feat(nns): Support SelfDescribingValue::Null

rs/nns/governance/api/src/types.rs

@@ -4567,6 +4567,7 @@ pub enum SelfDescribingValue {
     Text(String),
     Nat(Nat),
     Int(Int),
+    Null,
     Array(Vec<SelfDescribingValue>),
     Map(HashMap<String, SelfDescribingValue>),
 }

rs/nns/governance/canister/governance.did

@@ -1480,6 +1480,7 @@ type SelfDescribingValue = variant {
   Int : int;
   Array : vec SelfDescribingValue;
   Map : vec record { text; SelfDescribingValue };
+  Null;
 };
 
 type GetPendingProposalsRequest = record {

rs/nns/governance/derive_self_describing/src/lib.rs

@@ -188,11 +188,11 @@ fn derive_mixed_enum(name: &Ident, data_enum: &DataEnum) -> Result<TokenStream2,
                     })
                 }
                 Fields::Unit => {
-                    // Unit variant in mixed enum: map with variant name as key, empty array as value
+                    // Unit variant in mixed enum: map with variant name as key, null value as value
                     Ok(quote! {
                         #name::#variant_name => {
                             crate::proposals::self_describing::ValueBuilder::new()
-                                .add_empty_field(#variant_name_str)
+                                .add_field(#variant_name_str, crate::proposals::self_describing::SelfDescribingValue::NULL)
                                 .build()
                         }
                     })

rs/nns/governance/proto/ic_nns_governance/pb/v1/governance.proto

@@ -2651,6 +2651,7 @@ message SelfDescribingValue {
     bytes int = 4;
     SelfDescribingValueArray array = 5;
     SelfDescribingValueMap map = 6;
+    Empty null = 7;
   }
 }
 

rs/nns/governance/src/gen/ic_nns_governance.pb.v1.rs

@@ -4138,7 +4138,7 @@ pub struct FinalizeDisburseMaturity {
     ::prost::Message,
 )]
 pub struct SelfDescribingValue {
-    #[prost(oneof = "self_describing_value::Value", tags = "1, 2, 3, 4, 5, 6")]
+    #[prost(oneof = "self_describing_value::Value", tags = "1, 2, 3, 4, 5, 6, 7")]
     pub value: ::core::option::Option<self_describing_value::Value>,
 }
 /// Nested message and enum types in `SelfDescribingValue`.
@@ -4166,6 +4166,8 @@ pub mod self_describing_value {
         Array(super::SelfDescribingValueArray),
         #[prost(message, tag = "6")]
         Map(super::SelfDescribingValueMap),
+        #[prost(message, tag = "7")]
+        Null(super::Empty),
     }
 }
 #[derive(

rs/nns/governance/src/pb/conversions/mod.rs

@@ -4202,6 +4202,7 @@ impl From<pb::SelfDescribingValue> for pb_api::SelfDescribingValue {
                     .map(|(k, v)| (k, Self::from(v)))
                     .collect(),
             ),
+            pb::self_describing_value::Value::Null(_) => Self::Null,
         }
     }
 }
@@ -4231,6 +4232,9 @@ impl From<pb_api::SelfDescribingValue> for pb::SelfDescribingValue {
                     values: v.into_iter().map(|(k, v)| (k, Self::from(v))).collect(),
                 })
             }
+            pb_api::SelfDescribingValue::Null => {
+                pb::self_describing_value::Value::Null(pb::Empty {})
+            }
         };
         Self { value: Some(value) }
     }

rs/nns/governance/src/proposals/add_or_remove_node_provider_tests.rs

@@ -281,9 +281,7 @@ fn test_to_self_describing_value() {
         SelfDescribingValue::Map(hashmap! {
             "ToAdd".to_string() => SelfDescribingValue::Map(hashmap! {
                 "id".to_string() => SelfDescribingValue::Text("6fyp7-3ibaa-aaaaa-aaaap-4ai".to_string()),
-                "reward_account".to_string() => SelfDescribingValue::Array(vec![
-                    SelfDescribingValue::Text(account.to_hex())
-                ])
+                "reward_account".to_string() => SelfDescribingValue::Text(account.to_hex())
             })
         })
     );

rs/nns/governance/src/proposals/deregister_known_neuron.rs

@@ -60,7 +60,7 @@ impl LocallyDescribableProposalAction for DeregisterKnownNeuron {
 
     fn to_self_describing_value(&self) -> SelfDescribingValue {
         ValueBuilder::new()
-            .add_field_with_empty_as_fallback("neuron_id", self.id.map(|id| id.id))
+            .add_field("neuron_id", self.id.map(|id| id.id))
             .build()
     }
 }

rs/nns/governance/src/proposals/install_code.rs

@@ -187,10 +187,10 @@ impl LocallyDescribableProposalAction for InstallCode {
         let install_mode = install_mode.map(SelfDescribingProstEnum::<CanisterInstallMode>::new);
 
