release_checker.groovy

def version = '1.3.7' //target version
def released = false
def sock
int interval = 120
for(;;){
    if(!released){
        sock = new Socket('dist.springframework.org.s3.amazonaws.com',80)
        sock.withStreams{input,output->
            output << "GET /release/GRAILS/grails-${version}.zip HTTP/1.1\r\n"
            output << "Host: dist.springframework.org.s3.amazonaws.com\r\n"
            output << "Connection: close:\r\n\r\n"
            output.flush()
            def line = input.newReader().readLine()
            if(line && line == 'HTTP/1.1 200 OK'){
                released = true
                interval = 5
            }else{
                print '.' 
            }
        }
    }
    if(released){
        //mac only!
        "say -v Agnes 'Grails ${version} Release'".execute()
    }
    Thread.sleep(1000*interval)
}