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Enhance the ability to forward requests from Meta to the main Meta
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166 changes: 166 additions & 0 deletions
166
...c/main/java/com/alipay/sofa/registry/server/meta/resource/filter/LeaderForwardFilter.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,166 @@ | ||
| package com.alipay.sofa.registry.server.meta.resource.filter; | ||
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| import com.alipay.sofa.registry.log.Logger; | ||
| import com.alipay.sofa.registry.log.LoggerFactory; | ||
| import com.alipay.sofa.registry.server.meta.MetaLeaderService; | ||
| import com.google.common.annotations.VisibleForTesting; | ||
| import org.apache.commons.collections.CollectionUtils; | ||
| import org.apache.commons.io.IOUtils; | ||
| import org.apache.commons.lang.StringUtils; | ||
| import org.eclipse.jetty.http.HttpStatus; | ||
| import org.springframework.beans.factory.annotation.Autowired; | ||
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| import javax.annotation.Priority; | ||
| import javax.ws.rs.Priorities; | ||
| import javax.ws.rs.container.ContainerRequestContext; | ||
| import javax.ws.rs.container.ContainerRequestFilter; | ||
| import javax.ws.rs.core.MultivaluedMap; | ||
| import javax.ws.rs.core.Response; | ||
| import javax.ws.rs.core.UriInfo; | ||
| import javax.ws.rs.ext.Provider; | ||
| import java.io.ByteArrayOutputStream; | ||
| import java.io.IOException; | ||
| import java.io.InputStream; | ||
| import java.io.OutputStream; | ||
| import java.net.HttpURLConnection; | ||
| import java.net.URI; | ||
| import java.net.URL; | ||
| import java.util.List; | ||
| import java.util.concurrent.TimeUnit; | ||
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| /** | ||
| * @author huicha | ||
| * @date 2024/12/24 | ||
| */ | ||
| @Provider | ||
| @LeaderForwardRestController | ||
| @Priority(Priorities.USER) | ||
| public class LeaderForwardFilter implements ContainerRequestFilter { | ||
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| private Logger LOGGER = LoggerFactory.getLogger(LeaderForwardFilter.class, "[LeaderForwardFilter]"); | ||
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| @Autowired | ||
| private MetaLeaderService metaLeaderService; | ||
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| @Override | ||
| public void filter(ContainerRequestContext requestContext) throws IOException { | ||
| if (metaLeaderService.amILeader()) { | ||
| return; | ||
| } | ||
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| String leaderAddr = metaLeaderService.getLeader(); | ||
| if (StringUtils.isBlank(leaderAddr)) { | ||
| Response response = | ||
| Response.status(Response.Status.INTERNAL_SERVER_ERROR) | ||
| .header("reason", "no leader found") | ||
| .build(); | ||
| requestContext.abortWith(response); | ||
| return; | ||
| } | ||
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| this.proxyRequestToMetaLeader(requestContext, leaderAddr); | ||
| } | ||
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| /** | ||
| * 当前 Meta 不是 Leader，将请求转发到 Meta Leader 中 | ||
| * 这里没考虑直接使用 Http Client 是因为使用到这个 Filter 的基本都是配置下发链路 | ||
| * 属于旁路，不需要链接池、内存池等各种资源，因此就不想引入其他依赖了，只使用了 Java 原生的 | ||
| * 方法，链接也是使用到的时候再主动去链 | ||
| */ | ||
| private void proxyRequestToMetaLeader(ContainerRequestContext requestContext, String leaderAddr) { | ||
| HttpURLConnection connection = null; | ||
| try { | ||
| // 1. 获取请求信息 | ||
| String method = requestContext.getMethod(); | ||
| boolean hasEntity = requestContext.hasEntity(); | ||
| MultivaluedMap<String, String> headers = requestContext.getHeaders(); | ||
| UriInfo uriInfo = requestContext.getUriInfo(); | ||
| URI requestURI = uriInfo.getAbsolutePath(); | ||
| int requestPort = requestURI.getPort(); | ||
| String requestPath = requestURI.getRawPath(); | ||
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| // 2. 拼接发送给 Meta Leader 的请求地址 | ||
| String newRequestURLStr = String.format("http://%s:%d%s", leaderAddr, requestPort, requestPath); | ||
| URL newRequestURL = new URL(newRequestURLStr); | ||
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| // 3. 打开链接，这里因为协议写死是 HTTP 协议，所以拿到的必然是 HttpURLConnection | ||
