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API: Add api to set and get domain metadata

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This patch adds API to modify domain metadata for running and stopped
domains. The api supports changing description, title as well as the
newly added <metadata> element. The API has support for storing data in
the metadata element using xml namespaces.

* include/libvirt/libvirt.h.in
* src/libvirt_public.syms
        - add function headers
        - add enum to select metadata to operate on
        - export functions
* src/libvirt.c
        - add public api implementation
* src/driver.h
        - add driver support
* src/remote/remote_driver.c
* src/remote/remote_protocol.x
        - wire up the remote protocol
* include/libvirt/virterror.h
* src/util/virterror.c
        - add a new error message note that metadata for domain are
        missing
This commit is contained in:
Peter Krempa 2012-02-01 14:03:50 +01:00 committed by Eric Blake
parent b79ba8382e
commit c471e55e10
9 changed files with 272 additions and 2 deletions
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24
include/libvirt/libvirt.h.in
View File

@ -1496,6 +1496,30 @@ int virDomainGetMaxVcpus (virDomainPtr domain);
int virDomainGetSecurityLabel (virDomainPtr domain,
virSecurityLabelPtr seclabel);
typedef enum {
VIR_DOMAIN_METADATA_DESCRIPTION = 0, /* Operate on <description> */
VIR_DOMAIN_METADATA_TITLE = 1, /* Operate on <title> */
VIR_DOMAIN_METADATA_ELEMENT = 2, /* Operate on <metadata> */
#ifdef VIR_ENUM_SENTINELS
VIR_DOMAIN_METADATA_LAST
#endif
} virDomainMetadataType;
int
virDomainSetMetadata(virDomainPtr domain,
int type,
const char *metadata,
const char *key,
const char *uri,
unsigned int flags);
char *
virDomainGetMetadata(virDomainPtr domain,
int type,
const char *uri,
unsigned int flags);
/*
* XML domain description
*/

1
include/libvirt/virterror.h
View File

@ -244,6 +244,7 @@ typedef enum {
VIR_ERR_OPERATION_ABORTED = 78, /* operation on a domain was
canceled/aborted by user */
VIR_ERR_AUTH_CANCELLED = 79, /* authentication cancelled */
VIR_ERR_NO_DOMAIN_METADATA = 80, /* The metadata is not present */
} virErrorNumber;
/**

16
src/driver.h
View File

@ -816,6 +816,20 @@ typedef int
unsigned int maxerrors,
unsigned int flags);
typedef int
(*virDrvDomainSetMetadata)(virDomainPtr dom,
int type,
const char *metadata,
const char *key,
const char *uri,
unsigned int flags);
typedef char *
(*virDrvDomainGetMetadata)(virDomainPtr dom,
int type,
const char *uri,
unsigned int flags);
/**
* _virDriver:
*
@ -988,6 +1002,8 @@ struct _virDriver {
virDrvDomainGetBlockIoTune domainGetBlockIoTune;
virDrvDomainGetCPUStats domainGetCPUStats;
virDrvDomainGetDiskErrors domainGetDiskErrors;
virDrvDomainSetMetadata domainSetMetadata;
virDrvDomainGetMetadata domainGetMetadata;
};
typedef int

