doodle/pkg/updater/updater.go

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// Package updater checks for updates to Doodle.
package updater
import (
"encoding/json"
"fmt"
"io/ioutil"
"net/http"
"regexp"
"strconv"
"time"
2022-09-24 22:17:25 +00:00
"git.kirsle.net/SketchyMaze/doodle/pkg/branding"
"git.kirsle.net/SketchyMaze/doodle/pkg/log"
)
// VersionInfo holds the version.json data for self-update check.
type VersionInfo struct {
LatestVersion string `json:"latestVersion"`
DownloadURL string `json:"downloadUrl"`
}
// IsNewerVersionThan checks if the version.json houses a newer
// game version than the currently running game's version string.
func (i VersionInfo) IsNewerVersionThan(versionString string) bool {
// Parse the two semantic versions.
curSemver, err := ParseSemver(versionString)
if err != nil {
log.Error("VersionInfo.IsNewerVersionThan: didn't parse semver: %s", err)
return false
}
latestSemver, err := ParseSemver(i.LatestVersion)
if err != nil {
log.Error("VersionInfo.IsNewerVersionThan: didn't parse latest semver: %s", err)
return false
}
// Check if there's a newer version.
if latestSemver[Major] > curSemver[Major] {
// We're a major version behind, like 0.x.x < 1.x.x
return true
} else if latestSemver[Major] == curSemver[Major] {
// We're on the same major version, like 0.x.x
// Check the minor version.
if latestSemver[Minor] > curSemver[Minor] {
return true
} else if latestSemver[Minor] == curSemver[Minor] {
// Same minor version, check patch version.
if latestSemver[Patch] > curSemver[Patch] {
return true
}
}
}
return false
}
// Last result of the update check, until forced to re-check.
var lastUpdate VersionInfo
// Check for new updates.
func Check() (VersionInfo, error) {
var result VersionInfo
// Return last cached check.
if lastUpdate.LatestVersion != "" {
return lastUpdate, nil
}
client := &http.Client{
Timeout: 10 * time.Second,
}
req, err := http.NewRequest("GET", branding.UpdateCheckJSON, nil)
if err != nil {
return result, fmt.Errorf("updater.Check: HTTP error getting %s: %s", branding.UpdateCheckJSON, err)
}
req.Header.Add("User-Agent", branding.UserAgent())
log.Debug("Checking for app updates")
resp, err := client.Do(req)
if err != nil {
return result, fmt.Errorf("updater.Check: HTTP error: %s", err)
}
if resp.StatusCode != http.StatusOK {
return result, fmt.Errorf("updater.Check: unexpected HTTP status code %d", resp.StatusCode)
}
// Parse the JSON response.
body, _ := ioutil.ReadAll(resp.Body)
err = json.Unmarshal(body, &result)
if err != nil {
return result, fmt.Errorf("updater.Check: JSON parse error: %s", err)
}
lastUpdate = result
return result, nil
}
// CheckNow forces a re-check of the update info.
func CheckNow() (VersionInfo, error) {
lastUpdate = VersionInfo{}
return Check()
}
// ParseSemver parses a Project: Doodle semantic version number into its
// three integer parts. Historical versions of the game looked like
// either "0.1.0-alpha" or "0.7.0" and the given version string is
// expected to match that pattern.
func ParseSemver(versionString string) ([3]int, error) {
var numbers [3]int
result := semverRegexp.FindStringSubmatch(versionString)
if result == nil {
return numbers, fmt.Errorf("%s: didn't parse as a valid semver string", versionString)
}
// string to int helper
var atoi = func(v string) int {
a, _ := strconv.Atoi(v)
return a
}
numbers = [3]int{
atoi(result[1]),
atoi(result[2]),
atoi(result[3]),
}
return numbers, nil
}
var semverRegexp = regexp.MustCompile(`^(\d+)\.(\d+)\.(\d+).*`)
// Some semantic version indexing constants, to parse the result of
// ParseSemver with more semantic code.
const (
Major int = iota
Minor
Patch
)