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DorisStreamLoadObserver 类是一个用于将数据加载到 Doris（以前称为 Palo）数据库中并监视加载过程的 Java 类。该类提供了一组方法，用于构建 HTTP 请求、处理 HTTP 响应以及监控数据加载的状态。以下是每个方法的具体作用：

1. DorisStreamLoadObserver(Keys options): 这是类的构造函数，用于初始化加载数据所需的配置选项。
2. void streamLoad(WriterTuple data) throws Exception: 该方法是数据加载的主要方法。它将给定的数据（WriterTuple 对象）加载到 Doris 数据库中。它构建了用于将数据发送到 Doris 的 HTTP 请求，并根据响应状态来确定加载是否成功。如果加载失败，它会抛出异常。
3. private void checkStreamLoadState(String host, String label) throws IOException: 这个方法用于检查数据加载的状态。它会不断地轮询 Doris 服务器，以获取特定加载任务的最终状态。根据加载状态的不同，它可能会抛出异常或者在加载完成时返回。
4. private byte[] addRows(List<byte[]> rows, int totalBytes): 此方法根据给定的数据行和总字节数，构建用于加载的字节数组。它根据配置中的数据格式（CSV 或 JSON）将数据行连接起来，并添加适当的分隔符。
5. private Map<String, Object> put(String loadUrl, String label, byte[] data) throws IOException: 该方法执行 HTTP PUT 请求，将数据加载到 Doris 数据库中。它构建了包含数据的请求实体，发送到指定的加载 URL，并解析响应以获取加载结果。
6. private String getBasicAuthHeader(String username, String password): 此方法用于生成基本身份验证头部，以便在 HTTP 请求中进行身份验证。
7. private HttpEntity getHttpEntity(CloseableHttpResponse response): 这是一个实用方法，用于从 HTTP 响应中提取实体内容。
8. private String getLoadHost(): 该方法从配置选项中获取用于加载数据的主机地址列表，并尝试连接到这些主机以检查其可用性。它会返回第一个可用的主机地址。

DorisStreamLoadObserver 类主要用于处理数据加载任务，它负责构建适当的 HTTP 请求，将数据发送到 Doris 数据库，并监控加载任务的状态。通过这些方法，可以实现将数据从外部系统加载到 Doris 数据库中，并在加载过程中进行必要的状态检查和错误处理。

