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// Copyright 2020 Oath Inc. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package ai.vespa.metricsproxy.telegraf;
import com.google.inject.Inject;
import com.yahoo.component.AbstractComponent;
import com.yahoo.log.LogLevel;
import com.yahoo.system.execution.ProcessExecutor;
import com.yahoo.system.execution.ProcessResult;
import com.yahoo.vespa.defaults.Defaults;
import org.apache.velocity.VelocityContext;
import org.apache.velocity.app.VelocityEngine;
import java.io.FileWriter;
import java.io.InputStreamReader;
import java.io.Reader;
import java.io.Writer;
import java.util.logging.Logger;
import static com.yahoo.yolean.Exceptions.uncheck;
/**
* @author olaa
*/
public class Telegraf extends AbstractComponent {
private static final String TELEGRAF_CONFIG_PATH = "/etc/telegraf/telegraf.conf";
private static final String TELEGRAF_CONFIG_TEMPLATE_PATH = "templates/telegraf.conf.vm";
private static final String TELEGRAF_LOG_FILE_PATH = Defaults.getDefaults().underVespaHome("logs/telegraf/telegraf.log");
private final TelegrafRegistry telegrafRegistry;
private static final Logger logger = Logger.getLogger(Telegraf.class.getName());
@Inject
public Telegraf(TelegrafRegistry telegrafRegistry, TelegrafConfig telegrafConfig) {
this.telegrafRegistry = telegrafRegistry;
telegrafRegistry.addInstance(this);
writeConfig(telegrafConfig, uncheck(() -> new FileWriter(TELEGRAF_CONFIG_PATH)));
restartTelegraf();
}
protected static void writeConfig(TelegrafConfig telegrafConfig, Writer writer) {
VelocityContext context = new VelocityContext();
context.put("logFilePath", TELEGRAF_LOG_FILE_PATH);
context.put("intervalSeconds", telegrafConfig.intervalSeconds());
context.put("cloudwatchPlugins", telegrafConfig.cloudWatch());
context.put("protocol", telegrafConfig.isHostedVespa() ? "https" : "http");
// TODO: Add node cert if hosted
VelocityEngine velocityEngine = new VelocityEngine();
velocityEngine.init();
velocityEngine.evaluate(context, writer, "TelegrafConfigWriter", getTemplateReader());
uncheck(writer::close);
}
private void restartTelegraf() {
executeCommand("service telegraf restart");
}
private void stopTelegraf() {
executeCommand("service telegraf stop");
}
private void executeCommand(String command) {
logger.info(String.format("Running command: %s", command));
ProcessExecutor processExecutor = new ProcessExecutor
.Builder(10)
.successExitCodes(0)
.build();
ProcessResult processResult = uncheck(() -> processExecutor.execute(command))
.orElseThrow(() -> new RuntimeException("Timed out running command: " + command));
logger.log(LogLevel.DEBUG, () -> String.format("Exit code: %d\nstdOut: %s\nstdErr: %s",
processResult.exitCode,
processResult.stdOut,
processResult.stdErr));
if (!processResult.stdErr.isBlank())
logger.warning(String.format("stdErr not empty: %s", processResult.stdErr));
}
@SuppressWarnings("ConstantConditions")
private static Reader getTemplateReader() {
return new InputStreamReader(Telegraf.class.getClassLoader()
.getResourceAsStream(TELEGRAF_CONFIG_TEMPLATE_PATH)
);
}
@Override
public void deconstruct() {
telegrafRegistry.removeInstance(this);
if (telegrafRegistry.isEmpty()) {
stopTelegraf();
}
}
}
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