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Date: Thu, 5 Apr 2018 18:23:14 +0300
From: Viktor Prutyanov <viktor.prutyanov@...tuozzo.com>
To: linux-ext4@...r.kernel.org
Cc: Theodore Ts'o <tytso@....edu>,
Dmitry Monakhov <dmonakhov@...nvz.org>
Subject: Re: [PATCH v3 1/5] libsupport: add JSON output helpers
On Tue, 20 Feb 2018 12:59:46 +0300
Viktor Prutyanov <viktor.prutyanov@...tuozzo.com> wrote:
ping
> This patch adds JSON objects and lists and methods to print them
>
> Signed-off-by: Viktor Prutyanov <viktor.prutyanov@...tuozzo.com>
> ---
> lib/support/Makefile.in | 7 +-
> lib/support/json-out.c | 326
> ++++++++++++++++++++++++++++++++++++++++++++++++
> lib/support/json-out.h | 69 ++++++++++ misc/dumpe2fs.c |
> 17 ++- 4 files changed, 416 insertions(+), 3 deletions(-)
> create mode 100644 lib/support/json-out.c
> create mode 100644 lib/support/json-out.h
>
> diff --git a/lib/support/Makefile.in b/lib/support/Makefile.in
> index 40206b74..42fa3324 100644
> --- a/lib/support/Makefile.in
> +++ b/lib/support/Makefile.in
> @@ -22,7 +22,8 @@ OBJS= cstring.o \
> quotaio.o \
> quotaio_v2.o \
> quotaio_tree.o \
> - dict.o
> + dict.o \
> + json-out.o
>
> SRCS= $(srcdir)/argv_parse.c \
> $(srcdir)/cstring.c \
> @@ -35,7 +36,8 @@ SRCS= $(srcdir)/argv_parse.c \
> $(srcdir)/quotaio.c \
> $(srcdir)/quotaio_tree.c \
> $(srcdir)/quotaio_v2.c \
> - $(srcdir)/dict.c
> + $(srcdir)/dict.c \
> + $(srcdir)/json-out.c
>
> LIBRARY= libsupport
> LIBDIR= support
> @@ -165,3 +167,4 @@ quotaio_v2.o: $(srcdir)/quotaio_v2.c
> $(top_builddir)/lib/config.h \ $(srcdir)/dqblk_v2.h
> $(srcdir)/quotaio_tree.h dict.o: $(srcdir)/dict.c
> $(top_builddir)/lib/config.h \ $(top_builddir)/lib/dirpaths.h
> $(srcdir)/dict.h +json-out.o: $(srcdir)/json-out.c
> $(srcdir)/json-out.h diff --git a/lib/support/json-out.c
> b/lib/support/json-out.c new file mode 100644
> index 00000000..8c822f35
> --- /dev/null
> +++ b/lib/support/json-out.c
> @@ -0,0 +1,326 @@
> +/*
> + * json-out.c -- JSON output
> + *
> + * Copyright (c) 2018 Virtuozzo International GmbH
> + *
> + * %Begin-Header%
> + * This file may be redistributed under the terms of the GNU Public
> + * License.
