passing flatbuffers from C to duktape javascript

Wondering if anyone out there has had any success or attempted to integrate flatbuffers with duktape, so far I can only get about 1/2 way there...

I can push a flatbuffer from C, and access it from JS with the following code, and it seems to work perfectly:

duk_push_heapptr(ctx, t->ptr);

duk_push_external_buffer(ctx);

duk_config_buffer(ctx, -1, d.data, d.length);

duk_call(ctx, 1);

However, i cant quite seem to achieve the same success passing a flatbuffer from JS to C (or C++ in my case):

void * buff;

duk_size_t sz;

buff = duk_require_buffer_data(ctx, 1, &sz);

if (VerifyLogEventBuffer(flatbuffers::Verifier((uint8_t *)buff, (unsigned int)sz))) {

    std::cout << "Buffer is good here!" << std::endl;

} else {

std::cout << "Buffer is broken here even" << std::endl;

}

Any ideas what i could be doing wrong here? No issues compiling, but the the flatbuffer is unreadable.

Edit: I should also include the relevant JS --

        var fbb = new flatbuffers.Builder(1024);



    PGS.Buffers.LogEvent.startLogEvent(fbb);

    PGS.Buffers.LogEvent.addLevel(fbb,'WARN');

    PGS.Buffers.LogEvent.addSource(fbb,"js");

    PGS.Buffers.LogEvent.addText(fbb,"1 Event Emitted from JS now with a very long text string to make sure our buffer size increases.");

    var toEmit = PGS.Buffers.LogEvent.endLogEvent(fbb);

    PGS.Buffers.LogEvent.finishLogEventBuffer(fbb, toEmit);



   // var b = new Buffer(fbb.asUint8Array());

    print("1 Attempting to raise long log event using dataBuffer and Buffer");

    raise('log', new Buffer(fbb.asUint8Array()));

edited Jan 19 at 5:22

asked Jan 19 at 2:47

Davin Thompson

add a comment |

Wondering if anyone out there has had any success or attempted to integrate flatbuffers with duktape, so far I can only get about 1/2 way there...

I can push a flatbuffer from C, and access it from JS with the following code, and it seems to work perfectly:

duk_push_heapptr(ctx, t->ptr);

duk_push_external_buffer(ctx);

duk_config_buffer(ctx, -1, d.data, d.length);

duk_call(ctx, 1);

However, i cant quite seem to achieve the same success passing a flatbuffer from JS to C (or C++ in my case):

void * buff;

duk_size_t sz;

buff = duk_require_buffer_data(ctx, 1, &sz);

if (VerifyLogEventBuffer(flatbuffers::Verifier((uint8_t *)buff, (unsigned int)sz))) {

    std::cout << "Buffer is good here!" << std::endl;

} else {

std::cout << "Buffer is broken here even" << std::endl;

}

Any ideas what i could be doing wrong here? No issues compiling, but the the flatbuffer is unreadable.

Edit: I should also include the relevant JS --

        var fbb = new flatbuffers.Builder(1024);



    PGS.Buffers.LogEvent.startLogEvent(fbb);

    PGS.Buffers.LogEvent.addLevel(fbb,'WARN');

    PGS.Buffers.LogEvent.addSource(fbb,"js");

    PGS.Buffers.LogEvent.addText(fbb,"1 Event Emitted from JS now with a very long text string to make sure our buffer size increases.");

    var toEmit = PGS.Buffers.LogEvent.endLogEvent(fbb);

    PGS.Buffers.LogEvent.finishLogEventBuffer(fbb, toEmit);



   // var b = new Buffer(fbb.asUint8Array());

    print("1 Attempting to raise long log event using dataBuffer and Buffer");

    raise('log', new Buffer(fbb.asUint8Array()));

edited Jan 19 at 5:22

asked Jan 19 at 2:47

Davin Thompson

add a comment |

Wondering if anyone out there has had any success or attempted to integrate flatbuffers with duktape, so far I can only get about 1/2 way there...

