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Date: Tue, 31 May 2016 11:56:43 -0700
From: Stephen Hemminger <stephen@...workplumber.org>
To: Roopa Prabhu <roopa@...ulusnetworks.com>
Cc: netdev@...r.kernel.org, anuradhak@...ulusnetworks.com,
nikolay@...ulusnetworks.com, julien@...ulusnetworks.com
Subject: Re: [PATCH iproute2 net-next 1/5] json_writer: allow base json data
type to be array or object
On Fri, 27 May 2016 21:37:12 -0700
Roopa Prabhu <roopa@...ulusnetworks.com> wrote:
> From: Anuradha Karuppiah <anuradhak@...ulusnetworks.com>
>
> This patch adds a type qualifier to json_writer. Type can be a
> json object or array. This can be extended to other types like
> json-string, json-number etc in the future.
>
> Signed-off-by: Anuradha Karuppiah <anuradhak@...ulusnetworks.com>
> ---
> include/json_writer.h | 5 +++--
> lib/json_writer.c | 39 +++++++++++++++++++++++++++++++++++----
> misc/ifstat.c | 6 +++---
> misc/lnstat.c | 2 +-
> misc/nstat.c | 4 ++--
> 5 files changed, 44 insertions(+), 12 deletions(-)
>
> diff --git a/include/json_writer.h b/include/json_writer.h
> index ab9a008..e04a40a 100644
> --- a/include/json_writer.h
> +++ b/include/json_writer.h
> @@ -21,8 +21,9 @@
> /* Opaque class structure */
> typedef struct json_writer json_writer_t;
>
> -/* Create a new JSON stream */
> -json_writer_t *jsonw_new(FILE *f);
> +/* Create a new JSON stream with data type */
> +json_writer_t *jsonw_new_object(FILE *f);
> +json_writer_t *jsonw_new_array(FILE *f);
> /* End output to JSON stream */
> void jsonw_destroy(json_writer_t **self_p);
>
> diff --git a/lib/json_writer.c b/lib/json_writer.c
> index 2af16e1..420cd87 100644
> --- a/lib/json_writer.c
> +++ b/lib/json_writer.c
> @@ -22,11 +22,17 @@
>
> #include "json_writer.h"
>
> +enum jsonw_data_type {
> + JSONW_TYPE_OBJECT,
> + JSONW_TYPE_ARRAY
> +};
> +
> struct json_writer {
> FILE *out; /* output file */
> unsigned depth; /* nesting */
> bool pretty; /* optional whitepace */
> char sep; /* either nul or comma */
> + int type; /* currently either object or array */
> };
>
> /* indentation for pretty print */
> @@ -94,7 +100,7 @@ static void jsonw_puts(json_writer_t *self, const char *str)
> }
>
> /* Create a new JSON stream */
> -json_writer_t *jsonw_new(FILE *f)
> +static json_writer_t *jsonw_new(FILE *f, int type)
> {
> json_writer_t *self = malloc(sizeof(*self));
> if (self) {
> @@ -102,11 +108,29 @@ json_writer_t *jsonw_new(FILE *f)
> self->depth = 0;
> self->pretty = false;
> self->sep = '\0';
> - putc('{', self->out);
> + self->type = type;
> + switch (self->type) {
> + case JSONW_TYPE_OBJECT:
> + putc('{', self->out);
> + break;
> + case JSONW_TYPE_ARRAY:
> + putc('[', self->out);
> + break;
> + }
> }
> return self;
> }
>
> +json_writer_t *jsonw_new_object(FILE *f)
> +{
> + return jsonw_new(f, JSONW_TYPE_OBJECT);
> +}
> +
> +json_writer_t *jsonw_new_array(FILE *f)
> +{
> + return jsonw_new(f, JSONW_TYPE_ARRAY);
> +}
> +
> /* End output to JSON stream */
