tsk-6: Check queue (#12)

Closes #6

Reviewed-on: #12
Co-authored-by: phoenix <kundeng00@pm.me>
Co-committed-by: phoenix <kundeng00@pm.me>

internal/service/queue.go

@@ -0,0 +1,54 @@
+package service
+
+import (
+	"encoding/json"
+	"fmt"
+	"net/http"
+
+	"git.kundeng.us/phoenix/textsender-models/tx0/message/scheduling"
+	"git.kundeng.us/phoenix/textsender-models/tx0/token"
+
+	"git.kundeng.us/phoenix/catapult/internal/app"
+)
+
+type Queue struct {
+	Application *app.App
+	Token       *token.Login
+}
+
+type queueResponse struct {
+	Message string                         `json:"message"`
+	Data    []*scheduling.ScheduledMessage `json:"data"`
+}
+
+func (q *Queue) GetQueue() (*scheduling.ScheduledMessage, *bool, error) {
+	req, err := http.NewRequest("GET", fmt.Sprintf("%s/api/v1/schedule/message/fetch", q.Application.ApiUrl), nil)
+	if err != nil {
+		return nil, nil, err
+	}
+
+	token := q.Token.AccessToken
+	req.Header.Set("Authorization", "Bearer "+token)
+
+	client := &http.Client{}
+	resp, err := client.Do(req)
+	if err != nil {
+		return nil, nil, err
+	}
+	defer resp.Body.Close()
+
+	var r queueResponse
+	err = json.NewDecoder(resp.Body).Decode(&r)
+	if err != nil {
+		return nil, nil, err
+	} else {
+		var exists bool
+		if len(r.Data) == 0 {
+			exists = false
+			return nil, &exists, nil
+		} else {
+			exists = true
+			return r.Data[0], &exists, nil
+		}
+	}
+}