// Assemble basic arithmetic operations requests.
func arithmetic() ([]string, error) {
// Take a random value for A and B up to 1000.
maxValue := 1000
a, _ := utilities.Random(maxValue)
b, _ := utilities.Random(maxValue)
// Now we select a random operation.
operationsList := []string{"sum", "sub", "mult", "div"}
index, err := utilities.Random(len(operationsList))
if err != nil {
return nil, err
}
operation := operationsList[index]
// Request ready, expect something like [mult 3 2]
return []string{operation, strconv.Itoa(a), strconv.Itoa(b)}, nil
}
// A encode text request.
func encode() ([]string, error) {
// Same story once again.
index, err := utilities.Random(len(content))
if err != nil {
return nil, err
}
// eg.: [encode hello, world]
return []string{"encode", content[index]}, nil
}
// A reverse text request.
func reverse() ([]string, error) {
// Get a random number between zero and the content length,
// which is equivalent to a line at text.in.
index, err := utilities.Random(len(content))
if err != nil {
return nil, err
}
// eg.: [reverse Papa Americano]
return []string{"reverse", content[index]}, nil
}
// Randomly choose a message type and call the proper function to build
// that message. Then return the message back to Sender function.
func messenger() ([]string, error) {
// The basic tasks that the octopus are prepared to handle.
taskList := []string{"arithmetic", "fibonacci", "reverse", "encode"}
// Choose a random index from taskList
index, err := utilities.Random(len(taskList))
if err != nil {
// If you are here and you don't know why, check if taskList is empty.
return nil, err
}
// Hold the message to be sent.
var msg []string
// Depending on which task has been chosen,
// we call the corresponding assembler function.
switch taskList[index] {
case "arithmetic":
msg, err = arithmetic()
if err != nil {
return nil, err
}
case "fibonacci":
msg = fibonacci()
case "reverse":
msg, err = reverse()
if err != nil {
return nil, err
}
case "encode":
msg, err = encode()
if err != nil {
return nil, err
}
}
return msg, nil
}
// A Fibonacci request.
func fibonacci() []string {
// Fib 30 should be big enough for our case.
n, _ := utilities.Random(30)
return []string{"fibonacci", strconv.Itoa(n)}
}