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package com.clickhouse.client.api.internal;
import com.clickhouse.client.ClickHouseNode;
import com.clickhouse.client.ClickHouseSslContextProvider;
import com.clickhouse.client.api.Client;
import com.clickhouse.client.api.ClientException;
import com.clickhouse.client.api.ClientFaultCause;
import com.clickhouse.client.api.ClientMisconfigurationException;
import com.clickhouse.client.api.ClientSettings;
import com.clickhouse.client.api.ConnectionInitiationException;
import com.clickhouse.client.api.ConnectionReuseStrategy;
import com.clickhouse.client.api.ServerException;
import com.clickhouse.client.api.enums.ProxyType;
import com.clickhouse.client.config.ClickHouseClientOption;
import com.clickhouse.client.config.ClickHouseDefaults;
import com.clickhouse.client.http.ClickHouseHttpProto;
import com.clickhouse.client.http.config.ClickHouseHttpOption;
import org.apache.hc.client5.http.ConnectTimeoutException;
import org.apache.hc.client5.http.classic.methods.HttpPost;
import org.apache.hc.client5.http.config.ConnectionConfig;
import org.apache.hc.client5.http.config.RequestConfig;
import org.apache.hc.client5.http.impl.classic.CloseableHttpClient;
import org.apache.hc.client5.http.impl.classic.HttpClientBuilder;
import org.apache.hc.client5.http.impl.io.BasicHttpClientConnectionManager;
import org.apache.hc.client5.http.impl.io.ManagedHttpClientConnectionFactory;
import org.apache.hc.client5.http.impl.io.PoolingHttpClientConnectionManagerBuilder;
import org.apache.hc.client5.http.io.HttpClientConnectionManager;
import org.apache.hc.client5.http.protocol.HttpClientContext;
import org.apache.hc.client5.http.socket.ConnectionSocketFactory;
import org.apache.hc.client5.http.socket.PlainConnectionSocketFactory;
import org.apache.hc.client5.http.ssl.SSLConnectionSocketFactory;
import org.apache.hc.core5.http.ClassicHttpResponse;
import org.apache.hc.core5.http.ConnectionRequestTimeoutException;
import org.apache.hc.core5.http.ContentType;
import org.apache.hc.core5.http.Header;
import org.apache.hc.core5.http.HttpEntity;
import org.apache.hc.core5.http.HttpHeaders;
import org.apache.hc.core5.http.HttpHost;
import org.apache.hc.core5.http.HttpStatus;
import org.apache.hc.core5.http.NoHttpResponseException;
import org.apache.hc.core5.http.config.CharCodingConfig;
import org.apache.hc.core5.http.config.Http1Config;
import org.apache.hc.core5.http.config.RegistryBuilder;
import org.apache.hc.core5.http.impl.io.DefaultHttpResponseParserFactory;
import org.apache.hc.core5.http.io.SocketConfig;
import org.apache.hc.core5.http.io.entity.EntityTemplate;
import org.apache.hc.core5.io.IOCallback;
import org.apache.hc.core5.net.URIBuilder;
import org.apache.hc.core5.pool.PoolConcurrencyPolicy;
import org.apache.hc.core5.pool.PoolReusePolicy;
import org.apache.hc.core5.util.TimeValue;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import javax.net.ssl.SSLContext;
import javax.net.ssl.SSLException;
import java.io.BufferedReader;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.net.ConnectException;
import java.net.InetSocketAddress;
import java.net.NoRouteToHostException;
import java.net.URI;
import java.net.URISyntaxException;
import java.net.UnknownHostException;
import java.nio.ByteBuffer;
import java.nio.charset.StandardCharsets;
import java.security.NoSuchAlgorithmException;
import java.util.Base64;
import java.util.EnumSet;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
import java.util.StringTokenizer;
import java.util.concurrent.TimeUnit;
import java.util.function.Function;
public class HttpAPIClientHelper {
