feat(rpc): internal method Forest.BaseFeeByHeight for troubleshooting

src/rpc/methods/eth.rs

@@ -835,6 +835,23 @@ impl RpcMethod<0> for EthAccounts {
 }
 
 pub enum EthBaseFee {}
+
+impl EthBaseFee {
+    fn get_base_fee(ctx: &Ctx, ts: &Tipset) -> anyhow::Result<TokenAmount> {
+        let heights = &ctx.chain_config().height_infos;
+        let smoke_height = heights
+            .get(&Height::Smoke)
+            .context("Missing Smoke height")?
+            .epoch;
+        let firehorse_height = heights
+            .get(&Height::FireHorse)
+            .context("Missing FireHorse height")?
+            .epoch;
+        compute_base_fee(ctx.db(), ts, smoke_height, firehorse_height)
+            .context("failed to compute base fee for eth_baseFee")
+    }
+}
+
 impl RpcMethod<0> for EthBaseFee {
     const NAME: &'static str = "Filecoin.EthBaseFee";
     const NAME_ALIAS: Option<&'static str> = Some("eth_baseFee");
@@ -852,18 +869,36 @@ impl RpcMethod<0> for EthBaseFee {
         (): Self::Params,
         _: &http::Extensions,
     ) -> Result<Self::Ok, ServerError> {
-        let ts = ctx.chain_store().heaviest_tipset();
-        let heights = &ctx.chain_config().height_infos;
-        let smoke_height = heights
-            .get(&Height::Smoke)
-            .context("Missing Smoke height")?
-            .epoch;
-        let firehorse_height = heights
-            .get(&Height::FireHorse)
-            .context("Missing FireHorse height")?
-            .epoch;
-        let base_fee = compute_base_fee(ctx.db(), &ts, smoke_height, firehorse_height)
-            .context("failed to compute base fee for eth_baseFee")?;
+        let base_fee = Self::get_base_fee(&ctx, &ctx.chain_store().heaviest_tipset())?;
+        Ok(EthBigInt(base_fee.atto().clone()))
+    }
+}
+
+pub enum BaseFeeByHeight {}
+impl RpcMethod<1> for BaseFeeByHeight {
+    const NAME: &'static str = "Forest.BaseFeeByHeight";
+    const NAME_ALIAS: Option<&'static str> = None;
+    const PARAM_NAMES: [&'static str; 1] = ["height"];
+    const API_PATHS: BitFlags<ApiPaths> = ApiPaths::all_with_v2();
+    const PERMISSION: Permission = Permission::Read;
+    const DESCRIPTION: Option<&'static str> = Some(
+        "Returns the calculated upcoming base fee of the tipset at the given height in attoFIL",
+    );
+
+    type Params = (ChainEpoch,);
+    type Ok = EthBigInt;
+
+    async fn handle(
+        ctx: Ctx,
+        (height,): Self::Params,
+        _: &http::Extensions,
+    ) -> Result<Self::Ok, ServerError> {
+        let ts = ctx.chain_index().load_required_tipset_by_height(
+            height,
+            ctx.chain_store().heaviest_tipset(),
+            ResolveNullTipset::TakeOlder,
+        )?;
+        let base_fee = EthBaseFee::get_base_fee(&ctx, &ts)?;
         Ok(EthBigInt(base_fee.atto().clone()))
     }
 }

src/rpc/mod.rs

@@ -107,6 +107,7 @@ macro_rules! for_each_rpc_method {
         $callback!($crate::rpc::eth::EthAddressToFilecoinAddress);
         $callback!($crate::rpc::eth::FilecoinAddressToEthAddress);
         $callback!($crate::rpc::eth::EthBaseFee);
+        $callback!($crate::rpc::eth::BaseFeeByHeight);
         $callback!($crate::rpc::eth::EthBlockNumber);
         $callback!($crate::rpc::eth::EthCall);
         $callback!($crate::rpc::eth::EthChainId);

src/tool/subcommands/api_cmd/test_snapshots_ignored.txt

@@ -77,6 +77,7 @@ Filecoin.WalletSetDefault
 Filecoin.WalletSign
 Filecoin.WalletSignMessage
 Filecoin.Web3ClientVersion
+Forest.BaseFeeByHeight
 Forest.ChainExport
 Forest.ChainExportCancel
 Forest.ChainExportDiff