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Switch web implementation to sql.js

This commit is contained in:
Simon Binder 2019-07-03 21:51:56 +02:00
parent 4ee7e84e8c
commit 535c5ed871
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11 changed files with 453 additions and 179 deletions
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50
moor/example_web/README.md
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@ -1 +1,49 @@
Experimental example for using moor on the web.
Experimental example for using moor on the web.
This example bundles the `sql.js` library, licensed under the following license:
```
MIT license
===========
Copyright (c) 2017 sql.js authors (see AUTHORS)
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
# Some portions of the Makefile taken from:
Copyright 2017 Ryusei Yamaguchi
Permission is hereby granted, free of charge, to any person obtaining a copy of
this software and associated documentation files (the "Software"), to deal in
the Software without restriction, including without limitation the rights to
use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
the Software, and to permit persons to whom the Software is furnished to do so,
subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
```

1
moor/example_web/web/database.dart
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@ -23,6 +23,7 @@ class Database extends _$Database {
}
void insert(String text) async {
print('inserting with $text');
await into(todoEntries).insert(TodoEntriesCompanion(content: Value(text)));
}
}

2
moor/example_web/web/index.html
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@ -11,7 +11,7 @@
<link rel="icon" href="favicon.ico">
<script defer src="main.dart.js"></script>
<script defer src="https://cdn.jsdelivr.net/npm/alasql@0.4"></script>
<script src="sql-wasm.js"></script>
</head>
<body>

9
moor/example_web/web/main.dart
View File

@ -5,15 +5,14 @@ import 'package:moor/moor_web.dart';
import 'database.dart';
void main() async {
final db = Database(AlaSqlDatabase('database'));
final db = Database(WebDatabase('database', logStatements: true));
db.watchEntries().listen(print);
final content = querySelector('#description');
(querySelector('#add_todo_form') as FormElement).onSubmit.listen((e) {
final content = querySelector('#description') as InputElement;
e.preventDefault();
db.insert(content.text);
content.text = '';
db.insert(content.value);
content.value = '';
});
}

