Renaming a file in cloud storage

[John Beckett]

I need to be able to rename a file in Cloud Storage using Go on App Engine.

From what I understand from the docs, I should be able to update an object's attributes using storage.UpdateAttrs.  I've tried to do this with something like the following:

  attribs := storage.ObjectAttrs{Name: "ShorterFileName.png"}

  newObject, err := storage.UpdateAttrs(ctx, oldObject.Bucket, oldObject.Name, attribs)

However, I can't seem to get this to work.  Every time I try use it, I get the following type of error:

googleapi: Error 400: Value 'ShorterFileName.png' in content does not agree with value '20150718/L2FwcGhvc3RpbmdfZXVyb3BlL2Jsb2JzL0FFbkIyVXJGQ0RTVGlRMGFad0VMQWIzaHBQWFM1YnpDVC1SRzBJbzRQTG9BTHJNM1djcl9maXhhTFNleTNOMXJiME04RktyUm5nb2R2Mlp2OTJCbC1XLWRYVGYyNlppbkVBLnkzZ1BDVmYxOVY2VHlhdng'. This can happen when a value set through a parameter is inconsistent with a value set in the request., invalidParameter

I can rename the file by copying the existing file and then deleting the old one, but this takes close to a second, which is far longer than I would imagine it would take to simply update the object attributes.

So, what am I doing wrong with storage.ObjectAttrs?  Is there a more efficient way to rename an object?

[Glenn Lewis]

Hmmm... it looks to me like the Go Veneer storage client library is broken for file renaming.  I apologize for that... it looks like I never fully tested the rename functionality.  :-(

In the meantime, I'm going to see if I can get rename working with the google.golang.org/api/storage/v1 API directly (and then update the first library).

I'll get back to the list when I get it working... it might not be until Monday, looking at the calendar.

-- Glenn

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[John Beckett]

Thanks for the update Glenn.  I can easily wait for next week, and in the mean time, I'll just use the copy + delete method to get things working.

~ John

[Glenn Lewis]

Thanks, John.  I've filed an issue: https://github.com/google/google-api-go-client/issues/88

-- Glenn

[Glenn Lewis]

I just got a reply from a Cloud Storage engineer that the API has no "rename" capability and the best thing to do is copy+delete.

I'll update the issue.  Maybe it would be nice to provide a "Rename" method in the client library to avoid future confusion.

-- Glenn