netdev - [RFC] iproute2: add json output to nstat

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Date:	Fri, 13 Sep 2013 10:35:19 -0700
From:	Stephen Hemminger <stephen@...workplumber.org>
To:	netdev@...r.kernel.org
Subject: [RFC] iproute2: add json output to nstat

New command line flag to output statistics in JSON format.
In our envrionment, we have scripts that parse output of commands.
It is better to use a format supported by existing parsers.

If this is popular, will add similar flags to ip and tc commands.

---
 misc/nstat.c |   46 ++++++++++++++++++++++++++++++++++++++++------
 1 file changed, 40 insertions(+), 6 deletions(-)

diff --git a/misc/nstat.c b/misc/nstat.c
index b685978..5a4cfe9 100644
--- a/misc/nstat.c
+++ b/misc/nstat.c
@@ -33,6 +33,7 @@ int dump_zeros = 0;
 int reset_history = 0;
 int ignore_history = 0;
 int no_output = 0;
+int json_output = 0;
 int no_update = 0;
 int scan_interval = 0;
 int time_constant = 0;
@@ -255,11 +256,17 @@ static void load_netstat(void)
 	}
 }
 
+
 static void dump_kern_db(FILE *fp, int to_hist)
 {
 	struct nstat_ent *n, *h;
+	const char *eol = "\n";
+
 	h = hist_db;
-	fprintf(fp, "#%s\n", info_source);
+	if (json_output)
+		fprintf(fp, "{ \"%s\": [", info_source);
+	else
+		fprintf(fp, "#%s\n", info_source);
 	for (n=kern_db; n; n=n->next) {
 		unsigned long long val = n->val;
 		if (!dump_zeros && !val && !n->rate)
@@ -276,15 +283,30 @@ static void dump_kern_db(FILE *fp, int to_hist)
 				}
 			}
 		}
-		fprintf(fp, "%-32s%-16llu%6.1f\n", n->id, val, n->rate);
+
+		if (json_output) {
+			fprintf(fp, "%s    { \"id\":\"%s\", \"val\":%llu,"
+				" \"rate\":%.1f }",
+				eol, n->id, val, n->rate);
+			eol = ",\n";
+		} else
+			fprintf(fp, "%-32s%-16llu%6.1f\n", n->id, val, n->rate);
 	}
+	if (json_output)
+		fprintf(fp, "\n] }\n");
 }
 
 static void dump_incr_db(FILE *fp)
 {
 	struct nstat_ent *n, *h;
+	const char *eol = "\n";
+
 	h = hist_db;
-	fprintf(fp, "#%s\n", info_source);
+	if (json_output)
+		fprintf(fp, "{ \"%s\": [", info_source);
+	else
+		fprintf(fp, "#%s\n", info_source);
+
 	for (n=kern_db; n; n=n->next) {
 		int ovfl = 0;
 		unsigned long long val = n->val;
@@ -304,9 +326,18 @@ static void dump_incr_db(FILE *fp)
 			continue;
 		if (!match(n->id))
 			continue;
-		fprintf(fp, "%-32s%-16llu%6.1f%s\n", n->id, val,
-			n->rate, ovfl?" (overflow)":"");
+
+		if (json_output) {
+			fprintf(fp, "%s    { \"id\":\"%s\", \"val\":%llu,"
+				" \"rate\":%.1f, \"overflow\":%d }",
+				eol, n->id, val, n->rate, ovfl);
+			eol = ",\n";
+		} else
+			fprintf(fp, "%-32s%-16llu%6.1f%s\n", n->id, val,
+				n->rate, ovfl?" (overflow)":"");
 	}
+	if (json_output)
+		fprintf(fp, "\n] }\n");
 }
 
 static int children;
@@ -451,7 +482,7 @@ int main(int argc, char *argv[])
 	int ch;
 	int fd;
 
-	while ((ch = getopt(argc, argv, "h?vVzrnasd:t:")) != EOF) {
+	while ((ch = getopt(argc, argv, "h?vVzrnasd:t:j")) != EOF) {
 		switch(ch) {
 		case 'z':
 			dump_zeros = 1;
@@ -478,6 +509,9 @@ int main(int argc, char *argv[])
 				exit(-1);
 			}
 			break;
+		case 'j':
+			json_output = 1;
+			break;
 		case 'v':
 		case 'V':
 			printf("nstat utility, iproute2-ss%s\n", SNAPSHOT);
-- 
1.7.10.4

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