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|
package main
import (
"fmt"
"strings"
"flag"
"errors"
"net/http"
"os"
"io"
"io/ioutil"
"encoding/json"
)
type VersionMeta struct {
Poi VersionData `json:"poi"`
}
type VersionData struct {
Version string `json:"version"`
Patch int `json:"patch"`
Commit string `json:"commit"`
}
func parseJson(name string) (ver VersionMeta, err error) {
var reader io.Reader
if strings.HasPrefix(name, "https://") {
// Grabbing stuff over https
resp, e := http.Get(name)
if resp.StatusCode != 200 {
e = errors.New("HTTP response not OK")
}
if e != nil {
fmt.Println("| Error encountered getting version.json: ", e)
}
defer resp.Body.Close()
reader = resp.Body
err = e
} else {
// FIXME Assuming we're grabbing a local file
r, e := os.Open(name)
if e != nil {
fmt.Println("| Error opening file: ", e)
}
defer r.Close()
reader = r
err = e
}
if err == nil {
body, err := ioutil.ReadAll(reader)
if err != nil {
fmt.Println("| Error encountered reading body")
}
err = json.Unmarshal(body, &ver)
}
return
}
// left > right r -> 1
// left = right r -> 0
// left < right r -> -1
func compareVersion(left, right string) (ret int) {
if strings.Compare(left, right) == 0 {
ret = 0
return
}
l := strings.Split(left, ".")
r := strings.Split(right, ".")
for i := 0; i < 3; i++ {
if l[i] > r[i] {
ret = 1
break
} else if l[i] < r[i] {
ret = -1
break
}
}
return
}
func main() {
fmt.Println("[ smolbote updater ]")
// read local version.json
localFlag := flag.Bool("local", true, "Read local version.json")
// read remote version.json
remoteFlag := flag.Bool("remote", true, "Read remote version.json")
// download update
downloadFlag := flag.Bool("download", false, "Download update")
// install update
installFlag := flag.Bool("install", false, "Install update")
flag.Parse()
var local VersionMeta
var remote VersionMeta
var err error
if *localFlag {
fmt.Println("+ Reading local version.json")
local, err = parseJson("version.json")
if err == nil {
fmt.Println(fmt.Sprintf("| Got poi [%s-%d-%s]", local.Poi.Version, local.Poi.Patch, local.Poi.Commit))
} else {
// there has been an error reading the local version.json
*localFlag = false
}
fmt.Println("\\ done")
}
if *remoteFlag {
fmt.Println("+ Reading remote version.json")
remote, err = parseJson("https://neueland.iserlohn-fortress.net/smolbote/version")
if err == nil {
fmt.Println(fmt.Sprintf("| Got poi [%s-%d-%s]", remote.Poi.Version, remote.Poi.Patch, remote.Poi.Commit))
}
comp := compareVersion(local.Poi.Version, remote.Poi.Version)
if comp >= 0 {
fmt.Println("| poi up to poi")
} else { // comp < 0
fmt.Println("| poi out of poi")
}
fmt.Println("\\ done")
}
if *downloadFlag {
fmt.Println("+ Downloading update")
fmt.Println("\\ done")
}
if *installFlag {
fmt.Println("+ Installing update")
fmt.Println("\\ done")
}
}
|
