78 lines
1.9 KiB
Go
78 lines
1.9 KiB
Go
package main
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import (
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"encoding/json"
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"io/ioutil"
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"net/http"
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"regexp"
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"time"
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"golang.org/x/mod/semver"
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)
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const updateCheckURL = "https://api.github.com/repos/knadh/listmonk/releases/latest"
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type remoteUpdateResp struct {
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Version string `json:"tag_name"`
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URL string `json:"html_url"`
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}
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// AppUpdate contains information of a new update available to the app that
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// is sent to the frontend.
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type AppUpdate struct {
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Version string `json:"version"`
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URL string `json:"url"`
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}
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var reSemver = regexp.MustCompile(`-(.*)`)
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// checkUpdates is a blocking function that checks for updates to the app
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// at the given intervals. On detecting a new update (new semver), it
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// sets the global update status that renders a prompt on the UI.
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func checkUpdates(curVersion string, interval time.Duration, app *App) {
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// Strip -* suffix.
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curVersion = reSemver.ReplaceAllString(curVersion, "")
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time.Sleep(time.Second * 1)
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ticker := time.NewTicker(interval)
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for ; true; <-ticker.C {
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resp, err := http.Get(updateCheckURL)
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if err != nil {
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app.log.Printf("error checking for remote update: %v", err)
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continue
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}
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if resp.StatusCode != 200 {
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app.log.Printf("non 200 response on remote update check: %d", resp.StatusCode)
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continue
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}
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b, err := ioutil.ReadAll(resp.Body)
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if err != nil {
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app.log.Printf("error reading remote update payload: %v", err)
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continue
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}
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resp.Body.Close()
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var up remoteUpdateResp
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if err := json.Unmarshal(b, &up); err != nil {
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app.log.Printf("error unmarshalling remote update payload: %v", err)
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continue
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}
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// There is an update. Set it on the global app state.
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if semver.IsValid(up.Version) {
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v := reSemver.ReplaceAllString(up.Version, "")
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if semver.Compare(v, curVersion) > 0 {
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app.Lock()
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app.update = &AppUpdate{
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Version: up.Version,
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URL: up.URL,
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}
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app.Unlock()
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app.log.Printf("new update %s found", up.Version)
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}
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}
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}
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}
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