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Implement backends.json for atlas config (#113)
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Michael Graff
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Nov 2, 2017
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57 changes: 57 additions & 0 deletions
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kayenta-atlas/src/main/java/com/netflix/kayenta/atlas/backends/BackendDatabase.java
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| /* | ||
| * Copyright 2017 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. | ||
| */ | ||
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| package com.netflix.kayenta.atlas.backends; | ||
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| import com.netflix.kayenta.atlas.model.Backend; | ||
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| import java.util.*; | ||
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| public class BackendDatabase { | ||
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| private List<Backend> backends = new ArrayList<>(); | ||
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| private boolean matches(Backend backend, String deployment, String dataset, String region, String environment) { | ||
| // return false if it doesn't match the deployment. | ||
| if (!backend.getDeployment().equals(deployment)) | ||
| return false; | ||
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| // return false if it doesn't match the dataset. | ||
| if (!backend.getDataset().equals(dataset)) | ||
| return false; | ||
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| // return false if it doesn't match the region. | ||
| if (backend.getRegions() != null && !backend.getRegions().contains(region)) | ||
| return false; | ||
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| // return false if it doesn't match the environment. | ||
| if (backend.getEnvironments() != null && !backend.getEnvironments().contains(environment)) | ||
| return false; | ||
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| return true; | ||
| } | ||
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| public synchronized Optional<Backend> getOne(String deployment, String dataset, String region, String environment) { | ||
| return backends | ||
| .stream() | ||
| .filter(a -> matches(a, deployment, dataset, region, environment)) | ||
| .findFirst(); | ||
| } | ||
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| public synchronized void update(List<Backend> newBackends) { | ||
| backends = newBackends; | ||
| } | ||
| } |
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kayenta-atlas/src/main/java/com/netflix/kayenta/atlas/backends/BackendUpdater.java
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| package com.netflix.kayenta.atlas.backends; | ||
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| import com.fasterxml.jackson.databind.ObjectMapper; | ||
| import com.netflix.kayenta.atlas.model.Backend; | ||
| import com.netflix.kayenta.atlas.service.BackendsRemoteService; | ||
| import com.netflix.kayenta.retrofit.config.RemoteService; | ||
| import com.netflix.kayenta.retrofit.config.RetrofitClientFactory; | ||
| import com.squareup.okhttp.OkHttpClient; | ||
| import lombok.Builder; | ||
| import lombok.Getter; | ||
| import lombok.extern.slf4j.Slf4j; | ||
| import retrofit.RetrofitError; | ||
| import retrofit.converter.JacksonConverter; | ||
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| import javax.validation.constraints.NotNull; | ||
| import java.util.List; | ||
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| @Slf4j | ||
| @Builder | ||
| public class BackendUpdater { | ||
| @Getter | ||
| private final BackendDatabase backendDatabase = new BackendDatabase(); | ||
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| @NotNull | ||
| private String uri; | ||
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| // If we have retrieved backends.json at least once, we will keep using it forever | ||
| // even if we fail later. It doesn't really change much over time, so this | ||
| // is likely safe enough. | ||
| private boolean succeededAtLeastOnce = false; | ||
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| public boolean run(RetrofitClientFactory retrofitClientFactory, ObjectMapper objectMapper) { | ||
| OkHttpClient okHttpClient = new OkHttpClient(); | ||
| RemoteService remoteService = new RemoteService(); | ||
| remoteService.setBaseUrl(uri); | ||
| BackendsRemoteService backendsRemoteService = retrofitClientFactory.createClient(BackendsRemoteService.class, | ||
| new JacksonConverter(objectMapper), | ||
| remoteService, | ||
| okHttpClient); | ||
| try { | ||
| List<Backend> backends = backendsRemoteService.fetch(); | ||
| backendDatabase.update(backends); | ||
| } catch (RetrofitError e) { | ||
| log.warn("While fetching atlas backends from " + uri, e); | ||
| return succeededAtLeastOnce; | ||
| } | ||
| succeededAtLeastOnce = true; | ||
| return true; | ||
| } | ||
| } |
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kayenta-atlas/src/main/java/com/netflix/kayenta/atlas/backends/BackendUpdaterService.java
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| package com.netflix.kayenta.atlas.backends; | ||
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| import com.fasterxml.jackson.databind.ObjectMapper; | ||
| import com.netflix.kayenta.retrofit.config.RetrofitClientFactory; | ||
| import lombok.extern.slf4j.Slf4j; | ||
| import org.springframework.beans.factory.annotation.Autowired; | ||
| import org.springframework.boot.actuate.health.AbstractHealthIndicator; | ||
| import org.springframework.boot.actuate.health.Health; | ||
| import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty; | ||
| import org.springframework.boot.context.properties.EnableConfigurationProperties; | ||
| import org.springframework.scheduling.annotation.Scheduled; | ||
| import org.springframework.stereotype.Service; | ||
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| import java.util.ArrayList; | ||
| import java.util.List; | ||
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| @Service | ||
| @Slf4j | ||
| @EnableConfigurationProperties | ||
| @ConditionalOnProperty("kayenta.atlas.enabled") | ||
| public class BackendUpdaterService extends AbstractHealthIndicator { | ||
| @Autowired | ||
| private RetrofitClientFactory retrofitClientFactory; | ||
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| @Autowired | ||
| private ObjectMapper objectMapper; | ||
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| private final List<BackendUpdater> backendUpdaters = new ArrayList<>(); | ||
| private int checksCompleted = 0; | ||
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| @Scheduled(initialDelay = 10000, fixedDelay=120000) | ||
| public synchronized void run() { | ||
| // TODO: this will fetch the same uri even if they share the same URI. | ||
| // TODO: It also has locking issues, in that we could hold a lock for a long time. | ||
| // TODO: Locking may not matter as we should rarely, if ever, modify this list. | ||
| // TODO: Although, for healthcheck, it may... | ||
| int checks = 0; | ||
| for (BackendUpdater updater: backendUpdaters) { | ||
| Boolean result = updater.run(retrofitClientFactory, objectMapper); | ||
| if (result) | ||
| checks++; | ||
| } | ||
| checksCompleted = checks; | ||
| } | ||
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| public synchronized void add(BackendUpdater updater) { | ||
| backendUpdaters.add(updater); | ||
| } | ||
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| @Override | ||
| protected synchronized void doHealthCheck(Health.Builder builder) throws Exception { | ||
| if (checksCompleted == backendUpdaters.size()) { | ||
| builder.up(); | ||
| } else { | ||
| builder.down(); | ||
| } | ||
| builder.withDetail("checksCompleted", checksCompleted); | ||
| builder.withDetail("checksExpected", backendUpdaters.size()); | ||
| } | ||
| } |
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