Subscription by plugin to signals

Change-Id: Icb923f87df2be8eb664106bc9077b3a8221dd3ce
Signed-off-by: Romain Forlot <romain.forlot@iot.bzh>

1 files changed, 157 insertions, 0 deletions

diff --git a/plugins/low-can.c b/plugins/low-can.c
new file mode 100644
index 0000000..3988026
--- /dev/null
+++ b/plugins/low-can.c
@@ -0,0 +1,157 @@
+/*
+ * Copyright (C) 2016 "IoT.bzh"
+ * Author Romain Forlot <romain.forlot@iot.bzh>
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+*/
+
+#define _GNU_SOURCE  // needed for vasprintf
+
+#define AFB_BINDING_VERSION 2
+#include <afb/afb-binding.h>
+#include <systemd/sd-event.h>
+#include <json-c/json_object.h>
+#include <stdbool.h>
+#include <string.h>
+
+#include "ctl-plugin.h"
+#include "wrap-json.h"
+
+CTLP_REGISTER("low-can");
+
+typedef struct {
+	bool door;
+	bool window;
+} doorT;
+
+typedef struct {
+	doorT* front_left;
+	doorT* front_right;
+	doorT* rear_left;
+	doorT* rear_right;
+} allDoorsCtxT;
+
+// Call at initialisation time
+CTLP_ONLOAD(plugin, api) {
+	allDoorsCtxT *allDoorCtx = (allDoorsCtxT*)calloc (1, sizeof(allDoorsCtxT));
+	memset(allDoorCtx, 0, sizeof(allDoorsCtxT));
+
+	AFB_NOTICE ("Low-can door plugin: label='%s' version='%s' info='%s'", plugin->label, plugin->version, plugin->info);
+	return (void*)allDoorCtx;
+}
+
+CTLP_CAPI (subscribeToLow, source, argsJ, eventJ, context) {
+	json_object* signalArrayJ = NULL, *subscribeArgsJ = NULL, *subscribeFilterJ = NULL, *responseJ = NULL;
+	const char* unit = NULL;
+	double frequency = 0;
+	int err = 0;
+
+	err = wrap_json_unpack(eventJ, "{so,s?s,s?F !}",
+		"signal", &signalArrayJ,
+		"unit", &unit,
+		"frequency", &frequency);
+	if(err)
+	{
+		AFB_ERROR("Problem to unpack JSON object eventJ: %s",
+		json_object_to_json_string(eventJ));
+		return err;
+	}
+
+	if(frequency >= 0)
+	{
+		wrap_json_pack(&subscribeFilterJ, "{sf}", "frequency", frequency);
+	}
+
+	for (int idx = 0; idx < json_object_array_length(signalArrayJ); idx++)
+	{
+		json_object* aSignalJ = json_object_array_get_idx(signalArrayJ, idx);
+		err = wrap_json_pack(&subscribeArgsJ, "{ss, so*}",
+		"event", json_object_get_string(aSignalJ),
+		"filter", subscribeFilterJ);
+		if(err)
+		{
+			AFB_ERROR("Error building subscription query object");
+			return err;
+		}
+		AFB_DEBUG("Calling subscribe with %s", json_object_to_json_string_ext(subscribeArgsJ, JSON_C_TO_STRING_PRETTY));
+		err = afb_service_call_sync("low-can", "subscribe", subscribeArgsJ, &responseJ);
+		if(err)
+		{
+			AFB_ERROR("Can't find api 'low-can'");
+			return err;
+		}
+	}
+
+	return err;
+}
+
+CTLP_CAPI (isOpen, source, argsJ, eventJ, context) {
+
+	const char* eventName;
+	json_object *eventStatus = NULL;
+	long long int *timestamp = NULL;
+	allDoorsCtxT *ctx=(allDoorsCtxT*)context;
+
+	AFB_DEBUG("Here is the situation: source:%s, args:%s, event:%s,\n fld: %s, flw: %s, frd: %s, frw: %s, rld: %s, rlw: %s, rrd: %s, rrw: %s",
+		source->label,
+		json_object_to_json_string(argsJ),
+		json_object_to_json_string(eventJ),
+		ctx->front_left->door ? "true":"false",
+		ctx->front_left->window ? "true":"false",
+		ctx->front_right->door ? "true":"false",
+		ctx->front_right->window ? "true":"false",
+		ctx->rear_left->door ? "true":"false",
+		ctx->rear_left->window ? "true":"false",
+		ctx->rear_right->door ? "true":"false",
+		ctx->rear_right->window ? "true":"false"
+	);
+
+	int err = wrap_json_unpack(eventJ, "{ss,sb,s?F}",
+		"event", &eventName,
+		"value", &eventStatus,
+		"timestamp", &timestamp);
+	if(err)
+	{
+		AFB_ERROR("Error parsing event %s", json_object_to_json_string(eventJ));
+		return -1;
+	}
+
+	if(strcasestr(eventName, "front_left"))
+	{
+		if(strcasestr(eventName, "door")) {ctx->front_left->door = eventStatus;}
+		else if(strcasestr(eventName, "window")) {ctx->front_left->window = eventStatus;}
+		else {AFB_WARNING("Unexpected behavior, this '%s' is not a door ! ", json_object_to_json_string(eventJ));}
+	}
+	else if(strcasestr(eventName, "front_right"))
+	{
+		if(strcasestr(eventName, "door")) {ctx->front_right->door = eventStatus;}
+		else if(strcasestr(eventName, "window")) {ctx->front_right->window = eventStatus;}
+		else {AFB_WARNING("Unexpected behavior, this '%s' is not a door ! ", json_object_to_json_string(eventJ));}
+	}
+	else if(strcasestr(eventName, "rear_left"))
+	{
+		if(strcasestr(eventName, "door")) {ctx->rear_left->door = eventStatus;}
+		else if(strcasestr(eventName, "window")) {ctx->rear_left->window = eventStatus;}
+		else {AFB_WARNING("Unexpected behavior, this '%s' is not a door ! ", json_object_to_json_string(eventJ));}
+	}
+	else if(strcasestr(eventName, "rear_right"))
+	{
+		if(strcasestr(eventName, "door")) {ctx->rear_right->door = eventStatus;}
+		else if(strcasestr(eventName, "window")) {ctx->rear_right->window = eventStatus;}
+		else {AFB_WARNING("Unexpected behavior, this '%s' is not a door ! ", json_object_to_json_string(eventJ));}
+	}
+	else {AFB_WARNING("Unexpected behavior, this '%s' is not a door ! ", json_object_to_json_string(eventJ));}
+
+	return 0;
+}