Initial commit

Change-Id: I2bb38bffdd92602659670901b8442201b7c56214
Signed-off-by: Romain Forlot <romain.forlot@iot.bzh>

1 files changed, 1071 insertions, 0 deletions

diff --git a/signal-composer-binding/ctl-lua.c b/signal-composer-binding/ctl-lua.c
new file mode 100644
index 0000000..e8e48fa
--- /dev/null
+++ b/signal-composer-binding/ctl-lua.c
@@ -0,0 +1,1071 @@
+/*
+ * Copyright (C) 2016 "IoT.bzh"
+ * Author Fulup Ar Foll <fulup@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.
+ * ref:
+ *  (manual) https://www.lua.org/manual/5.3/manual.html
+ *  (lua->C) http://www.troubleshooters.com/codecorn/lua/lua_c_calls_lua.htm#_Anatomy_of_a_Lua_Call
+ *  (lua/C Var) http://acamara.es/blog/2012/08/passing-variables-from-lua-5-2-to-c-and-vice-versa/
+ *  (Lua/C Lib)https://john.nachtimwald.com/2014/07/12/wrapping-a-c-library-in-lua/
+ *  (Lua/C Table) https://gist.github.com/SONIC3D/10388137
+ *  (Lua/C Nested table) https://stackoverflow.com/questions/45699144/lua-nested-table-from-lua-to-c
+ *  (Lua/C Wrapper) https://stackoverflow.com/questions/45699950/lua-passing-handle-to-function-created-with-newlib
+ *
+ */
+
+#define _GNU_SOURCE
+#include <stdio.h>
+#include <unistd.h>
+#include <sys/stat.h>
+#include <string.h>
+#include <filescan-utils.h>
+#include <wrap-json.h>
+
+#include "ctl-lua.h"
+
+#define LUA_FIST_ARG 2  // when using luaL_newlib calllback receive libtable as 1st arg
+#define LUA_MSG_MAX_LENGTH 512
+#define JSON_ERROR (json_object*)-1
+
+#define CTX_MAGIC 123456789
+#define CTX_TOKEN "AFB_ctx"
+
+static afb_req NULL_AFBREQ = {};
+
+static  lua_State* luaState;
+
+typedef struct {
+	char *name;
+	int  count;
+	afb_event event;
+} LuaAfbEvent;
+static LuaAfbEvent *luaDefaultEvt;
+
+typedef struct {
+	int ctxMagic;
+	afb_req request;
+	void *handle;
+	char *info;
+} LuaAfbContextT;
+
+typedef struct {
+  const char *callback;
+  json_object *context;
+  void *handle;
+} LuaCallServiceT;
+
+typedef enum {
+	AFB_MSG_INFO,
+	AFB_MSG_WARNING,
+	AFB_MSG_NOTICE,
+	AFB_MSG_DEBUG,
+	AFB_MSG_ERROR,
+} LuaAfbMessageT;
+
+/*
+ * Note(Fulup): I fail to use luaL_setmetatable and replaced it with a simple opaque
+ * handle while waiting for someone smarter than me to find a better solution
+ *  https://stackoverflow.com/questions/45596493/lua-using-lua-newuserdata-from-lua-pcall
+ */
+
+static LuaAfbContextT *LuaCtxCheck (lua_State *luaState, int index) {
+  LuaAfbContextT *afbContext;
+  //luaL_checktype(luaState, index, LUA_TUSERDATA);
+  //afbContext = (LuaAfbContextT *)luaL_checkudata(luaState, index, CTX_TOKEN);
+  luaL_checktype(luaState, index, LUA_TLIGHTUSERDATA);
+  afbContext = (LuaAfbContextT *) lua_touserdata(luaState, index);
+  if (afbContext == NULL && afbContext->ctxMagic != CTX_MAGIC) {
+	luaL_error(luaState, "Fail to retrieve user data context=%s", CTX_TOKEN);
+	AFB_ERROR ("afbContextCheck error retrieving afbContext");
+	return NULL;
+  }
+  return afbContext;
+}
+
+static LuaAfbContextT *LuaCtxPush (lua_State *luaState, afb_req request, void *handle, const char* info) {
+  // LuaAfbContextT *afbContext = (LuaAfbContextT *)lua_newuserdata(luaState, sizeof(LuaAfbContextT));
+  // luaL_setmetatable(luaState, CTX_TOKEN);
+  LuaAfbContextT *afbContext = (LuaAfbContextT *)calloc(1, sizeof(LuaAfbContextT));
+  lua_pushlightuserdata(luaState, afbContext);
+  if (!afbContext) {
+	AFB_ERROR ("LuaCtxPush fail to allocate user data context");
+	return NULL;
+  }
+  afbContext->ctxMagic=CTX_MAGIC;
+  afbContext->info=strdup(info);
+  afbContext->request= request;
+  afbContext->handle= handle;
+  return afbContext;
+}
+
+static void LuaCtxFree (LuaAfbContextT *afbContext) {
+	free(afbContext->info);
+	free(afbContext);
+}
+
+// Push a json structure on the stack as a LUA table
+static int LuaPushArgument (json_object *argsJ) {
+
+	//AFB_NOTICE("LuaPushArgument argsJ=%s", json_object_get_string(argsJ));
