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flatbuffers/tests/JavaScriptTest.js

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// Run this using JavaScriptTest.sh
var assert = require('assert');
var fs = require('fs');
var flatbuffers = require('../js/flatbuffers').flatbuffers;
var MyGame = require(process.argv[2]).MyGame;
function main() {
// First, let's test reading a FlatBuffer generated by C++ code:
// This file was generated from monsterdata_test.json
var data = new Uint8Array(fs.readFileSync('monsterdata_test.mon'));
// Now test it:
var bb = new flatbuffers.ByteBuffer(data);
testBuffer(bb);
// Second, let's create a FlatBuffer from scratch in JavaScript, and test it also.
// We use an initial size of 1 to exercise the reallocation algorithm,
// normally a size larger than the typical FlatBuffer you generate would be
// better for performance.
var fbb = new flatbuffers.Builder(1);
// We set up the same values as monsterdata.json:
var str = fbb.createString('MyMonster');
var inv = MyGame.Example.Monster.createInventoryVector(fbb, [0, 1, 2, 3, 4]);
var fred = fbb.createString('Fred');
MyGame.Example.Monster.startMonster(fbb);
MyGame.Example.Monster.addName(fbb, fred);
var mon2 = MyGame.Example.Monster.endMonster(fbb);
MyGame.Example.Monster.startTest4Vector(fbb, 2);
MyGame.Example.Test.createTest(fbb, 10, 20);
MyGame.Example.Test.createTest(fbb, 30, 40);
var test4 = fbb.endVector();
var testArrayOfString = MyGame.Example.Monster.createTestarrayofstringVector(fbb, [
fbb.createString('test1'),
fbb.createString('test2')
]);
MyGame.Example.Monster.startMonster(fbb);
MyGame.Example.Monster.addPos(fbb, MyGame.Example.Vec3.createVec3(fbb, 1, 2, 3, 3, MyGame.Example.Color.Green, 5, 6));
MyGame.Example.Monster.addHp(fbb, 80);
MyGame.Example.Monster.addName(fbb, str);
MyGame.Example.Monster.addInventory(fbb, inv);
MyGame.Example.Monster.addTestType(fbb, MyGame.Example.Any.Monster);
MyGame.Example.Monster.addTest(fbb, mon2);
MyGame.Example.Monster.addTest4(fbb, test4);
MyGame.Example.Monster.addTestarrayofstring(fbb, testArrayOfString);
MyGame.Example.Monster.addTestbool(fbb, false);
var mon = MyGame.Example.Monster.endMonster(fbb);
MyGame.Example.Monster.finishMonsterBuffer(fbb, mon);
// Write the result to a file for debugging purposes:
// Note that the binaries are not necessarily identical, since the JSON
// parser may serialize in a slightly different order than the above
// JavaScript code. They are functionally equivalent though.
fs.writeFileSync('monsterdata_javascript_wire.mon', new Buffer(fbb.asUint8Array()));
// Tests mutation first. This will verify that we did not trample any other
// part of the byte buffer.
testMutation(fbb.dataBuffer());
testBuffer(fbb.dataBuffer());
test64bit();
testUnicode();
fuzzTest1();
console.log('FlatBuffers test: completed successfully');
}
function testMutation(bb) {
var monster = MyGame.Example.Monster.getRootAsMonster(bb);
monster.mutate_hp(120);
assert.strictEqual(monster.hp(), 120);
monster.mutate_hp(80);
assert.strictEqual(monster.hp(), 80);
var manaRes = monster.mutate_mana(10);
assert.strictEqual(manaRes, false); // Field was NOT present, because default value.
// TODO: There is not the availability to mutate structs or vectors.
