*: simplify frrlib debug

lib/command.c

@@ -17,6 +17,7 @@
 #include <lib/version.h>
 
 #include "command.h"
+#include "debug.h"
 #include "frrstr.h"
 #include "memory.h"
 #include "log.h"
@@ -2463,8 +2464,7 @@ const char *host_config_get(void)
 void cmd_show_lib_debugs(struct vty *vty)
 {
 	route_map_show_debug(vty);
-	mgmt_debug_be_client_show_debug(vty);
-	mgmt_debug_fe_client_show_debug(vty);
+	debug_status_write(vty);
 }
 
 void install_default(enum node_type node)

lib/command.h

@@ -84,14 +84,12 @@ enum node_type {
 	CONFIG_NODE,		 /* Config node. Default mode of config file. */
 	PREFIX_NODE, /* ip prefix-list node. */
 	PREFIX_IPV6_NODE, /* ipv6 prefix-list node. */
+	LIB_DEBUG_NODE,		 /* frrlib debug node. */
 	DEBUG_NODE,		 /* Debug node. */
 	VRF_DEBUG_NODE,		 /* Vrf Debug node. */
-	NORTHBOUND_DEBUG_NODE,	 /* Northbound Debug node. */
 	DEBUG_VNC_NODE,		 /* Debug VNC node. */
 	RMAP_DEBUG_NODE,         /* Route-map debug node */
 	RESOLVER_DEBUG_NODE,	 /* Resolver debug node */
-	MGMT_BE_DEBUG_NODE,	 /* mgmtd backend-client debug node */
-	MGMT_FE_DEBUG_NODE,	 /* mgmtd frontend-client debug node */
 	AAA_NODE,		 /* AAA node. */
 	EXTLOG_NODE,		 /* RFC5424 & co. extended syslog */
 	KEYCHAIN_NODE,		 /* Key-chain node. */

lib/debug.c

@@ -9,42 +9,75 @@
 #include "debug.h"
 #include "command.h"
 
-static struct debug_cb_list_head cb_head;
+static struct debug_list_head debug_head;
 
-DECLARE_LIST(debug_cb_list, struct debug_callbacks, item);
+DECLARE_LIST(debug_list, struct debug, item);
 
 /* All code in this section should be reentrant and MT-safe */
 
-DEFUN_NOSH(debug_all, debug_all_cmd, "[no] debug all",
-	   NO_STR DEBUG_STR "Toggle all debugging output\n")
+DEFUN_NOSH (debug_all,
+	    debug_all_cmd,
+	    "[no] debug all",
+	    NO_STR DEBUG_STR
+	    "Toggle all debugging output\n")
 {
-	struct debug_callbacks *cb;
-
+	struct debug *debug;
 	bool set = !strmatch(argv[0]->text, "no");
 	uint32_t mode = DEBUG_NODE2MODE(vty->node);
 
-	frr_each (debug_cb_list, &cb_head, cb)
-		cb->debug_set_all(mode, set);
+	frr_each (debug_list, &debug_head, debug) {
+		DEBUG_MODE_SET(debug, mode, set);
+
+		/* If all modes have been turned off, don't preserve options. */
+		if (!DEBUG_MODE_CHECK(debug, DEBUG_MODE_ALL))
+			DEBUG_CLEAR(debug);
+	}
 
 	return CMD_SUCCESS;
 }
 
 /* ------------------------------------------------------------------------- */
 
-void debug_init(struct debug_callbacks *cb)
+void debug_status_write(struct vty *vty)
+{
+	struct debug *debug;
+
+	frr_each (debug_list, &debug_head, debug) {
+		if (DEBUG_MODE_CHECK(debug, DEBUG_MODE_ALL))
+			vty_out(vty, "  %s debugging is on\n", debug->desc);
+	}
+}
+
+static int config_write_debug(struct vty *vty)
 {
-	static bool inited = false;
+	struct debug *debug;
 
-	if (!inited) {
-		inited = true;
-		debug_cb_list_init(&cb_head);
+	frr_each (debug_list, &debug_head, debug) {
+		if (DEBUG_MODE_CHECK(debug, DEBUG_MODE_CONF))
+			vty_out(vty, "%s\n", debug->conf);
 	}
 
