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GetSubgraph.py
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GetSubgraph.py
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# --coding:utf-8--
#
# Copyright (c) 2019 vesoft inc. All rights reserved.
#
# This source code is licensed under Apache 2.0 License,
# attached with Common Clause Condition 1.0, found in the LICENSES directory.
"""
Nebula Client example.
"""
import sys
import time
import concurrent.futures
import traceback
from concurrent.futures import ThreadPoolExecutor
from nebula.graph import ttypes
from nebula.ConnectionPool import ConnectionPool
from nebula.Client import GraphClient, ExecutionException
def add_src_dst(resp):
vertex_list = set()
src_dst_list = []
if resp.rows is None:
print('rows is empty')
return True, {}, []
for row in resp.rows:
src_dst = []
for col in row.columns:
if col.getType() != ttypes.ColumnValue.ID:
print('ERROR: type is wrong')
return False, {}, []
src_dst.append(col.get_id())
vertex_list.add(col.get_id())
src_dst_list.append(src_dst)
return True, vertex_list, src_dst_list
def get_edge(client, edge, id_str, reversely):
cmd = ''
if reversely:
cmd = 'GO FROM ' + id_str + ' OVER ' + edge + ' REVERSELY ' + \
' YIELD ' + edge + '._src AS src, ' + edge + '._dst AS dst'
else:
cmd = 'GO FROM ' + id_str + ' OVER ' + edge + \
' YIELD ' + edge + '._src AS src, ' + edge + '._dst AS dst'
# print(cmd)
resp = client.execute_query(cmd)
ret, vertex_list, src_dst = add_src_dst(resp)
return ret, edge, vertex_list, src_dst
def get_srcId_dstId(clients, id_list, edge_list):
edge_src_dst = {}
vertex_list = set()
if len(id_list) == 0:
return True, {}, {}
reqs = []
for edge in edge_list:
id_str = ''
for vid in id_list:
id_str = id_str + str(vid) + ','
if len(id_str) != 0:
id_str = id_str[:-1]
reqs.append([edge, id_str, False])
reqs.append([edge, id_str, True])
num = len(reqs)
with concurrent.futures.ThreadPoolExecutor(num) as executor:
to_do = []
for i, req in zip(range(0, num),reqs):
future = executor.submit(get_edge, clients[i], req[0], req[1], req[2])
to_do.append(future)
# future.add_done_callback(over)
for future in concurrent.futures.as_completed(to_do):
if future.exception() is not None:
print(future.exception())
return False, {}, []
else:
ret, edge, vertex, src_dst = future.result()
if not ret:
continue
vertex_list.update(vertex)
if edge in edge_src_dst:
edge_src_dst[edge] = edge_src_dst[edge] + src_dst
else:
edge_src_dst[edge] = src_dst
return True, edge_src_dst, vertex_list
def get_vertex_props(client, id_str, tag_name):
cmd = 'FETCH PROP ON ' + tag_name + ' ' + id_str
# print(cmd)
return client.execute_query(cmd)
def fetch_vertex(clients, id_list, tag_list):
if len(clients) == 0:
return False, True, {}
if len(id_list) == 0 or len(tag_list) == 0:
return False, True, {}
id_str = ''
for vid in id_list:
id_str = id_str + str(vid) + ','
id_str = id_str[:-1]
reqs = []
for tag in tag_list:
reqs.append([id_str, tag])
num = len(reqs)
vertexes_list = {}
with concurrent.futures.ThreadPoolExecutor(num) as executor:
to_do = []
for i, req in zip(range(0, num),reqs):
future = executor.submit(get_vertex_props, clients[i], req[0], req[1])
to_do.append(future)
for future, req in zip(concurrent.futures.as_completed(to_do), reqs):
if future.exception() is not None:
print(future.exception())
continue
else:
resp = future.result()
if resp.error_code:
print('Execute failed: %s' % resp.error_msg)
continue
if not resp.rows:
continue
for row in resp.rows:
