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Export prometheus metrics

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This commit is contained in:
Simon Detheridge 2021-06-21 17:11:49 +01:00
parent d5fa029b54
commit eb9cf6f256
3 changed files with 74 additions and 0 deletions
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18
services/git-bridge/pom.xml
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@ -194,5 +194,23 @@
<artifactId>commons-compress</artifactId>
<version>1.15</version>
</dependency>
<!-- prometheus metrics -->
<dependency>
<groupId>io.prometheus</groupId>
<artifactId>simpleclient</artifactId>
<version>0.10.0</version>
</dependency>
<!-- Hotspot JVM metrics -->
<dependency>
<groupId>io.prometheus</groupId>
<artifactId>simpleclient_hotspot</artifactId>
<version>0.10.0</version>
</dependency>
<!-- Expose metrics via a servlet -->
<dependency>
<groupId>io.prometheus</groupId>
<artifactId>simpleclient_servlet</artifactId>
<version>0.10.0</version>
</dependency>
</dependencies>
</project>

1
services/git-bridge/src/main/java/uk/ac/ic/wlgitbridge/server/GitBridgeServer.java
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@ -127,6 +127,7 @@ public class GitBridgeServer {
handlers.addHandler(new StatusHandler(bridge));
handlers.addHandler(new HealthCheckHandler(bridge));
handlers.addHandler(new GitLfsHandler(bridge));
handlers.addHandler(new PrometheusHandler(bridge));
base.setHandler(handlers);
return base;
}

55
services/git-bridge/src/main/java/uk/ac/ic/wlgitbridge/server/PrometheusHandler.java Normal file
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@ -0,0 +1,55 @@
package uk.ac.ic.wlgitbridge.server;
import io.prometheus.client.exporter.MetricsServlet;
import io.prometheus.client.hotspot.DefaultExports;
import org.eclipse.jetty.server.HttpConnection;
import org.eclipse.jetty.server.Request;
import org.eclipse.jetty.server.handler.AbstractHandler;
import org.eclipse.jetty.servlet.ServletHolder;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import uk.ac.ic.wlgitbridge.bridge.Bridge;
import uk.ac.ic.wlgitbridge.util.Log;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.Arrays;
public class PrometheusHandler extends AbstractHandler {
private final Bridge bridge;
private final MetricsServlet metricsServlet;
private final ServletHolder holder;
public PrometheusHandler(Bridge bridge) {
this.bridge = bridge;
this.metricsServlet = new MetricsServlet();
this.holder = new ServletHolder(metricsServlet);
DefaultExports.initialize();
}
@Override
public void handle(
String target,
Request baseRequest,
HttpServletRequest request,
HttpServletResponse response
) throws IOException, ServletException {
String method = baseRequest.getMethod();
if (
("GET".equals(method))
&& target != null
&& target.matches("^/metrics/?$")
) {
Log.info(method + " <- /metrics");
response.setContentType("application/vnd.git-lfs+json");
response.setStatus(200);
this.holder.handle(baseRequest, request, response);
baseRequest.setHandled(true);
}
}
}