[libvirt] [PATCH 16/25] util: qemu: Allow for different approaches to format JSON arrays
Peter Krempa
pkrempa at redhat.com
Mon Jul 25 18:12:01 UTC 2016
For use with memory hotplug virQEMUBuildCommandLineJSONRecurse attempted
to format JSON arrays as bitmap on the command line. Make the formatter
function configurable so that it can be reused with different syntaxes
of arrays such as numbered arrays for use with disk sources.
This patch extracts the code and adds a parameter for the function that
will allow to plug in different formatters.
---
src/libvirt_private.syms | 1 +
src/util/virqemu.c | 73 ++++++++++++++++++++++++++++++---------------
src/util/virqemu.h | 10 ++++++-
tests/qemucommandutiltest.c | 3 +-
4 files changed, 61 insertions(+), 26 deletions(-)
diff --git a/src/libvirt_private.syms b/src/libvirt_private.syms
index 0ce95b2..9937200 100644
--- a/src/libvirt_private.syms
+++ b/src/libvirt_private.syms
@@ -2207,6 +2207,7 @@ virProcessWait;
# util/virqemu.h
virQEMUBuildBufferEscapeComma;
virQEMUBuildCommandLineJSON;
+virQEMUBuildCommandLineJSONArrayBitmap;
virQEMUBuildLuksOpts;
virQEMUBuildObjectCommandlineFromJSON;
diff --git a/src/util/virqemu.c b/src/util/virqemu.c
index df665ad..3cc59e7 100644
--- a/src/util/virqemu.c
+++ b/src/util/virqemu.c
@@ -36,6 +36,7 @@ VIR_LOG_INIT("util.qemu");
struct virQEMUCommandLineJSONIteratorData {
const char *prefix;
virBufferPtr buf;
+ virQEMUBuildCommandLineJSONArrayFormatFunc arrayFunc;
};
@@ -43,8 +44,41 @@ static int
virQEMUBuildCommandLineJSONRecurse(const char *key,
const virJSONValue *value,
virBufferPtr buf,
+ virQEMUBuildCommandLineJSONArrayFormatFunc arrayFunc,
bool nested);
+
+
+int
+virQEMUBuildCommandLineJSONArrayBitmap(const char *key,
+ const virJSONValue *array,
+ virBufferPtr buf)
+{
+ ssize_t pos = -1;
+ ssize_t end;
+ virBitmapPtr bitmap = NULL;
+
+ if (virJSONValueGetArrayAsBitmap(array, &bitmap) < 0)
+ return -1;
+
+ while ((pos = virBitmapNextSetBit(bitmap, pos)) > -1) {
+ if ((end = virBitmapNextClearBit(bitmap, pos)) < 0)
+ end = virBitmapLastSetBit(bitmap) + 1;
+
+ if (end - 1 > pos) {
+ virBufferAsprintf(buf, ",%s=%zd-%zd", key, pos, end - 1);
+ pos = end;
+ } else {
+ virBufferAsprintf(buf, ",%s=%zd", key, pos);
+ }
+ }
+
+ virBitmapFree(bitmap);
+
+ return 0;
+}
+
+
/* internal iterator to handle nested object formatting */
static int
virQEMUBuildCommandLineJSONIterate(const char *key,
@@ -59,11 +93,13 @@ virQEMUBuildCommandLineJSONIterate(const char *key,
if (virAsprintf(&tmpkey, "%s.%s", data->prefix, key) < 0)
return -1;
- ret = virQEMUBuildCommandLineJSONRecurse(tmpkey, value, data->buf, false);
+ ret = virQEMUBuildCommandLineJSONRecurse(tmpkey, value, data->buf,
+ data->arrayFunc, false);
VIR_FREE(tmpkey);
} else {
- ret = virQEMUBuildCommandLineJSONRecurse(key, value, data->buf, false);
+ ret = virQEMUBuildCommandLineJSONRecurse(key, value, data->buf,
+ data->arrayFunc, false);
}
return ret;
@@ -74,13 +110,11 @@ static int
virQEMUBuildCommandLineJSONRecurse(const char *key,
const virJSONValue *value,
virBufferPtr buf,
+ virQEMUBuildCommandLineJSONArrayFormatFunc arrayFunc,
bool nested)
{
- struct virQEMUCommandLineJSONIteratorData data = { key, buf };
+ struct virQEMUCommandLineJSONIteratorData data = { key, buf, arrayFunc };
virJSONValuePtr elem;
- virBitmapPtr bitmap = NULL;
- ssize_t pos = -1;
- ssize_t end;
size_t i;