if len(resp.column_names) != len(row.columns):
continue
vid = row.columns[0].get_id()
name_value_list = {}
for name, col in zip(resp.column_names[1:], row.columns[1:]):
if col.getType() == ttypes.ColumnValue.__EMPTY__:
print('ERROR: type is empty')
return False, True, {}
elif col.getType() == ttypes.ColumnValue.BOOL_VAL:
name_value_list[name] = col.get_bool_val()
elif col.getType() == ttypes.ColumnValue.INTEGER:
name_value_list[name] = col.get_integer()
elif col.getType() == ttypes.ColumnValue.ID:
continue
elif col.getType() == ttypes.ColumnValue.STR:
name_value_list[name] = col.get_str().decode('utf-8')
elif col.getType() == ttypes.ColumnValue.DOUBLE_PRECISION:
name_value_list[name] = col.get_double_precision()
elif col.getType() == ttypes.ColumnValue.TIMESTAMP:
name_value_list[name] = col.get_timestamp()
else:
print('ERROR: Type unsupported')
return False, True, {}
if len(name_value_list) == 0:
continue
vertexes_list[vid] = name_value_list
return True, True, vertexes_list
def get_edge_props(client, id_str, edge_name):
cmd = 'FETCH PROP ON ' + edge_name + ' ' + id_str
# print(cmd)
resp = client.execute_query(cmd)
return edge_name, resp
def fetch_edges(clients, edge_src_dst_list):
if len(edge_src_dst_list) == 0:
return False, False, {}
edges_list = {}
reqs = []
for edge_name in edge_src_dst_list:
src_dst_list = edge_src_dst_list[edge_name]
id_str = ''
for edge in src_dst_list:
id_str += str(edge[0]) + '->' + str(edge[1]) + ','
if len(id_str) > 0:
id_str = id_str[:-1]
if len(id_str) == 0:
continue
reqs.append([id_str, edge_name])
num = len(reqs)
resps = {}
with concurrent.futures.ThreadPoolExecutor(num) as executor:
to_do = []
for i, req in zip(range(0, num), reqs):
future = executor.submit(get_edge_props, clients[i], req[0], req[1])
to_do.append(future)
for future, req in zip(concurrent.futures.as_completed(to_do), reqs):
if future.exception() is not None:
print(future.exception())
continue
else:
edge_name, resp = future.result()
if resp.error_code:
print('Execute failed: %s' % resps[name].error_msg)
exit(1)
for row in resp.rows:
name_value_list = {}
src_id = row.columns[0].get_id()
dst_id = row.columns[1].get_id()
for name, col in zip(resp.column_names[3:], row.columns[3:]):
if col.getType() == ttypes.ColumnValue.__EMPTY__:
print('ERROR: type is empty')
return False, False, {}
elif col.getType() == ttypes.ColumnValue.BOOL_VAL:
name_value_list[name] = col.get_bool_val()
elif col.getType() == ttypes.ColumnValue.INTEGER:
name_value_list[name] = col.get_integer()
elif col.getType() == ttypes.ColumnValue.ID:
name_value_list[name] = name, col.get_id()
elif col.getType() == ttypes.ColumnValue.STR:
name_value_list[name] = col.get_str().decode('utf-8')
elif col.getType() == ttypes.ColumnValue.DOUBLE_PRECISION:
name_value_list[name] = col.get_double_precision()
elif col.getType() == ttypes.ColumnValue.TIMESTAMP:
name_value_list[name] = col.get_timestamp()
else:
print('ERROR: Type unsupported')
return False, False, {}
edge_key = (edge_name, src_id, dst_id)
edges_list[edge_key] = name_value_list
return True, False, edges_list
"""get_subgraph: get all vertices and edges and all of their properties in the subgraph
Arguments:
- client: the graph client
- id: the start vid
- steps: want to go n steps
- tag_list: all tag name in space
- edge_name_list: all edge name in space
Returns:
- result: True or False
- vertices: all vertices in subgraph
- edges: all edges in subgraph
"""
def get_subgraph(clients, id, steps, tag_list, edge_name_list):
