fix(node): skip power scale if not collateral based

fendermint/app/options/src/genesis.rs

@@ -235,7 +235,8 @@ pub struct GenesisFromParentArgs {
     #[arg(long, short = 'f', value_parser = parse_token_amount, default_value = "1000")]
     pub base_fee: TokenAmount,
 
-    /// Number of decimals to use during converting FIL to Power.
-    #[arg(long, default_value = "3")]
-    pub power_scale: i8,
+    /// Number of decimals to use during converting FIL to Power. Only configurable if the subnet
+    /// is collateral based.
+    #[arg(long, default_value = "Some(3)")]
+    pub power_scale: Option<i8>,
 }

fendermint/app/src/cmd/genesis.rs

@@ -4,15 +4,16 @@
 use anyhow::{anyhow, Context};
 use fendermint_crypto::PublicKey;
 use fvm_shared::address::Address;
+use fvm_shared::econ::TokenAmount;
 use ipc_provider::config::subnet::{EVMSubnet, SubnetConfig};
 use ipc_provider::IpcProvider;
 use std::path::PathBuf;
 
 use fendermint_vm_actor_interface::eam::EthAddress;
 use fendermint_vm_core::Timestamp;
 use fendermint_vm_genesis::{
-    ipc, Account, Actor, ActorMeta, Collateral, Genesis, Multisig, PermissionMode, SignerAddr,
-    Validator, ValidatorKey,
+    ipc, Account, Actor, ActorMeta, Collateral, Genesis, Multisig, PermissionMode, PowerScale,
+    SignerAddr, Validator, ValidatorKey,
 };
 use fendermint_vm_interpreter::genesis::{GenesisAppState, GenesisBuilder};
 
@@ -21,6 +22,8 @@ use crate::options::genesis::*;
 
 use super::key::read_public_key;
 
+const DEFAULT_POWER_SCALE: PowerScale = 3;
+
 cmd! {
   GenesisArgs(self) {
     let genesis_file = self.genesis_file.clone();
@@ -339,6 +342,15 @@ async fn new_genesis_from_parent(
 
     let genesis_info = parent_provider.get_genesis_info(&args.subnet_id).await?;
 
+    let power_scale = if matches!(
+        genesis_info.permission_mode,
+        ipc_api::subnet::PermissionMode::Collateral
+    ) {
+        args.power_scale.unwrap_or(DEFAULT_POWER_SCALE)
+    } else {
+        TokenAmount::DECIMALS as PowerScale
+    };
+
     // get gateway genesis
     let ipc_params = ipc::IpcParams {
         gateway: ipc::GatewayParams {
@@ -357,7 +369,7 @@ async fn new_genesis_from_parent(
         chain_name: args.subnet_id.to_string(),
         network_version: args.network_version,
         base_fee: args.base_fee.clone(),
-        power_scale: args.power_scale,
+        power_scale,
         validators: Vec::new(),
         accounts: Vec::new(),
         eam_permission_mode: PermissionMode::Unrestricted,

fendermint/vm/genesis/src/lib.rs

@@ -285,7 +285,7 @@ mod tests {
     use num_traits::Num;
     use quickcheck_macros::quickcheck;
 
-    use crate::{Collateral, Genesis};
+    use crate::{Collateral, Genesis, PowerScale};
 
     #[quickcheck]
     fn genesis_json(value0: Genesis) {
@@ -332,6 +332,13 @@ mod tests {
         }
     }
 
+    #[test]
+    fn power_scale_18_decimals() {
+        let c = Collateral(TokenAmount::from_atto(1000));
+        let p = c.into_power(TokenAmount::DECIMALS as PowerScale);
+        assert_eq!(p.0, 1000);
+    }
+
     #[test]
     fn atto_per_power() {
         // Collateral given in atto (18 digits after the decimal)

fendermint/vm/interpreter/src/fvm/state/ipc.rs

@@ -175,7 +175,7 @@ impl<DB: Blockstore + Clone> GatewayCaller<DB> {
             .current_membership(state)
             .context("failed to get current membership")?;
 
-        let power_table = membership_to_power_table(&membership, state.power_scale());
+        let power_table = membership_to_power_table(&membership, state.power_scale())?;
 
