import gflags
import httplib
import httplib2
-import logging
import os
import pprint
import sys
import fcntl
import time
import threading
+import collections
+from arvados.retry import retry_method
from keep import *
import config
import errors
OFFSET = 2
SEGMENTSIZE = 3
-def locators_and_ranges(self, data_locators, range_start, range_size):
- '''returns list of [block locator, blocksize, segment offset, segment size] that satisfies the range'''
+def locators_and_ranges(data_locators, range_start, range_size, debug=False):
+ '''
+ Get blocks that are covered by the range
+ data_locators: list of [locator, block_size, block_start], assumes that blocks are in order and contigous
+ range_start: start of range
+ range_size: size of range
+ returns list of [block locator, blocksize, segment offset, segment size] that satisfies the range
+ '''
+ if range_size == 0:
+ return []
resp = []
range_start = long(range_start)
range_size = long(range_size)
range_end = range_start + range_size
block_start = 0L
- for locator, block_size, block_start in data_locators:
+
+ # range_start/block_start is the inclusive lower bound
+ # range_end/block_end is the exclusive upper bound
+
+ hi = len(data_locators)
+ lo = 0
+ i = int((hi + lo) / 2)
+ block_size = data_locators[i][BLOCKSIZE]
+ block_start = data_locators[i][OFFSET]
+ block_end = block_start + block_size
+ if debug: print '---'
+
+ # perform a binary search for the first block
+ # assumes that all of the blocks are contigious, so range_start is guaranteed
+ # to either fall into the range of a block or be outside the block range entirely
+ while not (range_start >= block_start and range_start < block_end):
+ if lo == i:
+ # must be out of range, fail
+ return []
+ if range_start > block_start:
+ lo = i
+ else:
+ hi = i
+ i = int((hi + lo) / 2)
+ if debug: print lo, i, hi
+ block_size = data_locators[i][BLOCKSIZE]
+ block_start = data_locators[i][OFFSET]
+ block_end = block_start + block_size
+
+ while i < len(data_locators):
+ locator, block_size, block_start = data_locators[i]
block_end = block_start + block_size
- if range_end < block_start:
+ if debug:
+ print locator, "range_start", range_start, "block_start", block_start, "range_end", range_end, "block_end", block_end
+ if range_end <= block_start:
# range ends before this block starts, so don't look at any more locators
break
- if range_start > block_end:
+
+ #if range_start >= block_end:
# range starts after this block ends, so go to next block
- next
- elif range_start >= block_start and range_end <= block_end:
+ # we should always start at the first block due to the binary above, so this test is redundant
+ #next
+
+ if range_start >= block_start and range_end <= block_end:
# range starts and ends in this block
resp.append([locator, block_size, range_start - block_start, range_size])
- elif range_start >= block_start:
+ elif range_start >= block_start and range_end > block_end:
# range starts in this block
resp.append([locator, block_size, range_start - block_start, block_end - range_start])
elif range_start < block_start and range_end > block_end:
# range starts in a previous block and ends in this block
resp.append([locator, block_size, 0L, range_end - block_start])
block_start = block_end
+ i += 1
return resp
self.segments = segments
self._name = name
self._filepos = 0L
+ self.num_retries = stream.num_retries
def name(self):
return self._name
def seek(self, pos):
self._filepos = min(max(pos, 0L), self.size())
- def tell(self, pos):
+ def tell(self):
return self._filepos
def size(self):
- n = self.data_locators[-1]
- return n[self.OFFSET] + n[self.BLOCKSIZE]
+ n = self.segments[-1]
+ return n[OFFSET] + n[BLOCKSIZE]
- def read(self, size, **kwargs):
+ @retry_method
+ def read(self, size, num_retries=None):
"""Read up to 'size' bytes from the stream, starting at the current file position"""
if size == 0:
return ''
data = ''
- for locator, blocksize, segmentoffset, segmentsize in locators_and_ranges(self.segments, self._filepos, size):
- self._stream.seek(locator+segmentoffset)
- data += self._stream.read(segmentsize)
- self._filepos += len(data)
+ available_chunks = locators_and_ranges(self.segments, self._filepos, size)
+ if available_chunks:
+ locator, blocksize, segmentoffset, segmentsize = available_chunks[0]
+ data = self._stream.readfrom(locator+segmentoffset, segmentsize,
+ num_retries=num_retries)
+
+ self._filepos += len(data)
return data
- def readall(self, size=2**20, **kwargs):
+ @retry_method
+ def readfrom(self, start, size, num_retries=None):
+ """Read up to 'size' bytes from the stream, starting at 'start'"""
+ if size == 0:
+ return ''
+
+ data = []
+ for locator, blocksize, segmentoffset, segmentsize in locators_and_ranges(self.segments, start, size):
+ data.append(self._stream.readfrom(locator+segmentoffset, segmentsize,
+ num_retries=num_retries))
+ return ''.join(data)
+
+ @retry_method
+ def readall(self, size=2**20, num_retries=None):
while True:
- data = self.read(size, **kwargs)
+ data = self.read(size, num_retries=num_retries)
if data == '':
break
yield data
- def bunzip2(self, size):
- decompressor = bz2.BZ2Decompressor()
- for segment in self.readall(size):
- data = decompressor.decompress(segment)
+ @retry_method
+ def decompress(self, decompress, size, num_retries=None):
+ for segment in self.readall(size, num_retries):
+ data = decompress(segment)
if data and data != '':
yield data
- def gunzip(self, size):
- decompressor = zlib.decompressobj(16+zlib.MAX_WBITS)
- for segment in self.readall(size):
- data = decompressor.decompress(decompressor.unconsumed_tail + segment)
- if data and data != '':
- yield data
-
- def readall_decompressed(self, size=2**20):
+ @retry_method
+ def readall_decompressed(self, size=2**20, num_retries=None):
self.seek(0)
if re.search('\.bz2$', self._name):
- return self.bunzip2(size)
+ dc = bz2.BZ2Decompressor()
+ return self.decompress(dc.decompress, size,
+ num_retries=num_retries)
elif re.search('\.gz$', self._name):
- return self.gunzip(size)
+ dc = zlib.decompressobj(16+zlib.MAX_WBITS)
+ return self.decompress(lambda segment: dc.decompress(dc.unconsumed_tail + segment),
+ size, num_retries=num_retries)
else:
- return self.readall(size)
+ return self.readall(size, num_retries=num_retries)
- def readlines(self, decompress=True):
- if decompress:
- datasource = self.readall_decompressed()
- else:
- self._stream.seek(self._pos + self._filepos)
- datasource = self.readall()
+ @retry_method
+ def readlines(self, decompress=True, num_retries=None):
+ read_func = self.readall_decompressed if decompress else self.readall
data = ''
- for newdata in datasource:
+ for newdata in read_func(num_retries=num_retries):
data += newdata
sol = 0
while True:
if data != '':
yield data
+ def as_manifest(self):
+ manifest_text = ['.']
