Define Map in golang like glow? about gleam HOT 11 CLOSED

from gleam.

Okay, thank you! I appreciate the work and the quick response.

from gleam.

Please let me know the use case you have in mind.

from gleam.

No problem. Basically what I want to do is something like this:

    flow.New().Source(
         // stream of protobuf messages
    ).Map(
         // demarshal protobuf
    ).Filter(
        // ...
    ).Map(
        // protobuf to json
    ).Map(
        // store into redis 
    ).Run()

AFAIK, to do the above in gleam I'd need some external programs or I'd need to write the logic in Lua. Both of these options create additional dependencies (e.g. a redis client library for lua or having to ship these additional binaries).

from gleam.

gleam can automatically ship the binaries to the remote agents for each program, same as glow. This piece of function is not turned on at this moment, but should be fairly easy to do.

from gleam.

Do you mean it'd be easy to allow "mappers" to be written in go again, and that you'd just have to ship the binary from the driver like in glow? That'd be awesome. Glow handles my use case well right now but I would like to eventually upgrade to Gleam to take advantage of all the improvements.

Anyhow, thanks for the consideration/time.

from gleam.

I added an example to use Go code. It is not super nice since it is not that straight forward, but it can get the job done to run mapper in pure Go code.

See https://github.com/chrislusf/gleam/tree/master/examples/word_count_in_go

I am going to add more documentation tomorrow.

from gleam.

Awesome! Nice that you still have a way to distribute go code. As you say, it looks a bit cumbersome at least relative to doing the same in Glow, but it does handle my use case. I'm currently prototyping a project using Glow, I'll try to adapt it to Gleam and report back.

from gleam.

documentation is here https://github.com/chrislusf/gleam/wiki/Write-Mapper-Reducer-in-Go

from gleam.

I changed the implementation overnight. Please check example and documentation again. Now it is one single binary. Just need to register the mapper or reducer at the beginning of the main program.

from gleam.

That looks a lot more convenient! I'll try to give it a spin this week.

from gleam.