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import os
from collections import namedtuple
from subprocess import Popen, PIPE
from support import CatalystError
class HashMap(object):
'''Class for handling
Catalyst's hash generation'''
fields = ["func", "cmd", "args", "id"]
def __init__(self, hashes=None):
'''Class init
@param hashes: dictionary of Key:[function, cmd, cmd_args, Print string]
@param fields: list of ordered field names for the hashes
eg: ["func", "cmd", "args", "id"]
'''
if hashes is None:
hashes = {}
#self.hashes = {}
self.hash_map = {}
# create the hash definition namedtuple classes
for name in list(hashes):
#obj = self.hashes[name] = namedtuple(name, self.fields)
obj = namedtuple(name, self.fields)
obj.__slots__ = ()
self.hash_map[name] = obj._make(hashes[name])
del obj
def generate_hash(self, file_, hash_="crc32", verbose=False):
'''Prefered method of generating a hash for the passed in file_
@param file_: the file to generate the hash for
@param hash_: the hash algorythm to use
@param verbose: boolean
@returns the hash result
'''
try:
return getattr(self, self.hash_map[hash_].func)(
file_,
hash_,
verbose
)
except:
raise CatalystError("Error generating hash, is appropriate " + \
"utility installed on your system?", traceback=True)
def calc_hash(self, file_, hash_, verbose=False):
'''
Calculate the hash for "file_"
@param file_: the file to generate the hash for
@param hash_: the hash algorythm to use
@param verbose: boolean
@returns the hash result
'''
_hash = self.hash_map[hash_]
args = [_hash.cmd]
args.extend(_hash.args)
args.append(file_)
source = Popen(args, stdout=PIPE)
mylines = source.communicate()[0]
mylines=mylines[0].split()
result=mylines[0]
if verbose:
print _hash.id + " (%s) = %s" % (file_, result)
return result
def calc_hash2(self, file_, hash_type, verbose=False):
'''
Calculate the hash for "file_"
@param file_: the file to generate the hash for
@param hash_: the hash algorythm to use
@param verbose: boolean
@returns the hash result
'''
_hash = self.hash_map[hash_type]
args = [_hash.cmd]
args.extend(_hash.args)
args.append(file_)
#print("DEBUG: calc_hash2; args =", args)
source = Popen(args, stdout=PIPE)
output = source.communicate()
lines = output[0].split('\n')
#print("DEBUG: calc_hash2; output =", output)
header = lines[0]
h_f = lines[1].split()
hash_result = h_f[0]
short_file = os.path.split(h_f[1])[1]
result = header + "\n" + hash_result + " " + short_file + "\n"
if verbose:
print header+" (%s) = %s" % (short_file, result)
return result
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