsWith("[]")) {
+	    LOG.info("New message was fetched from MessageRouter.");
+	    LOG.trace("Fetched message is\n{}", responseBody);
+	    try {
+		String[] requests = new Gson().fromJson(responseBody, String[].class);
+		if (requests != null) {
+		    for (String request : requests) {
+			if (request != null) {
+			    requestHandler.handleRequest(topic,request);
+			}
+		    }
+		} else {
+		    LOG.warn("Deserialization of received message results in null array.", responseBody);
+		}
+	    } catch (JsonParseException e) {
+		LOG.warn("Received message has bad format. Expected format is JSON.");
+	    }
+	} else {
+	    LOG.trace("No new message was fetched from MessageRouter.");
+	}
+    }
+
+    private String buildlUrlString(String topic) {
+	StringBuilder sb = new StringBuilder();
+	sb.append(host + "/events/" + topic + "/" + group + "/" + id);
+	sb.append("?timeout=" + timeoutQueryParamValue);
+
+	if (limit != null) {
+	    sb.append("&limit=" + limit);
+	}
+	if (filter != null) {
+	    sb.append("&filter=" + filter);
+	}
+	return sb.toString();
+    }
+
+    private String performHttpOperation() {
+	HttpURLConnection httpUrlConnection = null;
+	try {
+	    httpUrlConnection = buildHttpURLConnection(url);
+	    httpUrlConnection.setRequestMethod(REQUEST_METHOD);
+	    httpUrlConnection.connect();
+	    int status = httpUrlConnection.getResponseCode();
+	    if (status < 300) {
+		return readFromStream(httpUrlConnection.getInputStream());
+	    } else {
+		String response = readFromStream(httpUrlConnection.getErrorStream());
+		LOG.warn("Fetching message from MessageRouter on url {} failed with http status {}. Error message is\n{}.", url, status, response);
+	    }
+	} catch (Exception e) {
+	    LOG.warn("Exception was thrown during fetching message from MessageRouter on url {}.", url, e);
+	} finally {
+	    if (httpUrlConnection != null) {
+		httpUrlConnection.disconnect();
+	    }
+	}
+	return null;
+    }
+
+    private String buildAuthorizationString(String userName, String password) {
+	String basicAuthString = userName + ":" + password;
+	basicAuthString = Base64.getEncoder().encodeToString(basicAuthString.getBytes());
+	return "Basic " + basicAuthString;
+    }
+
+    protected HttpURLConnection buildHttpURLConnection(URL url) throws IOException {
+	HttpURLConnection httpUrlConnection = (HttpURLConnection) url.openConnection();
+	if (authorizationString != null) {
+	    httpUrlConnection.setRequestProperty("Authorization", authorizationString);
+	}
+	httpUrlConnection.setRequestProperty("Accept", "application/json");
+	httpUrlConnection.setUseCaches(false);
+	httpUrlConnection.setConnectTimeout(connectTimeout);
+	httpUrlConnection.setReadTimeout(readTimeout);
+
+	// ignore hostname errors when dealing with HTTPS connections
+	if (httpUrlConnection instanceof HttpsURLConnection) {
+	    HttpsURLConnection conn = (HttpsURLConnection) httpUrlConnection;
+	    conn.setHostnameVerifier(new HostnameVerifier() {
+		@Override
+		public boolean verify(String arg0, SSLSession arg1) {
+		    return true;
+		}
+	    });
+	}
+	return httpUrlConnection;
+    }
+
+    protected String readFromStream(InputStream stream) throws IOException {
+	BufferedReader br = new BufferedReader(new InputStreamReader(stream));
+	StringBuilder sb = new StringBuilder();
+	String line;
+	while ((line = br.readLine()) != null) {
+	    sb.append(line);
+	    sb.append("\n");
+	}
+	br.close();
+	return sb.toString();
+    }
+
+    @Override
+    public void registerHandler(String topic, RequestHandler requestHandler) {
+	this.topic = topic;
+	try {
+	    this.url = new URL(buildlUrlString(topic));
+	} catch (MalformedURLException e) {
+	    LOG.error("Topic " + topic + " resulted in MalformedURLException", e);
+	}
+	this.requestHandler = requestHandler;
+    }
+
+    @Override
+    public void close() throws Exception {
+	//BaseConsumer doesn't spawn any threads
+    }
+
+}
diff --git a/message-router/consumer/provider/src/main/java/org/onap/ccsdk/sli/adaptors/messagerouter/consumer/provider/impl/ConsumerFactory.java b/message-router/consumer/provider/src/main/java/org/onap/ccsdk/sli/adaptors/messagerouter/consumer/provider/impl/ConsumerFactory.java
new file mode 100755
index 00000000..051380e1
--- /dev/null
+++ b/message-router/consumer/provider/src/main/java/org/onap/ccsdk/sli/adaptors/messagerouter/consumer/provider/impl/ConsumerFactory.java
@@ -0,0 +1,179 @@
+package org.onap.ccsdk.sli.adaptors.messagerouter.consumer.provider.impl;

