86 lines
3.4 KiB
Java
86 lines
3.4 KiB
Java
package io.github.ehlxr.did.server.http;
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import io.github.ehlxr.did.common.Constants;
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import io.github.ehlxr.did.common.NettyUtil;
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import io.github.ehlxr.did.common.Result;
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import io.github.ehlxr.did.common.SdkProto;
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import io.github.ehlxr.did.core.SnowFlake;
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import io.netty.channel.Channel;
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import io.netty.channel.ChannelFutureListener;
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import io.netty.channel.ChannelHandlerContext;
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import io.netty.channel.SimpleChannelInboundHandler;
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import io.netty.handler.codec.http.*;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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import java.util.concurrent.Semaphore;
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import java.util.concurrent.TimeUnit;
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/**
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* @author ehlxr
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*/
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public class HttpServerHandler extends SimpleChannelInboundHandler<FullHttpRequest> {
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private final Logger logger = LoggerFactory.getLogger(getClass());
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/**
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* 通过信号量来控制流量
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*/
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private final Semaphore semaphore = new Semaphore(Constants.HANDLE_HTTP_TPS);
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private final SnowFlake snowFlake;
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public HttpServerHandler(SnowFlake snowFlake) {
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this.snowFlake = snowFlake;
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}
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@Override
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protected void channelRead0(ChannelHandlerContext ctx, FullHttpRequest request) throws Exception {
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FullHttpResponse response = new DefaultFullHttpResponse(HttpVersion.HTTP_1_1, HttpResponseStatus.OK);
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response.headers().set(HttpHeaderNames.CONTENT_TYPE, HttpHeaderValues.APPLICATION_JSON);
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Result<?> result;
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HttpResponseStatus status;
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if (!"/did".equals(request.uri())) {
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result = Result.fail(HttpResponseStatus.NOT_FOUND.code(), HttpResponseStatus.NOT_FOUND.reasonPhrase());
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response.setStatus(HttpResponseStatus.NOT_FOUND)
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.content().writeBytes(result.toString().getBytes());
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ctx.writeAndFlush(response).addListener(ChannelFutureListener.CLOSE);
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return;
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}
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if (semaphore.tryAcquire(Constants.ACQUIRE_TIMEOUTMILLIS, TimeUnit.MILLISECONDS)) {
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try {
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long id = snowFlake.nextId();
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logger.info("HttpServerHandler id is: {}", id);
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status = HttpResponseStatus.OK;
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result = Result.success(SdkProto.newBuilder().did(id).build());
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} catch (Exception e) {
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semaphore.release();
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logger.error("HttpServerHandler error", e);
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status = HttpResponseStatus.INTERNAL_SERVER_ERROR;
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result = Result.fail(status.code(), status.reasonPhrase());
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}
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} else {
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String info = String.format("HttpServerHandler tryAcquire semaphore timeout, %dms, waiting thread " + "nums: %d availablePermit: %d",
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Constants.ACQUIRE_TIMEOUTMILLIS, this.semaphore.getQueueLength(), this.semaphore.availablePermits());
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logger.warn(info);
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status = HttpResponseStatus.SERVICE_UNAVAILABLE;
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result = Result.fail(status.code(), info);
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}
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response.setStatus(status)
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.content().writeBytes(result.toString().getBytes());
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ctx.writeAndFlush(response).addListener(ChannelFutureListener.CLOSE);
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}
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@Override
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public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) {
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Channel channel = ctx.channel();
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logger.error("HttpServerHandler channel [{}] error and will be closed", NettyUtil.parseRemoteAddr(channel), cause);
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NettyUtil.closeChannel(channel);
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}
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}
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