prosody
4d1206ac0d41
util/hashring.lua

Find changesets by keywords by author, files, the commit message, revision number or hash, or revset expression.

Software / code / prosody

Annotate

util/hashring.lua @ 10166:4d1206ac0d41

prosodyctl: Updated the list command, to use the new directory for custom plugins
author João Duarte <jvsDuarte08@gmail.com>
date Wed, 24 Jul 2019 10:48:20 -0700
parent 10005:409ff72c501c
child 11208:96429946a742
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
10005
409ff72c501c util.hashring: Implementation of hashring data structure
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
1 local function generate_ring(nodes, num_replicas, hash)
409ff72c501c util.hashring: Implementation of hashring data structure
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
2 local new_ring = {};
409ff72c501c util.hashring: Implementation of hashring data structure
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
3 for _, node_name in ipairs(nodes) do
409ff72c501c util.hashring: Implementation of hashring data structure
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
4 for replica = 1, num_replicas do
409ff72c501c util.hashring: Implementation of hashring data structure
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
5 local replica_hash = hash(node_name..":"..replica);
409ff72c501c util.hashring: Implementation of hashring data structure
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
6 new_ring[replica_hash] = node_name;
409ff72c501c util.hashring: Implementation of hashring data structure
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
7 table.insert(new_ring, replica_hash);
409ff72c501c util.hashring: Implementation of hashring data structure
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
8 end
409ff72c501c util.hashring: Implementation of hashring data structure
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
9 end
409ff72c501c util.hashring: Implementation of hashring data structure
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
10 table.sort(new_ring);
409ff72c501c util.hashring: Implementation of hashring data structure
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
11 return new_ring;
409ff72c501c util.hashring: Implementation of hashring data structure
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
12 end
409ff72c501c util.hashring: Implementation of hashring data structure
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
13
409ff72c501c util.hashring: Implementation of hashring data structure
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
14 local hashring_methods = {};
409ff72c501c util.hashring: Implementation of hashring data structure
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
15 local hashring_mt = {
409ff72c501c util.hashring: Implementation of hashring data structure
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
16 __index = function (self, k)
409ff72c501c util.hashring: Implementation of hashring data structure
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
17 -- Automatically build self.ring if it's missing
409ff72c501c util.hashring: Implementation of hashring data structure
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
18 if k == "ring" then
409ff72c501c util.hashring: Implementation of hashring data structure
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
19 local ring = generate_ring(self.nodes, self.num_replicas, self.hash);
409ff72c501c util.hashring: Implementation of hashring data structure
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
20 rawset(self, "ring", ring);
409ff72c501c util.hashring: Implementation of hashring data structure
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
21 return ring;
409ff72c501c util.hashring: Implementation of hashring data structure
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
22 end
409ff72c501c util.hashring: Implementation of hashring data structure
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
23 return rawget(hashring_methods, k);
409ff72c501c util.hashring: Implementation of hashring data structure
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
24 end
409ff72c501c util.hashring: Implementation of hashring data structure
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
25 };
409ff72c501c util.hashring: Implementation of hashring data structure
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
26
409ff72c501c util.hashring: Implementation of hashring data structure
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
27 local function new(num_replicas, hash_function)
409ff72c501c util.hashring: Implementation of hashring data structure
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
28 return setmetatable({ nodes = {}, num_replicas = num_replicas, hash = hash_function }, hashring_mt);
409ff72c501c util.hashring: Implementation of hashring data structure
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
29 end;
409ff72c501c util.hashring: Implementation of hashring data structure
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
30
409ff72c501c util.hashring: Implementation of hashring data structure
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
31 function hashring_methods:add_node(name)
409ff72c501c util.hashring: Implementation of hashring data structure
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
32 self.ring = nil;
409ff72c501c util.hashring: Implementation of hashring data structure
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
33 self.nodes[name] = true;
409ff72c501c util.hashring: Implementation of hashring data structure
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
34 table.insert(self.nodes, name);
409ff72c501c util.hashring: Implementation of hashring data structure
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
35 return true;
409ff72c501c util.hashring: Implementation of hashring data structure
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
36 end
409ff72c501c util.hashring: Implementation of hashring data structure
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
37
409ff72c501c util.hashring: Implementation of hashring data structure
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
38 function hashring_methods:add_nodes(nodes)
409ff72c501c util.hashring: Implementation of hashring data structure
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
39 self.ring = nil;
409ff72c501c util.hashring: Implementation of hashring data structure
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
40 for _, node_name in ipairs(nodes) do
409ff72c501c util.hashring: Implementation of hashring data structure
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
41 if not self.nodes[node_name] then
409ff72c501c util.hashring: Implementation of hashring data structure
