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Java idiomatic client for Google Cloud Storage.
/*
* Copyright 2015 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.google.api.client.googleapis.json.GoogleJsonError;
import com.google.api.core.ApiFuture;
import com.google.api.core.InternalApi;
import com.google.api.gax.grpc.GrpcStatusCode;
import com.google.api.gax.rpc.ApiException;
import com.google.api.gax.rpc.ApiExceptions;
import com.google.api.gax.rpc.StatusCode;
import com.google.cloud.BaseServiceException;
import com.google.cloud.RetryHelper.RetryHelperException;
import com.google.cloud.http.BaseHttpServiceException;
import com.google.common.collect.ImmutableSet;
import io.grpc.StatusException;
import io.grpc.StatusRuntimeException;
import java.io.IOException;
import java.util.Set;
import org.checkerframework.checker.nullness.qual.Nullable;
/**
* Storage service exception.
*
* @see Google Cloud
* Storage error codes
*/
@InternalApi
public final class StorageException extends BaseHttpServiceException {
private static final String INTERNAL_ERROR = "internalError";
private static final String CONNECTION_CLOSED_PREMATURELY = "connectionClosedPrematurely";
// see: https://cloud.google.com/storage/docs/resumable-uploads-xml#practices
static final Set RETRYABLE_ERRORS =
ImmutableSet.of(
new Error(504, null),
new Error(503, null),
new Error(502, null),
new Error(500, null),
new Error(429, null),
new Error(408, null),
new Error(null, INTERNAL_ERROR),
new Error(null, CONNECTION_CLOSED_PREMATURELY));
private static final long serialVersionUID = 757915549325467990L;
final ApiException apiExceptionCause;
public StorageException(int code, String message) {
this(code, message, null);
}
public StorageException(int code, String message, Throwable cause) {
super(code, message, null, true, RETRYABLE_ERRORS, cause);
this.apiExceptionCause = asApiExceptionOrNull(cause);
}
public StorageException(int code, String message, String reason, Throwable cause) {
super(code, message, reason, true, RETRYABLE_ERRORS, cause);
this.apiExceptionCause = asApiExceptionOrNull(cause);
}
public StorageException(IOException exception) {
super(exception, true, RETRYABLE_ERRORS);
this.apiExceptionCause = null;
}
public StorageException(GoogleJsonError error) {
super(error, true, RETRYABLE_ERRORS);
this.apiExceptionCause = null;
}
/**
* Translate RetryHelperException to the StorageException that caused the error. This method will
* always throw an exception.
*
* @throws StorageException when {@code ex} was caused by a {@code StorageException}
*/
public static StorageException translateAndThrow(RetryHelperException ex) {
BaseServiceException.translate(ex);
throw getStorageException(ex);
}
private static StorageException getStorageException(Throwable t) {
// unwrap a RetryHelperException if that is what is being translated
if (t instanceof RetryHelperException) {
return new StorageException(UNKNOWN_CODE, t.getMessage(), t.getCause());
}
return new StorageException(UNKNOWN_CODE, t.getMessage(), t);
}
/**
* Attempt to find an Exception which is a {@link BaseServiceException} If neither {@code t} or
* {@code t.getCause()} are a {@code BaseServiceException} a {@link StorageException} will be
* created with an unknown status code.
*/
static BaseServiceException coalesce(Throwable t) {
if (t instanceof BaseServiceException) {
return (BaseServiceException) t;
}
if (t.getCause() instanceof BaseServiceException) {
return (BaseServiceException) t.getCause();
}
if (t instanceof ApiException) {
return asStorageException((ApiException) t);
}
return getStorageException(t);
}
static StorageException asStorageException(ApiException apiEx) {
// https://cloud.google.com/storage/docs/json_api/v1/status-codes
// https://cloud.google.com/apis/design/errors#http_mapping
// https://cloud.google.com/apis/design/errors#error_payloads
// TODO: flush this out more to wire through "error" and "details" when we're able to get real
// errors from GCS
int httpStatusCode = 0;
StatusCode statusCode = apiEx.getStatusCode();
if (statusCode instanceof GrpcStatusCode) {
GrpcStatusCode gsc = (GrpcStatusCode) statusCode;
httpStatusCode =
GrpcToHttpStatusCodeTranslation.grpcCodeToHttpStatusCode(gsc.getTransportCode());
}
// If there is a gRPC exception in our cause change pull it's error message up to be our
// message otherwise, create a generic error message with the status code.
String statusCodeName = statusCode.getCode().name();
String statusExceptionMessage = getStatusExceptionMessage(apiEx);
String message;
if (statusExceptionMessage != null) {
message = statusCodeName + ": " + statusExceptionMessage;
} else {
message = "Error: " + statusCodeName;
}
// It'd be better to use ExceptionData and BaseServiceException#(ExceptionData) but,
// BaseHttpServiceException does not pass that through so we're stuck using this for now.
// TODO: When we can break the coupling to BaseHttpServiceException replace this
return new StorageException(httpStatusCode, message, apiEx.getReason(), apiEx);
}
/**
* Translate IOException to a StorageException representing the cause of the error. This method
* defaults to idempotent always being {@code true}. Additionally, this method translates
* transient issues Connection Closed Prematurely as a retryable error.
*
* @return {@code StorageException}
*/
public static StorageException translate(IOException exception) {
String message = exception.getMessage();
if (message != null
&& (message.contains("Connection closed prematurely")
|| message.contains("Premature EOF"))) {
return new StorageException(0, message, CONNECTION_CLOSED_PREMATURELY, exception);
} else {
// default
return new StorageException(exception);
}
}
static T wrapIOException(IOExceptionCallable c) {
try {
return c.call();
} catch (IOException e) {
throw StorageException.coalesce(e);
}
}
static void wrapIOException(IOExceptionRunnable r) {
try {
r.run();
} catch (IOException e) {
throw StorageException.coalesce(e);
}
}
static T wrapFutureGet(ApiFuture f) {
try {
return ApiExceptions.callAndTranslateApiException(f);
} catch (Exception e) {
throw StorageException.coalesce(e);
}
}
@Nullable
private static String getStatusExceptionMessage(Exception apiEx) {
if (apiEx.getMessage() != null) {
return apiEx.getMessage();
} else {
Throwable cause = apiEx.getCause();
if (cause instanceof StatusRuntimeException || cause instanceof StatusException) {
return cause.getMessage();
}
return null;
}
}
@Nullable
private static ApiException asApiExceptionOrNull(Throwable cause) {
if (cause instanceof ApiException) {
return (ApiException) cause;
} else {
return null;
}
}
@FunctionalInterface
interface IOExceptionCallable {
T call() throws IOException;
}
@FunctionalInterface
interface IOExceptionRunnable {
void run() throws IOException;
}
}