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openwrt-xburst/package/uci/trigger/lib/trigger.lua

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module("uci.trigger", package.seeall)
require("posix")
require("uci")
local path = "/lib/config/trigger"
local triggers = nil
local tmp_cursor = nil
function load_modules()
if triggers ~= nil then
return
end
triggers = {
list = {},
uci = {},
active = {}
}
local modules = posix.glob(path .. "/*.lua")
if modules == nil then
return
end
local oldpath = package.path
package.path = path .. "/?.lua"
for i, v in ipairs(modules) do
pcall(require(string.gsub(v, path .. "/(%w+)%.lua$", "%1")))
end
package.path = oldpath
end
function check_table(table, name)
if table[name] == nil then
table[name] = {}
end
return table[name]
end
function get_table_val(val, vtype)
if type(val) == (vtype or "string") then
return { val }
elseif type(val) == "table" then
return val
end
return nil
end
function get_name_list(name)
return get_table_val(name or ".all")
end
function add_trigger_option(list, t)
local name = get_name_list(t.option)
for i, n in ipairs(name) do
option = check_table(list, n)
table.insert(option, t)
end
end
function add_trigger_section(list, t)
local name = get_name_list(t.section)
for i, n in ipairs(name) do
section = check_table(list, n)
add_trigger_option(section, t)
end
end
function check_insert_triggers(dest, list, tuple)
if list == nil then
return
end
for i, t in ipairs(list) do
local add = true
if type(t.check) == "function" then
add = t.check(tuple)
end
if add then
dest[t.id] = t
end
end
end
function find_section_triggers(tlist, pos, tuple)
if pos == nil then
return
end
check_insert_triggers(tlist, pos[".all"], tuple)
if tuple.option then
check_insert_triggers(tlist, pos[tuple.option], tuple)
end
end
function check_recursion(name, seen)
if seen == nil then
seen = {}
end
if seen[name] then
return nil
end
seen[name] = true
return seen
end
function find_recursive_depends(list, name, seen)
seen = check_recursion(name, seen)
if not seen then
return
end
local bt = get_table_val(triggers.list[name].belongs_to) or {}
for i, n in ipairs(bt) do
table.insert(list, n)
find_recursive_depends(list, n, seen)
end
end
function check_trigger_depth(list, name)
if name == nil then
return
end
local n = list[name]
if n == nil then
return
end
list[name] = nil
return check_trigger_depth(list, n)
end
function find_triggers(tuple)
local pos = triggers.uci[tuple.package]
if pos == nil then
return {}
end
local tlist = {}
find_section_triggers(tlist, pos[".all"], tuple)
find_section_triggers(tlist, pos[tuple.section[".type"]], tuple)
for n, t in pairs(tlist) do
local dep = {}
find_recursive_depends(dep, t.id)
for i, depname in ipairs(dep) do
check_trigger_depth(tlist, depname)
end
end
local nlist = {}
for n, t in pairs(tlist) do
if t then
table.insert(nlist, t)
end
end
return nlist
end
function reset_state()
assert(io.open("/var/run/uci_trigger", "w")):close()
if tctx then
tctx:unload("uci_trigger")
end
end
function load_state()
-- make sure the config file exists before we attempt to load it
-- uci doesn't like loading nonexistent config files
local f = assert(io.open("/var/run/uci_trigger", "a")):close()
load_modules()
triggers.active = {}
if tctx then
tctx:unload("uci_trigger")
else
tctx = uci.cursor()
end
assert(tctx:load("/var/run/uci_trigger"))
tctx:foreach("uci_trigger", "trigger",
function(section)
trigger = triggers.list[section[".name"]]
if trigger == nil then
return
end
active = {}
triggers.active[trigger.id] = active
local s = get_table_val(section["sections"]) or {}
for i, v in ipairs(s) do
active[v] = true
end
end
)
end
function get_names(list)
local slist = {}
for name, val in pairs(list) do
if val then
table.insert(slist, name)
end
end
return slist
end
function check_cancel(name, seen)
local t = triggers.list[name]
local dep = get_table_val(t.belongs_to)
seen = check_recursion(name, seen)
if not t or not dep or not seen then
return false
end
for i, v in ipairs(dep) do