import org.apache.commons.codec.binary.Base64;
import org.apache.http.HttpEntity;
import org.apache.http.HttpHeaders;
import org.apache.http.client.config.RequestConfig;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPut;
import org.apache.http.entity.ByteArrayEntity;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.DefaultRedirectStrategy;
import org.apache.http.impl.client.HttpClientBuilder;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.util.EntityUtils;
import org.json.simple.JSONValue;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.io.IOException;
import java.net.HttpURLConnection;
import java.net.URL;
import java.nio.ByteBuffer;
import java.nio.charset.StandardCharsets;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.concurrent.TimeUnit;
import java.util.stream.Collectors;public class DorisStreamLoadObserver {private static final Logger LOG = LoggerFactory.getLogger(DorisStreamLoadObserver.class);private Keys options;private long pos;private static final String RESULT_FAILED = "Fail";private static final String RESULT_LABEL_EXISTED = "Label Already Exists";private static final String LAEBL_STATE_VISIBLE = "VISIBLE";private static final String LAEBL_STATE_COMMITTED = "COMMITTED";private static final String RESULT_LABEL_PREPARE = "PREPARE";private static final String RESULT_LABEL_ABORTED = "ABORTED";private static final String RESULT_LABEL_UNKNOWN = "UNKNOWN";public DorisStreamLoadObserver(Keys options) {this.options = options;}// 数据写入 Doris 的主要方法public void streamLoad(WriterTuple data) throws Exception {String host = getLoadHost();if (host == null) {throw new IOException("load_url cannot be empty, or the host cannot connect. Please check your configuration.");}String loadUrl = new StringBuilder(host).append("/api/").append(options.getDatabase()).append("/").append(options.getTable()).append("/_stream_load").toString();LOG.info("Start to join batch data: rows[{}] bytes[{}] label[{}].", data.getRows().size(), data.getBytes(), data.getLabel());Map<String, Object> loadResult = put(loadUrl, data.getLabel(), addRows(data.getRows(), data.getBytes().intValue()));LOG.info("StreamLoad response :{}", JSONValue.toJSONString(loadResult));final String keyStatus = "Status";if (null == loadResult || !loadResult.containsKey(keyStatus)) {throw new IOException("Unable to flush data to Doris: unknown result status.");}LOG.debug("StreamLoad response:{}", JSONValue.toJSONString(loadResult));if (RESULT_FAILED.equals(loadResult.get(keyStatus))) {throw new IOException(new StringBuilder("Failed to flush data to Doris.\n").append(JSONValue.toJSONString(loadResult)).toString());} else if (RESULT_LABEL_EXISTED.equals(loadResult.get(keyStatus))) {LOG.debug("StreamLoad response:{}", JSONValue.toJSONString(loadResult));checkStreamLoadState(host, data.getLabel());}}// 检查数据加载状态的方法private void checkStreamLoadState(String host, String label) throws IOException {int idx = 0;while (true) {try {TimeUnit.SECONDS.sleep(Math.min(++idx, 5));} catch (InterruptedException ex) {break;}try (CloseableHttpClient httpclient = HttpClients.createDefault()) {HttpGet httpGet = new HttpGet(new StringBuilder(host).append("/api/").append(options.getDatabase()).append("/get_load_state?label=").append(label).toString());httpGet.setHeader("Authorization", getBasicAuthHeader(options.getUsername(), options.getPassword()));httpGet.setHeader("Connection", "close");try (CloseableHttpResponse resp = httpclient.execute(httpGet)) {HttpEntity respEntity = getHttpEntity(resp);if (respEntity == null) {throw new IOException(String.format("Failed to flush data to Doris, Error " +"could not get the final state of label[%s].\n", label), null);}Map<String, Object> result = (Map<String, Object>) JSONValue.parse(EntityUtils.toString(respEntity));String labelState = (String) result.get("state");if (null == labelState) {throw new IOException(String.format("Failed to flush data to Doris, Error " +"could not get the final state of label[%s]. response[%s]\n", label, EntityUtils.toString(respEntity)), null);}LOG.info(String.format("Checking label[%s] state[%s]\n", label, labelState));switch (labelState) {case LAEBL_STATE_VISIBLE:case LAEBL_STATE_COMMITTED:return;case RESULT_LABEL_PREPARE:continue;case RESULT_LABEL_ABORTED:throw new DorisWriterExcetion(String.format("Failed to flush data to Doris, Error " +"label[%s] state[%s]\n", label, labelState), null, true);case RESULT_LABEL_UNKNOWN:default:throw new IOException(String.format("Failed to flush data to Doris, Error " +"label[%s] state[%s]\n", label, labelState), null);}}}}}// 根据格式将数据行拼接成字节数组private byte[] addRows(List<byte[]> rows, int totalBytes) {if (Keys.StreamLoadFormat.CSV.equals(options.getStreamLoadFormat())) {Map<String, Object> props = (options.getLoadProps() == null ? new HashMap<>() : options.getLoadProps());byte[] lineDelimiter = DelimiterParser.parse((String) props.get("line_delimiter"), "\n").getBytes(StandardCharsets.UTF_8);ByteBuffer bos = ByteBuffer.allocate(totalBytes + rows.size() * lineDelimiter.length);for (byte[] row : rows) {bos.put(row);bos.put(lineDelimiter);}return bos.array();}if (Keys.StreamLoadFormat.JSON.equals(options.getStreamLoadFormat())) {ByteBuffer bos = ByteBuffer.allocate(totalBytes + (rows.isEmpty() ? 2 : rows.size() + 1));bos.put("[".getBytes(StandardCharsets.UTF_8));byte[] jsonDelimiter = ",".getBytes(StandardCharsets.UTF_8);boolean isFirstElement = true;for (byte[] row : rows) {if (!isFirstElement) {bos.put(jsonDelimiter);}bos.put(row);isFirstElement = false;}bos.put("]".getBytes(StandardCharsets.UTF_8));return bos.array();}throw new RuntimeException("Failed to join rows data, unsupported `format` from stream load properties:");}private Map<String, Object> put(String loadUrl, String label, byte[] data) throws IOException {RequestConfig requestConfig = RequestConfig.custom().setSocketTimeout(120 * 1000).setConnectTimeout(120 * 1000).setConnectionRequestTimeout(120 * 1000).build();try (CloseableHttpClient httpclient = HttpClientBuilder.create().setDefaultRequestConfig(requestConfig).setRedirectStrategy(new DefaultRedirectStrategy()).build()) {HttpPut httpPut = new HttpPut(loadUrl);httpPut.setHeader(HttpHeaders.CONTENT_TYPE, "application/octet-stream");httpPut.setHeader("Authorization", getBasicAuthHeader(options.getUsername(), options.getPassword()));httpPut.setEntity(new ByteArrayEntity(data));try (CloseableHttpResponse resp = httpclient.execute(httpPut)) {HttpEntity respEntity = getHttpEntity(resp);if (respEntity == null) {throw new IOException("Failed to flush data to Doris, Error could not get the response entity.");}return (Map<String, Object>) JSONValue.parse(EntityUtils.toString(respEntity));}}}// 构造 HTTP 请求中的基本认证头部private String getBasicAuthHeader(String username, String password) {String credentials = username + ":" + password;byte[] credentialsBytes = credentials.getBytes(StandardCharsets.UTF_8);String base64Credentials = Base64.encodeBase64String(credentialsBytes);return "Basic " + base64Credentials;}// 从 HTTP 响应中获取实体内容private HttpEntity getHttpEntity(CloseableHttpResponse response) {if (response != null) {return response.getEntity();}return null;}// 获取用于加载数据的主机地址private String getLoadHost() {List<String> hosts = options.getDorisStreamLoadUrls();for (String host : hosts) {try {HttpURLConnection connection = (HttpURLConnection) new URL(host).openConnection();connection.setRequestMethod("HEAD");int responseCode = connection.getResponseCode();if (responseCode == HttpURLConnection.HTTP_OK) {return host;}} catch (IOException e) {LOG.warn("Failed to connect to host: {}", host);}}return null;}
}