| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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 org.apache.pulsar.functions.worker.rest.api; |
| |
| import io.netty.buffer.ByteBuf; |
| import io.netty.buffer.ByteBufAllocator; |
| import io.prometheus.client.CollectorRegistry; |
| import io.prometheus.client.exporter.common.TextFormat; |
| import java.io.IOException; |
| import java.io.Writer; |
| import java.nio.CharBuffer; |
| import java.nio.charset.StandardCharsets; |
| import javax.ws.rs.GET; |
| import javax.ws.rs.Path; |
| import javax.ws.rs.Produces; |
| import javax.ws.rs.core.MediaType; |
| import javax.ws.rs.core.Response; |
| import javax.ws.rs.core.StreamingOutput; |
| import org.apache.pulsar.common.util.SimpleTextOutputStream; |
| import org.apache.pulsar.functions.worker.WorkerService; |
| import org.apache.pulsar.functions.worker.rest.FunctionApiResource; |
| |
| @Path("/") |
| public class FunctionsMetricsResource extends FunctionApiResource { |
| @Path("metrics") |
| @GET |
| @Produces(MediaType.TEXT_PLAIN) |
| public Response getMetrics() throws IOException { |
| |
| WorkerService workerService = get(); |
| ByteBuf buf = ByteBufAllocator.DEFAULT.heapBuffer(); |
| // if request, also attach the prometheus metrics |
| if (workerService.getWorkerConfig().isIncludeStandardPrometheusMetrics()) { |
| Writer writer = new BufWriter(buf); |
| TextFormat.write004(writer, CollectorRegistry.defaultRegistry.metricFamilySamples()); |
| } |
| |
| try { |
| SimpleTextOutputStream stream = new SimpleTextOutputStream(buf); |
| workerService.generateFunctionsStats(stream); |
| byte[] payload = buf.array(); |
| int arrayOffset = buf.arrayOffset(); |
| int readableBytes = buf.readableBytes(); |
| StreamingOutput streamOut = out -> { |
| out.write(payload, arrayOffset, readableBytes); |
| out.flush(); |
| }; |
| return Response |
| .ok(streamOut) |
| .type(MediaType.TEXT_PLAIN_TYPE) |
| .build(); |
| } finally { |
| buf.release(); |
| } |
| } |
| |
| private static class BufWriter extends Writer { |
| private final ByteBuf buf; |
| |
| public BufWriter(ByteBuf buf) { |
| this.buf = buf; |
| } |
| |
| @Override |
| public void write(char[] cbuf, int off, int len) throws IOException { |
| buf.writeCharSequence(CharBuffer.wrap(cbuf, off, len), StandardCharsets.UTF_8); |
| } |
| |
| @Override |
| public void flush() throws IOException { |
| // noop |
| |
| } |
| |
| @Override |
| public void close() throws IOException { |
| // noop |
| } |
| } |
| } |