+

+import java.io.UnsupportedEncodingException;

+import java.net.URLEncoder;

+import java.nio.charset.StandardCharsets;

+import java.util.Properties;

+

+import org.slf4j.Logger;

+import org.slf4j.LoggerFactory;

+

+public class ConsumerFactory {

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

+

+    // Default values to minimize required configuration

+    private static final int DEFAULT_FETCH_PAUSE = 5000;

+    private static final int DEFAULT_CONNECT_TIMEOUT = 30000;

+    private static final int DEFAULT_READ_TIMEOUT = 180000;

+    private static final int DEFAULT_LIMIT = 5; // Limits the number of messages pulled in a single GET request

+    private static final int DEFAULT_TIMEOUT_QUERY_PARAM_VALUE = 15000;

+    private static final String DEFAULT_AUTH_METHOD = "basic";

+

+    // Required properties

+    protected final String username;

+    protected final String password;

+    protected final String host;

+    private final String group;

+    private final String id;

+

+    // Optional properties

+    protected Integer connectTimeout;

+    protected Integer readTimeout;

+    private Integer fetchPause;

+    private Integer limit;

+    private Integer timeoutQueryParamValue;

+    private String filter;

+    protected String auth;

+

+    public String getAuth() {

+	return auth;

+    }

+

+    public void setAuth(String auth) {

+	this.auth = auth;

+    }

+

+    public Integer getConnectTimeout() {

+	return connectTimeout;

+    }

+

+    public void setConnectTimeout(Integer connectTimeout) {

+	this.connectTimeout = connectTimeout;

+    }

+

+    public Integer getReadTimeout() {

+	return readTimeout;

+    }

+

+    public void setReadTimeout(Integer readTimeout) {

+	this.readTimeout = readTimeout;

+    }

+

+    public Integer getFetchPause() {

+	return fetchPause;

+    }

+

+    public void setFetchPause(Integer fetchPause) {

+	this.fetchPause = fetchPause;

+    }

+

+    public Integer getLimit() {

+	return limit;

+    }

+

+    public void setLimit(Integer limit) {

+	this.limit = limit;

+    }

+

+    public Integer getTimeoutQueryParamValue() {

+	return timeoutQueryParamValue;

+    }

+

+    public void setTimeoutQueryParamValue(Integer timeoutQueryParamValue) {

+	this.timeoutQueryParamValue = timeoutQueryParamValue;

+    }

+

+    public String getFilter() {

+	return filter;

+    }

+

+    public void setFilter(String filter) {

+	processFilter(filter);

+    }

+

+    public ConsumerFactory(String username, String password, String host, String group, String id, Integer connectTimeout, Integer readTimeout) {

+	this.username = username;

+	this.password = password;

+	this.host = host;

+	this.group = group;

+	this.id = id;

+	setDefaults();

+    }

+

+    public ConsumerFactory(Properties properties) {

+	// Required properties

+	username = properties.getProperty("username");

+	password = properties.getProperty("password");

