[dm-devel] [PATCH v3 20/35] multipathd: move parse_cmd() to uxlsnr.c

From: mwilck@suse.com
To: Christophe Varoqui <christophe.varoqui@opensvc.com>,
	Benjamin Marzinski <bmarzins@redhat.com>
Cc: lixiaokeng@huawei.com, Chongyun Wu <wu.chongyun@h3c.com>,
	dm-devel@redhat.com, Martin Wilck <mwilck@suse.com>
Subject: [dm-devel] [PATCH v3 20/35] multipathd: move parse_cmd() to uxlsnr.c
Date: Sat, 27 Nov 2021 16:19:13 +0100	[thread overview]
Message-ID: <20211127151929.7727-21-mwilck@suse.com> (raw)
In-Reply-To: <20211127151929.7727-1-mwilck@suse.com>

From: Martin Wilck <mwilck@suse.com>

parse_cmd() does more than the name says - it parses, executes
handlers, and even provides reply strings for some cases. This doesn't
work well with the state machine idea. Thus move it to uxlsnr.c,
where later patches will move some functionality elsewhere.

No functional changes.

Reviewed-by: Benjamin Marzinski <bmarzins@redhat.com>
Signed-off-by: Martin Wilck <mwilck@suse.com>
---
 multipathd/cli.c    | 74 +++++----------------------------------------
 multipathd/cli.h    |  5 ++-
 multipathd/uxlsnr.c | 61 +++++++++++++++++++++++++++++++++++++
 3 files changed, 73 insertions(+), 67 deletions(-)

diff --git a/multipathd/cli.c b/multipathd/cli.c
index 2422ff9..912a078 100644
--- a/multipathd/cli.c
+++ b/multipathd/cli.c
@@ -253,8 +253,7 @@ find_key (const char * str)
  * ESRCH: command not found
  * EINVAL: argument missing for command
  */
-static int
-get_cmdvec (char * cmd, vector *v)
+int get_cmdvec (char *cmd, vector *v)
 {
 	int i;
 	int r = 0;
@@ -319,7 +318,7 @@ out:
 }
 
 static uint64_t
-fingerprint(vector vec)
+fingerprint(const struct _vector *vec)
 {
 	int i;
 	uint64_t fp = 0;
@@ -334,6 +333,11 @@ fingerprint(vector vec)
 	return fp;
 }
 
+struct handler *find_handler_for_cmdvec(const struct _vector *v)
+{
+	return find_handler(fingerprint(v));
+}
+
 int
 alloc_handlers (void)
 {
@@ -412,8 +416,7 @@ do_genhelp(struct strbuf *reply, const char *cmd, int error) {
 }
 
 
-static char *
-genhelp_handler (const char *cmd, int error)
+char *genhelp_handler(const char *cmd, int error)
 {
 	STRBUF_ON_STACK(reply);
 
@@ -422,67 +425,6 @@ genhelp_handler (const char *cmd, int error)
 	return steal_strbuf_str(&reply);
 }
 
