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app.lua
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app.lua
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local ngx = require('ngx')
local insert = table.insert
local ipairs = ipairs
local pairs = pairs
local unpack = unpack
local ngxctx = ngx.ctx
local router = require('mf.racks.router')
local request = require('mf.racks.request')
local response = require('mf.racks.response')
local _M = {}
local _core_racks = {
router = router,
request = request,
response = response,
}
local _add_hooks = function(app, hks)
if type(hks) ~= 'table' then
return
end
for name, hk in pairs(hks) do
app:hook(name, hk)
end
end
local _init_config = function(app, config)
if type(config) == 'table' then
for key, val in pairs(config) do
app:config(key, val)
end
end
end
local _is_rack = function (rack)
if type(rack) == 'table'
and type(rack.init) =='function'
then
return true
end
return false
end
local _set_core_racks = function(app)
if type(_core_racks) == 'table' then
for name, rack in pairs(_core_racks) do
app:add(name, rack)
end
end
end
_M.handleErr = function(app, err)
ngx.say(err)
self:die(500)
end
_M.get = function(self, uri, act)
self:rack('router'):get(uri, act)
end
_M.post = function(self, uri, act)
self:rack('router'):post(uri, act)
end
_M.map = function(self, uri, methods, act)
self:rack('router'):some(uri, methods, act)
end
_M.resource = function(self, path, mod)
self:rack('router'):resource(path, mod)
end
_M.call = function(self, ctx)
local req = self:rack('request')
local route = self:rack('router'):matchRoute(req)
if not route then self:die(404, 'router not found') end
self:apply('before.request')
route:dispatch(req)
self:apply('after.request')
end
_M.die = function(self, status, msg)
--ngx.say(msg)
ngx.exit(status)
end
_M.context = function(self, name)
if type(ngxctx[name]) ~= 'table' then
ngxctx[name] = {}
end
return ngxctx[name]
end
local new = function(config)
local racks = {}
local mud = {}
local hooks = {}
local getRack = function(app, name)
return racks[name]
end
local addRack = function(app, name, rack)
if not _is_rack(rack) then error('invalid rack') end
racks[name] = rack
end
local _meta_index = function(app, key)
local rack = racks[key]
if rack then
return rack
end
local val = _M[key]
if val then
app[key] = val
end
return val
end
local hook = function(app, name, func)
if type(func) ~= 'function' then
return
end
if type(hooks[name]) ~= 'table' then
hooks[name] = {}
end
insert(hooks[name], func)
end
local applyHook = function(app, name)
local hks = hooks[name]
if type(hks) == 'table' then
for _, hk in ipairs(hks) do
local stat, err = pcall(hk, app)
if not stat then
app:handleErr(err)
break
end
end
end
end
local finalize = function(app)
--clean up & write output
local resp = racks['response']
local stat, headers, body = resp():finalize()
--todo set headers, cookies & sessions
ngx.say(body)
end
local config = function(app, key, val)
if not val then
return app[key]
else
app[key] = val
return val
end
end
local register = function(app, mw)
if type(mw) ~= 'table' and type(mw.call) ~= 'function' then
error('invalid mud')
end
mw.app = app
_add_hooks(app, mw.hooks)
insert(mud, 1, mw)
end
local getMud = function(app)
return mud
end
local run = function(app)
for _, m in ipairs(mud) do
local stat, err = pcall(m.call, m)
if not stat then
app:handleErr(err)
break
end
end
app:finalize()
end
local app = setmetatable({
rack = getRack,
add = addRack,
config = config,
register = register,
run = run,
apply = applyHook,
hook = hook,
finalize = finalize,
}, {__index = _meta_index})
_init_config(app, config)
_set_core_racks(app)
app:register(app)
return app
end
local _class_mt = {__newindex=function() error('unacceptable') end}
return setmetatable({new = new}, {__newindex = _class_mt})