Patchwork [v5,3/6] block/qapi: Human-readable ImageInfoSpecific dump

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Submitter Max Reitz
Date Sept. 23, 2013, 12:09 p.m.
Message ID <1379938162-14005-4-git-send-email-mreitz@redhat.com>
Download mbox | patch
Permalink /patch/277163/
State New
Headers show

Comments

Max Reitz - Sept. 23, 2013, 12:09 p.m.
Add a function for generically dumping the ImageInfoSpecific information
in a human-readable format to block/qapi.c.

Use this function in bdrv_image_info_dump and qemu-io-cmds.c:info_f to
allow qemu-img info resp. qemu-io -c info to print that format specific
information.

Signed-off-by: Max Reitz <mreitz@redhat.com>
---
 block/qapi.c         | 121 +++++++++++++++++++++++++++++++++++++++++++++++++++
 include/block/qapi.h |   2 +
 qemu-io-cmds.c       |   9 ++++
 3 files changed, 132 insertions(+)
Eric Blake - Sept. 30, 2013, 4:18 p.m.
On 09/23/2013 06:09 AM, Max Reitz wrote:
> Add a function for generically dumping the ImageInfoSpecific information
> in a human-readable format to block/qapi.c.
> 
> Use this function in bdrv_image_info_dump and qemu-io-cmds.c:info_f to
> allow qemu-img info resp. qemu-io -c info to print that format specific
> information.
> 
> Signed-off-by: Max Reitz <mreitz@redhat.com>
> ---
>  block/qapi.c         | 121 +++++++++++++++++++++++++++++++++++++++++++++++++++
>  include/block/qapi.h |   2 +
>  qemu-io-cmds.c       |   9 ++++
>  3 files changed, 132 insertions(+)
> 

> +
> +static void dump_qdict(fprintf_function func_fprintf, void *f, int indentation,
> +                       QDict *dict)
> +{
> +    const QDictEntry *entry;
> +
> +    for (entry = qdict_first(dict); entry; entry = qdict_next(dict, entry)) {
> +        qtype_code type = qobject_type(entry->value);
> +        bool composite = (type == QTYPE_QDICT || type == QTYPE_QLIST);
> +        const char *format = composite ? "%*s%s:\n" : "%*s%s: ";
> +        char key[strlen(entry->key) + 1];
> +        int i;
> +
> +        /* replace dashes with spaces in key (variable) names */
> +        for (i = 0; entry->key[i]; i++) {
> +            key[i] = entry->key[i] == '-' ? ' ' : entry->key[i];

I wonder if this should replace underscores, too.  For now, this
function is only being used on types that happen to use - in key names,
but it seems generic enough that we may want to use it on older types
that followed older conventions.  But I won't force a respin for just
that (if someone DOES reuse this function in the future, they can tweak
underscores at that time, if you don't do it now).

Reviewed-by: Eric Blake <eblake@redhat.com>

Patch

diff --git a/block/qapi.c b/block/qapi.c
index ab1dd24..e7d1591 100644
--- a/block/qapi.c
+++ b/block/qapi.c
@@ -25,6 +25,9 @@ 
 #include "block/qapi.h"
 #include "block/block_int.h"
 #include "qmp-commands.h"
+#include "qapi-visit.h"
+#include "qapi/qmp-output-visitor.h"
+#include "qapi/qmp/types.h"
 
 /*
  * Returns 0 on success, with *p_list either set to describe snapshot
@@ -426,6 +429,119 @@  void bdrv_snapshot_dump(fprintf_function func_fprintf, void *f,
     }
 }
 