private static final Logger LOG = LoggerFactory.getLogger(Client.class);
private static int ERROR_BODY_BUFFER_SIZE = 1024; // Error messages are usually small
private CloseableHttpClient httpClient;
private Map chConfiguration;
private RequestConfig baseRequestConfig;
private String proxyAuthHeaderValue;
private final Set defaultRetryCauses;
public HttpAPIClientHelper(Map configuration) {
this.chConfiguration = configuration;
this.httpClient = createHttpClient();
RequestConfig.Builder reqConfBuilder = RequestConfig.custom();
MapUtils.applyLong(chConfiguration, "connection_request_timeout",
(t) -> reqConfBuilder
.setConnectionRequestTimeout(t, TimeUnit.MILLISECONDS));
this.baseRequestConfig = reqConfBuilder.build();
boolean usingClientCompression= chConfiguration.getOrDefault(ClickHouseClientOption.DECOMPRESS.getKey(), "false").equalsIgnoreCase("true");
boolean usingServerCompression= chConfiguration.getOrDefault(ClickHouseClientOption.COMPRESS.getKey(), "false").equalsIgnoreCase("true");
boolean useHttpCompression = chConfiguration.getOrDefault("client.use_http_compression", "false").equalsIgnoreCase("true");
LOG.info("client compression: {}, server compression: {}, http compression: {}", usingClientCompression, usingServerCompression, useHttpCompression);
defaultRetryCauses = SerializerUtils.parseEnumList(chConfiguration.get("client_retry_on_failures"), ClientFaultCause.class);
if (defaultRetryCauses.contains(ClientFaultCause.None)) {
defaultRetryCauses.removeIf(c -> c != ClientFaultCause.None);
}
}
/**
* Creates or returns default SSL context.
* @return SSLContext
*/
public SSLContext createSSLContext() {
SSLContext sslContext;
try {
sslContext = SSLContext.getDefault();
} catch (NoSuchAlgorithmException e) {
throw new ClientException("Failed to create default SSL context", e);
}
ClickHouseSslContextProvider sslContextProvider = ClickHouseSslContextProvider.getProvider();
String trustStorePath = chConfiguration.get(ClickHouseClientOption.TRUST_STORE.getKey());
if (trustStorePath != null ) {
try {
sslContext = sslContextProvider.getSslContextFromKeyStore(
trustStorePath,
chConfiguration.get(ClickHouseClientOption.KEY_STORE_PASSWORD.getKey()),
chConfiguration.get(ClickHouseClientOption.KEY_STORE_TYPE.getKey())
);
} catch (SSLException e) {
throw new ClientMisconfigurationException("Failed to create SSL context from a keystore", e);
}
} else if (chConfiguration.get(ClickHouseClientOption.SSL_ROOT_CERTIFICATE.getKey()) != null ||
chConfiguration.get(ClickHouseClientOption.SSL_CERTIFICATE.getKey()) != null ||
chConfiguration.get(ClickHouseClientOption.SSL_KEY.getKey()) != null) {
try {
sslContext = sslContextProvider.getSslContextFromCerts(
chConfiguration.get(ClickHouseClientOption.SSL_CERTIFICATE.getKey()),
chConfiguration.get(ClickHouseClientOption.SSL_KEY.getKey()),
chConfiguration.get(ClickHouseClientOption.SSL_ROOT_CERTIFICATE.getKey())
);
} catch (SSLException e) {
throw new ClientMisconfigurationException("Failed to create SSL context from certificates", e);
}
}
return sslContext;
}
private long CONNECTION_INACTIVITY_CHECK = 5000L;
private ConnectionConfig createConnectionConfig() {
ConnectionConfig.Builder connConfig = ConnectionConfig.custom();
connConfig.setTimeToLive(MapUtils.getLong(chConfiguration, ClickHouseClientOption.CONNECTION_TTL.getKey()),
TimeUnit.MILLISECONDS);
connConfig.setConnectTimeout(MapUtils.getLong(chConfiguration, ClickHouseClientOption.CONNECTION_TIMEOUT.getKey()),
TimeUnit.MILLISECONDS);
connConfig.setValidateAfterInactivity(CONNECTION_INACTIVITY_CHECK, TimeUnit.MILLISECONDS); // non-configurable for now
return connConfig.build();
}
