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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.
*/
#define _GNU_SOURCE
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include "afb-session.h"
#include "verbose.h"
#include "afb-api.h"
#include "afb-apiset.h"
#include "afb-context.h"
#include "afb-xreq.h"
#define INCR 8 /* CAUTION: must be a power of 2 */
struct afb_apiset;
struct api_desc;
struct api_class;
struct api_alias;
struct api_depend;
/**
* array of items
*/
struct api_array {
int count; /* count of items */
union {
void **anys;
struct api_desc **apis;
struct api_class **classes;
struct api_alias **aliases;
struct api_depend **depends;
};
};
/**
* Internal description of an api
*/
struct api_desc
{
struct api_desc *next;
const char *name; /**< name of the api */
int status; /**< initialisation status */
struct afb_api_item api; /**< handler of the api */
struct {
struct api_array classes;
struct api_array apis;
} require;
};
/**
* internal description of aliases
*/
struct api_alias
{
struct api_alias *next;
struct api_desc *api;
char name[1];
};
/**
*
*/
struct api_class
{
struct api_class *next;
struct api_array providers;
char name[1];
};
/**
*
*/
struct api_depend
{
struct afb_apiset *set;
char name[1];
};
/**
* Data structure for apiset
*/
struct afb_apiset
{
struct api_array apis; /**< the apis */
struct api_alias *aliases; /**< the aliases */
struct afb_apiset *subset; /**< subset if any */
struct {
int (*callback)(void*, struct afb_apiset*, const char*); /* not found handler */
void *closure;
void (*cleanup)(void*);
} onlack; /** not found handler */
int timeout; /**< the timeout in second for the apiset */
int refcount; /**< reference count for freeing resources */
char name[1]; /**< name of the apiset */
};
/**
* global apis
*/
static struct api_desc *all_apis;
/**
* global classes
*/
static struct api_class *all_classes;
/**
* Ensure enough room in 'array' for 'count' items
*/
static int api_array_ensure_count(struct api_array *array, int count)
{
int c;
void **anys;
c = (count + INCR - 1) & ~(INCR - 1);
anys = realloc(array->anys, c * sizeof *anys);
if (!anys) {
errno = ENOMEM;
return -1;
}
array->count = count;
array->anys = anys;
return 0;
}
/**
* Insert in 'array' the item 'any' at the 'index'
*/
static int api_array_insert(struct api_array *array, void *any, int index)
{
int n = array->count;
if (api_array_ensure_count(array, n + 1) < 0)
return -1;
while (index < n) {
array->anys[n] = array->anys[n - 1];
n--;
}
array->anys[index] = any;
return 0;
}
/**
* Add the item 'any' to the 'array'
*/
static int api_array_add(struct api_array *array, void *any)
{
int i, n = array->count;
for (i = 0 ; i < n ; i++) {
if (array->anys[i] == any)
return 0;
}
if (api_array_ensure_count(array, n + 1) < 0)
return -1;
array->anys[n] = any;
return 0;
}
/**
* Delete the 'api' from the 'array'
* Returns 1 if delete or 0 if not found
*/
static int api_array_del(struct api_array *array, void *any)
{
int i = array->count;
while (i) {
if (array->anys[--i] == any) {
array->anys[i] = array->anys[--array->count];
return 1;
}
}
return 0;
}
/**
* Search the class of 'name' and return it.
* In case where the class of 'namle' isn't found, it returns
* NULL when 'create' is null or a fresh created instance if 'create' isn't
* zero (but NULL on allocation failure).
*/
static struct api_class *class_search(const char *name, int create)
{
struct api_class *c;
for (c= all_classes ; c ; c = c->next) {
if (!strcasecmp(name, c->name))
return c;
}
if (!create)
return NULL;
c = calloc(1, strlen(name) + sizeof *c);
if (!c)
errno = ENOMEM;
else {
strcpy(c->name, name);
c->next = all_classes;
all_classes = c;
}
return c;
}
/**
* Search the api of 'name'.
