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[libvirt] [PATCH v4 13/17] interface: Use virObjectLookup{Keys|Hash}



Use the virObjectLookupKeys in _virInterfaceObj and use the
virObjectLookupHash in _virInterfaceObjList.

Convert the code to use the LookupHash object and APIs rather
than the local forward linked list processing.

Usage of HashLookup{Find|Search} API's is via a callback mechanism
and returns a locked/reffed object.

The Clone API will make use of the ForEach functionality in
copying whatever is in one HashLookup list into the destination.

The only function requiring taking a lock is the AssignDef
function since it needs to be synchronized in such a way to
avoid multiple threads attempting to add the same named
object at the same time.

The NumOfInterfaces and GetNames can use the same callback
function with the only difference being the filling in of the
@names array from the passed @data structure if it exists.

Signed-off-by: John Ferlan <jferlan redhat com>
---
 src/conf/virinterfaceobj.c | 300 ++++++++++++++++++++++++---------------------
 1 file changed, 157 insertions(+), 143 deletions(-)

diff --git a/src/conf/virinterfaceobj.c b/src/conf/virinterfaceobj.c
index e993b92..f2475b8 100644
--- a/src/conf/virinterfaceobj.c
+++ b/src/conf/virinterfaceobj.c
@@ -33,15 +33,13 @@
 VIR_LOG_INIT("conf.virinterfaceobj");
 
 struct _virInterfaceObj {
-    virObjectLockable parent;
+    virObjectLookupKeys parent;
 
-    bool active;           /* true if interface is active (up) */
     virInterfaceDefPtr def; /* The interface definition */
 };
 
 struct _virInterfaceObjList {
-    size_t count;
-    virInterfaceObjPtr *objs;
+    virObjectLookupHash parent;
 };
 
 /* virInterfaceObj manipulation */
@@ -52,7 +50,7 @@ static void virInterfaceObjDispose(void *obj);
 static int
 virInterfaceObjOnceInit(void)
 {
-    if (!(virInterfaceObjClass = virClassNew(virClassForObjectLockable(),
+    if (!(virInterfaceObjClass = virClassNew(virClassForObjectLookupKeys(),
                                              "virInterfaceObj",
                                              sizeof(virInterfaceObj),
                                              virInterfaceObjDispose)))
@@ -74,14 +72,14 @@ virInterfaceObjDispose(void *opaque)
 
 
 static virInterfaceObjPtr
-virInterfaceObjNew(void)
+virInterfaceObjNew(const char *name)
 {
     virInterfaceObjPtr obj;
 
     if (virInterfaceObjInitialize() < 0)
         return NULL;
 
-    if (!(obj = virObjectLockableNew(virInterfaceObjClass)))
+    if (!(obj = virObjectLookupKeysNew(virInterfaceObjClass, name, NULL)))
         return NULL;
 
     virObjectLock(obj);
@@ -112,7 +110,7 @@ virInterfaceObjGetDef(virInterfaceObjPtr obj)
 bool
 virInterfaceObjIsActive(virInterfaceObjPtr obj)
 {
-    return obj->active;
+    return virObjectLookupKeysIsActive(obj);
 }
 
 
@@ -120,7 +118,7 @@ void
 virInterfaceObjSetActive(virInterfaceObjPtr obj,
                          bool active)
 {
-    obj->active = active;
+    virObjectLookupKeysSetActive(obj, active);
 }
 
 
@@ -128,11 +126,40 @@ virInterfaceObjSetActive(virInterfaceObjPtr obj,
 virInterfaceObjListPtr
 virInterfaceObjListNew(void)
 {
-    virInterfaceObjListPtr interfaces;
+    return virObjectLookupHashNew(virClassForObjectLookupHash(), 10, false);
+}
 
-    if (VIR_ALLOC(interfaces) < 0)
-        return NULL;
-    return interfaces;
+
+static int
+virInterfaceObjListFindByMACStringCb(void *payload,
+                                     const void *name ATTRIBUTE_UNUSED,
+                                     void *opaque)
+{
+    virInterfaceObjPtr obj = payload;
+    virObjectLookupHashForEachDataPtr data = opaque;
+    char **const matches = (char **const)data->elems;
+    virInterfaceDefPtr def;
+    int ret = -1;
+
+    if (data->error)
+        return 0;
+
+    virObjectLock(obj);
+    def = obj->def;
+    if (STRCASEEQ(def->mac, data->matchStr)) {
+        if (data->nElems < data->maxElems) {
+            if (VIR_STRDUP(matches[data->nElems], def->name) < 0) {
+                data->error = true;
+                goto cleanup;
+            }
+            data->nElems++;
+        }
+    }
+    ret = 0;
+
+ cleanup:
+    virObjectUnlock(obj);
+    return ret;
 }
 
