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// vim: shiftwidth=4 tabstop=4 noexpandtab
package main
import (
"log"
"os/exec"
"io"
)
type Camera struct {
statemachine Machine
}
func NewCamera() Camera {
return Camera{
statemachine: Machine{
name: "camera",
initial: "idle",
states: StateMap{
"idle": MachineState{
on: TransitionMap{
"take_single_picture": MachineTransition{
to: "single_picture",
},
},
},
"single_picture": MachineState{
on: TransitionMap{
"single_picture_taken": MachineTransition{
to: "idle",
},
},
},
},
api: make(chan string),
state_listeners: make([]*(chan string), 0),
hook: runCameraHooks,
},
}
}
func runCameraHooks(last string, next string, m *Machine) {
if last == "idle" && next == "single_picture" {
go singlePicture(m)
}
}
func singlePicture(m *Machine) {
// create command
var cmd *exec.Cmd
if !debug {
cmd = exec.Command("python3", "/usr/lib/python3.9/site-packages/birdscan/")
} else {
cmd = exec.Command("python3", "../python/birdscan", "--debug")
}
// connect stdout of python process
stdout,err := cmd.StdoutPipe()
if err != nil {
log.Print(err)
}
defer stdout.Close()
// run command
err = cmd.Start()
if err != nil {
log.Print(err)
}
data,err := io.ReadAll(stdout)
if err != nil {
log.Print(err)
}
err = cmd.Wait() // wait until command execution and io is complete
if err != nil {
log.Print(err)
}
// process result
log.Println(string(data))
m.SendEvent("single_picture_taken")
}
func (cam *Camera) run() {
cam.statemachine.Run()
}
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