prosody
eca44e058eed
util/hashring.lua

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util/hashring.lua @ 13196:eca44e058eed

util.human.io: Use tail call in test to get correct line numbers This is probably not guaranteed to work and might vary with Lua version, but it's good enough for me to get accurate line numbers out of Busted that don't all point to the test() function.
author Kim Alvefur <zash@zash.se>
date Sun, 16 Jul 2023 18:42:58 +0200
parent 12975:d10957394a3c
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 local it = require "prosody.util.iterators";
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2
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3 local function generate_ring(nodes, num_replicas, hash)
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4 local new_ring = {};
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5 for _, node_name in ipairs(nodes) do
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6 for replica = 1, num_replicas do
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7 local replica_hash = hash(node_name..":"..replica);
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8 new_ring[replica_hash] = node_name;
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9 table.insert(new_ring, replica_hash);
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10 end
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11 end
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12 table.sort(new_ring);
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13 return new_ring;
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14 end
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15
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16 local hashring_methods = {};
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17 local hashring_mt = {
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18 __index = function (self, k)
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19 -- Automatically build self.ring if it's missing
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20 if k == "ring" then
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21 local ring = generate_ring(self.nodes, self.num_replicas, self.hash);
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22 rawset(self, "ring", ring);
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23 return ring;
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24 end
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25 return rawget(hashring_methods, k);
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26 end
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27 };
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28
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29 local function new(num_replicas, hash_function)
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30 return setmetatable({ nodes = {}, num_replicas = num_replicas, hash = hash_function }, hashring_mt);
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31 end;
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32
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33 function hashring_methods:add_node(name, value)
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34 self.ring = nil;
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35 self.nodes[name] = value == nil and true or value;
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36 table.insert(self.nodes, name);
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37 return true;
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38 end
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39
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40 function hashring_methods:add_nodes(nodes)
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41 self.ring = nil;
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42 local iter = pairs;
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43 if nodes[1] then -- simple array?
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44 iter = it.values;
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45 end
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46 for node_name, node_value in iter(nodes) do
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47 if self.nodes[node_name] == nil then
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48 self.nodes[node_name] = node_value == nil and true or node_value;
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49 table.insert(self.nodes, node_name);
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50 end
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51 end
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52 return true;
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53 end
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54
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55 function hashring_methods:remove_node(node_name)
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56 self.ring = nil;
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57 if self.nodes[node_name] ~= nil then
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58 for i, stored_node_name in ipairs(self.nodes) do
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59 if node_name == stored_node_name then
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60 self.nodes[node_name] = nil;
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61 table.remove(self.nodes, i);
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62 return true;
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63 end
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64 end
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65 end
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66 return false;
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67 end
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68
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69 function hashring_methods:remove_nodes(nodes)
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70 self.ring = nil;
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71 for _, node_name in ipairs(nodes) do
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72 self:remove_node(node_name);
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73 end
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74 end
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75
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76 function hashring_methods:clone()
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77 local clone_hashring = new(self.num_replicas, self.hash);
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78 for node_name, node_value in pairs(self.nodes) do
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79 clone_hashring.nodes[node_name] = node_value;
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80 end
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81 clone_hashring.ring = nil;
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82 return clone_hashring;
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83 end
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84
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85 function hashring_methods:get_node(key)
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86 local node;
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87 local key_hash = self.hash(key);
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88 for _, replica_hash in ipairs(self.ring) do
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89 if key_hash < replica_hash then
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90 node = self.ring[replica_hash];
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91 break;
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92 end
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93 end
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94 if not node then
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95 node = self.ring[self.ring[1]];
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96 end
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97 return node, self.nodes[node];
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98 end
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99
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100 return {
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101 new = new;
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102 }