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Re: [libvirt] [PATCH 1/7] list: Define new API virConnectListAllNetworks



On 09/04/2012 11:55 AM, Osier Yang wrote:
> This is to list the network objects, supported filtering flags
> are: active|inactive, persistent|transient, autostart|no-autostart.
>
> include/libvirt/libvirt.h.in: Declare enum virConnectListAllNetworkFlags
>                               and virConnectListAllNetworks.
> python/generator.py: Skip auto-generating
> src/driver.h: (virDrvConnectListAllNetworks)
> src/libvirt.c: Implement the public API
> src/libvirt_public.syms: Export the symbol to public
> ---
>  include/libvirt/libvirt.h.in |   20 ++++++++++
>  python/generator.py          |    1 +
>  src/driver.h                 |    5 ++
>  src/libvirt.c                |   86 +++++++++++++++++++++++++++++++++++++++++-
>  src/libvirt_public.syms      |    1 +
>  5 files changed, 111 insertions(+), 2 deletions(-)
>
> diff --git a/include/libvirt/libvirt.h.in b/include/libvirt/libvirt.h.in
> index 58cd6ff..50d865c 100644
> --- a/include/libvirt/libvirt.h.in
> +++ b/include/libvirt/libvirt.h.in
> @@ -2279,6 +2279,26 @@ int                     virConnectNumOfDefinedNetworks  (virConnectPtr conn);
>  int                     virConnectListDefinedNetworks   (virConnectPtr conn,
>                                                           char **const names,
>                                                           int maxnames);
> +/*
> + * virConnectListAllNetworks:
> + *
> + * Flags used to filter the returned networks. Flags in each group
> + * are exclusive attributes of a network.
> + */
> +typedef enum {
> +    VIR_CONNECT_LIST_NETWORKS_INACTIVE      = 1 << 0,
> +    VIR_CONNECT_LIST_NETWORKS_ACTIVE        = 1 << 1,
> +
> +    VIR_CONNECT_LIST_NETWORKS_PERSISTENT    = 1 << 2,
> +    VIR_CONNECT_LIST_NETWORKS_TRANSIENT     = 1 << 3,
> +
> +    VIR_CONNECT_LIST_NETWORKS_AUTOSTART     = 1 << 4,
> +    VIR_CONNECT_LIST_NETWORKS_NO_AUTOSTART  = 1 << 5,
> +} virConnectListAllNetworksFlags;
> +
> +int                     virConnectListAllNetworks       (virConnectPtr conn,
> +                                                         virNetworkPtr **nets,
> +                                                         unsigned int flags);
>  
>  /*
>   * Lookup network by name or uuid
> diff --git a/python/generator.py b/python/generator.py
> index 276b4ff..a9a401b 100755
> --- a/python/generator.py
> +++ b/python/generator.py
> @@ -462,6 +462,7 @@ skip_function = (
>      'virDomainSnapshotListAllChildren', # overridden in virDomainSnapshot.py
>      'virConnectListAllStoragePools', # overridden in virConnect.py
>      'virStoragePoolListAllVolumes', # overridden in virStoragePool.py
> +    'virConnectListAllNetworks', # overridden in virConnect.py
>  
>      'virStreamRecvAll', # Pure python libvirt-override-virStream.py
>      'virStreamSendAll', # Pure python libvirt-override-virStream.py
> diff --git a/src/driver.h b/src/driver.h
> index 1bdfd29..534da05 100644
> --- a/src/driver.h
> +++ b/src/driver.h
> @@ -1082,6 +1082,10 @@ typedef int
>          (*virDrvListDefinedNetworks)    (virConnectPtr conn,
>                                           char **const names,
>                                           int maxnames);
> +typedef int
> +        (*virDrvListAllNetworks)        (virConnectPtr conn,
> +                                         virNetworkPtr **nets,
> +                                         unsigned int flags);
>  typedef virNetworkPtr
>          (*virDrvNetworkLookupByUUID)    (virConnectPtr conn,
>                                           const unsigned char *uuid);
> @@ -1140,6 +1144,7 @@ struct _virNetworkDriver {
>          virDrvListNetworks          listNetworks;
>          virDrvNumOfDefinedNetworks  numOfDefinedNetworks;
>          virDrvListDefinedNetworks   listDefinedNetworks;
> +        virDrvListAllNetworks       listAllNetworks;
>          virDrvNetworkLookupByUUID   networkLookupByUUID;
>          virDrvNetworkLookupByName   networkLookupByName;
>          virDrvNetworkCreateXML      networkCreateXML;
> diff --git a/src/libvirt.c b/src/libvirt.c
> index 700dbef..686af8a 100644
> --- a/src/libvirt.c
> +++ b/src/libvirt.c
> @@ -9799,6 +9799,76 @@ virNetworkGetConnect (virNetworkPtr net)
>  }
>  
>  /**
> + * virConnectListAllNetworks:
> + * @conn: Pointer to the hypervisor connection.
> + * @nets: Pointer to a variable to store the array containing the network
> + *        objects or NULL if the list is not required (just returns number