private HttpClientConnectionManager basicConnectionManager(SSLContext sslContext, SocketConfig socketConfig) {
RegistryBuilder registryBuilder = RegistryBuilder.create();
registryBuilder.register("http", PlainConnectionSocketFactory.getSocketFactory());
registryBuilder.register("https", new SSLConnectionSocketFactory(sslContext));
BasicHttpClientConnectionManager connManager = new BasicHttpClientConnectionManager(registryBuilder.build());
connManager.setConnectionConfig(createConnectionConfig());
connManager.setSocketConfig(socketConfig);
return connManager;
}
private HttpClientConnectionManager poolConnectionManager(SSLContext sslContext, SocketConfig socketConfig) {
PoolingHttpClientConnectionManagerBuilder connMgrBuilder = PoolingHttpClientConnectionManagerBuilder.create()
.setPoolConcurrencyPolicy(PoolConcurrencyPolicy.LAX);
ConnectionReuseStrategy connectionReuseStrategy =
ConnectionReuseStrategy.valueOf(chConfiguration.get("connection_reuse_strategy"));
switch (connectionReuseStrategy) {
case LIFO:
connMgrBuilder.setConnPoolPolicy(PoolReusePolicy.LIFO);
break;
case FIFO:
connMgrBuilder.setConnPoolPolicy(PoolReusePolicy.FIFO);
break;
default:
throw new ClientMisconfigurationException("Unknown connection reuse strategy: " + connectionReuseStrategy);
}
LOG.info("Connection reuse strategy: {}", connectionReuseStrategy);
connMgrBuilder.setDefaultConnectionConfig(createConnectionConfig());
connMgrBuilder.setMaxConnTotal(Integer.MAX_VALUE); // as we do not know how many routes we will have
MapUtils.applyInt(chConfiguration, ClickHouseHttpOption.MAX_OPEN_CONNECTIONS.getKey(),
connMgrBuilder::setMaxConnPerRoute);
int networkBufferSize = MapUtils.getInt(chConfiguration, "client_network_buffer_size");
ManagedHttpClientConnectionFactory connectionFactory = new ManagedHttpClientConnectionFactory(
Http1Config.custom()
.setBufferSize(networkBufferSize)
.build(),
CharCodingConfig.DEFAULT,
DefaultHttpResponseParserFactory.INSTANCE);
connMgrBuilder.setConnectionFactory(connectionFactory);
connMgrBuilder.setSSLSocketFactory(new SSLConnectionSocketFactory(sslContext));
connMgrBuilder.setDefaultSocketConfig(socketConfig);
return connMgrBuilder.build();
}
public CloseableHttpClient createHttpClient() {
// Top Level builders
HttpClientBuilder clientBuilder = HttpClientBuilder.create();
SSLContext sslContext = createSSLContext();
// Socket configuration
SocketConfig.Builder soCfgBuilder = SocketConfig.custom();
MapUtils.applyInt(chConfiguration, ClickHouseClientOption.SOCKET_TIMEOUT.getKey(),
(t) -> soCfgBuilder.setSoTimeout(t, TimeUnit.MILLISECONDS));
MapUtils.applyInt(chConfiguration, ClickHouseClientOption.SOCKET_RCVBUF.getKey(),
soCfgBuilder::setRcvBufSize);
MapUtils.applyInt(chConfiguration, ClickHouseClientOption.SOCKET_SNDBUF.getKey(),
soCfgBuilder::setSndBufSize);
MapUtils.applyInt(chConfiguration, ClickHouseClientOption.SOCKET_LINGER.getKey(),
(v) -> soCfgBuilder.setSoLinger(v, TimeUnit.SECONDS));
// Proxy
String proxyHost = chConfiguration.get(ClickHouseClientOption.PROXY_HOST.getKey());
String proxyPort = chConfiguration.get(ClickHouseClientOption.PROXY_PORT.getKey());
HttpHost proxy = null;
if (proxyHost != null && proxyPort != null) {
proxy = new HttpHost(proxyHost, Integer.parseInt(proxyPort));
}
String proxyTypeVal = chConfiguration.get(ClickHouseClientOption.PROXY_TYPE.getKey());
ProxyType proxyType = proxyTypeVal == null ? null : ProxyType.valueOf(proxyTypeVal);
if (proxyType == ProxyType.HTTP) {
clientBuilder.setProxy(proxy);
if (chConfiguration.containsKey("proxy_password") && chConfiguration.containsKey("proxy_user")) {
proxyAuthHeaderValue = "Basic " + Base64.getEncoder().encodeToString(
(chConfiguration.get("proxy_user") + ":" + chConfiguration.get("proxy_password")).getBytes());
