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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.vespa.config.server.application;
import com.yahoo.collections.Pair;
import com.yahoo.component.Version;
import com.yahoo.config.ConfigInstance;
import com.yahoo.config.ConfigurationRuntimeException;
import com.yahoo.config.model.api.ApplicationInfo;
import com.yahoo.config.model.api.Model;
import com.yahoo.config.provision.ApplicationId;
import com.yahoo.text.AbstractUtf8Array;
import com.yahoo.vespa.config.ConfigCacheKey;
import com.yahoo.vespa.config.ConfigDefinitionKey;
import com.yahoo.vespa.config.ConfigKey;
import com.yahoo.vespa.config.ConfigPayload;
import com.yahoo.vespa.config.ConfigPayloadBuilder;
import com.yahoo.vespa.config.GenericConfig;
import com.yahoo.vespa.config.GetConfigRequest;
import com.yahoo.vespa.config.buildergen.ConfigDefinition;
import com.yahoo.vespa.config.protocol.ConfigResponse;
import com.yahoo.vespa.config.protocol.DefContent;
import com.yahoo.vespa.config.server.ServerCache;
import com.yahoo.vespa.config.server.UnknownConfigDefinitionException;
import com.yahoo.vespa.config.server.modelfactory.ModelResult;
import com.yahoo.vespa.config.server.monitoring.MetricUpdater;
import com.yahoo.vespa.config.server.rpc.ConfigResponseFactory;
import com.yahoo.vespa.config.server.rpc.UncompressedConfigResponseFactory;
import com.yahoo.vespa.config.server.tenant.TenantRepository;
import com.yahoo.vespa.config.util.ConfigUtils;
import com.yahoo.yolean.Exceptions;
import java.util.logging.Level;
import java.util.Objects;
import java.util.Set;
/**
* A Vespa application for a specific version of Vespa. It holds data and metadata associated with
* a Vespa application, i.e. generation, model and zookeeper data, as well as methods for resolving config
* and other queries against the model.
*
* @author hmusum
*/
public class Application implements ModelResult {
private static final java.util.logging.Logger log = java.util.logging.Logger.getLogger(Application.class.getName());
/** The config generation for this application. */
private final long applicationGeneration;
private final Version vespaVersion;
private final Model model;
private final ServerCache cache;
private final MetricUpdater metricUpdater;
private final ApplicationId app;
public Application(Model model, ServerCache cache, long applicationGeneration,
Version vespaVersion, MetricUpdater metricUpdater, ApplicationId app) {
Objects.requireNonNull(model, "The model cannot be null");
this.model = model;
this.cache = cache;
this.applicationGeneration = applicationGeneration;
this.vespaVersion = vespaVersion;
this.metricUpdater = metricUpdater;
this.app = app;
}
/** Returns the generation for the config we are currently serving. */
public Long getApplicationGeneration() { return applicationGeneration; }
/** Returns the application model, never null */
@Override
public Model getModel() { return model; }
@Override
public String toString() {
StringBuilder sb = new StringBuilder();
sb.append("application '").append(app.application().value()).append("', ");
sb.append("generation ").append(applicationGeneration).append(", ");
sb.append("vespa version ").append(vespaVersion);
return sb.toString();
}
public ApplicationInfo toApplicationInfo() {
return new ApplicationInfo(app, applicationGeneration, model);
}
public ServerCache getCache() {
return cache;
}
public ApplicationId getId() {
return app;
}
public Version getVespaVersion() {
return vespaVersion;
}
/**
* Gets a config from ZK. Returns null if not found.
