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package main
import (
"fmt"
"github.com/fsnotify/fsnotify"
"gopkg.in/yaml.v2"
"io/ioutil"
"log"
"os"
// "time"
)
// parse a request file and return a SCORSHmessage
func parseRequest(fname string, msg *spoolMsg) error {
debug.log("[parseRequest] message at start: %s\n", msg)
data, err := ioutil.ReadFile(fname)
if err != nil {
log.Printf("Unable to open file: %s\n", fname)
return SCORSHerr(SCORSH_ERR_NO_FILE)
}
debug.log("[parseRequest] file contains: \n%s\n", data)
debug.log("[parseRequest] reading message from file: %s\n", fname)
err = yaml.Unmarshal([]byte(data), msg)
if err != nil {
return fmt.Errorf("Error parsing message: %s", err)
}
debug.log("[parseRequest] got message: %s\n", msg)
return nil
}
func spooler(watcher *fsnotify.Watcher, master chan spoolMsg) {
log.Println("Spooler started correctly")
for {
select {
case event := <-watcher.Events:
// Here we manage genuine events from fsnotify. We catch the
// "Write" event, which should happen only when the file is
// created
if event.Op == fsnotify.Write {
var msg spoolMsg
debug.log("[spooler] new file %s detected\n", event.Name)
err := parseRequest(event.Name, &msg)
if err != nil {
log.Printf("Invalid packet received. [%s]\n", err)
}
debug.log("[spooler] read message: %s\n", msg)
msg.Path = event.Name
master <- msg
}
case err := <-watcher.Errors:
// here we manage event errors
log.Println("[spooler] error: ", err)
case msg := <-master:
// Here we receive messages from the master about files to be
// removed
log.Printf("[spooler] received deletion request for: %s\n", msg.Path)
err := os.Remove(msg.Path)
if err != nil {
log.Printf("[spooler] error removing file: %s\n", err)
} else {
log.Printf("[spooler] file %s successfully removed\n", msg.Path)
}
}
}
}
func startSpooler(master *master) error {
watcher, err := fsnotify.NewWatcher()
if err != nil {
return fmt.Errorf("error creating watcher: %s", err)
}
err = watcher.Add(master.Spooldir)
if err != nil {
return fmt.Errorf("error adding folder: %s", err)
}
go spooler(watcher, master.Spooler)
return nil
}
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