}
} else if (proxyType == ProxyType.SOCKS) {
soCfgBuilder.setSocksProxyAddress(new InetSocketAddress(proxyHost, Integer.parseInt(proxyPort)));
}
if (chConfiguration.getOrDefault("client.http.cookies_enabled", "true")
.equalsIgnoreCase("false")) {
clientBuilder.disableCookieManagement();
}
SocketConfig socketConfig = soCfgBuilder.build();
// Connection manager
boolean isConnectionPooling = MapUtils.getFlag(chConfiguration, "connection_pool_enabled");
if (isConnectionPooling) {
clientBuilder.setConnectionManager(poolConnectionManager(sslContext, socketConfig));
} else {
clientBuilder.setConnectionManager(basicConnectionManager(sslContext, socketConfig));
}
long keepAliveTimeout = MapUtils.getLong(chConfiguration, ClickHouseHttpOption.KEEP_ALIVE_TIMEOUT.getKey());
if (keepAliveTimeout > 0) {
clientBuilder.setKeepAliveStrategy((response, context) -> TimeValue.ofMilliseconds(keepAliveTimeout));
}
return clientBuilder.build();
}
private static final String ERROR_CODE_PREFIX_PATTERN = "Code: %d. DB::Exception:";
/**
* Reads status line and if error tries to parse response body to get server error message.
*
* @param httpResponse - HTTP response
* @return
*/
public Exception readError(ClassicHttpResponse httpResponse) {
int serverCode = getHeaderInt(httpResponse.getFirstHeader(ClickHouseHttpProto.HEADER_EXCEPTION_CODE), 0);
try (InputStream body = httpResponse.getEntity().getContent()) {
byte [] buffer = new byte[ERROR_BODY_BUFFER_SIZE];
byte [] lookUpStr = String.format(ERROR_CODE_PREFIX_PATTERN, serverCode).getBytes(StandardCharsets.UTF_8);
while (true) {
int rBytes = body.read(buffer);
if (rBytes == -1) {
break;
} else {
for (int i = 0; i < rBytes; i++) {
if (buffer[i] == lookUpStr[0]) {
boolean found = true;
for (int j = 1; j < Math.min(rBytes - i, lookUpStr.length); j++) {
if (buffer[i + j] != lookUpStr[j]) {
found = false;
break;
}
}
if (found) {
int start = i;
while (i < rBytes && buffer[i] != '\n') {
i++;
}
return new ServerException(serverCode, new String(buffer, start, i -start, StandardCharsets.UTF_8));
}
}
}
}
}
return new ServerException(serverCode, String.format(ERROR_CODE_PREFIX_PATTERN, serverCode) + " ");
} catch (IOException e) {
throw new ClientException("Failed to read response body", e);
}
}
public ClassicHttpResponse executeRequest(ClickHouseNode server, Map requestConfig,
IOCallback writeCallback) throws IOException {
URI uri;
try {
URIBuilder uriBuilder = new URIBuilder(server.getBaseUri());
addQueryParams(uriBuilder, chConfiguration, requestConfig);
uri = uriBuilder.normalizeSyntax().build();
} catch (URISyntaxException e) {
throw new RuntimeException(e);
}
HttpPost req = new HttpPost(uri);
// req.setVersion(new ProtocolVersion("HTTP", 1, 0)); // to disable chunk transfer encoding
addHeaders(req, chConfiguration, requestConfig);
RequestConfig httpReqConfig = RequestConfig.copy(baseRequestConfig)
.build();
req.setConfig(httpReqConfig);
// setting entity. wrapping if compression is enabled
req.setEntity(wrapEntity(new EntityTemplate(-1, CONTENT_TYPE, null, writeCallback), false));
HttpClientContext context = HttpClientContext.create();
try {
ClassicHttpResponse httpResponse = httpClient.executeOpen(null, req, context);
httpResponse.setEntity(wrapEntity(httpResponse.getEntity(), true));
if (httpResponse.getCode() == HttpStatus.SC_PROXY_AUTHENTICATION_REQUIRED) {
throw new ClientMisconfigurationException("Proxy authentication required. Please check your proxy settings.");
} else if (httpResponse.getCode() >= HttpStatus.SC_BAD_REQUEST &&
httpResponse.getCode() < HttpStatus.SC_SERVER_ERROR) {
try {
throw readError(httpResponse);
