agl-service-can-low-level - Low level CAN service made to decode and write on CAN bus.

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/* * Copyright (C) 2015, 2016, 2017 "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 <string.h> #include <pthread.h> #include <json-c/json.h> #define AFB_BINDING_VERSION 2 #include <afb/afb-binding.h> static pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER; struct event { struct event *next; struct afb_event event; char tag[1]; }; static struct event *events = 0; /* searchs the event of tag */ static struct event *event_get(const char *tag) { struct event *e = events; while(e && strcmp(e->tag, tag)) e = e->next; return e; } /* deletes the event of tag */ static int event_del(const char *tag) { struct event *e, **p; /* check exists */ e = event_get(tag); if (!e) return -1; /* unlink */ p = &events; while(*p != e) p = &(*p)->next; *p = e->next; /* destroys */ afb_event_drop(e->event); free(e); return 0; } /* creates the event of tag */ static int event_add(const char *tag, const char *name) { struct event *e; /* check valid tag */ e = event_get(tag); if (e) return -1; /* creation */ e = malloc(strlen(tag) + sizeof *e); if (!e) return -1; strcpy(e->tag, tag); /* make the event */ e->event = afb_daemon_make_event(name); if (!e->event.closure) { free(e); return -1; } /* link */ e->next = events; events = e; return 0; } static int event_subscribe(afb_req request, const char *tag) { struct event *e; e = event_get(tag); return e ? afb_req_subscribe(request, e->event) : -1; } static int event_unsubscribe(afb_req request, const char *tag) { struct event *e; e = event_get(tag); return e ? afb_req_unsubscribe(request, e->event) : -1; } static int event_push(struct json_object *args, const char *tag) { struct event *e; e = event_get(tag); return e ? afb_event_push(e->event, json_object_get(args)) : -1; } static int event_broadcast(struct json_object *args, const char *tag) { struct event *e; e = event_get(tag); return e ? afb_event_broadcast(e->event, json_object_get(args)) : -1; } // Sample Generic Ping Debug API static void ping(afb_req request, json_object *jresp, const char *tag) { static int pingcount = 0; json_object *query = afb_req_json(request); afb_req_success_f(request, jresp, "Ping Binder Daemon tag=%s count=%d query=%s", tag, ++pingcount, json_object_to_json_string(query)); } static void pingSample (afb_req request) { ping(request, json_object_new_string ("Some String"), "pingSample"); } static void pingFail (afb_req request) { afb_req_fail(request, "failed", "Ping Binder Daemon fails"); } static void pingNull (afb_req request) { ping(request, NULL, "pingNull"); } static void pingBug (afb_req request) { ping((afb_req){NULL,NULL}, NULL, "pingBug"); } static void pingEvent(afb_req request) { json_object *query = afb_req_json(request); afb_daemon_broadcast_event("event", json_object_get(query)); ping(request, json_object_get(query), "event"); } // For samples https://linuxprograms.wordpress.com/2010/05/20/json-c-libjson-tutorial/ static void pingJson (afb_req request) { json_object *jresp, *embed; jresp = json_object_new_object(); json_object_object_add(jresp, "myString", json_object_new_string ("Some String")); json_object_object_add(jresp, "myInt", json_object_new_int (1234)); embed = json_object_new_object(); json_object_object_add(embed, "subObjString", json_object_new_string ("Some String")); json_object_object_add(embed, "subObjInt", json_object_new_int (5678)); json_object_object_add(jresp,"eobj", embed); ping(request, jresp, "pingJson"); } static void subcallcb (void *prequest, int iserror, json_object *object) { afb_req request = afb_req_unstore(prequest); if (iserror) afb_req_fail(request, "failed", json_object_to_json_string(object)); else