/usr/lib/python2.7/dist-packages/etcd/__init__.py is in python-etcd 0.4.3-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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from .client import Client
from .lock import Lock
_log = logging.getLogger(__name__)
# Prevent "no handler" warnings to stderr in projects that do not configure
# logging.
try:
from logging import NullHandler
except ImportError:
# Python <2.7, just define it.
class NullHandler(logging.Handler):
def emit(self, record):
pass
_log.addHandler(NullHandler())
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.
prevNode (dict): The dictionary containing previous 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
else:
# node is not a leaf
if not leaves_only:
yield self
for n in self._children:
node = EtcdResult(None, n)
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(EtcdException, self).__init__(message)
self.payload = payload
class EtcdValueError(EtcdException, ValueError):
"""
Base class for Etcd value-related errors.
"""
pass
class EtcdCompareFailed(EtcdValueError):
"""
Compare-and-swap failure
"""
pass
class EtcdClusterIdChanged(EtcdException):
"""
The etcd cluster ID changed. This may indicate the cluster was replaced
with a backup. Raised to prevent waiting on an etcd_index that was only
valid on the old cluster.
"""
pass
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 EtcdConnectionFailed(EtcdException):
"""
Connection to etcd failed.
"""
def __init__(self, message=None, payload=None, cause=None):
super(EtcdConnectionFailed, self).__init__(message=message,
payload=payload)
self.cause = cause
class EtcdInsufficientPermissions(EtcdException):
"""
Request failed because of insufficient permissions.
"""
pass
class EtcdWatchTimedOut(EtcdConnectionFailed):
"""
A watch timed out without returning a result.
"""
pass
class EtcdWatcherCleared(EtcdException):
"""
Watcher is cleared due to etcd recovery.
"""
pass
class EtcdLeaderElectionInProgress(EtcdException):
"""
Request failed due to in-progress leader election.
"""
pass
class EtcdRootReadOnly(EtcdKeyError):
"""
Operation is not valid on the root, which is read only.
"""
pass
class EtcdDirNotEmpty(EtcdValueError):
"""
Directory not empty.
"""
pass
class EtcdLockExpired(EtcdException):
"""
Our lock apparently expired while we were trying to acquire it.
"""
class EtcdError(object):
# See https://github.com/coreos/etcd/blob/master/Documentation/errorcode.md
error_exceptions = {
100: EtcdKeyNotFound,
101: EtcdCompareFailed,
102: EtcdNotFile,
# 103: Non-public: no more peers.
104: EtcdNotDir,
105: EtcdAlreadyExist,
# 106: Non-public: key is preserved.
107: EtcdRootReadOnly,
108: EtcdDirNotEmpty,
# 109: Non-public: existing peer addr.
110: EtcdInsufficientPermissions,
200: EtcdValueError,
201: EtcdValueError,
202: EtcdValueError,
203: EtcdValueError,
204: EtcdValueError,
205: EtcdValueError,
206: EtcdValueError,
207: EtcdValueError,
208: EtcdValueError,
209: EtcdValueError,
210: EtcdValueError,
# 300: Non-public: Raft internal error.
301: EtcdLeaderElectionInProgress,
400: EtcdWatcherCleared,
401: EtcdEventIndexCleared,
}
@classmethod
def handle(cls, payload):
"""
Decodes the error and throws the appropriate error message
:param payload: The decoded JSON error payload as a dict.
"""
error_code = payload.get("errorCode")
message = payload.get("message")
cause = payload.get("cause")
msg = '{} : {}'.format(message, cause)
status = payload.get("status")
# Some general status handling, as
# not all endpoints return coherent error messages
if status == 404:
error_code = 100
elif status == 401:
error_code = 110
exc = cls.error_exceptions.get(error_code, EtcdException)
if issubclass(exc, EtcdException):
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
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