| connection = (HttpURLConnection) newRequestURL.openConnection(); | ||
| connection.setRequestMethod(method); | ||
| if (hasEntity) { | ||
| connection.setDoOutput(true); | ||
| } | ||
| connection.setDoInput(true); | ||
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| // 设置超时时间 | ||
| connection.setConnectTimeout((int) TimeUnit.SECONDS.toMillis(1)); | ||
| connection.setReadTimeout((int) TimeUnit.SECONDS.toMillis(3)); | ||
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| // 设置请求头 | ||
| for (MultivaluedMap.Entry<String, List<String>> entry : headers.entrySet()) { | ||
| String headerKey = entry.getKey(); | ||
| List<String> headerValues = entry.getValue(); | ||
| if (CollectionUtils.isNotEmpty(headerValues)) { | ||
| connection.addRequestProperty(headerKey, headerValues.get(0)); | ||
| } | ||
| } | ||
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| connection.connect(); | ||
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| // 4. 发送请求，直接做一次拷贝 | ||
| if (hasEntity) { | ||
| try ( | ||
| OutputStream outputStream = connection.getOutputStream(); | ||
| InputStream inputStream = requestContext.getEntityStream() | ||
| ) { | ||
| IOUtils.copy(inputStream, outputStream); | ||
| } | ||
| } | ||
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| // 5. 接收响应 | ||
| int responseCode = connection.getResponseCode(); | ||
| if (responseCode != HttpStatus.OK_200) { | ||
| LOGGER.error("Proxy request to meta leader fail, response code: {}, message: {}", responseCode, connection.getResponseMessage()); | ||
| Response response = | ||
| Response.status(Response.Status.INTERNAL_SERVER_ERROR) | ||
| .header("reason", "proxy request to meta leader fail: " + connection.getResponseMessage()) | ||
| .build(); | ||
| requestContext.abortWith(response); | ||
| return; | ||
| } | ||
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| // 读取数据 | ||
| try ( | ||
| InputStream inputStream = connection.getInputStream(); | ||
| ByteArrayOutputStream outputStream = new ByteArrayOutputStream(1024); | ||
| ) { | ||
| IOUtils.copy(inputStream, outputStream); | ||
| byte[] responseData = outputStream.toByteArray(); | ||
| Response response = Response.ok(responseData).build(); | ||
| requestContext.abortWith(response); | ||
| } | ||
| } catch (Throwable throwable) { | ||
| LOGGER.error("Proxy request to meta leader exception, meta leader address: {}", leaderAddr, throwable); | ||
| Response response = | ||
| Response.status(Response.Status.INTERNAL_SERVER_ERROR) | ||
| .header("reason", "proxy request to meta leader exception") | ||
| .build(); | ||
| requestContext.abortWith(response); | ||
| } finally { | ||
| if (null != connection) { | ||
| try { | ||
| connection.disconnect(); | ||
| } catch (Throwable throwable) { | ||
| // 吃掉异常 | ||
| LOGGER.error("Disconnect connection to meta leader fail, meta leader address: {}", leaderAddr, throwable); | ||
| } | ||
| } | ||
| } | ||
| } | ||
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| @VisibleForTesting | ||
| public LeaderForwardFilter setMetaLeaderService(MetaLeaderService metaLeaderService) { | ||
| this.metaLeaderService = metaLeaderService; | ||
| return this; | ||
| } | ||
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| } |
16 changes: 16 additions & 0 deletions
16
...ava/com/alipay/sofa/registry/server/meta/resource/filter/LeaderForwardRestController.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,16 @@ | ||
| package com.alipay.sofa.registry.server.meta.resource.filter; | ||
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| import javax.ws.rs.NameBinding; | ||
| import java.lang.annotation.ElementType; | ||
| import java.lang.annotation.Retention; | ||
| import java.lang.annotation.RetentionPolicy; | ||
| import java.lang.annotation.Target; | ||
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| /** | ||
| * @author huicha | ||
| * @date 2024/12/24 | ||
| */ | ||
| @NameBinding | ||
| @Target({ElementType.TYPE, ElementType.METHOD}) | ||
| @Retention(value = RetentionPolicy.RUNTIME) | ||
| public @interface LeaderForwardRestController {} |
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