refactor: re-org packages

app/cmd/update.go

@@ -0,0 +1,49 @@
+package main
+
+import (
+	"encoding/json"
+	"io/ioutil"
+	"net/http"
+	"strings"
+	"time"
+
+	"github.com/sirupsen/logrus"
+)
+
+const githubAPIURL = "https://api.github.com/repos/apernet/hysteria/releases/latest"
+
+type releaseInfo struct {
+	URL         string `json:"html_url"`
+	TagName     string `json:"tag_name"`
+	CreatedAt   string `json:"created_at"`
+	PublishedAt string `json:"published_at"`
+}
+
+func checkUpdate() {
+	sv := strings.Split(appVersion, "-")[0]
+	info, err := fetchLatestRelease()
+	if err == nil && info.TagName != sv {
+		logrus.WithFields(logrus.Fields{
+			"version": info.TagName,
+			"url":     info.URL,
+		}).Info("New version available")
+	}
+}
+
+func fetchLatestRelease() (*releaseInfo, error) {
+	hc := &http.Client{
+		Timeout: time.Second * 20,
+	}
+	resp, err := hc.Get(githubAPIURL)
+	if err != nil {
+		return nil, err
+	}
+	defer resp.Body.Close()
+	body, err := ioutil.ReadAll(resp.Body)
+	if err != nil {
+		return nil, err
+	}
+	var info releaseInfo
+	err = json.Unmarshal(body, &info)
+	return &info, err
+}