> + *        of networks).
> + * @flags: bitwise-OR of virConnectListAllNetworksFlags.
> + *
> + * Collect the list of networks, and allocate an array to store those
> + * objects. This API solves the race inherent between virConnectListNetworks
> + * and virConnectListDefinedNetworks.
> + *
> + * Normally, all networks are returned; however, @flags can be used to
> + * filter the results for a smaller list of targeted networks.  The valid
> + * flags are divided into groups, where each group contains bits that
> + * describe mutually exclusive attributes of a network, and where all bits
> + * within a group describe all possible networks.
> + *
> + * The first group of @flags is VIR_CONNECT_LIST_NETWORKS_ACTIVE (up) and
> + * VIR_CONNECT_LIST_NETWORKS_INACTIVE (down) to filter the networks by state.
> + *
> + * The second group of @flags is VIR_CONNECT_LIST_NETWORKS_PERSISTENT (defined)
> + * and VIR_CONNECT_LIST_NETWORKS_TRANSIENT (running but not defined), to filter
> + * the networks by whether they have persistent config or not.
> + *
> + * The third group of @flags is VIR_CONNECT_LIST_NETWORKS_AUTOSTART
> + * and VIR_CONNECT_LIST_NETWORKS_NO_AUTOSTART, to filter the networks by
> + * whether they are marked as autostart or not.
> + *
> + * Returns the number of networks found or -1 and sets @nets to  NULL in case
> + * of error.  On success, the array stored into @nets is guaranteed to have an
> + * extra allocated element set to NULL but not included in the return count,
> + * to make iteration easier.  The caller is responsible for calling
> + * virNetworkFree() on each array element, then calling free() on @nets.
> + */
> +int
> +virConnectListAllNetworks(virConnectPtr conn,
> +                          virNetworkPtr **nets,
> +                          unsigned int flags)
> +{
> +    VIR_DEBUG("conn=%p, nets=%p, flags=%x", conn, nets, flags);
> +
> +    virResetLastError();
> +
> +    if (nets)
> +        *nets = NULL;
> +
> +    if (!VIR_IS_CONNECT(conn)) {
> +        virLibConnError(VIR_ERR_INVALID_CONN, __FUNCTION__);
> +        virDispatchError(NULL);
> +        return -1;
> +    }
> +
> +    if (conn->networkDriver &&
> +        conn->networkDriver->listAllNetworks) {
> +        int ret;
> +        ret = conn->networkDriver->listAllNetworks(conn, nets, flags);
> +        if (ret < 0)
> +            goto error;
> +        return ret;
> +    }
> +
> +    virLibConnError(VIR_ERR_NO_SUPPORT, __FUNCTION__);
> +
> +error:
> +    virDispatchError(conn);
> +    return -1;
> +}
> +
> +
> +/**
>   * virConnectNumOfNetworks:
>   * @conn: pointer to the hypervisor connection
>   *
> @@ -9842,7 +9912,13 @@ error:
>   *
>   * Collect the list of active networks, and store their names in @names
>   *
> - * Returns the number of networks found or -1 in case of error
> + * For more control over the results, see virConnectListAllNetworks().
> + *
> + * Returns the number of networks found or -1 in case of error.  Note that
> + * this command is inherently racy; a network can be started between a call
> + * to virConnectNumOfNetworks() and this call; you are only guaranteed that
> + * all currently active networks were listed if the return is less than
> + * @maxnames.
>   */
>  int
>  virConnectListNetworks(virConnectPtr conn, char **const names, int maxnames)
> @@ -9919,7 +9995,13 @@ error:
>   *
>   * list the inactive networks, stores the pointers to the names in @names
>   *
> - * Returns the number of names provided in the array or -1 in case of error
> + * For more control over the results, see virConnectListAllNetworks().
> + *
> + * Returns the number of names provided in the array or -1 in case of error.
> + * Note that this command is inherently racy; a network can be defined between
> + * a call to virConnectNumOfDefinedNetworks() and this call; you are only
> + * guaranteed that all currently defined networks were listed if the return
> + * is less than @maxnames.  The client must call free() on each returned name.
>   */
>  int
>  virConnectListDefinedNetworks(virConnectPtr conn, char **const names,
> diff --git a/src/libvirt_public.syms b/src/libvirt_public.syms
> index 53db37f..6ff5a77 100644
> --- a/src/libvirt_public.syms
> +++ b/src/libvirt_public.syms
> @@ -556,6 +556,7 @@ LIBVIRT_0.10.0 {
>  
>  LIBVIRT_0.10.2 {
>      global:
> +        virConnectListAllNetworks;
>          virConnectListAllStoragePools;
>          virStoragePoolListAllVolumes;
>  } LIBVIRT_0.10.0;

ACK. I think this horse has been beaten enough :-)


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