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sample-based SSE streams for configuration/utilization #1060

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bf2e576
Added configuration data objects and a way to stream them out on a timer
Jan 20, 2016
6d4bfe3
First pass at config JSON SSE stream
Jan 22, 2016
7c33691
Added utilization SSE stream
Jan 22, 2016
6b857d0
Added parent class to encapsulate shared SSE logic
Jan 22, 2016
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211 changes: 211 additions & 0 deletions ...ream/src/main/java/com/netflix/hystrix/contrib/sample/stream/HystrixConfigSseServlet.java
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/**
* Copyright 2016 Netflix, Inc.
*
* 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.netflix.hystrix.contrib.sample.stream;

import com.fasterxml.jackson.core.JsonFactory;
import com.fasterxml.jackson.core.JsonGenerator;
import com.netflix.config.DynamicIntProperty;
import com.netflix.config.DynamicPropertyFactory;
import com.netflix.hystrix.HystrixCollapserKey;
import com.netflix.hystrix.HystrixCommandKey;
import com.netflix.hystrix.HystrixThreadPoolKey;
import com.netflix.hystrix.config.HystrixCollapserConfiguration;
import com.netflix.hystrix.config.HystrixCommandConfiguration;
import com.netflix.hystrix.config.HystrixConfiguration;
import com.netflix.hystrix.config.HystrixConfigurationStream;
import com.netflix.hystrix.config.HystrixThreadPoolConfiguration;
import rx.Observable;
import rx.functions.Func1;

import java.io.IOException;
import java.io.StringWriter;
import java.util.Map;
import java.util.concurrent.atomic.AtomicInteger;

/**
* Streams Hystrix config in text/event-stream format.
* <p>
* Install by:
* <p>
* 1) Including hystrix-metrics-event-stream-*.jar in your classpath.
* <p>
* 2) Adding the following to web.xml:
* <pre>{@code
* <servlet>
* <description></description>
* <display-name>HystrixConfigSseServlet</display-name>
* <servlet-name>HystrixConfigSseServlet</servlet-name>
* <servlet-class>com.netflix.hystrix.contrib.sample.stream.HystrixConfigSseServlet</servlet-class>
* </servlet>
* <servlet-mapping>
* <servlet-name>HystrixConfigSseServlet</servlet-name>
* <url-pattern>/hystrix/config.stream</url-pattern>
* </servlet-mapping>
* } </pre>
*/
public class HystrixConfigSseServlet extends HystrixSampleSseServlet<HystrixConfiguration> {

private static final long serialVersionUID = -3599771169762858235L;

private static final int DEFAULT_ONNEXT_DELAY_IN_MS = 10000;

private JsonFactory jsonFactory = new JsonFactory();

/* used to track number of connections and throttle */
private static AtomicInteger concurrentConnections = new AtomicInteger(0);
private static DynamicIntProperty maxConcurrentConnections = DynamicPropertyFactory.getInstance().getIntProperty("hystrix.config.stream.maxConcurrentConnections", 5);

public HystrixConfigSseServlet() {
super(new Func1<Integer, Observable<HystrixConfiguration>>() {
@Override
public Observable<HystrixConfiguration> call(Integer delay) {
return new HystrixConfigurationStream(delay).observe();
}
});
}

/* package-private */ HystrixConfigSseServlet(Func1<Integer, Observable<HystrixConfiguration>> createStream) {
super(createStream);
}

@Override
int getDefaultDelayInMilliseconds() {
return DEFAULT_ONNEXT_DELAY_IN_MS;
}

@Override
int getMaxNumberConcurrentConnectionsAllowed() {
return maxConcurrentConnections.get();
}

@Override
int getNumberCurrentConnections() {
return concurrentConnections.get();
}

@Override
protected int incrementAndGetCurrentConcurrentConnections() {
return concurrentConnections.incrementAndGet();
}

@Override
protected void decrementCurrentConcurrentConnections() {
concurrentConnections.decrementAndGet();
}

