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diff --git a/include/afb/afb-req-x2-itf.h b/include/afb/afb-req-x2-itf.h
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+/*
+ * Copyright (C) 2016, 2017, 2018 "IoT.bzh"
+ * Author: José Bollo <jose.bollo@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.
+ */
+
+#pragma once
+
+/* defined here */
+struct afb_req_x2;
+struct afb_req_x2_itf;
+
+/* referenced here */
+#include "afb-arg.h"
+struct afb_req_x1;
+struct afb_event_x1;
+struct afb_event_x2;
+struct afb_api_x3;
+struct afb_stored_req;
+
+/**
+ * structure for the request
+ */
+struct afb_req_x2
+{
+ /**
+ * interface for the request
+ */
+ const struct afb_req_x2_itf *itf;
+
+ /**
+ * current api (if any)
+ */
+ struct afb_api_x3 *api;
+
+ /**
+ * closure associated with the callback processing the verb of the request
+ * as given at its declaration
+ */
+ void *vcbdata;
+
+ /**
+ * the name of the called api
+ */
+ const char *called_api;
+
+ /**
+ * the name of the called verb
+ */
+ const char *called_verb;
+};
+
+/**
+ * subcall modes
+ *
+ * When making subcalls, it is now possible to explicitely set the subcall
+ * mode to a combination of the following mode using binary OR.
+ *
+ * In particular, the following combination of modes are to be known:
+ *
+ * - for **subcall** having a similar behaviour to the subcalls of bindings
+ * version 1 and 2: afb_req_x2_subcall_pass_events|afb_req_x2_subcall_on_behalf
+ * - for **subcall** having the behaviour of the **call**:
+ * afb_req_x2_subcall_catch_events|afb_req_x2_subcall_api_session
+ *
+ * Be aware that if none of mode afb_req_x2_subcall_catch_events or
+ * afb_req_x2_subcall_pass_events is set, subscrption to events will be ignored.
+ */
+enum afb_req_x2_subcall_flags
+{
+ /**
+ * the calling API wants to receive the events from subscription
+ */
+ afb_req_x2_subcall_catch_events = 1,
+
+ /**
+ * the original request will receive the events from subscription
+ */
+ afb_req_x2_subcall_pass_events = 2,
+
+ /**
+ * the calling API wants to use the credentials of the original request
+ */
+ afb_req_x2_subcall_on_behalf = 4,
+
+ /**
+ * the calling API wants to use its session instead of the one of the
+ * original request
+ */
+ afb_req_x2_subcall_api_session = 8,
+};
+
+/**
+ * Interface for handling requests.
+ *
+ * It records the functions to be called for the request.
+ * Don't use this structure directly, Use the helper functions instead.
+ */
+struct afb_req_x2_itf
+{
+ /* CAUTION: respect the order, add at the end */
+
+ /** get the json */
+ struct json_object *(*json)(
+ struct afb_req_x2 *req);
+
+ /** get an argument */
+ struct afb_arg (*get)(
+ struct afb_req_x2 *req,
+ const char *name);
+
+ /** reply a success @deprecated use @ref reply */
+ void (*legacy_success)(
+ struct afb_req_x2 *req,
+ struct json_object *obj,
+ const char *info);
+
+ /** reply a failure @deprecated use @ref reply */
+ void (*legacy_fail)(
+ struct afb_req_x2 *req,
+ const char *status,
+ const char *info);
+
+ /** reply a success @deprecated use @ref vreply */
+ void (*legacy_vsuccess)(
+ struct afb_req_x2 *req,
+ struct json_object *obj,
+ const char *fmt,
+ va_list args);
+
+ /** reply a failure @deprecated use @ref vreply */
+ void (*legacy_vfail)(
+ struct afb_req_x2 *req,
+ const char *status,
+ const char *fmt,
+ va_list args);
+
+ /** get a client context @deprecated use @ref context_make */
+ void *(*legacy_context_get)(
+ struct afb_req_x2 *req);
+
+ /** set a client context @deprecated use @ref context_make */
+ void (*legacy_context_set)(
+ struct afb_req_x2 *req,
+ void *value,
+ void (*free_value)(void*));
+
+ /** increase reference count of the request */
+ struct afb_req_x2 *(*addref)(
+ struct afb_req_x2 *req);
+
+ /** decrease reference count of the request */
+ void (*unref)(
+ struct afb_req_x2 *req);
+
+ /** close the client session related to the api of the request */
