worker.sql-wasm.js

// We are modularizing this manually because the current modularize setting in Emscripten has some issues:
// https://github.com/kripken/emscripten/issues/5820
// In addition, When you use emcc's modularization, it still expects to export a global object called `Module`,
// which is able to be used/called before the WASM is loaded.
// The modularization below exports a promise that loads and resolves to the actual sql.js module.
// That way, this module can't be used before the WASM is finished loading.

// We are going to define a function that a user will call to start loading initializing our Sql.js library
// However, that function might be called multiple times, and on subsequent calls, we don't actually want it to instantiate a new instance of the Module
// Instead, we want to return the previously loaded module

// TODO: Make this not declare a global if used in the browser
var initSqlJsPromise = undefined;

var initSqlJs = function (moduleConfig) {

    if (initSqlJsPromise){
      return initSqlJsPromise;
    }
    // If we're here, we've never called this function before
    initSqlJsPromise = new Promise((resolveModule, reject) => {

        // We are modularizing this manually because the current modularize setting in Emscripten has some issues:
        // https://github.com/kripken/emscripten/issues/5820

        // The way to affect the loading of emcc compiled modules is to create a variable called `Module` and add
        // properties to it, like `preRun`, `postRun`, etc
        // We are using that to get notified when the WASM has finished loading.
        // Only then will we return our promise

        // If they passed in a moduleConfig object, use that
        // Otherwise, initialize Module to the empty object
        var Module = typeof moduleConfig !== 'undefined' ? moduleConfig : {};

        // EMCC only allows for a single onAbort function (not an array of functions)
        // So if the user defined their own onAbort function, we remember it and call it
        var originalOnAbortFunction = Module['onAbort'];
        Module['onAbort'] = function (errorThatCausedAbort) {
            reject(new Error(errorThatCausedAbort));
            if (originalOnAbortFunction){
              originalOnAbortFunction(errorThatCausedAbort);
            }
        };

        Module['postRun'] = Module['postRun'] || [];
        Module['postRun'].push(function () {
            // When Emscripted calls postRun, this promise resolves with the built Module
            resolveModule(Module);
        });

        // There is a section of code in the emcc-generated code below that looks like this:
        // (Note that this is lowercase `module`)
        // if (typeof module !== 'undefined') {
        //     module['exports'] = Module;
        // }
        // When that runs, it's going to overwrite our own modularization export efforts in shell-post.js!
        // The only way to tell emcc not to emit it is to pass the MODULARIZE=1 or MODULARIZE_INSTANCE=1 flags,
        // but that carries with it additional unnecessary baggage/bugs we don't want either.
        // So, we have three options:
        // 1) We undefine `module`
        // 2) We remember what `module['exports']` was at the beginning of this function and we restore it later
        // 3) We write a script to remove those lines of code as part of the Make process.
        //
        // Since those are the only lines of code that care about module, we will undefine it. It's the most straightforward
        // of the options, and has the side effect of reducing emcc's efforts to modify the module if its output were to change in the future.
        // That's a nice side effect since we're handling the modularization efforts ourselves
        module = undefined;
        
        // The emcc-generated code and shell-post.js code goes below,
        // meaning that all of it runs inside of this promise. If anything throws an exception, our promise will abort
var f;f||(f=typeof Module !== 'undefined' ? Module : {});
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        // The shell-pre.js and emcc-generated code goes above
        return Module;
    }); // The end of the promise being returned

  return initSqlJsPromise;
} // The end of our initSqlJs function

// This bit below is copied almost exactly from what you get when you use the MODULARIZE=1 flag with emcc
// However, we don't want to use the emcc modularization. See shell-pre.js
if (typeof exports === 'object' && typeof module === 'object'){
    module.exports = initSqlJs;
    // This will allow the module to be used in ES6 or CommonJS
    module.exports.default = initSqlJs;
}
else if (typeof define === 'function' && define['amd']) {
    define([], function() { return initSqlJs; });
}
else if (typeof exports === 'object'){
    exports["Module"] = initSqlJs;
}
    
// Generated by CoffeeScript 1.12.7
var createDb, db, sqlModuleReady;

if (typeof importScripts === 'function') {
  db = null;
  createDb = function(data) {
    if (db != null) {
      db.close();
    }
    return db = new SQL.Database(data);
  };
  sqlModuleReady = initSqlJs();
  self.onmessage = function(event) {
    return sqlModuleReady.then(function() {
      var buff, callback, data, done, err, result;
      data = event['data'];
      switch (data != null ? data['action'] : void 0) {
        case 'open':
          buff = data['buffer'];
          createDb((buff ? new Uint8Array(buff) : void 0));
          return postMessage({
            'id': data['id'],
            'ready': true
          });
        case 'exec':
          if (db === null) {
            createDb();
          }
          if (!data['sql']) {
            throw 'exec: Missing query string';
          }
          return postMessage({
            'id': data['id'],
            'results': db.exec(data['sql'])
          });
        case 'each':
          if (db === null) {
            createDb();
          }
          callback = function(row) {
            return postMessage({
              'id': data['id'],
              'row': row,
              'finished': false
            });
          };
          done = function() {
            return postMessage({
              'id': data['id'],
              'finished': true
            });
          };
          return db.each(data['sql'], data['params'], callback, done);
        case 'export':
          buff = db["export"]();
          result = {
            'id': data['id'],
            'buffer': buff
          };
          try {
            return postMessage(result, [result]);
          } catch (error) {
            err = error;
            return postMessage(result);
          }
          break;
        case 'close':
          return db != null ? db.close() : void 0;
        default:
          throw new 'Invalid action : ' + (data != null ? data['action'] : void 0);
      }
    });
  };
}