DP: Introduce new interface for backend

Terminology:
* Backend: Implemenation of domain
* Data Provider: interface between backend and responders
* Module: ldap/ipa/ad/... dlopened library that implements dp interface
* Target: id/autofs/sudo/... functionality of module

Benefits over current code:
* data provider is a black box completely separated from backend
* method handlers are just simple tevent requests on backend side
* no need of spy on be_client
* simplified and error proof adding of new responders
* simplified adding of new methods
* reply to D-Bus message is completely handled by DP code
* each target can have several methods defined
* properties can be added on objects
* each method can have output parameters
* modules now support constructor
* improved debugging
* clear memory hierarchy
* ability to chain requests
* type safe private data

Reviewed-by: Sumit Bose <sbose@redhat.com>
Reviewed-by: Jakub Hrozek <jhrozek@redhat.com>
Reviewed-by: Lukáš Slebodník <lslebodn@redhat.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/src/providers/backend.h b/src/providers/backend.h
index cfb9044b5..e91ed9c3e 100644
--- a/src/providers/backend.h
+++ b/src/providers/backend.h
@@ -25,6 +25,7 @@
 #include "providers/data_provider.h"
 #include "providers/fail_over.h"
 #include "providers/be_refresh.h"
+#include "providers/data_provider/dp.h"
 #include "util/child_common.h"
 #include "db/sysdb.h"
 
@@ -148,6 +149,8 @@ struct be_ctx {
 
     /* List of ongoing requests */
     struct be_req *active_requests;
+
+    struct data_provider *provider;
 };
 
 struct bet_ops {