hanayo/vendor/zxq.co/ripple/rippleapi/app/v1/meta_linux.go

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2019-02-23 13:29:15 +00:00
// +build !windows
// TODO: Make all these methods POST
package v1
import (
"io"
"io/ioutil"
"log"
"os"
"os/exec"
"syscall"
"time"
"zxq.co/ripple/rippleapi/common"
)
// MetaRestartGET restarts the API with Zero Downtime™.
func MetaRestartGET(md common.MethodData) common.CodeMessager {
proc, err := os.FindProcess(syscall.Getpid())
if err != nil {
return common.SimpleResponse(500, "couldn't find process. what the fuck?")
}
go func() {
time.Sleep(time.Second)
proc.Signal(syscall.SIGUSR2)
}()
return common.SimpleResponse(200, "brb")
}
var upSince = time.Now()
type metaUpSinceResponse struct {
common.ResponseBase
Code int `json:"code"`
Since int64 `json:"since"`
}
// MetaUpSinceGET retrieves the moment the API application was started.
// Mainly used to get if the API was restarted.
func MetaUpSinceGET(md common.MethodData) common.CodeMessager {
return metaUpSinceResponse{
Code: 200,
Since: int64(upSince.UnixNano()),
}
}
// MetaUpdateGET updates the API to the latest version, and restarts it.
func MetaUpdateGET(md common.MethodData) common.CodeMessager {
if f, err := os.Stat(".git"); err == os.ErrNotExist || !f.IsDir() {
return common.SimpleResponse(500, "instance is not using git")
}
go func() {
if !execCommand("git", "pull", "origin", "master") {
return
}
// go get
// -u: update all dependencies
// -d: stop after downloading deps
if !execCommand("go", "get", "-v", "-u", "-d") {
return
}
if !execCommand("bash", "-c", "go build -v -ldflags \"-X main.Version=`git rev-parse HEAD`\"") {
return
}
proc, err := os.FindProcess(syscall.Getpid())
if err != nil {
log.Println(err)
return
}
proc.Signal(syscall.SIGUSR2)
}()
return common.SimpleResponse(200, "Started updating! "+surpriseMe())
}
func execCommand(command string, args ...string) bool {
cmd := exec.Command(command, args...)
cmd.Env = os.Environ()
stdout, err := cmd.StdoutPipe()
if err != nil {
log.Println(err)
return false
}
stderr, err := cmd.StderrPipe()
if err != nil {
log.Println(err)
return false
}
if err := cmd.Start(); err != nil {
log.Println(err)
return false
}
data, err := ioutil.ReadAll(stderr)
if err != nil {
log.Println(err)
return false
}
// Bob. We got a problem.
if len(data) != 0 {
log.Println(string(data))
}
io.Copy(os.Stdout, stdout)
cmd.Wait()
stdout.Close()
return true
}