Package madgraph :: Package iolibs :: Module files
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Source Code for Module madgraph.iolibs.files

  1  ################################################################################ 
  2  # 
  3  # Copyright (c) 2009 The MadGraph5_aMC@NLO Development team and Contributors 
  4  # 
  5  # This file is a part of the MadGraph5_aMC@NLO project, an application which  
  6  # automatically generates Feynman diagrams and matrix elements for arbitrary 
  7  # high-energy processes in the Standard Model and beyond. 
  8  # 
  9  # It is subject to the MadGraph5_aMC@NLO license which should accompany this  
 10  # distribution. 
 11  # 
 12  # For more information, visit madgraph.phys.ucl.ac.be and amcatnlo.web.cern.ch 
 13  # 
 14  ################################################################################ 
 15   
 16  """Methods and classes dealing with file access.""" 
 17   
 18  import logging 
 19  import os 
 20  import shutil 
 21   
 22   
 23  logger = logging.getLogger('madgraph.files') 
 24   
 25  #=============================================================================== 
 26  # read_from_file 
 27  #=============================================================================== 
28 -def read_from_file(filename, myfunct, *args, **opt):
29 """Open a file, apply the function myfunct (with sock as an arg) 30 on its content and return the result. Deals properly with errors and 31 returns None if something goes wrong. 32 """ 33 try: 34 sock = open(filename, 'r') 35 try: 36 ret_value = myfunct(sock, *args) 37 finally: 38 sock.close() 39 except IOError, (errno, strerror): 40 if opt.has_key('print_error'): 41 if not opt['print_error']: 42 return None 43 logger.error("I/O error on file %s (%s): %s" % (filename,errno, strerror)) 44 return None 45 46 return ret_value
47 48 #=============================================================================== 49 # write_to_file 50 #===============================================================================
51 -def write_to_file(filename, myfunct, *args, **opts):
52 """Open a file for writing, apply the function myfunct (with sock as an arg) 53 on its content and return the result. Deals properly with errors and 54 returns None if something goes wrong. 55 """ 56 57 try: 58 sock = open(filename, 'w') 59 try: 60 ret_value = myfunct(sock, *args) 61 finally: 62 sock.close() 63 except IOError, (errno, strerror): 64 if 'log' not in opts or opts['log']: 65 logger.error("I/O error (%s): %s" % (errno, strerror)) 66 return None 67 68 return ret_value
69 70 #=============================================================================== 71 # append_to_file 72 #===============================================================================
73 -def append_to_file(filename, myfunct, *args):
74 """Open a file for appending, apply the function myfunct (with 75 sock as an arg) on its content and return the result. Deals 76 properly with errors and returns None if something goes wrong. 77 """ 78 79 try: 80 sock = open(filename, 'a') 81 try: 82 ret_value = myfunct(sock, *args) 83 finally: 84 sock.close() 85 except IOError, (errno, strerror): 86 logger.error("I/O error (%s): %s" % (errno, strerror)) 87 return None 88 89 return ret_value
90 91 #=============================================================================== 92 # check piclke validity 93 #===============================================================================
94 -def is_uptodate(picklefile, path_list=None, min_time=1343682423):
95 """Check if the pickle files is uptodate compare to a list of files. 96 If no files are given, the pickle files is checked against it\' current 97 directory""" 98 99 if not os.path.exists(picklefile): 100 return False 101 102 if path_list is None: 103 dirpath = os.path.dirname(picklefile) 104 path_list = [ os.path.join(dirpath, file) for file in \ 105 os.listdir(dirpath)] 106 107 assert type(path_list) == list, 'is_update expect a list of files' 108 109 pickle_date = os.path.getctime(picklefile) 110 if pickle_date < min_time: 111 return False 112 113 for path in path_list: 114 try: 115 if os.path.getmtime(path) > pickle_date: 116 return False 117 except Exception: 118 continue 119 #all pass 120 return True