* @param set the api set
* @param name the api name to search
* @return the descriptor if found or NULL otherwise
*/
static struct api_desc *search(struct afb_apiset *set, const char *name)
{
int i, c, up, lo;
struct api_desc *a;
struct api_alias *aliases;
/* dichotomic search of the api */
/* initial slice */
lo = 0;
up = set->apis.count;
while (lo < up) {
/* check the mid of the slice */
i = (lo + up) >> 1;
a = set->apis.apis[i];
c = strcasecmp(a->name, name);
if (c == 0) {
/* found */
return a;
}
/* update the slice */
if (c < 0)
lo = i + 1;
else
up = i;
}
/* linear search of aliases */
aliases = set->aliases;
for(;;) {
if (!aliases)
break;
c = strcasecmp(aliases->name, name);
if (!c)
return aliases->api;
if (c > 0)
break;
aliases = aliases->next;
}
return NULL;
}
/**
* Search the api of 'name' in the apiset and in its subsets.
* @param set the api set
* @param name the api name to search
* @return the descriptor if found or NULL otherwise
*/
static struct api_desc *searchrec(struct afb_apiset *set, const char *name)
{
struct api_desc *result;
do {
result = search(set, name);
} while (result == NULL && (set = set->subset) != NULL);
return result;
}
/**
* Increases the count of references to the apiset and return its address
* @param set the set whose reference count is to be increased
* @return the given apiset
*/
struct afb_apiset *afb_apiset_addref(struct afb_apiset *set)
{
if (set)
__atomic_add_fetch(&set->refcount, 1, __ATOMIC_RELAXED);
return set;
}
/**
* Decreases the count of references to the apiset and frees its
* resources when no more references exists.
* @param set the set to unrefrence
*/
void afb_apiset_unref(struct afb_apiset *set)
{
struct api_alias *a;
struct api_desc *d;
if (set && !__atomic_sub_fetch(&set->refcount, 1, __ATOMIC_RELAXED)) {
afb_apiset_unref(set->subset);
if (set->onlack.cleanup)
set->onlack.cleanup(set->onlack.closure);
while((a = set->aliases)) {
set->aliases = a->next;
free(a);
}
while (set->apis.count) {
d = set->apis.apis[--set->apis.count];
if (d->api.itf->unref)
d->api.itf->unref(d->api.closure);
free(d);
}
free(set->apis.apis);
free(set);
}
}
/**
* Create an apiset
* @param name the name of the apiset
* @param timeout the default timeout in seconds for the apiset
* @return the created apiset or NULL in case of error
*/
struct afb_apiset *afb_apiset_create(const char *name, int timeout)
{
struct afb_apiset *set;
set = calloc(1, (name ? strlen(name) : 0) + sizeof *set);
if (set) {
set->timeout = timeout;
set->refcount = 1;
if (name)
strcpy(set->name, name);
}
return set;
}
/**
* Create an apiset being the last subset of 'set'
* @param set the set to extend with the created subset (can be NULL)
* @param name the name of the created apiset (can be NULL)
* @param timeout the default timeout in seconds for the created apiset
* @return the created apiset or NULL in case of error
*/
struct afb_apiset *afb_apiset_create_subset_last(struct afb_apiset *set, const char *name, int timeout)
{
if (set)
while (set->subset)
set = set->subset;
return afb_apiset_create_subset_first(set, name, timeout);
}
/**
* Create an apiset being the first subset of 'set'
* @param set the set to extend with the created subset (can be NULL)
* @param name the name of the created apiset (can be NULL)
* @param timeout the default timeout in seconds for the created apiset
* @return the created apiset or NULL in case of error
*/
struct afb_apiset *afb_apiset_create_subset_first(struct afb_apiset *set, const char *name, int timeout)
{
struct afb_apiset *result = afb_apiset_create(name, timeout);
if (result && set) {
result->subset = set->subset;
set->subset = result;
}
return result;
}
/**
* the name of the apiset
* @param set the api set
* @return the name of the set
*/
const char *afb_apiset_name(struct afb_apiset *set)
{
return set->name;
}
/**
* Get the API timeout of the set
* @param set the api set
* @return the timeout in seconds
*/
int afb_apiset_timeout_get(struct afb_apiset *set)
{
return set->timeout;
}
/**
* Set the API timeout of the set
* @param set the api set
* @param to the timeout in seconds
*/
void afb_apiset_timeout_set(struct afb_apiset *set, int to)
{
set->timeout = to;
}
/**
* Get the subset of the set
* @param set the api set
* @return the subset of set
*/
struct afb_apiset *afb_apiset_subset_get(struct afb_apiset *set)
{
return set->subset;
}
/**
* Set the subset of the set
* @param set the api set
* @param subset the subset to set
*/
void afb_apiset_subset_set(struct afb_apiset *set, struct afb_apiset *subset)
{
struct afb_apiset *tmp;
if (subset == set) {
/* avoid infinite loop */
subset = NULL;
}
tmp = set->subset;
set->subset = afb_apiset_addref(subset);
afb_apiset_unref(tmp);
}
void afb_apiset_onlack_set(struct afb_apiset *set, int (*callback)(void*, struct afb_apiset*, const char*), void *closure, void (*cleanup)(void*))
{
if (set->onlack.cleanup)
set->onlack.cleanup(set->onlack.closure);
set->onlack.callback = callback;
set->onlack.closure = closure;
set->onlack.cleanup = cleanup;
}
/**
* Adds the api of 'name' described by 'api'.
