mv neo4j_test_util.py

1 files changed, 54 insertions, 0 deletions

diff --git a/src-py_test/neo4j_test_util.py b/src-py_test/neo4j_test_util.py
new file mode 100644
index 00000000..d5aa640a
--- /dev/null
+++ b/src-py_test/neo4j_test_util.py
@@ -0,0 +1,54 @@
+import uuid
+import string
+from random import choice
+import db_controller as dbc
+
+def rand_id():
+    return str(uuid.uuid4())
+
+def rand_label(length=8):
+    """
+    return random label
+    """
+    char_set = string.ascii_lowercase + string.ascii_uppercase + string.digits
+    return ''.join([choice(string.ascii_lowercase)] + [choice(char_set) for _ in range(length - 1)])
+
+def flush_db(db_ctl):
+    """
+    complete DB flush: remove all nodes & links
+    """
+    db_ctl.exec_cypher_query('match (n) optional match (n)-[r]-() delete n,r')
+
+
+def gen_rand_data(db_ctl, lim_n=128, lim_r=256, prob_link_create = 0.3):
+    """
+    generate random DB data
+    
+    @return: tuple consisting of the random node,link labels generated
+    """
+    assert 2 <= lim_n
+
+    n_label = rand_label()
+    r_label = rand_label()
+    q_arr = ['with 0 as _', # TODO clean: foreach triggers SyntaxException: otherwise
+             'foreach (rid in range(0,%d)' % (lim_n - 1),
+             '|',
+             'create (:%s {id:rid, n_attr_0:toInt(%d * rand())}))' % (n_label, lim_n)
+            ]
+
+    q = ' '.join(q_arr)
+    op = dbc.DBO_cypher_query(q)
+    db_ctl.exec_op(op)
+
+    q_arr = ['match (s:%s),(d:%s)' % (n_label, n_label),
+             'with s,d',
+             'limit %d' % (lim_r - 1),
+             'where rand() < %.2f' % (prob_link_create),
+             'create (s)-[:%s {l_attr_0:toInt(%d * rand())}]->(d)' % (r_label,lim_r)]
+
+    q = ' '.join(q_arr)
+    op = dbc.DBO_cypher_query(q)
+    db_ctl.exec_op(op)
+
+    return (n_label, r_label)
+