}
function testBuffer(bb) {
assert.ok(MyGame.Example.Monster.bufferHasIdentifier(bb));
var monster = MyGame.Example.Monster.getRootAsMonster(bb);
assert.strictEqual(monster.hp(), 80);
assert.strictEqual(monster.mana(), 150); // default
assert.strictEqual(monster.name(), 'MyMonster');
var pos = monster.pos();
assert.strictEqual(pos.x(), 1);
assert.strictEqual(pos.y(), 2);
assert.strictEqual(pos.z(), 3);
assert.strictEqual(pos.test1(), 3);
assert.strictEqual(pos.test2(), MyGame.Example.Color.Green);
var t = pos.test3();
assert.strictEqual(t.a(), 5);
assert.strictEqual(t.b(), 6);
assert.strictEqual(monster.testType(), MyGame.Example.Any.Monster);
var monster2 = new MyGame.Example.Monster();
assert.strictEqual(monster.test(monster2) != null, true);
assert.strictEqual(monster2.name(), 'Fred');
assert.strictEqual(monster.inventoryLength(), 5);
var invsum = 0;
for (var i = 0; i < monster.inventoryLength(); i++) {
invsum += monster.inventory(i);
}
assert.strictEqual(invsum, 10);
var invsum2 = 0;
var invArr = monster.inventoryArray();
for (var i = 0; i < invArr.length; i++) {
invsum2 += invArr[i];
}
assert.strictEqual(invsum2, 10);
var test_0 = monster.test4(0);
var test_1 = monster.test4(1);
assert.strictEqual(monster.test4Length(), 2);
assert.strictEqual(test_0.a() + test_0.b() + test_1.a() + test_1.b(), 100);
assert.strictEqual(monster.testarrayofstringLength(), 2);
assert.strictEqual(monster.testarrayofstring(0), 'test1');
assert.strictEqual(monster.testarrayofstring(1), 'test2');
assert.strictEqual(monster.testbool(), false);
}
function test64bit() {
var fbb = new flatbuffers.Builder();
var required = fbb.createString('required');
MyGame.Example.Stat.startStat(fbb);
var stat2 = MyGame.Example.Stat.endStat(fbb);
MyGame.Example.Monster.startMonster(fbb);
MyGame.Example.Monster.addName(fbb, required);
MyGame.Example.Monster.addTestempty(fbb, stat2);
var mon2 = MyGame.Example.Monster.endMonster(fbb);
MyGame.Example.Stat.startStat(fbb);
// 2541551405100253985 = 0x87654321(low part) + 0x23456789 * 0x100000000(high part);
MyGame.Example.Stat.addVal(fbb, new flatbuffers.Long(0x87654321, 0x23456789)); // the low part is Uint32
var stat = MyGame.Example.Stat.endStat(fbb);
MyGame.Example.Monster.startMonster(fbb);
MyGame.Example.Monster.addName(fbb, required);
MyGame.Example.Monster.addEnemy(fbb, mon2);
MyGame.Example.Monster.addTestempty(fbb, stat);
var mon = MyGame.Example.Monster.endMonster(fbb);
MyGame.Example.Monster.finishMonsterBuffer(fbb, mon);
var bytes = fbb.asUint8Array();
////////////////////////////////////////////////////////////////
var bb = new flatbuffers.ByteBuffer(bytes);
assert.ok(MyGame.Example.Monster.bufferHasIdentifier(bb));
var mon = MyGame.Example.Monster.getRootAsMonster(bb);
var stat = mon.testempty();
assert.strictEqual(stat != null, true);
assert.strictEqual(stat.val() != null, true);
assert.strictEqual(stat.val().toFloat64(), 2541551405100253985);
var mon2 = mon.enemy();
assert.strictEqual(mon2 != null, true);
stat = mon2.testempty();
assert.strictEqual(stat != null, true);
assert.strictEqual(stat.val() != null, true);
assert.strictEqual(stat.val().low, 0); // default value
assert.strictEqual(stat.val().high, 0);
}
function testUnicode() {
var correct = fs.readFileSync('unicode_test.mon');
var json = JSON.parse(fs.readFileSync('unicode_test.json', 'utf8'));
// Test reading
function testReadingUnicode(bb) {
var monster = MyGame.Example.Monster.getRootAsMonster(bb);
assert.strictEqual(monster.name(), json.name);
assert.deepEqual(new Buffer(monster.name(flatbuffers.Encoding.UTF8_BYTES)), new Buffer(json.name));
assert.strictEqual(monster.testarrayoftablesLength(), json.testarrayoftables.length);
json.testarrayoftables.forEach(function(table, i) {
var value = monster.testarrayoftables(i);
assert.strictEqual(value.name(), table.name);
assert.deepEqual(new Buffer(value.name(flatbuffers.Encoding.UTF8_BYTES)), new Buffer(table.name));
});
assert.strictEqual(monster.testarrayofstringLength(), json.testarrayofstring.length);
json.testarrayofstring.forEach(function(string, i) {
assert.strictEqual(monster.testarrayofstring(i), string);
assert.deepEqual(new Buffer(monster.testarrayofstring(i, flatbuffers.Encoding.UTF8_BYTES)), new Buffer(string));
});
}
testReadingUnicode(new flatbuffers.ByteBuffer(new Uint8Array(correct)));
// Test writing
var fbb = new flatbuffers.Builder();
var name = fbb.createString(json.name);
var testarrayoftablesOffsets = json.testarrayoftables.map(function(table) {
var name = fbb.createString(new Uint8Array(new Buffer(table.name)));
MyGame.Example.Monster.startMonster(fbb);
MyGame.Example.Monster.addName(fbb, name);
return MyGame.Example.Monster.endMonster(fbb);
});
var testarrayoftablesOffset = MyGame.Example.Monster.createTestarrayoftablesVector(fbb,
testarrayoftablesOffsets);
var testarrayofstringOffset = MyGame.Example.Monster.createTestarrayofstringVector(fbb,
json.testarrayofstring.map(function(string) { return fbb.createString(string); }));
MyGame.Example.Monster.startMonster(fbb);
MyGame.Example.Monster.addTestarrayofstring(fbb, testarrayofstringOffset);
MyGame.Example.Monster.addTestarrayoftables(fbb, testarrayoftablesOffset);
MyGame.Example.Monster.addName(fbb, name);
MyGame.Example.Monster.finishMonsterBuffer(fbb, MyGame.Example.Monster.endMonster(fbb));
testReadingUnicode(new flatbuffers.ByteBuffer(fbb.asUint8Array()));
}
var __imul = Math.imul ? Math.imul : function(a, b) {
var ah = a >> 16 & 65535;
var bh = b >> 16 & 65535;
var al = a & 65535;
var bl = b & 65535;
return al * bl + (ah * bl + al * bh << 16) | 0;
};
// Include simple random number generator to ensure results will be the
// same cross platform.
