Merge pull request #9451 from Juneezee/minmax

refactor: replace min/max helpers with built-in min/max

autopilot/simple_graph.go

@@ -85,9 +85,7 @@ func NewSimpleGraph(g ChannelGraph) (*SimpleGraph, error) {
 func maxVal(mapping map[int]uint32) uint32 {
 	maxValue := uint32(0)
 	for _, value := range mapping {
-		if maxValue < value {
-			maxValue = value
-		}
+		maxValue = max(maxValue, value)
 	}
 	return maxValue
 }

contractcourt/commit_sweep_resolver.go

@@ -4,7 +4,6 @@ import (
 	"encoding/binary"
 	"fmt"
 	"io"
-	"math"
 	"sync"
 
 	"github.com/btcsuite/btcd/btcutil"
@@ -391,9 +390,7 @@ func (c *commitSweepResolver) Launch() error {
 	// expires after.
 	unlockHeight := confHeight + c.commitResolution.MaturityDelay
 	if c.hasCLTV() {
-		unlockHeight = uint32(math.Max(
-			float64(unlockHeight), float64(c.leaseExpiry),
-		))
+		unlockHeight = max(unlockHeight, c.leaseExpiry)
 	}
 
 	// Update report now that we learned the confirmation height.

contractcourt/htlc_lease_resolver.go

@@ -1,8 +1,6 @@
 package contractcourt
 
 import (
-	"math"
-
 	"github.com/btcsuite/btcd/wire"
 	"github.com/lightningnetwork/lnd/chainntnfs"
 	"github.com/lightningnetwork/lnd/channeldb"
@@ -42,9 +40,7 @@ func (h *htlcLeaseResolver) deriveWaitHeight(csvDelay uint32,
 
 	waitHeight := uint32(commitSpend.SpendingHeight) + csvDelay - 1
 	if h.hasCLTV() {
-		waitHeight = uint32(math.Max(
-			float64(waitHeight), float64(h.leaseExpiry),
-		))
+		waitHeight = max(waitHeight, h.leaseExpiry)
 	}
 
 	return waitHeight

docs/release-notes/release-notes-0.19.0.md

@@ -329,6 +329,9 @@ The underlying functionality between those two options remain the same.
   to the sweeper to improve code quality, with a renaming of the internal state
   (`Failed` -> `Fatal`) used by the inputs tracked in the sweeper.
 
+* A code refactor that [replaces min/max helpers with built-in min/max
+  functions](https://github.com/lightningnetwork/lnd/pull/9451).
+
 ## Tooling and Documentation
 
 * [Improved `lncli create` command help text](https://github.com/lightningnetwork/lnd/pull/9077)

lntypes/comparison.go

@@ -1,26 +0,0 @@
-package lntypes
-
-import "golang.org/x/exp/constraints"
-
-// Number defines a type constraint for numbers.
-type Number interface {
-	constraints.Integer | constraints.Float
-}
-
-// Max returns the greater of the two inputs.
-func Max[N Number](op1 N, op2 N) N {
-	if op1 > op2 {
-		return op1
-	}
-
-	return op2
-}
-
-// Min returns the lesser of the two inputs.
-func Min[N Number](op1 N, op2 N) N {
-	if op1 < op2 {
-		return op1
-	}
-
-	return op2
-}

lntypes/comparison_test.go

@@ -1,25 +0,0 @@
-package lntypes
-
-import (
-	"testing"
-
-	"github.com/stretchr/testify/require"
-)
-
-// TestMin tests getting correct minimal numbers.
-func TestMin(t *testing.T) {
-	t.Parallel()
-
-	require.Equal(t, 1, Min(1, 1))
-	require.Equal(t, 1, Min(1, 2))
-	require.Equal(t, 1.5, Min(1.5, 2.5))
-}
-
-// TestMax tests getting correct maximal numbers.
-func TestMax(t *testing.T) {
-	t.Parallel()
-
-	require.Equal(t, 1, Max(1, 1))
-	require.Equal(t, 2, Max(1, 2))
-	require.Equal(t, 2.5, Max(1.5, 2.5))
-}

lnwallet/channel.go

@@ -7,7 +7,6 @@ import (
 	"crypto/sha256"
 	"errors"
 	"fmt"
-	"math"
 	"slices"
 	"sync"
 
@@ -9512,7 +9511,7 @@ func (lc *LightningChannel) MaxFeeRate(
 	// rather than us decreasing in local balance. The max fee rate is
 	// always floored by the current fee rate of the channel.
 	idealMaxFee := float64(baseBalance) * maxAllocation
-	maxFee := math.Max(float64(currentFee), idealMaxFee)
+	maxFee := max(float64(currentFee), idealMaxFee)
 	maxFeeAllocation := maxFee / float64(baseBalance)
 	maxFeeRate := chainfee.SatPerKWeight(maxFee / (float64(weight) / 1000))
 
