graphql: fee history fields (#24452)

This PR adds the `NextBaseFeePerGas` to `Block` and `EffectiveTip` to `Transaction` to make it easier for clients to compute fee history themselves via graphql queries.

eth/gasprice/feehistory.go

@@ -117,7 +117,7 @@ func (oracle *Oracle) processBlock(bf *blockFees, percentiles []float64) {
 		reward, _ := tx.EffectiveGasTip(bf.block.BaseFee())
 		sorter[i] = txGasAndReward{gasUsed: bf.receipts[i].GasUsed, reward: reward}
 	}
-	sort.Sort(sorter)
+	sort.Stable(sorter)
 
 	var txIndex int
 	sumGasUsed := sorter[0].gasUsed

graphql/graphql.go

@@ -28,6 +28,7 @@ import (
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/common/hexutil"
 	"github.com/ethereum/go-ethereum/common/math"
+	"github.com/ethereum/go-ethereum/consensus/misc"
 	"github.com/ethereum/go-ethereum/core/state"
 	"github.com/ethereum/go-ethereum/core/types"
 	"github.com/ethereum/go-ethereum/eth/filters"
@@ -253,6 +254,10 @@ func (t *Transaction) EffectiveGasPrice(ctx context.Context) (*hexutil.Big, erro
 	if err != nil || tx == nil {
 		return nil, err
 	}
+	// Pending tx
+	if t.block == nil {
+		return nil, nil
+	}
 	header, err := t.block.resolveHeader(ctx)
 	if err != nil || header == nil {
 		return nil, err
@@ -293,6 +298,30 @@ func (t *Transaction) MaxPriorityFeePerGas(ctx context.Context) (*hexutil.Big, e
 	}
 }
 
+func (t *Transaction) EffectiveTip(ctx context.Context) (*hexutil.Big, error) {
+	tx, err := t.resolve(ctx)
+	if err != nil || tx == nil {
+		return nil, err
+	}
+	// Pending tx
+	if t.block == nil {
+		return nil, nil
+	}
+	header, err := t.block.resolveHeader(ctx)
+	if err != nil || header == nil {
+		return nil, err
+	}
+	if header.BaseFee == nil {
+		return (*hexutil.Big)(tx.GasPrice()), nil
+	}
+
+	tip, err := tx.EffectiveGasTip(header.BaseFee)
+	if err != nil {
+		return nil, err
+	}
+	return (*hexutil.Big)(tip), nil
+}
+
 func (t *Transaction) Value(ctx context.Context) (hexutil.Big, error) {
 	tx, err := t.resolve(ctx)
 	if err != nil || tx == nil {
@@ -606,6 +635,22 @@ func (b *Block) BaseFeePerGas(ctx context.Context) (*hexutil.Big, error) {
 	return (*hexutil.Big)(header.BaseFee), nil
 }
 
+func (b *Block) NextBaseFeePerGas(ctx context.Context) (*hexutil.Big, error) {
+	header, err := b.resolveHeader(ctx)
+	if err != nil {
+		return nil, err
+	}
+	chaincfg := b.backend.ChainConfig()
+	if header.BaseFee == nil {
+		// Make sure next block doesn't enable EIP-1559
+		if !chaincfg.IsLondon(new(big.Int).Add(header.Number, common.Big1)) {
+			return nil, nil
+		}
+	}
+	nextBaseFee := misc.CalcBaseFee(chaincfg, header)
+	return (*hexutil.Big)(nextBaseFee), nil
+}
+
 func (b *Block) Parent(ctx context.Context) (*Block, error) {
 	if _, err := b.resolveHeader(ctx); err != nil {
 		return nil, err

graphql/schema.go

@@ -98,6 +98,8 @@ const schema string = `
         maxFeePerGas: BigInt
         # MaxPriorityFeePerGas is the maximum miner tip per gas offered to include a transaction, in wei.
         maxPriorityFeePerGas: BigInt
+        # EffectiveTip is the actual amount of reward going to miner after considering the max fee cap.
+        effectiveTip: BigInt
         # Gas is the maximum amount of gas this transaction can consume.
         gas: Long!
         # InputData is the data supplied to the target of the transaction.
@@ -187,8 +189,10 @@ const schema string = `
         gasLimit: Long!
         # GasUsed is the amount of gas that was used executing transactions in this block.
         gasUsed: Long!
-        # BaseFeePerGas is the fee perunit of gas burned by the protocol in this block.
+        # BaseFeePerGas is the fee per unit of gas burned by the protocol in this block.
         baseFeePerGas: BigInt
+        # NextBaseFeePerGas is the fee per unit of gas which needs to be burned in the next block.
+        nextBaseFeePerGas: BigInt
         # Timestamp is the unix timestamp at which this block was mined.
         timestamp: Long!
         # LogsBloom is a bloom filter that can be used to check if a block may