+
+	json_type jtype= json_object_get_type(argsJ);
+	switch (jtype) {
+		case json_type_object: {
+			lua_newtable (luaState);
+			json_object_object_foreach (argsJ, key, val) {
+				int done = LuaPushArgument (val);
+				if (done) {
+					lua_setfield(luaState,-2, key);
+				}
+			}
+			break;
+		}
+		case json_type_array: {
+			int length= json_object_array_length(argsJ);
+			lua_newtable (luaState);
+			for (int idx=0; idx < length; idx ++) {
+				json_object *val=json_object_array_get_idx(argsJ, idx);
+				LuaPushArgument (val);
+				lua_seti (luaState,-2, idx);
+			}
+			break;
+		}
+		case json_type_int:
+			lua_pushinteger(luaState, json_object_get_int(argsJ));
+			break;
+		case json_type_string:
+			lua_pushstring(luaState, json_object_get_string(argsJ));
+			break;
+		case json_type_boolean:
+			lua_pushboolean(luaState, json_object_get_boolean(argsJ));
+			break;
+		case json_type_double:
+			lua_pushnumber(luaState, json_object_get_double(argsJ));
+			break;
+		case json_type_null:
+			AFB_WARNING("LuaPushArgument: NULL object type %s", json_object_get_string(argsJ));
+			return 0;
+			break;
+
+		default:
+			AFB_ERROR("LuaPushArgument: unsupported Json object type %s", json_object_get_string(argsJ));
+			return 0;
+	}
+	return 1;
+}
+
+static  json_object *LuaPopOneArg (lua_State* luaState, int idx);
+
+// Move a table from Internal Lua representation to Json one
+// Numeric table are transformed in json array, string one in object
+// Mix numeric/string key are not supported
+static json_object *LuaTableToJson (lua_State* luaState, int index) {
+	#define LUA_KEY_INDEX -2
+	#define LUA_VALUE_INDEX -1
+
+	int idx;
+	int tableType;
+	json_object *tableJ= NULL;
+
+	lua_pushnil(luaState); // 1st key
+	if (index < 0) index--;
+	for (idx=1; lua_next(luaState, index) != 0; idx++) {
+
+		// uses 'key' (at index -2) and 'value' (at index -1)
+		if (lua_type(luaState,LUA_KEY_INDEX) == LUA_TSTRING) {
+
+			if (!tableJ) {
+				tableJ= json_object_new_object();
+				tableType=LUA_TSTRING;
+			} else if (tableType != LUA_TSTRING){
+				AFB_ERROR("MIX Lua Table with key string/numeric not supported");
+				return NULL;
+			}
+
+			const char *key= lua_tostring(luaState, LUA_KEY_INDEX);
+			json_object *argJ= LuaPopOneArg(luaState, LUA_VALUE_INDEX);
+			json_object_object_add(tableJ, key, argJ);
+
+		} else {
+			if (!tableJ) {
+				tableJ= json_object_new_array();
+				tableType=LUA_TNUMBER;
+			} else if(tableType != LUA_TNUMBER) {
+				AFB_ERROR("MIX Lua Table with key numeric/string not supported");
+				return NULL;
+			}
+
+			json_object *argJ= LuaPopOneArg(luaState, LUA_VALUE_INDEX);
+			json_object_array_add(tableJ, argJ);
+		}
+
+
+		lua_pop(luaState, 1); // removes 'value'; keeps 'key' for next iteration
+	}
+
+	// Query is empty free empty json object
+	if (idx == 1) {
+		json_object_put(tableJ);
+		return NULL;
+	}
+	return tableJ;
+}
+
+static  json_object *LuaPopOneArg (lua_State* luaState, int idx) {
+	json_object *value=NULL;
+
+	int luaType = lua_type(luaState, idx);
+	switch(luaType)  {
+		case LUA_TNUMBER: {
+			lua_Number number= lua_tonumber(luaState, idx);;
+			int nombre = (int)number; // evil trick to determine wether n fits in an integer. (stolen from ltcl.c)
+			if (number == nombre) {
+				value= json_object_new_int((int)number);
+			} else {
+				value= json_object_new_double(number);
+			}
+			break;
+		}
+		case LUA_TBOOLEAN:
+			value=  json_object_new_boolean(lua_toboolean(luaState, idx));
+			break;
+		case LUA_TSTRING:
+		value=  json_object_new_string(lua_tostring(luaState, idx));
+			break;
+		case LUA_TTABLE:
+			value= LuaTableToJson(luaState, idx);
+			break;
+		case LUA_TNIL:
+			value=json_object_new_string("nil") ;
+			break;
+		case LUA_TUSERDATA:
+			value=json_object_new_int64((int64_t)lua_touserdata(luaState, idx)); // store userdata as int !!!