+ void (*session_close)(
+ struct afb_req_x2 *req);
+
+ /** set the levele of assurancy related to the api of the request */
+ int (*session_set_LOA)(
+ struct afb_req_x2 *req,
+ unsigned level);
+
+ /** make subscription of the client of the request to the event @deprecated use @ref subscribe_event_x2 */
+ int (*legacy_subscribe_event_x1)(
+ struct afb_req_x2 *req,
+ struct afb_event_x1 event);
+
+ /** remove subscription of the client of the request to the event @deprecated use @ref unsubscribe_event_x2 */
+ int (*legacy_unsubscribe_event_x1)(
+ struct afb_req_x2 *req,
+ struct afb_event_x1 event);
+
+ /** asynchronous subcall @deprecated use @ref subcall */
+ void (*legacy_subcall)(
+ struct afb_req_x2 *req,
+ const char *api,
+ const char *verb,
+ struct json_object *args,
+ void (*callback)(void*, int, struct json_object*),
+ void *cb_closure);
+
+ /** synchronous subcall @deprecated use @ref subcallsync */
+ int (*legacy_subcallsync)(
+ struct afb_req_x2 *req,
+ const char *api,
+ const char *verb,
+ struct json_object *args,
+ struct json_object **result);
+
+ /** log a message for the request */
+ void (*vverbose)(
+ struct afb_req_x2 *req,
+ int level,
+ const char *file,
+ int line,
+ const char * func,
+ const char *fmt,
+ va_list args);
+
+ /** store the request @deprecated no more needed */
+ struct afb_stored_req *(*legacy_store_req)(
+ struct afb_req_x2 *req);
+
+ /** asynchronous subcall with request @deprecated use @ref subcall */
+ void (*legacy_subcall_req)(
+ struct afb_req_x2 *req,
+ const char *api,
+ const char *verb,
+ struct json_object *args,
+ void (*callback)(void*, int, struct json_object*, struct afb_req_x1),
+ void *cb_closure);
+
+ /** store the request @deprecated no more needed */
+ int (*has_permission)(
+ struct afb_req_x2 *req,
+ const char *permission);
+
+ /** get the application id of the client of the request */
+ char *(*get_application_id)(
+ struct afb_req_x2 *req);
+
+ /** handle client context of the api getting the request */
+ void *(*context_make)(
+ struct afb_req_x2 *req,
+ int replace,
+ void *(*create_value)(void *creation_closure),
+ void (*free_value)(void*),
+ void *creation_closure);
+
+ /** make subscription of the client of the request to the event */
+ int (*subscribe_event_x2)(
+ struct afb_req_x2 *req,
+ struct afb_event_x2 *event);
+
+ /** remove subscription of the client of the request to the event */
+ int (*unsubscribe_event_x2)(
+ struct afb_req_x2 *req,
+ struct afb_event_x2 *event);
+
+ /** asynchronous subcall with request @deprecated use @ref subcall */
+ void (*legacy_subcall_request)(
+ struct afb_req_x2 *req,
+ const char *api,
+ const char *verb,
+ struct json_object *args,
+ void (*callback)(void*, int, struct json_object*, struct afb_req_x2 *req),
+ void *cb_closure);
+
+ /** get the user id (unix) of the client of the request */
+ int (*get_uid)(
+ struct afb_req_x2 *req);
+
+ /** reply to the request */
+ void (*reply)(
+ struct afb_req_x2 *req,
+ struct json_object *obj,
+ const char *error,
+ const char *info);
+
+ /** reply to the request with formating of info */
+ void (*vreply)(
+ struct afb_req_x2 *req,
+ struct json_object *obj,
+ const char *error,
+ const char *fmt,
+ va_list args);
+
+ /** get description of the client of the request */
+ struct json_object *(*get_client_info)(
+ struct afb_req_x2 *req);
+
+ /** asynchronous subcall */
+ void (*subcall)(
+ struct afb_req_x2 *req,
+ const char *apiname,
+ const char *verb,
+ struct json_object *args,
+ int flags,
+ void (*callback)(void *closure, struct json_object *object, const char *error, const char * info, struct afb_req_x2 *req),
+ void *closure);
+
+ /** synchronous subcall */
+ int (*subcallsync)(
+ struct afb_req_x2 *req,
+ const char *api,
+ const char *verb,
+ struct json_object *args,
+ int flags,
+ struct json_object **object,
+ char **error,
+ char **info);
+};
+