app_vue2/services/dataProvider/dataProvider.ts

import { Context } from '@nuxt/types/app'
import { AnyJson, DataProviderArgs } from '~/types/interfaces'
import { DENORMALIZER_TYPE, HTTP_METHOD, QUERY_TYPE } from '~/types/enums'
import { providers } from '~/services/dataProvider/provider/_import'
import ConstructUrl from '~/services/connection/constructUrl'
import Connection from '~/services/connection/connection'
import Serializer from '~/services/serializer/serializer'
import ApiError from '~/services/utils/apiError'

class DataProvider {
  private ctx !: Context;
  private defaultArguments!: DataProviderArgs;

  constructor () {
    this.defaultArguments = {
      type: QUERY_TYPE.MODEL,
      progress: false
    }
  }

  initCtx (ctx:Context) {
    Connection.initConnector(ctx.$axios)
    this.ctx = ctx
  }

  getArguments (args: DataProviderArgs): DataProviderArgs {
    return { ...this.defaultArguments, ...args }
  }

  async invoke (args:DataProviderArgs): Promise<any> {
    try {
      const dpArgs = this.getArguments(args)

      this.startLoading(dpArgs)

      const url = this.constructUrl(dpArgs)

      const response = await this.connection(url, dpArgs)

      const deserializeResponse = await this.deserialization(response)

      return await this.provide(deserializeResponse, dpArgs)
    } catch (error) {
      throw new ApiError(500, error)
    }
  }

  startLoading (args: DataProviderArgs) {
    if (args.progress) {
      const $nuxt = window.$nuxt
      $nuxt.$loading.start()
    }
  }

  constructUrl (args: DataProviderArgs): string {
    const constructUrl = new ConstructUrl()
    return constructUrl.invoke(args)
  }

  connection (url: string, args: DataProviderArgs): Promise<any> {
    const connection = new Connection()
    return connection.invoke(HTTP_METHOD.GET, url, args)
  }

  provide (data: AnyJson, args: DataProviderArgs): any {
    for (const provider of providers) {
      if (provider.support(args)) {
        return new provider(this.ctx, args).invoke(data)
      }
    }
  }

  deserialization (data: AnyJson): AnyJson {
    const serializer = new Serializer()
    return serializer.denormalize(data, DENORMALIZER_TYPE.HYDRA)
  }
}

export default DataProvider