/
main.go
218 lines (195 loc) · 4.58 KB
/
main.go
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package main
import (
"flag"
"fmt"
"io/ioutil"
"log"
"os"
"os/signal"
"path/filepath"
"syscall"
"github.com/mayahq/maya-toy-engine/components/utils"
"github.com/mayahq/maya-toy-engine/runtime"
"github.com/howeyc/fsnotify"
zmq "github.com/pebbe/zmq4"
)
var (
// Flafs
inputEndpoint = flag.String("port.dir", "", "Component's input port endpoint")
outputEndpoint = flag.String("port.created", "", "Component's output port endpoint")
errorEndpoint = flag.String("port.err", "", "Component's error port endpoint")
jsonFlag = flag.Bool("json", false, "Print component documentation in JSON")
debug = flag.Bool("debug", false, "Enable debug mode")
// Internal
inPort, outPort, errPort *zmq.Socket
outCh, errCh chan bool
exitCh chan os.Signal
ip [][]byte
err error
)
func main() {
flag.Parse()
if *jsonFlag {
doc, _ := registryEntry.JSON()
fmt.Println(string(doc))
os.Exit(0)
}
log.SetFlags(0)
if *debug {
log.SetOutput(os.Stdout)
} else {
log.SetOutput(ioutil.Discard)
}
validateArgs()
// Communication channels
outCh = make(chan bool)
errCh = make(chan bool)
exitCh = make(chan os.Signal, 1)
// Start the communication & processing logic
go mainLoop()
// Wait for the end...
signal.Notify(exitCh, os.Interrupt, syscall.SIGTERM)
<-exitCh
log.Println("Done")
}
// mainLoop initiates all ports and handles the traffic
func mainLoop() {
// Setup watcher
watcher, err := fsnotify.NewWatcher()
if err != nil {
exitCh <- syscall.SIGTERM
return
}
defer watcher.Close()
openPorts()
defer closePorts()
// Process events
go func() {
// Socket to send messages to task sink
outPort, err = utils.CreateOutputPort("fs/watchdog.out", *outputEndpoint, errCh)
if err != nil {
exitCh <- syscall.SIGTERM
return
}
for {
select {
case ev := <-watcher.Event:
log.Println("Event:", ev)
if ev.IsCreate() {
if isDir(ev.Name) {
err = filepath.Walk(ev.Name, func(path string, info os.FileInfo, err error) error {
if err != nil {
return err
}
if info.IsDir() {
// we need to watch every subdirectory explicitely
watcher.Watch(path)
log.Println("Added to watch:", path)
} else {
// Consider every file found in the created directory as just created
outPort.SendMessage(runtime.NewPacket([]byte(path)))
}
return nil
})
if err != nil {
log.Println("Error walking directory:", err.Error())
}
} else {
outPort.SendMessage(runtime.NewPacket([]byte(ev.Name)))
}
} else if ev.IsDelete() && isDir(ev.Name) {
watcher.RemoveWatch(ev.Name)
log.Println("Removed from watch:", ev.Name)
}
case err := <-watcher.Error:
log.Println("Error:", err)
}
}
}()
go func() {
for {
select {
case v := <-outCh:
if !v {
log.Println("CREATED port is closed. Interrupting execution")
exitCh <- syscall.SIGTERM
break
}
case v := <-errCh:
if !v {
log.Println("ERR port is closed. Interrupting execution")
exitCh <- syscall.SIGTERM
break
}
}
}
}()
// Main loop
log.Println("Started")
for {
ip, err := inPort.RecvMessageBytes(0)
if err != nil {
continue
}
if !runtime.IsValidIP(ip) {
continue
}
dir := string(ip[1])
err = filepath.Walk(dir, func(path string, info os.FileInfo, err error) error {
if err != nil {
return err
}
if info.IsDir() {
watcher.Watch(path)
log.Println("Added to watch:", path)
}
return nil
})
if err != nil {
log.Printf("ERROR opening file %s: %s", dir, err.Error())
if errPort != nil {
errPort.SendMessage(runtime.NewPacket([]byte(err.Error())))
}
continue
}
}
}
func isDir(path string) bool {
info, err := os.Stat(path)
if err != nil {
return false
}
return info.IsDir()
}
// validateArgs checks all required flags
func validateArgs() {
if *inputEndpoint == "" {
flag.Usage()
os.Exit(1)
}
if *outputEndpoint == "" {
flag.Usage()
os.Exit(1)
}
}
// openPorts create ZMQ sockets and start socket monitoring loops
func openPorts() {
inPort, err = utils.CreateInputPort("fs/watchdog.in", *inputEndpoint, nil)
utils.AssertError(err)
if *errorEndpoint != "" {
errPort, err = utils.CreateOutputPort("fs/watchdog.err", *errorEndpoint, errCh)
utils.AssertError(err)
}
}
// closePorts closes all active ports and terminates ZMQ context
func closePorts() {
log.Println("Closing ports...")
inPort.Close()
if outPort != nil {
outPort.Close()
}
if errPort != nil {
errPort.Close()
}
zmq.Term()
}