afb_req_success(request, json_object_get(object), NULL); afb_req_unref(request); } static void subcall (afb_req request) { const char *api = afb_req_value(request, "api"); const char *verb = afb_req_value(request, "verb"); const char *args = afb_req_value(request, "args"); json_object *object = api && verb && args ? json_tokener_parse(args) : NULL; if (object == NULL) afb_req_fail(request, "failed", "bad arguments"); else afb_req_subcall(request, api, verb, object, subcallcb, afb_req_store(request)); } static void subcallsync (afb_req request) { int rc; const char *api = afb_req_value(request, "api"); const char *verb = afb_req_value(request, "verb"); const char *args = afb_req_value(request, "args"); json_object *result, *object = api && verb && args ? json_tokener_parse(args) : NULL; if (object == NULL) afb_req_fail(request, "failed", "bad arguments"); else { rc = afb_req_subcall_sync(request, api, verb, object, &result); if (rc) afb_req_success(request, result, NULL); else { afb_req_fail(request, "failed", json_object_to_json_string(result)); json_object_put(result); } } } static void eventadd (afb_req request) { const char *tag = afb_req_value(request, "tag"); const char *name = afb_req_value(request, "name"); pthread_mutex_lock(&mutex); if (tag == NULL || name == NULL) afb_req_fail(request, "failed", "bad arguments"); else if (0 != event_add(tag, name)) afb_req_fail(request, "failed", "creation error"); else afb_req_success(request, NULL, NULL); pthread_mutex_unlock(&mutex); } static void eventdel (afb_req request) { const char *tag = afb_req_value(request, "tag"); pthread_mutex_lock(&mutex); if (tag == NULL) afb_req_fail(request, "failed", "bad arguments"); else if (0 != event_del(tag)) afb_req_fail(request, "failed", "deletion error"); else afb_req_success(request, NULL, NULL); pthread_mutex_unlock(&mutex); } static void eventsub (afb_req request) { const char *tag = afb_req_value(request, "tag"); pthread_mutex_lock(&mutex); if (tag == NULL) afb_req_fail(request, "failed", "bad arguments"); else if (0 != event_subscribe(request, tag)) afb_req_fail(request, "failed", "subscription error"); else afb_req_success(request, NULL, NULL); pthread_mutex_unlock(&mutex); } static void eventunsub (afb_req request) { const char *tag = afb_req_value(request, "tag"); pthread_mutex_lock(&mutex); if (tag == NULL) afb_req_fail(request, "failed", "bad arguments"); else if (0 != event_unsubscribe(request, tag)) afb_req_fail(request, "failed", "unsubscription error"); else afb_req_success(request, NULL, NULL); pthread_mutex_unlock(&mutex); } static void eventpush (afb_req request) { const char *tag = afb_req_value(request, "tag"); const char *data = afb_req_value(request, "data"); json_object *object = data ? json_tokener_parse(data) : NULL; pthread_mutex_lock(&mutex); if (tag == NULL) afb_req_fail(request, "failed", "bad arguments"); else if (0 > event_push(object, tag)) afb_req_fail(request, "failed", "push error"); else afb_req_success(request, NULL, NULL); pthread_mutex_unlock(&mutex); json_object_put(object); } static void callcb (void *prequest, int iserror, json_object *object) { afb_req request = afb_req_unstore(prequest); if (iserror) afb_req_fail(request, "failed", json_object_to_json_string(object)); else afb_req_success(request, json_object_get(object), NULL); afb_req_unref(request); } static void call (afb_req request) { const char *api = afb_req_value(request, "api"); const char *verb = afb_req_value(request, "verb"); const char *args = afb_req_value(request, "args"); json_object *object = api && verb && args ? json_tokener_parse(args) : NULL; if (object == NULL) afb_req_fail(request, "failed", "bad arguments"); else afb_service_call(api, verb, object, callcb, afb_req_store(request)); } static void callsync (afb_req request) { int rc; const