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OutlierDetectionLoadBalancerProvider.java
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OutlierDetectionLoadBalancerProvider.java
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/*
* Copyright 2022 The gRPC Authors
*
* 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 io.grpc.util;
import io.grpc.Internal;
import io.grpc.LoadBalancer;
import io.grpc.LoadBalancer.Helper;
import io.grpc.LoadBalancerProvider;
import io.grpc.LoadBalancerRegistry;
import io.grpc.NameResolver.ConfigOrError;
import io.grpc.Status;
import io.grpc.internal.JsonUtil;
import io.grpc.internal.ServiceConfigUtil;
import io.grpc.internal.ServiceConfigUtil.LbConfig;
import io.grpc.internal.ServiceConfigUtil.PolicySelection;
import io.grpc.internal.TimeProvider;
import io.grpc.util.OutlierDetectionLoadBalancer.OutlierDetectionLoadBalancerConfig;
import io.grpc.util.OutlierDetectionLoadBalancer.OutlierDetectionLoadBalancerConfig.FailurePercentageEjection;
import io.grpc.util.OutlierDetectionLoadBalancer.OutlierDetectionLoadBalancerConfig.SuccessRateEjection;
import java.util.List;
import java.util.Map;
@Internal
public final class OutlierDetectionLoadBalancerProvider extends LoadBalancerProvider {
@Override
public LoadBalancer newLoadBalancer(Helper helper) {
return new OutlierDetectionLoadBalancer(helper, TimeProvider.SYSTEM_TIME_PROVIDER);
}
@Override
public boolean isAvailable() {
return true;
}
@Override
public int getPriority() {
return 5;
}
@Override
public String getPolicyName() {
return "outlier_detection_experimental";
}
@Override
public ConfigOrError parseLoadBalancingPolicyConfig(Map<String, ?> rawConfig) {
// Common configuration.
Long intervalNanos = JsonUtil.getStringAsDuration(rawConfig, "interval");
Long baseEjectionTimeNanos = JsonUtil.getStringAsDuration(rawConfig, "baseEjectionTime");
Long maxEjectionTimeNanos = JsonUtil.getStringAsDuration(rawConfig, "maxEjectionTime");
Integer maxEjectionPercentage = JsonUtil.getNumberAsInteger(rawConfig,
"maxEjectionPercentage");
OutlierDetectionLoadBalancerConfig.Builder configBuilder
= new OutlierDetectionLoadBalancerConfig.Builder();
if (intervalNanos != null) {
configBuilder.setIntervalNanos(intervalNanos);
}
if (baseEjectionTimeNanos != null) {
configBuilder.setBaseEjectionTimeNanos(baseEjectionTimeNanos);
}
if (maxEjectionTimeNanos != null) {
configBuilder.setMaxEjectionTimeNanos(maxEjectionTimeNanos);
}
if (maxEjectionPercentage != null) {
configBuilder.setMaxEjectionPercent(maxEjectionPercentage);
}
// Success rate ejection specific configuration.
Map<String, ?> rawSuccessRateEjection = JsonUtil.getObject(rawConfig, "successRateEjection");
if (rawSuccessRateEjection != null) {
SuccessRateEjection.Builder successRateEjectionBuilder = new SuccessRateEjection.Builder();
Integer stdevFactor = JsonUtil.getNumberAsInteger(rawSuccessRateEjection, "stdevFactor");
Integer enforcementPercentage = JsonUtil.getNumberAsInteger(rawSuccessRateEjection,
"enforcementPercentage");
Integer minimumHosts = JsonUtil.getNumberAsInteger(rawSuccessRateEjection, "minimumHosts");
Integer requestVolume = JsonUtil.getNumberAsInteger(rawSuccessRateEjection, "requestVolume");
if (stdevFactor != null) {
successRateEjectionBuilder.setStdevFactor(stdevFactor);
}
if (enforcementPercentage != null) {
successRateEjectionBuilder.setEnforcementPercentage(enforcementPercentage);
}
if (minimumHosts != null) {
successRateEjectionBuilder.setMinimumHosts(minimumHosts);
}
if (requestVolume != null) {
successRateEjectionBuilder.setRequestVolume(requestVolume);
}
configBuilder.setSuccessRateEjection(successRateEjectionBuilder.build());
}
// Failure percentage ejection specific configuration.
Map<String, ?> rawFailurePercentageEjection = JsonUtil.getObject(rawConfig,
"failurePercentageEjection");
if (rawFailurePercentageEjection != null) {
FailurePercentageEjection.Builder failurePercentageEjectionBuilder
= new FailurePercentageEjection.Builder();
Integer threshold = JsonUtil.getNumberAsInteger(rawFailurePercentageEjection, "threshold");
Integer enforcementPercentage = JsonUtil.getNumberAsInteger(rawFailurePercentageEjection,
"enforcementPercentage");
Integer minimumHosts = JsonUtil.getNumberAsInteger(rawFailurePercentageEjection,
"minimumHosts");
Integer requestVolume = JsonUtil.getNumberAsInteger(rawFailurePercentageEjection,
"requestVolume");
if (threshold != null) {
failurePercentageEjectionBuilder.setThreshold(threshold);
}
if (enforcementPercentage != null) {
failurePercentageEjectionBuilder.setEnforcementPercentage(enforcementPercentage);
}
if (minimumHosts != null) {
failurePercentageEjectionBuilder.setMinimumHosts(minimumHosts);
}
if (requestVolume != null) {
failurePercentageEjectionBuilder.setRequestVolume(requestVolume);
}
configBuilder.setFailurePercentageEjection(failurePercentageEjectionBuilder.build());
}
// Child load balancer configuration.
List<LbConfig> childConfigCandidates = ServiceConfigUtil.unwrapLoadBalancingConfigList(
JsonUtil.getListOfObjects(rawConfig, "childPolicy"));
if (childConfigCandidates == null || childConfigCandidates.isEmpty()) {
return ConfigOrError.fromError(Status.INTERNAL.withDescription(
"No child policy in outlier_detection_experimental LB policy: "
+ rawConfig));
}
ConfigOrError selectedConfig =
ServiceConfigUtil.selectLbPolicyFromList(childConfigCandidates,
LoadBalancerRegistry.getDefaultRegistry());
if (selectedConfig.getError() != null) {
return selectedConfig;
}
configBuilder.setChildPolicy((PolicySelection) selectedConfig.getConfig());
return ConfigOrError.fromConfig(configBuilder.build());
}
}