def repair(path, indices):
"""
Repairs one or multiple blocks of a document
Args:
path(str): Path to the document
indices(list(int)): Indices of the blocks to retrieve
"""
if not isinstance(path, str) or not path:
raise ValueError("Argument path must be a non-empty string")
if not isinstance(indices, list):
raise ValueError("Argument indices must be list")
if not indices:
return
for index, index_to_reconstruct in enumerate(indices):
if not isinstance(index_to_reconstruct, int):
error_message = "indices[{:d}] is not an integer".format(index)
raise ValueError(error_message)
erasures_threshold = get_erasure_threshold()
dispatcher = Dispatcher(get_dispatcher_configuration())
files = Files()
if len(indices) <= erasures_threshold:
reconstructed_blocks = reconstruct_with_RS(path, indices)
for index in reconstructed_blocks:
reconstructed_block = reconstructed_blocks[index]
metablock = files.get_block(compute_block_key(path, index))
for provider_name in set(metablock.providers):
dispatcher.providers[provider_name].put(reconstructed_block,
metablock.key)
else:
#FIXME order of blocks to reach e erasures than do RS reconstuction
indices.sort()
while len(indices) > erasures_threshold:
index = indices.pop(0)
reconstructed_block = reconstruct_as_pointer(path, index)
metablock = files.get_block(compute_block_key(path, index))
for provider_name in set(metablock.providers):
dispatcher.providers[provider_name].put(reconstructed_block,
metablock.key)
reconstructed_blocks = reconstruct_with_RS(path, indices)
for index in reconstructed_blocks:
reconstructed_block = reconstructed_blocks[index]
metablock = files.get_block(compute_block_key(path, index))
for provider_name in set(metablock.providers):
dispatcher.providers[provider_name].put(reconstructed_block,
metablock.key)
def get_block_metadata(path, index):
"""
Returns the block metadata
Args:
path(str): Path to the file
index(int): Index of the block in the file
Returns:
MetaBlock: Block metadata
"""
files = Files()
key = compute_block_key(path, index)
return files.get_block(key)