diff options
author | José Bollo <jose.bollo@iot.bzh> | 2017-03-30 19:02:06 +0200 |
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committer | José Bollo <jose.bollo@iot.bzh> | 2017-03-30 19:02:06 +0200 |
commit | c9ba2ce49808a19a4ef982280a46256797b830ae (patch) | |
tree | 8e62a2bd8276a80642c2b2a5e2f52d6961fdc3de /src/afb-api-so-v2.c | |
parent | c710a0da4ebcc126275c42a0387ff85b2557e3ae (diff) |
Start to implement the bindings V2
More work has to be done for merging common
code.
Change-Id: I72b01901f978854843967c12bfcb3cc59cc10310
Signed-off-by: José Bollo <jose.bollo@iot.bzh>
Diffstat (limited to 'src/afb-api-so-v2.c')
-rw-r--r-- | src/afb-api-so-v2.c | 306 |
1 files changed, 306 insertions, 0 deletions
diff --git a/src/afb-api-so-v2.c b/src/afb-api-so-v2.c new file mode 100644 index 00000000..0c8079c4 --- /dev/null +++ b/src/afb-api-so-v2.c @@ -0,0 +1,306 @@ +/* + * Copyright (C) 2016, 2017 "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 +#define NO_BINDING_VERBOSE_MACRO + +#include <string.h> +#include <dlfcn.h> +#include <assert.h> + +#include <afb/afb-binding.h> + +#include "afb-apis.h" +#include "afb-svc.h" +#include "afb-evt.h" +#include "afb-common.h" +#include "afb-context.h" +#include "afb-api-so.h" +#include "afb-thread.h" +#include "verbose.h" + +/* + * names of symbols + */ +static const char afb_api_so_v2_descriptor[] = "afbBindingV2"; + +/* + * Description of a binding + */ +struct api_so_v2 { + struct afb_binding_v2 *binding; /* descriptor */ + size_t apilength; /* length of the API name */ + void *handle; /* context of dlopen */ + struct afb_svc *service; /* handler for service started */ + struct afb_binding_interface interface; /* interface for the binding */ +}; + +static struct afb_event afb_api_so_event_make_cb(void *closure, const char *name); +static int afb_api_so_event_broadcast_cb(void *closure, const char *name, struct json_object *object); +static void afb_api_so_vverbose_cb(void *closure, int level, const char *file, int line, const char *fmt, va_list args); +static int afb_api_so_rootdir_get_fd(void *closure); +static int afb_api_so_rootdir_open_locale(void *closure, const char *filename, int flags, const char *locale); + +static const struct afb_daemon_itf daemon_itf = { + .event_broadcast = afb_api_so_event_broadcast_cb, + .get_event_loop = afb_common_get_event_loop, + .get_user_bus = afb_common_get_user_bus, + .get_system_bus = afb_common_get_system_bus, + .vverbose = afb_api_so_vverbose_cb, + .event_make = afb_api_so_event_make_cb, + .rootdir_get_fd = afb_api_so_rootdir_get_fd, + .rootdir_open_locale = afb_api_so_rootdir_open_locale +}; + +static struct afb_event afb_api_so_event_make_cb(void *closure, const char *name) +{ + size_t length; + char *event; + struct api_so_v2 *desc = closure; + + /* makes the event name */ + assert(desc->binding != NULL); + length = strlen(name); + event = alloca(length + 2 + desc->apilength); + memcpy(event, desc->binding->api, desc->apilength); + event[desc->apilength] = '/'; + memcpy(event + desc->apilength + 1, name, length + 1); + + /* crate the event */ + return afb_evt_create_event(event); +} + +static int afb_api_so_event_broadcast_cb(void *closure, const char *name, struct json_object *object) +{ + size_t length; + char *event; + struct api_so_v2 *desc = closure; + + /* makes the event name */ + assert(desc->binding != NULL); + length = strlen(name); + event = alloca(length + 2 + desc->apilength); + memcpy(event, desc->binding->api, desc->apilength); + event[desc->apilength] = '/'; + memcpy(event + desc->apilength + 1, name, length + 1); + + return afb_evt_broadcast(event, object); +} + +static void afb_api_so_vverbose_cb(void *closure, int level, const char *file, int line, const char *fmt, va_list args) +{ + char *p; + struct api_so_v2 *desc = closure; + + if (vasprintf(&p, fmt, args) < 0) + vverbose(level, file, line, fmt, args); + else { + verbose(level, file, line, "%s {binding %s}", p, desc->binding->api); + free(p); + } +} + +static int afb_api_so_rootdir_get_fd(void *closure) +{ + return afb_common_rootdir_get_fd(); +} + +static int afb_api_so_rootdir_open_locale(void *closure, const char *filename, int flags, const char *locale) +{ + return afb_common_rootdir_open_locale(filename, flags, locale); +} + +static int call_check(struct afb_req req, struct afb_context *context, const struct afb_verb_v2 *verb) +{ + int stag = (int)verb->session; + + if ((stag & (AFB_SESSION_CREATE|AFB_SESSION_CLOSE|AFB_SESSION_RENEW|AFB_SESSION_CHECK|AFB_SESSION_LOA_EQ)) != 0) { + if (!afb_context_check(context)) { + afb_context_close(context); + afb_req_fail(req, "failed", "invalid token's identity"); + return 0; + } + } + + if ((stag & AFB_SESSION_CREATE) != 0) { + if (afb_context_check_loa(context, 1)) { + afb_req_fail(req, "failed", "invalid creation state"); + return 0; + } + afb_context_change_loa(context, 1); + afb_context_refresh(context); + } + + if ((stag & (AFB_SESSION_CREATE | AFB_SESSION_RENEW)) != 0) + afb_context_refresh(context); + + if ((stag & AFB_SESSION_CLOSE) != 0) { + afb_context_change_loa(context, 0); + afb_context_close(context); + } + + if ((stag & AFB_SESSION_LOA_GE) != 0) { + int loa = (stag >> AFB_SESSION_LOA_SHIFT) & AFB_SESSION_LOA_MASK; + if (!afb_context_check_loa(context, loa)) { + afb_req_fail(req, "failed", "invalid LOA"); + return 0; + } + } + + if ((stag & AFB_SESSION_LOA_LE) != 0) { + int loa = (stag >> AFB_SESSION_LOA_SHIFT) & AFB_SESSION_LOA_MASK; + if (afb_context_check_loa(context, loa + 1)) { + afb_req_fail(req, "failed", "invalid LOA"); + return 0; + } + } + return 1; +} + +static void call_cb(void *closure, struct afb_req req, struct afb_context *context, const char *strverb) +{ + const struct afb_verb_v2 *verb; + struct api_so_v2 *desc = closure; + + verb = desc->binding->verbs; + while (verb->verb && strcasecmp(verb->verb, strverb)) + verb++; + if (!verb->verb) + afb_req_fail_f(req, "unknown-verb", "verb %s unknown within api %s", strverb, desc->binding->api); + else if (call_check(req, context, verb)) { + afb_thread_req_call(req, verb->callback, afb_api_so_timeout, desc); + } +} + +static int service_start_cb(void *closure, int share_session, int onneed) +{ + int (*start)(const struct afb_binding_interface *interface, struct afb_service service); + void (*onevent)(const char *event, struct json_object *object); + + struct api_so_v2 *desc = closure; + + /* check state */ + if (desc->service != NULL) { + /* not an error when onneed */ + if (onneed != 0) + return 0; + + /* already started: it is an error */ + ERROR("Service %s already started", desc->binding->api); + return -1; + } + + /* get the initialisation */ + start = desc->binding->start; + if (start == NULL) { + /* not an error when onneed */ + if (onneed != 0) + return 0; + + /* no initialisation method */ + ERROR("Binding %s is not a service", desc->binding->api); + return -1; + } + + /* get the event handler if any */ + onevent = desc->binding->onevent; + desc->service = afb_svc_create_v2(share_session, onevent, start, &desc->interface); + if (desc->service == NULL) { + /* starting error */ + ERROR("Starting service %s failed", desc->binding->api); + return -1; + } + + return 0; +} + +int afb_api_so_v2_add(const char *path, void *handle) +{ + int rc; + struct api_so_v2 *desc; + struct afb_binding_v2 *binding; + + /* retrieves the register function */ + binding = dlsym(handle, afb_api_so_v2_descriptor); + if (!binding) + return 0; + + INFO("binding [%s] looks like an AFB binding V2", path); + + /* basic checks */ + if (binding->api == NULL || *binding->api == 0) { + ERROR("binding [%s] bad api name...", path); + goto error; + } + if (!afb_apis_is_valid_api_name(binding->api)) { + ERROR("binding [%s] invalid api name...", path); + goto error; + } + if (binding->specification == NULL || *binding->specification == 0) { + ERROR("binding [%s] bad specification...", path); + goto error; + } + if (binding->verbs == NULL) { + ERROR("binding [%s] no verbs...", path); + goto error; + } + + /* allocates the description */ + desc = calloc(1, sizeof *desc); + if (desc == NULL) { + ERROR("out of memory"); + goto error; + } + desc->binding = binding; + desc->handle = handle; + + /* init the interface */ + desc->interface.verbosity = verbosity; + desc->interface.mode = AFB_MODE_LOCAL; + desc->interface.daemon.itf = &daemon_itf; + desc->interface.daemon.closure = desc; + + /* for log purpose, a fake binding is needed here */ + + /* init the binding */ + if (binding->init) { + NOTICE("binding %s [%s] calling init function", binding->api, path); + rc = binding->init(&desc->interface); + if (rc < 0) { + ERROR("binding %s [%s] initialisation function failed...", binding->api, path); + goto error2; + } + } + + /* records the binding */ + desc->apilength = strlen(binding->api); + if (afb_apis_add(binding->api, (struct afb_api){ + .closure = desc, + .call = call_cb, + .service_start = service_start_cb }) < 0) { + ERROR("binding [%s] can't be registered...", path); + goto error2; + } + NOTICE("binding %s loaded with API prefix %s", path, binding->api); + return 1; + +error2: + free(desc); +error: + return -1; +} + |