问题
I want to delete the folder "test" and everything that is in it.
I am sucessfuly able to delete the folder and all it's contents/subfolders in FirebaseStorage with the terminal using this code:
gsutil rm -r gs://bucketname.appspot.com/test/**
However when I tried to do it in java, it does not work.
Storage storage = StorageOptions.getDefaultInstance().getService();
String bucketName = "bucketname.appspot.com/test";
Bucket bucket = storage.get(bucketName);
bucket.delete(Bucket.BucketSourceOption.metagenerationMatch());
It throws this exception:
Exception in thread "FirebaseDatabaseEventTarget" com.google.cloud.storage.StorageException: Invalid bucket name: 'bucketname.appspot.com/test'
at com.google.cloud.storage.spi.DefaultStorageRpc.translate(DefaultStorageRpc.java:202)
at com.google.cloud.storage.spi.DefaultStorageRpc.get(DefaultStorageRpc.java:322)
at com.google.cloud.storage.StorageImpl$4.call(StorageImpl.java:164)
at com.google.cloud.storage.StorageImpl$4.call(StorageImpl.java:161)
at com.google.cloud.RetryHelper.doRetry(RetryHelper.java:179)
at com.google.cloud.RetryHelper.runWithRetries(RetryHelper.java:244)
at com.google.cloud.storage.StorageImpl.get(StorageImpl.java:160)
at xxx.backend.server_request.GroupRequestManager.deleteGroupStorage(GroupRequestManager.java:119)
at xxx.backend.server_request.GroupRequestManager.deleteGroup(GroupRequestManager.java:26)
at xxx.backend.server_request.ServerRequestListener.onChildAdded(ServerRequestListener.java:27)
at com.google.firebase.database.core.ChildEventRegistration.fireEvent(ChildEventRegistration.java:65)
at com.google.firebase.database.core.view.DataEvent.fire(DataEvent.java:49)
at com.google.firebase.database.core.view.EventRaiser$1.run(EventRaiser.java:41)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
Caused by: com.google.api.client.googleapis.json.GoogleJsonResponseException: 400 Bad Request
{
"code" : 400,
"errors" : [ {
"domain" : "global",
"message" : "Invalid bucket name: 'bucketname.appspot.com/test'",
"reason" : "invalid"
} ],
"message" : "Invalid bucket name: 'bucketname.appspot.com/test'"
}
So then it does not exist? because when I run this code without /test:
Storage storage = StorageOptions.getDefaultInstance().getService();
String bucketName = "bucketname.appspot.com";
Bucket bucket = storage.get(bucketName);
bucket.exists(Bucket.BucketSourceOption.metagenerationMatch());
then exists returns true, no exception and I am able to list all the blobs.. But I want to delete all that is inside "/test".
Edit: Okay, I did get it to work like this, but I need to use a iterator. Is there a better solution? A wildcard or something?
Storage storage = StorageOptions.getDefaultInstance().getService();
String bucketName = "bucketname.appspot.com";
Page<Blob> blobPage = storage.list(bucketName, Storage.BlobListOption.prefix("test/"));
List<BlobId> blobIdList = new LinkedList<>();
for (Blob blob : blobPage.iterateAll()) {
blobIdList.add(blob.getBlobId());
}
storage.delete(blobIdList);
回答1:
Buckets are the basic containers that hold your data. You have a bucket with name "bucketname.appspot.com". "bucketname.appspot.com/test" is your bucket name plus a folder, so its not a valid name of your bucket. By calling bucket.delete(...) you can delete only the whole bucket, but you cannot delete a folder in a bucket. Use GcsService to delete files or folders.
String bucketName = "bucketname.appspot.com";
GcsService gcsService = GcsServiceFactory.createGcsService(RetryParams.getDefaultInstance());
gcsService.delete(new GcsFilename(bucketName, "test"));
回答2:
I posted a possible solution over at https://stackoverflow.com/a/52580756/4752490 and will post it here too.
Here is one solution to delete files in a folder in Firebase Storage using Firebase Functions.
It assumes you have models stored under /MyStorageFilesInDatabaseTrackedHere/path1/path2 in your Firebase Database.
Those models will have a field named "filename" which will have the name of the file in Firebase Storage.
The workflow is:
- Delete the folder in Firebase Database that contains the list of models
- Listen for the deletion of that folder via Firebase Functions
- This function will loop over the children of the folder, obtain the filename and delete it in Storage.
(Disclaimer: the folder in Storage is still leftover at the end of this function so another call needs to be made to remove it.)
// 1. Define your Firebase Function to listen for deletions on your path
exports.myFilesDeleted = functions.database
.ref('/MyStorageFilesInDatabaseTrackedHere/{dbpath1}/{dbpath2}')
.onDelete((change, context) => {
// 2. Create an empty array that you will populate with promises later
var allPromises = [];
// 3. Define the root path to the folder containing files
// You will append the file name later
var photoPathInStorageRoot = '/MyStorageTopLevelFolder/' + context.params.dbpath1 + "/" + context.params.dbpath2;
// 4. Get a reference to your Firebase Storage bucket
var fbBucket = admin.storage().bucket();
// 5. "change" is the snapshot containing all the changed data from your
// Firebase Database folder containing your models. Each child has a model
// containing your file filename
if (change.hasChildren()) {
change.forEach(snapshot => {
// 6. Get the filename from the model and
// form the fully qualified path to your file in Storage
var filenameInStorage = photoPathInStorageRoot + "/" + snapshot.val().filename;
// 7. Create reference to that file in the bucket
var fbBucketPath = fbBucket.file(filenameInStorage);
// 8. Create a promise to delete the file and add it to the array
allPromises.push(fbBucketPath.delete());
});
}
// 9. Resolve all the promises (i.e. delete all the files in Storage)
return Promise.all(allPromises);
});
来源：https://stackoverflow.com/questions/43686101/delete-folder-from-firebase-storage-using-google-cloud-storage