Implement getting the cluster nodes list from nodes

doc/api/class-mesh-connection.rst

@@ -0,0 +1,8 @@
+
+.. currentmodule:: tarantool.mesh_connection
+
+class :class:`MeshConnection`
+-----------------------------
+
+.. autoclass:: MeshConnection
+

doc/index.rst

@@ -40,6 +40,7 @@ API Reference
 
    api/module-tarantool.rst
    api/class-connection.rst
+   api/class-mesh-connection.rst
    api/class-space.rst
    api/class-response.rst
 

doc/index.ru.rst

@@ -40,6 +40,7 @@
 
    api/module-tarantool.rst
    api/class-connection.rst
+   api/class-mesh-connection.rst
    api/class-space.rst
    api/class-response.rst
 

tarantool/const.py

@@ -86,3 +86,5 @@
 RECONNECT_MAX_ATTEMPTS = 10
 # Default delay between attempts to reconnect (seconds)
 RECONNECT_DELAY = 0.1
+# Default cluster nodes list refresh interval (seconds)
+CLUSTER_DISCOVERY_DELAY = 60

tarantool/error.py

@@ -43,6 +43,12 @@ class InterfaceError(Error):
     '''
 
 
+class ConfigurationError(Error):
+    '''
+    Error of initialization with a user-provided configuration.
+    '''
+
+
 # Monkey patch os.strerror for win32
 if sys.platform == "win32":
     # Windows Sockets Error Codes (not all, but related on network errors)
@@ -152,6 +158,11 @@ class NetworkWarning(UserWarning):
     pass
 
 
+class ClusterDiscoveryWarning(UserWarning):
+    '''Warning related to cluster discovery'''
+    pass
+
+
 # always print this warnings
 warnings.filterwarnings("always", category=NetworkWarning)
 
@@ -166,6 +177,7 @@ def warn(message, warning_class):
     line_no = frame.f_lineno
     warnings.warn_explicit(message, warning_class, module_name, line_no)
 
+
 _strerror = {
     0: ("ER_UNKNOWN", "Unknown error"),
     1: ("ER_ILLEGAL_PARAMS", "Illegal parameters, %s"),