Feature/go 1.21 (#4)

* Set Go version to 1.21

---------

Signed-off-by: Gleb Kogtev <gleb.kogtev@gmail.com>

.github/workflows/ci.yaml

@@ -28,7 +28,7 @@ jobs:
       - uses: actions/checkout@v2
       - uses: actions/setup-go@v1
         with:
-          go-version: 1.22
+          go-version: 1.21
       - run: |
           go build -race  ./...
   test:
@@ -38,7 +38,7 @@ jobs:
       - uses: actions/checkout@v2
       - uses: actions/setup-go@v1
         with:
-          go-version: 1.22
+          go-version: 1.21
       - name: Install gotestsum
         run: go install gotest.tools/gotestsum@v0.4.0
       - name: Run tests
@@ -68,7 +68,7 @@ jobs:
       - uses: actions/checkout@v2
       - uses: actions/setup-go@v1
         with:
-          go-version: 1.22
+          go-version: 1.21
       - name: build coredns binary
         run: |
           go build -o coredns/coredns coredns/main.go
@@ -111,7 +111,7 @@ jobs:
       - uses: actions/checkout@v2
       - uses: actions/setup-go@v1
         with:
-          go-version: 1.22
+          go-version: 1.21
       - run: go mod tidy
       - name: Check for changes in go.mod or go.sum
         run: |
@@ -124,7 +124,7 @@ jobs:
       - uses: actions/checkout@v2
       - uses: actions/setup-go@v1
         with:
-          go-version: 1.22
+          go-version: 1.21
       - name: Install go-header
         run: 'go install github.com/denis-tingajkin/go-header@v0.2.2'
       - name: Run go-header

.github/workflows/push.yaml

@@ -18,7 +18,7 @@ jobs:
 
       - uses: actions/setup-go@v1
         with:
-          go-version: 1.22
+          go-version: 1.21
       - name: "Build coredns binary"
         run: |
           go build -o coredns/coredns coredns/main.go

.github/workflows/release.yaml

@@ -46,7 +46,7 @@ jobs:
 
       - uses: actions/setup-go@v1
         with:
-          go-version: 1.22
+          go-version: 1.21
       - name: "Build coredns binary"
         run: |
           go build -o coredns/coredns coredns/main.go

coredns/go.mod

@@ -1,6 +1,6 @@
 module github.com/networkservicemesh/fanout/coredns
 
-go 1.22
+go 1.21
 
 require (
 	github.com/coredns/coredns v1.11.3

fanout.go

@@ -124,7 +124,7 @@ func (f *Fanout) runWorkers(ctx context.Context, req *request.Request) chan *res
 	responseCh := make(chan *response, f.serverCount)
 	go func() {
 		defer close(workerChannel)
-		for range f.serverCount {
+		for i := 0; i < f.serverCount; i++ {
 			select {
 			case <-ctx.Done():
 				return
@@ -137,7 +137,7 @@ func (f *Fanout) runWorkers(ctx context.Context, req *request.Request) chan *res
 		var wg sync.WaitGroup
 		wg.Add(f.workerCount)
 
-		for range f.workerCount {
+		for i := 0; i < f.workerCount; i++ {
 			go func() {
 				defer wg.Done()
 				for c := range workerChannel {

go.mod

@@ -1,6 +1,6 @@
 module github.com/networkservicemesh/fanout
 
-go 1.22
+go 1.21
 
 require (
 	github.com/coredns/caddy v1.1.1

internal/selector/rand.go

@@ -17,7 +17,10 @@
 // Package selector implements weighted random selection algorithm
 package selector
 
-import "math/rand/v2"
+import (
+	"math/rand"
+	"time"
+)
 
 // WeightedRand selector picks elements randomly based on their weights
 type WeightedRand[T any] struct {
@@ -34,7 +37,7 @@ func NewWeightedRandSelector[T any](values []T, weights []int) *WeightedRand[T]
 		weights:     make([]int, len(weights)),
 		totalWeight: 0,
 		//nolint:gosec // it's overhead to use crypto/rand here
-		r: rand.New(rand.NewPCG(rand.Uint64(), rand.Uint64())),
+		r: rand.New(rand.NewSource(time.Now().UnixNano())),
 	}
 	// copy the underlying array values as we're going to modify content of slices
 	copy(wrs.values, values)
@@ -54,10 +57,10 @@ func (wrs *WeightedRand[T]) Pick() T {
 		return defaultVal
 	}
 