@@ -9538,17 +9537,10 @@ func (lc *LightningChannel) IdealCommitFeeRate(netFeeRate, minRelayFeeRate,
 	switch lc.channelState.ChanType.HasAnchors() &&
 		maxFeeRate > maxAnchorCommitFeeRate {
 	case true:
-		commitFeeRate = chainfee.SatPerKWeight(
-			math.Min(
-				float64(netFeeRate),
-				float64(maxAnchorCommitFeeRate),
-			),
-		)
+		commitFeeRate = min(netFeeRate, maxAnchorCommitFeeRate)
 
 	case false:
-		commitFeeRate = chainfee.SatPerKWeight(
-			math.Min(float64(netFeeRate), float64(maxFeeRate)),
-		)
+		commitFeeRate = min(netFeeRate, maxFeeRate)
 	}
 
 	if commitFeeRate >= minRelayFeeRate {

routing/unified_edges.go

@@ -6,7 +6,6 @@ import (
 	"github.com/btcsuite/btcd/btcutil"
 	graphdb "github.com/lightningnetwork/lnd/graph/db"
 	"github.com/lightningnetwork/lnd/graph/db/models"
-	"github.com/lightningnetwork/lnd/lntypes"
 	"github.com/lightningnetwork/lnd/lnwire"
 	"github.com/lightningnetwork/lnd/routing/route"
 )
@@ -379,13 +378,11 @@ func (u *edgeUnifier) getEdgeNetwork(netAmtReceived lnwire.MilliSatoshi,
 
 			capMsat = edge.policy.MaxHTLC
 		}
-		maxCapMsat = lntypes.Max(capMsat, maxCapMsat)
+		maxCapMsat = max(capMsat, maxCapMsat)
 
 		// Track the maximum time lock of all channels that are
 		// candidate for non-strict forwarding at the routing node.
-		maxTimelock = lntypes.Max(
-			maxTimelock, edge.policy.TimeLockDelta,
-		)
+		maxTimelock = max(maxTimelock, edge.policy.TimeLockDelta)
 
 		outboundFee := int64(edge.policy.ComputeFee(amt))
 		fee := outboundFee + inboundFee
@@ -440,10 +437,10 @@ func (u *edgeUnifier) getEdgeNetwork(netAmtReceived lnwire.MilliSatoshi,
 
 // minAmt returns the minimum amount that can be forwarded on this connection.
 func (u *edgeUnifier) minAmt() lnwire.MilliSatoshi {
-	min := lnwire.MaxMilliSatoshi
+	minAmount := lnwire.MaxMilliSatoshi
 	for _, edge := range u.edges {
-		min = lntypes.Min(min, edge.policy.MinHTLC)
+		minAmount = min(minAmount, edge.policy.MinHTLC)
 	}
 
-	return min
+	return minAmount
 }

sqldb/interfaces.go

@@ -183,7 +183,7 @@ func randRetryDelay(initialRetryDelay, maxRetryDelay time.Duration,
 	// attempt. If we double something n times, that's the same as
 	// multiplying the value with 2^n. We limit the power to 32 to avoid
 	// overflows.
-	factor := time.Duration(math.Pow(2, math.Min(float64(attempt), 32)))
+	factor := time.Duration(math.Pow(2, min(float64(attempt), 32)))
 	actualDelay := initialDelay * factor
 
 	// Cap the delay at the maximum configured value.

watchtower/wtdb/migration4/range_index.go

@@ -74,24 +74,6 @@ func (a *RangeIndex) addRange(start, end uint64) error {
 			"than end height %d", start, end)
 	}
 
-	// min is a helper closure that will return the minimum of two uint64s.
-	min := func(a, b uint64) uint64 {
-		if a < b {
-			return a
-		}
-
-		return b
-	}
-
-	// max is a helper closure that will return the maximum of two uint64s.
-	max := func(a, b uint64) uint64 {
-		if a > b {
-			return a
-		}
-
-		return b
-	}
-
 	// Collect the ranges that fall before and after the new range along
 	// with the start and end values of the new range.
 	var before, after []rangeItem

watchtower/wtdb/migration8/range_index.go

@@ -74,24 +74,6 @@ func (a *RangeIndex) addRange(start, end uint64) error {
 			"than end height %d", start, end)
 	}
 
-	// min is a helper closure that will return the minimum of two uint64s.
-	min := func(a, b uint64) uint64 {
-		if a < b {
-			return a
-		}
-
-		return b
-	}
-
-	// max is a helper closure that will return the maximum of two uint64s.
-	max := func(a, b uint64) uint64 {
-		if a > b {
-			return a
-		}
-
-		return b
-	}
-
 	// Collect the ranges that fall before and after the new range along
 	// with the start and end values of the new range.
 	var before, after []rangeItem

watchtower/wtdb/range_index.go

@@ -74,24 +74,6 @@ func (a *RangeIndex) addRange(start, end uint64) error {
 			"than end height %d", start, end)
 	}
 
-	// min is a helper closure that will return the minimum of two uint64s.
-	min := func(a, b uint64) uint64 {
-		if a < b {
-			return a
-		}
-
-		return b
-	}
-
-	// max is a helper closure that will return the maximum of two uint64s.
-	max := func(a, b uint64) uint64 {
-		if a > b {
-			return a
-		}
-
-		return b
-	}
-
 	// Collect the ranges that fall before and after the new range along
 	// with the start and end values of the new range.
 	var before, after []rangeItem