178
src/libvirt.c
View File

@ -8886,6 +8886,184 @@ error:
return -1;
}
/**
* virDomainSetMetadata:
* @domain: a domain object
* @type: type of description, from virDomainMetadataType
* @metadata: new metadata text
* @key: XML namespace key, or NULL
* @uri: XML namespace URI, or NULL
* @flags: bitwise-OR of virDomainModificationImpact
*
* Sets the appropriate domain element given by @type to the
* value of @description. A @type of VIR_DOMAIN_METADATA_DESCRIPTION
* is free-form text; VIR_DOMAIN_METADATA_TITLE is free-form, but no
* newlines are permitted, and should be short (although the length is
* not enforced). For these two options @key and @uri are irrelevant and
* must be set to NULL.
*
* For type VIR_DOMAIN_METADATA_ELEMENT @metadata must be well-formed
* XML belonging to namespace defined by @uri with local name @key.
*
* Passing NULL for @metadata says to remove that element from the
* domain XML (passing the empty string leaves the element present).
*
* The resulting metadata will be present in virDomainGetXMLDesc(),
* as well as quick access through virDomainGetMetadata().
*
* @flags controls whether the live domain, persistent configuration,
* or both will be modified.
*
* Returns 0 on success, -1 in case of failure.
*/
int
virDomainSetMetadata(virDomainPtr domain,
int type,
const char *metadata,
const char *key,
const char *uri,
unsigned int flags)
{
virConnectPtr conn;
VIR_DOMAIN_DEBUG(domain,
"type=%d, metadata='%s', key='%s', uri='%s', flags=%x",
type, NULLSTR(metadata), NULLSTR(key), NULLSTR(uri),
flags);
if (!VIR_IS_CONNECTED_DOMAIN(domain)) {
virLibDomainError(VIR_ERR_INVALID_DOMAIN, __FUNCTION__);
goto error;
}
conn = domain->conn;
if (conn->flags & VIR_CONNECT_RO) {
virLibDomainError(VIR_ERR_OPERATION_DENIED, __FUNCTION__);
goto error;
}
switch (type) {
case VIR_DOMAIN_METADATA_TITLE:
if (metadata && strchr(metadata, '\n')) {
virLibDomainError(VIR_ERR_INVALID_ARG, "%s",
_("Domain title can't contain newlines"));
goto error;
}
/* fallthrough */
case VIR_DOMAIN_METADATA_DESCRIPTION:
if (uri || key) {
virLibDomainError(VIR_ERR_INVALID_ARG, __FUNCTION__);
goto error;
}
break;
case VIR_DOMAIN_METADATA_ELEMENT:
if (!uri || !key) {
virLibDomainError(VIR_ERR_INVALID_ARG, __FUNCTION__);
goto error;
}
break;
default:
/* For future expansion */
break;
}
if (conn->driver->domainSetMetadata) {
int ret;
ret = conn->driver->domainSetMetadata(domain, type, metadata, key, uri,
flags);
if (ret < 0)
goto error;
return ret;
}
virLibConnError(VIR_ERR_NO_SUPPORT, __FUNCTION__);
error:
virDispatchError(domain->conn);
return -1;
}
/**
* virDomainGetMetadata:
* @domain: a domain object
* @type: type of description, from virDomainMetadataType
* @uri: XML namespace identifier
* @flags: bitwise-OR of virDomainModificationImpact
*
* Retrieves the appropriate domain element given by @type.
* If VIR_DOMAIN_METADATA_ELEMENT is requested parameter @uri
* must be set to the name of the namespace the requested elements
* belong to, otherwise must be NULL.
*
* If an element of the domain XML is not present, the resulting
* error will be VIR_ERR_NO_DOMAIN_METADATA. This method forms
* a shortcut for seeing information from virDomainSetMetadata()
* without having to go through virDomainGetXMLDesc().
*
* @flags controls whether the live domain or persistent
* configuration will be queried.
*
* Returns the metadata string on success (caller must free),
* or NULL in case of failure.
*/
char *
virDomainGetMetadata(virDomainPtr domain,
int type,
const char *uri,
unsigned int flags)
{
virConnectPtr conn;
VIR_DOMAIN_DEBUG(domain, "type=%d, uri='%s', flags=%x",
type, NULLSTR(uri), flags);
if (!VIR_IS_CONNECTED_DOMAIN(domain)) {
virLibDomainError(VIR_ERR_INVALID_DOMAIN, __FUNCTION__);
goto error;
}
if ((flags & VIR_DOMAIN_AFFECT_LIVE) &&
(flags & VIR_DOMAIN_AFFECT_CONFIG)) {
virLibDomainError(VIR_ERR_INVALID_ARG, __FUNCTION__);
goto error;
}
switch (type) {
case VIR_DOMAIN_METADATA_TITLE:
case VIR_DOMAIN_METADATA_DESCRIPTION:
if (uri) {
virLibDomainError(VIR_ERR_INVALID_ARG, __FUNCTION__);
goto error;
}
break;
case VIR_DOMAIN_METADATA_ELEMENT:
if (!uri) {
virLibDomainError(VIR_ERR_INVALID_ARG, __FUNCTION__);
goto error;
}
break;
default:
/* For future expansion */
break;
}
conn = domain->conn;
if (conn->driver->domainGetMetadata) {
char *ret;
if (!(ret = conn->driver->domainGetMetadata(domain, type, uri, flags)))
goto error;
return ret;
}
virLibConnError(VIR_ERR_NO_SUPPORT, __FUNCTION__);
error:
virDispatchError(domain->conn);
return NULL;
}
/**
* virNodeGetSecurityModel:
* @conn: a connection object

