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org.openqa.selenium.remote.http.RetryRequest Maven / Gradle / Ivy

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// distributed with this work for additional information
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// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License.  You may obtain a copy of the License at
//
//   http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied.  See the License for the
// specific language governing permissions and limitations
// under the License.

package org.openqa.selenium.remote.http;

import org.openqa.selenium.TimeoutException;

import com.google.common.collect.ImmutableMap;

import dev.failsafe.Failsafe;
import dev.failsafe.Fallback;
import dev.failsafe.RetryPolicy;

import java.net.ConnectException;
import java.util.concurrent.atomic.AtomicReference;
import java.util.logging.Logger;

import static com.google.common.net.HttpHeaders.CONTENT_LENGTH;
import static java.net.HttpURLConnection.HTTP_INTERNAL_ERROR;
import static java.net.HttpURLConnection.HTTP_UNAVAILABLE;
import static java.net.HttpURLConnection.HTTP_CLIENT_TIMEOUT;
import static java.net.HttpURLConnection.HTTP_GATEWAY_TIMEOUT;
import static org.openqa.selenium.internal.Debug.getDebugLogLevel;
import static org.openqa.selenium.remote.http.Contents.asJson;

public class RetryRequest implements Filter {

  private static final Logger LOG = Logger.getLogger(RetryRequest.class.getName());
  private static final AtomicReference fallBackResponse = new AtomicReference<>();

  private static final Fallback fallback = Fallback.of(fallBackResponse::get);

  // Retry on connection error.
  private static final RetryPolicy connectionFailurePolicy =
    RetryPolicy.builder()
      .handleIf(failure -> failure.getCause() instanceof ConnectException)
      .withMaxRetries(3)
      .onRetry(e -> LOG.log(
        getDebugLogLevel(),
        "Connection failure #{0}. Retrying.",
        e.getAttemptCount()))
      .onRetriesExceeded(e -> fallBackResponse.set(
        new HttpResponse()
          .setStatus(HTTP_CLIENT_TIMEOUT)
          .setContent(
            asJson(ImmutableMap.of("value", ImmutableMap.of(
              "message", "Connection failure"))))))
      .build();

  // Retry on read timeout.
  private static final RetryPolicy readTimeoutPolicy =
    RetryPolicy.builder()
      .handle(TimeoutException.class)
      .withMaxRetries(3)
      .onRetry(e -> LOG.log(
        getDebugLogLevel(),
        "Read timeout #{0}. Retrying.",
        e.getAttemptCount()))
      .onRetriesExceeded(e -> fallBackResponse.set(
        new HttpResponse()
          .setStatus(HTTP_GATEWAY_TIMEOUT)
          .setContent(
            asJson(ImmutableMap.of("value", ImmutableMap.of(
              "message", "Read timeout"))))))
      .build();

  // Retry if server is unavailable or an internal server error occurs without response body.
  private static final RetryPolicy serverErrorPolicy =
    RetryPolicy.builder()
      .handleResultIf(response -> ((HttpResponse)response).getStatus() == HTTP_INTERNAL_ERROR &&
                                  Integer.parseInt(((HttpResponse)response).getHeader(CONTENT_LENGTH)) == 0)
      .handleResultIf(response -> ((HttpResponse)response).getStatus() == HTTP_UNAVAILABLE)
      .withMaxRetries(2)
      .onRetry(e -> LOG.log(
        getDebugLogLevel(),
        "Failure due to server error #{0}. Retrying.",
        e.getAttemptCount()))
      .onRetriesExceeded(e -> fallBackResponse.set(
        new HttpResponse()
          .setStatus(((HttpResponse)e.getResult()).getStatus())
          .setContent(
            asJson(ImmutableMap.of("value", ImmutableMap.of(
              "message", "Internal server error"))))))
      .build();

  @Override
  public HttpHandler apply(HttpHandler next) {
    return req -> Failsafe
      .with(fallback)
      .compose(serverErrorPolicy)
      .compose(readTimeoutPolicy)
      .compose(connectionFailurePolicy)
      .get(() -> next.execute(req));
  }
}