* @param set the api set
* @param name the name of the api to add (have to survive, not copied!)
* @param api the api
* @returns 0 in case of success or -1 in case
* of error with errno set:
* - EEXIST if name already registered
* - ENOMEM when out of memory
*/
int afb_apiset_add(struct afb_apiset *set, const char *name, struct afb_api_item api)
{
struct api_desc *desc;
int i, c;
/* check whether it exists already */
if (search(set, name)) {
ERROR("api of name %s already exists", name);
errno = EEXIST;
goto error;
}
/* search insertion place */
for (i = 0 ; i < set->apis.count ; i++) {
c = strcasecmp(set->apis.apis[i]->name, name);
if (c > 0)
break;
}
/* allocates memory */
desc = calloc(1, sizeof *desc);
if (!desc)
goto oom;
desc->status = -1;
desc->api = api;
desc->name = name;
if (api_array_insert(&set->apis, desc, i) < 0) {
free(desc);
goto error;
}
desc->next = all_apis;
all_apis = desc;
INFO("API %s added", name);
return 0;
oom:
ERROR("out of memory");
errno = ENOMEM;
error:
return -1;
}
/**
* Adds a the 'alias' name to the api of 'name'.
* @params set the api set
* @param name the name of the api to alias
* @param alias the aliased name to add to the api of name
* @returns 0 in case of success or -1 in case
* of error with errno set:
* - ENOENT if the api doesn't exist
* - EEXIST if name (of alias) already registered
* - ENOMEM when out of memory
*/
int afb_apiset_add_alias(struct afb_apiset *set, const char *name, const char *alias)
{
struct api_desc *api;
struct api_alias *ali, **pali;
/* check alias doesn't already exist */
if (search(set, alias)) {
ERROR("api of name %s already exists", alias);
errno = EEXIST;
goto error;
}
/* check aliased api exists */
api = search(set, name);
if (api == NULL) {
ERROR("api of name %s doesn't exists", name);
errno = ENOENT;
goto error;
}
/* allocates and init the struct */
ali = malloc(sizeof *ali + strlen(alias));
if (ali == NULL) {
ERROR("out of memory");
errno = ENOMEM;
goto error;
}
ali->api = api;
strcpy(ali->name, alias);
/* insert the alias in the sorted order */
pali = &set->aliases;
while(*pali && strcmp((*pali)->name, alias) < 0)
pali = &(*pali)->next;
ali->next = *pali;
*pali = ali;
return 0;
error:
return -1;
}
int afb_apiset_is_alias(struct afb_apiset *set, const char *name)
{
struct api_desc *api = searchrec(set, name);
return api && strcasecmp(api->name, name);
}
const char *afb_apiset_unalias(struct afb_apiset *set, const char *name)
{
struct api_desc *api = searchrec(set, name);
return api ? api->name : NULL;
}
/**
* Delete from the 'set' the api of 'name'.
* @param set the set to be changed
* @param name the name of the API to remove
* @return 0 in case of success or -1 in case where the API doesn't exist.
