/*
* Subscribes a mqtt client to a topic.
*/
enum v7_err MQTT_subscribe(struct v7 *v7, v7_val_t *res) {
enum v7_err rcode = V7_OK;
struct user_data *ud;
struct mg_connection *nc;
struct mg_mqtt_topic_expression expr;
v7_val_t topicv = v7_arg(v7, 0);
const char *topic;
nc = v7_to_foreign(v7_get(v7, v7_get_this(v7), "_nc", ~0));
if (nc == NULL) {
rcode = v7_throwf(v7, "Error", "unsupported protocol");
goto clean;
}
ud = (struct user_data *) nc->user_data;
topic = v7_to_cstring(v7, &topicv);
if (topic == NULL || strlen(topic) == 0) {
rcode = v7_throwf(v7, "TypeError", "invalid topic");
goto clean;
}
expr.topic = topic;
expr.qos = 0;
mg_mqtt_subscribe(nc, &expr, 1, ud->msgid++);
*res = v7_mk_boolean(1);
clean:
return rcode;
}
static v7_val_t WebSocket_send(struct v7 *v7, v7_val_t this_obj,
v7_val_t args) {
v7_val_t datav = v7_array_get(v7, args, 0);
v7_val_t ncv = v7_get(v7, this_obj, "_nc", ~0);
struct mg_connection *nc;
/*
* TODO(alashkin): check why v7_is_instanceof throws exception
* in case of string
*/
int is_blob = !v7_is_string(datav) && v7_is_instanceof(v7, datav, "Blob");
if (!v7_is_string(datav) && !is_blob) {
v7_throw(v7, "arg should be string or Blob");
return v7_create_undefined();
}
if (!v7_is_foreign(ncv) ||
(nc = (struct mg_connection *) v7_to_foreign(ncv)) == NULL) {
v7_throw(v7, "ws not connected");
return v7_create_undefined();
}
if (is_blob) {
_WebSocket_send_blob(v7, nc, datav);
} else {
_WebSocket_send_string(v7, nc, datav);
}
return v7_create_undefined();
}
/*
* Publishes a message to a topic.
*
* Args:
* - `topic`: topic, string.
* - `message`: message, string.
*
* Only QOS 0 is implemented at the moment.
*/
enum v7_err MQTT_publish(struct v7 *v7, v7_val_t *res) {
enum v7_err rcode = V7_OK;
struct user_data *ud;
struct mg_connection *nc;
const char *topic;
const char *message;
size_t message_len;
v7_val_t topicv = v7_arg(v7, 0), messagev = v7_arg(v7, 1);
(void) res;
topic = v7_to_cstring(v7, &topicv);
if (topic == NULL || strlen(topic) == 0) {
rcode = v7_throwf(v7, "TypeError", "invalid topic");
goto clean;
}
if (!v7_is_string(messagev)) {
rcode = v7_throwf(v7, "TypeError", "invalid message");
goto clean;
}
message = v7_get_string_data(v7, &messagev, &message_len);
nc = v7_to_foreign(v7_get(v7, v7_get_this(v7), "_nc", ~0));
if (nc == NULL) {
rcode = v7_throwf(v7, "Error", "invalid connection");
goto clean;
}
ud = (struct user_data *) nc->user_data;
mg_mqtt_publish(nc, topic, ud->msgid++, MG_MQTT_QOS(0), message, message_len);
clean:
return rcode;
}
/*
* Read the content of the UART. It does not block.
* Optional `max_len` parameter, defaults to max size_t.
*/
static enum v7_err UART_read(struct v7 *v7, v7_val_t *res) {
v7_val_t this_obj = v7_get_this(v7);
v7_val_t dev = v7_get(v7, this_obj, "_dev", ~0), maxv = v7_arg(v7, 0);
size_t max = v7_is_number(maxv) ? (size_t) v7_to_number(maxv) : ~0;
*res = sj_hal_read_uart(v7, v7_to_foreign(dev), max);
return V7_OK;
}
static struct clubby *get_clubby(struct v7 *v7, v7_val_t obj) {
v7_val_t clubbyv = v7_get(v7, obj, s_clubby_prop, sizeof(s_clubby_prop));
if (!v7_is_foreign(clubbyv)) {
return 0;
}
return v7_to_foreign(clubbyv);
}
static v7_val_t WebSocket_close(struct v7 *v7, v7_val_t this_obj,
v7_val_t args) {
struct ns_connection *nc;
v7_val_t ncv = v7_get(v7, this_obj, "_nc", ~0);
(void) args;
if (v7_is_foreign(ncv) &&
(nc = (struct ns_connection *) v7_to_foreign(ncv)) != NULL) {
nc->flags |= NSF_CLOSE_IMMEDIATELY;
}
return v7_create_undefined();
}
static enum v7_err UART_write(struct v7 *v7, v7_val_t *res) {
v7_val_t this_obj = v7_get_this(v7);
v7_val_t dev = v7_get(v7, this_obj, "_dev", ~0), data = v7_arg(v7, 0);
size_t len;
const char *d = v7_get_string_data(v7, &data, &len);
(void) v7;
(void) this_obj;
sj_hal_write_uart(v7_to_foreign(dev), d, len);
return V7_OK;
}
/*
* Regiter a callback to be invoked when there is at least N bytes available.
* N defaults to maxint if undefined
*/
static enum v7_err UART_recv(struct v7 *v7, v7_val_t *res) {
v7_val_t this_obj = v7_get_this(v7);
v7_val_t cb = v7_arg(v7, 0);
v7_val_t wantv = v7_arg(v7, 1);
v7_val_t udv = v7_get(v7, this_obj, "_ud", ~0);
size_t want = v7_is_number(wantv) ? (size_t) v7_to_number(wantv) : ~0;
struct user_data *ud = (struct user_data *) v7_to_foreign(udv);
ud->cb = cb;
v7_own(v7, &ud->cb);
ud->want = want;
/* TODO(mkm): trigger cb if there is already something in the buffer */
return V7_OK;
}
static v7_val_t WebSocket_send(struct v7 *v7, v7_val_t this_obj,
v7_val_t args) {
v7_val_t datav = v7_array_get(v7, args, 0);
v7_val_t ncv = v7_get(v7, this_obj, "_nc", ~0);
struct ns_connection *nc;
const char *data;
size_t len;
if (!v7_is_string(datav)) {
v7_throw(v7, "non string data not implemented");
return v7_create_undefined();
}
if (!v7_is_foreign(ncv) ||
(nc = (struct ns_connection *) v7_to_foreign(ncv)) == NULL) {
v7_throw(v7, "ws not connected");
return v7_create_undefined();
}
data = v7_to_string(v7, &datav, &len);
ns_send_websocket_frame(nc, WEBSOCKET_OP_TEXT, data, len);
return v7_create_undefined();
}
/*
* Returns mongoose connection saved in the user data object `obj`.
*
* For some details on `obj`, see `struct user_data::obj`
*/
static struct mg_connection *get_mgconn_obj(struct v7 *v7, v7_val_t obj) {
v7_val_t _c = v7_get(v7, obj, "_c", ~0);
return (struct mg_connection *) v7_to_foreign(_c);
}
