shad-go/lectures/06-http/context/httpserver/handler.go

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2020-04-02 11:42:31 +00:00
package httpserver
import (
"bufio"
"fmt"
"net/http"
"os"
"time"
)
type handler struct{}
func (h handler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
ctx := r.Context()
reqTime := ctx.Value(ReqTimeContextKey{}).(time.Time)
defer func() {
fmt.Printf("handler finished in %s", time.Since(reqTime))
}()
fd, _ := os.Open("core.c")
defer fd.Close()
scanner := bufio.NewScanner(fd)
for scanner.Scan() {
select {
case <-ctx.Done():
fmt.Println(ctx.Err())
return
default:
_, _ = w.Write(scanner.Bytes())
}
}
}