ride-data-store/rds.js

ridematching transport logistics database

// Generated by CoffeeScript 1.12.7
(function() {
  var crypt, generateId, stream;

  crypt = require('crypto');

  stream = require('stream');

  generateId = function() {
    return crypt.randomBytes(7).toString('hex') + new Date().getTime();
  };

  module.exports = function(placeDB, rideDB) {
    var find, get, prepare, resolveRoute;
    resolveRoute = function(ride, cb) {
      return placeDB.lookup(ride != null ? ride.from : void 0, function(from) {
        if (from.error) {
          return cb(from);
        }
        return placeDB.lookup(ride != null ? ride.to : void 0, function(to) {
          if (to.error) {
            return cb(to);
          }
          return cb(from.name + "/" + to.name + "/");
        });
      });
    };
    prepare = function(ride, cb) {
      return resolveRoute(ride, function(route) {
        if (route.error) {
          return cb(route);
        }
        ride.route = route;
        if (ride.id) {
          return get(ride.id, function(r) {
            rideDB.del(route + r.type + "/" + r.time + "/" + r.id);
            if (!ride.status) {
              ride.status = r.status;
            }
            if (!ride.price) {
              ride.price = r.price;
            }
            if (!ride.time) {
              ride.time = r.time;
            }
            if (!ride.type) {
              ride.type = r.type;
            }
            return cb(ride);
          });
        } else {
          ride.id = generateId();
          if (!ride.type) {
            ride.type = "offer";
          }
          if (!ride.status) {
            ride.status = "new";
          }
          if (!ride.time) {
            ride.time = new Date().getTime();
          }
          return cb(ride);
        }
      });
    };
    return {
      save: function(ride, cb) {
        return prepare(ride, function(r) {
          var key;
          if (r.error) {
            return cb(r);
          }
          key = r.route + r.type + "/" + r.time + "/" + r.id;
          if (ride.status === "public") {
            rideDB.put(key, JSON.stringify(ride) + "\n");
          }
          return rideDB.put("id:" + ride.id, JSON.stringify(ride), function(err) {
            return cb(ride);
          });
        });
      },
      get: get = function(id, cb) {
        return rideDB.get("id:" + id, function(err, ride) {
          if (ride) {
            return cb(JSON.parse(ride));
          } else {
            return cb(null);
          }
        });
      },
      find: find = function(query, cb) {
        return resolveRoute(query, function(route) {
          if (route.error) {
            return cb(new stream.Readable({
              read: function() {
                return this.push(null);
              }
            }));
          } else {
            route += (query.type || "offer") + "/";
            if (query.time) {
              return cb(rideDB.createValueStream({
                gte: route + query.time,
                lt: route + "~",
                reverse: true
              }));
            } else {
              return cb(rideDB.createValueStream({
                gte: route,
                lt: route + "~"
              }));
            }
          }
        });
      },
      close: function() {
        rideDB.close();
        return placeDB.close();
      }
    };
  };

}).call(this);