#include <json-c/json.h>
-#include <afb/afb-binding-v1.h>
-#include <afb/afb-binding-v2.h>
+#define AFB_BINDING_VERSION 0
+#include <afb/afb-binding.h>
#include "afb-api.h"
#include "afb-apiset.h"
+#include "afb-api-dyn.h"
#include "afb-common.h"
#include "afb-cred.h"
#include "afb-evt.h"
#include "jobs.h"
#include "verbose.h"
-
/*************************************************************************
* internal types and structures
************************************************************************/
enum afb_api_version
{
- Api_Version_None = 0,
+ Api_Version_Dyn = 0,
Api_Version_1 = 1,
Api_Version_2 = 2,
- Api_Version_3 = 3
};
enum afb_api_state
struct afb_export
{
+ /* keep it first */
+ struct afb_dynapi dynapi;
+
/* name of the api */
char *apiname;
int hookditf;
int hooksvc;
+ /* dynamic api */
+ struct afb_api_dyn *apidyn;
+
/* session for service */
struct afb_session *session;
union {
int (*v1)(struct afb_service);
int (*v2)();
+ int (*vdyn)(struct afb_dynapi *dynapi);
} init;
/* event handling */
union {
void (*v12)(const char *event, struct json_object *object);
+ void (*vdyn)(struct afb_dynapi *dynapi, const char *event, struct json_object *object);
} on_event;
/* exported data */
} export;
};
+/************************************************************************************************************/
+
+static inline struct afb_dynapi *to_dynapi(struct afb_export *export)
+{
+ return (struct afb_dynapi*)export;
+}
+
+static inline struct afb_export *from_dynapi(struct afb_dynapi *dynapi)
+{
+ return (struct afb_export*)dynapi;
+}
+
/*************************************************************************************************************
*************************************************************************************************************
*************************************************************************************************************
vverbose_cb(closure, level, file, line, NULL, fmt, args);
}
-static struct afb_event event_make_cb(void *closure, const char *name)
+static struct afb_eventid *eventid_make_cb(void *closure, const char *name)
{
size_t plen, nlen;
char *event;
struct afb_export *export = closure;
- struct afb_eventid *eventid;
/* check daemon state */
if (export->state == Api_State_Pre_Init) {
ERROR("[API %s] Bad call to 'afb_daemon_event_make(%s)', must not be in PreInit", export->apiname, name);
errno = EINVAL;
- return (struct afb_event){ .itf = NULL, .closure = NULL };
+ return NULL;
}
/* makes the event name */
memcpy(event + plen + 1, name, nlen + 1);
/* create the event */
- eventid = afb_evt_create_event(event);
+ return afb_evt_eventid_create(event);
+}
+
+static struct afb_event event_make_cb(void *closure, const char *name)
+{
+ struct afb_eventid *eventid = eventid_make_cb(closure, name);
return (struct afb_event){ .itf = eventid ? eventid->itf : NULL, .closure = eventid };
}
return 0;
}
+static int api_new_api_cb(
+ void *closure,
+ const char *api,
+ const char *info,
+ int noconcurrency,
+ int (*preinit)(void*, struct afb_dynapi *),
+ void *preinit_closure)
+{
+ struct afb_export *export = closure;
+ return afb_api_dyn_add(export->apiset, api, info, noconcurrency, preinit, preinit_closure);
+}
+
/**********************************************
* hooked flow
**********************************************/
hooked_vverbose_cb(closure, level, file, line, NULL, fmt, args);
}
-static struct afb_event hooked_event_make_cb(void *closure, const char *name)
+static struct afb_eventid *hooked_eventid_make_cb(void *closure, const char *name)
{
struct afb_export *export = closure;
- struct afb_event r = event_make_cb(closure, name);
- afb_hook_ditf_event_make(export, name, r.closure);
+ struct afb_eventid *r = eventid_make_cb(closure, name);
+ afb_hook_ditf_event_make(export, name, r);
return r;
}
+static struct afb_event hooked_event_make_cb(void *closure, const char *name)
