FO: Add an API to reset all servers in a single service

Required for:
    https://fedorahosted.org/sssd/ticket/2639

Previously, we had a function that allowed the caller to reset the
status of all services in the global fail over context. This patch adds
a new function that allows the caller to reset a single service instead.

The main user would be IPA subdomain provider that might need to reset
the status of an AD trusted domain on demand.

Reviewed-by: Sumit Bose <sbose@redhat.com>

4 files changed, 42 insertions, 10 deletions

diff --git a/src/providers/data_provider_fo.c b/src/providers/data_provider_fo.c
index 41d70de06..cd57340a0 100644
--- a/src/providers/data_provider_fo.c
+++ b/src/providers/data_provider_fo.c
@@ -743,6 +743,25 @@ void reset_fo(struct be_ctx *be_ctx)
     fo_reset_services(be_ctx->be_fo->fo_ctx);
 }
 
+void be_fo_reset_svc(struct be_ctx *be_ctx,
+                     const char *svc_name)
+{
+    struct fo_service *service;
+    int ret;
+
+    DEBUG(SSSDBG_TRACE_LIBS,
+          "Resetting all servers in service %s\n", svc_name);
+
+    ret = fo_get_service(be_ctx->be_fo->fo_ctx, svc_name, &service);
+    if (ret != EOK) {
+        DEBUG(SSSDBG_MINOR_FAILURE,
+              "Cannot retrieve service [%s]\n", svc_name);
+        return;
+    }
+
+    fo_reset_servers(service);
+}
+
 void _be_fo_set_port_status(struct be_ctx *ctx,
                             const char *service_name,
                             struct fo_server *server,
diff --git a/src/providers/dp_backend.h b/src/providers/dp_backend.h
index 4bffcee9e..0ced851be 100644
--- a/src/providers/dp_backend.h
+++ b/src/providers/dp_backend.h
@@ -283,6 +283,7 @@ int be_fo_run_callbacks_at_next_request(struct be_ctx *ctx,
                                         const char *service_name);
 
 void reset_fo(struct be_ctx *be_ctx);
+void be_fo_reset_svc(struct be_ctx *be_ctx, const char *svc_name);
 
 errno_t be_res_init(struct be_ctx *ctx);
 
diff --git a/src/providers/fail_over.c b/src/providers/fail_over.c
index 6d835ae0e..562f0b3fd 100644
--- a/src/providers/fail_over.c
+++ b/src/providers/fail_over.c
@@ -1547,21 +1547,31 @@ time_t fo_get_service_retry_timeout(struct fo_service *svc)
     return svc->ctx->opts->retry_timeout;
 }
 
+void fo_reset_servers(struct fo_service *service)
+{
+    struct fo_server *server;
+
+    DLIST_FOR_EACH(server, service->server_list) {
+        if (server->srv_data != NULL) {
+            set_srv_data_status(server->srv_data, SRV_NEUTRAL);
+        } else {
+            fo_set_server_status(server, SERVER_NAME_NOT_RESOLVED);
+        }
+
+        fo_set_port_status(server, PORT_NEUTRAL);
+    }
+}
+
+
 void fo_reset_services(struct fo_ctx *fo_ctx)
 {
     struct fo_service *service;
-    struct fo_server *server;
 
-    DLIST_FOR_EACH(service, fo_ctx->service_list) {
-        DLIST_FOR_EACH(server, service->server_list) {
-            if (server->srv_data != NULL) {
-                set_srv_data_status(server->srv_data, SRV_NEUTRAL);
-            } else {
-                fo_set_server_status(server, SERVER_NAME_NOT_RESOLVED);
-            }
+    DEBUG(SSSDBG_TRACE_LIBS,
+          "Resetting all servers in all services\n");
 
-            fo_set_port_status(server, PORT_NEUTRAL);
-        }
+    DLIST_FOR_EACH(service, fo_ctx->service_list) {
+        fo_reset_servers(service);
     }
 }
 
diff --git a/src/providers/fail_over.h b/src/providers/fail_over.h
index d44ad2ff1..e49c6414a 100644
--- a/src/providers/fail_over.h
+++ b/src/providers/fail_over.h
@@ -198,6 +198,8 @@ time_t fo_get_service_retry_timeout(struct fo_service *svc);
 
 void fo_reset_services(struct fo_ctx *fo_ctx);
 
+void fo_reset_servers(struct fo_service *svc);
+
 bool fo_svc_has_server(struct fo_service *service, struct fo_server *server);
 
 /*