[GitHub] nicolaferraro commented on a change in pull request #22: Add runtime health endpoint

[GitBox <gi...@apache.org>]

nicolaferraro commented on a change in pull request #22: Add runtime health endpoint
URL: https://github.com/apache/camel-k-runtime/pull/22#discussion_r261432125
 
 

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 File path: camel-k-runtime-health/src/main/java/org/apache/camel/k/health/HealthEndpoint.java
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 @@ -0,0 +1,130 @@
+/**
+ * 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.camel.k.health;
+
+import java.util.Objects;
+
+import io.netty.bootstrap.ServerBootstrap;
+import io.netty.buffer.ByteBuf;
+import io.netty.buffer.Unpooled;
+import io.netty.channel.Channel;
+import io.netty.channel.ChannelFutureListener;
+import io.netty.channel.ChannelHandlerContext;
+import io.netty.channel.ChannelInitializer;
+import io.netty.channel.EventLoopGroup;
+import io.netty.channel.SimpleChannelInboundHandler;
+import io.netty.channel.nio.NioEventLoopGroup;
+import io.netty.channel.socket.SocketChannel;
+import io.netty.channel.socket.nio.NioServerSocketChannel;
+import io.netty.handler.codec.http.DefaultFullHttpResponse;
+import io.netty.handler.codec.http.FullHttpResponse;
+import io.netty.handler.codec.http.HttpRequest;
+import io.netty.handler.codec.http.HttpResponseStatus;
+import io.netty.handler.codec.http.HttpServerCodec;
+import io.netty.handler.codec.http.HttpServerExpectContinueHandler;
+import io.netty.handler.codec.http.HttpVersion;
+import io.netty.handler.logging.LogLevel;
+import io.netty.handler.logging.LoggingHandler;
+import io.netty.util.AsciiString;
+import org.apache.camel.CamelContext;
+import org.apache.camel.ServiceStatus;
+import org.apache.camel.support.ServiceSupport;
+
+public class HealthEndpoint extends ServiceSupport {
+    private static final AsciiString CONTENT_TYPE = AsciiString.cached("Content-Type");
+    private static final AsciiString CONTENT_LENGTH = AsciiString.cached("Content-Length");
+    private static final byte[] OK = {'O', 'K'};
+    private static final byte[] KO = {'K', 'O'};
+
+    private final CamelContext context;
+    private final String bindHost;
+    private final int bindPort;
+    private final String path;
+
+    private EventLoopGroup bossGroup;
+    private EventLoopGroup workerGroup;
+    private Channel channel;
+
+    public HealthEndpoint(CamelContext context, String bindHost, int bindPort, String path) {
+        this.context = context;
+        this.bindHost = bindHost;
+        this.bindPort = bindPort;
+        this.path = path;
+    }
+
+    @Override
+    protected void doStart() throws Exception {
+        bossGroup = new NioEventLoopGroup(1);
+        workerGroup = new NioEventLoopGroup();
+
+        ServerBootstrap b = new ServerBootstrap();
+        b.group(bossGroup, workerGroup)
+            .channel(NioServerSocketChannel.class)
+            .handler(new LoggingHandler(LogLevel.DEBUG))
+            .childHandler(new ChannelInitializer<SocketChannel>() {
+                @Override
+                protected void initChannel(SocketChannel ch) throws Exception {
+                    ch.pipeline()
+                        .addLast(new HttpServerCodec())
+                        .addLast(new HttpServerExpectContinueHandler())
+                        .addLast(new Handler());
+                }
+            });
+
+        channel = b.bind(bindHost, bindPort).channel();
+    }
+
+    @Override
+    protected void doStop() throws Exception {
+        if (bossGroup != null) {
+            bossGroup.shutdownGracefully();
+        }
+        if (workerGroup != null) {
+            workerGroup.shutdownGracefully();
+        }
+    }
+
+    private class Handler extends SimpleChannelInboundHandler<HttpRequest> {
+        @Override
+        public void channelReadComplete(ChannelHandlerContext ctx) {
+            ctx.flush();
+        }
+
+        @Override
+        protected void channelRead0(ChannelHandlerContext ctx, HttpRequest msg) throws Exception {
+            HttpResponseStatus status;
+            ByteBuf content;
+
+            if (!Objects.equals(path, msg.uri())) {
+                status = HttpResponseStatus.NOT_FOUND;
+                content = Unpooled.wrappedBuffer(KO);
+            } else if (context.getStatus() == ServiceStatus.Started) {
 
 Review comment:
   Is this true when routes are down for master-component/routepolicy?

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