go music example: music brainz api

go-music/go.mod

@@ -0,0 +1,3 @@
+module go-music
+
+go 1.14

go-music/mb.go

@@ -0,0 +1,120 @@
+package main
+
+import (
+	"net/http"
+	"fmt"
+	"os"
+	"time"
+	"encoding/json"
+	"sort"
+)
+
+func main(){
+
+	timeout := time.Duration( 10 * time.Second )
+	client := http.Client { Timeout: timeout }
+
+	req, err := http.NewRequest("GET", "https://musicbrainz.org/ws/2/artist?query=Metallica", nil)
+	req.Header.Set("User-Agent", "Go Application Development")
+	req.Header.Set("Content-Type", "application/json")
+	req.Header.Set("Accept", "application/json")
+
+	if (err != nil) {
+		fmt.Println("error creating request\n%v", err)
+		os.Exit(1)
+	}
+
+	resp, err := client.Do(req)
+	if (err != nil) {
+		fmt.Println("error opening request\n%v", err)
+		os.Exit(1)
+	}
+	defer resp.Body.Close()
+	if (err != nil) {
+		fmt.Println("could not read body\n%v", err)
+		os.Exit(1)
+	}
+	var result mb_artist_search
+	json.NewDecoder(resp.Body).Decode(&result)
+
+	fmt.Println(result.Artists[0].Name)
+
+	for _, element := range get_artist_tags(&result){
+		fmt.Printf("\ntag: %2d: %s", element.Count, element.Name)
+	}
+}
+
+func get_artist_tags (res *mb_artist_search) []mb_tag{
+	var t []mb_tag
+	for _, elem := range res.Artists[0].Tags  {
+		if int(elem.Count) > 0 {
+			t = append(t, elem)
+		}
+	}
+	sort.Sort(ByInverseCount(t))
+	return t
+}
+
+
+
+
+type mb_artist_search struct {
+	Created time.Time `json:"created"`
+	Count   int       `json:"count"`
+	Offset  int       `json:"offset"`
+	Artists []struct {
+		ID       string `json:"id"`
+		Type     string `json:"type,omitempty"`
+		TypeID   string `json:"type-id,omitempty"`
+		Score    int    `json:"score"`
+		Name     string `json:"name"`
+		SortName string `json:"sort-name"`
+		Country  string `json:"country,omitempty"`
+		Area     struct {
+			ID       string `json:"id"`
+			Type     string `json:"type"`
+			TypeID   string `json:"type-id"`
+			Name     string `json:"name"`
+			SortName string `json:"sort-name"`
+			LifeSpan struct {
+				Ended interface{} `json:"ended"`
+			} `json:"life-span"`
+		} `json:"area,omitempty"`
+		BeginArea struct {
+			ID       string `json:"id"`
+			Type     string `json:"type"`
+			TypeID   string `json:"type-id"`
+			Name     string `json:"name"`
+			SortName string `json:"sort-name"`
+			LifeSpan struct {
+				Ended interface{} `json:"ended"`
+			} `json:"life-span"`
+		} `json:"begin-area,omitempty"`
+		Isnis    []string `json:"isnis,omitempty"`
+		LifeSpan struct {
+			Begin string      `json:"begin"`
+			Ended interface{} `json:"ended"`
+		} `json:"life-span,omitempty"`
+		Aliases []struct {
+			SortName  string      `json:"sort-name"`
+			TypeID    string      `json:"type-id,omitempty"`
+			Name      string      `json:"name"`
+			Locale    interface{} `json:"locale"`
+			Type      string      `json:"type"`
+			Primary   interface{} `json:"primary"`
+			BeginDate interface{} `json:"begin-date"`
+			EndDate   interface{} `json:"end-date"`
+		} `json:"aliases,omitempty"`
+		Tags []mb_tag   `json:"tags,omitempty"`
+		Disambiguation string `json:"disambiguation,omitempty"`
+	} `json:"artists"`
+}
+
+type mb_tag struct{
+	Count int `json:"count"`
+	Name string `json:"name"`
+}
+type ByInverseCount []mb_tag
+func (t ByInverseCount) Len() int { return len(t) }
+func (t ByInverseCount) Less (i, j int) bool { return t[i].Count >= t[j].Count }
+func (t ByInverseCount) Swap (i,j int) { t[i], t[j] = t[j], t[i] }