/*
* Copyright (c) 2015, WSO2 Inc. (http://www.wso2.org) All Rights Reserved.
*
* WSO2 Inc. 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.wso2.carbon.event.output.adapter.http;
import org.apache.axiom.om.util.Base64;
import org.apache.commons.httpclient.*;
import org.apache.commons.httpclient.HttpClient;
import org.apache.commons.httpclient.methods.*;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.http.HttpHost;
import org.apache.http.conn.params.ConnRoutePNames;
import org.wso2.carbon.context.PrivilegedCarbonContext;
import org.wso2.carbon.event.output.adapter.core.EventAdapterUtil;
import org.wso2.carbon.event.output.adapter.core.OutputEventAdapter;
import org.wso2.carbon.event.output.adapter.core.OutputEventAdapterConfiguration;
import org.wso2.carbon.event.output.adapter.core.exception.OutputEventAdapterException;
import org.wso2.carbon.event.output.adapter.core.exception.TestConnectionNotSupportedException;
import org.wso2.carbon.event.output.adapter.http.internal.util.HTTPEventAdapterConstants;
import java.net.URL;
import java.net.UnknownHostException;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.*;
public class HTTPEventAdapter implements OutputEventAdapter {
private static final Log log = LogFactory.getLog(OutputEventAdapter.class);
private OutputEventAdapterConfiguration eventAdapterConfiguration;
private Map<String, String> globalProperties;
private static ExecutorService executorService;
private String clientMethod;
private int tenantId;
private String contentType;
private static HttpConnectionManager connectionManager;
private HttpClient httpClient = null;
private HostConfiguration hostConfiguration = null;
public HTTPEventAdapter(OutputEventAdapterConfiguration eventAdapterConfiguration,
Map<String, String> globalProperties) {
this.eventAdapterConfiguration = eventAdapterConfiguration;
this.globalProperties = globalProperties;
this.clientMethod = eventAdapterConfiguration.getStaticProperties()
.get(HTTPEventAdapterConstants.ADAPTER_HTTP_CLIENT_METHOD);
}
@Override
public void init() throws OutputEventAdapterException {
tenantId = PrivilegedCarbonContext.getThreadLocalCarbonContext().getTenantId();
//ExecutorService will be assigned if it is null
if (executorService == null) {
int minThread;
int maxThread;
long defaultKeepAliveTime;
int jobQueSize;
//If global properties are available those will be assigned else constant values will be assigned
if (globalProperties.get(HTTPEventAdapterConstants.ADAPTER_MIN_THREAD_POOL_SIZE_NAME) != null) {
minThread = Integer
.parseInt(globalProperties.get(HTTPEventAdapterConstants.ADAPTER_MIN_THREAD_POOL_SIZE_NAME));
} else {
minThread = HTTPEventAdapterConstants.ADAPTER_MIN_THREAD_POOL_SIZE;
}
if (globalProperties.get(HTTPEventAdapterConstants.ADAPTER_MAX_THREAD_POOL_SIZE_NAME) != null) {
maxThread = Integer
.parseInt(globalProperties.get(HTTPEventAdapterConstants.ADAPTER_MAX_THREAD_POOL_SIZE_NAME));
} else {
maxThread = HTTPEventAdapterConstants.ADAPTER_MAX_THREAD_POOL_SIZE;
}
if (globalProperties.get(HTTPEventAdapterConstants.ADAPTER_KEEP_ALIVE_TIME_NAME) != null) {
defaultKeepAliveTime = Integer
.parseInt(globalProperties.get(HTTPEventAdapterConstants.ADAPTER_KEEP_ALIVE_TIME_NAME));
} else {
defaultKeepAliveTime = HTTPEventAdapterConstants.DEFAULT_KEEP_ALIVE_TIME_IN_MILLIS;
}
if (globalProperties.get(HTTPEventAdapterConstants.ADAPTER_EXECUTOR_JOB_QUEUE_SIZE_NAME) != null) {
jobQueSize = Integer
.parseInt(globalProperties.get(HTTPEventAdapterConstants.ADAPTER_EXECUTOR_JOB_QUEUE_SIZE_NAME));
} else {
jobQueSize = HTTPEventAdapterConstants.ADAPTER_EXECUTOR_JOB_QUEUE_SIZE;
}
executorService = new ThreadPoolExecutor(minThread, maxThread, defaultKeepAliveTime, TimeUnit.MILLISECONDS,
new LinkedBlockingQueue<Runnable>(jobQueSize));
//configurations for the httpConnectionManager which will be shared by every http adapter
int defaultMaxConnectionsPerHost;
int maxTotalConnections;
if (globalProperties.get(HTTPEventAdapterConstants.DEFAULT_MAX_CONNECTIONS_PER_HOST) != null) {
defaultMaxConnectionsPerHost = Integer
.parseInt(globalProperties.get(HTTPEventAdapterConstants.DEFAULT_MAX_CONNECTIONS_PER_HOST));
} else {
defaultMaxConnectionsPerHost = HTTPEventAdapterConstants.DEFAULT_DEFAULT_MAX_CONNECTIONS_PER_HOST;
}
if (globalProperties.get(HTTPEventAdapterConstants.MAX_TOTAL_CONNECTIONS) != null) {
maxTotalConnections = Integer
.parseInt(globalProperties.get(HTTPEventAdapterConstants.MAX_TOTAL_CONNECTIONS));
} else {
maxTotalConnections = HTTPEventAdapterConstants.DEFAULT_MAX_TOTAL_CONNECTIONS;
}
connectionManager = new MultiThreadedHttpConnectionManager();
connectionManager.getParams().setDefaultMaxConnectionsPerHost(defaultMaxConnectionsPerHost);
connectionManager.getParams().setMaxTotalConnections(maxTotalConnections);
}
}
@Override
public void testConnect() throws TestConnectionNotSupportedException {
throw new TestConnectionNotSupportedException("Test connection is not available");
}