// http://en.wikipedia.org/wiki/Park%E2%80%93Miller_random_number_generator
var lcg_seed = 48271;
function lcg_rand() {
return lcg_seed = (__imul(lcg_seed, 279470273) >>> 0) % 4294967291;
}
function lcg_reset() {
lcg_seed = 48271;
}
// Converts a Field ID to a virtual table offset.
function fieldIndexToOffset(field_id) {
// Should correspond to what EndTable() below builds up.
var fixed_fields = 2; // Vtable size and Object Size.
return (field_id + fixed_fields) * 2;
}
// Low level stress/fuzz test: serialize/deserialize a variety of
// different kinds of data in different combinations
function fuzzTest1() {
// Values we're testing against: chosen to ensure no bits get chopped
// off anywhere, and also be different from eachother.
var bool_val = true;
var char_val = -127; // 0x81
var uchar_val = 0xFF;
var short_val = -32222; // 0x8222;
var ushort_val = 0xFEEE;
var int_val = 0x83333333 | 0;
var uint_val = 0xFDDDDDDD;
var long_val = new flatbuffers.Long(0x44444444, 0x84444444);
var ulong_val = new flatbuffers.Long(0xCCCCCCCC, 0xFCCCCCCC);
var float_val = new Float32Array([3.14159])[0];
var double_val = 3.14159265359;
var test_values_max = 11;
var fields_per_object = 4;
var num_fuzz_objects = 10000; // The higher, the more thorough :)
var builder = new flatbuffers.Builder();
lcg_reset(); // Keep it deterministic.
var objects = [];
// Generate num_fuzz_objects random objects each consisting of
// fields_per_object fields, each of a random type.
for (var i = 0; i < num_fuzz_objects; i++) {
builder.startObject(fields_per_object);
for (var f = 0; f < fields_per_object; f++) {
var choice = lcg_rand() % test_values_max;
switch (choice) {
case 0: builder.addFieldInt8(f, bool_val, 0); break;
case 1: builder.addFieldInt8(f, char_val, 0); break;
case 2: builder.addFieldInt8(f, uchar_val, 0); break;
case 3: builder.addFieldInt16(f, short_val, 0); break;
case 4: builder.addFieldInt16(f, ushort_val, 0); break;
case 5: builder.addFieldInt32(f, int_val, 0); break;
case 6: builder.addFieldInt32(f, uint_val, 0); break;
case 7: builder.addFieldInt64(f, long_val, flatbuffers.Long.ZERO); break;
case 8: builder.addFieldInt64(f, ulong_val, flatbuffers.Long.ZERO); break;
case 9: builder.addFieldFloat32(f, float_val, 0); break;
case 10: builder.addFieldFloat64(f, double_val, 0); break;
}
}
objects.push(builder.endObject());
}
builder.prep(8, 0); // Align whole buffer.
lcg_reset(); // Reset.
builder.finish(objects[objects.length - 1]);
var bytes = new Uint8Array(builder.asUint8Array());
var view = new DataView(bytes.buffer);
// Test that all objects we generated are readable and return the
// expected values. We generate random objects in the same order
// so this is deterministic.
for (var i = 0; i < num_fuzz_objects; i++) {
var offset = bytes.length - objects[i];
for (var f = 0; f < fields_per_object; f++) {
var choice = lcg_rand() % test_values_max;
var vtable_offset = fieldIndexToOffset(f);
var vtable = offset - view.getInt32(offset, true);
assert.ok(vtable_offset < view.getInt16(vtable, true));
var field_offset = offset + view.getInt16(vtable + vtable_offset, true);
switch (choice) {
case 0: assert.strictEqual(!!view.getInt8(field_offset), bool_val); break;
case 1: assert.strictEqual(view.getInt8(field_offset), char_val); break;
case 2: assert.strictEqual(view.getUint8(field_offset), uchar_val); break;
case 3: assert.strictEqual(view.getInt16(field_offset, true), short_val); break;
case 4: assert.strictEqual(view.getUint16(field_offset, true), ushort_val); break;
case 5: assert.strictEqual(view.getInt32(field_offset, true), int_val); break;
case 6: assert.strictEqual(view.getUint32(field_offset, true), uint_val); break;
case 7: assert.strictEqual(view.getInt32(field_offset, true), long_val.low); assert.strictEqual(view.getInt32(field_offset + 4, true), long_val.high); break;
case 8: assert.strictEqual(view.getInt32(field_offset, true), ulong_val.low); assert.strictEqual(view.getInt32(field_offset + 4, true), ulong_val.high); break;
case 9: assert.strictEqual(view.getFloat32(field_offset, true), float_val); break;
case 10: assert.strictEqual(view.getFloat64(field_offset, true), double_val); break;
}
}
}
}
main();
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