+static void dump_qdict(fprintf_function func_fprintf, void *f, int indentation,
+                       QDict *dict);
+static void dump_qlist(fprintf_function func_fprintf, void *f, int indentation,
+                       QList *list);
+
+static void dump_qobject(fprintf_function func_fprintf, void *f,
+                         int comp_indent, QObject *obj)
+{
+    switch (qobject_type(obj)) {
+        case QTYPE_QINT: {
+            QInt *value = qobject_to_qint(obj);
+            func_fprintf(f, "%" PRId64, qint_get_int(value));
+            break;
+        }
+        case QTYPE_QSTRING: {
+            QString *value = qobject_to_qstring(obj);
+            func_fprintf(f, "%s", qstring_get_str(value));
+            break;
+        }
+        case QTYPE_QDICT: {
+            QDict *value = qobject_to_qdict(obj);
+            dump_qdict(func_fprintf, f, comp_indent, value);
+            break;
+        }
+        case QTYPE_QLIST: {
+            QList *value = qobject_to_qlist(obj);
+            dump_qlist(func_fprintf, f, comp_indent, value);
+            break;
+        }
+        case QTYPE_QFLOAT: {
+            QFloat *value = qobject_to_qfloat(obj);
+            func_fprintf(f, "%g", qfloat_get_double(value));
+            break;
+        }
+        case QTYPE_QBOOL: {
+            QBool *value = qobject_to_qbool(obj);
+            func_fprintf(f, "%s", qbool_get_int(value) ? "true" : "false");
+            break;
+        }
+        case QTYPE_QERROR: {
+            QString *value = qerror_human((QError *)obj);
+            func_fprintf(f, "%s", qstring_get_str(value));
+            break;
+        }
+        case QTYPE_NONE:
+            break;
+        case QTYPE_MAX:
+        default:
+            abort();
+    }
+}
+
+static void dump_qlist(fprintf_function func_fprintf, void *f, int indentation,
+                       QList *list)
+{
+    const QListEntry *entry;
+    int i = 0;
+
+    for (entry = qlist_first(list); entry; entry = qlist_next(entry), i++) {
+        qtype_code type = qobject_type(entry->value);
+        bool composite = (type == QTYPE_QDICT || type == QTYPE_QLIST);
+        const char *format = composite ? "%*s[%i]:\n" : "%*s[%i]: ";
+
+        func_fprintf(f, format, indentation * 4, "", i);
+        dump_qobject(func_fprintf, f, indentation + 1, entry->value);
+        if (!composite) {
+            func_fprintf(f, "\n");
+        }
+    }
+}
+
+static void dump_qdict(fprintf_function func_fprintf, void *f, int indentation,
+                       QDict *dict)
+{
+    const QDictEntry *entry;
+
+    for (entry = qdict_first(dict); entry; entry = qdict_next(dict, entry)) {
+        qtype_code type = qobject_type(entry->value);
+        bool composite = (type == QTYPE_QDICT || type == QTYPE_QLIST);
+        const char *format = composite ? "%*s%s:\n" : "%*s%s: ";
+        char key[strlen(entry->key) + 1];
+        int i;
+
+        /* replace dashes with spaces in key (variable) names */
+        for (i = 0; entry->key[i]; i++) {
+            key[i] = entry->key[i] == '-' ? ' ' : entry->key[i];
+        }
+        key[i] = 0;
+
+        func_fprintf(f, format, indentation * 4, "", key);
+        dump_qobject(func_fprintf, f, indentation + 1, entry->value);
+        if (!composite) {
+            func_fprintf(f, "\n");
+        }
+    }
+}
+
+void bdrv_image_info_specific_dump(fprintf_function func_fprintf, void *f,
+                                   ImageInfoSpecific *info_spec)
+{
+    Error *local_err = NULL;
+    QmpOutputVisitor *ov = qmp_output_visitor_new();
+    QObject *obj, *data;
+
+    visit_type_ImageInfoSpecific(qmp_output_get_visitor(ov), &info_spec, NULL,
+                                 &local_err);
+    obj = qmp_output_get_qobject(ov);
+    assert(qobject_type(obj) == QTYPE_QDICT);
+    data = qdict_get(qobject_to_qdict(obj), "data");
+    dump_qobject(func_fprintf, f, 0, data);
+    qmp_output_visitor_cleanup(ov);
+}
+
 void bdrv_image_info_dump(fprintf_function func_fprintf, void *f,
                           ImageInfo *info)
 {
@@ -496,4 +612,9 @@  void bdrv_image_info_dump(fprintf_function func_fprintf, void *f,
             func_fprintf(f, "\n");
         }
     }
+
+    if (info->has_format_specific) {
+        func_fprintf(f, "Format specific information:\n");
+        bdrv_image_info_specific_dump(func_fprintf, f, info->format_specific);
+    }
 }
diff --git a/include/block/qapi.h b/include/block/qapi.h
index 0496cc9..9518ee4 100644
--- a/include/block/qapi.h
+++ b/include/block/qapi.h
@@ -42,6 +42,8 @@  BlockStats *bdrv_query_stats(const BlockDriverState *bs);
 
 void bdrv_snapshot_dump(fprintf_function func_fprintf, void *f,
                         QEMUSnapshotInfo *sn);
+void bdrv_image_info_specific_dump(fprintf_function func_fprintf, void *f,
+                                   ImageInfoSpecific *info_spec);
 void bdrv_image_info_dump(fprintf_function func_fprintf, void *f,
                           ImageInfo *info);
 #endif
diff --git a/qemu-io-cmds.c b/qemu-io-cmds.c
index 8565d49..667f4e4 100644
--- a/qemu-io-cmds.c
+++ b/qemu-io-cmds.c
@@ -10,6 +10,7 @@ 
 
 #include "qemu-io.h"
 #include "block/block_int.h"
+#include "block/qapi.h"
 #include "qemu/main-loop.h"
 
 #define CMD_NOFILE_OK   0x01
@@ -1678,6 +1679,7 @@  static const cmdinfo_t length_cmd = {
 static int info_f(BlockDriverState *bs, int argc, char **argv)
 {
     BlockDriverInfo bdi;
+    ImageInfoSpecific *spec_info;
     char s1[64], s2[64];
     int ret;
 
@@ -1699,6 +1701,13 @@  static int info_f(BlockDriverState *bs, int argc, char **argv)
     printf("cluster size: %s\n", s1);
     printf("vm state offset: %s\n", s2);
 
+    spec_info = bdrv_get_specific_info(bs);
+    if (spec_info) {
+        printf("Format specific information:\n");
+        bdrv_image_info_specific_dump(fprintf, stdout, spec_info);
+        qapi_free_ImageInfoSpecific(spec_info);
+    }
+
     return 0;
 }