+			break;
+
+		default:
+			AFB_NOTICE ("LuaPopOneArg: script returned Unknown/Unsupported idx=%d type:%d/%s", idx, luaType, lua_typename(luaState, luaType));
+			value=NULL;
+	}
+
+	return value;
+}
+
+static json_object *LuaPopArgs (lua_State* luaState, int start) {
+	json_object *responseJ;
+
+	int stop = lua_gettop(luaState);
+	if(stop-start <0) return NULL;
+
+	// start at 2 because we are using a function array lib
+	if (start == stop) {
+		responseJ=LuaPopOneArg (luaState, start);
+	} else {
+		// loop on remaining return arguments
+		responseJ= json_object_new_array();
+		for (int idx=start; idx <= stop; idx++) {
+			json_object *argJ=LuaPopOneArg (luaState, idx);
+			if (!argJ) goto OnErrorExit;
+			json_object_array_add(responseJ, argJ);
+	}
+	}
+
+	return responseJ;
+
+  OnErrorExit:
+	return NULL;
+}
+
+
+static int LuaFormatMessage(lua_State* luaState, LuaAfbMessageT action) {
+	char *message;
+
+	json_object *responseJ= LuaPopArgs(luaState, LUA_FIST_ARG);
+
+	if (!responseJ) {
+		luaL_error(luaState,"LuaFormatMessage empty message");
+		goto OnErrorExit;
+	}
+
+	// if we have only on argument just return the value.
+	if (json_object_get_type(responseJ)!=json_type_array || json_object_array_length(responseJ) <2) {
+		message= (char*)json_object_get_string(responseJ);
+		goto PrintMessage;
+	}
+
+	// extract format and push all other parameter on the stack
+	message = alloca (LUA_MSG_MAX_LENGTH);
+	const char *format = json_object_get_string(json_object_array_get_idx(responseJ, 0));
+
+	int arrayIdx=1;
+	int targetIdx=0;
+
+	for (int idx=0; format[idx] !='\0'; idx++) {
+
+		if (format[idx]=='%' && format[idx] !='\0') {
+			json_object *slotJ= json_object_array_get_idx(responseJ, arrayIdx);
+			//if (slotJ) AFB_NOTICE("**** idx=%d slotJ=%s", arrayIdx, json_object_get_string(slotJ));
+
+
+			switch (format[++idx]) {
+				case 'd':
+					if (slotJ) targetIdx += snprintf (&message[targetIdx], LUA_MSG_MAX_LENGTH-targetIdx,"%d", json_object_get_int(slotJ));
+					else  targetIdx += snprintf (&message[targetIdx], LUA_MSG_MAX_LENGTH-targetIdx,"nil");
+					arrayIdx++;
+					break;
+				case 'f':
+					if (slotJ) targetIdx += snprintf (&message[targetIdx], LUA_MSG_MAX_LENGTH-targetIdx,"%f", json_object_get_double(slotJ));
+					else  targetIdx += snprintf (&message[targetIdx], LUA_MSG_MAX_LENGTH-targetIdx,"nil");
+					arrayIdx++;
+					break;
+
+				case'%':
+					message[targetIdx]='%';
+					targetIdx++;
+					break;
+
+				case 's':
+				default:
+					if (slotJ) targetIdx += snprintf (&message[targetIdx], LUA_MSG_MAX_LENGTH-targetIdx,"%s", json_object_get_string(slotJ));
+					else  targetIdx += snprintf (&message[targetIdx], LUA_MSG_MAX_LENGTH-targetIdx,"nil");
+					arrayIdx++;
+				}
+
+		} else {
+			if (targetIdx >= LUA_MSG_MAX_LENGTH) {
+				AFB_WARNING ("LuaFormatMessage: message[%s] owerverflow LUA_MSG_MAX_LENGTH=%d", format, LUA_MSG_MAX_LENGTH);
+				targetIdx --; // move backward for EOL
+				break;
+			} else {
+				message[targetIdx++] = format[idx];
+			}
+		}
+	}
+	message[targetIdx]='\0';
+
+PrintMessage:
+	switch (action) {
+		case  AFB_MSG_WARNING:
+			AFB_WARNING ("%s", message);
+			break;
+		case AFB_MSG_NOTICE:
+			AFB_NOTICE ("%s", message);
+			break;
+		case AFB_MSG_DEBUG:
+			AFB_DEBUG ("%s", message);
+			break;
+		case AFB_MSG_INFO:
+			AFB_INFO ("%s", message);
+			break;
+		case AFB_MSG_ERROR:
+		default:
+			AFB_ERROR ("%s", message);
+	}
+	return 0;  // nothing return to lua
+
+  OnErrorExit: // on argument to return (the error message)
+	return 1;
+}
+
+static int LuaPrintInfo(lua_State* luaState) {
+	int err=LuaFormatMessage (luaState, AFB_MSG_INFO);
+	return err;
+}
+
+static int LuaPrintError(lua_State* luaState) {
+	int err=LuaFormatMessage (luaState, AFB_MSG_ERROR);
+	return err; // no value return
+}
+
+static int LuaPrintWarning(lua_State* luaState) {
+	int err=LuaFormatMessage (luaState, AFB_MSG_WARNING);
+	return err;
+}
+
+static int LuaPrintNotice(lua_State* luaState) {
+	int err=LuaFormatMessage (luaState, AFB_MSG_NOTICE);
+	return err;
+}
+
