Rework transaction code to use tevent_req

This is part of a set of patches to rewrite sysdb to a hopefully better
API, that will also let use use tevent_req async style calls to manipulate
our cache.

1 files changed, 23 insertions, 2 deletions

diff --git a/server/db/sysdb_private.h b/server/db/sysdb_private.h
index 8c10d9519..d15ec370a 100644
--- a/server/db/sysdb_private.h
+++ b/server/db/sysdb_private.h
@@ -68,15 +68,36 @@
 
 #include "db/sysdb.h"
 
-struct sysdb_handle;
+struct sysdb_handle {
+    struct sysdb_handle *prev;
+    struct sysdb_handle *next;
+
+    struct sysdb_ctx *ctx;
+    struct tevent_req *subreq;
+
+    bool transaction_active;
+};
 
 struct sysdb_ctx {
     struct tevent_context *ev;
     struct ldb_context *ldb;
     char *ldb_file;
+
     struct sysdb_handle *queue;
 };
 
-bool sysdb_handle_check_running(struct sysdb_handle *handle);
+/* An operation blocks the transaction queue as well, but does not
+ * start a transaction, normally useful only for search type calls.
+ * do *NOT* call within a transaction you'll deadlock sysdb.
+ * Also make sure to free the handle as soon as the operation is
+ * finished to avoid stalling or potentially deadlocking sysdb */
+
+struct tevent_req *sysdb_operation_send(TALLOC_CTX *mem_ctx,
+                                        struct tevent_context *ev,
+                                        struct sysdb_ctx *ctx);
+int sysdb_operation_recv(struct tevent_req *req, TALLOC_CTX *memctx,
+                         struct sysdb_handle **handle);
+
+void sysdb_operation_done(struct sysdb_handle *handle);
 
 #endif /* __INT_SYS_DB_H__ */