/
overseerdb.go
134 lines (111 loc) · 2.62 KB
/
overseerdb.go
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package main
import (
"bytes"
"errors"
"fmt"
"github.com/jmhodges/levigo"
"log"
"os"
"strconv"
"strings"
"syscall"
)
func InitDB() (*levigo.DB, error) {
opts := levigo.NewOptions()
opts.SetCache(levigo.NewLRUCache(1024 * 1024))
opts.SetCreateIfMissing(true)
homedir := os.Getenv("HOME")
dbdir := homedir + "/.overseer/db"
os.MkdirAll(dbdir, 0700)
db, err := levigo.Open(dbdir, opts)
if err != nil {
fmt.Println("Failed to open database", err)
return nil, err
}
procs, err := ListProcs(db)
for p, status := range procs {
log.Printf("Proc ID: %d, status: %d", p, status)
if isProcAlive(p) == false {
setProcStatus(db, p, PROC_STOPPED)
} else {
setProcStatus(db, p, PROC_ALIVE)
}
}
return db, nil
}
func setProcStatus(db *levigo.DB, pid, status int) {
wo := levigo.NewWriteOptions()
key := "status:" + strconv.Itoa(pid)
db.Put(wo, []byte(key), []byte(strconv.Itoa(status)))
}
func isProcAlive(pid int) bool {
// Doesn't work as expected on POSIX systems
// - https://groups.google.com/forum/#!topic/golang-nuts/WtIsS9dzy68
//_, err := os.FindProcess(pid)
if err := syscall.Kill(pid, 0); err != nil {
return false
} else {
return true
}
}
func removeProc(pid int, db *levigo.DB) error {
wo := levigo.NewWriteOptions()
err := db.Delete(wo, []byte(strconv.Itoa(pid)))
if err != nil {
return err
}
return killProc(pid)
}
func killProc(pid int) error {
proc, err := os.FindProcess(pid)
if err != nil {
return err
}
err = proc.Kill()
return err
}
func AddProc(procID int, db *levigo.DB) error {
ro := levigo.NewReadOptions()
wo := levigo.NewWriteOptions()
data, err := db.Get(ro, []byte("procs"))
spdata := bytes.Split(data, []byte(":"))
for i, e := range spdata {
if string(e) != "" {
fmt.Println("ProcID: #", i, string(e))
pid, err := strconv.Atoi(string(e))
if err != nil {
return err
}
if pid == procID {
return errors.New("Process already exists")
}
if isProcAlive(pid) == false {
removeProc(pid, db)
}
}
if err != nil {
return err
}
}
strdata := string(data)
strdata = strdata + ":" + strconv.Itoa(procID)
err = db.Put(wo, []byte("procs"), []byte(strdata))
return err
}
func ListProcs(db *levigo.DB) (map[int]int, error) {
ro := levigo.NewReadOptions()
procs, err := db.Get(ro, []byte("procs"))
if err != nil {
return map[int]int{}, err
}
procs_arr := strings.Split(string(procs), ":")
var procs_arr2 = map[int]int{}
for _, p := range procs_arr {
status, err := db.Get(ro, []byte("status:"+p))
if err == nil {
p_int, _ := strconv.Atoi(p)
procs_arr2[p_int], _ = strconv.Atoi(string(status))
}
}
return procs_arr2, err
}