209
moor/example_web/web/sql-wasm.js Normal file
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@ -0,0 +1,209 @@
// 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 aa;var f;f||(f=typeof Module !== 'undefined' ? Module : {});
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function(a){null==a&&(a=this.nb++);return Vb(this.fb,a)};a.prototype.getBlob=function(a){var b;null==a&&(a=this.nb++);var c=Wb(this.fb,a);var d=Xb(this.fb,a);var e=new Uint8Array(c);for(a=b=0;0<=c?b<c:b>c;a=0<=c?++b:--b)e[a]=l[d+a];return e};a.prototype.get=function(a){var b,d;null!=a&&this.bind(a)&&this.step();var e=[];a=b=0;for(d=ib(this.fb);0<=d?b<d:b>d;a=0<=d?++b:--b)switch(Yb(this.fb,a)){case c.fc:case c.FLOAT:e.push(this.sc(a));break;case c.ic:e.push(this.tc(a));break;case c.Zb:e.push(this.getBlob(a));
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ea(a));this.db.handleError(ca(this.fb,b,c,a.length-1,0))};a.prototype.kc=function(a,b){var c;null==b&&(b=this.nb++);this.Eb.push(c=ea(a));this.db.handleError(Ia(this.fb,b,c,a.length,0))};a.prototype.oc=function(a,b){null==b&&(b=this.nb++);this.db.handleError((a===(a|0)?$b:ac)(this.fb,b,a))};a.prototype.nc=function(a){null==a&&(a=this.nb++);Ia(this.fb,a,0,0,0)};a.prototype.Qb=function(a,b){null==b&&(b=this.nb++);switch(typeof a){case "string":this.pc(a,b);break;case "number":case "boolean":this.oc(a+
0,b);break;case "object":if(null===a)this.nc(b);else if(null!=a.length)this.kc(a,b);else throw"Wrong API use : tried to bind a value of an unknown type ("+a+").";}};a.prototype.mc=function(a){var b;for(b in a){var c=a[b];var d=bc(this.fb,b);0!==d&&this.Qb(c,d)}return!0};a.prototype.lc=function(a){var b,c;var d=b=0;for(c=a.length;b<c;d=++b){var e=a[d];this.Qb(e,d+1)}return!0};a.prototype.reset=function(){this.freemem();return cc(this.fb)===c.xb&&dc(this.fb)===c.xb};a.prototype.freemem=function(){for(var a;a=
this.Eb.pop();)ha(a);return null};a.prototype.free=function(){this.freemem();var a=ec(this.fb)===c.xb;delete this.db.Bb[this.fb];this.fb=da;return a};return a}();var e=function(){function a(a){this.filename="dbfile_"+(4294967295*Math.random()>>>0);if(null!=a){var c=this.filename,d=c?n("/",c):"/";c=ia(!0,!0);d=ja(d,(void 0!==c?c:438)&4095|32768,0);if(a){if("string"===typeof a){for(var e=Array(a.length),k=0,m=a.length;k<m;++k)e[k]=a.charCodeAt(k);a=e}ka(d,c|146);e=p(d,"w");la(e,a,0,a.length,0,void 0);
ma(e);ka(d,c)}}this.handleError(g(this.filename,b));this.db=q(b,"i32");fc(this.db);this.Bb={}}a.prototype.run=function(a,c){if(!this.db)throw"Database closed";c?(a=this.prepare(a,c),a.step(),a.free()):this.handleError(m(this.db,a,0,0,b));return this};a.prototype.exec=function(a){if(!this.db)throw"Database closed";var c=na();var e=oa(a)+1;var g=h(e);r(a,l,g,e);a=g;e=h(4);for(g=[];q(a,"i8")!==da;){pa(b);pa(e);this.handleError(fa(this.db,a,-1,b,e));var k=q(b,"i32");a=q(e,"i32");if(k!==da){var m=new d(k,
this);for(k=null;m.step();)null===k&&(k={columns:m.getColumnNames(),values:[]},g.push(k)),k.values.push(m.get());m.free()}}qa(c);return g};a.prototype.each=function(a,b,c,d){"function"===typeof b&&(d=c,c=b,b=void 0);for(a=this.prepare(a,b);a.step();)c(a.getAsObject());a.free();if("function"===typeof d)return d()};a.prototype.prepare=function(a,c){pa(b);this.handleError(z(this.db,a,-1,b,da));a=q(b,"i32");if(a===da)throw"Nothing to prepare";var e=new d(a,this);null!=c&&e.bind(c);return this.Bb[a]=e};
a.prototype["export"]=function(){var a;var c=this.Bb;for(e in c){var d=c[e];d.free()}this.handleError(k(this.db));d=this.filename;var e=e={encoding:"binary"};e.flags=e.flags||"r";e.encoding=e.encoding||"binary";if("utf8"!==e.encoding&&"binary"!==e.encoding)throw Error('Invalid encoding type "'+e.encoding+'"');c=p(d,e.flags);d=ra(d).size;var m=new Uint8Array(d);sa(c,m,0,d,0);"utf8"===e.encoding?a=t(m,0):"binary"===e.encoding&&(a=m);ma(c);this.handleError(g(this.filename,b));this.db=q(b,"i32");return a};
a.prototype.close=function(){var a;var b=this.Bb;for(a in b){var c=b[a];c.free()}this.handleError(k(this.db));ta("/"+this.filename);return this.db=null};a.prototype.handleError=function(a){if(a===c.xb)return null;a=hc(this.db);throw Error(a);};a.prototype.getRowsModified=function(){return y(this.db)};a.prototype.create_function=function(a,b){var d=ua(function(a,c,d){var e,g;var k=[];for(e=g=0;0<=c?g<c:g>c;e=0<=c?++g:--g){var m=q(d+4*e,"i32");var z=jc(m);e=function(){switch(!1){case 1!==z:return kc;
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var Ia=f.cwrap("sqlite3_bind_blob","number",["number","number","number","number","number"]);var ac=f.cwrap("sqlite3_bind_double","number",["number","number","number"]);var $b=f.cwrap("sqlite3_bind_int","number",["number","number","number"]);var bc=f.cwrap("sqlite3_bind_parameter_index","number",["number","string"]);var Tb=f.cwrap("sqlite3_step","number",["number"]);var hc=f.cwrap("sqlite3_errmsg","string",["number"]);var ib=f.cwrap("sqlite3_data_count","number",["number"]);var Ub=f.cwrap("sqlite3_column_double",
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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;
}

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moor/example_web/web/sql-wasm.wasm Normal file
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13
moor/lib/moor_web.dart
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@ -1,22 +1,19 @@
/// A version of moor that runs on the web by using [AlaSQL.js](https://alasql.org/)
/// You manually need to include that library into your website by using
/// ```html
/// <script src="https://cdn.jsdelivr.net/npm/alasql@0.4"></script>
/// ```
/// A version of moor that runs on the web by using [sql.js](https://github.com/kripken/sql.js)
/// You manually need to include that library into your website to use the
/// web version of moor.
@experimental
library moor_web;
import 'dart:async';
import 'dart:convert' show json;
import 'dart:html';
import 'dart:indexed_db';
import 'dart:js';
import 'package:meta/meta.dart';
import 'package:meta/dart2js.dart';
import 'moor.dart';
export 'moor.dart';
part 'src/web/alasql.dart';
part 'src/web/functions.dart';
part 'src/web/sql_js.dart';

