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try:
import ConfigParser
except ImportError:
# py 3
import configparser as ConfigParser
import re
from string import Template
from syncdutils import escape, unescape, norm, update_file, GsyncdError
SECT_ORD = '__section_order__'
SECT_META = '__meta__'
config_version = 2.0
re_type = type(re.compile(''))
class MultiDict(object):
"""a virtual dict-like class which functions as the union of underlying dicts"""
def __init__(self, *dd):
self.dicts = dd
def __getitem__(self, key):
val = None
for d in self.dicts:
if d.get(key):
val = d[key]
if not val:
raise KeyError(key)
return val
class GConffile(object):
"""A high-level interface to ConfigParser which flattens the two-tiered
config layout by implenting automatic section dispatch based on initial
parameters.
Also ensure section ordering in terms of their time of addition -- a compat
hack for Python < 2.7.
"""
def _normconfig(self):
"""normalize config keys by s/-/_/g"""
for n, s in self.config._sections.items():
if n.find('__') == 0:
continue
s2 = type(s)()
for k, v in s.items():
if k.find('__') != 0:
k = norm(k)
s2[k] = v
self.config._sections[n] = s2
def __init__(self, path, peers, *dd):
"""
- .path: location of config file
- .config: underlying ConfigParser instance
- .peers: on behalf of whom we flatten .config
(master, or master-slave url pair)
- .auxdicts: template subtituents
"""
self.peers = peers
self.path = path
self.auxdicts = dd
self.config = ConfigParser.RawConfigParser()
self.config.read(path)
self._normconfig()
def section(self, rx=False):
"""get the section name of the section representing .peers in .config"""
peers = self.peers
if not peers:
peers = ['.', '.']
rx = True
if rx:
st = 'peersrx'
else:
st = 'peers'
return ' '.join([st] + [escape(u) for u in peers])
@staticmethod
def parse_section(section):
"""retrieve peers sequence encoded by section name
(as urls or regexen, depending on section type)
"""
sl = section.split()
st = sl.pop(0)
sl = [unescape(u) for u in sl]
if st == 'peersrx':
sl = [re.compile(u) for u in sl]
return sl
def ord_sections(self):
"""Return an ordered list of sections.
Ordering happens based on the auxiliary
SECT_ORD section storing indices for each
section added through the config API.
To not to go corrupt in case of manually
written config files, we take care to append
also those sections which are not registered
in SECT_ORD.
Needed for python 2.{4,5,6} where ConfigParser
cannot yet order sections/options internally.
"""
so = {}
if self.config.has_section(SECT_ORD):
so = self.config._sections[SECT_ORD]
so2 = {}
for k, v in so.items():
if k != '__name__':
so2[k] = int(v)
tv = 0
if so2:
tv = max(so2.values()) + 1
ss = [s for s in self.config.sections() if s.find('__') != 0]
for s in ss:
if s in so.keys():
continue
so2[s] = tv
tv += 1
def scmp(x, y):
return cmp(*(so2[s] for s in (x, y)))
ss.sort(scmp)
return ss
def update_to(self, dct, allow_unresolved=False):
"""update @dct from key/values of ours.
key/values are collected from .config by filtering the regexp sections
according to match, and from .section. The values are treated as templates,
which are substituted from .auxdicts and (in case of regexp sections)
match groups.
"""
if not self.peers:
raise GsyncdError('no peers given, cannot select matching options')
def update_from_sect(sect, mud):
for k, v in self.config._sections[sect].items():
if k == '__name__':
continue
if allow_unresolved:
dct[k] = Template(v).safe_substitute(mud)
else:
dct[k] = Template(v).substitute(mud)
for sect in self.ord_sections():
sp = self.parse_section(sect)
if isinstance(sp[0], re_type) and len(sp) == len(self.peers):
match = True
mad = {}
for i in range(len(sp)):
m = sp[i].search(self.peers[i])
if not m:
match = False
break
for j in range(len(m.groups())):
mad['match%d_%d' % (i+1, j+1)] = m.groups()[j]
if match:
update_from_sect(sect, MultiDict(dct, mad, *self.auxdicts))
if self.config.has_section(self.section()):
update_from_sect(self.section(), MultiDict(dct, *self.auxdicts))
def get(self, opt=None):
"""print the matching key/value pairs from .config,
or if @opt given, the value for @opt (according to the
logic described in .update_to)
"""
d = {}
self.update_to(d, allow_unresolved = True)
if opt:
opt = norm(opt)
v = d.get(opt)
if v:
print(v)
else:
for k, v in d.iteritems():
if k == '__name__':
continue
print("%s: %s" % (k, v))
def write(self, trfn, opt, *a, **kw):
"""update on-disk config transactionally
@trfn is the transaction function
"""
def mergeconf(f):
self.config = ConfigParser.RawConfigParser()
self.config.readfp(f)
self._normconfig()
if not self.config.has_section(SECT_META):
self.config.add_section(SECT_META)
self.config.set(SECT_META, 'version', config_version)
return trfn(norm(opt), *a, **kw)
def updateconf(f):
self.config.write(f)
update_file(self.path, updateconf, mergeconf)
def _set(self, opt, val, rx=False):
"""set @opt to @val in .section"""
sect = self.section(rx)
if not self.config.has_section(sect):
self.config.add_section(sect)
# regarding SECT_ORD, cf. ord_sections
if not self.config.has_section(SECT_ORD):
self.config.add_section(SECT_ORD)
self.config.set(SECT_ORD, sect, len(self.config._sections[SECT_ORD]))
self.config.set(sect, opt, val)
return True
def set(self, opt, *a, **kw):
"""perform ._set transactionally"""
self.write(self._set, opt, *a, **kw)
def _delete(self, opt, rx=False):
"""delete @opt from .section"""
sect = self.section(rx)
if self.config.has_section(sect):
return self.config.remove_option(sect, opt)
def delete(self, opt, *a, **kw):
"""perform ._delete transactionally"""
self.write(self._delete, opt, *a, **kw)
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