+static int LuaPrintDebug(lua_State* luaState) {
+	int err=LuaFormatMessage (luaState, AFB_MSG_DEBUG);
+	return err;
+}
+
+static int LuaAfbSuccess(lua_State* luaState) {
+	LuaAfbContextT *afbContext= LuaCtxCheck(luaState, LUA_FIST_ARG);
+	if (!afbContext) goto OnErrorExit;
+
+	// ignore context argument
+	json_object *responseJ= LuaPopArgs(luaState, LUA_FIST_ARG+1);
+	if (responseJ == JSON_ERROR) return 1;
+
+	afb_req_success(afbContext->request, responseJ, NULL);
+
+	LuaCtxFree(afbContext);
+	return 0;
+
+ OnErrorExit:
+		lua_error(luaState);
+		return 1;
+}
+
+static int LuaAfbFail(lua_State* luaState) {
+	LuaAfbContextT *afbContext= LuaCtxCheck(luaState, LUA_FIST_ARG);
+	if (!afbContext) goto OnErrorExit;
+
+	json_object *responseJ= LuaPopArgs(luaState, LUA_FIST_ARG+1);
+	if (responseJ == JSON_ERROR) return 1;
+
+	afb_req_fail(afbContext->request, afbContext->info, json_object_get_string(responseJ));
+
+	LuaCtxFree(afbContext);
+	return 0;
+
+ OnErrorExit:
+		lua_error(luaState);
+		return 1;
+}
+
+static void LuaAfbServiceCB(void *handle, int iserror, struct json_object *responseJ) {
+	LuaCallServiceT *contextCB= (LuaCallServiceT*)handle;
+	int count=1;
+
+	lua_getglobal(luaState, contextCB->callback);
+
+	// push error status & response
+	lua_pushboolean(luaState, iserror);
+	count+= LuaPushArgument(responseJ);
+	count+= LuaPushArgument(contextCB->context);
+
+	int err=lua_pcall(luaState, count, LUA_MULTRET, 0);
+	if (err) {
+		AFB_ERROR ("LUA-SERICE-CB:FAIL response=%s err=%s", json_object_get_string(responseJ), lua_tostring(luaState,-1) );
+	}
+
+	free (contextCB);
+}
+
+
+static int LuaAfbService(lua_State* luaState) {
+	int count = lua_gettop(luaState);
+
+	// note: argument start at 2 because of AFB: table
+	if (count <5 || !lua_isstring(luaState, 2) || !lua_isstring(luaState, 3) || !lua_istable(luaState, 4) || !lua_isstring(luaState, 5)) {
+		lua_pushliteral (luaState, "ERROR: syntax AFB:service(api, verb, {[Lua Table]})");
+		goto OnErrorExit;
+	}
+
+	// get api/verb+query
+	const char *api = lua_tostring(luaState,2);
+	const char *verb= lua_tostring(luaState,3);
+	json_object *queryJ= LuaTableToJson(luaState, 4);
+	if (queryJ == JSON_ERROR) return 1;
+
+	LuaCallServiceT *contextCB = calloc (1, sizeof(LuaCallServiceT));
+	contextCB->callback= lua_tostring(luaState, 5);
+	contextCB->context =  LuaPopArgs(luaState, 6);
+
+	afb_service_call(api, verb, queryJ, LuaAfbServiceCB, contextCB);
+
+	return 0; // no value return
+
+  OnErrorExit:
+		lua_error(luaState);
+		return 1;
+}
+
+static int LuaAfbServiceSync(lua_State* luaState) {
+	int count = lua_gettop(luaState);
+	json_object *responseJ;
+
+	// note: argument start at 2 because of AFB: table
+	if (count <3 || !lua_isstring(luaState, 2) || !lua_isstring(luaState, 3) || !lua_istable(luaState, 4)) {
+		lua_pushliteral (luaState, "ERROR: syntax AFB:servsync(api, verb, {[Lua Table]})");
+		goto OnErrorExit;
+	}
+
+	// get api/verb+query
+	const char *api = lua_tostring(luaState,2);
+	const char *verb= lua_tostring(luaState,3);
+	json_object *queryJ= LuaTableToJson(luaState, 4);
+
+	int iserror=afb_service_call_sync (api, verb, queryJ, &responseJ);
+
+	// push error status & response
+	count=1; lua_pushboolean(luaState, iserror);
+	count+= LuaPushArgument(responseJ);
+
+	return count; // return count values
+
+  OnErrorExit:
+		lua_error(luaState);
+		return 1;
+}
+
+static int LuaAfbEventPush(lua_State* luaState) {
+	LuaAfbEvent *afbevt;
+	int index;
+
+	// if no private event handle then use default binding event
+	if (lua_islightuserdata(luaState, LUA_FIST_ARG)) {
+		afbevt = (LuaAfbEvent*) lua_touserdata(luaState, LUA_FIST_ARG);
+		index=LUA_FIST_ARG+1;
+	} else {
+		index=LUA_FIST_ARG;
+		afbevt=luaDefaultEvt;
+	}
+
+	if (!afb_event_is_valid(afbevt->event)) {
+		lua_pushliteral (luaState, "LuaAfbMakePush-Fail invalid event");
+		goto OnErrorExit;
+	}
+
+	json_object *ctlEventJ= LuaTableToJson(luaState, index);
+	if (!ctlEventJ) {
+		lua_pushliteral (luaState, "LuaAfbEventPush-Syntax is AFB:signal ([evtHandle], {lua table})");
