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authorForlot Romain [IoT.bzh] <claneys@iot.bzh>2017-09-04 23:37:22 +0200
committerRomain Forlot <romain.forlot@iot.bzh>2017-12-14 10:59:55 +0100
commit19bc13783a7451c81848ea132614a8df11c7740a (patch)
treeb61995b1af0914559f6de6461bda3dd76f2e724c /signal-composer-binding/ctl-lua.c
parent29168eb150eae139685c40c0bec22a5b7485cb66 (diff)
Initial commit
Change-Id: I2bb38bffdd92602659670901b8442201b7c56214 Signed-off-by: Romain Forlot <romain.forlot@iot.bzh>
Diffstat (limited to 'signal-composer-binding/ctl-lua.c')
-rw-r--r--signal-composer-binding/ctl-lua.c1071
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;
+}