char *api = afb_req_value(request, "api"); const char *verb = afb_req_value(request, "verb"); const char *args = afb_req_value(request, "args"); json_object *result, *object = api && verb && args ? json_tokener_parse(args) : NULL; if (object == NULL) afb_req_fail(request, "failed", "bad arguments"); else { rc = afb_service_call_sync(api, verb, object, &result); if (rc) afb_req_success(request, result, NULL); else { afb_req_fail(request, "failed", json_object_to_json_string(result)); json_object_put(result); } } } static void verbose (afb_req request) { int level = 5; json_object *query = afb_req_json(request), *l; if (json_object_is_type(query,json_type_int)) level = json_object_get_int(query); else if (json_object_object_get_ex(query, "level", &l) && json_object_is_type(l, json_type_int)) level = json_object_get_int(l); if (!json_object_object_get_ex(query,"message",&l)) l = query; AFB_REQ_VERBOSE(request, level, "verbose called for %s", json_object_get_string(l)); afb_req_success(request, NULL, NULL); } static void exitnow (afb_req request) { int code = 0; json_object *query = afb_req_json(request), *l; if (json_object_is_type(query,json_type_int)) code = json_object_get_int(query); else if (json_object_object_get_ex(query, "code", &l) && json_object_is_type(l, json_type_int)) code = json_object_get_int(l); if (!json_object_object_get_ex(query,"reason",&l)) l = NULL; REQ_NOTICE(request, "in phase of exiting with code %d, reason: %s", code, l ? json_object_get_string(l) : "unknown"); afb_req_success(request, NULL, NULL); exit(code); } static void broadcast(afb_req request) { const char *tag = afb_req_value(request, "tag"); const char *name = afb_req_value(request, "name"); const char *data = afb_req_value(request, "data"); json_object *object = data ? json_tokener_parse(data) : NULL; if (tag != NULL) { pthread_mutex_lock(&mutex); if (0 > event_broadcast(object, tag)) afb_req_fail(request, "failed", "broadcast error"); else afb_req_success(request, NULL, NULL); pthread_mutex_unlock(&mutex); } else if (name != NULL) { if (0 > afb_daemon_broadcast_event(name, object)) afb_req_fail(request, "failed", "broadcast error"); else afb_req_success(request, NULL, NULL); } else { afb_req_fail(request, "failed", "bad arguments"); } json_object_put(object); } static int preinit() { NOTICE("hello binding comes to live"); return 0; } static int init() { NOTICE("hello binding starting"); return 0; } static void onevent(const char *event, struct json_object *object) { NOTICE("received event %s(%s)", event, json_object_to_json_string(object)); } // 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 afb_verb_v2 verbs[]= { { "ping" , pingSample , NULL, AFB_SESSION_NONE }, { "pingfail" , pingFail , NULL, AFB_SESSION_NONE }, { "pingnull" , pingNull , NULL, AFB_SESSION_NONE }, { "pingbug" , pingBug , NULL, AFB_SESSION_NONE }, { "pingJson" , pingJson , NULL, AFB_SESSION_NONE }, { "pingevent", pingEvent , NULL, AFB_SESSION_NONE }, { "subcall", subcall , NULL, AFB_SESSION_NONE }, { "subcallsync", subcallsync, NULL, AFB_SESSION_NONE }, { "eventadd", eventadd , NULL, AFB_SESSION_NONE }, { "eventdel", eventdel , NULL, AFB_SESSION_NONE }, { "eventsub", eventsub , NULL, AFB_SESSION_NONE }, { "eventunsub", eventunsub , NULL, AFB_SESSION_NONE }, { "eventpush", eventpush , NULL, AFB_SESSION_NONE }, { "call", call , NULL, AFB_SESSION_NONE }, { "callsync", callsync , NULL, AFB_SESSION_NONE }, { "verbose", verbose , NULL, AFB_SESSION_NONE }, { "broadcast", broadcast , NULL, AFB_SESSION_NONE }, { "exit", exitnow , NULL, AFB_SESSION_NONE }, { NULL} }; const afb_binding_v2 afbBindingV2 = { .api = "hello", .specification = NULL, .verbs = verbs, .preinit = preinit, .init = init, .onevent = onevent };


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