vkorbes

k8s_yaml(['web/manifest.yml', 'router/manifest.yml', 'links/manifest.yml'])
docker_build('docker.io/ellenkorbes/web', 'web')
docker_build('docker.io/ellenkorbes/router', 'router')
docker_build('docker.io/ellenkorbes/links', 'links')

vkorbes

$  dlv debug
Type 'help' for list of commands.
(dlv) b main.go:28
Breakpoint 1 set at 0x6fcffe for main.get() ./main.go:28
(dlv) c
> main.get() ./main.go:28 (hits goroutine(1):1 total:1) (PC: 0x6fcffe)
    23:         if err != nil {
    24:                 log.Fatalln(err)
    25:         }
    26:

vkorbes

$ go run main.go 
The webserver said: Howdy!
$

vkorbes

func main() {
        http.HandleFunc("/", webserver)
        go http.ListenAndServe(":8080", nil) // Fixed!
        message := get()
        fmt.Println("The webserver said:", message)
}

vkorbes

func main() {
        http.HandleFunc("/", webserver)
        http.ListenAndServe(":8080", nil) // This blocks!
        message := get()                  // Code never gets here.
        fmt.Println("The webserver said:", message)
}

vkorbes

> net/http.(*Server).Serve() /usr/local/go/src/net/http/server.go:2825 (PC: 0x6c685b)
  2820:         defer srv.trackListener(&l, false)
  2821:
  2822:         var tempDelay time.Duration     // how long to sleep on accept failure
  2823:         baseCtx := context.Background() // base is always background, per Issue 16220
  2824:         ctx := context.WithValue(baseCtx, ServerContextKey, srv)
=>2825:         for {
  2826:                 rw, e := l.Accept()
  2827:                 if e != nil {
  2828:                         select {

vkorbes

(dlv) break /usr/local/go/src/net/http/server.go:2764
Breakpoint 2 set at 0x6c63d5 for net/http.(*Server).ListenAndServe() /usr/local/go/src/net/http/server.go:2764
(dlv) breakpoints
Breakpoint 1 at 0x6fcb78 for main.main() ./main.go:10 (1)
Breakpoint 2 at 0x6c63d5 for net/http.(*Server).ListenAndServe() /usr/local/go/src/net/http/server.go:2764 (0)
(dlv) clear 1
Breakpoint 1 cleared at 0x6fcb78 for main.main() ./main.go:10
(dlv)

vkorbes

> net/http.(*Server).ListenAndServe() /usr/local/go/src/net/http/server.go:2764 (hits goroutine(1):1 total:1) (PC: 0x6c63d5)
  2759:         }
  2760:         ln, err := net.Listen("tcp", addr)
  2761:         if err != nil {
  2762:                 return err
  2763:         }
=>2764:         return srv.Serve(tcpKeepAliveListener{ln.(*net.TCPListener)})
  2765: }
  2766:
  2767: var testHookServerServe func(*Server, net.Listener) // used if non-nil

vkorbes

> net/http.(*Server).ListenAndServe() /usr/local/go/src/net/http/server.go:2752 (PC: 0x6c6248)
  2747: //
  2748: // If srv.Addr is blank, ":http" is used.
  2749: //
  2750: // ListenAndServe always returns a non-nil error. After Shutdown or Close,
  2751: // the returned error is ErrServerClosed.
=>2752: func (srv *Server) ListenAndServe() error {
  2753:         if srv.shuttingDown() {
  2754:                 return ErrServerClosed
  2755:         }

vkorbes

(dlv) c
> main.main() ./main.go:12 (hits goroutine(1):1 total:1) (PC: 0x6fcbb4)
     7:         "fmt"
     8: )
     9:
    10: func main() {
    11:         http.HandleFunc("/", webserver)
=>  12:         http.ListenAndServe(":8080", nil)
    13:         message := get()
    14:         fmt.Println("The webserver said:", message)