59 lines
1.9 KiB
GDScript
59 lines
1.9 KiB
GDScript
extends Node
|
|
signal completed(id: int, ok: bool)
|
|
signal status_changed(message: String)
|
|
const URL := "http://127.0.0.1:8765"
|
|
var pending: Array[Dictionary] = []
|
|
var serial := 0
|
|
var busy := false
|
|
var heartbeat: HTTPRequest
|
|
|
|
func _ready() -> void:
|
|
process_mode = Node.PROCESS_MODE_ALWAYS
|
|
heartbeat = HTTPRequest.new()
|
|
heartbeat.timeout = 1.0
|
|
add_child(heartbeat)
|
|
var timer := Timer.new()
|
|
timer.wait_time = 1.0
|
|
timer.timeout.connect(_heartbeat)
|
|
add_child(timer)
|
|
timer.start()
|
|
|
|
func _heartbeat() -> void:
|
|
if heartbeat.get_http_client_status() == HTTPClient.STATUS_DISCONNECTED:
|
|
heartbeat.request(URL + "/heartbeat", [], HTTPClient.METHOD_POST, "{}")
|
|
|
|
func send(payload: Dictionary) -> bool:
|
|
if pending.size() >= 32:
|
|
status_changed.emit("GPIO output queue is full")
|
|
return false
|
|
serial += 1
|
|
var id := serial
|
|
pending.append({"id": id, "payload": payload})
|
|
_pump.call_deferred()
|
|
while true:
|
|
var result: Array = await completed
|
|
if result[0] == id: return result[1]
|
|
return false
|
|
|
|
func _pump() -> void:
|
|
if busy or pending.is_empty(): return
|
|
busy = true
|
|
var item: Dictionary = pending[0]
|
|
var request := HTTPRequest.new()
|
|
request.timeout = 2.0
|
|
add_child(request)
|
|
var ok := false
|
|
var message := "GPIO bridge unavailable — start pi_gpio_bridge.py on this Pi"
|
|
var error := request.request(URL + "/output", ["Content-Type: application/json"], HTTPClient.METHOD_POST, JSON.stringify(item.payload))
|
|
if error == OK:
|
|
var response: Array = await request.request_completed
|
|
var body = JSON.parse_string(response[3].get_string_from_utf8())
|
|
ok = response[0] == HTTPRequest.RESULT_SUCCESS and response[1] == 200 and body is Dictionary and body.get("ok", false) == true
|
|
if body is Dictionary and body.has("error"): message = str(body.error)
|
|
request.queue_free()
|
|
pending.pop_front()
|
|
busy = false
|
|
status_changed.emit("GPIO %s accepted by Pi bridge" % item.payload.pin if ok else message)
|
|
completed.emit(item.id, ok)
|
|
_pump.call_deferred()
|