private void writeCommandConfigJson(JsonGenerator json, HystrixCommandKey key, HystrixCommandConfiguration commandConfig) throws IOException {
json.writeObjectFieldStart(key.name());
json.writeStringField("threadPoolKey", commandConfig.getThreadPoolKey().name());
json.writeStringField("groupKey", commandConfig.getGroupKey().name());
json.writeObjectFieldStart("execution");
HystrixCommandConfiguration.HystrixCommandExecutionConfig executionConfig = commandConfig.getExecutionConfig();
json.writeStringField("isolationStrategy", executionConfig.getIsolationStrategy().name());
json.writeStringField("threadPoolKeyOverride", executionConfig.getThreadPoolKeyOverride());
json.writeBooleanField("requestCacheEnabled", executionConfig.isRequestCacheEnabled());
json.writeBooleanField("requestLogEnabled", executionConfig.isRequestLogEnabled());
json.writeBooleanField("timeoutEnabled", executionConfig.isTimeoutEnabled());
json.writeBooleanField("fallbackEnabled", executionConfig.isFallbackEnabled());
json.writeNumberField("timeoutInMilliseconds", executionConfig.getTimeoutInMilliseconds());
json.writeNumberField("semaphoreSize", executionConfig.getSemaphoreMaxConcurrentRequests());
json.writeNumberField("fallbackSemaphoreSize", executionConfig.getFallbackMaxConcurrentRequest());
json.writeBooleanField("threadInterruptOnTimeout", executionConfig.isThreadInterruptOnTimeout());
json.writeEndObject();
json.writeObjectFieldStart("metrics");
HystrixCommandConfiguration.HystrixCommandMetricsConfig metricsConfig = commandConfig.getMetricsConfig();
json.writeNumberField("healthBucketSizeInMs", metricsConfig.getHealthIntervalInMilliseconds());
json.writeNumberField("percentileBucketSizeInMilliseconds", metricsConfig.getRollingPercentileBucketSizeInMilliseconds());
json.writeNumberField("percentileBucketCount", metricsConfig.getRollingCounterNumberOfBuckets());
json.writeBooleanField("percentileEnabled", metricsConfig.isRollingPercentileEnabled());
json.writeNumberField("counterBucketSizeInMilliseconds", metricsConfig.getRollingCounterBucketSizeInMilliseconds());
json.writeNumberField("counterBucketCount", metricsConfig.getRollingCounterNumberOfBuckets());
json.writeEndObject();
json.writeObjectFieldStart("circuitBreaker");
HystrixCommandConfiguration.HystrixCommandCircuitBreakerConfig circuitBreakerConfig = commandConfig.getCircuitBreakerConfig();
json.writeBooleanField("enabled", circuitBreakerConfig.isEnabled());
json.writeBooleanField("isForcedOpen", circuitBreakerConfig.isForceOpen());
json.writeBooleanField("isForcedClosed", circuitBreakerConfig.isForceOpen());
json.writeNumberField("requestVolumeThreshold", circuitBreakerConfig.getRequestVolumeThreshold());
json.writeNumberField("errorPercentageThreshold", circuitBreakerConfig.getErrorThresholdPercentage());
json.writeNumberField("sleepInMilliseconds", circuitBreakerConfig.getSleepWindowInMilliseconds());
json.writeEndObject();
json.writeEndObject();
}

private void writeThreadPoolConfigJson(JsonGenerator json, HystrixThreadPoolKey threadPoolKey, HystrixThreadPoolConfiguration threadPoolConfig) throws IOException {
json.writeObjectFieldStart(threadPoolKey.name());
json.writeNumberField("coreSize", threadPoolConfig.getCoreSize());
json.writeNumberField("maxQueueSize", threadPoolConfig.getMaxQueueSize());
json.writeNumberField("queueRejectionThreshold", threadPoolConfig.getQueueRejectionThreshold());
json.writeNumberField("keepAliveTimeInMinutes", threadPoolConfig.getKeepAliveTimeInMinutes());
json.writeNumberField("counterBucketSizeInMilliseconds", threadPoolConfig.getRollingCounterBucketSizeInMilliseconds());
json.writeNumberField("counterBucketCount", threadPoolConfig.getRollingCounterNumberOfBuckets());
json.writeEndObject();
}

private void writeCollapserConfigJson(JsonGenerator json, HystrixCollapserKey collapserKey, HystrixCollapserConfiguration collapserConfig) throws IOException {
json.writeObjectFieldStart(collapserKey.name());
json.writeNumberField("maxRequestsInBatch", collapserConfig.getMaxRequestsInBatch());
json.writeNumberField("timerDelayInMilliseconds", collapserConfig.getTimerDelayInMilliseconds());
json.writeBooleanField("requestCacheEnabled", collapserConfig.isRequestCacheEnabled());
json.writeObjectFieldStart("metrics");
HystrixCollapserConfiguration.CollapserMetricsConfig metricsConfig = collapserConfig.getCollapserMetricsConfig();
json.writeNumberField("percentileBucketSizeInMilliseconds", metricsConfig.getRollingPercentileBucketSizeInMilliseconds());
json.writeNumberField("percentileBucketCount", metricsConfig.getRollingCounterNumberOfBuckets());
json.writeBooleanField("percentileEnabled", metricsConfig.isRollingPercentileEnabled());
json.writeNumberField("counterBucketSizeInMilliseconds", metricsConfig.getRollingCounterBucketSizeInMilliseconds());
json.writeNumberField("counterBucketCount", metricsConfig.getRollingCounterNumberOfBuckets());
json.writeEndObject();
json.writeEndObject();
}

@Override
protected String convertToString(HystrixConfiguration config) throws IOException {
StringWriter jsonString = new StringWriter();
JsonGenerator json = jsonFactory.createGenerator(jsonString);

json.writeStartObject();
json.writeStringField("type", "HystrixConfig");
json.writeObjectFieldStart("commands");
for (Map.Entry<HystrixCommandKey, HystrixCommandConfiguration> entry: config.getCommandConfig().entrySet()) {
final HystrixCommandKey key = entry.getKey();
final HystrixCommandConfiguration commandConfig = entry.getValue();
writeCommandConfigJson(json, key, commandConfig);

}
json.writeEndObject();

json.writeObjectFieldStart("threadpools");
for (Map.Entry<HystrixThreadPoolKey, HystrixThreadPoolConfiguration> entry: config.getThreadPoolConfig().entrySet()) {
final HystrixThreadPoolKey threadPoolKey = entry.getKey();
final HystrixThreadPoolConfiguration threadPoolConfig = entry.getValue();
writeThreadPoolConfigJson(json, threadPoolKey, threadPoolConfig);
}
json.writeEndObject();

json.writeObjectFieldStart("collapsers");
for (Map.Entry<HystrixCollapserKey, HystrixCollapserConfiguration> entry: config.getCollapserConfig().entrySet()) {
final HystrixCollapserKey collapserKey = entry.getKey();
final HystrixCollapserConfiguration collapserConfig = entry.getValue();
writeCollapserConfigJson(json, collapserKey, collapserConfig);
}
json.writeEndObject();
json.writeEndObject();
json.close();

return jsonString.getBuffer().toString();
}
}

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