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
42 self.nodes[node_name] = true;
409ff72c501c util.hashring: Implementation of hashring data structure
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
43 table.insert(self.nodes, node_name);
409ff72c501c util.hashring: Implementation of hashring data structure
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
44 end
409ff72c501c util.hashring: Implementation of hashring data structure
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
45 end
409ff72c501c util.hashring: Implementation of hashring data structure
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
46 return true;
409ff72c501c util.hashring: Implementation of hashring data structure
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
47 end
409ff72c501c util.hashring: Implementation of hashring data structure
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
48
409ff72c501c util.hashring: Implementation of hashring data structure
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
49 function hashring_methods:remove_node(node_name)
409ff72c501c util.hashring: Implementation of hashring data structure
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
50 self.ring = nil;
409ff72c501c util.hashring: Implementation of hashring data structure
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
51 if self.nodes[node_name] then
409ff72c501c util.hashring: Implementation of hashring data structure
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
52 for i, stored_node_name in ipairs(self.nodes) do
409ff72c501c util.hashring: Implementation of hashring data structure
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
53 if node_name == stored_node_name then
409ff72c501c util.hashring: Implementation of hashring data structure
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
54 self.nodes[node_name] = nil;
409ff72c501c util.hashring: Implementation of hashring data structure
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
55 table.remove(self.nodes, i);
409ff72c501c util.hashring: Implementation of hashring data structure
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
56 return true;
409ff72c501c util.hashring: Implementation of hashring data structure
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
57 end
409ff72c501c util.hashring: Implementation of hashring data structure
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
58 end
409ff72c501c util.hashring: Implementation of hashring data structure
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
59 end
409ff72c501c util.hashring: Implementation of hashring data structure
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
60 return false;
409ff72c501c util.hashring: Implementation of hashring data structure
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
61 end
409ff72c501c util.hashring: Implementation of hashring data structure
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
62
409ff72c501c util.hashring: Implementation of hashring data structure
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
63 function hashring_methods:remove_nodes(nodes)
409ff72c501c util.hashring: Implementation of hashring data structure
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
64 self.ring = nil;
409ff72c501c util.hashring: Implementation of hashring data structure
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
65 for _, node_name in ipairs(nodes) do
409ff72c501c util.hashring: Implementation of hashring data structure
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
66 self:remove_node(node_name);
409ff72c501c util.hashring: Implementation of hashring data structure
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
67 end
409ff72c501c util.hashring: Implementation of hashring data structure
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
68 end
409ff72c501c util.hashring: Implementation of hashring data structure
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
69
409ff72c501c util.hashring: Implementation of hashring data structure
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
70 function hashring_methods:clone()
409ff72c501c util.hashring: Implementation of hashring data structure
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
71 local clone_hashring = new(self.num_replicas, self.hash);
409ff72c501c util.hashring: Implementation of hashring data structure
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
72 clone_hashring:add_nodes(self.nodes);
409ff72c501c util.hashring: Implementation of hashring data structure
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
73 return clone_hashring;
409ff72c501c util.hashring: Implementation of hashring data structure
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
74 end
409ff72c501c util.hashring: Implementation of hashring data structure
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
75
409ff72c501c util.hashring: Implementation of hashring data structure
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
76 function hashring_methods:get_node(key)
409ff72c501c util.hashring: Implementation of hashring data structure
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
77 local key_hash = self.hash(key);
409ff72c501c util.hashring: Implementation of hashring data structure
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
78 for _, replica_hash in ipairs(self.ring) do
409ff72c501c util.hashring: Implementation of hashring data structure
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
79 if key_hash < replica_hash then
409ff72c501c util.hashring: Implementation of hashring data structure
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
80 return self.ring[replica_hash];
409ff72c501c util.hashring: Implementation of hashring data structure
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
81 end
409ff72c501c util.hashring: Implementation of hashring data structure
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
82 end
409ff72c501c util.hashring: Implementation of hashring data structure
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
83 return self.ring[self.ring[1]];
409ff72c501c util.hashring: Implementation of hashring data structure
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
84 end
409ff72c501c util.hashring: Implementation of hashring data structure
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
85
409ff72c501c util.hashring: Implementation of hashring data structure
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
86 return {
409ff72c501c util.hashring: Implementation of hashring data structure
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
87 new = new;
409ff72c501c util.hashring: Implementation of hashring data structure
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
88 }