> + * %End-Header%
> + */
> +
> +#include <stdio.h>
> +#include <string.h>
> +#include <stdlib.h>
> +#include <stdarg.h>
> +
> +#include "json-out.h"
> +
> +static void *xmalloc(size_t size)
> +{
> + void *p = malloc(size);
> +
> + if (!p)
> + exit(1);
> +
> + return p;
> +}
> +
> +static void *xstrdup(const char *str)
> +{
> + size_t size = strlen(str) + 1;
> + char *p = xmalloc(size);
> +
> + return strcpy(p, str);
> +}
> +
> +struct json_list *json_list_create(enum json_val_type type)
> +{
> + struct json_list *list = xmalloc(sizeof(struct json_list));
> +
> + list->node = NULL;
> + list->type = type;
> +
> + return list;
> +}
> +
> +struct json_list *json_list_create_in_obj(struct json_obj
> *parent_obj, char *key, enum json_val_type type) +{
> + struct json_list *list = json_list_create(type);
> +
> + json_obj_add_list(parent_obj, key, list);
> +
> + return list;
> +}
> +
> +void json_list_delete(struct json_list *list)
> +{
> + struct json_list_node *node = list->node, *next;
> +
> + while (node) {
> + switch (list->type) {
> + case JSON_VAL_STRING:
> + free(node->val.str);
> + break;
> + case JSON_VAL_LIST:
> + json_list_delete(node->val.list);
> + break;
> + case JSON_VAL_OBJECT:
> + json_obj_delete(node->val.obj);
> + break;
> + default:
> + break;
> + }
> + next = node->next;
> + free(node);
> + node = next;
> + }
> + free(list);
> +}
> +
> +struct json_obj *json_obj_create(void)
> +{
> + struct json_obj *obj = xmalloc(sizeof(struct json_obj));
> +
> + obj->pair = NULL;
> +
> + return obj;
> +}
> +
> +struct json_obj *json_obj_create_in_obj(struct json_obj *parent_obj,
> char *key) +{
> + struct json_obj *obj = json_obj_create();
> +
> + json_obj_add_obj(parent_obj, key, obj);
> +
> + return obj;
> +}
> +
> +static void json_pair_delete(struct json_pair *pair)
> +{
> + switch (pair->type)
> + {
> + case JSON_VAL_STRING:
> + free(pair->val.str);
> + break;
> + case JSON_VAL_LIST:
> + json_list_delete(pair->val.list);
> + break;
> + case JSON_VAL_OBJECT:
> + json_obj_delete(pair->val.obj);
> + break;
> + default:
> + break;
> + }
> + free(pair->key);
> + free(pair);
> +}
> +
> +void json_obj_delete(struct json_obj *obj)
> +{
> + struct json_pair *pair = obj->pair, *next;
> +
> + while (pair) {
> + next = pair->next;
> + json_pair_delete(pair);
> + pair = next;
> + }
> + free(obj);
> +}
> +
> +void json_obj_delete_pair(struct json_obj *obj, char *key)
> +{
> + struct json_pair *pair = obj->pair, *next, *prev = NULL;
> +
> + while (pair) {
> + next = pair->next;
> + if (!strcmp(pair->key, key)) {
> + json_pair_delete(pair);
> + if (prev)
> + prev->next = next;
> + else
> + obj->pair = next;
> + break;
> + }
> + prev = pair;
> + pair = next;
> + }
> +}
> +
> +static struct json_list_node *json_list_add_node(struct json_list
> *list) +{
> + struct json_list_node *new_node = xmalloc(sizeof(struct
> json_list_node)); +
> + new_node->next = NULL;
> +
> + if (list->node) {
> + struct json_list_node *node;
> +
> + for (node = list->node; node && node->next; node =
> node->next);
> + node->next = new_node;
> + } else
> + list->node = new_node;
> +
> + return new_node;
> +}
> +
> +void json_list_add_str(struct json_list *list, const char *str)
> +{
> + struct json_list_node *new_node = json_list_add_node(list);
> +
> + new_node->val.str = xstrdup(str);
> +}
> +
> +void json_list_add_obj(struct json_list *list, struct json_obj *obj)
> +{
> + struct json_list_node *new_node = json_list_add_node(list);
> +
> + new_node->val.obj = obj;
> +}
> +
> +static struct json_pair *json_obj_add_pair(struct json_obj *obj,
> const char *key, enum json_val_type type) +{
> + struct json_pair *new_pair = xmalloc(sizeof(struct
> json_pair));
> + new_pair->key = xstrdup(key);
> + new_pair->next = NULL;
> + new_pair->type = type;
> +
> + if (obj->pair) {
> + struct json_pair *pair;
> +
