/
DefaultStorageRetryStrategy.java
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/
DefaultStorageRetryStrategy.java
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/*
* Copyright 2021 Google LLC
*
* Licensed 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 com.google.cloud.storage;
import com.fasterxml.jackson.core.io.JsonEOFException;
import com.google.api.client.http.HttpResponseException;
import com.google.cloud.BaseServiceException;
import com.google.cloud.ExceptionHandler;
import com.google.cloud.ExceptionHandler.Interceptor;
import com.google.common.collect.ImmutableSet;
import com.google.gson.stream.MalformedJsonException;
import java.io.IOException;
import java.util.Set;
final class DefaultStorageRetryStrategy implements StorageRetryStrategy {
private static final long serialVersionUID = -6145057244885961913L;
private static final Interceptor INTERCEPTOR_IDEMPOTENT =
new InterceptorImpl(true, StorageException.RETRYABLE_ERRORS);
private static final Interceptor INTERCEPTOR_NON_IDEMPOTENT =
new InterceptorImpl(false, ImmutableSet.of());
private static final ExceptionHandler IDEMPOTENT_HANDLER =
newHandler(new EmptyJsonParsingExceptionInterceptor(), INTERCEPTOR_IDEMPOTENT);
private static final ExceptionHandler NON_IDEMPOTENT_HANDLER =
newHandler(INTERCEPTOR_NON_IDEMPOTENT);
@Override
public ExceptionHandler getIdempotentHandler() {
return IDEMPOTENT_HANDLER;
}
@Override
public ExceptionHandler getNonidempotentHandler() {
return NON_IDEMPOTENT_HANDLER;
}
private static ExceptionHandler newHandler(Interceptor... interceptors) {
return ExceptionHandler.newBuilder().addInterceptors(interceptors).build();
}
private static class InterceptorImpl implements BaseInterceptor {
private static final long serialVersionUID = -5153236691367895096L;
private final boolean idempotent;
private final ImmutableSet<BaseServiceException.Error> retryableErrors;
private InterceptorImpl(boolean idempotent, Set<BaseServiceException.Error> retryableErrors) {
this.idempotent = idempotent;
this.retryableErrors = ImmutableSet.copyOf(retryableErrors);
}
@Override
public RetryResult beforeEval(Exception exception) {
if (exception instanceof BaseServiceException) {
BaseServiceException baseServiceException = (BaseServiceException) exception;
return deepShouldRetry(baseServiceException);
} else if (exception instanceof HttpResponseException) {
int code = ((HttpResponseException) exception).getStatusCode();
return shouldRetryCodeReason(code, null);
} else if (exception instanceof IOException) {
IOException ioException = (IOException) exception;
return shouldRetryIOException(ioException);
}
return RetryResult.CONTINUE_EVALUATION;
}
private RetryResult shouldRetryCodeReason(Integer code, String reason) {
if (BaseServiceException.isRetryable(code, reason, idempotent, retryableErrors)) {
return RetryResult.RETRY;
} else {
return RetryResult.NO_RETRY;
}
}
private RetryResult shouldRetryIOException(IOException ioException) {
if (ioException instanceof JsonEOFException && idempotent) { // Jackson
return RetryResult.RETRY;
} else if (ioException instanceof MalformedJsonException && idempotent) { // Gson
return RetryResult.RETRY;
} else if (BaseServiceException.isRetryable(idempotent, ioException)) {
return RetryResult.RETRY;
} else {
return RetryResult.NO_RETRY;
}
}
private RetryResult deepShouldRetry(BaseServiceException baseServiceException) {
if (baseServiceException.getCode() == BaseServiceException.UNKNOWN_CODE
&& baseServiceException.getReason() == null) {
final Throwable cause = baseServiceException.getCause();
if (cause instanceof IOException) {
IOException ioException = (IOException) cause;
return shouldRetryIOException(ioException);
}
}
int code = baseServiceException.getCode();
String reason = baseServiceException.getReason();
return shouldRetryCodeReason(code, reason);
}
}
private static final class EmptyJsonParsingExceptionInterceptor implements BaseInterceptor {
private static final long serialVersionUID = -3320984020388043628L;
@Override
public RetryResult beforeEval(Exception exception) {
if (exception instanceof IllegalArgumentException) {
IllegalArgumentException illegalArgumentException = (IllegalArgumentException) exception;
if (illegalArgumentException.getMessage().equals("no JSON input found")) {
return RetryResult.RETRY;
}
}
return RetryResult.CONTINUE_EVALUATION;
}
}
private interface BaseInterceptor extends Interceptor {
@Override
default RetryResult afterEval(Exception exception, RetryResult retryResult) {
return RetryResult.CONTINUE_EVALUATION;
}
}
}