Refactor xapi-storage-script to use modules #6191
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The `bind` function in xapi-storage-script has lots of implementaions all over the place, making it hard to maintain. Use module abstractions to separate different storage functions. The tricky bit of this is the need to pass `version` and `volume_script_dir` into each storage function calls, and these two variables are determined at runtime. Hence functors are used for this purpose, once the `volume_script_dir` is determined when `bind` is called, pass this as inside the `RuntimeMeta` module to the relevant implementations. The `version` global variable, however, is populated when `Query.query` is called, so create an alias in the `RuntimeMeta` module so that it can be used in the storage function implementations. Signed-off-by: Vincent Liu <[email protected]>
psafont
reviewed
Dec 20, 2024
| let module RuntimeMeta = struct | ||
| let volume_script_dir = volume_script_dir | ||
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| let version = version |
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If I understood correctly, version is shared among all the modules that implement storage functions. Why is it needed in RuntimeMeta? It looks like it depends on the global variable anyway, so why bother with the indirection?
For volume_script_dir it makes sense because the value is passed when calling bind, but for version, the value is set after calling bind.
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The
bindfunction in xapi-storage-script has lots of implementaions all over the place, making it hard to maintain. Use module abstractions to separate different storage functions.The tricky bit of this is the need to pass
versionandvolume_script_dirinto each storage function calls, and these two variables are determined at runtime. Hence functors are used for this purpose, once thevolume_script_diris determined whenbindis called, pass this as inside theRuntimeMetamodule to the relevant implementations. Theversionglobal variable, however, is populated whenQuery.queryis called, so create an alias in theRuntimeMetamodule so that it can be used in the storage function implementations.