[net-next,08/12] tools: bpftool: add JSON output for `bpftool batch file FILE` command

Message ID 20171023162416.32753-9-jakub.kicinski@netronome.com
State Accepted
Delegated to: David Miller
Headers show
Series
  • tools: bpftool: Add JSON output to bpftool
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Commit Message

Jakub Kicinski Oct. 23, 2017, 4:24 p.m.
From: Quentin Monnet <quentin.monnet@netronome.com>

`bpftool batch file FILE` takes FILE as an argument and executes all the
bpftool commands it finds inside (or stops if an error occurs).

To obtain a consistent JSON output, create a root JSON array, then for
each command create a new object containing two fields: one with the
command arguments, the other with the output (which is the JSON object
that the command would have produced, if called on its own).

Signed-off-by: Quentin Monnet <quentin.monnet@netronome.com>
---
 tools/bpf/bpftool/main.c | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

Comments

Daniel Borkmann Oct. 23, 2017, 8:32 p.m. | #1
On 10/23/2017 06:24 PM, Jakub Kicinski wrote:
> From: Quentin Monnet <quentin.monnet@netronome.com>
>
> `bpftool batch file FILE` takes FILE as an argument and executes all the
> bpftool commands it finds inside (or stops if an error occurs).
>
> To obtain a consistent JSON output, create a root JSON array, then for
> each command create a new object containing two fields: one with the
> command arguments, the other with the output (which is the JSON object
> that the command would have produced, if called on its own).
>
> Signed-off-by: Quentin Monnet <quentin.monnet@netronome.com>

Acked-by: Daniel Borkmann <daniel@iogearbox.net>

Patch

diff --git a/tools/bpf/bpftool/main.c b/tools/bpf/bpftool/main.c
index 14bfc17cd4de..71b01bf73912 100644
--- a/tools/bpf/bpftool/main.c
+++ b/tools/bpf/bpftool/main.c
@@ -155,6 +155,7 @@  static int do_batch(int argc, char **argv)
 	int n_argc;
 	FILE *fp;
 	int err;
+	int i;
 
 	if (argc < 2) {
 		err("too few parameters for batch\n");
@@ -174,6 +175,8 @@  static int do_batch(int argc, char **argv)
 		return -1;
 	}
 
+	if (json_output)
+		jsonw_start_array(json_wtr);
 	while (fgets(buf, sizeof(buf), fp)) {
 		if (strlen(buf) == sizeof(buf) - 1) {
 			errno = E2BIG;
@@ -197,7 +200,21 @@  static int do_batch(int argc, char **argv)
 		if (!n_argc)
 			continue;
 
+		if (json_output) {
+			jsonw_start_object(json_wtr);
+			jsonw_name(json_wtr, "command");
+			jsonw_start_array(json_wtr);
+			for (i = 0; i < n_argc; i++)
+				jsonw_string(json_wtr, n_argv[i]);
+			jsonw_end_array(json_wtr);
+			jsonw_name(json_wtr, "output");
+		}
+
 		err = cmd_select(cmds, n_argc, n_argv, do_help);
+
+		if (json_output)
+			jsonw_end_object(json_wtr);
+
 		if (err)
 			goto err_close;
 
@@ -214,6 +231,9 @@  static int do_batch(int argc, char **argv)
 err_close:
 	fclose(fp);
 
+	if (json_output)
+		jsonw_end_array(json_wtr);
+
 	return err;
 }