+ manifest_text.extend([d[LOCATOR] for d in self._stream._data_locators])
+ manifest_text.extend(["{}:{}:{}".format(seg[LOCATOR], seg[BLOCKSIZE], self.name().replace(' ', '\\040')) for seg in self.segments])
+ return arvados.CollectionReader(' '.join(manifest_text) + '\n').manifest_text()
-class StreamReader(object):
- def __init__(self, tokens):
- self._tokens = tokens
- self._pos = 0L
+class StreamReader(object):
+ def __init__(self, tokens, keep=None, debug=False, _empty=False,
+ num_retries=0):
self._stream_name = None
- self.data_locators = []
- self.files = {}
+ self._data_locators = []
+ self._files = collections.OrderedDict()
+ self._keep = keep
+ self.num_retries = num_retries
streamoffset = 0L
- for tok in self._tokens:
+ # parse stream
+ for tok in tokens:
+ if debug: print 'tok', tok
if self._stream_name == None:
self._stream_name = tok.replace('\\040', ' ')
continue
s = re.match(r'^[0-9a-f]{32}\+(\d+)(\+\S+)*$', tok)
if s:
blocksize = long(s.group(1))
- self.data_locators.append([tok, blocksize, streamoffset])
+ self._data_locators.append([tok, blocksize, streamoffset])
streamoffset += blocksize
continue
pos = long(s.group(1))
size = long(s.group(2))
name = s.group(3).replace('\\040', ' ')
- if name not in self.files:
- self.files[name] = StreamFileReader(self, [[pos, size, 0]], name)
+ if name not in self._files:
+ self._files[name] = StreamFileReader(self, [[pos, size, 0]], name)
else:
- n = self.files[name]
+ n = self._files[name]
n.segments.append([pos, size, n.size()])
continue
raise errors.SyntaxError("Invalid manifest format")
-
- def tokens(self):
- return self._tokens
def name(self):
return self._stream_name
- def all_files(self):
- return self.files.values()
-
- def seek(self, pos):
- """Set the position of the next read operation."""
- self._pos = pos
+ def files(self):
+ return self._files
- def tell(self):
- return self._pos
+ def all_files(self):
+ return self._files.values()
def size(self):
- n = self.data_locators[-1]
- return n[self.OFFSET] + n[self.BLOCKSIZE]
+ n = self._data_locators[-1]
+ return n[OFFSET] + n[BLOCKSIZE]
- def locators_and_ranges(self.data_locators, self._pos, size)
+ def locators_and_ranges(self, range_start, range_size):
+ return locators_and_ranges(self._data_locators, range_start, range_size)
- def read(self, size):
- """Read up to 'size' bytes from the stream, starting at the current file position"""
+ @retry_method
+ def readfrom(self, start, size, num_retries=None):
+ """Read up to 'size' bytes from the stream, starting at 'start'"""
if size == 0:
return ''
- data = ''
- for locator, blocksize, segmentoffset, segmentsize in locators_and_ranges(self.data_locators, self._pos, size):
- data += Keep.get(locator)[segmentoffset:segmentoffset+segmentsize]
- self._pos += len(data)
- return data
+ if self._keep is None:
+ self._keep = KeepClient(num_retries=self.num_retries)
+ data = []
+ for locator, blocksize, segmentoffset, segmentsize in locators_and_ranges(self._data_locators, start, size):
+ data.append(self._keep.get(locator, num_retries=num_retries)[segmentoffset:segmentoffset+segmentsize])
+ return ''.join(data)
+
+ def manifest_text(self, strip=False):
+ manifest_text = [self.name().replace(' ', '\\040')]
+ if strip:
+ for d in self._data_locators:
+ m = re.match(r'^[0-9a-f]{32}\+\d+', d[LOCATOR])
+ manifest_text.append(m.group(0))
+ else:
+ manifest_text.extend([d[LOCATOR] for d in self._data_locators])
+ manifest_text.extend([' '.join(["{}:{}:{}".format(seg[LOCATOR], seg[BLOCKSIZE], f.name().replace(' ', '\\040'))
+ for seg in f.segments])
+ for f in self._files.values()])
+ return ' '.join(manifest_text) + '\n'
projects / arvados.git / blobdiff