+		goto OnErrorExit;
+	}
+
+	int done = afb_event_push(afbevt->event, ctlEventJ);
+	if (!done) {
+		lua_pushliteral (luaState, "LuaAfbEventPush-Fail No Subscriber to event");
+		AFB_ERROR ("LuaAfbEventPush-Fail name subscriber event=%s count=%d", afbevt->name, afbevt->count);
+		goto OnErrorExit;
+	}
+	afbevt->count++;
+	return 0;
+
+  OnErrorExit:
+		lua_error(luaState);
+		return 1;
+}
+
+static int LuaAfbEventSubscribe(lua_State* luaState) {
+	LuaAfbEvent *afbevt;
+
+	LuaAfbContextT *afbContext= LuaCtxCheck(luaState, LUA_FIST_ARG);
+	if (!afbContext) {
+		lua_pushliteral (luaState, "LuaAfbEventSubscribe-Fail Invalid request handle");
+		goto OnErrorExit;
+	}
+
+	// if no private event handle then use default binding event
+	if (lua_islightuserdata(luaState, LUA_FIST_ARG+1)) {
+		afbevt = (LuaAfbEvent*) lua_touserdata(luaState, LUA_FIST_ARG+1);
+	} else {
+		afbevt=luaDefaultEvt;
+	}
+
+	if (!afb_event_is_valid(afbevt->event)) {
+		lua_pushliteral (luaState, "LuaAfbMakePush-Fail invalid event handle");
+		goto OnErrorExit;
+	}
+
+	int err = afb_req_subscribe(afbContext->request, afbevt->event);
+	if (err) {
+		lua_pushliteral (luaState, "LuaAfbEventSubscribe-Fail No Subscriber to event");
+		AFB_ERROR ("LuaAfbEventPush-Fail name subscriber event=%s count=%d", afbevt->name, afbevt->count);
+		goto OnErrorExit;
+	}
+	afbevt->count++;
+	return 0;
+
+  OnErrorExit:
+		lua_error(luaState);
+		return 1;
+}
+
+static int LuaAfbEventMake(lua_State* luaState) {
+	int count = lua_gettop(luaState);
+	LuaAfbEvent *afbevt=calloc(1,sizeof(LuaAfbEvent));
+
+	if (count != LUA_FIST_ARG || !lua_isstring(luaState, LUA_FIST_ARG)) {
+		lua_pushliteral (luaState, "LuaAfbEventMake-Syntax is evtHandle= AFB:event ('myEventName')");
+		goto OnErrorExit;
+	}
+
+	// event name should be the only argument
+	afbevt->name= strdup (lua_tostring(luaState,LUA_FIST_ARG));
+
+	// create a new binder event
+	afbevt->event = afb_daemon_make_event(afbevt->name);
+	if (!afb_event_is_valid(afbevt->event)) {
+		lua_pushliteral (luaState, "LuaAfbEventMake-Fail to Create Binder event");
+		goto OnErrorExit;
+	}
+
+	// push event handler as a LUA opaque handle
+	lua_pushlightuserdata(luaState, afbevt);
+	return 1;
+
+  OnErrorExit:
+		lua_error(luaState);
+		return 1;
+}
+
+// Function call from LUA when lua2c plugin L2C is used
+int Lua2cWrapper(lua_State* luaState, char *funcname, Lua2cFunctionT callback, void *context) {
+
+	json_object *argsJ= LuaPopArgs(luaState, LUA_FIST_ARG+1);
+	int response = (*callback) (funcname, argsJ, context);
+
+	// push response to LUA
+	lua_pushinteger(luaState, response);
+	return 1;
+}
+
+// Generated some fake event based on watchdog/counter
+int LuaCallFunc (DispatchSourceT source, DispatchActionT *action, json_object *queryJ) {
+
+	int err, count;
+
+	json_object* argsJ  = action->argsJ;
+	const char*  func   = action->call;
+
+	// load function (should exist in CONTROL_PATH_LUA
+	lua_getglobal(luaState, func);
+
+	// push source on the stack
+	count=1;
+	lua_pushinteger(luaState, source);
+
+	// push argsJ on the stack
+	if (!argsJ) {
+		lua_pushnil(luaState);
+		count++;
+	} else {
+		count+= LuaPushArgument (argsJ);
+	}
+
+	// push queryJ on the stack
+	if (!queryJ) {
+		lua_pushnil(luaState);
+		count++;
+	} else {
+		count+= LuaPushArgument (queryJ);
+	}
+
+	// effectively exec LUA script code
+	err=lua_pcall(luaState, count, 1, 0);
+	if (err)  {
+		AFB_ERROR("LuaCallFunc Fail calling %s error=%s", func, lua_tostring(luaState,-1));
+		goto OnErrorExit;
+	}
+
+	// return LUA script value
+	int rc= (int)lua_tointeger(luaState, -1);
+	return rc;
+
+  OnErrorExit:
+	return -1;
+}
+
+
+// Execute LUA code from received API request
+static void LuaDoAction (LuaDoActionT action, afb_req request) {
+
+	int err, count=0;
+
+	json_object* queryJ = afb_req_json(request);
+
+	switch (action) {
+
+		case LUA_DOSTRING: {
+			const char *script = json_object_get_string(queryJ);
+			err=luaL_loadstring(luaState, script);
+			if (err) {
+				AFB_ERROR ("LUA-DO-COMPILE:FAIL String=%s err=%s", script, lua_tostring(luaState,-1) );
