modules/luci-base/htdocs/luci-static/resources/rpc.js

   1 'use strict';
   2
   3 var rpcRequestRegistry = {},
   4     rpcRequestBatch = null,
   5     rpcRequestID = 1,
   6     rpcSessionID = L.env.sessionid || '00000000000000000000000000000000';
   7
   8 return L.Class.extend({
   9         call: function(req, cbFn) {
  10                 var cb = cbFn.bind(this, req),
  11                     q = '';
  12
  13                 if (Array.isArray(req)) {
  14                         if (req.length == 0)
  15                                 return Promise.resolve([]);
  16
  17                         for (var i = 0; i < req.length; i++)
  18                                 q += '%s%s.%s'.format(
  19                                         q ? ';' : '/',
  20                                         req[i].params[1],
  21                                         req[i].params[2]
  22                                 );
  23                 }
  24                 else {
  25                         q += '/%s.%s'.format(req.params[1], req.params[2]);
  26                 }
  27
  28                 return L.Request.post(L.url('admin/ubus') + q, req, {
  29                         timeout: (L.env.rpctimeout || 5) * 1000,
  30                         credentials: true
  31                 }).then(cb);
  32         },
  33
  34         handleListReply: function(req, msg) {
  35                 var list = msg.result;
  36
  37                 /* verify message frame */
  38                 if (typeof(msg) != 'object' || msg.jsonrpc != '2.0' || !msg.id || !Array.isArray(list))
  39                         list = [ ];
  40
  41                 req.resolve(list);
  42         },
  43
  44         handleCallReply: function(reqs, res) {
  45                 var type = Object.prototype.toString,
  46                     data = [],
  47                     msg = null;
  48
  49                 if (!res.ok)
  50                         L.error('RPCError', 'RPC call failed with HTTP error %d: %s',
  51                                 res.status, res.statusText || '?');
  52
  53                 msg = res.json();
  54
  55                 if (!Array.isArray(reqs)) {
  56                         msg = [ msg ];
  57                         reqs = [ reqs ];
  58                 }
  59
  60                 for (var i = 0; i < msg.length; i++) {
  61                         /* fetch related request info */
  62                         var req = rpcRequestRegistry[reqs[i].id];
  63                         if (typeof(req) != 'object')
  64                                 throw 'No related request for JSON response';
  65
  66                         /* fetch response attribute and verify returned type */
  67                         var ret = undefined;
  68
  69                         /* verify message frame */
  70                         if (typeof(msg[i]) == 'object' && msg[i].jsonrpc == '2.0') {
  71                                 if (typeof(msg[i].error) == 'object' && msg[i].error.code && msg[i].error.message)
  72                                         req.reject(new Error('RPC call failed with error %d: %s'
  73                                                 .format(msg[i].error.code, msg[i].error.message || '?')));
  74                                 else if (Array.isArray(msg[i].result) && msg[i].result[0] == 0)
  75                                         ret = (msg[i].result.length > 1) ? msg[i].result[1] : msg[i].result[0];
  76                         }
  77                         else {
  78                                 req.reject(new Error('Invalid message frame received'));
  79                         }
  80
  81                         if (req.expect) {
  82                                 for (var key in req.expect) {
  83                                         if (ret != null && key != '')
  84                                                 ret = ret[key];
  85
  86                                         if (ret == null || type.call(ret) != type.call(req.expect[key]))
  87                                                 ret = req.expect[key];
  88
  89                                         break;
  90                                 }
  91                         }
  92
  93                         /* apply filter */
  94                         if (typeof(req.filter) == 'function') {
  95                                 req.priv[0] = ret;
  96                                 req.priv[1] = req.params;
  97                                 ret = req.filter.apply(this, req.priv);
  98                         }
  99
 100                         req.resolve(ret);
 101
 102                         /* store response data */
 103                         if (typeof(req.index) == 'number')
 104                                 data[req.index] = ret;
 105                         else
 106                                 data = ret;
 107
 108                         /* delete request object */
 109                         delete rpcRequestRegistry[reqs[i].id];
 110                 }
 111
 112                 return Promise.resolve(data);
 113         },
 114
 115         list: function() {
 116                 var msg = {
 117                         jsonrpc: '2.0',
 118                         id:      rpcRequestID++,
 119                         method:  'list',
 120                         params:  arguments.length ? this.varargs(arguments) : undefined
 121                 };
 122
 123                 return this.call(msg, this.handleListReply);
 124         },
 125
 126         batch: function() {
 127                 if (!Array.isArray(rpcRequestBatch))
 128                         rpcRequestBatch = [ ];
 129         },
 130
 131         flush: function() {
 132                 if (!Array.isArray(rpcRequestBatch))
 133                         return Promise.resolve([]);
 134
 135                 var req = rpcRequestBatch;
 136                 rpcRequestBatch = null;
 137
 138                 /* call rpc */
 139                 return this.call(req, this.handleCallReply);
 140         },
 141
 142         declare: function(options) {
 143                 return Function.prototype.bind.call(function(rpc, options) {
 144                         var args = this.varargs(arguments, 2);
 145                         return new Promise(function(resolveFn, rejectFn) {
 146                                 /* build parameter object */
 147                                 var p_off = 0;
 148                                 var params = { };
 149                                 if (Array.isArray(options.params))
 150                                         for (p_off = 0; p_off < options.params.length; p_off++)
 151                                                 params[options.params[p_off]] = args[p_off];
 152
 153                                 /* all remaining arguments are private args */
 154                                 var priv = [ undefined, undefined ];
 155                                 for (; p_off < args.length; p_off++)
 156                                         priv.push(args[p_off]);
 157
 158                                 /* store request info */
 159                                 var req = rpcRequestRegistry[rpcRequestID] = {
 160                                         expect:  options.expect,
 161                                         filter:  options.filter,
 162                                         resolve: resolveFn,
 163                                         reject:  rejectFn,
 164                                         params:  params,
 165                                         priv:    priv
 166                                 };
 167
 168                                 /* build message object */
 169                                 var msg = {
 170                                         jsonrpc: '2.0',
 171                                         id:      rpcRequestID++,
 172                                         method:  'call',
 173                                         params:  [
 174                                                 rpcSessionID,
 175                                                 options.object,
 176                                                 options.method,
 177                                                 params
 178                                         ]
 179                                 };
 180
 181                                 /* when a batch is in progress then store index in request data
 182                                  * and push message object onto the stack */
 183                                 if (Array.isArray(rpcRequestBatch))
 184                                         req.index = rpcRequestBatch.push(msg) - 1;
 185
 186                                 /* call rpc */
 187                                 else
 188                                         rpc.call(msg, rpc.handleCallReply);
 189                         });
 190                 }, this, this, options);
 191         },
 192
 193         setSessionID: function(sid) {
 194                 rpcSessionID = sid;
 195         }
 196 });