-	debug_cb_list_add_head(&cb_head, cb);
+	return 0;
 }
 
-void debug_init_cli(void)
+static struct cmd_node debug_node = {
+	.name = "debug",
+	.node = LIB_DEBUG_NODE,
+	.prompt = "",
+	.config_write = config_write_debug,
+};
+
+void debug_install(struct debug *debug)
 {
+	debug_list_add_tail(&debug_head, debug);
+}
+
+void debug_init(void)
+{
+	debug_list_init(&debug_head);
+
+	install_node(&debug_node);
+
 	install_element(ENABLE_NODE, &debug_all_cmd);
 	install_element(CONFIG_NODE, &debug_all_cmd);
 }

lib/debug.h

@@ -34,6 +34,7 @@ extern "C" {
 #define DEBUG_OPT_NONE 0x00000000
 
 
+PREDECL_LIST(debug_list);
 /*
  * Debugging record.
  *
@@ -63,37 +64,18 @@ extern "C" {
  *    manipulate the flags field in a multithreaded environment results in
  *    undefined behavior.
  *
+ * conf
+ *    The configuration string that will be written to the config file.
+ *
  * desc
  *    Human-readable description of this debugging record.
  */
 struct debug {
 	atomic_uint_fast32_t flags;
+	const char *conf;
 	const char *desc;
-};
 
-PREDECL_LIST(debug_cb_list);
-/*
- * Callback set for debugging code.
- *
- * debug_set_all
- *    Function pointer to call when the user requests that all debugs have a
- *    mode set.
- */
-struct debug_callbacks {
-	/*
-	 * Linked list of Callbacks to call
-	 */
-	struct debug_cb_list_item item;
-
-	/*
-	 * flags
-	 *    flags to set on debug flag fields
-	 *
-	 * set
-	 *    true: set flags
-	 *    false: unset flags
-	 */
-	void (*debug_set_all)(uint32_t flags, bool set);
+	struct debug_list_item item;
 };
 
 /*
@@ -217,22 +199,19 @@ struct debug_callbacks {
 #define DEBUGN(name, fmt, ...) DEBUG(notice, name, fmt, ##__VA_ARGS__)
 #define DEBUGD(name, fmt, ...) DEBUG(debug, name, fmt, ##__VA_ARGS__)
 
+/* Show current debugging status. */
+void debug_status_write(struct vty *vty);
+
 /*
- * Optional initializer for debugging. Highly recommended.
- *
- * This function installs common debugging commands and allows the caller to
- * specify callbacks to take when these commands are issued, allowing the
- * caller to respond to events such as a request to turn off all debugs.
- *
- * MT-Safe
+ * Register a debug item.
  */
-void debug_init(struct debug_callbacks *cb);
+void debug_install(struct debug *debug);
 
 /*
- * Turn on the cli to turn on/off debugs.
- * Should only be called by libfrr
+ * Initialize debugging.
+ * Should only be called by libfrr.
  */
-void debug_init_cli(void);
+void debug_init(void);
 
 #ifdef __cplusplus
 }

lib/libfrr.c

@@ -809,6 +809,7 @@ struct event_loop *frr_init(void)
 
 	vty_init(master, di->log_always);
 	lib_cmd_init();
+	debug_init();
 
 	frr_pthread_init();
 #ifdef HAVE_SCRIPTING
@@ -825,8 +826,6 @@ struct event_loop *frr_init(void)
 			  "%s: failed to initialize northbound database",
 			  __func__);
 
-	debug_init_cli();
-
 	return master;
 }
 

lib/mgmt_be_client.c

@@ -116,6 +116,7 @@ struct mgmt_be_client {
 	frr_each_safe (mgmt_be_txns, &(client_ctx)->txn_head, (txn))
 
 struct debug mgmt_dbg_be_client = {
+	.conf = "debug mgmt client backend",
 	.desc = "Management backend client operations"
 };
 
@@ -1258,31 +1259,6 @@ DEFPY(debug_mgmt_client_be, debug_mgmt_client_be_cmd,
 	return CMD_SUCCESS;
 }
 
-static int mgmt_debug_be_client_config_write(struct vty *vty)
-{
-	if (DEBUG_MODE_CHECK(&mgmt_dbg_be_client, DEBUG_MODE_CONF))
-		vty_out(vty, "debug mgmt client backend\n");
-
-	return 1;
-}
-
-void mgmt_debug_be_client_show_debug(struct vty *vty)
-{
-	if (debug_check_be_client())
-		vty_out(vty, "debug mgmt client backend\n");
-}
-
-static struct debug_callbacks mgmt_dbg_be_client_cbs = {
-	.debug_set_all = mgmt_debug_client_be_set
-};
-
-static struct cmd_node mgmt_dbg_node = {
-	.name = "debug mgmt client backend",
-	.node = MGMT_BE_DEBUG_NODE,
-	.prompt = "",
-	.config_write = mgmt_debug_be_client_config_write,
-};
-
 struct mgmt_be_client *mgmt_be_client_create(const char *client_name,
 					     struct mgmt_be_client_cbs *cbs,
 					     uintptr_t user_data,
@@ -1328,8 +1304,8 @@ struct mgmt_be_client *mgmt_be_client_create(const char *client_name,
 