+{
+ struct afb_eventid *eventid = hooked_eventid_make_cb(closure, name);
+ return (struct afb_event){ .itf = eventid ? eventid->itf : NULL, .closure = eventid };
+}
+
static int hooked_event_broadcast_cb(void *closure, const char *name, struct json_object *object)
{
int r;
return afb_hook_ditf_rename_api(export, oldname, name, result);
}
+static int hooked_api_new_api_cb(
+ void *closure,
+ const char *api,
+ const char *info,
+ int noconcurrency,
+ int (*preinit)(void*, struct afb_dynapi *),
+ void *preinit_closure)
+{
+ /* TODO */
+ return api_new_api_cb(closure, api, info, noconcurrency, preinit, preinit_closure);
+}
/**********************************************
* vectors
**********************************************/
.queue_job = queue_job_cb,
.unstore_req = unstore_req_cb,
.require_api = require_api_cb,
- .rename_api = rename_api_cb
+ .rename_api = rename_api_cb,
+ .new_api = api_new_api_cb,
};
static const struct afb_daemon_itf hooked_daemon_itf = {
.queue_job = hooked_queue_job_cb,
.unstore_req = hooked_unstore_req_cb,
.require_api = hooked_require_api_cb,
- .rename_api = hooked_rename_api_cb
+ .rename_api = hooked_rename_api_cb,
+ .new_api = hooked_api_new_api_cb,
};
-
/*************************************************************************************************************
*************************************************************************************************************
*************************************************************************************************************
struct afb_export *export;
/* the args */
- void (*callback)(void*, int, struct json_object*);
+ union {
+ void (*callback)(void*, int, struct json_object*);
+ void (*callback_dynapi)(void*, int, struct json_object*, struct afb_dynapi*);
+ };
void *closure;
/* sync */
free(callreq);
}
-static void callreq_reply(struct afb_xreq *xreq, int status, json_object *obj)
+static void callreq_reply_async(struct afb_xreq *xreq, int status, json_object *obj)
{
struct call_req *callreq = CONTAINER_OF_XREQ(struct call_req, xreq);
if (callreq->callback)
json_object_put(obj);
}
+static void callreq_reply_async_dynapi(struct afb_xreq *xreq, int status, json_object *obj)
+{
+ struct call_req *callreq = CONTAINER_OF_XREQ(struct call_req, xreq);
+ if (callreq->callback_dynapi)
+ callreq->callback_dynapi(callreq->closure, status, obj, to_dynapi(callreq->export));
+ json_object_put(obj);
+}
+
static void callreq_sync_leave(struct call_req *callreq)
{
struct jobloop *jobloop = callreq->jobloop;
}
/* interface for requests of services */
-const struct afb_xreq_query_itf afb_export_xreq_itf = {
+const struct afb_xreq_query_itf afb_export_xreq_async_itf = {
+ .unref = callreq_destroy,
+ .reply = callreq_reply_async
+};
+
+/* interface for requests of services */
+const struct afb_xreq_query_itf afb_export_xreq_async_dynapi_itf = {
.unref = callreq_destroy,
- .reply = callreq_reply
+ .reply = callreq_reply_async_dynapi
};
/* interface for requests of services */
/*
* create an call_req
*/
-static struct call_req *callreq_create(struct afb_export *export, const char *api, const char *verb, struct json_object *args, const struct afb_xreq_query_itf *itf)
+static struct call_req *callreq_create(
+ struct afb_export *export,
+ const char *api,
+ const char *verb,
+ struct json_object *args,
+ const struct afb_xreq_query_itf *itf)
{
struct call_req *callreq;
size_t lenapi, lenverb;
callreq->xreq.context.validated = 1;
copy = (char*)&callreq[1];
memcpy(copy, api, lenapi);
- callreq->xreq.api = copy;
+ callreq->xreq.request.api = copy;
copy = ©[lenapi];
memcpy(copy, verb, lenverb);
- callreq->xreq.verb = copy;
+ callreq->xreq.request.verb = copy;
callreq->xreq.listener = export->listener;
callreq->xreq.json = args;
callreq->export = export;
/*
* Initiates a call for the service
*/
