com.netflix.genie.web.selectors.impl.ScriptCommandSelectorImpl Maven / Gradle / Ivy
/*
*
* Copyright 2020 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.genie.web.selectors.impl;
import com.google.common.collect.Sets;
import com.netflix.genie.common.internal.dtos.Command;
import com.netflix.genie.web.dtos.ResourceSelectionResult;
import com.netflix.genie.web.exceptions.checked.ResourceSelectionException;
import com.netflix.genie.web.scripts.CommandSelectorManagedScript;
import com.netflix.genie.web.scripts.ResourceSelectorScriptResult;
import com.netflix.genie.web.selectors.CommandSelectionContext;
import com.netflix.genie.web.selectors.CommandSelector;
import com.netflix.genie.web.util.MetricsConstants;
import com.netflix.genie.web.util.MetricsUtils;
import io.micrometer.core.instrument.MeterRegistry;
import io.micrometer.core.instrument.Tag;
import lombok.extern.slf4j.Slf4j;
import javax.validation.Valid;
import java.util.Optional;
import java.util.Set;
import java.util.concurrent.TimeUnit;
/**
* Implementation of {@link CommandSelector} which defers the decision to a script provided by the system
* administrators.
*
* @author tgianos
* @since 4.0.0
*/
@Slf4j
public class ScriptCommandSelectorImpl implements CommandSelector {
static final String SELECT_TIMER_NAME = "genie.selectors.command.script.select.timer";
private static final String NULL_TAG = "null";
private static final String NULL_RATIONALE = "Script returned no command, no preference";
private final CommandSelectorManagedScript commandSelectorManagedScript;
private final MeterRegistry registry;
/**
* Constructor.
*
* @param commandSelectorManagedScript The {@link CommandSelectorManagedScript} instance to use
* @param registry The {@link MeterRegistry} to use
*/
public ScriptCommandSelectorImpl(
final CommandSelectorManagedScript commandSelectorManagedScript,
final MeterRegistry registry
) {
this.commandSelectorManagedScript = commandSelectorManagedScript;
this.registry = registry;
}
/**
* {@inheritDoc}
*/
@Override
public ResourceSelectionResult select(
@Valid final CommandSelectionContext context
) throws ResourceSelectionException {
final long selectStart = System.nanoTime();
final String jobId = context.getJobId();
final Set resources = context.getResources();
log.debug("Called to select a command from {} for job {}", resources, jobId);
final Set tags = Sets.newHashSet();
final ResourceSelectionResult.Builder builder = new ResourceSelectionResult.Builder<>(this.getClass());
try {
final ResourceSelectorScriptResult result
= this.commandSelectorManagedScript.selectResource(context);
MetricsUtils.addSuccessTags(tags);
final Optional commandOptional = result.getResource();
if (!commandOptional.isPresent()) {
final String rationale = result.getRationale().orElse(NULL_RATIONALE);
log.debug("No command selected due to: {}", rationale);
tags.add(Tag.of(MetricsConstants.TagKeys.COMMAND_ID, NULL_TAG));
builder.withSelectionRationale(rationale);
return builder.build();
}
final Command selectedCommand = commandOptional.get();
tags.add(Tag.of(MetricsConstants.TagKeys.COMMAND_ID, selectedCommand.getId()));
tags.add(Tag.of(MetricsConstants.TagKeys.COMMAND_NAME, selectedCommand.getMetadata().getName()));
return builder
.withSelectionRationale(result.getRationale().orElse(null))
.withSelectedResource(selectedCommand)
.build();
} catch (final Throwable e) {
final String errorMessage = "Command selection error: " + e.getMessage();
log.error(errorMessage, e);
MetricsUtils.addFailureTagsWithException(tags, e);
if (e instanceof ResourceSelectionException) {
throw e;
} else {
throw new ResourceSelectionException(e);
}
} finally {
this.registry
.timer(SELECT_TIMER_NAME, tags)
.record(System.nanoTime() - selectStart, TimeUnit.NANOSECONDS);
}
}
}