 
@@ -142,33 +169,22 @@ virInterfaceObjListFindByMACString(virInterfaceObjListPtr interfaces,
                                    char **const matches,
                                    int maxmatches)
 {
-    size_t i;
-    int matchct = 0;
-
-    for (i = 0; i < interfaces->count; i++) {
-        virInterfaceObjPtr obj = interfaces->objs[i];
-        virInterfaceDefPtr def;
-
-        virObjectLock(obj);
-        def = obj->def;
-        if (STRCASEEQ(def->mac, mac)) {
-            if (matchct < maxmatches) {
-                if (VIR_STRDUP(matches[matchct], def->name) < 0) {
-                    virObjectUnlock(obj);
-                    goto error;
-                }
-                matchct++;
-            }
-        }
-        virObjectUnlock(obj);
-    }
-    return matchct;
+    virObjectLookupHashForEachData data = {
+        .error = false, .matchStr = mac, .nElems = 0,
+        .elems = (void **)matches, .maxElems = maxmatches };
+
+    return virObjectLookupHashForEach(interfaces,
+                                      virInterfaceObjListFindByMACStringCb,
+                                      &data);
+}
 
- error:
-    while (--matchct >= 0)
-        VIR_FREE(matches[matchct]);
 
-    return -1;
+static virInterfaceObjPtr
+virInterfaceObjListFindByNameLocked(virInterfaceObjListPtr interfaces,
+                                    const char *name)
+{
+    virObjectLookupKeysPtr obj = virObjectLookupHashFindLocked(interfaces, name);
+    return (virInterfaceObjPtr)obj;
 }
 
 
@@ -176,73 +192,73 @@ virInterfaceObjPtr
 virInterfaceObjListFindByName(virInterfaceObjListPtr interfaces,
                               const char *name)
 {
-    size_t i;
-
-    for (i = 0; i < interfaces->count; i++) {
-        virInterfaceObjPtr obj = interfaces->objs[i];
-        virInterfaceDefPtr def;
-
-        virObjectLock(obj);
-        def = obj->def;
-        if (STREQ(def->name, name))
-            return virObjectRef(obj);
-        virObjectUnlock(obj);
-    }
-
-    return NULL;
+    virObjectLookupKeysPtr obj = virObjectLookupHashFind(interfaces, name);
+    return (virInterfaceObjPtr) obj;
 }
 
 
 void
 virInterfaceObjListFree(virInterfaceObjListPtr interfaces)
 {
-    size_t i;
+    virObjectUnref(interfaces);
+}
+
+
+struct interfaceCloneData {
+    const char *primaryKey;
+    virInterfaceObjListPtr dest;
+    bool error;
+};
+
+static int
+virInterfaceObjListCloneCb(void *destHashTable,
+                           void *sourceObject)
+{
+    virInterfaceObjListPtr dest = destHashTable;
+    virInterfaceObjPtr srcObj = sourceObject;
+    int ret = -1;
+    char *xml = NULL;
+    virInterfaceObjPtr obj;
+    virInterfaceDefPtr backup = NULL;
+
+    if (!(xml = virInterfaceDefFormat(srcObj->def)))
+        goto cleanup;
 
-    for (i = 0; i < interfaces->count; i++)
-        virObjectUnref(interfaces->objs[i]);
-    VIR_FREE(interfaces->objs);
-    VIR_FREE(interfaces);
+    if (!(backup = virInterfaceDefParseString(xml)))
+        goto cleanup;
+
+    if (!(obj = virInterfaceObjListAssignDef(dest, backup)))
+        goto cleanup;
+
+    ret = 0;
+
+ cleanup:
+    VIR_FREE(xml);
+    virInterfaceDefFree(backup);
+
+    return ret;
 }
 
 
 virInterfaceObjListPtr
 virInterfaceObjListClone(virInterfaceObjListPtr interfaces)
 {
-    size_t i;
-    unsigned int cnt;
-    virInterfaceObjListPtr dest;
+    virInterfaceObjListPtr destInterfaces = NULL;
 
     if (!interfaces)
         return NULL;
 
-    if (!(dest = virInterfaceObjListNew()))
+    if (!(destInterfaces = virInterfaceObjListNew()))
         return NULL;
 
-    cnt = interfaces->count;
-    for (i = 0; i < cnt; i++) {
-        virInterfaceObjPtr srcobj = interfaces->objs[i];
-        virInterfaceDefPtr backup;
-        virInterfaceObjPtr obj;
-        char *xml = virInterfaceDefFormat(srcobj->def);
+    if (virObjectLookupHashClone(interfaces, destInterfaces,
+                                 virInterfaceObjListCloneCb) < 0)
+        goto cleanup;
 
-        if (!xml)
-            goto error;
-
-        if (!(backup = virInterfaceDefParseString(xml))) {
-            VIR_FREE(xml);
-            goto error;
-        }
-
-        VIR_FREE(xml);
-        if (!(obj = virInterfaceObjListAssignDef(dest, backup)))
-            goto error;
-        virInterfaceObjEndAPI(&obj);
-    }
+    return destInterfaces;
 
-    return dest;
-
- error:
-    virInterfaceObjListFree(dest);
+ cleanup:
+    virObjectUnref(destInterfaces);
     return NULL;
 }
 
