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import collections
from .client import Client
from .lock import Lock
from .election import LeaderElection
class EtcdResult(object):
_node_props = {
'key': None,
'value': None,
'expiration': None,
'ttl': None,
'modifiedIndex': None,
'createdIndex': None,
'newKey': False,
'dir': False,
}
def __init__(self, action=None, node=None, prevNode=None, **kwdargs):
"""
Creates an EtcdResult object.
Args:
action (str): The action that resulted in key creation
node (dict): The dictionary containing all node information.
"""
self.action = action
for (key, default) in self._node_props.items():
if key in node:
setattr(self, key, node[key])
else:
setattr(self, key, default)
self._children = []
if self.dir and 'nodes' in node:
# We keep the data in raw format, converting them only when needed
self._children = node['nodes']
if prevNode:
self._prev_node = EtcdResult(None, node=prevNode)
# See issue 38: when returning a write() op etcd has a bogus result.
if self._prev_node.dir and not self.dir:
self.dir = True
def parse_headers(self, response):
headers = response.getheaders()
self.etcd_index = int(headers.get('x-etcd-index', 1))
self.raft_index = int(headers.get('x-raft-index', 1))
def get_subtree(self, leaves_only=False):
"""
Get all the subtree resulting from a recursive=true call to etcd.
Args:
leaves_only (bool): if true, only value nodes are returned
"""
if not self._children:
#if the current result is a leaf, return itself
yield self
return
for n in self._children:
node = EtcdResult(None, n)
if not leaves_only:
#Return also dirs, not just value nodes
yield node
for child in node.get_subtree(leaves_only=leaves_only):
yield child
return
@property
def leaves(self):
return self.get_subtree(leaves_only=True)
@property
def children(self):
""" Deprecated, use EtcdResult.leaves instead """
return self.leaves
def __eq__(self, other):
if not (type(self) is type(other)):
return False
for k in self._node_props.keys():
try:
a = getattr(self, k)
b = getattr(other, k)
if a != b:
return False
except:
return False
return True
def __ne__(self, other):
return not self.__eq__(other)
def __repr__(self):
return "%s(%r)" % (self.__class__, self.__dict__)
class EtcdException(Exception):
"""
Generic Etcd Exception.
"""
def __init__(self, message=None, payload=None):
super(Exception, self).__init__(message)
self.payload=payload
class EtcdKeyError(EtcdException):
"""
Etcd Generic KeyError Exception
"""
pass
class EtcdKeyNotFound(EtcdKeyError):
"""
Etcd key not found exception (100)
"""
pass
class EtcdNotFile(EtcdKeyError):
"""
Etcd not a file exception (102)
"""
pass
class EtcdNotDir(EtcdKeyError):
"""
Etcd not a directory exception (104)
"""
pass
class EtcdAlreadyExist(EtcdKeyError):
"""
Etcd already exist exception (105)
"""
pass
class EtcdEventIndexCleared(EtcdException):
"""
Etcd event index is outdated and cleared exception (401)
"""
pass
class EtcdError(object):
# See https://github.com/coreos/etcd/blob/master/Documentation/errorcode.md
error_exceptions = {
100: EtcdKeyNotFound,
101: ValueError,
102: EtcdNotFile,
103: Exception,
104: EtcdNotDir,
105: EtcdAlreadyExist,
106: KeyError,
200: ValueError,
201: ValueError,
202: ValueError,
203: ValueError,
300: Exception,
301: Exception,
400: Exception,
401: EtcdEventIndexCleared,
500: EtcdException
}
@classmethod
def handle(cls, errorCode=None, message=None, cause=None, **kwdargs):
""" Decodes the error and throws the appropriate error message"""
try:
msg = '{} : {}'.format(message, cause)
payload={'errorCode': errorCode, 'message': message, 'cause': cause}
print("============================")
print(payload)
print("length: {}".format(len(kwdargs)))
if len(kwdargs) > 0:
for key in kwdargs:
print("{}={}".format(key, kwdargs[key]))
payload[key]=kwdargs[key]
exc = cls.error_exceptions[errorCode]
except:
msg = "Unable to decode server response"
exc = EtcdException
if exc in [EtcdException, EtcdKeyNotFound, EtcdNotFile, EtcdNotDir, EtcdAlreadyExist, EtcdEventIndexCleared]:
raise exc(msg, payload)
else:
raise exc(msg)
# Attempt to enable urllib3's SNI support, if possible
# Blatantly copied from requests.
try:
from urllib3.contrib import pyopenssl
pyopenssl.inject_into_urllib3()
except ImportError:
pass
|
