How I can trigger the api reading via using a queue? - api

Question

In my application I consume an api that receives data from a serial port:
import 'package:http/http.dart' as http;
import 'package:flutter_libserialport/flutter_libserialport.dart';
class SerialRead {
final SerialPort port;
final Api api;
SerialRead(this.port,this.api);
void read(){
if (!port.openReadWrite()) {
print(SerialPort.lastError);
exit(-1);
}
final reader = SerialPortReader(port);
reader.stream.listen((data) {
api.consume(data);
});
}
}
class Api
{
final String __base_url = "https://example.com";
final dynamic _client;
final String username;
final String password;
Api(this.username,this.password): _client=http.Client();
Fitire<void> consume(var data) async {
final Uri url = Uri.parse(__base_url + "/serial_data");
var response = await _client.post(url,[
'X-username': username,
'X-password': password
],body:data);
// Handle response here
}
}
void main(){
final Api api = Api('chuck','norris');
final SerialRead read = SerialRead('/dev/ttyACM0',api);
read.read();
}
The code above it may read and consume the data but it may be cases where too many requests are performed upon the api, that it may trigger 429 too many requests. In order to avoid I want somehow to requlate the rate I perform the http calls.
As a means to do it is to use the retry library https://pub.dev/packages/retry but if I do retry I may lose some data that has been read upon serial.
Therefore, during reading I want to enqueue it into a FiFO queue and via a seperate thread to consume the api:
import 'package:http/http.dart' as http;
import 'package:flutter_libserialport/flutter_libserialport.dart';
final Queue<dynamic> queue = Queue<dynamic>();
class SerialRead {
final SerialPort port;
SerialRead(this.port);
void read(){
if (!port.openReadWrite()) {
print(SerialPort.lastError);
exit(-1);
}
final reader = SerialPortReader(port);
reader.stream.listen((data) {
values.addLast(data);
});
}
}
class Api
{
final String __base_url = "https://example.com";
final dynamic _client;
final String username;
final String password;
Api(this.username,this.password): _client=http.Client();
void consume(){
final dynamic data = queue.removeFirst();
// For simplicity I ommit checks
final Uri url = Uri.parse(__base_url + "/serial_data");
var response = await _client.post(url,[
'X-username': username,
'X-password': password
],body:data);
// Handle response here
}
}
void main(){
final Api api = Api('chuck','norris');
final SerialRead read = SerialRead('/dev/ttyACM0',api);
// Somehow trigger the api Reading
}
In the example above how I can in some sort of seperate thread trigger the consume method at api Class?