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#!/usr/bin/env python3
# A BATS test helper.
# - Add, delete, or change top level variables within JSON-format iRODS environment configuration files.
# - PRESERVE, RESTORE, and PRESERVE_check operations to assert checkpoints in test setup/teardown phases.
# - Allow variable abbreviation by means of omitting prefix. (Delineated by '*' in a VAR declaration.)
import argparse
import ast
from collections import OrderedDict
import errno
import json
import os
from os.path import (basename, abspath)
import shelve
import sys
tempstore = {}
fds = {}
parser=argparse.ArgumentParser()
parser.add_argument('-c','--clear-store',action='store_true', help='clear store')
parser.add_argument('-s','--store',action='store_true', help='print value of store')
parser.add_argument('-i','--input',action='append', metavar='config_filename',
help='names of files containing JSON configuration')
parser.add_argument('actions', metavar='action', type=str, nargs='*',
help='actions to be applied to the config files. ex:\n'
'VAR="prefix*varname"' '\n'
'varname=pyvalue' '\n'
'RESTORE|PRESERVE[_check]'
)
opt = parser.parse_args()
store = shelve.open(os.path.expanduser('~/.store.{}'.format(basename(sys.argv[0]))))
class JSONUnrepresentable(Exception): pass
# represent OrderedDicts as normal dicts when printing structs loaded from JSON files
def to_dict(s):
try:
s.get("") # throw AttributeError for dict-incompatible types
s = dict(s)
except AttributeError:
pass
if isinstance(s,list):
return [to_dict(item) for item in s]
elif isinstance(s,dict):
return {key:to_dict(value) for key,value in s.items()}
elif isinstance(s,(int,str,float)):
return s
raise JSONUnrepresentable
if opt.store:
import pprint
pprint.pprint(to_dict(store))
exit()
if opt.clear_store:
store.clear()
def PRESERVE_check(): return PRESERVE('check')
def PRESERVE_force(): return PRESERVE('force')
def PRESERVE(modifier = 'no-replace'):
if opt.input:
for fname in opt.input:
key = '\0i:'+ abspath(fname)
existing = store.get(key,'')
if existing and modifier == 'check':
truth = (existing == tempstore[fname])
assert truth, 'PRESERVE mismatch in {} - maybe due to missed or failed RESTORE'.format(fname)
if modifier == 'force' or not existing:
store[key] = tempstore[fname]
def RESTORE():
input_ = [ (k[3:],j) for k,j in store.items() if k.startswith('\0i:') ]
filt = None if not opt.input else lambda x:x[0] in opt.input
input_ = filter(filt,input_)
for f,j in input_:
open(f,'w').write(json.dumps(j,indent=4))
global do_savefiles
do_savefiles=False
def VAR(v,do_store=False):
if do_store:
pfx,rest = v.split('*',1)
store['\0v:'+rest]=pfx
else:
return store.get('\0v:'+v,'')+v
def savefiles():
for fname,fd in fds.items():
fd = fds[fname]
fd.seek(0)
fd.write(json.dumps(tempstore[fname],indent=4))
fd.truncate()
fd.close()
def loadfile(fname):
s= ''
try:
f = open(fname,'r+')
except (IOError,OSError) as exc:
if exc.errno == errno.ENOENT:
f = open(fname,'w+')
else:
raise
s = f.read()
if not s:
j = {}
else:
j = json.loads(s,object_hook = OrderedDict)
tempstore[fname] = j
fds[fname] = f
funcs = {x:globals()[x] for x in ('PRESERVE',
'RESTORE',
'PRESERVE_check',
'PRESERVE_force' )}
def isVARitem(item): return item.startswith('VAR=')
def notVARitem(item): return not(isVARitem(item))
do_savefiles=True
def main():
if opt.input:
for s in opt.input:
loadfile(s)
for c in filter(isVARitem,opt.actions):
name,value = c.split('=',1)
VAR(value,True)
# special case - RESTORE all items in store regardless of argv input
if 'RESTORE' in opt.actions and not fds:
RESTORE()
for fname,f in fds.items():
j = tempstore[fname]
for c in filter(notVARitem,opt.actions):
name,value = c.split('=',1) if '=' in c else (c,'')
if name in funcs:
funcs[name]() # RESTORE, PRESERVE[_*] for the list of fds active
continue
if not value:
j.pop(VAR(name),None)
else:
j[VAR(name)] = ast.literal_eval(value)
if do_savefiles:
savefiles()
if __name__ == '__main__':
main()
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