core: remove transaction priority

There is no such thing as high/low priority transactions, as there are
no free transactions anymore and they are ordered by fees contained
in transaction itself.

Closes #1063.

config/protocol.mainnet.yml

@@ -1,7 +1,6 @@
 ProtocolConfiguration:
   Magic: 5195086
   SecondsPerBlock: 15
-  LowPriorityThreshold: 0.001
   MemPoolSize: 50000
   StandbyValidators:
   - 03b209fd4f53a7170ea4444e0cb0a6bb6a53c2bd016926989cf85f9b0fba17a70c

config/protocol.privnet.docker.four.yml

@@ -1,7 +1,6 @@
 ProtocolConfiguration:
   Magic: 56753
   SecondsPerBlock: 15
-  LowPriorityThreshold: 0.000
   MemPoolSize: 50000
   StandbyValidators:
     - 02b3622bf4017bdfe317c58aed5f4c753f206b7db896046fa7d774bbc4bf7f8dc2

config/protocol.privnet.docker.one.yml

@@ -1,7 +1,6 @@
 ProtocolConfiguration:
   Magic: 56753
   SecondsPerBlock: 15
-  LowPriorityThreshold: 0.000
   MemPoolSize: 50000
   StandbyValidators:
     - 02b3622bf4017bdfe317c58aed5f4c753f206b7db896046fa7d774bbc4bf7f8dc2

config/protocol.privnet.docker.single.yml

@@ -1,7 +1,6 @@
 ProtocolConfiguration:
   Magic: 56753
   SecondsPerBlock: 1
-  LowPriorityThreshold: 0.001
   MemPoolSize: 50000
   StandbyValidators:
     - 02b3622bf4017bdfe317c58aed5f4c753f206b7db896046fa7d774bbc4bf7f8dc2

config/protocol.privnet.docker.three.yml

@@ -1,7 +1,6 @@
 ProtocolConfiguration:
   Magic: 56753
   SecondsPerBlock: 15
-  LowPriorityThreshold: 0.000
   MemPoolSize: 50000
   StandbyValidators:
     - 02b3622bf4017bdfe317c58aed5f4c753f206b7db896046fa7d774bbc4bf7f8dc2

config/protocol.privnet.docker.two.yml

@@ -1,7 +1,6 @@
 ProtocolConfiguration:
   Magic: 56753
   SecondsPerBlock: 15
-  LowPriorityThreshold: 0.000
   MemPoolSize: 50000
   StandbyValidators:
     - 02b3622bf4017bdfe317c58aed5f4c753f206b7db896046fa7d774bbc4bf7f8dc2

config/protocol.privnet.yml

@@ -1,7 +1,6 @@
 ProtocolConfiguration:
   Magic: 56753
   SecondsPerBlock: 15
-  LowPriorityThreshold: 0.000
   MemPoolSize: 50000
   StandbyValidators:
     - 02b3622bf4017bdfe317c58aed5f4c753f206b7db896046fa7d774bbc4bf7f8dc2

config/protocol.testnet.yml

@@ -1,7 +1,6 @@
 ProtocolConfiguration:
   Magic: 1951352142
   SecondsPerBlock: 15
-  LowPriorityThreshold: 0.000
   MemPoolSize: 50000
   StandbyValidators:
   - 023e9b32ea89b94d066e649b124fd50e396ee91369e8e2a6ae1b11c170d022256d

config/protocol.unit_testnet.yml

@@ -1,7 +1,6 @@
 ProtocolConfiguration:
   Magic: 42
   SecondsPerBlock: 15
-  LowPriorityThreshold: 0.000
   MemPoolSize: 50000
   StandbyValidators:
     - 02b3622bf4017bdfe317c58aed5f4c753f206b7db896046fa7d774bbc4bf7f8dc2

pkg/config/protocol_config.go

@@ -7,7 +7,6 @@ import (
 // ProtocolConfiguration represents the protocol config.
 type (
 	ProtocolConfiguration struct {
-		LowPriorityThreshold    float64       `yaml:"LowPriorityThreshold"`
 		Magic                   netmode.Magic `yaml:"Magic"`
 		MaxTransactionsPerBlock int           `yaml:"MaxTransactionsPerBlock"`
 		MemPoolSize             int           `yaml:"MemPoolSize"`

pkg/consensus/consensus_test.go

@@ -229,10 +229,6 @@ func newTestChain(t *testing.T) *core.Blockchain {
 	return chain
 }
 
-type feer struct{}
-
-func (fs *feer) IsLowPriority(util.Fixed8) bool { return false }
-
 var neoOwner = testchain.MultisigScriptHash()
 
 func addSender(t *testing.T, txs ...*transaction.Transaction) {

pkg/core/blockchain.go

@@ -1088,12 +1088,6 @@ func (bc *Blockchain) FeePerByte() util.Fixed8 {
 	return util.Fixed8(1000)
 }
 
-// IsLowPriority checks given fee for being less than configured
-// LowPriorityThreshold.
-func (bc *Blockchain) IsLowPriority(fee util.Fixed8) bool {
-	return fee < util.Fixed8FromFloat(bc.GetConfig().LowPriorityThreshold)
-}
-
 // GetMemPool returns the memory pool of the blockchain.
 func (bc *Blockchain) GetMemPool() *mempool.Pool {
 	return &bc.memPool

pkg/core/mempool/feer.go

@@ -6,7 +6,6 @@ import (
 
 // Feer is an interface that abstract the implementation of the fee calculation.
 type Feer interface {
-	IsLowPriority(util.Fixed8) bool
 	FeePerByte() util.Fixed8
 	GetUtilityTokenBalance(util.Uint160) util.Fixed8
 }

pkg/core/mempool/mem_pool.go

@@ -27,7 +27,6 @@ var (
 type item struct {
 	txn       *transaction.Transaction
 	timeStamp time.Time
-	isLowPrio bool
 }
 
