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/*
* Copyright (C) 2015 "IoT.bzh"
* Author "Fulup Ar Foll"
*
* 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
#include <stdio.h>
#include <json.h>
#include "afb-plugin.h"
#include "afb-req-itf.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;
// Plugin handle should not be in stack (malloc or static)
static MyPluginHandleT global_handle;
// 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 void myCreate (struct afb_req request)
{
MyClientContextT *ctx = malloc (sizeof (MyClientContextT));
MyPluginHandleT *handle = (MyPluginHandleT*) &global_handle;
// store something in our plugin private client context
ctx->count = 0;
ctx->abcd = "SomeThingUseful";
*request.context = ctx;
afb_req_success_f(request, NULL, "SUCCESS: create client context for plugin [%s]", handle->anythingYouWant);
}
// 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 void myAction (struct afb_req request)
{
MyPluginHandleT *handle = (MyPluginHandleT*) &global_handle;
MyClientContextT *ctx = (MyClientContextT*) *request.context;
// store something in our plugin private client context
ctx->count++;
afb_req_success_f(request, NULL, "SUCCESS: plugin [%s] Check=[%d]\n", handle->anythingYouWant, ctx->count);
}
// 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 void myClose (struct afb_req request)
{
MyPluginHandleT *handle = (MyPluginHandleT*) &global_handle;
MyClientContextT *ctx = (MyClientContextT*) *request.context;
// store something in our plugin private client context
ctx->count++;
afb_req_success_f(request, NULL, "SUCCESS: plugin [%s] Close=[%d]\n", handle->anythingYouWant, ctx->count);
}
static void freeCtxCB (MyClientContextT *ctx) {
MyPluginHandleT *handle = (MyPluginHandleT*) &global_handle;
fprintf (stderr, "FreeCtxCB Plugin=[%s] count=[%d]", (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 const struct AFB_restapi pluginApis[]= {
{"create", AFB_SESSION_CREATE, myCreate , "Create a new session"},
{"action", AFB_SESSION_CHECK , myAction , "Use Session Context"},
{"close" , AFB_SESSION_CLOSE , myClose , "Free Context"},
{NULL}
};
static const struct AFB_plugin plugin_desc = {
.type = AFB_PLUGIN_JSON,
.info = "Sample of Client Context Usage",
.prefix = "context",
.apis = pluginApis,
.freeCtxCB = (void*)freeCtxCB
};
const struct AFB_plugin *pluginRegister (const struct AFB_interface *itf)
{
global_handle.anythingYouWant = "anythingYouWant";
return &plugin_desc;
}
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