Javascript / Node.js wrapper or library
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Stefan Schmelz
Feb 28, 2021, 6:19:10 PM2/28/21
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Hi, I want to integrate a nodejs application with ola. Do you know of a library or a wrapper around the sreaming client? I would prefer not making my own.
Thanks Stefan
Jannis Achstetter
Mar 1, 2021, 10:06:23 AM3/1/21
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Hi Stefan,
I don't think that anyone did this yet but I like the idea.
Of course it's easy to access the data via HTTP calls but I assume you
need something more real-time since you already mentioned the streaming
client.
I could think of two easy (= hacky) ways to achieve what you plan to do:
- Using a NodeJS Protobuf-Library and the proto-file from OLA. Then,
connect to your OLA instance (port 9010 by default, only listening on
127.0.0.1). Then you are talking to OLA like another client via Protobuf
- Use some kind of Node FFI (Foreign Function Interface, such as
https://www.npmjs.com/package/ffi-napi) to hook the OLA client library
and call functions of this library then
Best regards,
Jannis
Am 01.03.21 um 00:19 schrieb Stefan Schmelz:
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I don't think that anyone did this yet but I like the idea.
Of course it's easy to access the data via HTTP calls but I assume you
need something more real-time since you already mentioned the streaming
client.
I could think of two easy (= hacky) ways to achieve what you plan to do:
- Using a NodeJS Protobuf-Library and the proto-file from OLA. Then,
connect to your OLA instance (port 9010 by default, only listening on
127.0.0.1). Then you are talking to OLA like another client via Protobuf
- Use some kind of Node FFI (Foreign Function Interface, such as
https://www.npmjs.com/package/ffi-napi) to hook the OLA client library
and call functions of this library then
Best regards,
Jannis
Am 01.03.21 um 00:19 schrieb Stefan Schmelz:
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Peter Newman
Mar 1, 2021, 11:54:58 AM3/1/21
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Hi Stefan,
Someone did this:
But it only supports sending DMX.
Do you just want to send, or receive too?
On Monday, 1 March 2021 at 15:06:23 UTC Kripton wrote:
Hi Stefan,
I don't think that anyone did this yet but I like the idea.
Of course it's easy to access the data via HTTP calls but I assume you
need something more real-time since you already mentioned the streaming
client.
I could think of two easy (= hacky) ways to achieve what you plan to do:
- Using a NodeJS Protobuf-Library and the proto-file from OLA. Then,
connect to your OLA instance (port 9010 by default, only listening on
127.0.0.1). Then you are talking to OLA like another client via Protobuf
See http://docs.openlighting.org/ola/doc/latest/rpc_system.html for more detail
Peter Newman
Mar 1, 2021, 11:56:23 AM3/1/21
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Stefan Schmelz
Mar 1, 2021, 12:10:42 PM3/1/21
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Okay, the description of this package looked like it was a different thing.
But thangs very much for your reply
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Stefan Schmelz
Mar 1, 2021, 12:12:26 PM3/1/21
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I should have looked at the github discussion first....
I only looked at the official docs. There was no mention of nodejs.
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Jannis Achstetter
Mar 1, 2021, 3:18:48 PM3/1/21
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I had a brief look at it and it seems to be a wrapper around the HTTP
API (see
https://github.com/tfitschen/ola_node/blob/master/lib/dmx.coffee#L12).
While that works, it won't be performant.
Since Stefan was asking about the streaming client, I assume that
polling won't do the job for him.
Best regards,
Jannis
Am 01.03.21 um 17:54 schrieb Peter Newman:
> <https://groups.google.com/d/msgid/open-lighting/9f9b396c-dd73-4903-95d7-d84764483416n%40googlegroups.com?utm_medium=email&utm_source=footer>>.
> <https://groups.google.com/d/msgid/open-lighting/7d8e3616-72b0-4347-bc5e-df352ba20d10n%40googlegroups.com?utm_medium=email&utm_source=footer>.
API (see
https://github.com/tfitschen/ola_node/blob/master/lib/dmx.coffee#L12).
