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annotate mod_mam/rsm.lib.lua @ 701:cc5805f83583

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mod_mam: Implement support for Result Set Management in queries.
author Kim Alvefur <zash@zash.se>
date Fri, 08 Jun 2012 03:13:31 +0200
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children d94ee0848b27
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701
cc5805f83583 mod_mam: Implement support for Result Set Management in queries.
Kim Alvefur <zash@zash.se>
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1 local stanza = require"util.stanza".stanza;
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2 local tostring, tonumber = tostring, tonumber;
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3 local type = type;
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4 local pairs = pairs;
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5
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6 local xmlns_rsm = 'http://jabber.org/protocol/rsm';
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7
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8 local element_parsers;
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9
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10 do
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11 local function xs_int(st)
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12 return tonumber(st:get_text());
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13 end
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14 local function xs_string(st)
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15 return st:get_text();
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16 end
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17
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18 element_parsers = {
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19 after = xs_string;
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20 before = function(st)
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21 return st:get_text() or true;
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22 end;
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23 max = xs_int;
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24 index = xs_int;
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25
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26 first = function(st)
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27 return { index = tonumber(st.attr.index); st:get_text() };
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28 end;
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29 last = xs_string;
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30 count = xs_int;
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31 }
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32 end
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33
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34 local element_generators = setmetatable({
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35 first = function(st, data)
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36 if type(data) == "table" then
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37 st:tag("first", { index = data.index }):text(data[1]):up();
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38 else
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39 st:tag("first"):text(tostring(data)):up();
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40 end
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41 end;
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42 }, {
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43 __index = function(_, name)
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44 return function(st, data)
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45 st:tag(name):text(tostring(data)):up();
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46 end
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47 end;
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48 });
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49
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50
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51 local function parse(stanza)
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52 local rs = {};
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53 for tag in stanza:childtags() do
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54 local name = tag.name;
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55 local parser = name and element_parsers[name];
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56 if parser then
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57 rs[name] = parser(tag);
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58 end
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59 end
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60 return rs;
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61 end
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62
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63 local function generate(t)
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64 local st = stanza("rsm", { xmlns = xmlns_rsm });
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65 for k,v in pairs(t) do
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66 if element_parsers[k] then
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67 element_generators[k](st, v);
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68 end
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69 end
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70 return st;
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71 end
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72
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73 local function get(st)
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74 local set = st:get_child("set", xmlns_rsm);
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75 if set and #set.tags > 0 then
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76 return parse(set);
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77 else
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78 module:log("debug", "RSM parse failed, %s", tostring(st));
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79 end
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80 end
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81
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82 return { parse = parse, generate = generate, get = get };