package main import ( "flag" "fmt" "log" "rescribe.xyz/bookpipeline" ) const usage = `Usage: spotme [-n num] Create new spot instances for the book pipeline. ` type SpotPipeliner interface { Init() error StartInstances(n int) error } // NullWriter is used so non-verbose logging may be discarded type NullWriter bool func (w NullWriter) Write(p []byte) (n int, err error) { return len(p), nil } func main() { num := flag.Int("n", 1, "number of instances to start") flag.Usage = func() { fmt.Fprintf(flag.CommandLine.Output(), usage) flag.PrintDefaults() } flag.Parse() var verboselog *log.Logger var n NullWriter verboselog = log.New(n, "", 0) var conn SpotPipeliner conn = &bookpipeline.AwsConn{Region: "eu-west-2", Logger: verboselog} err := conn.Init() if err != nil { log.Fatalln("Failed to set up cloud connection:", err) } log.Println("Starting spot instances") err = conn.StartInstances(*num) if err != nil { log.Fatalln("Failed to start a spot instance:", err) } log.Println("Spot instance request sent successfully") }