While that works, it won't be performant.
Since Stefan was asking about the streaming client, I assume that
polling won't do the job for him.
Best regards,
Jannis
Am 01.03.21 um 17:54 schrieb Peter Newman:
> Hi Stefan,
>
> Someone did this:
> https://github.com/tfitschen/ola_node
>
> But it only supports sending DMX.
>
> Do you just want to send, or receive too?
>
> On Monday, 1 March 2021 at 15:06:23 UTC Kripton wrote:
>
> Hi Stefan,
>
> I don't think that anyone did this yet but I like the idea.
> Of course it's easy to access the data via HTTP calls but I assume you
> need something more real-time since you already mentioned the streaming
> client.
>
> I could think of two easy (= hacky) ways to achieve what you plan to
> do:
> - Using a NodeJS Protobuf-Library and the proto-file from OLA. Then,
> connect to your OLA instance (port 9010 by default, only listening on
> 127.0.0.1). Then you are talking to OLA like another client via Protobuf
>
>
> See http://docs.openlighting.org/ola/doc/latest/rpc_system.html for more
> detail
>
>
> - Use some kind of Node FFI (Foreign Function Interface, such as
> https://www.npmjs.com/package/ffi-napi
> <https://www.npmjs.com/package/ffi-napi>) to hook the OLA client
>
> Someone did this:
> https://github.com/tfitschen/ola_node
>
> But it only supports sending DMX.
>
> Do you just want to send, or receive too?
>
> On Monday, 1 March 2021 at 15:06:23 UTC Kripton wrote:
>
> Hi Stefan,
>
> I don't think that anyone did this yet but I like the idea.
> Of course it's easy to access the data via HTTP calls but I assume you
> need something more real-time since you already mentioned the streaming
> client.
>
> I could think of two easy (= hacky) ways to achieve what you plan to
> do:
> - Using a NodeJS Protobuf-Library and the proto-file from OLA. Then,
> connect to your OLA instance (port 9010 by default, only listening on
> 127.0.0.1). Then you are talking to OLA like another client via Protobuf
>
>
> See http://docs.openlighting.org/ola/doc/latest/rpc_system.html for more
> detail
>
>
> - Use some kind of Node FFI (Foreign Function Interface, such as
> https://www.npmjs.com/package/ffi-napi
> library
> and call functions of this library then
>
> Best regards,
> Jannis
>
>
> Am 01.03.21 um 00:19 schrieb Stefan Schmelz:
> >
> > Hi, I want to integrate a nodejs application with ola. Do you know
> of a
> > library or a wrapper around the sreaming client? I would prefer not
> > making my own.
> >
> >
> > Thanks Stefan
> >
> > --
> > The Open Lighting Project: open-l...@googlegroups.com, #openlighting
> > (irc.freenode.org <http://irc.freenode.org>)
> and call functions of this library then
>
> Best regards,
> Jannis
>
>
> Am 01.03.21 um 00:19 schrieb Stefan Schmelz:
> >
> > Hi, I want to integrate a nodejs application with ola. Do you know
> of a
> > library or a wrapper around the sreaming client? I would prefer not
> > making my own.
> >
> >
> > Thanks Stefan
> >
> > --
> > The Open Lighting Project: open-l...@googlegroups.com, #openlighting
> > To unsubscribe from this group, send email to
> > open-lightin...@googlegroups.com
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> >
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>
> >
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>
>
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Stefan Schmelz
Mar 1, 2021, 3:23:16 PM3/1/21
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Jannis, you are absolutely right. I would like to use it for Realtime applications. Despite Javascript being very slow.
