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"""
Rhizi kernel, home to core operation login
"""
import json
import logging
import traceback
from db_op import DBO_diff_commit__attr, DBO_block_chain__commit, DBO_rzdoc__create, \
DBO_rzdoc__lookup_by_name, DBO_rzdoc__clone, DBO_rzdoc__delete, DBO_rzdoc__list,\
DBO_block_chain__init
from db_op import DBO_diff_commit__topo
from model.graph import Topo_Diff
from model.model import RZDoc
import neo4j_util
from neo4j_qt import QT_RZDOC_NS_Filter, QT_RZDOC_Meta_NS_Filter
log = logging.getLogger('rhizi')
class RZDoc_Exception__not_found(Exception):
def __init__(self, rzdoc_name):
super(RZDoc_Exception__not_found, self).__init__('rzdoc not found: \'%s\'' % (rzdoc_name))
class RZDoc_Exception__already_exists(Exception):
def __init__(self, rzdoc_name):
super(RZDoc_Exception__already_exists, self).__init__('rzdoc already exists: \'%s\'' % (rzdoc_name))
class RZDoc_Reader_Association:
"""
RZDoc reader association used to map rzdoc's to update subscribing readers.
Note: the term reader is used to represent a party performing R/W operations
"""
def __init__(self):
self.remote_socket_addr = None # (addr, port)
self.rzdoc = None
self.socket = None
self.err_count__IO = 0 # allow n IO errors before disconnecting reader
self.mark__expired = False
def __eq__(self, other):
if not isinstance(other, RZDoc_Reader_Association): return False
return self.socket == other.socket
def __str__(self):
return '%s: remote addr: %s:%s' % (self.rzdoc, self.remote_socket_addr[0], self.remote_socket_addr[1])
def deco__exception_log(kernel_f):
"""
Exception logger function decorator
"""
@wraps(kernel_f)
def f_decorated(self, *args, **kwargs):
try:
ret = kernel_f(self, *args, **kwargs)
return ret
except Exception as e:
log.error(e.message)
log.error(traceback.print_exc())
raise e
return f_decorated
def for_all_public_functions(decorator):
def cls_decorated(cls):
for attr in cls.__dict__:
if callable(getattr(cls, attr)) and not attr.startswith('_'):
setattr(cls, attr, decorator(getattr(cls, attr)))
return cls
return cls_decorated
@for_all_public_functions(deco__exception_log)
class RZ_Kernel(object):
"""
RZ kernel:
- all public methods decorated with deco__exception_log
"""
def __init__(self):
self.db_ctl = None
self.rzdoc_reader_assoc_map = defaultdict(list)
self.cache__rzdoc_name_to_rzdoc = {}
def cache_lookup__rzdoc(self, rzdoc_name):
"""
lookup RZDoc by rzdoc_name, possibly triggering a DB query
@raise RZDoc_Exception__not_found
"""
# FIXME: impl cache cleansing logic
cache_doc = self.cache__rzdoc_name_to_rzdoc.get(rzdoc_name)
if None != cache_doc:
return cache_doc
rz_doc = self.rzdoc__lookup_by_name(rzdoc_name)
if None == rz_doc:
raise RZDoc_Exception__not_found(rzdoc_name)
self.cache__rzdoc_name_to_rzdoc[rzdoc_name] = rz_doc
return rz_doc
def diff_commit__topo(self, topo_diff, ctx=None):
"""
commit a graph topology diff - this is a common pathway for:
- RESP API calls
- socket.io calls
- future interfaces
@return: a tuple containing the input diff and the result of it's commit
"""
rzdoc = ctx.rzdoc
op = DBO_diff_commit__topo(topo_diff)
op = QT_RZDOC_NS_Filter(rzdoc)(op)
op_ret = self.db_ctl.exec_op(op)
self.exec_chain_commit_op(topo_diff, ctx)
return topo_diff, op_ret
def diff_commit__attr(self, attr_diff, ctx=None):
"""
commit a graph attribute diff - this is a common pathway for:
- RESP API calls
- socket.io calls
- future interfaces
@return: a tuple containing the input diff and the result of it's commit
"""
rzdoc = ctx.rzdoc
op = DBO_diff_commit__attr(attr_diff)
op = QT_RZDOC_NS_Filter(rzdoc)(op)
op_ret = self.db_ctl.exec_op(op)
self.exec_chain_commit_op(attr_diff, ctx)
return attr_diff, op_ret
def exec_chain_commit_op(self, diff_obj, ctx):
# FIXME: clean
if isinstance(diff_obj, Topo_Diff):
commit_obj = diff_obj.to_json_dict()
else:
commit_obj = diff_obj
rzdoc = ctx.rzdoc
op = DBO_block_chain__commit(commit_obj, ctx)
op = QT_RZDOC_Meta_NS_Filter(rzdoc)(op)
self.db_ctl.exec_op(op)
def rzdoc__clone(self, rzdoc, ctx=None):
"""
Clone entire rzdoc
@return Topo_Diff with node/link attributes
"""
op = DBO_rzdoc__clone()
op = QT_RZDOC_NS_Filter(rzdoc)(op)
topo_diff = self.db_ctl.exec_op(op)
return topo_diff
def rzdoc__lookup_by_name(self, rzdoc_name, ctx=None):
"""
@param ctx: may be None
@return: RZDoc object or None if rzdoc was not found
"""
op = DBO_rzdoc__lookup_by_name(rzdoc_name)
rzdoc = self.db_ctl.exec_op(op)
return rzdoc # may be None
def rzdoc__create(self, rzdoc_name, ctx=None):
"""
Create & persist new RZDoc - may fail on unique name/id constraint violation
@return: RZDoc object
@raise RZDoc_Exception__already_exists
"""
try:
self.cache_lookup__rzdoc(rzdoc_name)
raise RZDoc_Exception__already_exists(rzdoc_name)
except RZDoc_Exception__not_found:
pass
rzdoc = RZDoc(rzdoc_name)
rzdoc.id = neo4j_util.generate_random_rzdoc_id()
op__rzdoc__create = DBO_rzdoc__create(rzdoc)
op__block_chain__init = DBO_block_chain__init(rzdoc)
self.db_ctl.exec_op(op__rzdoc__create)
self.db_ctl.exec_op(op__block_chain__init)
return rzdoc
def rzdoc__delete(self, rzdoc, ctx=None):
"""
Delete RZDoc
@return: RZDoc object
"""
op = DBO_rzdoc__delete(rzdoc)
self.db_ctl.exec_op(op)
# TODO: broadcast delete event, clear cache mapping entry
def rzdoc__list(self, rzdoc, ctx=None):
"""
List available RZDocs
@return: RZDoc object
"""
op = DBO_rzdoc__list()
op_ret = self.db_ctl.exec_op(op)
return op_ret;
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