> + for (pair = obj->pair; pair && pair->next; pair =
> pair->next);
> + pair->next = new_pair;
> + } else
> + obj->pair = new_pair;
> +
> + return new_pair;
> +}
> +
> +void json_obj_add_str(struct json_obj *obj, const char *key, const
> char *str) +{
> + struct json_pair *new_pair = json_obj_add_pair(obj, key,
> JSON_VAL_STRING); +
> + new_pair->val.str = xstrdup(str);
> +}
> +
> +void json_obj_add_fmt_buf_str(struct json_obj *obj, const char *key,
> char *buf, size_t size, const char *fmt, ...) +{
> + va_list ap;
> +
> + va_start(ap, fmt);
> + vsnprintf(buf, size, fmt, ap);
> + va_end(ap);
> +
> + json_obj_add_str(obj, key, buf);
> +}
> +
> +void json_obj_add_fmt_str(struct json_obj *obj, const char *key,
> size_t size, const char *fmt, ...) +{
> + va_list ap;
> + char *buf = malloc(size);
> +
> + va_start(ap, fmt);
> + vsnprintf(buf, size, fmt, ap);
> + va_end(ap);
> +
> + json_obj_add_str(obj, key, buf);
> + free(buf);
> +}
> +
> +void json_obj_add_list(struct json_obj *obj, const char *key, struct
> json_list *list) +{
> + struct json_pair *new_pair = json_obj_add_pair(obj, key,
> JSON_VAL_LIST); +
> + new_pair->val.list = list;
> +}
> +
> +void json_obj_add_obj(struct json_obj *obj, const char *key, struct
> json_obj *new_obj) +{
> + struct json_pair *new_pair = json_obj_add_pair(obj, key,
> JSON_VAL_OBJECT); +
> + new_pair->val.obj = new_obj;
> +}
> +
> +static void json_pair_print_json(struct json_pair *pair, int
> ind_lvl); +static void json_list_node_print_json(struct
> json_list_node *node, enum json_val_type type, int ind_lvl); +
> +static void
> +print_ind(int ind_lvl)
> +{
> + int i;
> +
> + putchar('\n');
> + for (i = 0; i < ind_lvl; i++)
> + fputs(" ", stdout);
> +}
> +
> +void json_obj_print_json(struct json_obj *obj, int ind_lvl)
> +{
> + struct json_pair *pair;
> +
> + printf("{");
> + for (pair = obj->pair; pair; pair = pair->next) {
> + json_pair_print_json(pair, ind_lvl+1);
> + if (pair->next)
> + printf(", ");
> + }
> + if (obj->pair) /* Do not indent if object was empty */
> + print_ind(ind_lvl);
> + printf("}");
> +}
> +
> +void json_list_print_json(struct json_list *list, int ind_lvl)
> +{
> + struct json_list_node *node;
> +
> + printf("[");
> + for (node = list->node; node; node = node->next) {
> + json_list_node_print_json(node, list->type,
> ind_lvl+1);
> + if (node->next)
> + printf(", ");
> + }
> + if (list->node) /* Do not indent if list was empty */
> + print_ind(ind_lvl);
> + printf("]");
> +}
> +
> +static void
> +json_list_node_print_json(struct json_list_node *node, enum
> json_val_type type, int ind_lvl) +{
> + print_ind(ind_lvl);
> + switch (type) {
> + case JSON_VAL_STRING:
> + printf("\"%s\"", node->val.str);
> + break;
> + case JSON_VAL_LIST:
> + json_list_print_json(node->val.list, ind_lvl);
> + break;
> + case JSON_VAL_OBJECT:
> + json_obj_print_json(node->val.obj, ind_lvl);
> + break;
> + case JSON_VAL_FLAG:
> + printf("%s", node->val.flag ? "true" : "false");
> + break;
> + default:
> + break;
> + }
> +}
> +
> +static void json_pair_print_json(struct json_pair *pair, int ind_lvl)
> +{
> + print_ind(ind_lvl);
> + printf("\"%s\": ", pair->key);
> + switch (pair->type) {
> + case JSON_VAL_STRING:
> + printf("\"%s\"", pair->val.str);
> + break;
> + case JSON_VAL_LIST:
> + json_list_print_json(pair->val.list, ind_lvl);
> + break;
> + case JSON_VAL_OBJECT:
> + json_obj_print_json(pair->val.obj, ind_lvl);
> + break;
> + default:
> + break;
> + }
> +}
> diff --git a/lib/support/json-out.h b/lib/support/json-out.h
> new file mode 100644
> index 00000000..0132bd2c
> --- /dev/null
> +++ b/lib/support/json-out.h
> @@ -0,0 +1,69 @@
> +/*
> + * json-out.h -- JSON output
> + *
> + * Copyright (c) 2018 Virtuozzo International GmbH
> + *
> + * %Begin-Header%
> + * This file may be redistributed under the terms of the GNU Public
> + * License.
