libs/uvl/luasrc/uvl/errors.lua

   1 --[[
   2
   3 UCI Validation Layer - Error handling
   4 (c) 2008 Jo-Philipp Wich <xm@leipzig.freifunk.net>
   5 (c) 2008 Steven Barth <steven@midlink.org>
   6
   7 Licensed under the Apache License, Version 2.0 (the "License");
   8 you may not use this file except in compliance with the License.
   9 You may obtain a copy of the License at
  10
  11         http://www.apache.org/licenses/LICENSE-2.0
  12
  13 $Id$
  14
  15 ]]--
  16
  17 local uci = require "luci.model.uci"
  18 local uvl = require "luci.uvl"
  19 local util = require "luci.util"
  20 local string = require "string"
  21
  22 local ipairs, error, type = ipairs, error, type
  23 local tonumber, unpack = tonumber, unpack
  24
  25
  26 local luci = luci
  27
  28 module "luci.uvl.errors"
  29
  30 ERRCODES = {
  31         { 'UCILOAD',            'Unable to load config "%p": %1' },
  32
  33         { 'SCHEME',                     'Error in scheme "%p":\n%c' },
  34         { 'CONFIG',             'Error in config "%p":\n%c' },
  35         { 'SECTION',            'Error in section "%i" (%I):\n%c' },
  36         { 'OPTION',                     'Error in option "%i" (%I):\n%c' },
  37         { 'REFERENCE',          'Option "%i" has invalid reference specification %1:\n%c' },
  38         { 'DEPENDENCY',         'In dependency check for %t "%i":\n%c' },
  39
  40         { 'SME_FIND',           'Can not find scheme "%p" in "%1"' },
  41         { 'SME_READ',           'Can not access file "%1"' },
  42         { 'SME_REQFLD',         'Missing required scheme field "%1" in "%i"' },
  43         { 'SME_INVREF',         'Illegal reference "%1" to an anonymous section' },
  44         { 'SME_BADREF',         'Malformed reference in "%1"' },
  45         { 'SME_BADDEP',         'Malformed dependency specification "%1" in "%i"' },
  46         { 'SME_BADVAL',         'Malformed validator specification "%1" in "%i"' },
  47         { 'SME_ERRVAL',         'External validator "%1" failed: %2' },
  48         { 'SME_VBADPACK',       'Variable "%o" in scheme "%p" references unknown package "%1"' },
  49         { 'SME_VBADSECT',       'Variable "%o" in scheme "%p" references unknown section "%1"' },
  50         { 'SME_EBADPACK',       'Enum "%v" in scheme "%p" references unknown package "%1"' },
  51         { 'SME_EBADSECT',       'Enum "%v" in scheme "%p" references unknown section "%1"' },
  52         { 'SME_EBADOPT',        'Enum "%v" in scheme "%p" references unknown option "%1"'  },
  53         { 'SME_EBADTYPE',       'Enum "%v" in scheme "%p" references non-enum option "%I"' },
  54         { 'SME_EBADDEF',        'Enum "%v" in scheme "%p" redeclares the default value of "%I"' },
  55
  56         { 'SECT_UNKNOWN',       'Section "%i" (%I) not found in scheme' },
  57         { 'SECT_REQUIRED',      'Required section "%p.%S" not found in config' },
  58         { 'SECT_UNIQUE',        'Unique section "%p.%S" occurs multiple times in config' },
  59         { 'SECT_NAMED',         'The section of type "%p.%S" is stored anonymously in config but must be named' },
  60         { 'SECT_NOTFOUND',      'Section "%p.%s" not found in config' },
  61
  62         { 'OPT_UNKNOWN',        'Option "%i" (%I) not found in scheme' },
  63         { 'OPT_REQUIRED',       'Required option "%i" has no value' },
  64         { 'OPT_BADVALUE',       'Value "%1" of option "%i" is not defined in enum %2' },
  65         { 'OPT_INVVALUE',       'Value "%1" of option "%i" does not validate as datatype "%2"' },
  66         { 'OPT_NOTLIST',        'Option "%i" is defined as list but stored as plain value' },
  67         { 'OPT_DATATYPE',       'Option "%i" has unknown datatype "%1"' },
  68         { 'OPT_NOTFOUND',       'Option "%p.%s.%o" not found in config' },
  69
  70         { 'DEP_NOTEQUAL',       'Dependency (%1) failed:\nOption "%i" is not eqal "%2"' },
  71         { 'DEP_NOVALUE',        'Dependency (%1) failed:\nOption "%i" has no value' },
  72         { 'DEP_NOTVALID',       'Dependency (%1) failed:\n%c' },
  73         { 'DEP_RECURSIVE',      'Recursive dependency for option "%i" detected' },
  74         { 'DEP_BADENUM',        'In dependency check for enum value "%i":\n%c' }
  75 }
  76
  77 -- build error constants and instance constructors
  78 for i, v in ipairs(ERRCODES) do
  79         _M[v[1]] = function(...)
