package main

import (
	"encoding/json"
	"fmt"
	"log"
	"net/http"

	"git.tuxpa.in/a/lambda/parallel"
)

type someResult struct {
	Title string `json:"title"`
	Id    int    `json:"id"`
}

func main() {
	var requests = make([]*http.Request, 20)

	for i := range requests {
		r, _ := http.NewRequest("GET", fmt.Sprintf("https://jsonplaceholder.typicode.com/todos/%d", i), nil)
		requests[i] = r
	}

	results, errs := parallel.MapErrorV(requests, func(r *http.Request) (*someResult, error) {
		out := &someResult{}
		res, err := http.DefaultClient.Do(r)
		if err != nil {
			return nil, err
		}
		defer res.Body.Close()
		err = json.NewDecoder(res.Body).Decode(out)
		return out, err
	}, 4)

	for i, v := range results {
		if errs[i] != nil {
			log.Printf("err: %s", errs[i])
		} else {
			log.Printf("result: %+v", v)
		}
	}
}