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#! /usr/bin/env python3
# encoding: utf-8
"""
Windows-specific optimizations
This module can help reducing the overhead of listing files on windows
(more than 10000 files). Python 3.5 already provides the listdir
optimization though.
"""
import os
from waflib import Utils, Build, Node, Logs
try:
TP = '%s\\*'.decode('ascii')
except AttributeError:
TP = '%s\\*'
if Utils.is_win32:
from waflib.Tools import md5_tstamp
import ctypes, ctypes.wintypes
FindFirstFile = ctypes.windll.kernel32.FindFirstFileW
FindNextFile = ctypes.windll.kernel32.FindNextFileW
FindClose = ctypes.windll.kernel32.FindClose
FILE_ATTRIBUTE_DIRECTORY = 0x10
INVALID_HANDLE_VALUE = -1
UPPER_FOLDERS = ('.', '..')
try:
UPPER_FOLDERS = [unicode(x) for x in UPPER_FOLDERS]
except NameError:
pass
def cached_hash_file(self):
try:
cache = self.ctx.cache_listdir_cache_hash_file
except AttributeError:
cache = self.ctx.cache_listdir_cache_hash_file = {}
if id(self.parent) in cache:
try:
t = cache[id(self.parent)][self.name]
except KeyError:
raise IOError('Not a file')
else:
# an opportunity to list the files and the timestamps at once
findData = ctypes.wintypes.WIN32_FIND_DATAW()
find = FindFirstFile(TP % self.parent.abspath(), ctypes.byref(findData))
if find == INVALID_HANDLE_VALUE:
cache[id(self.parent)] = {}
raise IOError('Not a file')
cache[id(self.parent)] = lst_files = {}
try:
while True:
if findData.cFileName not in UPPER_FOLDERS:
thatsadir = findData.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY
if not thatsadir:
ts = findData.ftLastWriteTime
d = (ts.dwLowDateTime << 32) | ts.dwHighDateTime
lst_files[str(findData.cFileName)] = d
if not FindNextFile(find, ctypes.byref(findData)):
break
except Exception:
cache[id(self.parent)] = {}
raise IOError('Not a file')
finally:
FindClose(find)
t = lst_files[self.name]
fname = self.abspath()
if fname in Build.hashes_md5_tstamp:
if Build.hashes_md5_tstamp[fname][0] == t:
return Build.hashes_md5_tstamp[fname][1]
try:
fd = os.open(fname, os.O_BINARY | os.O_RDONLY | os.O_NOINHERIT)
except OSError:
raise IOError('Cannot read from %r' % fname)
f = os.fdopen(fd, 'rb')
m = Utils.md5()
rb = 1
try:
while rb:
rb = f.read(200000)
m.update(rb)
finally:
f.close()
# ensure that the cache is overwritten
Build.hashes_md5_tstamp[fname] = (t, m.digest())
return m.digest()
Node.Node.cached_hash_file = cached_hash_file
def get_bld_sig_win32(self):
try:
return self.ctx.hash_cache[id(self)]
except KeyError:
pass
except AttributeError:
self.ctx.hash_cache = {}
self.ctx.hash_cache[id(self)] = ret = Utils.h_file(self.abspath())
return ret
Node.Node.get_bld_sig = get_bld_sig_win32
def isfile_cached(self):
# optimize for nt.stat calls, assuming there are many files for few folders
try:
cache = self.__class__.cache_isfile_cache
except AttributeError:
cache = self.__class__.cache_isfile_cache = {}
try:
c1 = cache[id(self.parent)]
except KeyError:
c1 = cache[id(self.parent)] = []
curpath = self.parent.abspath()
findData = ctypes.wintypes.WIN32_FIND_DATAW()
find = FindFirstFile(TP % curpath, ctypes.byref(findData))
if find == INVALID_HANDLE_VALUE:
Logs.error("invalid win32 handle isfile_cached %r", self.abspath())
return os.path.isfile(self.abspath())
try:
while True:
if findData.cFileName not in UPPER_FOLDERS:
thatsadir = findData.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY
if not thatsadir:
c1.append(str(findData.cFileName))
if not FindNextFile(find, ctypes.byref(findData)):
break
except Exception as e:
Logs.error('exception while listing a folder %r %r', self.abspath(), e)
return os.path.isfile(self.abspath())
finally:
FindClose(find)
return self.name in c1
Node.Node.isfile_cached = isfile_cached
def find_or_declare_win32(self, lst):
# assuming that "find_or_declare" is called before the build starts, remove the calls to os.path.isfile
if isinstance(lst, str):
lst = [x for x in Utils.split_path(lst) if x and x != '.']
node = self.get_bld().search_node(lst)
if node:
if not node.isfile_cached():
try:
node.parent.mkdir()
except OSError:
pass
return node
self = self.get_src()
node = self.find_node(lst)
if node:
if not node.isfile_cached():
try:
node.parent.mkdir()
except OSError:
pass
return node
node = self.get_bld().make_node(lst)
node.parent.mkdir()
return node
Node.Node.find_or_declare = find_or_declare_win32
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