*/
int afb_apiset_del(struct afb_apiset *set, const char *name)
{
struct api_class *cla;
struct api_alias *ali, **pali;
struct api_desc *desc, **pdesc, *odesc;
int i, c;
/* search the alias */
pali = &set->aliases;
while ((ali = *pali)) {
c = strcasecmp(ali->name, name);
if (!c) {
*pali = ali->next;
free(ali);
return 0;
}
if (c > 0)
break;
pali = &ali->next;
}
/* search the api */
for (i = 0 ; i < set->apis.count ; i++) {
desc = set->apis.apis[i];
c = strcasecmp(desc->name, name);
if (c == 0) {
/* remove from classes */
for (cla = all_classes ; cla ; cla = cla->next)
api_array_del(&cla->providers, desc);
/* unlink from the whole set and their requires */
pdesc = &all_apis;
while ((odesc = *pdesc) != desc) {
pdesc = &odesc->next;
}
*pdesc = odesc = desc->next;
while (odesc) {
odesc = odesc->next;
}
/* remove references from classes */
free(desc->require.classes.classes);
/* drop the aliases */
pali = &set->aliases;
while ((ali = *pali)) {
if (ali->api != desc)
pali = &ali->next;
else {
*pali = ali->next;
free(ali);
}
}
/* unref the api */
if (desc->api.itf->unref)
desc->api.itf->unref(desc->api.closure);
set->apis.count--;
while(i < set->apis.count) {
set->apis.apis[i] = set->apis.apis[i + 1];
i++;
}
free(desc);
return 0;
}
if (c > 0)
break;
}
errno = ENOENT;
return -1;
}
/**
* Get from the 'set' the API of 'name' in 'api' with fallback to subset or default api
* @param set the set of API
* @param name the name of the API to get
* @param rec if not zero look also recursively in subsets
* @return the api pointer in case of success or NULL in case of error
*/
static struct api_desc *lookup(struct afb_apiset *set, const char *name, int rec)
{
struct api_desc *result;
result = search(set, name);
while (!result) {
/* lacking the api, try onlack behaviour */
if (set->onlack.callback && set->onlack.callback(set->onlack.closure, set, name) > 0) {
result = search(set, name);
if (result)
break;
}
if (!rec || !(set = set->subset))
break;
result = search(set, name);
}
return result;
}
/**
* Get from the 'set' the API of 'name' in 'api'
* @param set the set of API
* @param name the name of the API to get
* @param rec if not zero look also recursively in subsets
* @return the api pointer in case of success or NULL in case of error
*/
const struct afb_api_item *afb_apiset_lookup(struct afb_apiset *set, const char *name, int rec)
{
struct api_desc *i;
i = lookup(set, name, rec);
if (i)
return &i->api;
errno = ENOENT;
return NULL;
}
static int start_api(struct api_desc *api, int share_session, int onneed);
/**
* Start the apis of the 'array'
* The attribute 'share_session' is sent to the start function.
*/
static int start_array_apis(struct api_array *array, int share_session)
{
int i, rc = 0, rc2;
i = array->count;
while (i) {
rc2 = start_api(array->apis[--i], share_session, 1);
if (rc2 < 0) {
rc = rc2;
}
}
return rc;
}
/**
* Start the class 'cla' (start the apis that provide it).
* The attribute 'share_session' is sent to the start function.
*/
static int start_class(struct api_class *cla, int share_session)
{
return start_array_apis(&cla->providers, share_session);
}
/**
* Start the classes of the 'array'
* The attribute 'share_session' is sent to the start function.
*/
static int start_array_classes(struct api_array *array, int share_session)
{
int i, rc = 0, rc2;
i = array->count;
while (i) {
rc2 = start_class(array->classes[--i], share_session);
if (rc2 < 0) {
rc = rc2;
}
}
return rc;
}
/**
* Start the depends of the 'array'
* The attribute 'share_session' is sent to the start function.
*/
static int start_array_depends(struct api_array *array, int share_session)
{
struct api_desc *api;
int i, rc = 0, rc2;
i = array->count;
while (i) {
i--;
api = searchrec(array->depends[i]->set, array->depends[i]->name);
if (!api)
rc = -1;
else {
rc2 = start_api(api, share_session, 1);
if (rc2 < 0) {
rc = rc2;
}
}
}
return rc;
}
/**
* Starts the service 'api'.
