webmcp
view framework/bin/mcp.lua @ 215:ba3dd4a17e3d
Some code cleanup/rearrangement for request handling
| author | jbe |
|---|---|
| date | Mon Jan 12 01:48:11 2015 +0100 (2015-01-12) |
| parents | 6ac7133bb58e |
| children | 7f9c9c4434a1 |
line source
1 #!/usr/bin/env moonbridge
3 WEBMCP_VERSION = "2.0.0_devel"
5 -- check if interactive mode
6 if listen then -- defined by moonbridge
7 WEBMCP_MODE = "listen"
8 else
9 WEBMCP_MODE = "interactive"
10 end
12 -- configuration names are provided as 4th, 5th, etc. argument
13 WEBMCP_CONFIG_NAMES = {select(4, ...)}
15 -- determine framework and bath path from command line arguments
16 -- or print usage synopsis (if applicable)
17 do
18 local arg1, arg2, arg3 = ...
19 local helpout
20 if
21 arg1 == "-h" or arg1 == "--help" or
22 arg2 == "-h" or arg2 == "--help" -- if first arg is provided by wrapper
23 then
24 helpout = io.stdout
25 elseif
26 #config_args < 1 or
27 (WEBMCP_MODE == "interactive") ~= (arg3 == "INTERACTIVE")
28 then
29 helpout = io.stderr
30 end
31 helpout:write("Usage: moonbridge -- <framework path>/bin/mcp.lua <framework path> <app base path> <app name> <config name> [<config name> ...]\n")
32 helpout:write(" or: lua -i <framework path>/bin/mcp.lua <framework path> <app base path> INTERACTIVE <config name> [<config name> ...]\n")
33 if helpout then
34 if helpout == io.stderr then
35 return 1
36 else
37 return 0
38 end
39 end
40 local function append_trailing_slash(str)
41 return string.sub(str, "([^/])$", function(last) return last .. "/" end)
42 end
43 WEBMCP_FRAMEWORK_PATH = append_trailing_slash(arg1)
44 WEBMCP_BASE_PATH = append_trailing_slash(arg2)
45 if WEBMCP_MODE == "listen" then
46 WEBMCP_APP_NAME = arg3
47 end
48 end
50 -- setup search paths for libraries
51 do
52 package.path = WEBMCP_FRAMEWORK_PATH .. "lib/?.lua;" .. package.path
53 -- find out which file name extension shared libraries have
54 local slib_exts = {}
55 for ext in string.gmatch(package.cpath, "%?%.([A-Za-z0-9_-]+)") do
56 slib_exts[ext] = true
57 end
58 local paths = {}
59 for ext in pairs(slib_exts) do
60 paths[#paths+1] = WEBMCP_FRAMEWORK_PATH .. "accelerator/?." .. ext
61 end
62 for ext in pairs(slib_exts) do
63 paths[#paths+1] = WEBMCP_FRAMEWORK_PATH .. "lib/?." .. ext
64 end
65 paths[#paths+1] = package.cpath
66 package.cpath = table.concat(paths, ";")
67 end
69 -- autoloader system for WebMCP environment "$WEBMCP_FRAMEWORK_PATH/env/",
70 -- application environment extensions "$WEBMCP_BASE_PATH/env/"
71 -- and models "$WEBMCP_BASE_PATH/model/"
72 do
73 local weakkey_mt = { __mode = "k" }
74 local autoloader_category = setmetatable({}, weakkey_mt)
75 local autoloader_path = setmetatable({}, weakkey_mt)
76 local autoloader_mt = {}
77 local function install_autoloader(self, category, path)
78 autoloader_category[self] = category
79 autoloader_path[self] = path
80 setmetatable(self, autoloader_mt)
81 end
82 local function try_exec(filename)
83 local file = io.open(filename, "r")
84 if file then
85 local filedata = file:read("*a")
86 io.close(file)
87 local func, errmsg = load(filedata, "=" .. filename)
88 if func then
89 func()
90 return true
91 else
92 error(errmsg, 0)
93 end
94 else
95 return false
96 end
97 end
98 local function compose_path_string(base, path, key)