+				goto OnErrorExit;
+			}
+			// Push AFB client context on the stack
+			LuaAfbContextT *afbContext= LuaCtxPush(luaState, request,NULL,script);
+			if (!afbContext) goto OnErrorExit;
+
+			break;
+		}
+
+		case LUA_DOCALL: {
+			const char *func;
+			json_object *argsJ=NULL;
+
+			err= wrap_json_unpack (queryJ, "{s:s, s?o !}", "target", &func, "args", &argsJ);
+			if (err) {
+				AFB_ERROR ("LUA-DOCALL-SYNTAX missing target|args query=%s", json_object_get_string(queryJ));
+				goto OnErrorExit;
+			}
+
+			// load function (should exist in CONTROL_PATH_LUA
+			lua_getglobal(luaState, func);
+
+			// Push AFB client context on the stack
+			LuaAfbContextT *afbContext= LuaCtxPush(luaState, request, NULL, func);
+			if (!afbContext) goto OnErrorExit;
+
+			// push query on the stack
+			if (!argsJ) {
+				lua_pushnil(luaState);
+				count++;
+			} else {
+				count+= LuaPushArgument (argsJ);
+			}
+
+			break;
+		}
+
+		case LUA_DOSCRIPT: {   // Fulup need to fix argument passing
+			char *filename; char*fullpath;
+			char luaScriptPath[CONTROL_MAXPATH_LEN];
+			int index;
+			BPaths BindingPaths = GetBindingDirsPath();
+
+			// scan luascript search path once
+			static json_object *luaScriptPathJ =NULL;
+
+			// extract value from query
+			const char *target=NULL,*func=NULL;
+			json_object *argsJ=NULL;
+			err= wrap_json_unpack (queryJ, "{s:s,s?s,s?s,s?o !}","target", &target,"path",&luaScriptPathJ,"function",&func,"args",&argsJ);
+			if (err) {
+				AFB_ERROR ("LUA-DOSCRIPT-SYNTAX:missing target|[path]|[function]|[args] query=%s", json_object_get_string(queryJ));
+				goto OnErrorExit;
+			}
+
+			// search for filename=script in CONTROL_LUA_PATH
+			if (!luaScriptPathJ)  {
+				strncpy(luaScriptPath,CONTROL_DOSCRIPT_PRE, sizeof(luaScriptPath));
+				strncat(luaScriptPath,"-", sizeof(luaScriptPath)-strlen(luaScriptPath)-1);
+				strncat(luaScriptPath,target, sizeof(luaScriptPath)-strlen(luaScriptPath)-1);
+				luaScriptPathJ= ScanForConfig(BindingPaths.etcdir, CTL_SCAN_RECURSIVE,luaScriptPath,".lua");
+			}
+			for (index=0; index < json_object_array_length(luaScriptPathJ); index++) {
+				json_object *entryJ=json_object_array_get_idx(luaScriptPathJ, index);
+
+				err= wrap_json_unpack (entryJ, "{s:s, s:s !}", "fullpath",  &fullpath,"filename", &filename);
+				if (err) {
+					AFB_ERROR ("LUA-DOSCRIPT-SCAN:HOOPs invalid config file path = %s", json_object_get_string(entryJ));
+					goto OnErrorExit;
+				}
+
+				if (index > 0) AFB_WARNING("LUA-DOSCRIPT-SCAN:Ignore second script=%s path=%s", filename, fullpath);
+				else {
+					strncpy (luaScriptPath, fullpath, sizeof(luaScriptPath));
+					strncat (luaScriptPath, "/", sizeof(luaScriptPath)-strlen(luaScriptPath)-1);
+					strncat (luaScriptPath, filename, sizeof(luaScriptPath)-strlen(luaScriptPath)-1);
+				}
+			}
+
+			err= luaL_loadfile(luaState, luaScriptPath);
+			if (err) {
+				AFB_ERROR ("LUA-DOSCRIPT HOOPs Error in LUA loading scripts=%s err=%s", luaScriptPath, lua_tostring(luaState,-1));
+				goto OnErrorExit;
+			}
+
+			// script was loaded we need to parse to make it executable
+			err=lua_pcall(luaState, 0, 0, 0);
+			if (err) {
+				AFB_ERROR ("LUA-DOSCRIPT:FAIL to load %s", luaScriptPath);
+				goto OnErrorExit;
+			}
+
+			// if no func name given try to deduct from filename
+			if (!func && (func=(char*)GetMidleName(filename))!=NULL) {
+				strncpy(luaScriptPath,"_", sizeof(luaScriptPath));
+				strncat(luaScriptPath,func, sizeof(luaScriptPath)-strlen(luaScriptPath)-1);
+				func=luaScriptPath;
+			}
+			if (!func) {
+				AFB_ERROR ("LUA-DOSCRIPT:FAIL to deduct funcname from %s", filename);
+				goto OnErrorExit;
+			}
+
+			// load function (should exist in CONTROL_PATH_LUA
+			lua_getglobal(luaState, func);
+
+			// Push AFB client context on the stack
+			LuaAfbContextT *afbContext= LuaCtxPush(luaState, request, NULL, func);
+			if (!afbContext) goto OnErrorExit;
+
+			// push function arguments
+			if (!argsJ) {
+				lua_pushnil(luaState);
+				count++;
+			} else {
+				count+= LuaPushArgument(argsJ);