121 122 123 ################################################################################ 124 ## helper function for universal file treatment 125 ################################################################################
126 -def format_path(path):
127 """Format the path in local format taking in entry a unix format""" 128 if path[0] != '/': 129 return os.path.join(*path.split('/')) 130 else: 131 return os.path.sep + os.path.join(*path.split('/'))
132
133 -def cp(path1, path2, log=True, error=False):
134 """ simple cp taking linux or mix entry""" 135 path1 = format_path(path1) 136 path2 = format_path(path2) 137 try: 138 shutil.copy(path1, path2) 139 except IOError, why: 140 try: 141 if os.path.exists(path2): 142 path2 = os.path.join(path2, os.path.split(path1)[1]) 143 shutil.copytree(path1, path2) 144 except IOError, why: 145 if error: 146 raise 147 if log: 148 logger.warning(why) 149 except shutil.Error: 150 # idetical file 151 pass
152
153 -def rm(path, log=True):
154 """removes path, that can be a single element or a list""" 155 if type(path) == list: 156 for p in path: 157 rm(p, log) 158 else: 159 path = format_path(path) 160 try: 161 os.remove(path) 162 except OSError: 163 shutil.rmtree(path, ignore_errors = True)
164 165 166
167 -def mv(path1, path2):
168 """simple mv taking linux or mix format entry""" 169 path1 = format_path(path1) 170 path2 = format_path(path2) 171 try: 172 shutil.move(path1, path2) 173 except Exception: 174 # An error can occur if the files exist at final destination 175 if os.path.isfile(path2): 176 os.remove(path2) 177 shutil.move(path1, path2) 178 return 179 elif os.path.isdir(path2) and os.path.exists( 180 os.path.join(path2, os.path.basename(path1))): 181 path2 = os.path.join(path2, os.path.basename(path1)) 182 os.remove(path2) 183 shutil.move(path1, path2) 184 else: 185 raise
186
187 -def put_at_end(src, *add):
188 189 with open(src,'ab') as wfd: 190 for f in add: 191 with open(f,'rb') as fd: 192 shutil.copyfileobj(fd, wfd, 1024*1024*100)
193 #100Mb chunk to avoid memory issue 194 195
196 -def ln(file_pos, starting_dir='.', name='', log=True, cwd=None, abspath=False):
197 """a simple way to have a symbolic link without to have to change directory 198 starting_point is the directory where to write the link 199 file_pos is the file to link 200 WARNING: not the linux convention 201 """ 202 file_pos = format_path(file_pos) 203 starting_dir = format_path(starting_dir) 204 if not name: 205 name = os.path.split(file_pos)[1] 206 207 if cwd: 208 if not os.path.isabs(file_pos): 209 file_pos = os.path.join(cwd, file_pos) 210 if not os.path.isabs(starting_dir): 211 starting_dir = os.path.join(cwd, starting_dir) 212 213 # Remove existing link if necessary 214 path = os.path.join(starting_dir, name) 215 if os.path.exists(path): 216 if os.path.realpath(path) != os.path.realpath(file_pos): 217 os.remove(os.path.join(starting_dir, name)) 218 else: 219 return 220 221 if not abspath: 222 target = os.path.relpath(file_pos, starting_dir) 223 else: 224 target = file_pos 225 226 try: 227 os.symlink(target, os.path.join(starting_dir, name)) 228 except Exception, error: 229 if log: 230 logger.debug(error) 231 logger.warning('Could not link %s at position: %s' % (file_pos, \ 232 os.path.realpath(starting_dir)))
233
234 -def copytree(src, dst):
235 if not os.path.exists(dst): 236 os.makedirs(dst) 237 for item in os.listdir(src): 238 s = os.path.join(src, item) 239 d = os.path.join(dst, item) 240 if os.path.isdir(s): 241 copytree(s, d, symlinks, ignore) 242 else: 243 shutil.copy2(s, d)
244