diff options
Diffstat (limited to 'util/pubsub.lua')
| -rw-r--r-- | util/pubsub.lua | 98 |
1 files changed, 76 insertions, 22 deletions
diff --git a/util/pubsub.lua b/util/pubsub.lua index e1418c62..6d12690a 100644 --- a/util/pubsub.lua +++ b/util/pubsub.lua @@ -1,23 +1,27 @@ local events = require "util.events"; - -module("pubsub", package.seeall); +local t_remove = table.remove; 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) +local 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 @@ -29,13 +33,13 @@ end function service:may(node, actor, action) if actor == true then return true; end - + local node_obj = self.nodes[node]; local node_aff = node_obj and node_obj.affiliations[actor]; local service_aff = self.affiliations[actor] or self.config.get_affiliation(actor, node, action) or "none"; - + -- Check if node allows/forbids it local node_capabilities = node_obj and node_obj.capabilities; if node_capabilities then @@ -47,7 +51,7 @@ function service:may(node, actor, action) end end end - + -- Check service-wide capabilities instead local service_capabilities = self.config.capabilities; local caps = service_capabilities[node_aff or service_aff]; @@ -57,7 +61,7 @@ function service:may(node, actor, action) return can; end end - + return false; end @@ -202,7 +206,7 @@ function service:get_subscription(node, actor, jid) 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"; @@ -211,17 +215,20 @@ function service:create(node, actor) if self.nodes[node] then 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 @@ -237,10 +244,31 @@ function service:delete(node, actor) 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 @@ -258,9 +286,13 @@ function service:publish(node, actor, id, item) 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); + self.config.broadcaster("items", node, node_obj.subscribers, item, actor); return true; end @@ -271,10 +303,11 @@ function service:retract(node, actor, id, retract) 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 @@ -291,7 +324,8 @@ function service:purge(node, actor, notify) 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 @@ -309,9 +343,9 @@ function service:get_items(node, actor, id) 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 @@ -388,4 +422,24 @@ function service:set_node_capabilities(node, actor, capabilities) return true; end -return _M; +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 { + new = new; +}; |