opendb_test_rpc/src/client/index.ts

general purpose library for OpenDB blockchain

import debugFactory, { IDebugger } from 'debug'
import { RpcWebSocketClient } from './rpc'

export interface OpenDBClient {
  endpoint: string
  isConnected: boolean

  connect(): Promise<void>
  // TSES-lint: In call method params to change (any - unknown) for lint error
  call(method: string, params?: any): any // eslint-disable-line @typescript-eslint/no-explicit-any

  // -------TODO: Unused Function Notify
  // notify(method: string, params?: any): any
}

export default class RPCClient implements OpenDBClient {
  public endpoint: string
  public isConnected: boolean = false
  public rpc: RpcWebSocketClient

  // debugger
  private debug: IDebugger

  constructor(endpoint) {
    this.endpoint = endpoint
    this.debug = debugFactory('openDB:ws')

    this.rpc = new RpcWebSocketClient()
    this.rpc.onClose(this.reconnect)
  }

  public async connect() {
    this.debug('About to connect to remote API node ws endpoint')

    if (this.isConnected) {
      return
    }

    try {
      await this.rpc.connect(this.endpoint)
    } catch (error) {
      console.error('OpenDB API ws connectoin error', error)
      throw error
    }

    this.isConnected = true
    this.debug('Already init connection to remote endpoint')
  }
  // TSES-lint: In call method params to change (any - unknown) for lint error
  public async call(method: string, params?: unknown) {
    if (!this.isConnected && !this.endpoint) {
      this.debug('Empty endpoint and no established connection, abort sending')
      return false
    }

    this.debug('Sending message: ', JSON.stringify({ method, params }, null, 2))
    try {
      // TSES-lint: 'result' is never reassigned. Use 'const' instead
      const result = await this.rpc.call(method, params)
      return result
    } catch (error) {
      console.error('OpenDB API ws call error', error)
      throw error
    }
  }
  // -------TODO: Unused Function Notify
  // public async notify(method: string, params?: any) {
  //   if (!this.isConnected && !this.endpoint) {
  //     this.debug('Empty endpoint and no established connection, abort sending')
  //     return false
  //   }

  //   this.debug(
  //     'Sending notification: ',
  //     JSON.stringify({ method, params }, null, 2)
  //   )
  //   try {
  //     let result = await this.rpc.notify(method, params)
  //     return result
  //   } catch (error) {
  //     console.error('OpenDB API ws call error', error)
  //     throw error
  //   }
  // }

  private reconnect() {
    if (this.endpoint === undefined) {
      this.debug('No endpoint for reconnection')
      return false
    }
    return this.connect()
  }
}