-	rNum := wrs.r.IntN(wrs.totalWeight) + 1
+	rNum := wrs.r.Intn(wrs.totalWeight) + 1
 
 	sum := 0
-	for i := range len(wrs.values) {
+	for i := 0; i < len(wrs.values); i++ {
 		sum += wrs.weights[i]
 		if sum >= rNum {
 			wrs.totalWeight -= wrs.weights[i]

internal/selector/rand_test.go

@@ -1,7 +1,7 @@
 package selector
 
 import (
-	"math/rand/v2"
+	"math/rand"
 	"testing"
 
 	"github.com/stretchr/testify/assert"
@@ -20,42 +20,42 @@ func TestWeightedRand_Pick(t *testing.T) {
 			values:     []string{"a", "b", "c", "d", "e", "f", "g"},
 			weights:    []int{100, 100, 100, 100, 100, 100, 100},
 			picksCount: 7,
-			expected:   []string{"f", "d", "g", "e", "a", "c", "b"},
+			expected:   []string{"b", "a", "d", "f", "g", "c", "e"},
 		},
 		"pick_all_different_weight": {
 			values:     []string{"a", "b", "c", "d", "e", "f", "g"},
 			weights:    []int{100, 70, 10, 50, 100, 30, 50},
 			picksCount: 7,
-			expected:   []string{"e", "d", "f", "g", "a", "c", "b"},
+			expected:   []string{"d", "a", "e", "b", "g", "c", "f"},
 		},
 		"pick_some_same_weight": {
 			values:     []string{"a", "b", "c", "d", "e", "f", "g"},
 			weights:    []int{100, 100, 100, 100, 100, 100, 100},
 			picksCount: 3,
-			expected:   []string{"f", "d", "g"},
+			expected:   []string{"b", "a", "d"},
 		},
 		"pick_some_different_weight": {
 			values:     []string{"a", "b", "c", "d", "e", "f", "g"},
 			weights:    []int{100, 70, 10, 50, 100, 30, 50},
 			picksCount: 3,
-			expected:   []string{"e", "d", "f"},
+			expected:   []string{"d", "a", "e"},
 		},
 		"pick_more_than_available": {
 			values:     []string{"a", "b", "c"},
-			weights:    []int{100, 70, 10},
+			weights:    []int{70, 10, 100},
 			picksCount: 4,
-			expected:   []string{"b", "a", "c", ""},
+			expected:   []string{"a", "c", "b", ""},
 		},
 	}
 	for name, tc := range testCases {
 		t.Run(name, func(t *testing.T) {
 			wrs := NewWeightedRandSelector(tc.values, tc.weights)
 			// init rand with constant seed to get predefined result
 			//nolint:gosec
-			wrs.r = rand.New(rand.NewPCG(1, 2))
+			wrs.r = rand.New(rand.NewSource(1))
 
 			actual := make([]string, 0, tc.picksCount)
-			for range tc.picksCount {
+			for i := 0; i < tc.picksCount; i++ {
 				actual = append(actual, wrs.Pick())
 			}
 

internal/selector/simple_test.go

@@ -35,7 +35,7 @@ func TestSimple_Pick(t *testing.T) {
 			wrs := NewSimpleSelector(tc.values)
 
 			actual := make([]string, 0, tc.picksCount)
-			for range tc.picksCount {
+			for i := 0; i < tc.picksCount; i++ {
 				actual = append(actual, wrs.Pick())
 			}
 

setup.go

@@ -130,7 +130,7 @@ func parsefanoutStanza(c *caddyfile.Dispenser) (*Fanout, error) {
 		f.serverCount = len(toHosts)
 	}
 	if len(f.loadFactor) == 0 {
-		for range len(toHosts) {
+		for i := 0; i < len(toHosts); i++ {
 			f.loadFactor = append(f.loadFactor, maxLoadFactor)
 		}
 	}