2
src/libvirt_public.syms
View File

@ -520,7 +520,9 @@ LIBVIRT_0.9.10 {
global:
virDomainGetCPUStats;
virDomainGetDiskErrors;
virDomainGetMetadata;
virDomainPMSuspendForDuration;
virDomainSetMetadata;
virDomainShutdownFlags;
virStorageVolResize;
virStorageVolWipePattern;

2
src/remote/remote_driver.c
View File

@ -4917,6 +4917,8 @@ static virDriver remote_driver = {
.domainGetNumaParameters = remoteDomainGetNumaParameters, /* 0.9.9 */
.domainGetCPUStats = remoteDomainGetCPUStats, /* 0.9.10 */
.domainGetDiskErrors = remoteDomainGetDiskErrors, /* 0.9.10 */
.domainSetMetadata = remoteDomainSetMetadata, /* 0.9.10 */
.domainGetMetadata = remoteDomainGetMetadata, /* 0.9.10 */
};
static virNetworkDriver network_driver = {

24
src/remote/remote_protocol.x
View File

@ -1123,6 +1123,26 @@ struct remote_domain_set_autostart_args {
int autostart;
};
struct remote_domain_set_metadata_args {
remote_nonnull_domain dom;
int type;
remote_string metadata;
remote_string key;
remote_string uri;
unsigned int flags;
};
struct remote_domain_get_metadata_args {
remote_nonnull_domain dom;
int type;
remote_string uri;
unsigned int flags;
};
struct remote_domain_get_metadata_ret {
remote_nonnull_string metadata;
};
struct remote_domain_block_job_abort_args {
remote_nonnull_domain dom;
remote_nonnull_string path;
@ -2729,7 +2749,9 @@ enum remote_procedure {
REMOTE_PROC_DOMAIN_PM_SUSPEND_FOR_DURATION = 261, /* autogen autogen */
REMOTE_PROC_DOMAIN_GET_CPU_STATS = 262, /* skipgen skipgen */
REMOTE_PROC_DOMAIN_GET_DISK_ERRORS = 263 /* skipgen skipgen */
REMOTE_PROC_DOMAIN_GET_DISK_ERRORS = 263, /* skipgen skipgen */
REMOTE_PROC_DOMAIN_SET_METADATA = 264, /* autogen autogen */
REMOTE_PROC_DOMAIN_GET_METADATA = 265 /* autogen autogen */
/*
* Notice how the entries are grouped in sets of 10 ?

19
src/remote_protocol-structs
View File

@ -788,6 +788,23 @@ struct remote_domain_set_autostart_args {
remote_nonnull_domain dom;
int autostart;
};
struct remote_domain_set_metadata_args {
remote_nonnull_domain dom;
int type;
remote_string metadata;
remote_string key;
remote_string uri;
u_int flags;
};
struct remote_domain_get_metadata_args {
remote_nonnull_domain dom;
int type;
remote_string uri;
u_int flags;
};
struct remote_domain_get_metadata_ret {
remote_nonnull_string metadata;
};
struct remote_domain_block_job_abort_args {
remote_nonnull_domain dom;
remote_nonnull_string path;
@ -2146,4 +2163,6 @@ enum remote_procedure {
REMOTE_PROC_DOMAIN_PM_SUSPEND_FOR_DURATION = 261,
REMOTE_PROC_DOMAIN_GET_CPU_STATS = 262,
REMOTE_PROC_DOMAIN_GET_DISK_ERRORS = 263,
REMOTE_PROC_DOMAIN_SET_METADATA = 264,
REMOTE_PROC_DOMAIN_GET_METADATA = 265,
};

8
src/util/virterror.c
View File

@ -1,7 +1,7 @@
/*
* virterror.c: implements error handling and reporting code for libvirt
*
* Copy: Copyright (C) 2006, 2008-2011 Red Hat, Inc.
* Copy: Copyright (C) 2006, 2008-2012 Red Hat, Inc.
*
* See COPYING.LIB for the License of this software
*
@ -1226,6 +1226,12 @@ virErrorMsg(virErrorNumber error, const char *info)
else
errmsg = _("operation aborted: %s");
break;
case VIR_ERR_NO_DOMAIN_METADATA:
if (info == NULL)
errmsg = _("metadata not found");
else
errmsg = _("metadata not found: %s");
break;
}
return (errmsg);
}