99 if #path == 0 then
100 return base .. "/" .. key
101 else
102 return base .. table.concat(path, "/") .. "/" .. key
103 end
104 end
105 function autoloader_mt.__index(self, key)
106 local category, base_path, merge_base_path, file_key
107 local merge = false
108 if
109 string.find(key, "^[a-z_][A-Za-z0-9_]*$") and
110 not string.find(key, "^__")
111 then
112 category = "env"
113 base_path = WEBMCP_FRAMEWORK_PATH .. "env/"
114 merge = true
115 merge_base_path = WEBMCP_BASE_PATH .. "env/"
116 file_key = key
117 elseif string.find(key, "^[A-Z][A-Za-z0-9]*$") then
118 category = "model"
119 base_path = WEBMCP_BASE_PATH .. "model/"
120 local first = true
121 file_key = string.gsub(key, "[A-Z]",
122 function(c)
123 if first then
124 first = false
125 return string.lower(c)
126 else
127 return "_" .. string.lower(c)
128 end
129 end
130 )
131 else
132 return
133 end
134 local required_category = autoloader_category[self]
135 if required_category and required_category ~= category then return end
136 local path = autoloader_path[self]
137 local path_string = compose_path_string(base_path, path, file_key)
138 local merge_path_string
139 if merge then
140 merge_path_string = compose_path_string(
141 merge_base_path, path, file_key
142 )
143 end
144 local function try_dir(dirname)
145 local dir = io.open(dirname)
146 if dir then
147 io.close(dir)
148 local obj = {}
149 local sub_path = {}
150 for i = 1, #path do sub_path[i] = path[i] end
151 sub_path[#path+1] = file_key
152 install_autoloader(obj, category, sub_path)
153 rawset(self, key, obj)
154 try_exec(path_string .. "/__init.lua")
155 if merge then try_exec(merge_path_string .. "/__init.lua") end
156 return true
157 else
158 return false
159 end
160 end
161 if merge and try_exec(merge_path_string .. ".lua") then
162 elseif merge and try_dir(merge_path_string .. "/") then
163 elseif try_exec(path_string .. ".lua") then
164 elseif try_dir(path_string .. "/") then
165 else end
166 return rawget(self, key)
167 end
168 install_autoloader(_G, nil, {})
169 try_exec(WEBMCP_FRAMEWORK_PATH .. "env/__init.lua")
170 try_exec(WEBMCP_BASE_PATH .. "env/__init.lua")
171 end
173 -- replace Moonbridge listen function
174 local moonbridge_listen = listen
175 local listeners
176 function listen(args)
177 listeners[#listeners+1] = args
178 end
180 -- prohibit (unintended) definition of new global variables
181 _ENV = setmetatable({}, {
182 __index = _G,
183 __newindex = function()
184 error("Setting of global variable prohibited")
185 end
186 })
188 -- execute configurations
189 for i, config_name in ipairs(WEBMCP_CONFIG_NAMES) do
190 execute.config(config_name)
191 execute.prefork_initializers()
192 end
194 -- interactive console mode
195 if WEBMCP_MODE == "interactive" then
196 execute.postfork_initializers()
197 trace.disable() -- avoids memory leakage (TODO: needs general solution for moonbridge?)
198 end
200 -- invoke moonbridge
201 if WEBMCP_MODE == "listen" then
202 local http = require("moonbridge_http")
203 for i, listener in ipairs(listeners) do
204 listener.prepare = execute.postfork_initializers
205 listener.connect = http.generate_handler(
206 request.handler,
207 request.get_http_options()
208 )
209 listener.finish = execute.finalizers
210 moonbridge_listen(listener)
211 end
212 end