def get_nodebyname(self,nodename):
"""Get specified node from current replica group.
Parameters:
Name Type Info:
nodename str The host name of the node.
Return values:
a replicanode object of query
Exceptions:
pysequoiadb.error.SDBTypeError
pysequoiadb.error.SDBBaseError
"""
if not isintance(nodename, basestring):
raise SDBTypeError("nodename must be an instance of basestring")
try:
node = replicanode(self._client)
rc = sdb.gp_get_nodebyname(self._group, node._node, nodename)
pysequoiadb._raise_if_error("Failed to get node", rc)
except SDBBaseError:
del node
node = None
raise
return node
def get_nodebyendpoint(self, hostname, servicename):
"""Get specified node from current replica group.
Parameters:
Name Type Info:
hostname str The host name of the node.
servicename str The service name of the node.
Return values:
a replicanode object of query
Exceptions:
pysequoiadb.error.SDBBaseError
"""
if not isinstance(hostname, str_type):
raise SDBTypeError("hostname must be an instance of str_type")
if not isinstance(servicename, str_type):
raise SDBTypeError("servicename must be an instance of str_type")
node = replicanode(self._client)
try:
rc = sdb.gp_get_nodebyendpoint(self._group, node._node, hostname,
servicename)
raise_if_error(rc, "Failed to get node")
except SDBBaseError:
del node
raise
return node
def get_slave(self, *positions):
"""Get one of slave node of the current replica group, if no slave exists
then get master.
Parameters:
Name Type Info:
positions int The positions of nodes.
Return values:
a replicanode object of query
Exceptions:
pysequoiadb.error.SDBBaseError
"""
for i in range(len(positions)):
if not isinstance(positions[i], int):
raise SDBTypeError(
"elements of positions should be instance of int")
node = replicanode(self._client)
try:
rc = sdb.gp_get_slave(self._group, node._node, positions)
raise_if_error(rc, "Failed to get slave")
except SDBBaseError:
del node
raise
return node
def get_master(self):
"""Get the master node of the current replica group.
Return values:
a replica node object of query
Exceptions:
pysequoiadb.error.SDBBaseError
"""
node = replicanode(self._client)
try:
rc = sdb.gp_get_master(self._group, node._node)
raise_if_error(rc, "Failed to get master")
except SDBBaseError:
del node
raise
return node
def get_master(self):
"""Get the master node of the current replica group.
Return values:
a replicanode object of query
Exceptions:
pysequoiadb.error.SDBBaseError
"""
try:
node = replicanode(self._client)
rc = sdb.gp_get_master(self._group, node._node)
pysequoiadb._raise_if_error("Failed to get master", rc)
except SDBBaseError:
del node
node = None
raise
return node
def get_slave(self):
"""Get one of slave node of the current replica group, if no slave exists
then get master.
Return values:
a replicanode object of query
Exceptions:
pysequoiadb.error.SDBBaseError
"""
node = replicanode(self._client)
try:
rc = sdb.gp_get_slave(self._group, node._node)
raise_if_error(rc, "Failed to get slave")
except SDBBaseError:
del node
raise
return node