  80                 return error(i, ...)
  81         end
  82
  83         _M['ERR_'..v[1]] = i
  84 end
  85
  86
  87 function i18n(key, def)
  88         if luci.i18n then
  89                 return luci.i18n.translate(key,def)
  90         else
  91                 return def
  92         end
  93 end
  94
  95
  96 error = util.class()
  97
  98 function error.__init__(self, code, pso, args)
  99
 100         self.code = code
 101         self.args = ( type(args) == "table" and args or { args } )
 102
 103         if util.instanceof( pso, uvl.uvlitem ) then
 104                 self.stype = pso.sref[2]
 105                 self.package, self.section, self.option, self.value = unpack(pso.cref)
 106                 self.object = pso
 107                 self.value  = self.value or ( pso.value and pso:value() )
 108         else
 109                 pso = ( type(pso) == "table" and pso or { pso } )
 110
 111                 if pso[2] then
 112                         local uci = uci.cursor()
 113                         self.stype = uci:get(pso[1], pso[2]) or pso[2]
 114                 end
 115
 116                 self.package, self.section, self.option, self.value = unpack(pso)
 117         end
 118 end
 119
 120 function error.child(self, err)
 121         if not self.childs then
 122                 self.childs = { err }
 123         else
 124                 self.childs[#self.childs+1] = err
 125         end
 126         return self
 127 end
 128
 129 function error.string(self,pad)
 130         pad = pad or "  "
 131
 132         local str = i18n(
 133                 'uvl_err_%s' % string.lower(ERRCODES[self.code][1]),
 134                 ERRCODES[self.code][2]
 135         )
 136                 :gsub("\n", "\n"..pad)
 137                 :gsub("%%i", self:cid())
 138                 :gsub("%%I", self:sid())
 139                 :gsub("%%p", self.package or '(nil)')
 140                 :gsub("%%s", self.section or '(nil)')
 141                 :gsub("%%S", self.stype   or '(nil)')
 142                 :gsub("%%o", self.option  or '(nil)')
 143                 :gsub("%%v", self.value   or '(nil)')
 144                 :gsub("%%t", self.object and self.object:type()  or '(nil)' )
 145                 :gsub("%%T", self.object and self.object:title() or '(nil)' )
 146                 :gsub("%%([1-9])", function(n) return self.args[tonumber(n)] or '(nil)' end)
 147                 :gsub("%%c",
 148                         function()
 149                                 local s = ""
 150                                 for _, err in ipairs(self.childs or {}) do
 151                                         s = s .. err:string(pad.."  ") .. "\n" .. pad
 152                                 end
 153                                 return s
 154                         end
 155                 )
 156
 157         return (str:gsub("%s+$",""))
 158 end
 159
 160 function error.cid(self)
 161         return self.object and self.object:cid() or self.package ..
 162                 ( self.section and '.' .. self.section or '' ) ..
 163                 ( self.option  and '.' .. self.option  or '' ) ..
 164                 ( self.value   and '.' .. self.value   or '' )
 165 end
 166
 167 function error.sid(self)
 168         return self.object and self.object:sid() or self.package ..
 169                 ( self.stype   and '.' .. self.stype   or '' ) ..
 170                 ( self.option  and '.' .. self.option  or '' ) ..
 171                 ( self.value   and '.' .. self.value   or '' )
 172 end
 173
 174 function error.is(self, code)
 175         if self.code == code then
 176                 return true
 177         elseif self.childs then
 178                 for _, c in ipairs(self.childs) do
 179                         if c:is(code) then
 180                                 return true
 181                         end
 182                 end
 183         end
 184         return false
 185 end