-static void svc_call(void *closure, const char *api, const char *verb, struct json_object *args, void (*callback)(void*, int, struct json_object*), void *cbclosure)
+static void svc_call(
+ void *closure,
+ const char *api,
+ const char *verb,
+ struct json_object *args,
+ void (*callback)(void*, int, struct json_object*),
+ void *cbclosure)
{
struct afb_export *export = closure;
struct call_req *callreq;
struct json_object *ierr;
/* allocates the request */
- callreq = callreq_create(export, api, verb, args, &afb_export_xreq_itf);
+ callreq = callreq_create(export, api, verb, args, &afb_export_xreq_async_itf);
if (callreq == NULL) {
ERROR("out of memory");
json_object_put(args);
afb_xreq_process(&callreq->xreq, export->apiset);
}
-static int svc_call_sync(void *closure, const char *api, const char *verb, struct json_object *args,
- struct json_object **result)
+static void svc_call_dynapi(
+ struct afb_dynapi *dynapi,
+ const char *api,
+ const char *verb,
+ struct json_object *args,
+ void (*callback)(void*, int, struct json_object*, struct afb_dynapi*),
+ void *cbclosure)
+{
+ struct afb_export *export = from_dynapi(dynapi);
+ struct call_req *callreq;
+ struct json_object *ierr;
+
+ /* allocates the request */
+ callreq = callreq_create(export, api, verb, args, &afb_export_xreq_async_dynapi_itf);
+ if (callreq == NULL) {
+ ERROR("out of memory");
+ json_object_put(args);
+ ierr = afb_msg_json_internal_error();
+ if (callback)
+ callback(cbclosure, -1, ierr, to_dynapi(export));
+ json_object_put(ierr);
+ return;
+ }
+
+ /* initialises the request */
+ callreq->jobloop = NULL;
+ callreq->callback_dynapi = callback;
+ callreq->closure = cbclosure;
+
+ /* terminates and frees ressources if needed */
+ afb_xreq_process(&callreq->xreq, export->apiset);
+}
+
+static int svc_call_sync(
+ void *closure,
+ const char *api,
+ const char *verb,
+ struct json_object *args,
+ struct json_object **result)
{
struct afb_export *export = closure;
struct call_req *callreq;
struct hooked_call
{
struct afb_export *export;
- void (*callback)(void*, int, struct json_object*);
+ union {
+ void (*callback)(void*, int, struct json_object*);
+ void (*callback_dynapi)(void*, int, struct json_object*, struct afb_dynapi*);
+ };
void *cbclosure;
};
free(hc);
}
-static void svc_hooked_call(void *closure, const char *api, const char *verb, struct json_object *args, void (*callback)(void*, int, struct json_object*), void *cbclosure)
+static void svc_hooked_call_dynapi_result(void *closure, int status, struct json_object *result, struct afb_dynapi *dynapi)
+{
+ struct hooked_call *hc = closure;
+ afb_hook_svc_call_result(hc->export, status, result);
+ hc->callback_dynapi(hc->cbclosure, status, result, dynapi);
+ free(hc);
+}
+
+static void svc_hooked_call(
+ void *closure,
+ const char *api,
+ const char *verb,
+ struct json_object *args,
+ void (*callback)(void*, int, struct json_object*),
+ void *cbclosure)
{
struct afb_export *export = closure;
struct hooked_call *hc;
svc_call(closure, api, verb, args, callback, cbclosure);
}
-static int svc_hooked_call_sync(void *closure, const char *api, const char *verb, struct json_object *args,
- struct json_object **result)
+static void svc_hooked_call_dynapi(
+ struct afb_dynapi *dynapi,
+ const char *api,
+ const char *verb,
+ struct json_object *args,
+ void (*callback)(void*, int, struct json_object*, struct afb_dynapi*),
+ void *cbclosure)
+{
+ struct afb_export *export = from_dynapi(dynapi);
+ struct hooked_call *hc;
+
+ if (export->hooksvc & afb_hook_flag_svc_call)
+ afb_hook_svc_call(export, api, verb, args);
+
+ if (export->hooksvc & afb_hook_flag_svc_call_result) {
+ hc = malloc(sizeof *hc);
+ if (!hc)
+ WARNING("allocation failed");
+ else {
+ hc->export = export;
+ hc->callback_dynapi = callback;
+ hc->cbclosure = cbclosure;
+ callback = svc_hooked_call_dynapi_result;
+ cbclosure = hc;
+ }
+ }
