CODEWITHSUNDEEP
flutterdart
Daniel Christensen
Daniel Christensen

Reputation: 17

Ways of making my flutter app faster at fetching from api

I am wondering if there are faster ways of doing this fetch, the for loop currently takes approx 10s but it's waiting for each fetch to finish before starting on the next one I also tried a forEach loop but then I had issues with the responses array being empty. Is there any smart Dart way of fetching it faster then returning the array to flamingotest

Here is my code!

import 'package:http/http.dart' as http;
import 'dart:convert';
import '../classes/flamingo_test.dart';
import '../classes/convert_wallet.dart' as walletfunc;
import 'package:flutter_settings_screens/flutter_settings_screens.dart';
import '../utilities/assets.dart' as assets; // Object of assets

Future<FlamingoTest> fetchPost() async {
  String apiUrl = "xxxxxx";

  var responses = [];

  for (var mapEntry in assets.assets.entries) {
    var wallet = Settings.getValue<String>("user-wallet", "");

    print(wallet);

    var userWalletSeed = walletfunc.convertWallet(wallet);

    print(userWalletSeed);

    var body = json.encode({
      "jsonrpc": "2.0",
      "method": "invokefunction",
      "params": [
        "4d92194e8d73980dadbadfc1993b2014c9fbd9da",
        "checkFLM",
        [
          {"type": "Hash160", "value": userWalletSeed},
          {"type": "Hash160", "value": mapEntry.value}
        ]
      ],
      "id": 3
    });

    Map<String, String> headers = {
      'Content-type': 'application/json',
      'Accept': 'application/json',
    };

    var response =
        await http.post(Uri.parse(apiUrl), body: body, headers: headers);

    print(response);

    if (response.statusCode == 200) {
      print(response);

      var uncoded = jsonDecode(response.body);

      responses.add(uncoded);
    } else {
      throw Exception('Failed to load post');
    }
  }

  return new FlamingoTest.fromJson(responses);
}

Upvotes: 1

Views: 1220

Answers (1)

Calvin Gonsalves
Calvin Gonsalves

Reputation: 2020

You can use Future.wait like this. The map will return a Iterable of Future<Response> and perform the post simultaneously.

Future<Response> fetchResponse(var mapEntryValue) async {
    //The code in your for-loop goes here
...
    
    return response;
}


Future<FlamingoTest> fetchPost() async { 

    var responses = [];
    
    await Future.wait(
        assets.assets.entries
            .map<Future<Response>>(
              (MapEntry me) => fetchResponse(me.value),
            )
            .toList(),
      ).then((listOfResponses) {
        responses.addAll(listOfResponses);
      });
    
    return new FlamingoTest.fromJson(responses);

 
}

Upvotes: 2

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