55 lines
1.1 KiB
Go
55 lines
1.1 KiB
Go
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package main
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import (
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"encoding/json"
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"fmt"
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"log"
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"net/http"
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"git.tuxpa.in/a/lambda"
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"git.tuxpa.in/a/lambda/parallel"
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)
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type RequestContext[T any] struct {
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req http.Request
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ans T
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err error
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}
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func (r *RequestContext[T]) String() string {
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return fmt.Sprintf("%+v", r.ans)
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}
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func do[T any](r *RequestContext[T]) *RequestContext[T] {
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r.ans = *new(T)
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res, err := http.DefaultClient.Do(&r.req)
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if err != nil {
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r.err = err
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return r
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}
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defer res.Body.Close()
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r.err = json.NewDecoder(res.Body).Decode(&r.ans)
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return r
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}
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type someResult struct {
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Title string `json:"title"`
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Id int `json:"id"`
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}
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func main() {
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var requests = make([]*RequestContext[someResult], 20)
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for i := range requests {
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r, _ := http.NewRequest("GET", fmt.Sprintf("https://jsonplaceholder.typicode.com/todos/%d", i+1), nil)
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requests[i] = &RequestContext[someResult]{
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req: *r,
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}
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}
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results := lambda.Filter(parallel.Map(requests, do[someResult], 4), func(r *RequestContext[someResult]) bool {
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return r.err == nil
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})
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for _, v := range results {
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log.Printf("%s", v)
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}
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}
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