+ svc_call_dynapi(dynapi, api, verb, args, callback, cbclosure);
+}
+
+static int svc_hooked_call_sync(
+ void *closure,
+ const char *api,
+ const char *verb,
+ struct json_object *args,
+ struct json_object **result)
{
struct afb_export *export = closure;
struct json_object *resu;
.call_sync = svc_hooked_call_sync
};
+/*************************************************************************************************************
+ *************************************************************************************************************
+ *************************************************************************************************************
+ *************************************************************************************************************
+ F R O M D Y N A P I
+ *************************************************************************************************************
+ *************************************************************************************************************
+ *************************************************************************************************************
+ *************************************************************************************************************/
+
+static int api_set_verbs_v2_cb(
+ struct afb_dynapi *dynapi,
+ const struct afb_verb_v2 *verbs)
+{
+ struct afb_export *export = from_dynapi(dynapi);
+
+ if (export->apidyn) {
+ afb_api_dyn_set_verbs_v2(export->apidyn, verbs);
+ return 0;
+ }
+
+ errno = EPERM;
+ return -1;
+}
+
+static int api_add_verb_cb(
+ struct afb_dynapi *dynapi,
+ const char *verb,
+ const char *info,
+ void (*callback)(struct afb_request *request),
+ void *vcbdata,
+ const struct afb_auth *auth,
+ uint32_t session)
+{
+ struct afb_export *export = from_dynapi(dynapi);
+
+ if (export->apidyn)
+ return afb_api_dyn_add_verb(export->apidyn, verb, info, callback, vcbdata, auth, session);
+
+ errno = EPERM;
+ return -1;
+}
+
+static int api_sub_verb_cb(
+ struct afb_dynapi *dynapi,
+ const char *verb)
+{
+ struct afb_export *export = from_dynapi(dynapi);
+
+ if (export->apidyn)
+ return afb_api_dyn_sub_verb(export->apidyn, verb);
+
+ errno = EPERM;
+ return -1;
+}
+
+static int api_set_on_event_cb(
+ struct afb_dynapi *dynapi,
+ void (*onevent)(struct afb_dynapi *dynapi, const char *event, struct json_object *object))
+{
+ struct afb_export *export = from_dynapi(dynapi);
+ return afb_export_handle_events_vdyn(export, onevent);
+}
+
+static int api_set_on_init_cb(
+ struct afb_dynapi *dynapi,
+ int (*oninit)(struct afb_dynapi *dynapi))
+{
+ struct afb_export *export = from_dynapi(dynapi);
+
+ return afb_export_handle_init_vdyn(export, oninit);
+}
+
+static void api_seal_cb(
+ struct afb_dynapi *dynapi)
+{
+ struct afb_export *export = from_dynapi(dynapi);
+
+ export->apidyn = NULL;
+}
+
+static int hooked_api_set_verbs_v2_cb(
+ struct afb_dynapi *dynapi,
+ const struct afb_verb_v2 *verbs)
+{
+ /* TODO */
+ return api_set_verbs_v2_cb(dynapi, verbs);
+}
+
+static int hooked_api_add_verb_cb(
+ struct afb_dynapi *dynapi,
+ const char *verb,
+ const char *info,
+ void (*callback)(struct afb_request *request),
+ void *vcbdata,
+ const struct afb_auth *auth,
+ uint32_t session)
+{
+ /* TODO */
+ return api_add_verb_cb(dynapi, verb, info, callback, vcbdata, auth, session);
+}
+
+static int hooked_api_sub_verb_cb(
+ struct afb_dynapi *dynapi,
+ const char *verb)
+{
+ /* TODO */
+ return api_sub_verb_cb(dynapi, verb);
+}
+
+static int hooked_api_set_on_event_cb(
+ struct afb_dynapi *dynapi,
+ void (*onevent)(struct afb_dynapi *dynapi, const char *event, struct json_object *object))
+{
+ /* TODO */
+ return api_set_on_event_cb(dynapi, onevent);
+}
+
+static int hooked_api_set_on_init_cb(
+ struct afb_dynapi *dynapi,
+ int (*oninit)(struct afb_dynapi *dynapi))
+{
+ /* TODO */
+ return api_set_on_init_cb(dynapi, oninit);
+}
+
