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ensure_build_metadata() function for metadata

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This will be run at compile time - the goal is to generate a build-
metadata.json file with a bunch of useful facts about the databases that could
be expensive to generate at run-time.

Example metadata:

    {
        "flights": {
        "file": "flights.db",
        "tables": {
            "airlines": 6048,
            "airports": 8107,
            "routes": 67663
        },
        "hash": "07d1283e07786b1235bb7041ea445ae103d1571565580a29eab0203c555725fd"
    }

So far we have a sha256 hash of the database file itself, plus a row count for
each table.

Fixes #11
This commit is contained in:
Simon Willison 2017-10-23 09:02:40 -07:00
commit 6a0c5de615
3 changed files with 51 additions and 0 deletions
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@ -1,3 +1,5 @@
build-metadata.json
# Byte-compiled / optimized / DLL files
__pycache__/
*.py[cod]