def idx_to_cdx(self, idx_iter, query):
blocks = None
ranges = []
for idx in idx_iter:
idx = IDXObject(idx)
if (blocks and blocks.part == idx['part']
and blocks.offset + blocks.length == idx['offset']
and blocks.count < self.max_blocks):
blocks.length += idx['length']
blocks.count += 1
ranges.append(idx['length'])
else:
if blocks:
yield self.block_to_cdx_iter(blocks, ranges, query)
blocks = ZipBlocks(idx['part'], idx['offset'], idx['length'],
1)
ranges = [blocks.length]
if blocks:
yield self.block_to_cdx_iter(blocks, ranges, query)
def gen_idx():
for idx in idx_iter:
yield IDXObject(idx)
def compute_page_range(self, reader, query):
pagesize = query.page_size
if not pagesize:
pagesize = self.max_blocks
else:
pagesize = int(pagesize)
last_line = None
# Get End
end_iter = search(reader, query.end_key, prev_size=1)
try:
end_line = six.next(end_iter)
except StopIteration:
last_line = read_last_line(reader)
end_line = last_line
# Get Start
first_iter = iter_range(reader, query.key, query.end_key, prev_size=1)
try:
first_line = six.next(first_iter)
except StopIteration:
if end_line == last_line and query.key >= last_line:
first_line = last_line
else:
reader.close()
if query.page_count:
yield self._page_info(0, pagesize, 0)
return
first = IDXObject(first_line)
end = IDXObject(end_line)
try:
blocks = end['lineno'] - first['lineno']
total_pages = int(blocks / pagesize) + 1
except:
blocks = -1
total_pages = 1
if query.page_count:
# same line, so actually need to look at cdx
# to determine if it exists
if blocks == 0:
try:
block_cdx_iter = self.idx_to_cdx([first_line], query)
block = six.next(block_cdx_iter)
cdx = six.next(block)
except StopIteration:
total_pages = 0
blocks = -1
yield self._page_info(total_pages, pagesize, blocks + 1)
reader.close()
return
curr_page = query.page
if curr_page >= total_pages or curr_page < 0:
msg = 'Page {0} invalid: First Page is 0, Last Page is {1}'
reader.close()
raise CDXException(msg.format(curr_page, total_pages - 1))
startline = curr_page * pagesize
endline = startline + pagesize - 1
if blocks >= 0:
endline = min(endline, blocks)
if curr_page == 0:
yield first_line
else:
startline -= 1
idxiter = itertools.islice(first_iter, startline, endline)
for idx in idxiter:
yield idx
reader.close()
def test_invalid_idx_format():
with raises(CDXException):
x = IDXObject(b'a b c')