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annotate mod_storage_mongodb/mod_storage_mongodb.lua @ 508:9831506dcfd6

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mod_storage_mongodb: move database connecting to inside driver:open
author James Callahan <james@chatid.com>
date Wed, 14 Dec 2011 12:56:07 +1100
parents 46f578da4ff0
children bf2ad6d6c778
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1 local next = next;
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2 local setmetatable = setmetatable;
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3
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4 local params = assert ( module:get_option("mongodb") , "mongodb configuration not found" );
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6 local mongo = require "mongo";
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8 local conn
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10 local keyval_store = {};
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11 keyval_store.__index = keyval_store;
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13 function keyval_store:get(username)
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14 local host = module.host or "_global";
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15 local store = self.store;
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17 -- The database name can't have a period in it (hence it can't be a host/ip)
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18 local namespace = params.dbname .. "." .. host;
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19 local v = { _id = { store = store ; username = username } };
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20
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21 local cursor , err = conn:query ( namespace , v );
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22 if not cursor then return nil , err end;
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23
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24 local r , err = cursor:next ( );
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25 if not r then return nil , err end;
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26 return r.data;
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27 end
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29 function keyval_store:set(username, data)
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30 local host = module.host or "_global";
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31 local store = self.store;
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33 -- The database name can't have a period in it (hence it can't be a host/ip)
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34 local namespace = params.dbname .. "." .. host;
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35 local v = { _id = { store = store ; username = username } };
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36
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37 if next(data) ~= nil then -- set data
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38 v.data = data;
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39 return conn:insert ( namespace , v );
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40 else -- delete data
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41 return conn:remove ( namespace , v );
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42 end;
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43 end
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45 local driver = { name = "mongodb" };
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47 function driver:open(store, typ)
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48 if not conn then
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49 conn = assert ( mongo.Connection.New ( true ) );
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50 assert ( conn:connect ( params.server ) );
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51 assert ( conn:auth ( params ) );
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52 end
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53
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54 if not typ then -- default key-value store
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55 return setmetatable({ store = store }, keyval_store);
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56 end;
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57 return nil, "unsupported-store";
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58 end
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60 module:add_item("data-driver", driver);