> + * %End-Header%
> + */
> +
> +#ifndef H_JSON_OUT
> +#define H_JSON_OUT
> +
> +enum json_val_type {
> + JSON_VAL_STRING,
> + JSON_VAL_OBJECT,
> + JSON_VAL_LIST,
> + JSON_VAL_FLAG
> +};
> +
> +struct json_obj {
> + struct json_pair *pair;
> +};
> +
> +union json_val {
> + char *str;
> + struct json_obj *obj;
> + struct json_list *list;
> + char flag;
> +};
> +
> +struct json_pair {
> + char *key;
> + enum json_val_type type;
> + union json_val val;
> + struct json_pair *next;
> +};
> +
> +struct json_list {
> + enum json_val_type type;
> + struct json_list_node *node;
> +};
> +
> +struct json_list_node {
> + union json_val val;
> + struct json_list_node *next;
> +};
> +
> +struct json_obj *json_obj_create(void);
> +struct json_obj *json_obj_create_in_obj(struct json_obj *parent_obj,
> char *key); +void json_obj_add_str(struct json_obj *obj, const char
> *key, const char *str); +void json_obj_add_list(struct json_obj *obj,
> const char *key, struct json_list *list); +void
> json_obj_add_obj(struct json_obj *obj, const char *key, struct
> json_obj *new_obj); +void json_obj_add_flag(struct json_obj *obj,
> const char *key, char flag); +void json_obj_add_fmt_str(struct
> json_obj *obj, const char *key, size_t size, const char *fmt, ...);
> +void json_obj_add_fmt_buf_str(struct json_obj *obj, const char *key,
> char *buf, size_t size, const char *fmt, ...); +void
> json_obj_print_json(struct json_obj *obj, int ind_lvl); +void
> json_obj_delete_pair(struct json_obj *obj, char *key); +void
> json_obj_delete(struct json_obj *obj); + +struct json_list
> *json_list_create(enum json_val_type type); +struct json_list
> *json_list_create_in_obj(struct json_obj *parent_obj, char *key, enum
> json_val_type type); +void json_list_add_str(struct json_list *list,
> const char *str); +void json_list_add_obj(struct json_list *list,
> struct json_obj *obj); +void json_list_print_json(struct json_list
> *list, int ind_lvl); +void json_list_delete(struct json_list *list);
> + +#endif diff --git a/misc/dumpe2fs.c b/misc/dumpe2fs.c
> index 395ea9ee..ca9953a1 100644
> --- a/misc/dumpe2fs.c
> +++ b/misc/dumpe2fs.c
> @@ -607,7 +607,12 @@ try_open_again:
> goto just_descriptors;
> list_super (fs->super);
> if (ext2fs_has_feature_journal_dev(fs->super)) {
> - print_journal_information(fs);
> + print_journal_information(fs, dump_obj);
> + if (json) {
> + json_obj_print_json(dump_obj, 0);
> + putchar('\n');
> + json_obj_delete(dump_obj);
> + }
> ext2fs_close_free(&fs);
> exit(0);
> }
> @@ -616,6 +621,11 @@ try_open_again:
> print_inline_journal_information(fs);
> list_bad_blocks(fs, 0);
> if (header_only) {
> + if (json) {
> + json_obj_print_json(dump_obj, 0);
> + putchar('\n');
> + json_obj_delete(dump_obj);
> + }
> ext2fs_close_free(&fs);
> exit (0);
> }
> @@ -636,6 +646,11 @@ just_descriptors:
> error_message(retval));
> }
> }
> + if (json) {
> + json_obj_print_json(dump_obj, 0);
> + putchar('\n');
> + json_obj_delete(dump_obj);
> + }
> ext2fs_close_free(&fs);
> remove_error_table(&et_ext2_error_table);
> exit (0);
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