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Diffstat (limited to 'include/afb/afb-binding.h')
| -rw-r--r-- | include/afb/afb-binding.h | 261 |
1 files changed, 261 insertions, 0 deletions
diff --git a/include/afb/afb-binding.h b/include/afb/afb-binding.h new file mode 100644 index 00000000..ac63d36b --- /dev/null +++ b/include/afb/afb-binding.h @@ -0,0 +1,261 @@ +/* + * Copyright (C) 2016 "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 + +#include <stdarg.h> + +/***************************************************************************** + * This files is the main file to include for writing bindings dedicated to + * + * AFB-DAEMON + * + * Functions of bindings of afb-daemon are accessible by authorized clients + * through the apis module of afb-daemon. + * + * A binding is a shared library. This shared library must have at least one + * exported symbol for being registered in afb-daemon. + * For the current version of afb-daemon, the function exported MUST be named + * + * afbBindingV1Register + */ + +/* + * Some function of the library are exported to afb-daemon. + */ + +#include <afb/afb-event-itf.h> +#include <afb/afb-req-itf.h> + +/* + * Definition of the type+versions of the binding. + * The definition uses hashes. + */ +enum afb_binding_type +{ + AFB_BINDING_VERSION_1 = 123456789 /* version 1 */ +}; + +/* + * Enum for Session/Token/Assurance middleware. + * This enumeration is valid for bindings of type 1 + */ +enum afb_session_v1 +{ + AFB_SESSION_NONE = 0, /* nothing required */ + AFB_SESSION_CREATE = 1, /* Obsolete */ + AFB_SESSION_CLOSE = 2, /* After token authentification, closes the session at end */ + AFB_SESSION_RENEW = 4, /* After token authentification, refreshes the token at end */ + AFB_SESSION_CHECK = 8, /* Requires token authentification */ + + AFB_SESSION_LOA_GE = 16, /* check that the LOA is greater or equal to the given value */ + AFB_SESSION_LOA_LE = 32, /* check that the LOA is lesser or equal to the given value */ + AFB_SESSION_LOA_EQ = 48, /* check that the LOA is equal to the given value */ + + AFB_SESSION_LOA_SHIFT = 6, /* shift for LOA */ + AFB_SESSION_LOA_MASK = 7, /* mask for LOA */ + + AFB_SESSION_LOA_0 = 0, /* value for LOA of 0 */ + AFB_SESSION_LOA_1 = 64, /* value for LOA of 1 */ + AFB_SESSION_LOA_2 = 128, /* value for LOA of 2 */ + AFB_SESSION_LOA_3 = 192, /* value for LOA of 3 */ + AFB_SESSION_LOA_4 = 256, /* value for LOA of 4 */ + + AFB_SESSION_LOA_LE_0 = AFB_SESSION_LOA_LE | AFB_SESSION_LOA_0, /* check LOA <= 0 */ + AFB_SESSION_LOA_LE_1 = AFB_SESSION_LOA_LE | AFB_SESSION_LOA_1, /* check LOA <= 1 */ + AFB_SESSION_LOA_LE_2 = AFB_SESSION_LOA_LE | AFB_SESSION_LOA_2, /* check LOA <= 2 */ + AFB_SESSION_LOA_LE_3 = AFB_SESSION_LOA_LE | AFB_SESSION_LOA_3, /* check LOA <= 3 */ + + AFB_SESSION_LOA_GE_0 = AFB_SESSION_LOA_GE | AFB_SESSION_LOA_0, /* check LOA >= 0 */ + AFB_SESSION_LOA_GE_1 = AFB_SESSION_LOA_GE | AFB_SESSION_LOA_1, /* check LOA >= 1 */ + AFB_SESSION_LOA_GE_2 = AFB_SESSION_LOA_GE | AFB_SESSION_LOA_2, /* check LOA >= 2 */ + AFB_SESSION_LOA_GE_3 = AFB_SESSION_LOA_GE | AFB_SESSION_LOA_3, /* check LOA >= 3 */ + + AFB_SESSION_LOA_EQ_0 = AFB_SESSION_LOA_EQ | AFB_SESSION_LOA_0, /* check LOA == 0 */ + AFB_SESSION_LOA_EQ_1 = AFB_SESSION_LOA_EQ | AFB_SESSION_LOA_1, /* check LOA == 1 */ + AFB_SESSION_LOA_EQ_2 = AFB_SESSION_LOA_EQ | AFB_SESSION_LOA_2, /* check LOA == 2 */ + AFB_SESSION_LOA_EQ_3 = AFB_SESSION_LOA_EQ | AFB_SESSION_LOA_3 /* check LOA == 3 */ +}; + +/* + * Description of one verb of the API provided by the binding + * This enumeration is valid for bindings of type 1 + */ +struct afb_verb_desc_v1 +{ + const char *name; /* name of the verb */ + enum afb_session_v1 session; /* authorisation and session requirements of the verb */ + void (*callback)(struct afb_req req); /* callback function implementing the verb */ + const char *info; /* textual description of the verb */ +}; + +/* + * Description of the bindings of type 1 + */ +struct afb_binding_desc_v1 +{ + const char *info; /* textual information about the binding */ + const char *prefix; /* required prefix name for the binding */ + const struct afb_verb_desc_v1 *verbs; /* array of descriptions of verbs terminated by a NULL name */ +}; + +/* + * Description of a binding + */ +struct afb_binding +{ + enum afb_binding_type type; /* type of the binding */ + union { + struct afb_binding_desc_v1 v1; /* description of the binding of type 1 */ + }; +}; + +/* + * config mode + */ +enum afb_mode { + AFB_MODE_LOCAL = 0, /* run locally */ + AFB_MODE_REMOTE, /* run remotely */ + AFB_MODE_GLOBAL /* run either remotely or locally (DONT USE! reserved for future) */ +}; + +/* declaration of features of libsystemd */ +struct sd_event; +struct sd_bus; + +/* + * Definition of the facilities provided by the daemon. + */ +struct afb_daemon_itf { + int (*event_broadcast)(void *closure, const char *name, struct json_object *object); /* broadcasts evant 'name' with 'object' */ + struct sd_event *(*get_event_loop)(void *closure); /* gets the common systemd's event loop */ + struct sd_bus *(*get_user_bus)(void *closure); /* gets the common systemd's user d-bus */ + struct sd_bus *(*get_system_bus)(void *closure); /* gets the common systemd's system d-bus */ + void (*vverbose)(void*closure, int level, const char *file, int line, const char *fmt, va_list args); + struct afb_event (*event_make)(void *closure, const char *name); /* creates an event of 'name' */ +}; + +/* + * Structure for accessing daemon. + * See also: afb_daemon_get_event_sender, afb_daemon_get_event_loop, afb_daemon_get_user_bus, afb_daemon_get_system_bus + */ +struct afb_daemon { + const struct afb_daemon_itf *itf; /* the interfacing functions */ + void *closure; /* the closure when calling these functions */ +}; + +/* + * Interface between the daemon and the binding. + */ +struct afb_binding_interface +{ + struct afb_daemon daemon; /* access to the daemon facilies */ + int verbosity; /* level of verbosity */ + enum afb_mode mode; /* run mode (local or remote) */ +}; + +/* + * Function for registering the binding + */ +extern const struct afb_binding *afbBindingV1Register (const struct afb_binding_interface *interface); + +/* + * Retrieves the common systemd's event loop of AFB + * 'daemon' MUST be the daemon given in interface when activating the binding. + */ +static inline struct sd_event *afb_daemon_get_event_loop(struct afb_daemon daemon) +{ + return daemon.itf->get_event_loop(daemon.closure); +} + +/* + * Retrieves the common systemd's user/session d-bus of AFB + * 'daemon' MUST be the daemon given in interface when activating the binding. + */ +static inline struct sd_bus *afb_daemon_get_user_bus(struct afb_daemon