+			}
+
+			break;
+		}
+
+		default:
+			AFB_ERROR ("LUA-DOSCRIPT-ACTION unknown query=%s", json_object_get_string(queryJ));
+			goto OnErrorExit;
+	}
+
+	// effectively exec LUA code (afb_reply/fail done later from callback)
+	err=lua_pcall(luaState, count+1, 0, 0);
+	if (err) {
+		AFB_ERROR ("LUA-DO-EXEC:FAIL query=%s err=%s", json_object_get_string(queryJ), lua_tostring(luaState,-1));
+		goto OnErrorExit;
+	}
+	return;
+
+ OnErrorExit:
+	afb_req_fail(request,"LUA:ERROR", lua_tostring(luaState,-1));
+	return;
+}
+
+void ctlapi_execlua (afb_req request) {
+	LuaDoAction (LUA_DOSTRING, request);
+}
+
+void ctlapi_request (afb_req request) {
+	LuaDoAction (LUA_DOCALL, request);
+}
+
+void ctlapi_debuglua (afb_req request) {
+	LuaDoAction (LUA_DOSCRIPT, request);
+}
+
+static int LuaTimerClear (lua_State* luaState) {
+
+	// Get Timer Handle
+	LuaAfbContextT *afbContext= LuaCtxCheck(luaState, LUA_FIST_ARG);
+	if (!afbContext) goto OnErrorExit;
+
+	// retrieve useful information opaque handle
+	TimerHandleT *timerHandle = (TimerHandleT*)afbContext->handle;
+
+	AFB_NOTICE ("LuaTimerClear timer=%s", timerHandle->label);
+	TimerEvtStop(timerHandle);
+
+	return 0; //happy end
+
+OnErrorExit:
+	return 1;
+}
+static int LuaTimerGet (lua_State* luaState) {
+
+	// Get Timer Handle
+	LuaAfbContextT *afbContext= LuaCtxCheck(luaState, LUA_FIST_ARG);
+	if (!afbContext) goto OnErrorExit;
+
+	// retrieve useful information opaque handle
+	TimerHandleT *timerHandle = (TimerHandleT*)afbContext->handle;
+
+	// create response as a JSON object
+	json_object *responseJ= json_object_new_object();
+	json_object_object_add(responseJ,"label", json_object_new_string(timerHandle->label));
+	json_object_object_add(responseJ,"delay", json_object_new_int(timerHandle->delay));
+	json_object_object_add(responseJ,"count", json_object_new_int(timerHandle->count));
+
+	// return JSON object as Lua table
+	int count=LuaPushArgument(responseJ);
+
+	// free json object
+	json_object_put(responseJ);
+
+	return count; // return argument
+
+OnErrorExit:
+	return 0;
+}
+
+// Timer Callback
+
+// Set timer
+static int LuaTimerSetCB (void *handle) {
+	LuaCallServiceT *contextCB =(LuaCallServiceT*) handle;
+	TimerHandleT *timerHandle = (TimerHandleT*) contextCB->handle;
+	int count;
+
+	// push timer handle and user context on Lua stack
+	lua_getglobal(luaState, contextCB->callback);
+
+	// Push timer handle
+	LuaAfbContextT *afbContext= LuaCtxPush(luaState, NULL_AFBREQ, contextCB->handle, timerHandle->label);
+	if (!afbContext) goto OnErrorExit;
+	count=1;
+
+	// Push user Context
+	count+= LuaPushArgument(contextCB->context);
+
+	int err=lua_pcall(luaState, count, LUA_MULTRET, 0);
+	if (err) {
+		AFB_ERROR ("LUA-TIMER-CB:FAIL response=%s err=%s", json_object_get_string(contextCB->context), lua_tostring(luaState,-1));
+		goto OnErrorExit;
+	}
+
+	// get return parameter
+	if (!lua_isboolean(luaState, -1)) {
+		return (lua_toboolean(luaState, -1));
+	}
+
+	// timer last run free context resource
+	if (timerHandle->count == 1) {
+		LuaCtxFree(afbContext);
+	}
+	return 0;  // By default we are happy
+
+ OnErrorExit:
+	return 1;  // stop timer
+}
+
+static int LuaTimerSet(lua_State* luaState) {
+	const char *label=NULL, *info=NULL;
+	int delay=0, count=0;
+
+	json_object *timerJ = LuaPopOneArg(luaState, LUA_FIST_ARG);
+	const char *callback = lua_tostring(luaState, LUA_FIST_ARG + 1);
+	json_object *contextJ = LuaPopOneArg(luaState, LUA_FIST_ARG + 2);
+
+	if (lua_gettop(luaState) != LUA_FIST_ARG+2 || !timerJ || !callback || !contextJ) {
+		lua_pushliteral(luaState, "LuaTimerSet-Syntax timerset (timerT, 'callback', contextT)");
+		goto OnErrorExit;
+	}
+
+	int err = wrap_json_unpack(timerJ, "{ss, s?s si, si !}", "label", &label, "info", &info, "delay", &delay, "count", &count);
+	if (err) {
+		lua_pushliteral(luaState, "LuaTimerSet-Syntax timerT={label:xxx delay:ms, count:xx}");
+		goto OnErrorExit;
+	}
+
+	// everything look fine create timer structure
+	TimerHandleT *timerHandle = malloc (sizeof (TimerHandleT));
+	timerHandle->delay=delay;
