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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.vespa.athenz.client.common;
import ai.vespa.util.http.hc4.SslConnectionSocketFactory;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.JsonMappingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.datatype.jsr310.JavaTimeModule;
import com.yahoo.vespa.athenz.client.ErrorHandler;
import com.yahoo.vespa.athenz.client.common.bindings.ErrorResponseEntity;
import com.yahoo.vespa.athenz.identity.ServiceIdentitySslSocketFactory;
import org.apache.http.HttpResponse;
import org.apache.http.client.ResponseHandler;
import org.apache.http.client.config.RequestConfig;
import org.apache.http.client.methods.HttpUriRequest;
import org.apache.http.entity.ContentType;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.DefaultHttpRequestRetryHandler;
import org.apache.http.impl.client.HttpClientBuilder;
import org.apache.http.util.EntityUtils;
import javax.net.ssl.HostnameVerifier;
import javax.net.ssl.SSLContext;
import java.io.IOException;
import java.io.UncheckedIOException;
import java.time.Duration;
import java.util.function.Supplier;
import java.util.logging.Level;
import java.util.logging.Logger;
/**
* @author bjorncs
*/
public abstract class ClientBase implements AutoCloseable {
protected final Logger logger = Logger.getLogger(getClass().getName());
private static final ObjectMapper objectMapper = new ObjectMapper().registerModule(new JavaTimeModule());
private final CloseableHttpClient client;
private final ClientExceptionFactory exceptionFactory;
private final ErrorHandler errorHandler;
protected ClientBase(String userAgent,
Supplier<SSLContext> sslContextSupplier,
ClientExceptionFactory exceptionFactory,
HostnameVerifier hostnameVerifier,
ErrorHandler errorHandler) {
this.exceptionFactory = exceptionFactory;
this.errorHandler = errorHandler;
this.client = createHttpClient(userAgent, sslContextSupplier, hostnameVerifier);
}
protected <T> T execute(HttpUriRequest request, ResponseHandler<T> responseHandler) {
try {
return client.execute(request, responseHandler);
} catch (IOException e) {
try {
reportError(request, e);
} catch (Exception _ignored) {}
throw new UncheckedIOException(e);
}
}
private void reportError(HttpUriRequest request, Exception e) {
errorHandler.reportError(() -> request.getURI().getHost(), e);
}
protected StringEntity toJsonStringEntity(Object entity) {
try {
return new StringEntity(objectMapper.writeValueAsString(entity), ContentType.APPLICATION_JSON);
} catch (JsonProcessingException e) {
throw new UncheckedIOException(e);
}
}
protected <T> T readEntity(HttpResponse response, Class<T> entityType) throws IOException {
int statusCode = response.getStatusLine().getStatusCode();
if (isSuccess(statusCode)) {
if (entityType.equals(Void.class)) {
return null;
} else {
return objectMapper.readValue(response.getEntity().getContent(), entityType);
}
} else {
byte[] entity = EntityUtils.toByteArray(response.getEntity());
try {
ErrorResponseEntity errorEntity = objectMapper.readValue(entity, ErrorResponseEntity.class);
throw exceptionFactory.createException(errorEntity.code, errorEntity.description);
} catch (JsonMappingException e) {
logger.log(Level.INFO, String.format("Response returned status %d, but error response not parseable: %s", statusCode, new String(entity)), e);
throw new RuntimeException("Non JSON response from Athenz.");
}
}
}
private boolean isSuccess(int statusCode) {
return statusCode>=200 && statusCode<300;
}
private static CloseableHttpClient createHttpClient(String userAgent, Supplier<SSLContext> sslContextSupplier, HostnameVerifier hostnameVerifier) {
return HttpClientBuilder.create()
.setRetryHandler(new DefaultHttpRequestRetryHandler(3, /*requestSentRetryEnabled*/true))
.setUserAgent(userAgent)
.setSSLSocketFactory(SslConnectionSocketFactory.of(new ServiceIdentitySslSocketFactory(sslContextSupplier), hostnameVerifier))
.setMaxConnPerRoute(8)
.setDefaultRequestConfig(RequestConfig.custom()
.setConnectTimeout((int) Duration.ofSeconds(10).toMillis())
.setConnectionRequestTimeout((int)Duration.ofSeconds(10).toMillis())
.setSocketTimeout((int)Duration.ofSeconds(20).toMillis())
.build())
.build();
}
@Override
public void close() {
try {
this.client.close();
} catch (IOException e) {
throw new UncheckedIOException(e);
}
}
protected interface ClientExceptionFactory {
RuntimeException createException(int errorCode, String description);
}
}
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