+static void hooked_api_seal_cb(
+ struct afb_dynapi *dynapi)
+{
+ /* TODO */
+ api_seal_cb(dynapi);
+}
+
+static const struct afb_dynapi_itf dynapi_itf = {
+
+ .vverbose = (void*)vverbose_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,
+ .rootdir_get_fd = afb_common_rootdir_get_fd,
+ .rootdir_open_locale = rootdir_open_locale_cb,
+ .queue_job = queue_job_cb,
+
+ .require_api = require_api_cb,
+ .rename_api = rename_api_cb,
+
+ .event_broadcast = event_broadcast_cb,
+ .eventid_make = eventid_make_cb,
+
+ .call = svc_call_dynapi,
+ .call_sync = svc_call_sync,
+
+ .api_new_api = api_new_api_cb,
+ .api_set_verbs_v2 = api_set_verbs_v2_cb,
+ .api_add_verb = api_add_verb_cb,
+ .api_sub_verb = api_sub_verb_cb,
+ .api_set_on_event = api_set_on_event_cb,
+ .api_set_on_init = api_set_on_init_cb,
+ .api_seal = api_seal_cb,
+};
+
+static const struct afb_dynapi_itf hooked_dynapi_itf = {
+
+ .vverbose = hooked_vverbose_cb,
+
+ .get_event_loop = hooked_get_event_loop,
+ .get_user_bus = hooked_get_user_bus,
+ .get_system_bus = hooked_get_system_bus,
+ .rootdir_get_fd = hooked_rootdir_get_fd,
+ .rootdir_open_locale = hooked_rootdir_open_locale_cb,
+ .queue_job = hooked_queue_job_cb,
+
+ .require_api = hooked_require_api_cb,
+ .rename_api = hooked_rename_api_cb,
+
+ .event_broadcast = hooked_event_broadcast_cb,
+ .eventid_make = hooked_eventid_make_cb,
+
+ .call = svc_hooked_call_dynapi,
+ .call_sync = svc_hooked_call_sync,
+
+ .api_new_api = hooked_api_new_api_cb,
+ .api_set_verbs_v2 = hooked_api_set_verbs_v2_cb,
+ .api_add_verb = hooked_api_add_verb_cb,
+ .api_sub_verb = hooked_api_sub_verb_cb,
+ .api_set_on_event = hooked_api_set_on_event_cb,
+ .api_set_on_init = hooked_api_set_on_init_cb,
+ .api_seal = hooked_api_seal_cb,
+};
+
/*************************************************************************************************************
*************************************************************************************************************
*************************************************************************************************************
.push = export_on_event_v12
};
+/*
+ * Propagates the event to the service
+ */
+static void export_on_event_vdyn(void *closure, const char *event, int eventid, struct json_object *object)
+{
+ struct afb_export *export = closure;
+
+ if (export->hooksvc & afb_hook_flag_svc_on_event_before)
+ afb_hook_svc_on_event_before(export, event, eventid, object);
+ export->on_event.vdyn(to_dynapi(export), event, object);
+ if (export->hooksvc & afb_hook_flag_svc_on_event_after)
+ afb_hook_svc_on_event_after(export, event, eventid, object);
+ json_object_put(object);
+}
+
+/* the interface for events */
+static const struct afb_evt_itf evt_vdyn_itf = {
+ .broadcast = export_on_event_vdyn,
+ .push = export_on_event_vdyn
+};
+
/*************************************************************************************************************
*************************************************************************************************************
*************************************************************************************************************
/* session shared with other exports */
if (common_session == NULL) {
- common_session = afb_session_create (NULL, 0);
+ common_session = afb_session_create (0);
if (common_session == NULL)
return NULL;
}
else {
memset(export, 0, sizeof *export);
export->apiname = strdup(apiname);
+ export->dynapi.apiname = export->apiname;
export->version = version;
export->state = Api_State_Pre_Init;
export->session = afb_session_addref(common_session);
if (export) {
export->init.v1 = init;
export->on_event.v12 = onevent;
- export->export.v1.verbosity = verbosity;
export->export.v1.mode = AFB_MODE_LOCAL;
export->export.v1.daemon.closure = export;
+ afb_export_verbosity_set(export, verbosity);
afb_export_update_hook(export);
}
return export;