 // items is a slice of item.
@@ -63,14 +62,6 @@ func (p *item) CompareTo(otherP *item) int {
 		return 1
 	}
 
-	if !p.isLowPrio && otherP.isLowPrio {
-		return 1
-	}
-
-	if p.isLowPrio && !otherP.isLowPrio {
-		return -1
-	}
-
 	// Fees sorted ascending.
 	if ret := p.txn.FeePerByte().CompareTo(otherP.txn.FeePerByte()); ret != 0 {
 		return ret
@@ -151,7 +142,6 @@ func (mp *Pool) Add(t *transaction.Transaction, fee Feer) error {
 		txn:       t,
 		timeStamp: time.Now().UTC(),
 	}
-	pItem.isLowPrio = fee.IsLowPriority(pItem.txn.NetworkFee)
 	mp.lock.Lock()
 	if !mp.checkTxConflicts(t, fee) {
 		mp.lock.Unlock()

pkg/core/mempool/mem_pool_test.go

@@ -13,12 +13,7 @@ import (
 )
 
 type FeerStub struct {
-	lowPriority bool
-	feePerByte  util.Fixed8
-}
-
-func (fs *FeerStub) IsLowPriority(util.Fixed8) bool {
-	return fs.lowPriority
+	feePerByte util.Fixed8
 }
 
 func (fs *FeerStub) FeePerByte() util.Fixed8 {
@@ -50,14 +45,12 @@ func testMemPoolAddRemoveWithFeer(t *testing.T, fs Feer) {
 }
 
 func TestMemPoolAddRemove(t *testing.T) {
-	var fs = &FeerStub{lowPriority: false}
-	t.Run("low priority", func(t *testing.T) { testMemPoolAddRemoveWithFeer(t, fs) })
-	fs.lowPriority = true
-	t.Run("high priority", func(t *testing.T) { testMemPoolAddRemoveWithFeer(t, fs) })
+	var fs = &FeerStub{}
+	testMemPoolAddRemoveWithFeer(t, fs)
 }
 
 func TestOverCapacity(t *testing.T) {
-	var fs = &FeerStub{lowPriority: true}
+	var fs = &FeerStub{}
 	const mempoolSize = 10
 	mp := NewMemPool(mempoolSize)
 
@@ -110,9 +103,9 @@ func TestOverCapacity(t *testing.T) {
 	require.Equal(t, true, sort.IsSorted(sort.Reverse(mp.verifiedTxes)))
 
 	// High priority always wins over low priority.
-	fs.lowPriority = false
 	for i := 0; i < mempoolSize; i++ {
 		tx := transaction.New(netmode.UnitTestNet, []byte{byte(opcode.PUSH1)}, 0)
+		tx.NetworkFee = util.Fixed8FromFloat(0.00008)
 		tx.Nonce = txcnt
 		txcnt++
 		require.NoError(t, mp.Add(tx, fs))
@@ -120,16 +113,16 @@ func TestOverCapacity(t *testing.T) {
 		require.Equal(t, true, sort.IsSorted(sort.Reverse(mp.verifiedTxes)))
 	}
 	// Good luck with low priority now.
-	fs.lowPriority = true
 	tx = transaction.New(netmode.UnitTestNet, []byte{byte(opcode.PUSH1)}, 0)
 	tx.Nonce = txcnt
+	tx.NetworkFee = util.Fixed8FromFloat(0.00007)
 	require.Error(t, mp.Add(tx, fs))
 	require.Equal(t, mempoolSize, mp.Count())
 	require.Equal(t, true, sort.IsSorted(sort.Reverse(mp.verifiedTxes)))
 }
 
 func TestGetVerified(t *testing.T) {
-	var fs = &FeerStub{lowPriority: true}
+	var fs = &FeerStub{}
 	const mempoolSize = 10
 	mp := NewMemPool(mempoolSize)
 
@@ -152,7 +145,7 @@ func TestGetVerified(t *testing.T) {
 }
 
 func TestRemoveStale(t *testing.T) {
-	var fs = &FeerStub{lowPriority: true}
+	var fs = &FeerStub{}
 	const mempoolSize = 10
 	mp := NewMemPool(mempoolSize)
 

pkg/network/helper_test.go

@@ -123,10 +123,6 @@ func (chain testChain) GetMemPool() *mempool.Pool {
 	panic("TODO")
 }
 
-func (chain testChain) IsLowPriority(util.Fixed8) bool {
-	panic("TODO")
-}
-
 func (chain testChain) GetGoverningTokenBalance(acc util.Uint160) (util.Fixed8, uint32) {
 	panic("TODO")
 }

pkg/rpc/server/server_helper_test.go

@@ -85,10 +85,6 @@ func initServerWithInMemoryChain(t *testing.T) (*core.Blockchain, *Server, *http
 
 type FeerStub struct{}
 
-func (fs *FeerStub) IsLowPriority(util.Fixed8) bool {
-	return false
-}
-
 func (fs *FeerStub) FeePerByte() util.Fixed8 {
 	return 0
 }