if (!key && value->type != VIR_JSON_TYPE_OBJECT) {
@@ -115,26 +149,15 @@ virQEMUBuildCommandLineJSONRecurse(const char *key,
return -1;
}
- if (virJSONValueGetArrayAsBitmap(value, &bitmap) == 0) {
- while ((pos = virBitmapNextSetBit(bitmap, pos)) > -1) {
- if ((end = virBitmapNextClearBit(bitmap, pos)) < 0)
- end = virBitmapLastSetBit(bitmap) + 1;
-
- if (end - 1 > pos) {
- virBufferAsprintf(buf, ",%s=%zd-%zd", key, pos, end - 1);
- pos = end;
- } else {
- virBufferAsprintf(buf, ",%s=%zd", key, pos);
- }
- }
- } else {
+ if (!arrayFunc || arrayFunc(key, value, buf) < 0) {
/* fallback, treat the array as a non-bitmap, adding the key
* for each member */
for (i = 0; i < virJSONValueArraySize(value); i++) {
elem = virJSONValueArrayGet((virJSONValuePtr)value, i);
/* recurse to avoid duplicating code */
- if (virQEMUBuildCommandLineJSONRecurse(key, elem, buf, true) < 0)
+ if (virQEMUBuildCommandLineJSONRecurse(key, elem, buf,
+ arrayFunc, true) < 0)
return -1;
}
}
@@ -153,7 +176,6 @@ virQEMUBuildCommandLineJSONRecurse(const char *key,
return -1;
}
- virBitmapFree(bitmap);
return 0;
}
@@ -162,6 +184,7 @@ virQEMUBuildCommandLineJSONRecurse(const char *key,
* virQEMUBuildCommandLineJSON:
* @value: json object containing the value
* @buf: otuput buffer
+ * @arrayFunc: array formatter function to allow for different syntax
*
* Formats JSON value object into command line parameters suitable for use with
* qemu.
@@ -170,9 +193,10 @@ virQEMUBuildCommandLineJSONRecurse(const char *key,
*/
int
virQEMUBuildCommandLineJSON(const virJSONValue *value,
- virBufferPtr buf)
+ virBufferPtr buf,
+ virQEMUBuildCommandLineJSONArrayFormatFunc array)
{
- return virQEMUBuildCommandLineJSONRecurse(NULL, value, buf, false);
+ return virQEMUBuildCommandLineJSONRecurse(NULL, value, buf, array, false);
}
@@ -186,7 +210,8 @@ virQEMUBuildObjectCommandlineFromJSON(const char *type,
virBufferAsprintf(&buf, "%s,id=%s", type, alias);
- if (virQEMUBuildCommandLineJSON(props, &buf) < 0)
+ if (virQEMUBuildCommandLineJSON(props, &buf,
+ virQEMUBuildCommandLineJSONArrayBitmap) < 0)
goto cleanup;
if (virBufferCheckError(&buf) < 0)
diff --git a/src/util/virqemu.h b/src/util/virqemu.h
index efc6c42..801c35b 100644
--- a/src/util/virqemu.h
+++ b/src/util/virqemu.h
@@ -29,8 +29,16 @@
# include "virjson.h"
# include "virstorageencryption.h"
+typedef int (*virQEMUBuildCommandLineJSONArrayFormatFunc)(const char *key,
+ const virJSONValue *array,
+ virBufferPtr buf);
+int virQEMUBuildCommandLineJSONArrayBitmap(const char *key,
+ const virJSONValue *array,
+ virBufferPtr buf);
+
int virQEMUBuildCommandLineJSON(const virJSONValue *value,
- virBufferPtr buf);
+ virBufferPtr buf,
+ virQEMUBuildCommandLineJSONArrayFormatFunc array);
char *virQEMUBuildObjectCommandlineFromJSON(const char *type,
const char *alias,
diff --git a/tests/qemucommandutiltest.c b/tests/qemucommandutiltest.c
index 4872ea3..a5e3153 100644
--- a/tests/qemucommandutiltest.c
+++ b/tests/qemucommandutiltest.c
@@ -51,7 +51,8 @@ testQemuCommandBuildFromJSON(const void *opaque)
virAsprintf(&expect, ",%s", data->expectprops) < 0)
return -1;
- if (virQEMUBuildCommandLineJSON(val, &buf) < 0) {
+ if (virQEMUBuildCommandLineJSON(val, &buf,
+ virQEMUBuildCommandLineJSONArrayBitmap) < 0) {
fprintf(stderr,
"\nvirQEMUBuildCommandlineJSON failed process JSON:\n%s\n",
data->props);
--
2.9.0
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