daemon) +{ + return daemon.itf->get_user_bus(daemon.closure); +} + +/* + * Retrieves the common systemd's system d-bus of AFB + * 'daemon' MUST be the daemon given in interface when activating the binding. + */ +static inline struct sd_bus *afb_daemon_get_system_bus(struct afb_daemon daemon) +{ + return daemon.itf->get_system_bus(daemon.closure); +} + +/* + * Broadcasts widely the event of 'name' with the data 'object'. + * 'object' can be NULL. + * 'daemon' MUST be the daemon given in interface when activating the binding. + * + * For conveniency, the function calls 'json_object_put' for 'object'. + * Thus, in the case where 'object' should remain available after + * the function returns, the function 'json_object_get' shall be used. + * + * Returns the count of clients that received the event. + */ +static inline int afb_daemon_broadcast_event(struct afb_daemon daemon, const char *name, struct json_object *object) +{ + return daemon.itf->event_broadcast(daemon.closure, name, object); +} + +/* + * Creates an event of 'name' and returns it. + * 'daemon' MUST be the daemon given in interface when activating the binding. + */ +static inline struct afb_event afb_daemon_make_event(struct afb_daemon daemon, const char *name) +{ + return daemon.itf->event_make(daemon.closure, name); +} + +/* + * Send a message described by 'fmt' and following parameters + * to the journal for the verbosity 'level'. + * 'file' and 'line' are indicators of position of the code in source files. + * 'daemon' MUST be the daemon given in interface when activating the binding. + */ +static inline void afb_daemon_verbose(struct afb_daemon daemon, int level, const char *file, int line, const char *fmt, ...) __attribute__((format(printf, 5, 6))); +static inline void afb_daemon_verbose(struct afb_daemon daemon, int level, const char *file, int line, const char *fmt, ...) +{ + va_list args; + va_start(args, fmt); + return daemon.itf->vverbose(daemon.closure, level, file, line, fmt, args); + va_end(args); +} + +/* + * Macros for logging messages + */ +#if !defined(NO_BINDING_VERBOSE_MACRO) +# if !defined(NO_BINDING_FILE_LINE_INDICATION) +# define ERROR(itf,...) do{if(itf->verbosity>=0)afb_daemon_verbose(itf->daemon,3,__FILE__,__LINE__,__VA_ARGS__);}while(0) +# define WARNING(itf,...) do{if(itf->verbosity>=1)afb_daemon_verbose(itf->daemon,4,__FILE__,__LINE__,__VA_ARGS__);}while(0) +# define NOTICE(itf,...) do{if(itf->verbosity>=1)afb_daemon_verbose(itf->daemon,5,__FILE__,__LINE__,__VA_ARGS__);}while(0) +# define INFO(itf,...) do{if(itf->verbosity>=2)afb_daemon_verbose(itf->daemon,6,__FILE__,__LINE__,__VA_ARGS__);}while(0) +# define DEBUG(itf,...) do{if(itf->verbosity>=3)afb_daemon_verbose(itf->daemon,7,__FILE__,__LINE__,__VA_ARGS__);}while(0) +# else +# define ERROR(itf,...) do{if(itf->verbosity>=0)afb_daemon_verbose(itf->daemon,3,NULL,0,__VA_ARGS__);}while(0) +# define WARNING(itf,...) do{if(itf->verbosity>=1)afb_daemon_verbose(itf->daemon,4,NULL,0,__VA_ARGS__);}while(0) +# define NOTICE(itf,...) do{if(itf->verbosity>=1)afb_daemon_verbose(itf->daemon,5,NULL,0,__VA_ARGS__);}while(0) +# define INFO(itf,...) do{if(itf->verbosity>=2)afb_daemon_verbose(itf->daemon,6,NULL,0,__VA_ARGS__);}while(0) +# define DEBUG(itf,...) do{if(itf->verbosity>=3)afb_daemon_verbose(itf->daemon,7,NULL,0,__VA_ARGS__);}while(0) +# endif +#endif + |