forked from sensu/sensu-go
/
main.go
64 lines (53 loc) · 1.43 KB
/
main.go
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// This program is a sensu extension. It runs a gRPC server on its specified
// port. The extension filters all events that have a successful check and
// logs all events that have a failing check.
package main
import (
"flag"
"fmt"
"log"
"net"
"os"
"os/signal"
"github.com/sensu/sensu-go/rpc/extension"
"github.com/sensu/sensu-go/types"
)
var (
port = flag.Int("port", 31000, "port to run extension server on")
)
// LastCheckStatusZero returns true if the last status of the check was 0
// or if the event does not contain a check
func LastCheckStatusZero(event *types.Event) (bool, error) {
if !event.HasCheck() {
// Filter metrics events as well.
return true, nil
}
return event.Check.Status == 0, nil
}
// FailingCheck logs which entity/check is failing
func FailingCheck(event *types.Event, mutated []byte) error {
if !event.HasCheck() {
log.Print("event does not contain check")
return nil
}
log.Printf("entity %q: %s is failing", event.Entity.Name, event.Check.Name)
return nil
}
func main() {
flag.Parse()
ext := extension.New().Filter(LastCheckStatusZero).Handle(FailingCheck)
ln, err := net.Listen("tcp", fmt.Sprintf("127.0.0.1:%d", *port))
if err != nil {
log.Fatal(err)
}
defer ln.Close()
server := extension.NewServer(ext, ln)
defer server.Stop()
if err := server.Start(); err != nil {
log.Fatal(err)
}
c := make(chan os.Signal, 1)
signal.Notify(c, os.Interrupt)
<-c
log.Println("Shutting down...")
}