offline-check.js

var localStorage = require("crudlet-local-storage");
var http         = require("crudlet-http");
var crud         = require("crudlet");

var localdb = crud.tailable(localStorage());
var opsdb   = crud.child(localdb, { collection: "operations" });
var api     = http({ prefix: "/api" });

// hit the API first, then fallback to local storage if
// api doesn't properly persist
var db     = crud.first(api, function(operation) {
  return opsdb(crud.op("insert", { data: operation }));
});

// wait for an operation to persist to 
opsdb(crud.op("tail")).on("data", function() {
  online(drainLocalDatabase);
});

function drainLocalDatabase() {
  opsdb(crud.op("load", {
    multi: true
  })).pipe(crud.open(api)).on("end", function() {
  
    // remove all operations in the db
    opsdb(crud.op("remove", {
      multi: true
    }))
  });
}

function online(callback) {
  // check if user is online. 
}