+	host = properties.getProperty("host");

+	auth = properties.getProperty("auth");

+	group = properties.getProperty("group");

+	id = properties.getProperty("id");

+

+	// Optional properties

+	connectTimeout = readOptionalInteger(properties, "connectTimeoutSeconds");

+	readTimeout = readOptionalInteger(properties, "readTimeoutMinutes");

+	fetchPause = readOptionalInteger(properties, "fetchPause");

+	limit = readOptionalInteger(properties, "limit");

+	timeoutQueryParamValue = readOptionalInteger(properties, "timeout");

+	processFilter(properties.getProperty("filter"));

+

+	setDefaults();

+    }

+

+    private Integer readOptionalInteger(Properties properties, String propertyName) {

+	String stringValue = properties.getProperty(propertyName);

+	if (stringValue != null && stringValue.length() > 0) {

+	    try {

+		return Integer.valueOf(stringValue);

+	    } catch (NumberFormatException e) {

+		LOG.error("property " + propertyName + " had the value " + stringValue + " that could not be converted to an Integer", e);

+	    }

+	}

+	return null;

+    }

+

+    public PollingConsumerImpl createPollingClient() {

+	return new PollingConsumerImpl(username, password, host, auth, connectTimeout, readTimeout, fetchPause, group, id, filter, limit, timeoutQueryParamValue);

+    }

+

+    public PullingConsumerImpl createPullingClient() {

+	return new PullingConsumerImpl(username, password, host, auth, connectTimeout, readTimeout, group, id, filter, limit, timeoutQueryParamValue);

+    }

+

+    private void processFilter(String filterString) {

+	if (filterString != null) {

+	    if (filterString.length() > 0) {

+		try {

+		    filter = URLEncoder.encode(filterString, StandardCharsets.UTF_8.name());

+		} catch (UnsupportedEncodingException e) {

+		    LOG.warn("Couldn't encode filter string. Filter will be ignored.", e);

+		    filter = null;

+		}

+	    } else {

+		filter = null;

+	    }

+	}

+    }

+

+    private void setDefaults() {

+	if (connectTimeout == null) {

+	    connectTimeout = DEFAULT_CONNECT_TIMEOUT;

+	}

+	if (readTimeout == null) {

+	    readTimeout = DEFAULT_READ_TIMEOUT;

+	}

+	if (fetchPause == null) {

+	    fetchPause = DEFAULT_FETCH_PAUSE;

+	}

+	if (limit == null) {

+	    limit = DEFAULT_LIMIT;

+	}

+	if (timeoutQueryParamValue == null) {

+	    timeoutQueryParamValue = DEFAULT_TIMEOUT_QUERY_PARAM_VALUE;

+	}

+	if (auth == null) {

+	    auth = DEFAULT_AUTH_METHOD;