* @param api the api
* @param share_session if true start the servic"e in a shared session
* if false start it in its own session
* @param onneed if true start the service if possible, if false the api
* must be a service
* @return a positive number on success
*/
static int start_api(struct api_desc *api, int share_session, int onneed)
{
int rc;
if (api->status == 0)
return 0;
else if (api->status > 0) {
errno = api->status;
return -1;
}
INFO("API %s starting...", api->name);
rc = start_array_classes(&api->require.classes, share_session);
rc = start_array_depends(&api->require.apis, share_session);
if (api->api.itf->service_start) {
api->status = EBUSY;
rc = api->api.itf->service_start(api->api.closure, share_session, onneed);
if (rc < 0) {
api->status = errno ?: ECANCELED;
ERROR("The api %s failed to start (%d)", api->name, rc);
return -1;
}
} else if (!onneed) {
/* already started: it is an error */
ERROR("The api %s is not a startable service", api->name);
api->status = EINVAL;
return -1;
}
NOTICE("API %s started", api->name);
api->status = 0;
return 0;
}
/**
* Get from the 'set' the API of 'name' in 'api'
* @param set the set of API
* @param name the name of the API to get
* @param rec if not zero look also recursively in subsets
* @return 0 in case of success or -1 in case of error
*/
const struct afb_api_item *afb_apiset_lookup_started(struct afb_apiset *set, const char *name, int rec)
{
struct api_desc *i;
i = lookup(set, name, rec);
if (i)
return i->status && start_api(i, 1, 1) ? NULL : &i->api;
errno = ENOENT;
return NULL;
}
/**
* Starts a service by its 'api' name.
* @param set the api set
* @param name name of the service to start
* @param share_session if true start the servic"e in a shared session
* if false start it in its own session
* @param onneed if true start the service if possible, if false the api
* must be a service
* @return a positive number on success
*/
int afb_apiset_start_service(struct afb_apiset *set, const char *name, int share_session, int onneed)
{
struct api_desc *a;
a = searchrec(set, name);
if (!a) {
ERROR("can't find service %s", name);
errno = ENOENT;
return -1;
}
return start_api(a, share_session, onneed);
}
/**
* Starts all possible services but stops at first error.
* @param set the api set
* @param share_session if true start the servic"e in a shared session
* if false start it in its own session
* @return 0 on success or a negative number when an error is found
*/
int afb_apiset_start_all_services(struct afb_apiset *set, int share_session)
{
int rc, ret;
int i;
ret = 0;
while (set) {
i = 0;
while (i < set->apis.count) {
rc = start_api(set->apis.apis[i], share_session, 1);
if (rc < 0)
ret = rc;
i++;
}
set = set->subset;
}
return ret;
}
/**
* Ask to update the hook flags of the 'api'
* @param set the api set
* @param name the api to update (NULL updates all)
*/
void afb_apiset_update_hooks(struct afb_apiset *set, const char *name)
{
struct api_desc **i, **e, *d;
if (!name) {
i = set->apis.apis;
e = &set->apis.apis[set->apis.count];
while (i != e) {
d = *i++;
if (d->api.itf->update_hooks)
d->api.itf->update_hooks(d->api.closure);
}
} else {
d = searchrec(set, name);
if (d && d->api.itf->update_hooks)
d->api.itf->update_hooks(d->api.closure);
}
}
/**
* Set the logmask of the 'api' to 'mask'
* @param set the api set
* @param name the api to set (NULL set all)
*/
void afb_apiset_set_logmask(struct afb_apiset *set, const char *name, int mask)
{
int i;
struct api_desc *d;
if (!name) {
for (i = 0 ; i < set->apis.count ; i++) {
d = set->apis.apis[i];;
if (d->api.itf->set_logmask)
d->api.itf->set_logmask(d->api.closure, mask);
}
} else {
d = searchrec(set, name);
if (d && d->api.itf->set_logmask)
d->api.itf->set_logmask(d->api.closure, mask);
}
}
/**
* Get the logmask level of the 'api'
* @param set the api set
* @param name the api to get
* @return the logmask level or -1 in case of error
*/
int afb_apiset_get_logmask(struct afb_apiset *set, const char *name)
{
const struct api_desc *i;
i = name ? searchrec(set, name) : NULL;
if (!i) {
errno = ENOENT;
return -1;
}
if (!i->api.itf->get_logmask)
return logmask;
return i->api.itf->get_logmask(i->api.closure);
}
/**
* Get the description of the API of 'name'
* @param set the api set
* @param name the api whose description is required
* @return the description or NULL
*/
struct json_object *afb_apiset_describe(struct afb_apiset *set, const char *name)
{
const struct api_desc *i;
i = name ? searchrec(set, name) : NULL;
return i && i->api.itf->describe ? i->api.itf->describe(i->api.closure) : NULL;
}
struct get_names {
union {
struct {
size_t count;
size_t size;
};
struct {
const char **ptr;
char *data;
};
};
int type;
};
static void get_names_count(void *closure, struct afb_apiset *set, const char *name, int isalias)
{
struct get_names *gc = closure;
if ((1 + isalias) & gc->type) {
gc->size += strlen(name);
gc->count++;
}
}
static void get_names_value(void *closure, struct afb_apiset *set, const char *name, int isalias)
{
struct get_names *gc = closure;
if ((1 + isalias) & gc->type) {
*gc->ptr++ = gc->data;
gc->data = stpcpy(gc->data, name) + 1;
}
}
#if !defined(APISET_NO_SORT)
static int get_names_sortcb(const void *a, const void *b)
{
return strcasecmp(*(const char **)a, *(const char **)b);
}
#endif
/**
* Get the list of api names
* @param set the api set
* @param rec recursive
* @param type expected type: 1 names, 3 names+aliases, 2 aliases
* @return a NULL terminated array of api names. Must be freed.
