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Auteur: Amir Taaki
Datum:  
Aan: libbitcoin
Onderwerp: Re: [Libbitcoin] Direct websockets server
When do we think the new server could be ready for darkwallet?
What's the blockers?
I will ask to push back release if it could be a reasonable timeframe.
Although we should have beta already (the delay is partly my fault).

On 11/07/2014 12:23 AM, Amir Taaki wrote:
> I don't mind that, the benefit though to direct native websockets
> integration is less copying and re-serialising which is more efficient.
> The intermediate step isn't necessary when we have the libbitcoin API
> directly.
>
> The Python gateway right now is very crappy since it's essentially
> single-threaded blocking translator (in Python). It stops working often.
> Something direct and integrated (in C++) would be more efficient and stable.
>
> On 11/07/2014 12:18 AM, Eric Voskuil wrote:
>> Yes, gotta provide web-friendly protocol and serializations!
>>
>> We can easily layer web sockets over ZMQ. That gets us into the browser.
>> websocketpp sounds good, but I haven't looked closely.
>>
>> The next question is wire protocol. Using a client-side js lib the
>> protobuf messages can be made accessible. ProtoBuf.js looks good there,
>> but again haven't looked closely.
>>
>> We also have the option to map the wire protocol on the server to JSON,
>> between websockets and ZMQ. This is also relatively straightforward -
>> see pb2json.
>>
>> The harder part is getting the server up under the new/privacy protocol
>> (libbitticoin-protocol). However that task is under way.
>>
>> In the mean time someone could take this up over obelisk
>> (current/updated protocol). That just means leaving out the protobuf
>> step, which means manually mapping the ZMQ messages to JSON behind
>> websocketpp. Seems like a good path for the DarkWallet folks.
>>
>> e
>>
>> On 11/06/2014 11:30 AM, William Swanson wrote:
>>> Yes, we definitely need websockets!
>>>
>>> This last weekend, I went to the Bay Area to help mentor a Hackathon.
>>> The hackathon had over a hundred students, and they produced about 14
>>> projects. Unfortunately, every single project, without exception,
>>> relied on a centralized blockchain API like CoinBase or
>>> Blockchain.info. This is not good! Companies like CoinBase are rapidly
>>> turning into the new banking establishment, destroying the
>>> decentralization we have worked so hard to achieve.
>>>
>>> If we want to reverse this trend, we need some easy-to-use,
>>> web-compatible Blockchain data server to compete with these
>>> proprietary services. The libbitcoin-node project can certainly
>>> provide this, but not over ZeroMQ. Websockets are our best hope.
>>>
>>> -William
>>>
>>> On Thu, Nov 6, 2014 at 11:11 AM, Amir Taaki <genjix@???> wrote:
>>>> I've been playing today with websocketpp, which only depends on boost
>>>> and is still actively developed.
>>>> It's simple to use and asynchronous (based off boost ASIO) which makes
>>>> it ideal.
>>>>
>>>> Here's what I used on Ubuntu 13.10 to compile it:
>>>>
>>>> export BOOST_INCLUDES=/usr/include/
>>>> export BOOST_LIBS=/usr/lib/x86_64-linux-gnu/
>>>> scons
>>>> cd build/release/echo_server/
>>>> ./echo_server
>>>>
>>>> In another terminal window:
>>>>
>>>> sudo pip install websocket-client
>>>>
>>>> Create test.py and run it:
>>>>
>>>> from websocket import create_connection
>>>> ws = create_connection("ws://localhost:9002/")
>>>> print "Sending 'Hello, World'..."
>>>> ws.send("Hello, World")
>>>> print "Sent"
>>>> print "Reeiving..."
>>>> result = ws.recv()
>>>> print "Received '%s'" % result
>>>> ws.close()
>>>>
>>>> Other options:
>>>>
>>>> * QtWebSockets - not sure where it's used or how well developed it is.
>>>> * libwebsockets - "lightweight pure C library built to use minimal CPU
>>>> and memory resources, and provide fast throughput in both directions."
>>>>
>>>> libwebsockets seems very cool, especially the zero-copy write but it
>>>> looks more complex to use:
>>>> http://git.libwebsockets.org/cgi-bin/cgit/libwebsockets/tree/test-server/test-echo.c
>>>>
>>>> here's websocketpp for comparison:
>>>> https://github.com/zaphoyd/websocketpp/blob/master/examples/echo_server/echo_server.cpp
>>>>
>>>> websocketpp should be easy to natively integrate as a transport into
>>>> libbitcoin-server.
>>>>
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>>
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