*/
public ConfigResponse resolveConfig(GetConfigRequest req, ConfigResponseFactory responseFactory) {
long start = System.currentTimeMillis();
metricUpdater.incrementRequests();
ConfigKey<?> configKey = req.getConfigKey();
String defMd5 = req.getRequestDefMd5();
if (defMd5 == null || defMd5.isEmpty()) {
defMd5 = ConfigUtils.getDefMd5(req.getDefContent().asList());
}
ConfigCacheKey cacheKey = new ConfigCacheKey(configKey, defMd5);
log.log(Level.FINE, () -> TenantRepository.logPre(getId()) + ("Resolving config " + cacheKey));
ConfigResponse config;
if (useCache(req)) {
config = cache.computeIfAbsent(cacheKey, (ConfigCacheKey key) -> {
var response = createConfigResponse(configKey, req, responseFactory);
metricUpdater.setCacheConfigElems(cache.configElems());
metricUpdater.setCacheChecksumElems(cache.checkSumElems());
return response;
});
} else {
config = createConfigResponse(configKey, req, responseFactory);
}
metricUpdater.incrementProcTime(System.currentTimeMillis() - start);
return config;
}
private ConfigResponse createConfigResponse(ConfigKey<?> configKey, GetConfigRequest req, ConfigResponseFactory responseFactory) {
ConfigDefinition def = getTargetDef(req);
if (def == null) {
metricUpdater.incrementFailedRequests();
throw new UnknownConfigDefinitionException("Unable to find config definition for '" + configKey.getNamespace() + "." + configKey.getName());
}
log.log(Level.FINE, () -> TenantRepository.logPre(getId()) + "Resolving " + configKey + " with config definition " + def);
var payload = createPayload(configKey, def);
return responseFactory.createResponse(payload.getFirst(), applicationGeneration, payload.getSecond(), req.configPayloadChecksums());
}
private Pair<AbstractUtf8Array, Boolean> createPayload(ConfigKey<?> configKey, ConfigDefinition def) {
try {
ConfigInstance.Builder builder = model.getConfigInstance(configKey, def);
boolean tempApplyOnRestart = builder.getApplyOnRestart();
if (builder instanceof GenericConfig.GenericConfigBuilder) {
return new Pair<>(((GenericConfig.GenericConfigBuilder) builder).getPayload().toUtf8Array(true),
tempApplyOnRestart);
}
else {
String cacheBuilderClassNameForErrorReport = builder.getClass().getName();
ConfigPayload payload;
boolean applyOnRestart = false;
try {
ConfigInstance instance = ConfigInstanceBuilder.buildInstance(builder, def.getCNode());
payload = ConfigPayload.fromInstance(instance);
applyOnRestart = tempApplyOnRestart;
} catch (ConfigurationRuntimeException e) {
// This can happen in cases where services ask for config that no longer exist before they have been able
// to reconfigure themselves
log.log(Level.INFO, TenantRepository.logPre(getId()) +
": Error resolving instance for builder '" + cacheBuilderClassNameForErrorReport +
"', returning empty config: " + Exceptions.toMessageString(e));
payload = ConfigPayload.fromBuilder(new ConfigPayloadBuilder());
}
if (def.getCNode() != null)
payload.applyDefaultsFromDef(def.getCNode());
return new Pair<>(payload.toUtf8Array(true), applyOnRestart);
}
} catch (Exception e) {
throw new ConfigurationRuntimeException("Unable to get config for " + app, e);
}
}
private boolean useCache(GetConfigRequest request) {
return !request.noCache();
}
private ConfigDefinition getTargetDef(GetConfigRequest req) {
ConfigKey<?> configKey = req.getConfigKey();
DefContent def = req.getDefContent();
ConfigDefinitionKey configDefinitionKey = new ConfigDefinitionKey(configKey.getName(), configKey.getNamespace());
if (def.isEmpty()) {
log.log(Level.FINE, () -> TenantRepository.logPre(getId()) + ("No config schema in request for " + configKey));
return cache.getDef(configDefinitionKey);
} else {
log.log(Level.FINE, () -> TenantRepository.logPre(getId()) + ("Got config schema from request, length:" + def.asList().size() + " : " + configKey));
return new ConfigDefinition(configKey.getName(), def.asStringArray());
}
}
void updateHostMetrics(int numHosts) {
metricUpdater.setHosts(numHosts);
}
// For testing only
ConfigResponse resolveConfig(GetConfigRequest req) {
return resolveConfig(req, new UncompressedConfigResponseFactory());
}
public Set<ConfigKey<?>> allConfigsProduced() {
return model.allConfigsProduced();
}
public Set<String> allConfigIds() {
return model.allConfigIds();
}
}
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