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Just enough Groovy code to implement a GET'able HTTP server with regex based path routing.
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| import org.jboss.netty.bootstrap.ServerBootstrap | |
| import org.jboss.netty.buffer.ChannelBuffers | |
| import org.jboss.netty.channel.ChannelHandlerContext | |
| import org.jboss.netty.channel.ChannelPipeline | |
| import org.jboss.netty.channel.ChannelPipelineFactory | |
| import org.jboss.netty.channel.Channels | |
| import org.jboss.netty.channel.MessageEvent | |
| import org.jboss.netty.channel.SimpleChannelUpstreamHandler | |
| import org.jboss.netty.channel.socket.nio.NioServerSocketChannelFactory | |
| import org.jboss.netty.handler.codec.http.DefaultHttpResponse | |
| import org.jboss.netty.handler.codec.http.HttpHeaders | |
| import org.jboss.netty.handler.codec.http.HttpMethod | |
| import org.jboss.netty.handler.codec.http.HttpRequest | |
| import org.jboss.netty.handler.codec.http.HttpResponse | |
| import org.jboss.netty.handler.codec.http.HttpResponseStatus | |
| import org.jboss.netty.handler.codec.http.HttpServerCodec | |
| import org.jboss.netty.handler.codec.http.HttpVersion | |
| import org.slf4j.Logger | |
| import org.slf4j.LoggerFactory | |
| class SmallServer { | |
| protected static Logger logger = LoggerFactory.getLogger(SmallServer) | |
| protected final routes = [ | |
| '/content.json': { req -> | |
| '{"field":"value"}' | |
| }, | |
| '/': { | |
| """<body> | |
| Success. Here's <a href='/missing'>a link to missing content</a> | |
| </body> | |
| """ | |
| } | |
| ] | |
| protected static HttpResponse createBadResponse(HttpResponseStatus status) { | |
| def response = new DefaultHttpResponse(HttpVersion.HTTP_1_0, status) | |
| response.addHeader(HttpHeaders.Names.CONTENT_LENGTH, 0) | |
| return response | |
| } | |
| int startServer() { | |
| final def us = this | |
| ServerBootstrap serverBootstrap = new ServerBootstrap(new NioServerSocketChannelFactory()) | |
| serverBootstrap.pipelineFactory = new ChannelPipelineFactory() { | |
| ChannelPipeline getPipeline() throws Exception { | |
| Channels.pipeline(new HttpServerCodec(), new SimpleChannelUpstreamHandler() { | |
| void messageReceived(ChannelHandlerContext ctx, MessageEvent evt) throws Exception { | |
| if (evt.message instanceof HttpRequest && evt.message.method == HttpMethod.GET) { | |
| HttpRequest req = evt.message | |
| def routeHandlerEntry = us.routes.find { it.key.isCase(req.uri) } | |
| if (routeHandlerEntry) { | |
| SmallServer.logger.info("Routing ${req.uri}") | |
| def response = new DefaultHttpResponse(HttpVersion.HTTP_1_0, HttpResponseStatus.OK) | |
| try { | |
| def stringContent = routeHandlerEntry.value.call(req) | |
| def content = ChannelBuffers.copiedBuffer(stringContent, Charset.forName('UTF-8')) | |
| response.content = content | |
| response.addHeader(HttpHeaders.Names.CONTENT_LENGTH, content.readableBytes()) | |
| if (stringContent[0] in ['<']) { | |
| response.addHeader(HttpHeaders.Names.CONTENT_TYPE, 'text/html') | |
| } | |
| else if (stringContent[0] in ['[','{']) { | |
| response.addHeader(HttpHeaders.Names.CONTENT_TYPE, 'application/json') | |
| } | |
| evt.channel.write(response) | |
| } | |
| catch (Exception e) { | |
| SmallServer.logger.error("Handler ${req.uri} failed", e) | |
| evt.channel.write(createBadResponse(HttpResponseStatus.INTERNAL_SERVER_ERROR)) | |
| } | |
| } | |
| else { | |
| SmallServer.logger.warn("Not found: ${req.uri}") | |
| evt.channel.write(createBadResponse(HttpResponseStatus.NOT_FOUND)) | |
| } | |
| } | |
| else { | |
| SmallServer.logger.warn("Bad request: ${req}") | |
| evt.channel.write(createBadResponse(HttpResponseStatus.BAD_REQUEST)) | |
| } | |
| } | |
| }) | |
| } | |
| } | |
| def serverPort = serverBootstrap.bind(new InetSocketAddress(0)).localAddress.port | |
| println "Server is ready at http://localhost:${serverPort}" | |
| } | |
| } |
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