45 lines
2.2 KiB
Text
45 lines
2.2 KiB
Text
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THINGS THAT CAN HAPPEN
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├───File exists
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│ ├───User disables overwrite
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│ │ └───Return because there's nothing to do
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│ │
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│ ├───User enables overwrite
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│ │ ├───User requests range
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│ │ │ └───Raise exception because requesting a range and forcing overwrite are mutually exclusive
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│ │ │
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│ │ └───User does not request range
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│ │ └───File opened, truncated, full download
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│ │
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│ └───User does not specify overwrite
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│ ├───File is same size as content-length
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│ │ └───Return because there's nothing to do.
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│ │
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│ ├───User requests range
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│ │ ├───Server respects range
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│ │ │ └───File opened, seeked to request, bytes filled in
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│ │ │
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│ │ └───Server does not respect range
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│ │ └───Raise exception because user's request can't be fulfilled
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│ │
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│ └───User does not request range
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│ ├───Server respects range
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│ │ └───File is opened, seeked to end, download resumes
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│ │
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│ └───Server does not respect range
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│ └───Ask for permission to overwrite from beginning
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│
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└───File does not exist
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├───User requests range
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│ ├───Server respects range
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│ │ └───File created, seeked to request, bytes filled in. everything else left 0
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│ └───Server does not respect range
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│ └───Raise exception because user's request can't be fulfilled
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│
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└───User does not request range
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└───File created, full download
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Possible amibiguity: If the user requests a range, and the file does not exist, does he want:
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1. to fill the file with zeroes, and patch the requested bytes into their correct spot; or
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2. to create the file empty, and only write the requested bytes?
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I will assume #1 because that plays nicely with other Things That Can Happen, such as letting the user patch the other bytes in later.
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