prosody
bb5f772b3189
util/hashring.lua

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util/hashring.lua @ 12520:bb5f772b3189 0.12

util.prosodyctl.check: Remove now redundant unbound config tweak This is now done in net.unbound itself Turning it back on in the config may still cause the problem of entries there masking the DNS values.
author Kim Alvefur <zash@zash.se>
date Thu, 26 May 2022 13:03:58 +0200
parent 11208:96429946a742
child 12795:87424cbedc55
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1 local function generate_ring(nodes, num_replicas, hash)
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2 local new_ring = {};
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3 for _, node_name in ipairs(nodes) do
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4 for replica = 1, num_replicas do
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5 local replica_hash = hash(node_name..":"..replica);
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6 new_ring[replica_hash] = node_name;
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7 table.insert(new_ring, replica_hash);
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8 end
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9 end
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10 table.sort(new_ring);
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11 return new_ring;
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12 end
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13
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14 local hashring_methods = {};
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15 local hashring_mt = {
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16 __index = function (self, k)
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17 -- Automatically build self.ring if it's missing
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18 if k == "ring" then
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19 local ring = generate_ring(self.nodes, self.num_replicas, self.hash);
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20 rawset(self, "ring", ring);
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21 return ring;
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22 end
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23 return rawget(hashring_methods, k);
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24 end
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25 };
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26
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27 local function new(num_replicas, hash_function)
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28 return setmetatable({ nodes = {}, num_replicas = num_replicas, hash = hash_function }, hashring_mt);
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29 end;
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30
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31 function hashring_methods:add_node(name)
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32 self.ring = nil;
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33 self.nodes[name] = true;
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34 table.insert(self.nodes, name);
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35 return true;
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36 end
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37
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38 function hashring_methods:add_nodes(nodes)
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39 self.ring = nil;
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40 for _, node_name in ipairs(nodes) do
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41 if not self.nodes[node_name] then
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42 self.nodes[node_name] = true;
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43 table.insert(self.nodes, node_name);
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44 end
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45 end
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46 return true;
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47 end
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48
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49 function hashring_methods:remove_node(node_name)
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50 self.ring = nil;
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51 if self.nodes[node_name] then
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52 for i, stored_node_name in ipairs(self.nodes) do
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53 if node_name == stored_node_name then
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54 self.nodes[node_name] = nil;
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55 table.remove(self.nodes, i);
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56 return true;
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57 end
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58 end
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59 end
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60 return false;
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61 end
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62
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63 function hashring_methods:remove_nodes(nodes)
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64 self.ring = nil;
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65 for _, node_name in ipairs(nodes) do
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66 self:remove_node(node_name);
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67 end
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68 end
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69
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70 function hashring_methods:clone()
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71 local clone_hashring = new(self.num_replicas, self.hash);
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72 clone_hashring:add_nodes(self.nodes);
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73 return clone_hashring;
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74 end
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75
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76 function hashring_methods:get_node(key)
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77 local key_hash = self.hash(key);
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78 for _, replica_hash in ipairs(self.ring) do
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79 if key_hash < replica_hash then
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80 return self.ring[replica_hash];
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81 end
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82 end
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83 return self.ring[self.ring[1]];
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84 end
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85
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86 return {
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87 new = new;
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88 }