151
moor/lib/src/web/alasql.dart
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@ -1,151 +0,0 @@
part of 'package:moor/moor_web.dart';
JsObject _alasql = context['alasql'] as JsObject;
JsFunction _jsonStringify = context['JSON']['stringify'] as JsFunction;
class AlaSqlDatabase extends QueryExecutor {
JsObject _database;
final bool logStatements;
final String name;
Completer<bool> _opening;
AlaSqlDatabase(this.name, {this.logStatements = false}) {
_registerFunctions();
if (_alasql == null) {
throw UnsupportedError('Could not access the alasql javascript library. '
'The moor documentation contains instructions on how to setup moor '
'the web, which might help you fix this.');
}
_database = JsObject(_alasql['Database'] as JsFunction);
}
@override
TransactionExecutor beginTransaction() {
throw StateError(
'Transactions are not currently supported with the AlaSQL backend');
}
@override
Future<bool> ensureOpen() async {
if (_opening == null) {
_opening = Completer();
await _openInternal();
_opening.complete();
} else {
await _opening.future;
}
return true;
}
Future<void> _openInternal() async {
// AlaSQL doesn't give us any information about the schema version, so we
// first need to access the database without AlaSQL to find that out
if (!IdbFactory.supported) {
throw UnsupportedError("This browser doesn't support IndexedDb");
}
int version;
var upgradeNeeded = false;
final db = await window.indexedDB.open(
name,
version: databaseInfo.schemaVersion,
onUpgradeNeeded: (event) {
upgradeNeeded = true;
version = event.oldVersion;
},
);
db.close();
// todo handle possible injection vulnerability of $name
await _run('CREATE INDEXEDDB DATABASE IF NOT EXISTS `$name`;', const []);
await _run('ATTACH INDEXEDDB DATABASE `$name`;', const []);
await _run('USE `$name`;', const []);
if (upgradeNeeded) {
if (version == null || version < 1) {
await databaseInfo.handleDatabaseCreation(executor: _runWithoutArgs);
} else {
await databaseInfo.handleDatabaseVersionChange(
executor: _runWithoutArgs,
from: version,
to: databaseInfo.schemaVersion);
}
}
}
@override
Future<void> runBatched(List<BatchedStatement> statements) {
throw StateError(
'Batched statements are not currently supported with AlaSQL');
}
Future<dynamic> _runWithoutArgs(String query) {
return _run(query, const []);
}
Future<dynamic> _run(String query, List variables) {
final completer = Completer<dynamic>();
final args = [
query,
JsArray.from(variables),
allowInterop((data, error) {
if (error != null) {
completer.completeError(error);
} else {
completer.complete(data);
}
})
];
_database.callMethod('exec', args);
return completer.future;
}
@override
Future<void> runCustom(String statement) {
_runWithoutArgs(statement);
return Future.value();
}
@override
Future<int> runDelete(String statement, List args) {
return Future.value(_run(statement, args) as int);
}
@override
Future<int> runInsert(String statement, List args) {
// todo (needs api change). We need to know the table and column name
// to get the last insert id in AlaSQL. See https://github.com/agershun/alasql/wiki/AUTOINCREMENT
_run(statement, args);
return Future.value(42);
}
@override
Future<List<Map<String, dynamic>>> runSelect(
String statement, List args) async {
final result = await _run(statement, args) as JsArray;
return result.map((row) {
final jsRow = row as JsObject;
// todo this is a desperate attempt at converting the JsObject to a Map.
// Surely, there must be a better way to do this?
final objJson = _jsonStringify.apply([jsRow]) as String;
final dartMap = json.decode(objJson);
return dartMap as Map<String, dynamic>;
}).toList();
}
@override
Future<int> runUpdate(String statement, List args) {
return Future.value(_run(statement, args) as int);
}
}

12
moor/lib/src/web/functions.dart
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@ -1,12 +0,0 @@
part of 'package:moor/moor_web.dart';
final functions = _alasql['fn'] as JsObject;
void _registerFunctions() {
functions['strftime'] = allowInterop(_strftime);
}
int _strftime(String format, int i) {
// todo properly implement this
return DateTime.now().millisecondsSinceEpoch ~/ 1000;
}