print('input id: %d, steps: %d' % (id, steps))
edge_list = {}
vertex_list = set([id])
vertices = {}
id_list = [id]
for i in range(1, steps+1):
# start_time = time.time()
ret, edges, vertices = get_srcId_dstId(clients, id_list, edge_name_list)
if not ret:
print('Get subgraph failed')
return False, {}, {}
id_list = vertices
edge_list.update(edges)
vertex_list.update(vertices)
# end_time = time.time()
# print('step {} cost {} seconds'.format(i, end_time - start_time))
# Gets the relationship between the outermost points
if vertices:
# start_time = time.time()
result, end_edges, end_vertices = get_srcId_dstId(clients, vertices, edge_name_list)
if not result:
print('Get subgraph failed')
return False, {}, {}
if len(end_edges) != 0:
for edge_name in end_edges:
for edge in end_edges[edge_name]:
if edge[0] in vertices and edge[1] in vertices:
# print('Gets the outermost relation %d -> %d' % (edge[0],edge[1]))
edge_list[edge_name].append(edge)
# end_time = time.time()
# print('step {} cost {} seconds'.format(steps+1, end_time - start_time))
# distinct
for edge in edge_list:
temp = []
for item in edge_list[edge]:
if item not in temp:
temp.append(item)
edge_list[edge] = temp
# start_time = time.time()
client_num = len(clients)
mid = client_num/2
with concurrent.futures.ThreadPoolExecutor(3) as executor:
to_do = []
v_future = executor.submit(fetch_vertex, clients[0:int(mid)], vertex_list, tag_list)
e_future = executor.submit(fetch_edges, clients[int(mid):int(client_num)], edge_list)
to_do.append(v_future)
to_do.append(e_future)
for future in concurrent.futures.as_completed(to_do):
if future.exception() is not None:
print(future.exception())
continue
else:
ret, is_vertex,resp = future.result()
if not ret:
continue
if is_vertex:
vertices = resp
else:
edges = resp
# end_time = time.time()
# print('fetch props cost {} seconds'.format(end_time - start_time))
return True, vertices, edges
if __name__ == '__main__':
try:
g_ip = '127.0.0.1'
g_port = 3699
print('input argv num is %d' % len(sys.argv))
if len(sys.argv) == 3:
print('input argv num is 3')
g_ip = sys.argv[1]
print('ip: %s' % g_ip)
g_port = sys.argv[2]
print('port: %s' % g_port)
# init connection pool
# if your tags or edges' num is more than 10,
# please make sure conn_num >= max(tags_num, edges_num) * 2
conn_num = 20
connection_pool = ConnectionPool(g_ip, g_port, conn_num)
clients = []
for i in range(0, conn_num):
client = GraphClient(connection_pool)
client.authenticate('user', 'password')
client.execute('USE test')
clients.append(client)
# Get client
resp = clients[0].execute_query('SHOW TAGS')
if resp.error_code:
raise ExecutionException('SHOW TAGS failed')
tag_list = []
for row in resp.rows:
tag_list.append(row.columns[1].get_str().decode('utf-8'))
resp = clients[0].execute_query('SHOW EDGES')
if resp.error_code:
raise ExecutionException('SHOW EDGES failed')
edge_list = []
for row in resp.rows:
edge_list.append(row.columns[1].get_str().decode('utf-8'))
start_time = time.time()
vid = 100
result, all_vertices, all_edges = get_subgraph(clients, vid, 2, tag_list, edge_list)
end_time = time.time()
print('cost {} seconds'.format(end_time - start_time))
print('=========== vertices ===========, num: %d' % len(all_vertices))
print(all_vertices)
print('============= edges ============, num: %d' % len(all_edges))
print(all_edges)
connection_pool.close()
except Exception as x:
print(x)
print('============ traceback =============')
traceback.print_exc()