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#!/usr/bin/python
#
# Copyright (c) 2011 The Chromium Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
""" Output file objects for generator. """
import os
import time
import sys
from idl_log import ErrOut, InfoOut, WarnOut
from stat import *
#
# IDLOutFile
#
# IDLOutFile provides a temporary output file. By default, the object will
# not write the output if the file already exists, and matches what will be
# written. This prevents the timestamp from changing to optimize cases where
# the output files are used by a timestamp dependent build system
#
class IDLOutFile(object):
def __init__(self, filename, always_write = False, create_dir = True):
self.filename = filename
self.always_write = always_write
self.create_dir = create_dir
self.outlist = []
self.open = True
# Append to the output if the file is still open
def Write(self, string):
if not self.open:
raise RuntimeError('Could not write to closed file %s.' % self.filename)
self.outlist.append(string)
# Close the file
def Close(self):
filename = os.path.realpath(self.filename)
self.open = False
outtext = ''.join(self.outlist)
if not self.always_write:
if os.path.isfile(filename):
intext = open(filename, 'r').read()
else:
intext = None
if intext == outtext:
InfoOut.Log('Output %s unchanged.' % self.filename)
return False
try:
# If the directory does not exit, try to create it, if we fail, we
# still get the exception when the file is openned.
basepath, leafname = os.path.split(filename)
if basepath and not os.path.isdir(basepath) and self.create_dir:
InfoOut.Log('Creating directory: %s\n' % basepath)
os.makedirs(basepath)
outfile = open(filename, 'w')
outfile.write(''.join(self.outlist))
InfoOut.Log('Output %s written.' % self.filename)
return True
except IOError as (errno, strerror):
ErrOut.Log("I/O error(%d): %s" % (errno, strerror))
except:
ErrOut.Log("Unexpected error: %s" % sys.exc_info()[0])
raise
return False
def TestFile(name, stringlist, force, update):
errors = 0
# Get the old timestamp
if os.path.exists(name):
old_time = os.stat(filename)[ST_MTIME]
else:
old_time = 'NONE'
# Create the file and write to it
out = IDLOutFile(filename, force)
for item in stringlist:
out.Write(item)
# We wait for flush to force the timestamp to change
time.sleep(2)
wrote = out.Close()
cur_time = os.stat(filename)[ST_MTIME]
if update:
if not wrote:
ErrOut.Log('Failed to write output %s.' % filename)
return 1
if cur_time == old_time:
ErrOut.Log('Failed to update timestamp for %s.' % filename)
return 1
else:
if wrote:
ErrOut.Log('Should not have writen output %s.' % filename)
return 1
if cur_time != old_time:
ErrOut.Log('Should not have modified timestamp for %s.' % filename)
return 1
return 0
if __name__ == '__main__':
errors = 0
stringlist = ['Test', 'Testing\n', 'Test']
filename = 'outtest.txt'
# Test forcibly writing a file
errors += TestFile(filename, stringlist, force=True, update=True)
# Test conditionally writing the file skipping
errors += TestFile(filename, stringlist, force=False, update=False)
# Test conditionally writing the file updating
errors += TestFile(filename, stringlist + ['X'], force=False, update=True)
# Clean up file
os.remove(filename)
if not errors: InfoOut.Log('All tests pass.')
sys.exit(errors)
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