export->init.v2 = init;
export->on_event.v12 = onevent;
export->export.v2 = data;
- data->verbosity = verbosity;
data->daemon.closure = export;
data->service.closure = export;
+ afb_export_verbosity_set(export, verbosity);
+ afb_export_update_hook(export);
+ }
+ return export;
+}
+
+struct afb_export *afb_export_create_vdyn(struct afb_apiset *apiset, const char *apiname, struct afb_api_dyn *apidyn)
+{
+ struct afb_export *export = create(apiset, apiname, Api_Version_Dyn);
+ if (export) {
+ export->apidyn = apidyn;
+ afb_export_verbosity_set(export, verbosity);
afb_export_update_hook(export);
}
return export;
{
free(export->apiname);
export->apiname = strdup(apiname);
+ export->dynapi.apiname = export->apiname;
afb_export_update_hook(export);
}
{
export->hookditf = afb_hook_flags_ditf(export->apiname);
export->hooksvc = afb_hook_flags_svc(export->apiname);
+ export->dynapi.itf = export->hookditf|export->hooksvc ? &hooked_dynapi_itf : &dynapi_itf;
+
switch (export->version) {
case Api_Version_1:
export->export.v1.daemon.itf = export->hookditf ? &hooked_daemon_itf : &daemon_itf;
break;
- default:
case Api_Version_2:
export->export.v2->daemon.itf = export->hookditf ? &hooked_daemon_itf : &daemon_itf;
export->export.v2->service.itf = export->hooksvc ? &hooked_service_itf : &service_itf;
int afb_export_unshare_session(struct afb_export *export)
{
if (export->session == common_session) {
- export->session = afb_session_create (NULL, 0);
+ export->session = afb_session_create (0);
if (export->session)
afb_session_unref(common_session);
else {
return export->apiset;
}
-/*
- * Creates a new service
- */
int afb_export_handle_events_v12(struct afb_export *export, void (*on_event)(const char *event, struct json_object *object))
{
/* check version */
return 0;
}
+int afb_export_handle_events_vdyn(struct afb_export *export, void (*on_event)(struct afb_dynapi *dynapi, const char *event, struct json_object *object))
+{
+ /* check version */
+ switch (export->version) {
+ case Api_Version_Dyn: break;
+ default:
+ ERROR("invalid version Dyn for API %s", export->apiname);
+ errno = EINVAL;
+ return -1;
+ }
+
+ /* set the event handler */
+ if (!on_event) {
+ if (export->listener) {
+ afb_evt_listener_unref(export->listener);
+ export->listener = NULL;
+ }
+ export->on_event.vdyn = on_event;
+ } else {
+ export->on_event.vdyn = on_event;
+ if (!export->listener) {
+ export->listener = afb_evt_listener_create(&evt_vdyn_itf, export);
+ if (export->listener == NULL)
+ return -1;
+ }
+ }
+ return 0;
+}
+
+int afb_export_handle_init_vdyn(struct afb_export *export, int (*oninit)(struct afb_dynapi *dynapi))
+{
+ if (export->state != Api_State_Pre_Init) {
+ ERROR("[API %s] Bad call to 'afb_dynapi_on_init', must be in PreInit", export->apiname);
+ errno = EINVAL;
+ return -1;
+ }
+
+ export->init.vdyn = oninit;
+ return 0;
+}
+
/*
* Starts a new service (v1)
*/
return regfun(&export->export.v1);
}
+int afb_export_preinit_vdyn(struct afb_export *export, int (*preinit)(void*, struct afb_dynapi*), void *closure)
+{
+ return preinit(closure, to_dynapi(export));
+}
+
int afb_export_verbosity_get(const struct afb_export *export)
{
- switch (export->version) {
- case Api_Version_1: return export->export.v1.verbosity;
- case Api_Version_2: return export->export.v2->verbosity;
- }
- return verbosity;
+ return export->dynapi.verbosity;
}
void afb_export_verbosity_set(struct afb_export *export, int level)
{
+ export->dynapi.verbosity = level;
switch (export->version) {
case Api_Version_1: export->export.v1.verbosity = level; break;
case Api_Version_2: export->export.v2->verbosity = level; break;
case Api_Version_2:
rc = export->init.v2 ? export->init.v2() : 0;
break;
+ case Api_Version_Dyn:
+ rc = export->init.vdyn ? export->init.vdyn(to_dynapi(export)) : 0;
+ break;
default:
break;
}
Code Review / src / app-framework-binder.git / blobdiff