fetchall exer. complete

ch1/dmfetchall/1_10.go

@@ -0,0 +1,48 @@
+package main
+
+import (
+	"fmt"
+	"io"
+	"io/ioutil"
+	"log"
+	"net/http"
+	"os"
+	"strings"
+	"time"
+)
+
+func main() {
+	start := time.Now()
+	ch := make(chan string)
+	if len(os.Args[1:]) < 1 {
+		log.Fatal("needs args")
+	}
+	for _, url := range os.Args[1:] {
+		if !strings.HasPrefix(url, "http://") {
+			url = "http://" + url
+		}
+		go fetch(url, ch)
+	}
+	for range os.Args[1:] {
+		fmt.Println(<-ch)
+	}
+	fmt.Printf("%.2fs\n", time.Since(start).Seconds())
+	main()
+}
+
+func fetch(url string, ch chan string) {
+	start := time.Now()
+	resp, err := http.Get(url)
+	if err != nil {
+		ch <- fmt.Sprint(err)
+		return
+	}
+	defer resp.Body.Close()
+	nbytes, err := io.Copy(ioutil.Discard, resp.Body)
+	if err != nil {
+		ch <- fmt.Sprint(err)
+		return
+	}
+	elapsed := time.Since(start).Seconds()
+	ch <- fmt.Sprintf("%.2fs %7d %s", elapsed, nbytes, url)
+}

ch1/dmfetchall/1_11.go

@@ -0,0 +1,54 @@
+package main
+
+import (
+	"fmt"
+	"io"
+	"io/ioutil"
+	"log"
+	"net/http"
+	"os"
+	"strings"
+	"time"
+)
+
+func main() {
+	start := time.Now()
+	ch := make(chan string)
+	if len(os.Args[1:]) < 1 {
+		log.Fatal("needs args")
+	}
+	for _, url := range os.Args[1:] {
+		if !strings.HasPrefix(url, "http://") {
+			url = "http://" + url
+		}
+		go fetch(url, ch)
+	}
+	longest := time.After(time.Duration(time.Second))
+	for range os.Args[1:] {
+		select {
+		case s := <-ch:
+			fmt.Println(s)
+		case <-longest:
+			fmt.Println("took too long")
+			break
+		}
+	}
+	fmt.Printf("%.2fs\n", time.Since(start).Seconds())
+}
+
+func fetch(url string, ch chan string) {
+	start := time.Now()
+	resp, err := http.Get(url)
+	if err != nil {
+		ch <- fmt.Sprint(err)
+		return
+	}
+	defer resp.Body.Close()
+	nbytes, err := io.Copy(ioutil.Discard, resp.Body)
+	if err != nil {
+		ch <- fmt.Sprint(err)
+		return
+	}
+	elapsed := time.Since(start).Seconds()
+	ch <- fmt.Sprintf("%.2fs %7d %s", elapsed, nbytes, url)
+}

ch1/dmfetchall/main.go

@@ -0,0 +1,47 @@
+package main
+
+import (
+	"fmt"
+	"io"
+	"io/ioutil"
+	"log"
+	"net/http"
+	"os"
+	"strings"
+	"time"
+)
+
+func main() {
+	start := time.Now()
+	ch := make(chan string)
+	if len(os.Args[1:]) < 1 {
+		log.Fatal("needs args")
+	}
+	for _, url := range os.Args[1:] {
+		if !strings.HasPrefix(url, "http://") {
+			url = "http://" + url
+		}
+		go fetch(url, ch)
+	}
+	for range os.Args[1:] {
+		fmt.Println(<-ch)
+	}
+	fmt.Printf("%.2fs\n", time.Since(start).Seconds())
+}
+
+func fetch(url string, ch chan string) {
+	start := time.Now()
+	resp, err := http.Get(url)
+	if err != nil {
+		ch <- fmt.Sprint(err)
+		return
+	}
+	defer resp.Body.Close()
+	nbytes, err := io.Copy(ioutil.Discard, resp.Body)
+	if err != nil {
+		ch <- fmt.Sprint(err)
+		return
+	}
+	elapsed := time.Since(start).Seconds()
+	ch <- fmt.Sprintf("%.2fs %7d %s", elapsed, nbytes, url)
+}