2014-12-01 17:55:19 -05:00
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package scribble
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import (
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"encoding/json"
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"fmt"
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"io/ioutil"
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"os"
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"strings"
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2014-12-16 11:59:23 -05:00
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"github.com/nanobox-core/hatchet"
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)
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2014-12-16 11:59:23 -05:00
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//
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const Version = "0.0.1"
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//
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type (
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// Driver
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Driver struct {
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channels map[string]chan int
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dir string
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log *hatchet.Logger
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}
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// Transaction represents
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Transaction struct {
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Action string
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Collection string
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Resource string
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Container interface{}
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}
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)
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// New
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func New(dir string, logger hatchet.Logger) (*Driver, error) {
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fmt.Printf("Creating database directory at '%v'...\n", dir)
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scribble := &Driver{}
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scribble.dir = dir
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scribble.channels = make(map[string]chan int)
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//
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if err := mkDir(scribble.dir); err != nil {
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return nil, err
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}
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//
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return scribble, nil
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}
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// Transact
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func (d *Driver) Transact(trans Transaction) error {
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//
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done := d.getOrCreateChan(trans.Collection)
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fail := make(chan error)
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//
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switch trans.Action {
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case "write":
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go d.write(trans, done, fail)
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case "read":
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go d.read(trans, done, fail)
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case "readall":
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go d.readAll(trans, done, fail)
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case "delete":
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go d.delete(trans, done, fail)
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default:
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fmt.Println("Unsupported action ", trans.Action)
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}
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// wait until we're done, or error
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select {
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case <-done:
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return nil
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case err := <-fail:
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return err
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}
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}
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// private
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// write
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func (d *Driver) write(trans Transaction, done chan<- int, fail chan<- error) {
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//
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dir := d.dir + "/" + trans.Collection
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//
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if err := mkDir(dir); err != nil {
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fail <- err
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}
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//
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file, err := os.Create(dir + "/" + trans.Resource)
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if err != nil {
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fail <- err
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}
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defer file.Close()
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//
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b, err := json.MarshalIndent(trans.Container, "", "\t")
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if err != nil {
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fail <- err
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}
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_, err = file.WriteString(string(b))
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if err != nil {
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fail <- err
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}
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// release...
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done <- 0
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}
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// read
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func (d *Driver) read(trans Transaction, done chan<- int, fail chan<- error) interface{} {
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dir := d.dir + "/" + trans.Collection
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b, err := ioutil.ReadFile(dir + "/" + trans.Resource)
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if err != nil {
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fmt.Printf("Unable to read file %v/%v: %v", trans.Collection, trans.Resource, err)
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os.Exit(1)
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}
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if err := json.Unmarshal(b, trans.Container); err != nil {
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fail <- err
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}
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// release...
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done <- 0
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return trans.Container
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}
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// readAll
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func (d *Driver) readAll(trans Transaction, done chan<- int, fail chan<- error) {
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dir := d.dir + "/" + trans.Collection
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//
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files, err := ioutil.ReadDir(dir)
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// an error here just means an empty collection so do nothing
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if err != nil {
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}
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var f []string
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for _, file := range files {
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b, err := ioutil.ReadFile(dir + "/" + file.Name())
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if err != nil {
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fail <- err
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}
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f = append(f, string(b))
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}
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//
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if err := json.Unmarshal([]byte("["+strings.Join(f, ",")+"]"), trans.Container); err != nil {
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fail <- err
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}
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// release...
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done <- 0
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}
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// delete
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func (d *Driver) delete(trans Transaction, done chan<- int, fail chan<- error) {
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dir := d.dir + "/" + trans.Collection
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err := os.Remove(dir + "/" + trans.Resource)
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if err != nil {
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fail <- err
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}
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// release...
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done <- 0
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}
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// helpers
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// getChan
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func (d *Driver) getOrCreateChan(channel string) chan int {
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c, ok := d.channels[channel]
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// if the chan doesn't exist make it
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if !ok {
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d.channels[channel] = make(chan int)
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return d.channels[channel]
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}
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return c
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}
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// mkDir
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func mkDir(d string) error {
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//
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dir, _ := os.Stat(d)
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if dir == nil {
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err := os.MkdirAll(d, 0755)
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if err != nil {
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return err
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}
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}
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return nil
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}
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