import collections import hashlib import os import re import threading import functools import copy from ._ranges import locators_and_ranges, Range from .arvfile import StreamFileReader from arvados.retry import retry_method from keep import * import config import errors from _normalize_stream import normalize_stream 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 = collections.OrderedDict() self._keep = keep self.num_retries = num_retries streamoffset = 0L # parse stream for tok in tokens: if debug: print 'tok', tok if self._stream_name is 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(Range(tok, streamoffset, blocksize, 0)) streamoffset += blocksize continue s = re.search(r'^(\d+):(\d+):(\S+)', tok) if s: 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, [Range(pos, 0, size, 0)], name) else: filereader = self._files[name] filereader.segments.append(Range(pos, filereader.size(), size)) continue raise errors.SyntaxError("Invalid manifest format") def name(self): return self._stream_name def files(self): return self._files def all_files(self): return self._files.values() def size(self): n = self._data_locators[-1] return n.range_start + n.range_size def locators_and_ranges(self, range_start, range_size): return locators_and_ranges(self._data_locators, range_start, range_size) @retry_method def _keepget(self, locator, num_retries=None): return self._keep.get(locator, num_retries=num_retries) @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 '' if self._keep is None: self._keep = KeepClient(num_retries=self.num_retries) data = [] for lr in locators_and_ranges(self._data_locators, start, size): data.append(self._keepget(lr.locator, num_retries=num_retries)[lr.segment_offset:lr.segment_offset+lr.segment_size]) 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.range_size, f.name.replace(' ', '\\040')) for seg in f.segments]) for f in self._files.values()]) return ' '.join(manifest_text) + '\n'