-- only cancel triggers for all sections
-- if both the current and the parent trigger
-- are per-section
local section_only = false
if t.section_only then
local tdep = triggers.list[v]
if tdep then
section_only = tdep.section_only
end
end
if check_cancel(v, seen) then
return true
end
if triggers.active[v] then
if section_only then
for n, active in pairs(triggers.active[v]) do
triggers.active[name][n] = false
end
else
return true
end
end
end
return false
end
-- trigger api functions
function add(ts)
for i,t in ipairs(ts) do
triggers.list[t.id] = t
match = {}
if t.package then
local package = check_table(triggers.uci, t.package)
add_trigger_section(package, t)
triggers.list[t.id] = t
end
end
end
function save_trigger(name)
if triggers.active[name] then
local slist = get_names(triggers.active[name])
if #slist > 0 then
tctx:set("uci_trigger", name, "sections", slist)
end
else
tctx:delete("uci_trigger", name)
end
end
function set(data, cursor)
assert(data ~= nil)
if cursor == nil then
cursor = tmp_cursor or uci.cursor()
tmp_cursor = uci.cursor
end
local tuple = {
package = data[1],
section = data[2],
option = data[3],
value = data[4]
}
assert(cursor:load(tuple.package))
load_state()
local section = cursor:get_all(tuple.package, tuple.section)
if (section == nil) then
if option ~= nil then
return
end
section = {
[".type"] = value
}
if tuple.section == nil then
tuple.section = ""
section[".anonymous"] = true
end
section[".name"] = tuple.section
end
tuple.section = section
local ts = find_triggers(tuple)
for i, t in ipairs(ts) do
local active = triggers.active[t.id]
if not active then
active = {}
triggers.active[t.id] = active
tctx:set("uci_trigger", t.id, "trigger")
end
if section[".name"] then
active[section[".name"]] = true
end
save_trigger(t.id)
end
tctx:save("uci_trigger")
end
function get_description(trigger, sections)
if not trigger.title then
return trigger.id
end
local desc = trigger.title
if trigger.section_only and sections and #sections > 0 then
desc = desc .. " (" .. table.concat(sections, ", ") .. ")"
end
return desc
end
function get_active()
local slist = {}
if triggers == nil then
load_state()
end
for name, val in pairs(triggers.active) do
if val and not check_cancel(name) then
local sections = {}
for name, active in pairs(triggers.active[name]) do
if active then
table.insert(sections, name)
end
end
table.insert(slist, { triggers.list[name], sections })
end
end
return slist
end
function set_active(trigger, sections)
if triggers == nil then
load_state()
end
if not triggers.list[trigger] then
return
end
if triggers.active[trigger] == nil then
tctx:set("uci_trigger", trigger, "trigger")
triggers.active[trigger] = {}
end
local active = triggers.active[trigger]
if triggers.list[trigger].section_only or sections ~= nil then
for i, t in ipairs(sections) do
triggers.active[trigger][t] = true
end
end
save_trigger(trigger)
tctx:save("uci_trigger")
end
function clear_active(trigger, sections)
if triggers == nil then
load_state()
end
if triggers.list[trigger] == nil or triggers.active[trigger] == nil then
return
end
local active = triggers.active[trigger]
if not triggers.list[trigger].section_only or sections == nil then
triggers.active[trigger] = nil
else
for i, t in ipairs(sections) do
triggers.active[trigger][t] = false
end
end
save_trigger(trigger)
tctx:save("uci_trigger")
end
function run(ts)
if ts == nil then
ts = get_active()
end
for i, t in ipairs(ts) do
local trigger = t[1]
local sections = t[2]
local actions = get_table_val(trigger.action, "function") or {}
for ai, a in ipairs(actions) do
if not trigger.section_only then
sections = { "" }
end
for si, s in ipairs(sections) do
if a(s) then
tctx:delete("uci_trigger", trigger.id)
tctx:save("uci_trigger")
end
end
end
end
end
-- helper functions
function system_command(arg)
local cmd = arg
return function(arg)
return os.execute(cmd:format(arg)) == 0
end
end
function service_restart(arg)
return system_command("/etc/init.d/" .. arg .. " restart")
end