*/
const char **afb_apiset_get_names(struct afb_apiset *set, int rec, int type)
{
struct get_names gc;
size_t size;
const char **names;
gc.count = gc.size = 0;
gc.type = type >= 1 && type <= 3 ? type : 1;
afb_apiset_enum(set, rec, get_names_count, &gc);
size = gc.size + gc.count * (1 + sizeof *names) + sizeof(*names);
names = malloc(size);
if (!names)
errno = ENOMEM;
else {
gc.data = (char*)&names[gc.count + 1];
gc.ptr = names;
afb_apiset_enum(set, rec, get_names_value, &gc);
#if !defined(APISET_NO_SORT)
qsort(names, gc.ptr - names, sizeof *names, get_names_sortcb);
#endif
*gc.ptr = NULL;
}
return names;
}
/**
* Enumerate the api names to a callback.
* @param set the api set
* @param rec should the enumeration be recursive
* @param callback the function to call for each name
* @param closure the closure for the callback
*/
void afb_apiset_enum(
struct afb_apiset *set,
int rec,
void (*callback)(void *closure, struct afb_apiset *set, const char *name, int isalias),
void *closure)
{
int i;
struct afb_apiset *iset;
struct api_desc *d;
struct api_alias *a;
iset = set;
while (iset) {
for (i = 0 ; i < set->apis.count ; i++) {
d = set->apis.apis[i];;
if (searchrec(set, d->name) == d)
callback(closure, iset, d->name, 0);
}
a = iset->aliases;
while (a) {
if (searchrec(set, a->name) == a->api)
callback(closure, iset, a->name, 1);
a = a->next;
}
iset = rec ? iset->subset : NULL;
}
}
/**
* Declare that the api of 'name' requires the api of name 'required'.
* The api is searched in the apiset 'set' and if 'rec' isn't null also in its subset.
* Returns 0 if the declaration successed or -1 in case of failure
* (ENOMEM: allocation failure, ENOENT: api name not found)
*/
int afb_apiset_require(struct afb_apiset *set, const char *name, const char *required)
{
struct api_desc *a;
struct api_depend *d;
int rc = -1;
a = searchrec(set, name);
if (!a)
errno = ENOENT;
else {
d = malloc(strlen(required) + sizeof *d);
if (!d)
errno = ENOMEM;
else {
d->set = set;
strcpy(d->name, required);
rc = api_array_add(&a->require.apis, d);
}
}
return rc;
}
/**
* Declare that the api of name 'apiname' requires the class of name 'classname'.
* Returns 0 if the declaration successed or -1 in case of failure
* (ENOMEM: allocation failure, ENOENT: api name not found)
*/
int afb_apiset_require_class(struct afb_apiset *set, const char *apiname, const char *classname)
{
struct api_desc *a = searchrec(set, apiname);
struct api_class *c = class_search(classname, 1);
return a && c ? api_array_add(&a->require.classes, c) : (errno = ENOENT, -1);
}
/**
* Declare that the api of name 'apiname' provides the class of name 'classname'
* Returns 0 if the declaration successed or -1 in case of failure
* (ENOMEM: allocation failure, ENOENT: api name not found)
*/
int afb_apiset_provide_class(struct afb_apiset *set, const char *apiname, const char *classname)
{
struct api_desc *a = searchrec(set, apiname);
struct api_class *c = class_search(classname, 1);
return a && c ? api_array_add(&c->providers, a) : (errno = ENOENT, -1);
}
/**
* Start any API that provides the class of name 'classname'
* The attribute 'share_session' is sent to the start function.
*/
int afb_apiset_class_start(const char *classname, int share_session)
{
struct api_class *cla = class_search(classname, 0);
return cla ? start_class(cla, share_session) : (errno = ENOENT, -1);
}
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