52 lines
1.7 KiB
Python
52 lines
1.7 KiB
Python
import hashlib
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class Chunk:
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"""A class defining a single chunk of a file to be uploaded"""
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@staticmethod
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def fromFile(fileobj, count: int, chunksize: int):
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"""Create a new Chunk object from a File
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Args:
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fileobj (classes.file.File): The file object from local storage
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count (int): Position of the current chunk in the list of total
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chunks (first index: 0) or -1 to get the complete file
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chunksize (int): Size of each chunk in bytes
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Returns:
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classes.chunk.Chunk: A Chunk object containing the portion of the
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File object beginning at (count * chunksize) bytes and ending at
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((count + 1) * chunksize - 1) bytes
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"""
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return fileobj.getChunk(count, chunksize)
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def __init__(self, fileobj, count: int, data: bytes) -> None:
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"""Initialize a new Chunk object
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Args:
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fileobj (classes.file.File): The file object from local storage
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count (int): Position of the current chunk in the list of total
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chunks (first index: 0) or -1 to get the complete file
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data (bytes): Content of the chunk
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"""
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self.file = fileobj
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self.count = count if count >= 0 else "complete"
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self.data = data
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def getTempName(self) -> str:
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"""Get filename for this Chunk in the temp directory on the Vessel
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Returns:
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str: Filename to use for this chunk in the Vessel tempdir
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"""
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return f"{self.file.uuid}_{self.count}.part"
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def getHash(self) -> str:
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"""Generate a hash for this Chunk
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Returns:
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str: SHA256 hash of Chunk.data
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"""
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return hashlib.sha256(self.data).hexdigest()
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