 void mgmt_be_client_lib_vty_init(void)
 {
-	debug_init(&mgmt_dbg_be_client_cbs);
-	install_node(&mgmt_dbg_node);
+	debug_install(&mgmt_dbg_be_client);
+
 	install_element(ENABLE_NODE, &debug_mgmt_client_be_cmd);
 	install_element(CONFIG_NODE, &debug_mgmt_client_be_cmd);
 }

lib/mgmt_be_client.h

@@ -121,11 +121,6 @@ mgmt_be_client_create(const char *name, struct mgmt_be_client_cbs *cbs,
  */
 extern void mgmt_be_client_lib_vty_init(void);
 
-/*
- * Print enabled debugging commands.
- */
-extern void mgmt_debug_be_client_show_debug(struct vty *vty);
-
 /*
  * [Un]-subscribe with MGMTD for one or more YANG subtree(s).
  *

lib/mgmt_fe_client.c

@@ -49,6 +49,7 @@ struct mgmt_fe_client {
 	frr_each_safe (mgmt_sessions, &(client)->sessions, (session))
 
 struct debug mgmt_dbg_fe_client = {
+	.conf = "debug mgmt client frontend",
 	.desc = "Management frontend client operations"
 };
 
@@ -805,31 +806,6 @@ DEFPY(debug_mgmt_client_fe, debug_mgmt_client_fe_cmd,
 	return CMD_SUCCESS;
 }
 
-static int mgmt_debug_fe_client_config_write(struct vty *vty)
-{
-	if (DEBUG_MODE_CHECK(&mgmt_dbg_fe_client, DEBUG_MODE_CONF))
-		vty_out(vty, "debug mgmt client frontend\n");
-
-	return CMD_SUCCESS;
-}
-
-void mgmt_debug_fe_client_show_debug(struct vty *vty)
-{
-	if (debug_check_fe_client())
-		vty_out(vty, "debug mgmt client frontend\n");
-}
-
-static struct debug_callbacks mgmt_dbg_fe_client_cbs = {
-	.debug_set_all = mgmt_debug_client_fe_set
-};
-
-static struct cmd_node mgmt_dbg_node = {
-	.name = "debug mgmt client frontend",
-	.node = MGMT_FE_DEBUG_NODE,
-	.prompt = "",
-	.config_write = mgmt_debug_fe_client_config_write,
-};
-
 /*
  * Initialize library and try connecting with MGMTD.
  */
@@ -870,8 +846,8 @@ struct mgmt_fe_client *mgmt_fe_client_create(const char *client_name,
 
 void mgmt_fe_client_lib_vty_init(void)
 {
-	debug_init(&mgmt_dbg_fe_client_cbs);
-	install_node(&mgmt_dbg_node);
+	debug_install(&mgmt_dbg_fe_client);
+
 	install_element(ENABLE_NODE, &debug_mgmt_client_fe_cmd);
 	install_element(CONFIG_NODE, &debug_mgmt_client_fe_cmd);
 }

lib/mgmt_fe_client.h

@@ -178,11 +178,6 @@ mgmt_fe_client_create(const char *client_name, struct mgmt_fe_client_cbs *cbs,
  */
 extern void mgmt_fe_client_lib_vty_init(void);
 
-/*
- * Print enabled debugging commands.
- */
-extern void mgmt_debug_fe_client_show_debug(struct vty *vty);
-
 /*
  * Create a new Session for a Frontend Client connection.
  *

lib/northbound.h

@@ -799,8 +799,6 @@ DECLARE_HOOK(nb_notification_send, (const char *xpath, struct list *arguments),
 	     (xpath, arguments));
 DECLARE_HOOK(nb_notification_tree_send,
 	     (const char *xpath, const struct lyd_node *tree), (xpath, tree));
-DECLARE_HOOK(nb_client_debug_config_write, (struct vty *vty), (vty));
-DECLARE_HOOK(nb_client_debug_set_all, (uint32_t flags, bool set), (flags, set));
 
 /* Northbound debugging records */
 extern struct debug nb_dbg_cbs_config;