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Copy pathparse_config.py
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executable file
·159 lines (125 loc) · 5.17 KB
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'''
@author: Frank
'''
import os
import sys
import traceback
import string
import zstacklib.utils.xmlobject as xmlobject
class TemplateError(Exception):
'''zstack template parser exception'''
class DeployConfig(object):
def __init__(self, deploy_config_path, deploy_tmpt_path=None):
self.deploy_config_path = os.path.abspath(deploy_config_path)
if deploy_tmpt_path:
self.deploy_tmpt_path = os.path.abspath(deploy_tmpt_path)
else:
self.deploy_tmpt_path = None
if not os.path.exists(deploy_config_path):
raise TemplateError('ZStack deployment Config file:%s is not found' % self.deploy_config_path)
if self.deploy_tmpt_path and not os.path.exists(self.deploy_tmpt_path):
raise TemplateError('ZStack deployment Config template file:%s is not found' % self.deploy_tmpt_path)
def _full_path(self, path):
if path.startswith('~'):
return os.path.expanduser(path)
elif path.startswith('/'):
return path
else:
return os.path.join(self.config_base_path, path)
def get_xml_config(self):
cfg_path = os.path.abspath(self.deploy_config_path)
with open(cfg_path, 'r') as fd:
xmlstr = fd.read()
fd.close()
config = xmlobject.loads(xmlstr)
return config
def get_deploy_config(self):
config = self.get_xml_config()
if self.deploy_tmpt_path:
deploy_config = build_deploy_xmlobject_from_configure(self.deploy_config_path, self.deploy_tmpt_path)
else:
deploy_config = build_deploy_xmlobject_from_configure(self.deploy_config_path)
return deploy_config
def expose_config_variable(self):
if self.deploy_config_template_path:
set_env_var_from_config_template(self.deploy_config_template_path)
def _template_to_dict(template_file_path):
def _parse(path, ret, done):
if path in done:
done.append(path)
err = "recursive import detected," \
" {0} is cyclically referenced, resolving path is: {1}".format(path, " --> ".join(done))
raise Exception(err)
done.append(path)
with open(os.path.abspath(path), 'r') as fd:
content = fd.read()
for l in content.split('\n'):
l = l.strip().strip('\t\n ')
if l == "":
continue
if l.startswith('#'):
continue
if l.startswith('import'):
_, sub_tempt = l.split(None, 1)
sub_tempt = sub_tempt.strip('''\t\n"' ''')
if sub_tempt.startswith('.'):
sub_tempt = os.path.join(os.path.dirname(os.path.abspath(path)), sub_tempt)
# allow referring to environment variable in import
if "$" in sub_tempt:
t = string.Template(sub_tempt)
sub_tempt = t.substitute(os.environ)
_parse(sub_tempt, ret, done)
continue
try:
(key, val) = l.split('=', 1)
except:
traceback.print_exc(file=sys.stdout)
err = "parse error for %s" % l
raise Exception(err)
key = key.strip()
val = val.strip()
ret[key] = val
done.remove(path)
return ret
ret = _parse(template_file_path, {}, [])
flag = True
tmp = dict(os.environ)
tmp.update(ret)
while flag:
d = ret
flag = False
for key, val in d.iteritems():
if "$" not in val:
continue
t = string.Template(val)
try:
val = t.substitute(tmp)
# the val may contain still place holder that has not been resolved
tmp[key] = val
if "$" in val:
flag = True
continue
ret[key] = val
except KeyError as e:
err = "undefined variable: {0}\ncan not parse variable: {1}," \
" it's most likely a wrong variable was defined in its value body." \
" Note, a variable is defined as 'ABC = xxx' and referenced as 'CBD = $ABC'.".format(str(e), key)
raise Exception(err)
return ret
def build_deploy_xmlobject_from_configure(xml_cfg_path, template_file_path=None):
with open(xml_cfg_path, 'r') as fd:
xmlstr = fd.read()
if template_file_path:
d = _template_to_dict(template_file_path)
tmpt = string.Template(xmlstr)
try:
xmlstr = tmpt.substitute(d)
except KeyError as key:
raise Exception("Did not find value definition in [template:] '%s' for [KEY:] '%s' from [config:] '%s' " % (
template_file_path, key, xml_cfg_path))
return xmlobject.loads(xmlstr)
def set_env_var_from_config_template(template_file_path):
if os.path.exists(template_file_path):
d = _template_to_dict(template_file_path)
for key in d:
os.environ[key] = d[key]