@@ -252,24 +268,29 @@ virInterfaceObjListAssignDef(virInterfaceObjListPtr interfaces,
                              virInterfaceDefPtr def)
 {
     virInterfaceObjPtr obj;
+    virInterfaceObjPtr ret = NULL;
+
+    virObjectRWLockWrite(interfaces);
 
-    if ((obj = virInterfaceObjListFindByName(interfaces, def->name))) {
+    if ((obj = virInterfaceObjListFindByNameLocked(interfaces, def->name))) {
         virInterfaceDefFree(obj->def);
         obj->def = def;
+    } else {
+        if (!(obj = virInterfaceObjNew(def->name)))
+            goto cleanup;
 
-        return obj;
+        if (virObjectLookupHashAdd(interfaces, (virObjectLookupKeysPtr)obj) < 0)
+            goto cleanup;
+        obj->def = def;
     }
 
-    if (!(obj = virInterfaceObjNew()))
-        return NULL;
+    ret = obj;
+    obj = NULL;
 
-    if (VIR_APPEND_ELEMENT_COPY(interfaces->objs,
-                                interfaces->count, obj) < 0) {
-        virInterfaceObjEndAPI(&obj);
-        return NULL;
-    }
-    obj->def = def;
-    return virObjectRef(obj);
+ cleanup:
+    virInterfaceObjEndAPI(&obj);
+    virObjectRWUnlock(interfaces);
+    return ret;
 }
 
 
@@ -277,20 +298,39 @@ void
 virInterfaceObjListRemove(virInterfaceObjListPtr interfaces,
                           virInterfaceObjPtr obj)
 {
-    size_t i;
+    virObjectLookupHashRemove(interfaces, (virObjectLookupKeysPtr)obj);
+}
 
-    virObjectUnlock(obj);
-    for (i = 0; i < interfaces->count; i++) {
-        virObjectLock(interfaces->objs[i]);
-        if (interfaces->objs[i] == obj) {
-            virObjectUnlock(interfaces->objs[i]);
-            virObjectUnref(interfaces->objs[i]);
-
-            VIR_DELETE_ELEMENT(interfaces->objs, i, interfaces->count);
-            break;
+
+static int
+virInterfaceObjListGetHelper(void *payload,
+                             const void *name ATTRIBUTE_UNUSED,
+                             void *opaque)
+{
+    virInterfaceObjPtr obj = payload;
+    virObjectLookupHashForEachDataPtr data = opaque;
+    char **const names = (char **const)data->elems;
+    virInterfaceDefPtr def;
+
+    if (data->error)
+        return 0;
+
+    if (data->maxElems >= 0 && data->nElems == data->maxElems)
+        return 0;
+
+    virObjectLock(obj);
+    def = obj->def;
+    if (data->wantActive == virInterfaceObjIsActive(obj)) {
+        if (names && VIR_STRDUP(names[data->nElems], def->name) < 0) {
+            data->error = true;
+            goto cleanup;
         }
-        virObjectUnlock(interfaces->objs[i]);
-    }
+        data->nElems++;
+     }
+
+ cleanup:
+    virObjectUnlock(obj);
+    return 0;
 }
 
 
@@ -298,18 +338,12 @@ int
 virInterfaceObjListNumOfInterfaces(virInterfaceObjListPtr interfaces,
                                    bool wantActive)
 {
-    size_t i;
-    int ninterfaces = 0;
-
-    for (i = 0; (i < interfaces->count); i++) {
-        virInterfaceObjPtr obj = interfaces->objs[i];
-        virObjectLock(obj);
-        if (wantActive == virInterfaceObjIsActive(obj))
-            ninterfaces++;
-        virObjectUnlock(obj);
-    }
+    virObjectLookupHashForEachData data = {
+        .wantActive = wantActive, .error = false, .nElems = 0,
+        .elems = NULL, .maxElems = -2 };
 
-    return ninterfaces;
+    return virObjectLookupHashForEach(interfaces, virInterfaceObjListGetHelper,
+                                      &data);
 }
 
 
@@ -319,30 +353,10 @@ virInterfaceObjListGetNames(virInterfaceObjListPtr interfaces,
                             char **const names,
                             int maxnames)
 {
-    int nnames = 0;
-    size_t i;
-
-    for (i = 0; i < interfaces->count && nnames < maxnames; i++) {
-        virInterfaceObjPtr obj = interfaces->objs[i];
-        virInterfaceDefPtr def;
-
-        virObjectLock(obj);
-        def = obj->def;
-        if (wantActive == virInterfaceObjIsActive(obj)) {
-            if (VIR_STRDUP(names[nnames], def->name) < 0) {
-                virObjectUnlock(obj);
-                goto failure;
-            }
-            nnames++;
-        }
-        virObjectUnlock(obj);
-    }
-
-    return nnames;
-
- failure:
-    while (--nnames >= 0)
-        VIR_FREE(names[nnames]);
+    virObjectLookupHashForEachData data = {
+        .wantActive = wantActive, .error = false, .nElems = 0,
+        .elems = (void **)names, .maxElems = maxnames };
 
-    return -1;
+    return virObjectLookupHashForEach(interfaces, virInterfaceObjListGetHelper,
+                                      &data);
 }
-- 
2.9.4


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