prosody
d043834f15d2
util/hashring.lua

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util/hashring.lua @ 13126:d043834f15d2

mod_http: Use RFC 7239 Forwarded header to find original client IP Prefer over X-Forwarded-* since it has an actual specification. Main practical difference is that Forwarded may carry more properties than only the IP address since it is a structured header. Since we parse it into an array, it is easier to do the logical thing and iterate backwards trough proxies until an untrusted one is encountered. Compare the handling of X-Forwarded-For. The 'secure' field now accounts for the full chain of proxies, which must be secure all the way to be considered secure.
author Kim Alvefur <zash@zash.se>
date Sat, 03 Jun 2023 17:10:04 +0200
parent 12975:d10957394a3c
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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 }