         Ok((membership.configuration_number, power_table))
     }
@@ -347,19 +347,57 @@ pub fn tokens_to_burn(msgs: &[checkpointing_facet::IpcEnvelope]) -> TokenAmount
 fn membership_to_power_table(
     m: &gateway_getter_facet::Membership,
     power_scale: PowerScale,
-) -> Vec<Validator<Power>> {
+) -> anyhow::Result<Vec<Validator<Power>>> {
     let mut pt = Vec::new();
 
     for v in m.validators.iter() {
         // Ignoring any metadata that isn't a public key.
-        if let Ok(pk) = PublicKey::parse_slice(&v.metadata, None) {
-            let c = from_eth::to_fvm_tokens(&v.weight);
-            pt.push(Validator {
-                public_key: ValidatorKey(pk),
-                power: Collateral(c).into_power(power_scale),
-            })
-        }
+        let Ok(pk) = PublicKey::parse_slice(&v.metadata, None) else {
+            return Err(anyhow!(
+                "metadata not correct public key: {}",
+                hex::encode(&v.metadata)
+            ));
+        };
+
+        let c = from_eth::to_fvm_tokens(&v.weight);
+        pt.push(Validator {
+            public_key: ValidatorKey(pk),
+            power: Collateral(c).into_power(power_scale),
+        })
     }
 
-    pt
+    Ok(pt)
+}
+
+#[cfg(test)]
+mod tests {
+    use crate::fvm::state::ipc::membership_to_power_table;
+    use fendermint_vm_genesis::PowerScale;
+    use fvm_shared::econ::TokenAmount;
+    use ipc_actors_abis::gateway_getter_facet::gateway_getter_facet;
+    use std::str::FromStr;
+
+    #[test]
+    fn test_membership_to_power_table() {
+        let m = gateway_getter_facet::Membership {
+            configuration_number: 4,
+            validators: vec![
+                gateway_getter_facet::Validator {
+                    weight: ethers::types::U256::from(1),
+                    addr: ethers::types::Address::from_str("0x489Ee71B9E8eDEabB30eBA1b09De783Ee9B85F6B").unwrap(),
+                    metadata: ethers::types::Bytes::from_str("0x0485ff6016b937c0cec4f77cc452d250901aa8ff601faba7f4153a34c94ef9cdd8305e9432be8f94036d243dc1d8d5d0526d656ad179d252cf4dfdb49c78c47c65").unwrap(),
+                },
+                gateway_getter_facet::Validator {
+                    weight: ethers::types::U256::from(1000),
+                    addr: ethers::types::Address::from_str("0x0b18D28e32B2A24e003769960e4F3E262b176399").unwrap(),
+                    metadata: ethers::types::Bytes::from_str("0x0485ff6016b937c0cec4f77cc452d250901aa8ff601faba7f4153a34c94ef9cdd8305e9432be8f94036d243dc1d8d5d0526d656ad179d252cf4dfdb49c78c47c65").unwrap(),
+                },
+            ],
+        };
+
+        let v = membership_to_power_table(&m, TokenAmount::DECIMALS as PowerScale).unwrap();
+
+        assert_eq!(v[0].power.0, 1);
+        assert_eq!(v[1].power.0, 1000);
+    }
 }

ipc/api/src/subnet.rs

@@ -7,6 +7,7 @@
 /// However, we should either deprecate the native actors, or make
 /// them use the types from this sdk directly.
 use crate::subnet_id::SubnetID;
+use anyhow::anyhow;
 use fvm_ipld_encoding::repr::*;
 use fvm_shared::{address::Address, clock::ChainEpoch, econ::TokenAmount};
 use serde::{Deserialize, Serialize};
@@ -97,3 +98,16 @@ pub struct ConstructParams {
 pub enum ConsensusType {
     Fendermint,
 }
+
+impl TryFrom<u8> for PermissionMode {
+    type Error = anyhow::Error;
+
+    fn try_from(value: u8) -> Result<Self, Self::Error> {
+        Ok(match value {
+            0 => PermissionMode::Collateral,
+            1 => PermissionMode::Federated,
+            2 => PermissionMode::Static,
+            _ => return Err(anyhow!("unknown power permission mode")),
+        })
+    }
+}

ipc/provider/src/manager/evm/manager.rs

@@ -761,6 +761,8 @@ impl SubnetManager for EthSubnetManager {
 
         let genesis_balances = contract.genesis_balances().await?;
         let bottom_up_checkpoint_period = contract.bottom_up_check_period().call().await?.as_u64();
+        let permission_mode =
+            PermissionMode::try_from(contract.permission_mode().call().await? as u8)?;
 
         Ok(SubnetGenesisInfo {
             // Active validators limit set for the child subnet.
@@ -776,8 +778,7 @@ impl SubnetManager for EthSubnetManager {
             // Custom message fee that the child subnet wants to set for cross-net messages
             validators: from_contract_validators(contract.genesis_validators().call().await?)?,
             genesis_balances: into_genesis_balance_map(genesis_balances.0, genesis_balances.1)?,
-            // TODO: fixme https://github.com/consensus-shipyard/ipc-monorepo/issues/496
-            permission_mode: PermissionMode::Collateral,
+            permission_mode,
             supply_source: Asset {
                 kind: AssetKind::Native,
                 token_address: None,