local events = require "util.events";
+local t_remove = table.remove;
module("pubsub", package.seeall);
local service = {};
local service_mt = { __index = service };
-local default_config = {
+local default_config = { __index = {
broadcaster = function () end;
get_affiliation = function () end;
capabilities = {};
-};
+} };
+local default_node_config = { __index = {
+ ["pubsub#max_items"] = "20";
+} };
function new(config)
config = config or {};
return setmetatable({
- config = setmetatable(config, { __index = default_config });
+ config = setmetatable(config, default_config);
+ node_defaults = setmetatable(config.node_defaults or {}, default_node_config);
affiliations = {};
subscriptions = {};
nodes = {};
+ data = {};
events = events.new();
}, service_mt);
end
return true, node_obj.subscribers[jid];
end
-function service:create(node, actor)
+function service:create(node, actor, options)
-- Access checking
if not self:may(node, actor, "create") then
return false, "forbidden";
return false, "conflict";
end
+ self.data[node] = {};
self.nodes[node] = {
name = node;
subscribers = {};
- config = {};
- data = {};
+ config = setmetatable(options or {}, {__index=self.node_defaults});
affiliations = {};
};
+ setmetatable(self.nodes[node], { __index = { data = self.data[node] } }); -- COMPAT
+ self.events.fire_event("node-created", { node = node, actor = actor });
local ok, err = self:set_affiliation(node, true, actor, "owner");
if not ok then
self.nodes[node] = nil;
+ self.data[node] = nil;
end
return ok, err;
end
return false, "item-not-found";
end
self.nodes[node] = nil;
+ self.data[node] = nil;
+ self.events.fire_event("node-deleted", { node = node, actor = actor });
self.config.broadcaster("delete", node, node_obj.subscribers);
return true;
end
+local function remove_item_by_id(data, id)
+ if not data[id] then return end
+ data[id] = nil;
+ for i, _id in ipairs(data) do
+ if id == _id then
+ t_remove(data, i);
+ return i;
+ end
+ end
+end
+
+local function trim_items(data, max)
+ max = tonumber(max);
+ if not max or #data <= max then return end
+ repeat
+ data[t_remove(data, 1)] = nil;
+ until #data <= max
+end
+
function service:publish(node, actor, id, item)
-- Access checking
if not self:may(node, actor, "publish") then
end
node_obj = self.nodes[node];
end
- node_obj.data[id] = item;
+ local node_data = self.data[node];
+ remove_item_by_id(node_data, id);
+ node_data[#node_data + 1] = id;
+ node_data[id] = item;
+ trim_items(node_data, node_obj.config["pubsub#max_items"]);
self.events.fire_event("item-published", { node = node, actor = actor, id = id, item = item });
self.config.broadcaster("items", node, node_obj.subscribers, item);
return true;
end
--
local node_obj = self.nodes[node];
- if (not node_obj) or (not node_obj.data[id]) then
+ if (not node_obj) or (not self.data[node][id]) then
return false, "item-not-found";
end
- node_obj.data[id] = nil;
+ self.events.fire_event("item-retracted", { node = node, actor = actor, id = id });
+ remove_item_by_id(self.data[node], id);
if retract then
self.config.broadcaster("items", node, node_obj.subscribers, retract);
end
if not node_obj then
return false, "item-not-found";
end
- node_obj.data = {}; -- Purge
+ self.data[node] = {}; -- Purge
+ self.events.fire_event("node-purged", { node = node, actor = actor });
if notify then
self.config.broadcaster("purge", node, node_obj.subscribers);
end
return false, "item-not-found";
end
if id then -- Restrict results to a single specific item
- return true, { [id] = node_obj.data[id] };
+ return true, { id, [id] = self.data[node][id] };
else
- return true, node_obj.data;
+ return true, self.data[node];
end
end
return true;
end
+function service:set_node_config(node, actor, new_config)
+ if not self:may(node, actor, "configure") then
+ return false, "forbidden";
+ end
+
+ local node_obj = self.nodes[node];
+ if not node_obj then
+ return false, "item-not-found";
+ end
+
+ for k,v in pairs(new_config) do
+ node_obj.config[k] = v;
+ end
+ trim_items(self.data[node], node_obj.config["pubsub#max_items"]);
+
+ return true;
+end
+
return _M;