+	timerHandle->count=count;
+	timerHandle->label=label;
+
+	// Allocate handle to store context and callback
+	LuaCallServiceT *contextCB = calloc (1, sizeof(LuaCallServiceT));
+	contextCB->callback= callback;
+	contextCB->context = contextJ;
+	contextCB->handle  = timerHandle;
+
+	// fire timer
+	TimerEvtStart (timerHandle, LuaTimerSetCB, contextCB);
+
+	return 0;  // Happy No Return Function
+
+OnErrorExit:
+	lua_error(luaState);
+	return 1; // return error code
+}
+
+// Register a new L2c list of LUA user plugin commands
+void LuaL2cNewLib(const char *label, luaL_Reg *l2cFunc, int count) {
+	// luaL_newlib(luaState, l2cFunc); macro does not work with pointer :(
+	luaL_checkversion(luaState);
+	lua_createtable(luaState, 0, count+1);
+	luaL_setfuncs(luaState,l2cFunc,0);
+	lua_setglobal(luaState, label);
+}
+
+static const luaL_Reg afbFunction[] = {
+	{"timerclear", LuaTimerClear},
+	{"timerget"  , LuaTimerGet},
+	{"timerset"  , LuaTimerSet},
+	{"notice"	, LuaPrintNotice},
+	{"info"	, LuaPrintInfo},
+	{"warning"   , LuaPrintWarning},
+	{"debug"	, LuaPrintDebug},
+	{"error"	, LuaPrintError},
+	{"servsync"  , LuaAfbServiceSync},
+	{"service"   , LuaAfbService},
+	{"success"   , LuaAfbSuccess},
+	{"fail"	, LuaAfbFail},
+	{"subscribe" , LuaAfbEventSubscribe},
+	{"evtmake"   , LuaAfbEventMake},
+	{"evtpush"   , LuaAfbEventPush},
+
+	{NULL, NULL}  /* sentinel */
+};
+
+// Create Binding Event at Init
+int LuaLibInit () {
+	int err, index;
+
+	// search for default policy config file
+	char fullprefix[CONTROL_MAXPATH_LEN];
+	strncpy (fullprefix, CONTROL_CONFIG_PRE "-", sizeof(fullprefix));
+	strncat (fullprefix, GetBinderName(), sizeof(fullprefix)-strlen(fullprefix)-1);
+	strncat (fullprefix, "-", sizeof(fullprefix)-strlen(fullprefix)-1);
+
+	const char *dirList= getenv("CONTROL_LUA_PATH");
+	if (!dirList) dirList= GetBindingDirsPath().etcdir;
+
+	json_object *luaScriptPathJ = ScanForConfig(dirList , CTL_SCAN_RECURSIVE, fullprefix, "lua");
+
+	// open a new LUA interpretor
+	luaState = luaL_newstate();
+	if (!luaState)  {
+		AFB_ERROR ("LUA_INIT: Fail to open lua interpretor");
+		goto OnErrorExit;
+	}
+
+	// load auxiliary libraries
+	luaL_openlibs(luaState);
+
+	// redirect print to AFB_NOTICE
+	luaL_newlib(luaState, afbFunction);
+	lua_setglobal(luaState, "AFB");
+
+	// create default lua event to send test pause/resume
+	luaDefaultEvt=calloc(1,sizeof(LuaAfbEvent));
+	luaDefaultEvt->name=CONTROL_LUA_EVENT;
+	luaDefaultEvt->event = afb_daemon_make_event(CONTROL_LUA_EVENT);
+	if (!afb_event_is_valid(luaDefaultEvt->event)) {
+		AFB_ERROR ("POLCTL_INIT: Cannot register lua-events=%s ", CONTROL_LUA_EVENT);
+		goto OnErrorExit;;
+	}
+
+	// load+exec any file found in LUA search path
+	for (index=0; index < json_object_array_length(luaScriptPathJ); index++) {
+		json_object *entryJ=json_object_array_get_idx(luaScriptPathJ, index);
+
+		char *filename; char*fullpath;
+		err= wrap_json_unpack (entryJ, "{s:s, s:s !}", "fullpath",  &fullpath,"filename", &filename);
+		if (err) {
+			AFB_ERROR ("LUA-INIT HOOPs invalid config file path = %s", json_object_get_string(entryJ));
+			goto OnErrorExit;
+		}
+
+		char filepath[CONTROL_MAXPATH_LEN];
+		strncpy(filepath, fullpath, sizeof(filepath));
+		strncat(filepath, "/", sizeof(filepath)-strlen(filepath)-1);
+		strncat(filepath, filename, sizeof(filepath)-strlen(filepath)-1);
+		err= luaL_loadfile(luaState, filepath);
+		if (err) {
+			AFB_ERROR ("LUA-LOAD HOOPs Error in LUA loading scripts=%s err=%s", filepath, lua_tostring(luaState,-1));
+			goto OnErrorExit;
+		}
+
+		// exec/compil script
+		err = lua_pcall(luaState, 0, 0, 0);
+		if (err) {
+			AFB_ERROR ("LUA-LOAD HOOPs Error in LUA exec scripts=%s err=%s", filepath, lua_tostring(luaState,-1));
+			goto OnErrorExit;
+		}
+	}
+
+	// no policy config found remove control API from binder
+	if (index == 0)  {
+		AFB_WARNING ("POLICY-INIT:WARNING (setenv CONTROL_LUA_PATH) No LUA '%s*.lua' in '%s'", fullprefix, dirList);
+	}
+
+	AFB_DEBUG ("Audio control-LUA Init Done");
+	return 0;
+
+ OnErrorExit:
+	return 1;
+}