         ValueBuilder::new()
-            .add_field_with_empty_as_fallback("canister_id", *canister_id)
-            .add_field_with_empty_as_fallback("install_mode", install_mode)
-            .add_field_with_empty_as_fallback("wasm_module_hash", wasm_module_hash.clone())
-            .add_field_with_empty_as_fallback("arg_hash", arg_hash.clone())
+            .add_field("canister_id", *canister_id)
+            .add_field("install_mode", install_mode)
+            .add_field("wasm_module_hash", wasm_module_hash.clone())
+            .add_field("arg_hash", arg_hash.clone())
             .add_field(
                 "skip_stopping_before_installing",
                 skip_stopping_before_installing.unwrap_or_default(),

rs/nns/governance/src/proposals/manage_neuron.rs

@@ -51,13 +51,11 @@ impl LocallyDescribableProposalAction for ManageNeuron {
                     "A ManageNeuron proposal is created with an empty or conflicting \
                     values of id and neuron_id_or_subaccount. This should never happen."
                 );
-                builder.add_empty_field("neuron_id_or_subaccount")
+                builder.add_field("neuron_id_or_subaccount", SelfDescribingValue::NULL)
             }
         };
 
-        builder
-            .add_field_with_empty_as_fallback("command", self.command.clone())
-            .build()
+        builder.add_field("command", self.command.clone()).build()
     }
 }
 
@@ -99,13 +97,13 @@ impl From<Command> for SelfDescribingValue {
                 println!(
                     "A ManageNeuron proposal is created with a MergeMaturity command. This should never happen."
                 );
-                Self::singleton_map("MergeMaturity", Self::EMPTY)
+                Self::singleton_map("MergeMaturity", Self::NULL)
             }
             C::MakeProposal(_) => {
                 println!(
                     "A ManageNeuron proposal is created with a MakeProposal command. This should never happen."
                 );
-                Self::singleton_map("MakeProposal", Self::EMPTY)
+                Self::singleton_map("MakeProposal", Self::NULL)
             }
         }
     }
@@ -117,7 +115,7 @@ impl From<Configure> for SelfDescribingValue {
             println!(
                 "A ManageNeuron proposal is created with an empty operation. This should never happen."
             );
-            return Self::EMPTY;
+            return Self::NULL;
         };
 
         use Operation as O;
@@ -161,14 +159,14 @@ impl From<IncreaseDissolveDelay> for SelfDescribingValue {
 impl From<StartDissolving> for SelfDescribingValue {
     fn from(value: StartDissolving) -> Self {
         let StartDissolving {} = value;
-        SelfDescribingValue::EMPTY
+        SelfDescribingValue::NULL
     }
 }
 
 impl From<StopDissolving> for SelfDescribingValue {
     fn from(value: StopDissolving) -> Self {
         let StopDissolving {} = value;
-        SelfDescribingValue::EMPTY
+        SelfDescribingValue::NULL
     }
 }
 
@@ -198,14 +196,14 @@ impl From<SetDissolveTimestamp> for SelfDescribingValue {
 impl From<JoinCommunityFund> for SelfDescribingValue {
     fn from(value: JoinCommunityFund) -> Self {
         let JoinCommunityFund {} = value;
-        SelfDescribingValue::EMPTY
+        SelfDescribingValue::NULL
     }
 }
 
 impl From<LeaveCommunityFund> for SelfDescribingValue {
     fn from(value: LeaveCommunityFund) -> Self {
         let LeaveCommunityFund {} = value;
-        SelfDescribingValue::EMPTY
+        SelfDescribingValue::NULL
     }
 }
 
@@ -320,7 +318,7 @@ impl From<ClaimOrRefresh> for SelfDescribingValue {
             println!(
                 "A ManageNeuron proposal is created with an empty by. This should never happen."
             );
-            return Self::EMPTY;
+            return Self::NULL;
         };
 
         match by {
@@ -359,7 +357,7 @@ impl From<Merge> for SelfDescribingValue {
 impl From<RefreshVotingPower> for SelfDescribingValue {
     fn from(value: RefreshVotingPower) -> Self {
         let RefreshVotingPower {} = value;
-        SelfDescribingValue::EMPTY
+        SelfDescribingValue::NULL
     }
 }