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聊聊nacos的RaftProxy

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本文主要研究一下nacos的RaftProxy

RaftProxy

nacos-1.1.3/naming/src/main/java/com/alibaba/nacos/naming/consistency/persistent/raft/RaftProxy.java

@Component
public class RaftProxy {

    public void proxyGET(String server, String api, Map<String, String> params) throws Exception {
        // do proxy
        if (!server.contains(UtilsAndCommons.IP_PORT_SPLITER)) {
            server = server + UtilsAndCommons.IP_PORT_SPLITER + RunningConfig.getServerPort();
        }
        String url = "http://" + server + RunningConfig.getContextPath() + api;

        HttpClient.HttpResult result =  HttpClient.httpGet(url, null, params);
        if (result.code != HttpURLConnection.HTTP_OK) {
            throw new IllegalStateException("leader failed, caused by: " + result.content);
        }
    }

    public void proxy(String server, String api, Map<String, String> params, HttpMethod method) throws Exception {
        // do proxy
        if (!server.contains(UtilsAndCommons.IP_PORT_SPLITER)) {
            server = server + UtilsAndCommons.IP_PORT_SPLITER + RunningConfig.getServerPort();
        }
        String url = "http://" + server + RunningConfig.getContextPath() + api;
        HttpClient.HttpResult result;
        switch (method) {
            case GET:
                result =  HttpClient.httpGet(url, null, params);
                break;
            case POST:
                result = HttpClient.httpPost(url, null, params);
                break;
            case DELETE:
                result =  HttpClient.httpDelete(url, null, params);
                break;
            default:
                throw new RuntimeException("unsupported method:" + method);
        }

        if (result.code != HttpURLConnection.HTTP_OK) {
            throw new IllegalStateException("leader failed, caused by: " + result.content);
        }
    }

    public void proxyPostLarge(String server, String api, String content, Map<String, String> headers) throws Exception {
        // do proxy
        if (!server.contains(UtilsAndCommons.IP_PORT_SPLITER)) {
            server = server + UtilsAndCommons.IP_PORT_SPLITER + RunningConfig.getServerPort();
        }
        String url = "http://" + server + RunningConfig.getContextPath() + api;

        HttpClient.HttpResult result =  HttpClient.httpPostLarge(url, headers, content);
        if (result.code != HttpURLConnection.HTTP_OK) {
            throw new IllegalStateException("leader failed, caused by: " + result.content);
        }
    }
}

RaftProxy提供了proxyGET、proxy、proxyPostLarge三个方法，其中proxy接收了HttpMethod，可以处理GET、POST、DELETE

HttpClient

nacos-1.1.3/naming/src/main/java/com/alibaba/nacos/naming/misc/HttpClient.java

public class HttpClient {
    private static final int TIME_OUT_MILLIS = 10000;
    private static final int CON_TIME_OUT_MILLIS = 5000;

    private static AsyncHttpClient asyncHttpClient;

    private static CloseableHttpClient postClient;

    static {
        AsyncHttpClientConfig.Builder builder = new AsyncHttpClientConfig.Builder();
        builder.setMaximumConnectionsTotal(-1);
        builder.setMaximumConnectionsPerHost(128);
        builder.setAllowPoolingConnection(true);
        builder.setFollowRedirects(false);
        builder.setIdleConnectionTimeoutInMs(TIME_OUT_MILLIS);
        builder.setConnectionTimeoutInMs(CON_TIME_OUT_MILLIS);
        builder.setCompressionEnabled(true);
        builder.setIOThreadMultiplier(1);
        builder.setMaxRequestRetry(0);
        builder.setUserAgent(UtilsAndCommons.SERVER_VERSION);

        asyncHttpClient = new AsyncHttpClient(builder.build());

        HttpClientBuilder builder2 = HttpClients.custom();
        builder2.setUserAgent(UtilsAndCommons.SERVER_VERSION);
        builder2.setConnectionTimeToLive(CON_TIME_OUT_MILLIS, TimeUnit.MILLISECONDS);
        builder2.setMaxConnPerRoute(-1);
        builder2.setMaxConnTotal(-1);
        builder2.disableAutomaticRetries();

        postClient = builder2.build();
    }

    //......

    public static HttpResult httpPost(String url, List<String> headers, Map<String, String> paramValues) {
        return httpPost(url, headers, paramValues, "UTF-8");
    }

    public static HttpResult httpPost(String url, List<String> headers, Map<String, String> paramValues, String encoding) {
        try {

            HttpPost httpost = new HttpPost(url);

            RequestConfig requestConfig = RequestConfig.custom().setConnectionRequestTimeout(5000).setConnectTimeout(5000).setSocketTimeout(5000).setRedirectsEnabled(true).setMaxRedirects(5).build();
            httpost.setConfig(requestConfig);

            List<NameValuePair> nvps = new ArrayList<NameValuePair>();

            for (Map.Entry<String, String> entry : paramValues.entrySet()) {
                nvps.add(new BasicNameValuePair(entry.getKey(), entry.getValue()));
            }

            httpost.setEntity(new UrlEncodedFormEntity(nvps, encoding));
            HttpResponse response = postClient.execute(httpost);
            HttpEntity entity = response.getEntity();

            String charset = encoding;
            if (entity.getContentType() != null) {

                HeaderElement[] headerElements = entity.getContentType().getElements();

                if (headerElements != null && headerElements.length > 0 && headerElements[0] != null &&
                        headerElements[0].getParameterByName("charset") != null) {
                    charset = headerElements[0].getParameterByName("charset").getValue();
                }
            }

            return new HttpResult(response.getStatusLine().getStatusCode(), IOUtils.toString(entity.getContent(), charset), Collections.<String, String>emptyMap());
        } catch (Throwable e) {
            return new HttpResult(500, e.toString(), Collections.<String, String>emptyMap());
        }
    }

    public static HttpResult httpPostLarge(String url, Map<String, String> headers, String content) {
        try {
            HttpClientBuilder builder = HttpClients.custom();
            builder.setUserAgent(UtilsAndCommons.SERVER_VERSION);
            builder.setConnectionTimeToLive(500, TimeUnit.MILLISECONDS);

            CloseableHttpClient httpClient = builder.build();
            HttpPost httpost = new HttpPost(url);

            for (Map.Entry<String, String> entry : headers.entrySet()) {
                httpost.setHeader(entry.getKey(), entry.getValue());
            }

            httpost.setEntity(new StringEntity(content, ContentType.create("application/json", "UTF-8")));
            HttpResponse response = httpClient.execute(httpost);
            HttpEntity entity = response.getEntity();

            HeaderElement[] headerElements = entity.getContentType().getElements();
            String charset = headerElements[0].getParameterByName("charset").getValue();

            return new HttpResult(response.getStatusLine().getStatusCode(),
                    IOUtils.toString(entity.getContent(), charset), Collections.<String, String>emptyMap());
        } catch (Exception e) {
            return new HttpResult(500, e.toString(), Collections.<String, String>emptyMap());
        }
    }

    //......
}