} finally {
httpResponse.close();
}
} else if (httpResponse.getCode() == HttpStatus.SC_BAD_GATEWAY) {
httpResponse.close();
throw new ClientException("Server returned '502 Bad gateway'. Check network and proxy settings.");
} else if (httpResponse.getCode() >= HttpStatus.SC_INTERNAL_SERVER_ERROR) {
httpResponse.close();
return httpResponse;
}
return httpResponse;
} catch (UnknownHostException e) {
LOG.warn("Host '{}' unknown", server.getHost());
throw new ClientException("Unknown host", e);
} catch (ConnectException | NoRouteToHostException e) {
LOG.warn("Failed to connect to '{}': {}", server.getHost(), e.getMessage());
throw new ClientException("Failed to connect", e);
} catch (ConnectionRequestTimeoutException | ServerException | NoHttpResponseException | ClientException e) {
throw e;
} catch (Exception e) {
throw new ClientException("Failed to execute request", e);
}
}
private static final ContentType CONTENT_TYPE = ContentType.create(ContentType.TEXT_PLAIN.getMimeType(), "UTF-8");
private void addHeaders(HttpPost req, Map chConfig, Map requestConfig) {
req.addHeader(HttpHeaders.CONTENT_TYPE, CONTENT_TYPE.getMimeType());
if (requestConfig != null) {
if (requestConfig.containsKey(ClickHouseClientOption.FORMAT.getKey())) {
req.addHeader(ClickHouseHttpProto.HEADER_FORMAT, requestConfig.get(ClickHouseClientOption.FORMAT.getKey()));
}
if (requestConfig.containsKey(ClickHouseClientOption.QUERY_ID.getKey())) {
req.addHeader(ClickHouseHttpProto.HEADER_QUERY_ID, requestConfig.get(ClickHouseClientOption.QUERY_ID.getKey()).toString());
}
}
req.addHeader(ClickHouseHttpProto.HEADER_DATABASE, chConfig.get(ClickHouseClientOption.DATABASE.getKey()));
req.addHeader(ClickHouseHttpProto.HEADER_DB_USER, chConfig.get(ClickHouseDefaults.USER.getKey()));
req.addHeader(ClickHouseHttpProto.HEADER_DB_PASSWORD, chConfig.get(ClickHouseDefaults.PASSWORD.getKey()));
if (proxyAuthHeaderValue != null) {
req.addHeader(HttpHeaders.PROXY_AUTHORIZATION, proxyAuthHeaderValue);
}
boolean serverCompression = chConfiguration.getOrDefault(ClickHouseClientOption.COMPRESS.getKey(), "false").equalsIgnoreCase("true");
boolean clientCompression = chConfiguration.getOrDefault(ClickHouseClientOption.DECOMPRESS.getKey(), "false").equalsIgnoreCase("true");
boolean useHttpCompression = chConfiguration.getOrDefault("client.use_http_compression", "false").equalsIgnoreCase("true");
if (useHttpCompression) {
if (serverCompression) {
req.addHeader(HttpHeaders.ACCEPT_ENCODING, "lz4");
}
if (clientCompression) {
req.addHeader(HttpHeaders.CONTENT_ENCODING, "lz4");
}
}
for (Map.Entry entry : chConfig.entrySet()) {
if (entry.getKey().startsWith(ClientSettings.HTTP_HEADER_PREFIX)) {
req.addHeader(entry.getKey().substring(ClientSettings.HTTP_HEADER_PREFIX.length()), entry.getValue());
}
}
for (Map.Entry entry : requestConfig.entrySet()) {
if (entry.getKey().startsWith(ClientSettings.HTTP_HEADER_PREFIX)) {
req.addHeader(entry.getKey().substring(ClientSettings.HTTP_HEADER_PREFIX.length()), entry.getValue().toString());
}
}
}
private void addQueryParams(URIBuilder req, Map chConfig, Map requestConfig) {
for (Map.Entry entry : chConfig.entrySet()) {
if (entry.getKey().startsWith(ClientSettings.SERVER_SETTING_PREFIX)) {
req.addParameter(entry.getKey().substring(ClientSettings.SERVER_SETTING_PREFIX.length()), entry.getValue());
}
}
if (requestConfig != null) {
if (requestConfig.containsKey(ClickHouseHttpOption.WAIT_END_OF_QUERY.getKey())) {
req.addParameter(ClickHouseHttpOption.WAIT_END_OF_QUERY.getKey(),
requestConfig.get(ClickHouseHttpOption.WAIT_END_OF_QUERY.getKey()).toString());
}
if (requestConfig.containsKey(ClickHouseClientOption.QUERY_ID.getKey())) {