183
moor/lib/src/web/sql_js.dart Normal file
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@ -0,0 +1,183 @@
part of 'package:moor/moor_web.dart';
const _initSqlJs = 'initSqlJs';
// ignore_for_file: cascade_invocations
/// Experimental moor backend for the web. To use this platform, you need to
/// include the latest version of `sql.js` in your html.
class WebDatabase extends QueryExecutor {
final bool logStatements;
final String name;
Completer<bool> _opening;
JsObject _database;
// resolves to the SQL module. See the `initSqlJs` call in https://github.com/kripken/sql.js#example-html-file
// This completer resolves to the `SQL` variable in that example.
static Completer<JsObject> _initializedWasm;
WebDatabase(this.name, {this.logStatements = false}) {
if (context.hasProperty(_initSqlJs) == null) {
throw UnsupportedError('Could not access the sql.js javascript library. '
'The moor documentation contains instructions on how to setup moor '
'the web, which might help you fix this.');
}
_loadWasmIfNeeded();
}
void _loadWasmIfNeeded() {
if (_initializedWasm != null) return;
_initializedWasm = Completer();
// initSqlJs().then((sql) => _initialitedWasm.complete(sql));
final promise = context.callMethod(_initSqlJs) as JsObject;
promise.callMethod('then', [
allowInterop((JsObject data) {
_initializedWasm.complete(data);
})
]);
}
@override
TransactionExecutor beginTransaction() {
throw StateError(
'Transactions are not currently supported with the sql.js backend');
}
@override
Future<bool> ensureOpen() async {
if (_opening == null) {
_opening = Completer();
await _openInternal();
_opening.complete();
} else {
await _opening.future;
}
return true;
}
Future<void> _openInternal() async {
// We don't get information about the database version from sql.js, so we
// create another database just to manage versions.
if (!IdbFactory.supported) {
throw UnsupportedError("This browser doesn't support IndexedDb");
}
int version;
var upgradeNeeded = false;
final db = await window.indexedDB.open(
name,
version: databaseInfo.schemaVersion,
onUpgradeNeeded: (event) {
upgradeNeeded = true;
version = event.oldVersion;
},
);
db.close();
final sql = await _initializedWasm.future;
// var db = new SQL.Database()
_database = JsObject(sql['Database'] as JsFunction);
assert(() {
// set the window.db variable to make debugging easier
context['db'] = _database;
return true;
}());
if (upgradeNeeded) {
if (version == null || version < 1) {
await databaseInfo.handleDatabaseCreation(executor: _runWithoutArgs);
} else {
await databaseInfo.handleDatabaseVersionChange(
executor: _runWithoutArgs,
from: version,
to: databaseInfo.schemaVersion);
}
}
}
@override
Future<void> runBatched(List<BatchedStatement> statements) {
throw StateError(
'Batched statements are not currently supported with the web backend');
}
@tryInline
void _log(String sql, List<dynamic> variables) {
if (logStatements) {
print('[moor_web]: Running $sql with bound args: $variables');
}
}
/// Executes [sql] with the bound [variables], and ignores the result.
void _runSimple(String sql, List<dynamic> variables) {
_log(sql, variables);
if (variables.isEmpty) {
_database.callMethod('run', [sql]);
} else {
_database.callMethod('run', [sql, JsArray.from(variables)]);
}
}
Future<void> _runWithoutArgs(String query) {
_runSimple(query, const []);
return Future.value(null);
}
/// Returns the amount of rows affected by the most recent INSERT, UPDATE or
/// DELETE statement.
int _getModifiedRows() {
return _database.callMethod('getRowsModified') as int;
}
@override
Future<void> runCustom(String statement) {
return _runWithoutArgs(statement);
}
@override
Future<int> runDelete(String statement, List args) {
_runSimple(statement, args);
return Future.value(_getModifiedRows());
}
@override
Future<int> runInsert(String statement, List args) {
// todo get last insert id
// _runSimple("INSERT INTO todo_entries (content) VALUES ('test')", const []);
_runSimple(statement, args);
return Future.value(42);
}
@override
Future<int> runUpdate(String statement, List args) {
_runSimple(statement, args);
return Future.value(_getModifiedRows());
}
@override
Future<List<Map<String, dynamic>>> runSelect(
String statement, List args) async {
_log(statement, args);
// todo at least for stream queries we should cache prepared statements.
final stmt = _database.callMethod('prepare', [statement]) as JsObject;
stmt.callMethod('bind', [args]);
List<String> columnNames;
final rows = <Map<String, dynamic>>[];
while (stmt.callMethod('step') as bool) {
columnNames ??=
(stmt.callMethod('getColumnNames') as JsArray).cast<String>();
final row = stmt.callMethod('get') as JsArray;
rows.add({for (var i = 0; i < row.length; i++) columnNames[i]: row[i]});
}
stmt.callMethod('free');
return rows;
}
}

2
moor/pubspec.yaml
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@ -9,7 +9,7 @@ authors:
maintainer: Simon Binder (@simolus3)
environment:
sdk: '>=2.2.0 <3.0.0'
sdk: '>=2.2.2 <3.0.0'
dependencies:
meta: '>= 1.0.0 <2.0.0'