prosody
d770435f0f84
util/hashring.lua

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util/hashring.lua @ 10936:d770435f0f84

util.argparse: Move exiting and error to util.startup It's not so nice to have a library that exits the entire application from under you, so this and the error reporting belongs in util.startup. The argparse code was originally in util.startup but moved out in 1196f1e8d178 but the error handling should have stayed.
author Kim Alvefur <zash@zash.se>
date Wed, 17 Jun 2020 19:32:12 +0200
parent 10005:409ff72c501c
child 11208:96429946a742
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rev   line source
10005
409ff72c501c util.hashring: Implementation of hashring data structure
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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 }