req.addParameter(ClickHouseHttpProto.QPARAM_QUERY_ID, requestConfig.get(ClickHouseClientOption.QUERY_ID.getKey()).toString());
}
if (requestConfig.containsKey("statement_params")) {
Map params = (Map) requestConfig.get("statement_params");
for (Map.Entry entry : params.entrySet()) {
req.addParameter("param_" + entry.getKey(), String.valueOf(entry.getValue()));
}
}
}
boolean serverCompression = chConfiguration.getOrDefault(ClickHouseClientOption.COMPRESS.getKey(), "false").equalsIgnoreCase("true");
boolean clientCompression = chConfiguration.getOrDefault(ClickHouseClientOption.DECOMPRESS.getKey(), "false").equalsIgnoreCase("true");
boolean useHttpCompression = chConfiguration.getOrDefault("client.use_http_compression", "false").equalsIgnoreCase("true");
if (useHttpCompression) {
// enable_http_compression make server react on http header
// for client side compression Content-Encoding should be set
// for server side compression Accept-Encoding should be set
req.addParameter("enable_http_compression", "1");
} else {
if (serverCompression) {
req.addParameter("compress", "1");
}
if (clientCompression) {
req.addParameter("decompress", "1");
}
}
if (requestConfig != null) {
for (Map.Entry entry : requestConfig.entrySet()) {
if (entry.getKey().startsWith(ClientSettings.SERVER_SETTING_PREFIX)) {
req.addParameter(entry.getKey().substring(ClientSettings.SERVER_SETTING_PREFIX.length()), entry.getValue().toString());
}
}
}
}
private HttpEntity wrapEntity(HttpEntity httpEntity, boolean isResponse) {
boolean serverCompression = chConfiguration.getOrDefault(ClickHouseClientOption.COMPRESS.getKey(), "false").equalsIgnoreCase("true");
boolean clientCompression = chConfiguration.getOrDefault(ClickHouseClientOption.DECOMPRESS.getKey(), "false").equalsIgnoreCase("true");
boolean useHttpCompression = chConfiguration.getOrDefault("client.use_http_compression", "false").equalsIgnoreCase("true");
if (serverCompression || clientCompression) {
return new LZ4Entity(httpEntity, useHttpCompression, serverCompression, clientCompression,
MapUtils.getInt(chConfiguration, "compression.lz4.uncompressed_buffer_size"), isResponse);
} else {
return httpEntity;
}
}
public static int getHeaderInt(Header header, int defaultValue) {
return getHeaderVal(header, defaultValue, Integer::parseInt);
}
public static String getHeaderVal(Header header, String defaultValue) {
return getHeaderVal(header, defaultValue, Function.identity());
}
public static T getHeaderVal(Header header, T defaultValue, Function converter) {
if (header == null) {
return defaultValue;
}
return converter.apply(header.getValue());
}
public boolean shouldRetry(Exception ex, Map requestSettings) {
Set retryCauses = (Set)
requestSettings.getOrDefault("retry_on_failures", defaultRetryCauses);
if (retryCauses.contains(ClientFaultCause.None)) {
return false;
}
if (ex instanceof NoHttpResponseException ) {
return retryCauses.contains(ClientFaultCause.NoHttpResponse);
}
if (ex instanceof ConnectException) {
return retryCauses.contains(ClientFaultCause.ConnectTimeout);
}
if (ex instanceof ConnectionRequestTimeoutException) {
return retryCauses.contains(ClientFaultCause.ConnectionRequestTimeout);
}
return false;
}
// This method wraps some client specific exceptions into specific ClientException or just ClientException
// ClientException will be also wrapped
public ClientException wrapException(String message, Exception cause) {
if (cause instanceof ConnectionRequestTimeoutException ||
cause instanceof ConnectTimeoutException ||
cause instanceof ConnectException) {
return new ConnectionInitiationException(message, cause);
}
return new ClientException(message, cause);
}
}