> void jsonw_destroy(json_writer_t **self_p)
> {
> @@ -114,7 +138,14 @@ void jsonw_destroy(json_writer_t **self_p)
>
> assert(self->depth == 0);
> jsonw_eol(self);
> - fputs("}\n", self->out);
> + switch (self->type) {
> + case JSONW_TYPE_OBJECT:
> + fputs("}\n", self->out);
> + break;
> + case JSONW_TYPE_ARRAY:
> + fputs("]\n", self->out);
> + break;
> + }
> fflush(self->out);
> free(self);
> *self_p = NULL;
> @@ -267,7 +298,7 @@ void jsonw_null_field(json_writer_t *self, const char *prop)
> #ifdef TEST
> int main(int argc, char **argv)
> {
> - json_writer_t *wr = jsonw_new(stdout);
> + json_writer_t *wr = jsonw_new_object(stdout);
>
> jsonw_pretty(wr, true);
> jsonw_name(wr, "Vyatta");
> diff --git a/misc/ifstat.c b/misc/ifstat.c
> index abbb4e7..29aa63c 100644
> --- a/misc/ifstat.c
> +++ b/misc/ifstat.c
> @@ -240,7 +240,7 @@ static void load_raw_table(FILE *fp)
>
> static void dump_raw_db(FILE *fp, int to_hist)
> {
> - json_writer_t *jw = json_output ? jsonw_new(fp) : NULL;
> + json_writer_t *jw = json_output ? jsonw_new_object(fp) : NULL;
> struct ifstat_ent *n, *h;
>
> h = hist_db;
> @@ -447,7 +447,7 @@ static void print_one_if(FILE *fp, const struct ifstat_ent *n,
>
> static void dump_kern_db(FILE *fp)
> {
> - json_writer_t *jw = json_output ? jsonw_new(fp) : NULL;
> + json_writer_t *jw = json_output ? jsonw_new_object(fp) : NULL;
> struct ifstat_ent *n;
>
> if (jw) {
> @@ -473,7 +473,7 @@ static void dump_kern_db(FILE *fp)
> static void dump_incr_db(FILE *fp)
> {
> struct ifstat_ent *n, *h;
> - json_writer_t *jw = json_output ? jsonw_new(fp) : NULL;
> + json_writer_t *jw = json_output ? jsonw_new_object(fp) : NULL;
>
> h = hist_db;
> if (jw) {
> diff --git a/misc/lnstat.c b/misc/lnstat.c
> index 659a01b..2988e9e 100644
> --- a/misc/lnstat.c
> +++ b/misc/lnstat.c
> @@ -110,7 +110,7 @@ static void print_line(FILE *of, const struct lnstat_file *lnstat_files,
> static void print_json(FILE *of, const struct lnstat_file *lnstat_files,
> const struct field_params *fp)
> {
> - json_writer_t *jw = jsonw_new(of);
> + json_writer_t *jw = jsonw_new_object(of);
> int i;
>
> jsonw_start_object(jw);
> diff --git a/misc/nstat.c b/misc/nstat.c
> index a9e0f20..7ca6204 100644
> --- a/misc/nstat.c
> +++ b/misc/nstat.c
> @@ -279,7 +279,7 @@ static void load_netstat(void)
>
> static void dump_kern_db(FILE *fp, int to_hist)
> {
> - json_writer_t *jw = json_output ? jsonw_new(fp) : NULL;
> + json_writer_t *jw = json_output ? jsonw_new_object(fp) : NULL;
> struct nstat_ent *n, *h;
>
> h = hist_db;
> @@ -323,7 +323,7 @@ static void dump_kern_db(FILE *fp, int to_hist)
>
> static void dump_incr_db(FILE *fp)
> {
> - json_writer_t *jw = json_output ? jsonw_new(fp) : NULL;
> + json_writer_t *jw = json_output ? jsonw_new_object(fp) : NULL;
> struct nstat_ent *n, *h;
>
> h = hist_db;
I would prefer that this not be done.
Why not make everything an an object.
It adds more code and makes it different from how the Java version works.
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