Add get() and list() API

This patch is porting AMB get() and list() API.

Change-Id: Ic1d391219f1d64ab127bc1977a5b198abe0fc94b
Signed-off-by: Yuichi Kusakabe <yuichi.kusakabe@jp.fujitsu.com>

3 files changed, 114 insertions, 0 deletions

diff --git a/low-can-binding/binding/low-can-cb.cpp b/low-can-binding/binding/low-can-cb.cpp
index 0bb55038..1b7ce107 100644
--- a/low-can-binding/binding/low-can-cb.cpp
+++ b/low-can-binding/binding/low-can-cb.cpp
@@ -514,3 +514,113 @@ void write(struct afb_req request)
 	else
 		afb_req_fail(request, "error", NULL);
 }
+
+static struct json_object *get_signals_value(const std::string& name)
+{
+	struct utils::signals_found sf;
+	struct json_object *ans = nullptr;
+
+	openxc_DynamicField search_key = build_DynamicField(name);
+	sf = utils::signals_manager_t::instance().find_signals(search_key);
+
+	if (sf.can_signals.empty())
+	{
+		AFB_WARNING("No signal(s) found for %s.", name.c_str());
+		return NULL;
+	}
+	ans = json_object_new_array();
+	for(const auto& sig: sf.can_signals)
+	{
+		struct json_object *jobj = json_object_new_object();
+		json_object_object_add(jobj, "event", json_object_new_string(sig->get_name().c_str()));
+		json_object_object_add(jobj, "value", json_object_new_double(sig->get_last_value()));
+		json_object_array_add(ans, jobj);
+	}
+
+	return ans;
+}
+void get(struct afb_req request)
+{
+	int rc = 0;
+	struct json_object* args = nullptr,
+		*json_name = nullptr;
+	json_object *ans = nullptr;
+
+	args = afb_req_json(request);
+
+	// Process about Raw CAN message on CAN bus directly
+	if (args != nullptr &&
+		(json_object_object_get_ex(args, "event", &json_name) && json_object_is_type(json_name, json_type_string) ))
+	{
+		ans = get_signals_value(json_object_get_string(json_name));
+		if (!ans)
+			rc = -1;
+	}
+	else
+	{
+		AFB_ERROR("Request argument malformed. Please use the following syntax:");
+		rc = -1;
+	}
+
+	if (rc >= 0)
+		afb_req_success(request, ans, NULL);
+	else
+		afb_req_fail(request, "error", NULL);
+}
+
+
+static struct json_object *list_can_message(const std::string& name)
+{
+	struct utils::signals_found sf;
+	struct json_object *ans = nullptr;
+
+	openxc_DynamicField search_key = build_DynamicField(name);
+	sf = utils::signals_manager_t::instance().find_signals(search_key);
+
+	if (sf.can_signals.empty() && sf.diagnostic_messages.empty())
+	{
+		AFB_WARNING("No signal(s) found for %s.", name.c_str());
+		return NULL;
+	}
+	ans = json_object_new_array();
+	for(const auto& sig: sf.can_signals)
+	{
+		json_object_array_add(ans,
+			json_object_new_string(sig->get_name().c_str()));
+	}
+	for(const auto& sig: sf.diagnostic_messages)
+	{
+		json_object_array_add(ans,
+			json_object_new_string(sig->get_name().c_str()));
+	}
+
+	return ans;
+}
+
+void list(struct afb_req request)
+{
+	int rc = 0;
+	json_object *ans = nullptr;
+	struct json_object* args = nullptr,
+		*json_name = nullptr;
+	args = afb_req_json(request);
+	const char *name;
+	if ((args != nullptr) &&
+		(json_object_object_get_ex(args, "event", &json_name) && json_object_is_type(json_name, json_type_string)))
+	{
+		name = json_object_get_string(json_name);
+	}
+	else
+	{
+		name = "*";
+	}
+
+	ans = list_can_message(name);
+	if (!ans)
+		rc = -1;
+
+	if (rc >= 0)
+		afb_req_success(request, ans, NULL);
+	else
+		afb_req_fail(request, "error", NULL);
+}
diff --git a/low-can-binding/binding/low-can-hat.cpp b/low-can-binding/binding/low-can-hat.cpp
index ae16f5d0..2b5baa36 100644
--- a/low-can-binding/binding/low-can-hat.cpp
+++ b/low-can-binding/binding/low-can-hat.cpp
@@ -57,6 +57,8 @@ extern "C"
 		{ .verb= "subscribe", .callback= subscribe, .auth= NULL, .info="Let subscribe to signals", .session= AFB_SESSION_NONE},
 		{ .verb= "unsubscribe", .callback= unsubscribe, .auth= NULL, .info="Let unsubscribe signals", .session= AFB_SESSION_NONE},
 		{ .verb= "write", .callback= write, .auth= &afb_auth_loa_1, .info="Write a single CAN message on a CAN bus", .session= AFB_SESSION_LOA_1},
+		{ .verb= "get", .callback= get, .auth=NULL, .info="get a current value of CAN message", .session= AFB_SESSION_NONE},
+		{ .verb= "list",.callback= list, .auth=NULL, .info="get a supported CAN message list", .session= AFB_SESSION_NONE},
 		{ .verb= NULL, .callback= NULL, .auth= NULL, .info=NULL, .session= 0}
 	};
 
diff --git a/low-can-binding/binding/low-can-hat.hpp b/low-can-binding/binding/low-can-hat.hpp
index 162a8e59..1f550a82 100644
--- a/low-can-binding/binding/low-can-hat.hpp
+++ b/low-can-binding/binding/low-can-hat.hpp
@@ -40,3 +40,5 @@ void auth(struct afb_req request);
 void subscribe(struct afb_req request);
 void unsubscribe(struct afb_req request);
 void write(struct afb_req request);
+void get(struct afb_req request);
+void list(struct afb_req request);