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path: root/share/server/loop.js
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// Licensed under the Apache License, Version 2.0 (the "License"); you may not
// use this file except in compliance with the License.  You may obtain a copy
// of the License at
//
//   http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
// License for the specific language governing permissions and limitations under
// the License.

var sandbox = null;

try {
  // if possible, use evalcx (not always available)
  sandbox = evalcx('');
  sandbox.emit = emit;
  sandbox.sum = sum;
  sandbox.log = log;
  sandbox.toJSON = toJSON;
  sandbox.respondWith = respondWith;
  sandbox.registerType = registerType;
} catch (e) {}

// Commands are in the form of json arrays:
// ["commandname",..optional args...]\n
//
// Responses are json values followed by a new line ("\n")

var cmd, cmdkey;

var dispatch = {
  "reset"      : State.reset,
  "add_fun"    : State.addFun,
  "map_doc"    : Views.mapDoc,
  "reduce"     : Views.reduce,
  "rereduce"   : Views.rereduce,
  "validate"   : Validate.validate,
  "show_doc"   : Render.showDoc,
  "list_begin" : Render.listBegin,
  "list_row"   : Render.listRow,
  "list_tail"  : Render.listTail 
};

while (cmd = eval(readline())) {
  try {
    cmdkey = cmd.shift();
    if (dispatch[cmdkey]) {
      // run the correct responder with the cmd body
      dispatch[cmdkey].apply(this, cmd);
    } else {
      // unknown command, quit and hope the restarted version is better
      respond({
        error: "query_server_error",
        reason: "unknown command '" + cmdkey + "'"});
      quit();
    }
  } catch(e) {
    respond(e);
  }
};