-int
-parse_cmd (char * cmd, char ** reply, int * len, void * data, int timeout )
-{
-	int r;
-	struct handler * h;
-	vector cmdvec = NULL;
-	struct timespec tmo;
-
-	r = get_cmdvec(cmd, &cmdvec);
-
-	if (r) {
-		*reply = genhelp_handler(cmd, r);
-		if (*reply == NULL)
-			return EINVAL;
-		*len = strlen(*reply) + 1;
-		return 0;
-	}
-
-	h = find_handler(fingerprint(cmdvec));
-
-	if (!h || !h->fn) {
-		free_keys(cmdvec);
-		*reply = genhelp_handler(cmd, EINVAL);
-		if (*reply == NULL)
-			return EINVAL;
-		*len = strlen(*reply) + 1;
-		return 0;
-	}
-
-	/*
-	 * execute handler
-	 */
-	if (clock_gettime(CLOCK_REALTIME, &tmo) == 0) {
-		tmo.tv_sec += timeout;
-	} else {
-		tmo.tv_sec = 0;
-	}
-	if (h->locked) {
-		int locked = 0;
-		struct vectors * vecs = (struct vectors *)data;
-
-		pthread_cleanup_push(cleanup_lock, &vecs->lock);
-		if (tmo.tv_sec) {
-			r = timedlock(&vecs->lock, &tmo);
-		} else {
-			lock(&vecs->lock);
-			r = 0;
-		}
-		if (r == 0) {
-			locked = 1;
-			pthread_testcancel();
-			r = h->fn(cmdvec, reply, len, data);
-		}
-		pthread_cleanup_pop(locked);
-	} else
-		r = h->fn(cmdvec, reply, len, data);
-	free_keys(cmdvec);
-
-	return r;
-}
-
 char *
 get_keyparam (vector v, uint64_t code)
 {
diff --git a/multipathd/cli.h b/multipathd/cli.h
index 07fd61b..7ca9b2f 100644
--- a/multipathd/cli.h
+++ b/multipathd/cli.h
@@ -137,7 +137,10 @@ int __set_handler_callback (uint64_t fp, cli_handler *fn, bool locked);
 #define set_handler_callback(fp, fn) __set_handler_callback(fp, fn, true)
 #define set_unlocked_handler_callback(fp, fn) __set_handler_callback(fp, fn, false)
 
-int parse_cmd (char * cmd, char ** reply, int * len, void *, int);
+int get_cmdvec (char *cmd, vector *v);
+struct handler *find_handler_for_cmdvec(const struct _vector *v);
+char *genhelp_handler (const char *cmd, int error);
+
 int load_keys (void);
 char * get_keyparam (vector v, uint64_t code);
 void free_keys (vector vec);
diff --git a/multipathd/uxlsnr.c b/multipathd/uxlsnr.c
index 449f149..99fee16 100644
--- a/multipathd/uxlsnr.c
+++ b/multipathd/uxlsnr.c
@@ -311,6 +311,67 @@ static void handle_inotify(int fd, struct watch_descriptors *wds)
 		condlog(1, "Multipath configuration updated.\nReload multipathd for changes to take effect");
 }
 
+static int parse_cmd (char *cmd, char **reply, int *len, void *data,
+		      int timeout)
+{
+	int r;
+	struct handler * h;
+	vector cmdvec = NULL;
+	struct timespec tmo;
+
+	r = get_cmdvec(cmd, &cmdvec);
+
+	if (r) {
+		*reply = genhelp_handler(cmd, r);
+		if (*reply == NULL)
+			return EINVAL;
+		*len = strlen(*reply) + 1;
+		return 0;
+	}
+
+	h = find_handler_for_cmdvec(cmdvec);
+
+	if (!h || !h->fn) {
+		free_keys(cmdvec);
+		*reply = genhelp_handler(cmd, EINVAL);
+		if (*reply == NULL)
+			return EINVAL;
+		*len = strlen(*reply) + 1;
+		return 0;
+	}
+
+	/*
+	 * execute handler
+	 */
+	if (clock_gettime(CLOCK_REALTIME, &tmo) == 0) {
+		tmo.tv_sec += timeout;
+	} else {
+		tmo.tv_sec = 0;
+	}
+	if (h->locked) {
+		int locked = 0;
+		struct vectors * vecs = (struct vectors *)data;
+
+		pthread_cleanup_push(cleanup_lock, &vecs->lock);
+		if (tmo.tv_sec) {
+			r = timedlock(&vecs->lock, &tmo);
+		} else {
+			lock(&vecs->lock);
+			r = 0;
+		}
+		if (r == 0) {
+			locked = 1;
+			pthread_testcancel();
+			r = h->fn(cmdvec, reply, len, data);
+		}
+		pthread_cleanup_pop(locked);
+	} else
+		r = h->fn(cmdvec, reply, len, data);
+	free_keys(cmdvec);
+
+	return r;
+}
+
 static int uxsock_trigger(char *str, char **reply, int *len,
 			  bool is_root, void *trigger_data)
 {
-- 
2.33.1


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