From 3960b690bf8c67afe706bb469b0ff2798424a26e Mon Sep 17 00:00:00 2001
From: Aaron Buchwald <aaron.buchwald56@gmail.com>
Date: Thu, 17 Dec 2020 13:58:14 -0500
Subject: Decrease minimum gas price at apricot upgrade

---
 plugin/evm/block.go | 20 +++++++++++++-------
 plugin/evm/vm.go    | 33 ++++++++++++++++++++++++++++-----
 2 files changed, 41 insertions(+), 12 deletions(-)

(limited to 'plugin/evm')

diff --git a/plugin/evm/block.go b/plugin/evm/block.go
index 5a0d377..08ef231 100644
--- a/plugin/evm/block.go
+++ b/plugin/evm/block.go
@@ -6,9 +6,9 @@ package evm
 import (
 	"errors"
 	"fmt"
+	"math/big"
 
 	"github.com/ava-labs/coreth/core/types"
-	"github.com/ava-labs/coreth/params"
 	"github.com/ethereum/go-ethereum/log"
 	"github.com/ethereum/go-ethereum/rlp"
 
@@ -85,9 +85,11 @@ func (b *Block) Verify() error {
 	// Only enforce a minimum fee when bootstrapping has finished
 	if b.vm.ctx.IsBootstrapped() {
 		// Ensure the minimum gas price is paid for every transaction
+		timestamp := b.ethBlock.Header().Time
+		minGasPrice := b.vm.minGasPrice.GetMin(new(big.Int).SetUint64(timestamp))
 		for _, tx := range b.ethBlock.Transactions() {
-			if tx.GasPrice().Cmp(params.MinGasPrice) < 0 {
-				return errInvalidBlock
+			if tx.GasPrice().Cmp(minGasPrice) < 0 {
+				return fmt.Errorf("block contains tx %s with gas price too low (%d < %d), timestamp: %d", tx.Hash(), tx.GasPrice(), minGasPrice, timestamp)
 			}
 		}
 	}
@@ -139,17 +141,21 @@ func (b *Block) Verify() error {
 		}
 
 		utx := tx.UnsignedTx.(UnsignedAtomicTx)
-		if utx.SemanticVerify(vm, tx) != nil {
-			return errInvalidBlock
+		if err := utx.SemanticVerify(vm, tx); err != nil {
+			return fmt.Errorf("block atomic tx failed verification due to: %w", err)
 		}
 		bc := vm.chain.BlockChain()
 		_, _, _, err = bc.Processor().Process(b.ethBlock, pState, *bc.GetVMConfig())
 		if err != nil {
-			return errInvalidBlock
+			return fmt.Errorf("block failed processing due to: %w", err)
 		}
 	}
 	_, err := b.vm.chain.InsertChain([]*types.Block{b.ethBlock})
-	return err
+	if err != nil {
+		return fmt.Errorf("failed to insert block into chain due to: %w", err)
+	}
+
+	return nil
 }
 
 // Bytes implements the snowman.Block interface
diff --git a/plugin/evm/vm.go b/plugin/evm/vm.go
index 9f5607a..ac1eb56 100644
--- a/plugin/evm/vm.go
+++ b/plugin/evm/vm.go
@@ -185,6 +185,8 @@ type VM struct {
 	shutdownWg   sync.WaitGroup
 
 	fx secp256k1fx.Fx
+
+	minGasPrice params.GasPrice
 }
 
 func (vm *VM) getAtomicTx(block *types.Block) *Tx {
@@ -262,13 +264,34 @@ func (vm *VM) Initialize(
 	config.Miner.ManualMining = true
 	config.Miner.DisableUncle = true
 
-	// Set minimum price for mining and default gas price oracle value to the min
-	// gas price to prevent so transactions and blocks all use the correct fees
-	config.Miner.GasPrice = params.MinGasPrice
+	// Set minimum gas price and launch goroutine to sleep until
+	// network upgrade when the gas price must be changed
+	vm.minGasPrice = params.NewGasPrice(g.Config.ApricotBlockTimestamp)
+	if g.Config.ApricotBlockTimestamp == nil {
+		config.Miner.GasPrice = params.ApricotMinGasPrice
+		config.GPO.Default = params.ApricotMinGasPrice
+		config.TxPool.PriceLimit = params.ApricotMinGasPrice.Uint64()
+	} else {
+		apricotTime := time.Unix(g.Config.ApricotBlockTimestamp.Int64(), 0)
+		if time.Now().Before(apricotTime) {
+			config.Miner.GasPrice = params.LaunchMinGasPrice
+			config.GPO.Default = params.LaunchMinGasPrice
+			config.TxPool.PriceLimit = params.LaunchMinGasPrice.Uint64()
+
+			go func() {
+				time.Sleep(time.Until(apricotTime))
+
+				vm.chain.SetGasPrice(params.ApricotMinGasPrice)
+			}()
+		} else {
+			config.Miner.GasPrice = params.ApricotMinGasPrice
+			config.GPO.Default = params.ApricotMinGasPrice
+			config.TxPool.PriceLimit = params.ApricotMinGasPrice.Uint64()
+		}
+	}
+
 	config.RPCGasCap = vm.CLIConfig.RPCGasCap
 	config.RPCTxFeeCap = vm.CLIConfig.RPCTxFeeCap
-	config.GPO.Default = params.MinGasPrice
-	config.TxPool.PriceLimit = params.MinGasPrice.Uint64()
 	config.TxPool.NoLocals = true
 
 	if err := config.SetGCMode("archive"); err != nil {
-- 
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