219 lines
3.5 KiB
Go
219 lines
3.5 KiB
Go
|
package scribble
|
||
|
|
||
|
import (
|
||
|
"fmt"
|
||
|
"io/ioutil"
|
||
|
"os"
|
||
|
"strings"
|
||
|
|
||
|
"github.com/nanobox-core/nanobox-server/utils"
|
||
|
)
|
||
|
|
||
|
//
|
||
|
type (
|
||
|
|
||
|
// Driver represents
|
||
|
Driver struct {
|
||
|
channels map[string]chan int
|
||
|
dir string
|
||
|
}
|
||
|
|
||
|
// Transaction represents
|
||
|
Transaction struct {
|
||
|
Action string
|
||
|
Collection string
|
||
|
Resource string
|
||
|
Container interface{}
|
||
|
}
|
||
|
)
|
||
|
|
||
|
//
|
||
|
var (
|
||
|
debugging bool
|
||
|
)
|
||
|
|
||
|
// Init
|
||
|
func (d *Driver) Init(opts map[string]string) int {
|
||
|
fmt.Printf("Creating database directory at '%v'...\n", opts["db_dir"])
|
||
|
|
||
|
debugging = (opts["debugging"] == "true")
|
||
|
|
||
|
d.dir = opts["db_dir"]
|
||
|
|
||
|
//
|
||
|
d.channels = make(map[string]chan int)
|
||
|
|
||
|
// make a ping channel
|
||
|
ping := make(chan int)
|
||
|
d.channels["ping"] = ping
|
||
|
|
||
|
//
|
||
|
if err := mkDir(d.dir); err != nil {
|
||
|
fmt.Printf("Unable to create dir '%v': %v", d.dir, err)
|
||
|
return 1
|
||
|
}
|
||
|
|
||
|
//
|
||
|
return 0
|
||
|
}
|
||
|
|
||
|
// Transact
|
||
|
func (d *Driver) Transact(trans Transaction) {
|
||
|
|
||
|
//
|
||
|
done := d.getOrCreateChan(trans.Collection)
|
||
|
|
||
|
//
|
||
|
switch trans.Action {
|
||
|
case "write":
|
||
|
go d.write(trans, done)
|
||
|
case "read":
|
||
|
go d.read(trans, done)
|
||
|
case "readall":
|
||
|
go d.readAll(trans, done)
|
||
|
case "delete":
|
||
|
go d.delete(trans, done)
|
||
|
default:
|
||
|
fmt.Println("Unsupported action ", trans.Action)
|
||
|
}
|
||
|
|
||
|
// wait...
|
||
|
<-done
|
||
|
}
|
||
|
|
||
|
// private
|
||
|
|
||
|
// write
|
||
|
func (d *Driver) write(trans Transaction, done chan<- int) {
|
||
|
|
||
|
//
|
||
|
dir := d.dir + "/" + trans.Collection
|
||
|
|
||
|
//
|
||
|
if err := mkDir(dir); err != nil {
|
||
|
fmt.Println("Unable to create dir '%v': %v", dir, err)
|
||
|
os.Exit(1)
|
||
|
}
|
||
|
|
||
|
//
|
||
|
file, err := os.Create(dir + "/" + trans.Resource)
|
||
|
if err != nil {
|
||
|
fmt.Printf("Unable to create file %v/%v: %v", trans.Collection, trans.Resource, err)
|
||
|
os.Exit(1)
|
||
|
}
|
||
|
|
||
|
defer file.Close()
|
||
|
|
||
|
//
|
||
|
b := utils.ToJSONIndent(trans.Container)
|
||
|
|
||
|
_, err = file.WriteString(string(b))
|
||
|
if err != nil {
|
||
|
fmt.Printf("Unable to write to file %v: %v", trans.Resource, err)
|
||
|
os.Exit(1)
|
||
|
}
|
||
|
|
||
|
// release...
|
||
|
done <- 0
|
||
|
}
|
||
|
|
||
|
// read
|
||
|
func (d *Driver) read(trans Transaction, done chan<- int) interface{} {
|
||
|
|
||
|
dir := d.dir + "/" + trans.Collection
|
||
|
|
||
|
b, err := ioutil.ReadFile(dir + "/" + trans.Resource)
|
||
|
if err != nil {
|
||
|
fmt.Printf("Unable to read file %v/%v: %v", trans.Collection, trans.Resource, err)
|
||
|
os.Exit(1)
|
||
|
}
|
||
|
|
||
|
if err := utils.FromJSON(b, trans.Container); err != nil {
|
||
|
panic(err)
|
||
|
}
|
||
|
|
||
|
// release...
|
||
|
done <- 0
|
||
|
|
||
|
return trans.Container
|
||
|
}
|
||
|
|
||
|
// readAll
|
||
|
func (d *Driver) readAll(trans Transaction, done chan<- int) {
|
||
|
|
||
|
dir := d.dir + "/" + trans.Collection
|
||
|
|
||
|
//
|
||
|
files, err := ioutil.ReadDir(dir)
|
||
|
|
||
|
// if there is an error here it just means there are no evars so dont do anything
|
||
|
if err != nil {
|
||
|
}
|
||
|
|
||
|
var f []string
|
||
|
|
||
|
for _, file := range files {
|
||
|
b, err := ioutil.ReadFile(dir + "/" + file.Name())
|
||
|
if err != nil {
|
||
|
panic(err)
|
||
|
}
|
||
|
|
||
|
f = append(f, string(b))
|
||
|
}
|
||
|
|
||
|
//
|
||
|
if err := utils.FromJSON([]byte("["+strings.Join(f, ",")+"]"), trans.Container); err != nil {
|
||
|
panic(err)
|
||
|
}
|
||
|
|
||
|
// release...
|
||
|
done <- 0
|
||
|
}
|
||
|
|
||
|
// delete
|
||
|
func (d *Driver) delete(trans Transaction, done chan<- int) {
|
||
|
|
||
|
dir := d.dir + "/" + trans.Collection
|
||
|
|
||
|
err := os.Remove(dir + "/" + trans.Resource)
|
||
|
if err != nil {
|
||
|
fmt.Printf("Unable to delete file %v/%v: %v", trans.Collection, trans.Resource, err)
|
||
|
os.Exit(1)
|
||
|
}
|
||
|
|
||
|
// release...
|
||
|
done <- 0
|
||
|
}
|
||
|
|
||
|
// helpers
|
||
|
|
||
|
// getChan
|
||
|
func (d *Driver) getOrCreateChan(channel string) chan int {
|
||
|
|
||
|
c, ok := d.channels[channel]
|
||
|
|
||
|
// if the chan doesn't exist make it
|
||
|
if !ok {
|
||
|
d.channels[channel] = make(chan int)
|
||
|
return d.channels[channel]
|
||
|
}
|
||
|
|
||
|
return c
|
||
|
}
|
||
|
|
||
|
// mkDir
|
||
|
func mkDir(d string) error {
|
||
|
|
||
|
//
|
||
|
dir, _ := os.Stat(d)
|
||
|
|
||
|
if dir == nil {
|
||
|
err := os.MkdirAll(d, 0755)
|
||
|
if err != nil {
|
||
|
return err
|
||
|
}
|
||
|
}
|
||
|
|
||
|
return nil
|
||
|
}
|