[exemple] Create simple client, like in demo

[dawadam]

Hi, thanks for this great library.
I hope understand to use it. ;-)

I'm trying create exemple like in demo, but it seem complex.

Is it possible to create single client, from configuration json file ?
Or create IJsFixConfig object from json file ?

I'm just trying to create client fix session, but i'm stuck.

class FixTest extends AsciiSession {
    constructor(public readonly config: IJsFixConfig) {
        super(config)
    }
    
    // methods extends
    // [...]
}

const fixTest = new FixTest([...]) // I need to create the configuration object

[dawadam]

I'm trying to create like this :

    // configuration
    const sessionDescription: ISessionDescription = require('./jspurefix-test-initiator.json')
    const definitions: FixDefinitions = await new DefinitionFactory().getDefinitions('data/fix_repo/FIX.4.4/Base')
    const config: IJsFixConfig = new JsFixConfig(null, definitions, sessionDescription, AsciiChars.Pipe)

    // session instance
    const fixTest = new FixTest(config)

But ascii-parser error : Cannot read properties of undefined (reading 'resolve')

[TimelordUK]

the problem is under covers there are objects that need to be constructed each using the config object so config is created and then injected to the other objects.

the demo uses a stubed server just to show messages being sent but this is not needed

you cant really strip it down mch more than below as you have to return your session object into the DI container so it is sitting alongside all other objects such as parser sender buffer and so on.

this can be placed essentially in your startup the entire rest of your application can work as you like including the implentation of the FixTest

it has been many months since I looked in detail at this project but initialising everything is actually quite complex as there is a lot to construct which is why eventually dependency injection was used so each object has its dependencies created including the config object.

import 'reflect-metadata'

import { TradeCaptureClient } from './trade-capture-client'
import { EngineFactory, IJsFixConfig, SessionLauncher } from 'jspurefix'

class AppLauncher extends SessionLauncher {
  public constructor (client: string = '../../test-initiator.json') {
    super(client)
    this.root = __dirname
  }

  protected override makeFactory (config: IJsFixConfig): EngineFactory {
    return {
      makeSession: () => new FixTest (config)
    } as EngineFactory
  }
}

const l = new AppLauncher()
l.exec()

[TimelordUK]

there is also https://github.com/TimelordUK/jspf-md-demo

whch uses commad line to optionally add in a server along with other paramaters

this has 2 methods of stating either using a DI container or something like aboev - it also shows how you can add your own web service into the initialisation

it may provide a different start point - once you know which way you want to initialise the other code can be remoed as youu only need one - this is dictated by the command line.

e.g.

cd dist/app && node app --port 3000 --server ../../data/session/test-acceptor.json

❯ cd dist/app && node app --port 3000 --server ../../data/session/test-acceptor.json
port: 3000, DI: using factory
2023-08-27T14:31:10.144Z [launcher] info: launching ..
2023-08-27T14:31:10.148Z [launcher] info: creating app test_server [protocol ascii]
2023-08-27T14:31:10.206Z [launcher] info: creating app test_client [protocol ascii]
2023-08-27T14:31:10.207Z [launcher] info: launching ....
2023-08-27T14:31:11.741Z [launcher] info: create initiator
2023-08-27T14:31:11.742Z [initiator] info: create session with DI Token FixSession
2023-08-27T14:31:11.864Z [initiator] info: connecting ...
2023-08-27T14:31:11.865Z [test_client:TcpInitiator] info: connecting with timeout 22
2023-08-27T14:31:11.867Z [test_client:TcpInitiator] info: unsecureDuplex try to connect to endPoint
2023-08-27T14:31:11.878Z [test_client:TcpInitiator] info: tryConnect localhost:2344
2023-08-27T14:31:11.880Z [launcher] info: create acceptor
2023-08-27T14:31:11.885Z [acceptor] info: starting.
2023-08-27T14:31:11.886Z [test_server:TcpAcceptor] info: create unsecured server
2023-08-27T14:31:11.887Z [test_server:TcpAcceptor] info: start to listen 2344
2023-08-27T14:31:11.893Z [test_client:TcpInitiator] info: net.createConnection cb, resolving
txt

[dawadam]

Thank you for the quick reply.
I find the implementation is big, I imagine, that there was not much choice.
Anyway it seems to work, I'm trying.
I risk making requests or proposals for improvement if I encounter problems.
Sorry in advance to bring you back to look at the library. ;)