Stefan Schmelz <sschm...@gmail.com> schrieb am Mo., 1. März 2021, 00:19:
Hi, I want to integrate a nodejs application with ola. Do you know of a library or a wrapper around the sreaming client? I would prefer not making my own.Thanks Stefan
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Jannis Achstetter
Mar 1, 2021, 5:58:04 PM3/1/21
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Nice, little evening challenge solved:
https://github.com/kripton/node-ola-protobuf
It's not a "library", more a kind of example. It's not doing exemplary
error handling and I didn't test it for performance. It might be useful
to you, or it might not be :)
DMX data is available after being updated here:
https://github.com/kripton/node-ola-protobuf/blob/main/index.ts#L71
It seems that the docs need a little update:
https://docs.openlighting.org/ola/doc/latest/rpc_system.html#rpc_SimpleExample
does not contain the "4 byte RPC header"
(https://docs.openlighting.org/ola/doc/latest/rpc_system.html#rpc_RPCHeader)
at all.
Best regards,
Jannis
Am 01.03.21 um 21:23 schrieb Stefan Schmelz:
> (irc.freenode.org <http://irc.freenode.org>)
> <mailto:open-lighting%2Bunsu...@googlegroups.com>
> <https://groups.google.com/d/msgid/open-lighting/CAKJF573MQo2uo19teJBAGHOgD_-DLxwuzHLudurkHowzstG-BA%40mail.gmail.com?utm_medium=email&utm_source=footer>.
https://github.com/kripton/node-ola-protobuf
It's not a "library", more a kind of example. It's not doing exemplary
error handling and I didn't test it for performance. It might be useful
to you, or it might not be :)
DMX data is available after being updated here:
https://github.com/kripton/node-ola-protobuf/blob/main/index.ts#L71
It seems that the docs need a little update:
https://docs.openlighting.org/ola/doc/latest/rpc_system.html#rpc_SimpleExample
does not contain the "4 byte RPC header"
(https://docs.openlighting.org/ola/doc/latest/rpc_system.html#rpc_RPCHeader)
at all.
Best regards,
Jannis
Am 01.03.21 um 21:23 schrieb Stefan Schmelz:
> Jannis, you are absolutely right. I would like to use it for Realtime
> applications. Despite Javascript being very slow.
>
> Stefan Schmelz <sschm...@gmail.com <mailto:sschm...@gmail.com>>
> applications. Despite Javascript being very slow.
>
> schrieb am Mo., 1. März 2021, 00:19:
>
>
> Hi, I want to integrate a nodejs application with ola. Do you know
> of a library or a wrapper around the sreaming client? I would prefer
> not making my own.
>
>
> Thanks Stefan
>
> --
> The Open Lighting Project: open-l...@googlegroups.com
> <mailto:open-l...@googlegroups.com>, #openlighting
>
>
> Hi, I want to integrate a nodejs application with ola. Do you know
> of a library or a wrapper around the sreaming client? I would prefer
> not making my own.
>
>
> Thanks Stefan
>
> --
> The Open Lighting Project: open-l...@googlegroups.com
> (irc.freenode.org <http://irc.freenode.org>)
> <mailto:open-lighting%2Bunsu...@googlegroups.com>
> For more options, visit
> https://groups.google.com/groups/opt_out?hl=en
> <https://groups.google.com/groups/opt_out?hl=en>
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Peter Newman
Mar 8, 2021, 6:32:13 PM3/8/21
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Replies inline.
On Monday, 1 March 2021 at 22:58:04 UTC Kripton wrote:
Nice, little evening challenge solved:
https://github.com/kripton/node-ola-protobuf
Nice work Jannis! Looks a lot simpler than some of our code, but I guess some of that is perhaps as it's not auto-generating lots of stuff.
It's not a "library", more a kind of example. It's not doing exemplary
error handling and I didn't test it for performance. It might be useful
to you, or it might not be :)
DMX data is available after being updated here:
https://github.com/kripton/node-ola-protobuf/blob/main/index.ts#L71
It seems that the docs need a little update:
https://docs.openlighting.org/ola/doc/latest/rpc_system.html#rpc_SimpleExample
does not contain the "4 byte RPC header"
(https://docs.openlighting.org/ola/doc/latest/rpc_system.html#rpc_RPCHeader)
at all.
Well spotted, we do seem to have it on the receive side, but indeed not on the transmit side. Do you fancy doing a PR to fix it? The documentation is here:
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