A frequent challenge to both efficient, reproducible, and compact workflows is acquiring data from external sources. For instance, on a current project, I download Facebook's pre-trained fasttext word embedding model which is ~6GB. This takes a while. I don't want to include this file in the repository, instead putting code in the repo so collaborators get it as part of the workflow. I may or may want to update this when the remote sources changes. If I do, unfortunately, I need to download the whole thing to hash the file and check if it is different than before.

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However, for many cases, there are strong heuristics that would allow me to check if the remote file is updated prior deciding whether to download. I think drake, or a small helper package that drake would use, seems a great home for functions to use these heuristics.

Some heuristics may be available in a file's content header which can be queried via a HEAD() call without downloading a file. These include:

• The file size (eh)
• The date modified (OK)
• A file hash (💯)

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If the file is on an FTP server, the modified date and size should be available as well.

Furthermore, based on parsing the URL itself, one could ascertain information on the file state for many important sources.:

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• CD, Released by Drake, in genre Rap/HipHop, on. 2-3 business days, $10.99, Buy. MP3 Album: $9.99, Download. We'll Be Fine.
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• Data at a DOI should be fixed, but may be updated if the DOI is versioned. A the fixed DOI version should be able to be determined via API or return headers. Some repositories have hash and other metadata available to query.
• Data in an S3 bucket should have a hash that can be queried via API if it's not in the header
• Data on GitHub should have a hash that can be queried via API if it's not in the header

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So, if drake detects a URL in a work plan, like this

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It could run the url against something like spyglass::check_remote_file(url, spyobj), where spyobj holds all the available heuristic checks. Checking against this object would tell you if the file has changed, and also what heuristics it is based on. drake could keep spyobj in the cache for the next lookup. drake users could decide on heuristics they would accept as a work plan option (hash or date-modified + size probably being the default).

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OK, maybe this is a bit out of scope and we should build this package separately, but interested in your thoughts!

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Tagging @sckott and @willpearse based on their suppdata package and related DOI-parsing packages