forked from Deuxfleurs/garage
120 lines
3.5 KiB
Python
120 lines
3.5 KiB
Python
import hashlib
|
|
import bisect
|
|
import xxhash
|
|
|
|
|
|
def walk_ring_from_pos(tokens, dcs, start, rep):
|
|
ret = []
|
|
ret_dcs = set()
|
|
delta = 0
|
|
while len(ret) < rep:
|
|
i = (start + delta) % len(tokens)
|
|
delta = delta + 1
|
|
|
|
(token_k, token_dc, token_node) = tokens[i]
|
|
if token_dc not in ret_dcs:
|
|
ret_dcs |= set([token_dc])
|
|
ret.append(token_node)
|
|
elif len(ret_dcs) == len(dcs) and token_node not in ret:
|
|
ret.append(token_node)
|
|
return ret
|
|
|
|
def count_tokens_per_node(tokens):
|
|
tokens_of_node = {}
|
|
for _, _, token_node in tokens:
|
|
if token_node not in tokens_of_node:
|
|
tokens_of_node[token_node] = 0
|
|
tokens_of_node[token_node] += 1
|
|
print("#tokens per node:")
|
|
for node, ntok in sorted(list(tokens_of_node.items())):
|
|
print(node, ": ", ntok)
|
|
|
|
def method1(nodes):
|
|
tokens = []
|
|
dcs = set()
|
|
for (node_id, dc, n_tokens) in nodes:
|
|
dcs |= set([dc])
|
|
for i in range(n_tokens):
|
|
token = hashlib.sha256(f"{node_id} {i}".encode('ascii')).hexdigest()
|
|
tokens.append((token, dc, node_id))
|
|
tokens.sort(key=lambda tok: tok[0])
|
|
|
|
count_tokens_per_node(tokens)
|
|
|
|
space_of_node = {}
|
|
|
|
def walk_ring(v, rep):
|
|
i = bisect.bisect_left([tok for tok, _, _ in tokens], hashlib.sha256(v).hexdigest())
|
|
return walk_ring_from_pos(tokens, dcs, i, rep)
|
|
|
|
return walk_ring
|
|
|
|
|
|
def method2(nodes):
|
|
partition_bits = 10
|
|
partitions = list(range(2**partition_bits))
|
|
def partition_node(i):
|
|
h, hn, hndc = None, None, None
|
|
for (node_id, node_dc, n_tokens) in nodes:
|
|
for tok in range(n_tokens):
|
|
#hnode = hashlib.sha256(f"{i} {node_id} {tok}".encode('ascii')).hexdigest()
|
|
xxh = xxhash.xxh64()
|
|
xxh.update(f"partition {i} node {node_id} token {tok}".encode('ascii'))
|
|
hnode = xxh.digest()
|
|
if h is None or hnode < h:
|
|
h = hnode
|
|
hn = node_id
|
|
hndc = node_dc
|
|
return (i, hndc, hn)
|
|
|
|
partition_nodes = [partition_node(i) for i in partitions]
|
|
count_tokens_per_node(partition_nodes)
|
|
|
|
dcs = list(set(node_dc for _, node_dc, _ in nodes))
|
|
|
|
|
|
def walk_ring(v, rep):
|
|
vh = hashlib.sha256(v).digest()
|
|
i = (vh[0]<<8 | vh[1]) % (2**partition_bits)
|
|
return walk_ring_from_pos(partition_nodes, dcs, i, rep)
|
|
|
|
return walk_ring
|
|
|
|
|
|
|
|
def evaluate_method(walk_ring):
|
|
node_data_counts = {}
|
|
for i in range(100000):
|
|
nodes = walk_ring(f"{i}".encode('ascii'), 3)
|
|
for n in nodes:
|
|
if n not in node_data_counts:
|
|
node_data_counts[n] = 0
|
|
node_data_counts[n] += 1
|
|
print("Number of data items per node:")
|
|
for n, v in sorted(list(node_data_counts.items())):
|
|
print(n, ": ", v)
|
|
|
|
|
|
if __name__ == "__main__":
|
|
|
|
nodes = [('digitale', 'atuin', 10),
|
|
('drosera', 'atuin', 10),
|
|
('datura', 'atuin', 10),
|
|
('io', 'jupiter', 20),
|
|
('meta', 'pipo', 10),
|
|
('mega', 'pipo', 10),
|
|
('mina', 'pipo', 10),
|
|
#('moni', 'pipo', 10),
|
|
#('mimi', 'pipo', 10),
|
|
#('mesi', 'pipo', 10),
|
|
]
|
|
|
|
print("------")
|
|
print("method 1")
|
|
method1_walk_ring = method1(nodes)
|
|
evaluate_method(method1_walk_ring)
|
|
|
|
print("------")
|
|
print("method 2")
|
|
method2_walk_ring = method2(nodes)
|
|
evaluate_method(method2_walk_ring)
|