I can push a flatbuffer from C, and access it from JS with the following code, and it seems to work perfectly:

duk_push_heapptr(ctx, t->ptr);

duk_push_external_buffer(ctx);

duk_config_buffer(ctx, -1, d.data, d.length);

duk_call(ctx, 1);

However, i cant quite seem to achieve the same success passing a flatbuffer from JS to C (or C++ in my case):

void * buff;

duk_size_t sz;

buff = duk_require_buffer_data(ctx, 1, &sz);

if (VerifyLogEventBuffer(flatbuffers::Verifier((uint8_t *)buff, (unsigned int)sz))) {

    std::cout << "Buffer is good here!" << std::endl;

} else {

std::cout << "Buffer is broken here even" << std::endl;

}

Any ideas what i could be doing wrong here? No issues compiling, but the the flatbuffer is unreadable.

Edit: I should also include the relevant JS --

        var fbb = new flatbuffers.Builder(1024);



    PGS.Buffers.LogEvent.startLogEvent(fbb);

    PGS.Buffers.LogEvent.addLevel(fbb,'WARN');

    PGS.Buffers.LogEvent.addSource(fbb,"js");

    PGS.Buffers.LogEvent.addText(fbb,"1 Event Emitted from JS now with a very long text string to make sure our buffer size increases.");

    var toEmit = PGS.Buffers.LogEvent.endLogEvent(fbb);

    PGS.Buffers.LogEvent.finishLogEventBuffer(fbb, toEmit);



   // var b = new Buffer(fbb.asUint8Array());

    print("1 Attempting to raise long log event using dataBuffer and Buffer");

    raise('log', new Buffer(fbb.asUint8Array()));

edited Jan 19 at 5:22

asked Jan 19 at 2:47

Davin Thompson

Wondering if anyone out there has had any success or attempted to integrate flatbuffers with duktape, so far I can only get about 1/2 way there...

I can push a flatbuffer from C, and access it from JS with the following code, and it seems to work perfectly:

duk_push_heapptr(ctx, t->ptr);

duk_push_external_buffer(ctx);

duk_config_buffer(ctx, -1, d.data, d.length);

duk_call(ctx, 1);

However, i cant quite seem to achieve the same success passing a flatbuffer from JS to C (or C++ in my case):

void * buff;

duk_size_t sz;

buff = duk_require_buffer_data(ctx, 1, &sz);

if (VerifyLogEventBuffer(flatbuffers::Verifier((uint8_t *)buff, (unsigned int)sz))) {

    std::cout << "Buffer is good here!" << std::endl;

} else {

std::cout << "Buffer is broken here even" << std::endl;

}

Any ideas what i could be doing wrong here? No issues compiling, but the the flatbuffer is unreadable.

Edit: I should also include the relevant JS --

        var fbb = new flatbuffers.Builder(1024);



    PGS.Buffers.LogEvent.startLogEvent(fbb);

    PGS.Buffers.LogEvent.addLevel(fbb,'WARN');

    PGS.Buffers.LogEvent.addSource(fbb,"js");

    PGS.Buffers.LogEvent.addText(fbb,"1 Event Emitted from JS now with a very long text string to make sure our buffer size increases.");

    var toEmit = PGS.Buffers.LogEvent.endLogEvent(fbb);

    PGS.Buffers.LogEvent.finishLogEventBuffer(fbb, toEmit);



   // var b = new Buffer(fbb.asUint8Array());

    print("1 Attempting to raise long log event using dataBuffer and Buffer");

    raise('log', new Buffer(fbb.asUint8Array()));

flatbuffers duktape

edited Jan 19 at 5:22

asked Jan 19 at 2:47

Davin Thompson

edited Jan 19 at 5:22

asked Jan 19 at 2:47

Davin Thompson

edited Jan 19 at 5:22

asked Jan 19 at 2:47

Davin Thompson

asked Jan 19 at 2:47

Davin Thompson

asked Jan 19 at 2:47

Davin Thompson

add a comment |

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