Implement ACL attribute read/write

examples/all-clusters-app/all-clusters-common/all-clusters-app.zap

@@ -900,7 +900,7 @@
               "bounded": 0,
               "defaultValue": "",
               "reportable": 1,
-              "minInterval": 1,
+              "minInterval": 0,
               "maxInterval": 65534,
               "reportableChange": 0
             },
@@ -910,12 +910,12 @@
               "mfgCode": null,
               "side": "server",
               "included": 1,
-              "storageOption": "External",
+              "storageOption": "RAM",
               "singleton": 0,
               "bounded": 0,
               "defaultValue": "",
               "reportable": 1,
-              "minInterval": 1,
+              "minInterval": 0,
               "maxInterval": 65534,
               "reportableChange": 0
             },

src/access/AccessControl.h

@@ -44,7 +44,7 @@ class AccessControl
             static constexpr Flags kCluster    = 1 << 0;
             static constexpr Flags kEndpoint   = 1 << 1;
             static constexpr Flags kDeviceType = 1 << 2;
-            Flags flags;
+            Flags flags                        = 0;
             ClusterId cluster;
             EndpointId endpoint;
             DeviceTypeId deviceType;
@@ -89,6 +89,19 @@ class AccessControl
 
         Entry() = default;
 
+        Entry(Entry && other) : mDelegate(other.mDelegate) { other.mDelegate = &mDefaultDelegate; }
+
+        Entry & operator=(Entry && other)
+        {
+            if (this != &other)
+            {
+                mDelegate->Release();
+                mDelegate       = other.mDelegate;
+                other.mDelegate = &mDefaultDelegate;
+            }
+            return *this;
+        }
+
         Entry(const Entry &) = delete;
         Entry & operator=(const Entry &) = delete;
 
@@ -292,9 +305,12 @@ class AccessControl
         virtual CHIP_ERROR Finish() { return CHIP_ERROR_NOT_IMPLEMENTED; }
 
         // Capabilities
-        virtual CHIP_ERROR GetMaxEntries(int & value) const { return CHIP_ERROR_NOT_IMPLEMENTED; }
+        virtual CHIP_ERROR GetMaxEntryCount(size_t & value) const { return CHIP_ERROR_NOT_IMPLEMENTED; }
         // TODO: more capabilities
 
+        // Actualities
+        virtual CHIP_ERROR GetEntryCount(size_t & value) const { return CHIP_ERROR_NOT_IMPLEMENTED; }
+
         // Preparation
         virtual CHIP_ERROR PrepareEntry(Entry & entry) { return CHIP_ERROR_NOT_IMPLEMENTED; }
 
@@ -352,7 +368,10 @@ class AccessControl
     CHIP_ERROR Finish();
 
     // Capabilities
-    CHIP_ERROR GetMaxEntries(int & value) const { return mDelegate.GetMaxEntries(value); }
+    CHIP_ERROR GetMaxEntryCount(size_t & value) const { return mDelegate.GetMaxEntryCount(value); }
+
+    // Actualities
+    CHIP_ERROR GetEntryCount(size_t & value) const { return mDelegate.GetEntryCount(value); }
 
     /**
      * Prepares an entry.

src/access/examples/ExampleAccessControlDelegate.cpp

@@ -968,12 +968,26 @@ class AccessControlDelegate : public AccessControl::Delegate
         return SaveToFlash();
     }
 
-    CHIP_ERROR GetMaxEntries(int & value) const override
+    CHIP_ERROR GetMaxEntryCount(size_t & value) const override
     {
         value = ArraySize(EntryStorage::acl);
         return CHIP_NO_ERROR;
     }
 
+    CHIP_ERROR GetEntryCount(size_t & value) const override
+    {
+        value = 0;
+        for (const auto & storage : EntryStorage::acl)
+        {
+            if (!storage.InUse())
+            {
+                break;
+            }
+            value++;
+        }
+        return CHIP_NO_ERROR;
+    }
+
     CHIP_ERROR PrepareEntry(Entry & entry) override
     {
         if (auto * delegate = EntryDelegate::Find(entry.GetDelegate()))

src/access/tests/TestAccessControl.cpp

@@ -110,7 +110,7 @@ struct EntryData
     NodeId subjects[kMaxSubjects] = { 0 };
     Target targets[kMaxTargets]   = { { 0 } };
 
-    void Clear() { memset(this, 0, sizeof(*this)); }
+    void Clear() { *this = EntryData(); }
 
     bool IsEmpty() const { return authMode == AuthMode::kNone; }
 

src/app/BUILD.gn

@@ -132,6 +132,7 @@ static_library("app") {
 
   public_deps = [
     ":app_buildconfig",
+    "${chip_root}/src/access",
     "${chip_root}/src/app/util:device_callbacks_manager",
     "${chip_root}/src/lib/support",
     "${chip_root}/src/messaging",