zarrinfo can not access files on s3 storage

[Ajaxels]

Hi,
I am not able to get information about the dataset that is stored on s3 storage:

zarrUrl = 'https://s3.embl.de/i2k-2020/platy-raw.ome.zarr';
info = zarrinfo(zarrUrl);

I can access the dataset using MoBIE Fiji Viewer, but not Matlab.

[abhibaruah]

Hi @Ajaxels,
Do you know if any credentials are needed to access this S3 bucket?
What region is the S3 bucket located at?

[Ajaxels]

Nothing is needed, it is in Germany

[jm9176]

I tried out the same workflow with s3:// and http:// syntax, and only s3:// syntax is working fine, but http:// syntax throws "folders do not exist" error

>> zarrinfo('s3://<my_test_bucket>/prt_grp/arr_1')

ans = 

  struct with fields:

                 chunks: [2×1 double]
             compressor: []
    dimension_separator: '.'
                  dtype: '<f8'
             fill_value: -9
                filters: []
                  order: 'C'
                  shape: [2×1 double]
            zarr_format: 2
              node_type: 'array'

[Ajaxels]

@jm9176 have you been able to open 'https://s3.embl.de/i2k-2020/platy-raw.ome.zarr ?

[jm9176]

@Ajaxels No, I get the following error,

Error using zarrinfo (line 12)
 info = zarrinfo(zarrUrl);
                 ^^^^^^^
Invalid argument at position 1. These folders do not exist: 'https://s3.embl.de/i2k-2020/platy-raw.ome.zarr'.

However, I did try a different s3 bucket, and it worked fine as I mentioned in my comment above, but I encountered the same error when accessing buckets with https:// syntax.

>> zarrcreate('s3://<my_test_bucket>/prt_grp/arr_1',[10 10]);
>> zarrwrite('s3://<my_test_bucket>/prt_grp/arr_1',ones([10 10]));
>> zarrwriteatt('s3://<my_test_bucket>/prt_grp/arr_1','myatttr',10);
>> zarrinfo('s3://<my_test_bucket>/prt_grp/arr_1')

ans = 

  struct with fields:

                 chunks: [2×1 double]
             compressor: []
    dimension_separator: '.'
                  dtype: '<f8'
             fill_value: []
                filters: []
                  order: 'C'
                  shape: [2×1 double]
            zarr_format: 2
              node_type: 'array'
                myatttr: 10