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annotate mod_mam/fallback_archive.lib.lua @ 3772:22f02716819f

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mod_s2s_keepalive: Isolate source host of pings The incoming_s2s table is not restricted to the current virtualhost so this prevents opening more connections than what's needed. Also prevents useless double sending of one whitespace per local host.
author Kim Alvefur <zash@zash.se>
date Mon, 23 Dec 2019 01:18:02 +0100
parents 03f6d9ed2903
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
2023
98b4794b72e4 mod_mam: Include an in-memory fallback driver
Kim Alvefur <zash@zash.se>
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1 -- luacheck: ignore 212/self
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2
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3 local uuid = require "util.uuid".generate;
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4 local store = module:shared("archive");
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5 local archive_store = { _provided_by = "mam"; name = "fallback"; };
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6
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7 function archive_store:append(username, key, value, when, with)
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8 local archive = store[username];
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9 if not archive then
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10 archive = { [0] = 0 };
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11 store[username] = archive;
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12 end
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13 local index = (archive[0] or #archive)+1;
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14 local item = { key = key, when = when, with = with, value = value };
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15 if not key or archive[key] then
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16 key = uuid();
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17 item.key = key;
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18 end
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19 archive[index] = item;
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20 archive[key] = index;
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21 archive[0] = index;
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22 return key;
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23 end
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24
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25 function archive_store:find(username, query)
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26 local archive = store[username] or {};
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27 local start, stop, step = 1, archive[0] or #archive, 1;
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28 local qstart, qend, qwith = -math.huge, math.huge;
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29 local limit;
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30
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31 if query then
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32 if query.reverse then
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33 start, stop, step = stop, start, -1;
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34 if query.before and archive[query.before] then
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35 start = archive[query.before] - 1;
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36 end
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37 elseif query.after and archive[query.after] then
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38 start = archive[query.after] + 1;
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39 end
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40 qwith = query.with;
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41 limit = query.limit;
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42 qstart = query.start or qstart;
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43 qend = query["end"] or qend;
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44 end
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45
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46 return function ()
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47 if limit and limit <= 0 then return end
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48 for i = start, stop, step do
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49 local item = archive[i];
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50 if (not qwith or qwith == item.with) and item.when >= qstart and item.when <= qend then
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51 if limit then limit = limit - 1; end
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52 start = i + step; -- Start on next item
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53 return item.key, item.value, item.when, item.with;
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54 end
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55 end
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56 end
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57 end
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58
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59 function archive_store:delete(username, query)
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60 if not query or next(query) == nil then
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61 -- no specifics, delete everything
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62 store[username] = nil;
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63 return true;
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64 end
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65 local archive = store[username];
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66 if not archive then return true; end -- no messages, nothing to delete
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67
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68 local qstart = query.start or -math.huge;
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69 local qend = query["end"] or math.huge;
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70 local qwith = query.with;
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71 store[username] = nil;
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72 for i = 1, #archive do
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73 local item = archive[i];
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74 local when, with = item.when, item.when;
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75 -- Add things that don't match the query
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76 if not ((not qwith or qwith == item.with) and item.when >= qstart and item.when <= qend) then
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77 self:append(username, item.key, item.value, when, with);
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78 end
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79 end
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80 return true;
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81 end
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82
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83 return archive_store;