persistently, patiently, you are bound to succeed

000-aq-json-01/main.go

@@ -0,0 +1,24 @@
+package main
+
+import (
+	"fmt"
+	"log"
+	"net/http"
+)
+
+// curl -i https://api.github.com/users/GoesToEleven
+
+func main() {
+	resp, err := http.Get("https://api.github.com/users/GoesToEleven")
+	if err != nil {
+		log.Fatalf("error getting request: %s", err)
+	}
+	defer resp.Body.Close()
+
+	ct := resp.Header.Get("Content-Type")
+	fmt.Println(ct)
+
+	fmt.Println(resp.Header.Get("server"))
+	fmt.Println(resp.Header.Get("date"))
+	fmt.Printf("%#v", resp.Header.Get("content-length"))
+}

000-aq-json-02/main.go

@@ -0,0 +1,26 @@
+package main
+
+import (
+	"io"
+	"log"
+	"net/http"
+	"os"
+)
+
+// curl -i -H 'User-Agent: go' https://api.github.com/users/GoesToEleven
+
+func main() {
+	resp, err := http.Get("https://api.github.com/users/GoesToEleven")
+	if err != nil {
+		log.Fatalf("error getting request: %s", err)
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode != http.StatusOK {
+		log.Fatalf("error: %s", resp.Status)
+	}
+
+	if _, err := io.Copy(os.Stdout, resp.Body); err != nil {
+		log.Fatalf("error - unable to copy: %s", err)
+	}
+}

000-aq-json-03-decode/main.go

@@ -0,0 +1,37 @@
+package main
+
+import (
+	"encoding/json"
+	"fmt"
+	"log"
+	"net/http"
+)
+
+// serialization: json, xml, csv, protobuffers
+
+func main() {
+	resp, err := http.Get("https://api.github.com/users/GoesToEleven")
+	if err != nil {
+		log.Fatalf("error getting request: %s", err)
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode != http.StatusOK {
+		log.Fatalf("error: %s", resp.Status)
+	}
+
+	var u User
+	dec := json.NewDecoder(resp.Body)
+	if err := dec.Decode(&u); err != nil {
+		log.Fatalf("error decoding: %s", err)
+	}
+	fmt.Println("Name\t\t", u.Name)
+	fmt.Println("Public Repos\t", u.Public_Repos)
+	fmt.Println("----")
+	fmt.Printf("%#v", u)
+}
+
+type User struct {
+	Name         string
+	Public_Repos int
+}

000-aq-json-04-unmarshal/main.go

@@ -0,0 +1,42 @@
+package main
+
+import (
+	"encoding/json"
+	"fmt"
+	"io"
+	"log"
+	"net/http"
+)
+
+// serialization: json, xml, csv, protobuffers
+
+func main() {
+	resp, err := http.Get("https://api.github.com/users/GoesToEleven")
+	if err != nil {
+		log.Fatalf("error getting request: %s", err)
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode != http.StatusOK {
+		log.Fatalf("error: %s", resp.Status)
+	}
+
+	var u User
+	xb, err := io.ReadAll(resp.Body)
+	if err != nil {
+		log.Fatalf("error reading: %s", err)
+	}
+	if err := json.Unmarshal(xb, &u); err != nil {
+		log.Fatalf("unmarshal error: %s", err)
+	}
+
+	fmt.Println("Name\t\t", u.Name)
+	fmt.Println("Public Repos\t", u.Public_Repos)
+	fmt.Println("----")
+	fmt.Printf("%#v", u)
+}
+
+type User struct {
+	Name         string
+	Public_Repos int
+}

000-aq-json-05-tags/main.go

@@ -0,0 +1,37 @@
+package main
+
+import (
+	"encoding/json"
+	"fmt"
+	"log"
+	"net/http"
+)
+
+// command palette (ctrl+shift+p): Go: add tags to struct fields 
+
+func main() {
+	resp, err := http.Get("https://api.github.com/users/GoesToEleven")
+	if err != nil {
+		log.Fatalf("error getting request: %s", err)
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode != http.StatusOK {
+		log.Fatalf("error: %s", resp.Status)
+	}
+
+	var u User
+	dec := json.NewDecoder(resp.Body)
+	if err := dec.Decode(&u); err != nil {
+		log.Fatalf("error decoding: %s", err)
+	}
+	fmt.Println("Name\t\t", u.Name)
+	fmt.Println("Public Repos\t", u.NumRepos)
+	fmt.Println("----")
+	fmt.Printf("%#v", u)
+}
+
+type User struct {
+	Name     string `json:"name,omitempty"`
+	NumRepos int    `json:"num_repos,omitempty"`
+}

000-ar-checksum-01/main.go

@@ -0,0 +1,34 @@
+package main
+
+import (
+	"crypto/sha1"
+	"fmt"
+	"io"
+	"log"
+	"os"
+)
+
+func main() {
+	s, err := sha1Sum("./simpleFile.txt")
+	if err != nil {
+		log.Fatalf("error getting sha1: %s", err)
+	}
+	fmt.Println(s)
+}
+
+func sha1Sum(fileName string) (string, error) {
+	file, err := os.Open(fileName)
+	if err != nil {
+		return "", nil
+	}
+	defer file.Close()
+
+	w := sha1.New()
+	if _, err := io.Copy(w, file); err != nil {
+		return "", err
+	}
+	sig := w.Sum(nil)
+	return fmt.Sprintf("%x", sig), nil
+}
+
+// cat simpleFile.txt | sha1sum

000-ar-checksum-01/simpleFile.txt

@@ -0,0 +1 @@
+this is a simple text file