+	}

+    }

+

+}

diff --git a/message-router/consumer/provider/src/main/java/org/onap/ccsdk/sli/adaptors/messagerouter/consumer/provider/impl/PollingConsumerImpl.java b/message-router/consumer/provider/src/main/java/org/onap/ccsdk/sli/adaptors/messagerouter/consumer/provider/impl/PollingConsumerImpl.java
new file mode 100644
index 00000000..263e94ca
--- /dev/null
+++ b/message-router/consumer/provider/src/main/java/org/onap/ccsdk/sli/adaptors/messagerouter/consumer/provider/impl/PollingConsumerImpl.java
@@ -0,0 +1,100 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * openECOMP : SDN-C
+ * ================================================================================
+ * Copyright (C) 2017 - 2018 AT&T Intellectual Property. All rights
+ *                      reserved.
+ * ================================================================================
+ * 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.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.ccsdk.sli.adaptors.messagerouter.consumer.provider.impl;
+
+import org.onap.ccsdk.sli.adaptors.messagerouter.consumer.api.PollingConsumer;
+import org.onap.ccsdk.sli.adaptors.messagerouter.consumer.api.RequestHandler;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/*
+ * java.net based client to build message router consumers
+ */
+public class PollingConsumerImpl implements PollingConsumer {
+
+    //RunnableConsumer is a private inner class so run cannot be called from other code
+    private class RunnableConsumer extends AbstractBaseConsumer implements Runnable, PollingConsumer {
+	private final Logger LOG = LoggerFactory.getLogger(PollingConsumerImpl.class);
+	private volatile Thread t;
+	private final Integer fetchPause;
+
+	public RunnableConsumer(String username, String password, String host, String authentication, Integer connectTimeout, Integer readTimeout, Integer fetchPause, String group, String id, String filter, Integer limit, Integer timeoutQueryParamValue) {
+	    super(username, password, host, authentication, connectTimeout, readTimeout, group, id, filter, limit, timeoutQueryParamValue);
+	    this.fetchPause = fetchPause;
+	}
+
+	public void start() {
+	    t = new Thread(this);
+	    t.start();
+	    LOG.info("ConsumerImpl started. Fetch period is {} ms.", fetchPause);
+	}
+
+	public void stop() {
+	    t = null;
+	    LOG.info("ConsumerImpl stopped.");
+	}
+
+	@Override
+	public void run() {
+	    if (this.url != null) {
+		Thread thisThread = Thread.currentThread();
+		while (t == thisThread) {
+		    poll();
+		    try {
+			LOG.trace("Next fetch from MessageRouter url {} after {} milliseconds.", url, fetchPause);
+			Thread.sleep(fetchPause);
+		    } catch (InterruptedException e) {
+			LOG.warn("Thread sleep was interrupted.", e);
+		    }
+		}
+	    } else {
+		LOG.error("URL is null, can't listen for messages");
+	    }
+	}
+
+	@Override
+	public void close() throws Exception {
+	    stop();
+	}
+    }
+
+    private RunnableConsumer c;
+
+    public PollingConsumerImpl(String username, String password, String host, String authentication, Integer connectTimeout, Integer readTimeout, Integer fetchPause, String group, String id, String filter, Integer limit, Integer timeoutQueryParamValue) {
+	c = new RunnableConsumer(username, password, host, authentication, connectTimeout, readTimeout, fetchPause, group, id, filter, limit, timeoutQueryParamValue);
+    }
+
+    @Override
+    public void start() {
+	c.start();
+    }
+
+    @Override
+    public void registerHandler(String topic, RequestHandler requestHandler) {
+	c.registerHandler(topic, requestHandler);
+    }
+
+    @Override
+    public void close() throws Exception {
+	c.close();
+    }
+}
diff --git a/message-router/consumer/provider/src/main/java/org/onap/ccsdk/sli/adaptors/messagerouter/consumer/provider/impl/PullingConsumerImpl.java b/message-router/consumer/provider/src/main/java/org/onap/ccsdk/sli/adaptors/messagerouter/consumer/provider/impl/PullingConsumerImpl.java
new file mode 100755
index 00000000..b3f0aef4
--- /dev/null
+++ b/message-router/consumer/provider/src/main/java/org/onap/ccsdk/sli/adaptors/messagerouter/consumer/provider/impl/PullingConsumerImpl.java
@@ -0,0 +1,17 @@
+package org.onap.ccsdk.sli.adaptors.messagerouter.consumer.provider.impl;
+
+import org.onap.ccsdk.sli.adaptors.messagerouter.consumer.api.PullingConsumer;
+import org.onap.ccsdk.sli.adaptors.messagerouter.consumer.api.RequestHandler;
+
+public class PullingConsumerImpl extends AbstractBaseConsumer implements PullingConsumer {
+
+    public PullingConsumerImpl(String username, String password, String host, String authentication, Integer connectTimeout, Integer readTimeout, String group, String id, String filter, Integer limit, Integer timeoutQueryParamValue) {
+	super(username, password, host, authentication, connectTimeout, readTimeout, group, id, filter, limit, timeoutQueryParamValue);
+    }
+
+    @Override
+    public void pull() {
+	this.poll();
+    }
+
+}