add message router publisher

initial api and implementation of message router publisher

Change-Id: Ic69d013bae8ab8c842e6ecd2eef41e10649d1009
Issue-ID: CCSDK-1163
Signed-off-by: Smokowski, Kevin (ks6305) <kevin.smokowski@att.com>

2 files changed, 163 insertions, 0 deletions

diff --git a/message-router/publisher/provider/src/main/java/org/onap/ccsdk/messagerouter/publisher/provider/impl/PublisherApiImpl.java b/message-router/publisher/provider/src/main/java/org/onap/ccsdk/messagerouter/publisher/provider/impl/PublisherApiImpl.java
new file mode 100755
index 000000000..3e8ab3333
--- /dev/null
+++ b/message-router/publisher/provider/src/main/java/org/onap/ccsdk/messagerouter/publisher/provider/impl/PublisherApiImpl.java
@@ -0,0 +1,149 @@
+package org.onap.ccsdk.messagerouter.publisher.provider.impl;

+

+import java.io.BufferedReader;

+import java.io.DataOutputStream;

+import java.io.IOException;

+import java.io.InputStream;

+import java.io.InputStreamReader;

+import java.net.HttpURLConnection;

+import java.net.SocketException;

+import java.net.URL;

+import java.util.Base64;

+

+import org.onap.ccsdk.messagerouter.publisher.api.PublisherApi;

+import org.slf4j.Logger;

+import org.slf4j.LoggerFactory;

+

+public class PublisherApiImpl implements PublisherApi {

+	private static final Logger logger = LoggerFactory.getLogger(PublisherApiImpl.class);

+	protected final Integer DEFAULT_CONNECT_TIMEOUT = 30000; // will be treated as 30 seconds

+	protected final Integer DEFAULT_READ_TIMEOUT = 180000; // will be treated as 3 minutes

+	private String authorizationString;

+	protected Integer connectTimeout;

+	protected Integer readTimeout;

+	protected String baseUrl;

+	protected String username;

+	protected String[] hosts;

+	private String password;

+

+	public void setUsername(String username) {

+		this.username = username;

+		buildAuthorizationString();

+	}

+

+	public void setPassword(String password) {

+		this.password = password;

+		buildAuthorizationString();

+	}

+

+	public void setHost(String hostString) {

+		// a comma separated list of hosts can be passed in or a single host may be used

+		if (!hostString.contains(",")) {

+			this.hosts = new String[] { hostString };

+		} else {

+			this.hosts = hostString.split(",");

+		}

+	}

+

+	public PublisherApiImpl() {

+		connectTimeout = DEFAULT_CONNECT_TIMEOUT;

+		readTimeout = DEFAULT_READ_TIMEOUT;

+	}

+

+	public void init() {

+		buildAuthorizationString();

+	}

+

+	private String buildUrlString(Integer hostIndex, String topic) {

+		return hosts[hostIndex] + "/events/" + topic;

+	}

+

+	protected void configureHttpURLConnection(HttpURLConnection httpUrlConnection) {

+		httpUrlConnection.setRequestProperty("Content-Type", "application/json");

+	}

+

+	public Boolean publish(String topic, String body) {

+		for (int hostIndex = 0; hostIndex < hosts.length; hostIndex++) {

+			HttpURLConnection httpUrlConnection = null;

+			URL url = null;

+			try {

+				url = new URL(buildUrlString(hostIndex, topic));

+				logger.info("Publishing body to topic {} using the url {}", topic, url);

+				logger.info("Message to publish is\n{}", body);

+				httpUrlConnection = buildHttpURLConnection(url);

+				httpUrlConnection.setDoInput(true);

+				httpUrlConnection.setDoOutput(true);

+				httpUrlConnection.setUseCaches(false);

+				httpUrlConnection.setRequestMethod("POST");

+

+				// Write message

+				httpUrlConnection.setRequestProperty("Content-Length", Integer.toString(body.length()));

+				DataOutputStream outStr = new DataOutputStream(httpUrlConnection.getOutputStream());

+				outStr.write(body.getBytes());

+				outStr.close();

+

+				int status = httpUrlConnection.getResponseCode();

+				logger.info("Publishing body for topic {} using  url {} returned status {}.", topic, url, status);

+				if (status < 300) {

+					String responseFromDMaaP = readFromStream(httpUrlConnection.getInputStream());

+					logger.info("Message router response is\n{}", responseFromDMaaP);

+					return true;

+				} else {

+					if (httpUrlConnection.getErrorStream() != null) {

+						String responseFromDMaaP = readFromStream(httpUrlConnection.getErrorStream());

+						logger.warn("Publishing body for topic {} using  url {} failed." + " Error message is\n{}",

+								topic, url, responseFromDMaaP);

+					}

+					return false;

+				}

+

+			} catch (SocketException socketException) {

+				logger.error("SocketException was thrown during publishing message to DMaaP on url {}.", url,

+						socketException);

+				if (hostIndex < hosts.length) {

+					logger.info("Message sent to {} failed with a SocketException, but will be tried on {}",

+							hosts[hostIndex], hosts[hostIndex + 1]);

+				}

+			} catch (Exception e) {

+				logger.warn("Exception was thrown during publishing message to DMaaP on url {}.", url, e);

+				return false;

+			} finally {

+				if (httpUrlConnection != null) {

+					httpUrlConnection.disconnect();

+				}

+			}

+		}

+		return false;

+	}

+

+	private void buildAuthorizationString() {

+		String basicAuthString = username + ":" + password;

+		basicAuthString = Base64.getEncoder().encodeToString(basicAuthString.getBytes());

+		this.authorizationString = "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);

+		configureHttpURLConnection(httpUrlConnection);

+		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);

+		}

+		br.close();

+		return sb.toString();

+	}

+

+}
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diff --git a/message-router/publisher/provider/src/main/resources/OSGI-INF/blueprint/blueprint.xml b/message-router/publisher/provider/src/main/resources/OSGI-INF/blueprint/blueprint.xml
new file mode 100755
index 000000000..da25fd23d
--- /dev/null
+++ b/message-router/publisher/provider/src/main/resources/OSGI-INF/blueprint/blueprint.xml
@@ -0,0 +1,14 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<blueprint xmlns="http://www.osgi.org/xmlns/blueprint/v1.0.0"
+	xmlns:cm="http://aries.apache.org/blueprint/xmlns/blueprint-cm/v1.2.0">
+
+	<bean id="publisher"
+		class="org.onap.ccsdk.messagerouter.publisher.provider.impl.PublisherApiImpl">
+		<cm:managed-properties
+			persistent-id="org.onap.ccsdk.messagerouter.publisher.provider"
+			update-strategy="container-managed" />
+	</bean>
+
+	<service ref="publisher" interface="org.onap.ccsdk.messagerouter.publisher.api.PublisherApi" />
+
+</blueprint>
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