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-rw-r--r--util/pubsub.lua98
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;
+};