golang concurrency pattern from fanIn example

I am following Rob Pike's Go concurrency pattern examples from his talk from last 2012 (the the slides are from here: http://talks.golang.org/2012/concurrency.slide#30 ).

From the example "Restoring Sequence", I keep getting an error:

prog.go:21: cannot use Message literal (type Message) as type string in send
prog.go:43: msg1.str undefined (type string has no field or method str)
prog.go:44: msg2.str undefined (type string has no field or method str)
prog.go:46: msg1.wait undefined (type string has no field or method wait)
prog.go:47: msg2.wait undefined (type string has no field or method wait)

Here is my code

type Message struct {
	str string
	wait chan bool	
}

func boring(msg string) <- chan string {
	c := make(chan string)
	waitForIt := make(chan bool)
	
	go func() {
		for i := 0; ; i++ {
			c <- Message{ fmt.Sprintf("%s: %d", msg, i), waitForIt }
			time.Sleep(time.Duration(rand.Intn(1e3)) * time.Millisecond)
			<-waitForIt
		}	
	}()
	return c	
}

func fanIn(input1, input2 <-chan string) <-chan string {
	c := make(chan string)
	go func() { for { c <- <-input1 } }()
	go func() { for { c <- <-input2 } }()
	return c
}

func main() {
	c := fanIn(boring("joe"), boring("ann"))
	
	for i := 0; i < 10; i++ {
		//fmt.Printf("You say %q\n", <-c)
		//fmt.Println(<-c)
		msg1 := <-c; fmt.Println(msg1.str)
		msg2 := <-c; fmt.Println(msg2.str)
		
		msg1.wait <- true
		msg2.wait <- true
	
		fmt.Println("--------------")
	}
		
	
	fmt.Println("Your boring, im leaving")
}

and my Go playground: http://play.golang.org/p/6WQE0PUF7J

What am I doing wrong?.

Sorry I'm new to Go and I would like to learn it because I want to move all of my apps and work apps from node.js to Go.

Thank you!

The YouTube talk explains it a bit better.

What your actual problem is, is that you're half-way through the code sample. It starts off with string channels - then moves on to Message channels.

I have fixed this up for you. See this playground link: http://play.golang.org/p/R60AJWzr0t

Basically, it becomes this now. Notice how all of the channels are now Message channels, not string channels.

type Message struct {
str  string
wait chan bool
}
func boring(msg string) <-chan Message {
c := make(chan Message)
waitForIt := make(chan bool)
go func() {
for i := 0; ; i++ {
c <- Message{fmt.Sprintf("%s: %d", msg, i), waitForIt}
time.Sleep(time.Duration(rand.Intn(1e3)) * time.Millisecond)
<-waitForIt
}
}()
return c
}
func fanIn(input1, input2 <-chan Message) <-chan Message {
c := make(chan Message)
go func() {
for {
c <- <-input1
}
}()
go func() {
for {
c <- <-input2
}
}()
return c
}
func main() {
c := fanIn(boring("joe"), boring("ann"))
for i := 0; i < 10; i++ {
//fmt.Printf("You say %q\n", <-c)
//fmt.Println(<-c)
msg1 := <-c
fmt.Println(msg1.str)
msg2 := <-c
fmt.Println(msg2.str)
msg1.wait <- true
msg2.wait <- true
fmt.Println("--------------")
}
fmt.Println("Your boring, im leaving")
}

What your errors mean:

> prog.go:21: cannot use Message literal (type Message) as type string in send

You're sending a Message instance on the string channel on line 21. Change it to chan Message (and all of the other channels that are string channels currently).

> prog.go:43: msg1.str undefined (type string has no field or method str)

.. and the rest, are because you have a string channel, and each time you pop something from the channel, its a string - not a Message.