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/*
* Copyright (C) 2015 "IoT.bzh"
* Author "Fulup Ar Foll"
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "local-def.h"
typedef struct {
/*
* In case your plugin is implemented on multiple files or used share routines
* with other plugins, it might not be possible to use global static variable.
* In this case you can attach a static handle to your plugin. This handle
* is passed within each API call under request->handle
*
*/
void *anythingYouWant;
} MyPluginHandleT;
typedef struct {
/*
* client context is attached a session but private to a each plugin.
* Context is passed to each API under request->context
*
* Note:
* -client context is free when a session is closed. Developer should not
* forget that even if context is private to each plugin, session is unique
* to a client. When session close, every plugin are notified to free there
* private context.
* -by default standard "free" function from libc is used to free context.
* Developer may define it own under plugin->freeCB. This call received
* FreeCtxCb(void *ClientCtx, void*PluginHandle, char*SessionUUID) if
* FreeCtxCb=(void*)-1 then context wont be free by session manager.
* -when an API use AFB_SESSION_RESET this close the session and each plugin
* will be notified to free ressources.
*/
int count;
char *abcd;
} MyClientContextT;
// This function is call at session open time. Any client trying to
// call it with an already open session will be denied.
// Ex: http://localhost:1234/api/context/create?token=123456789
STATIC json_object* myCreate (AFB_request *request) {
json_object *jresp;
MyClientContextT *ctx= malloc (sizeof (MyClientContextT));
MyPluginHandleT *handle = (MyPluginHandleT*) request->handle;
// store something in our plugin private client context
ctx->count = 0;
ctx->abcd = "SomeThingUseful";
request->context = ctx;
jresp = jsonNewMessage(AFB_SUCCESS, "SUCCESS: create client context for plugin [%s]", handle->anythingYouWant);
return jresp;
}
// This function can only be called with a valid token. Token should be renew before
// session timeout a standard renew api is avaliable at /api/token/renew this API
// can be called automatically with <token-renew> HTML5 widget.
// ex: http://localhost:1234/api/context/action?token=xxxxxx-xxxxxx-xxxxx-xxxxx-xxxxxx
STATIC json_object* myAction (AFB_request *request) {
json_object* jresp;
MyPluginHandleT *handle = (MyPluginHandleT*) request->handle;
MyClientContextT *ctx= (MyClientContextT*) request->context;
// store something in our plugin private client context
ctx->count++;
jresp = jsonNewMessage(AFB_SUCCESS, "SUCCESS: plugin [%s] Check=[%d]\n", handle->anythingYouWant, ctx->count);
return jresp;
}
// After execution of this function, client session will be close and if they
// created a context [request->context != NULL] every plugins will be notified
// that they should free context resources.
// ex: http://localhost:1234/api/context/close?token=xxxxxx-xxxxxx-xxxxx-xxxxx-xxxxxx
STATIC json_object* myClose (AFB_request *request) {
json_object* jresp;
MyPluginHandleT *handle = (MyPluginHandleT*) request->handle;
MyClientContextT *ctx= (MyClientContextT*) request->context;
// store something in our plugin private client context
ctx->count++;
jresp = jsonNewMessage(AFB_SUCCESS, "SUCCESS: plugin [%s] Close=[%d]\n", handle->anythingYouWant, ctx->count);
// Note Context resource should be free in FreeCtxCB and not here in case session timeout.
return jresp;
}
STATIC void freeCtxCB (MyClientContextT *ctx, MyPluginHandleT *handle, char *uuid) {
fprintf (stderr, "FreeCtxCB uuid=[%s] Plugin=[%s] count=[%d]", uuid, (char*)handle->anythingYouWant, ctx->count);
free (ctx);
// Note: handle should be free it is a static resource attached to plugin and not to session
}
// NOTE: this sample does not use session to keep test a basic as possible
// in real application most APIs should be protected with AFB_SESSION_CHECK
STATIC AFB_restapi pluginApis[]= {
{"create", AFB_SESSION_CREATE, (AFB_apiCB)myCreate , "Create a new session"},
{"action", AFB_SESSION_CHECK , (AFB_apiCB)myAction , "Use Session Context"},
{"close" , AFB_SESSION_CLOSE , (AFB_apiCB)myClose , "Free Context"},
{NULL}
};
PUBLIC AFB_plugin *pluginRegister () {
// Plugin handle should not be in stack (malloc or static)
STATIC MyPluginHandleT handle;
AFB_plugin *plugin = malloc (sizeof (AFB_plugin));
plugin->type = AFB_PLUGIN_JSON;
plugin->info = "Sample of Client Context Usage";
plugin->prefix = "context";
plugin->apis = pluginApis;
plugin->handle = &handle;
plugin->freeCtxCB= (AFB_freeCtxCB) freeCtxCB;
// feed plugin handle before returning from registration
handle.anythingYouWant = "My Plugin Handle";
return (plugin);
};
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