@Override
public void connect() {
this.checkHTTPClientInit(eventAdapterConfiguration.getStaticProperties());
}
@Override
public void publish(Object message, Map<String, String> dynamicProperties) {
//Load dynamic properties
String url = dynamicProperties.get(HTTPEventAdapterConstants.ADAPTER_MESSAGE_URL);
String username = dynamicProperties.get(HTTPEventAdapterConstants.ADAPTER_USERNAME);
String password = dynamicProperties.get(HTTPEventAdapterConstants.ADAPTER_PASSWORD);
Map<String, String> headers = this
.extractHeaders(dynamicProperties.get(HTTPEventAdapterConstants.ADAPTER_HEADERS));
String payload = message.toString();
try {
executorService.submit(new HTTPSender(url, payload, username, password, headers, httpClient));
} catch (RejectedExecutionException e) {
EventAdapterUtil
.logAndDrop(eventAdapterConfiguration.getName(), message, "Job queue is full", e, log, tenantId);
}
}
@Override
public void disconnect() {
//not required
}
@Override
public void destroy() {
//not required
}
@Override
public boolean isPolled() {
return false;
}
private void checkHTTPClientInit(Map<String, String> staticProperties) {
if (this.httpClient != null) {
return;
}
synchronized (HTTPEventAdapter.class) {
if (this.httpClient != null) {
return;
}
httpClient = new HttpClient(connectionManager);
String proxyHost = staticProperties.get(HTTPEventAdapterConstants.ADAPTER_PROXY_HOST);
String proxyPort = staticProperties.get(HTTPEventAdapterConstants.ADAPTER_PROXY_PORT);
if (proxyHost != null && proxyHost.trim().length() > 0) {
try {
HttpHost host = new HttpHost(proxyHost, Integer.parseInt(proxyPort));
this.httpClient.getParams().setParameter(ConnRoutePNames.DEFAULT_PROXY, host);
} catch (NumberFormatException e) {
log.error("Invalid proxy port: " + proxyPort + ", "
+ "ignoring proxy settings for HTTP output event adaptor...");
}
}
String messageFormat = eventAdapterConfiguration.getMessageFormat();
if (messageFormat.equalsIgnoreCase("json")) {
contentType = "application/json";
} else if (messageFormat.equalsIgnoreCase("text")) {
contentType = "text/plain";
} else {
contentType = "text/xml";
}
}
}
private Map<String, String> extractHeaders(String headers) {
if (headers == null || headers.trim().length() == 0) {
return null;
}
String[] entries = headers.split(HTTPEventAdapterConstants.HEADER_SEPARATOR);
String[] keyValue;
Map<String, String> result = new HashMap<String, String>();
for (String header : entries) {
try {
keyValue = header.split(HTTPEventAdapterConstants.ENTRY_SEPARATOR, 2);
result.put(keyValue[0].trim(), keyValue[1].trim());
} catch (Exception e) {
log.warn("Header property '" + header + "' is not defined in the correct format.", e);
}
}
return result;
}
/**
* This class represents a job to send an HTTP request to a target URL.
*/
class HTTPSender implements Runnable {
private String url;
private String payload;
private String username;
private String password;
private Map<String, String> headers;
private HttpClient httpClient;
public HTTPSender(String url, String payload, String username, String password, Map<String, String> headers,
HttpClient httpClient) {
this.url = url;
this.payload = payload;
this.username = username;
this.password = password;
this.headers = headers;
this.httpClient = httpClient;
}
public String getUrl() {
return url;
}
public String getPayload() {
return payload;
}
public String getUsername() {
return username;
}
public String getPassword() {
return password;
}
public Map<String, String> getHeaders() {
return headers;
}
public HttpClient getHttpClient() {
return httpClient;
}
public void run() {
EntityEnclosingMethod method = null;
try {
if (clientMethod.equalsIgnoreCase(HTTPEventAdapterConstants.CONSTANT_HTTP_PUT)) {
method = new PutMethod(this.getUrl());
} else {
method = new PostMethod(this.getUrl());
}
if (hostConfiguration == null) {
URL hostUrl = new URL(this.getUrl());
hostConfiguration = new HostConfiguration();
hostConfiguration.setHost(hostUrl.getHost(), hostUrl.getPort(), hostUrl.getProtocol());
}
method.setRequestEntity(new StringRequestEntity(this.getPayload(), contentType, "UTF-8"));
if (this.getUsername() != null && this.getUsername().trim().length() > 0) {
method.setRequestHeader("Authorization", "Basic " + Base64
.encode((this.getUsername() + HTTPEventAdapterConstants.ENTRY_SEPARATOR + this
.getPassword()).getBytes()));
}
if (this.getHeaders() != null) {
for (Map.Entry<String, String> header : this.getHeaders().entrySet()) {
method.setRequestHeader(header.getKey(), header.getValue());
}
}
this.getHttpClient().executeMethod(hostConfiguration, method);
} catch (UnknownHostException e) {
EventAdapterUtil.logAndDrop(eventAdapterConfiguration.getName(), this.getPayload(),
"Cannot connect to " + this.getUrl(), e, log, tenantId);
} catch (Throwable e) {
EventAdapterUtil
.logAndDrop(eventAdapterConfiguration.getName(), this.getPayload(), null, e, log, tenantId);
} finally {
if (method != null) {
method.releaseConnection();
}
}
}
}
}