src/afb-subcall.c

   1 /*
   2  * Copyright (C) 2016, 2017 "IoT.bzh"
   3  * Author: José Bollo <jose.bollo@iot.bzh>
   4  *
   5  * Licensed under the Apache License, Version 2.0 (the "License");
   6  * you may not use this file except in compliance with the License.
   7  * You may obtain a copy of the License at
   8  *
   9  *   http://www.apache.org/licenses/LICENSE-2.0
  10  *
  11  * Unless required by applicable law or agreed to in writing, software
  12  * distributed under the License is distributed on an "AS IS" BASIS,
  13  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  14  * See the License for the specific language governing permissions and
  15  * limitations under the License.
  16  */
  17
  18 #define _GNU_SOURCE
  19
  20 #include <stdlib.h>
  21 #include <string.h>
  22
  23 #include <json-c/json.h>
  24 #include <afb/afb-req-itf.h>
  25
  26 #include "afb-subcall.h"
  27 #include "afb-msg-json.h"
  28 #include "afb-apis.h"
  29 #include "afb-context.h"
  30 #include "afb-xreq.h"
  31 #include "verbose.h"
  32
  33 struct subcall;
  34
  35 static void subcall_destroy(void *closure);
  36 static void subcall_reply(void *closure, int iserror, struct json_object *obj);
  37 static int subcall_subscribe(void *closure, struct afb_event event);
  38 static int subcall_unsubscribe(void *closure, struct afb_event event);
  39
  40 const struct afb_xreq_query_itf afb_subcall_xreq_itf = {
  41         .reply = subcall_reply,
  42         .unref = subcall_destroy,
  43         .subscribe = subcall_subscribe,
  44         .unsubscribe = subcall_unsubscribe
  45 };
  46
  47 struct subcall
  48 {
  49         struct afb_xreq xreq;
  50         struct afb_xreq *caller;
  51         void (*callback)(void*, int, struct json_object*);
  52         void *closure;
  53 };
  54
  55 static void subcall_destroy(void *closure)
  56 {
  57         struct subcall *subcall = closure;
  58
  59         json_object_put(subcall->xreq.json);
  60         afb_xreq_unref(subcall->caller);
  61         free(subcall);
  62 }
  63
  64 static void subcall_reply(void *closure, int iserror, struct json_object *obj)
  65 {
  66         struct subcall *subcall = closure;
  67
  68         subcall->callback(subcall->closure, iserror, obj);
  69         json_object_put(obj);
  70 }
  71
  72 static int subcall_subscribe(void *closure, struct afb_event event)
  73 {
  74         struct subcall *subcall = closure;
  75
  76         return afb_xreq_subscribe(subcall->caller, event);
  77 }
  78
  79 static int subcall_unsubscribe(void *closure, struct afb_event event)
  80 {
  81         struct subcall *subcall = closure;
  82
  83         return afb_xreq_unsubscribe(subcall->caller, event);
  84 }
  85
  86 void afb_subcall_internal_error(void (*callback)(void*, int, struct json_object*), void *closure)
  87 {
  88         static struct json_object *obj;
  89
  90         if (obj == NULL)
  91                 obj = afb_msg_json_reply_error("failed", "internal error", NULL, NULL);
  92
  93         callback(closure, 1, obj);
  94 }
  95
  96 static struct subcall *create_subcall(struct afb_xreq *caller, const char *api, const char *verb, struct json_object *args, void (*callback)(void*, int, struct json_object*), void *closure)
  97 {
  98         struct subcall *subcall;
  99
 100         subcall = calloc(1, sizeof *subcall);
 101         if (subcall == NULL) {
 102                 return NULL;
 103         }
 104
 105
 106         afb_context_subinit(&subcall->xreq.context, &caller->context);
 107         subcall->xreq.refcount = 1;
 108         subcall->xreq.json = args;
 109         subcall->xreq.api = api; /* TODO: alloc ? */
 110         subcall->xreq.verb = verb; /* TODO: alloc ? */
 111         subcall->xreq.query = subcall;
 112         subcall->xreq.queryitf = &afb_subcall_xreq_itf;
 113         subcall->caller = caller;
 114         subcall->callback = callback;
 115         subcall->closure = closure;
 116         return subcall;
 117 }
 118
 119 void afb_subcall(
 120                 struct afb_xreq *caller,
 121                 const char *api,
 122                 const char *verb,
 123                 struct json_object *args,
 124                 void (*callback)(void*, int, struct json_object*),
 125                 void *closure
 126 )
 127 {
 128         struct subcall *subcall;
 129
 130         subcall = create_subcall(caller, api, verb, args, callback, closure);
 131         if (subcall == NULL) {
 132                 afb_subcall_internal_error(callback, closure);
 133                 return;
 134         }
 135
 136         afb_xreq_addref(caller);
 137         afb_apis_call(&subcall->xreq);
 138         afb_xreq_unref(&subcall->xreq);
 139 }
 140
 141