frostfs-sdk-go/pkg/pool/sampler_test.go

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package pool
import (
"context"
"fmt"
"math/rand"
"testing"
"github.com/nspcc-dev/neofs-api-go/pkg/client"
"github.com/nspcc-dev/neofs-api-go/pkg/session"
"github.com/stretchr/testify/require"
)
func TestSamplerStability(t *testing.T) {
const COUNT = 100000
cases := []struct {
probabilities []float64
expected []int
}{
{
probabilities: []float64{1, 0},
expected: []int{COUNT, 0},
},
{
probabilities: []float64{0.1, 0.2, 0.7},
expected: []int{10138, 19813, 70049},
},
{
probabilities: []float64{0.2, 0.2, 0.4, 0.1, 0.1, 0},
expected: []int{19824, 20169, 39900, 10243, 9864, 0},
},
}
for _, tc := range cases {
sampler := NewSampler(tc.probabilities, rand.NewSource(0))
res := make([]int, len(tc.probabilities))
for i := 0; i < COUNT; i++ {
res[sampler.Next()]++
}
require.Equal(t, tc.expected, res, "probabilities: %v", tc.probabilities)
}
}
type clientMock struct {
client.Client
name string
err error
}
func newNetmapMock(name string, needErr bool) clientMock {
var err error
if needErr {
err = fmt.Errorf("not available")
}
return clientMock{name: name, err: err}
}
func (n clientMock) EndpointInfo(_ context.Context, _ ...client.CallOption) (*client.EndpointInfo, error) {
return nil, n.err
}
func (n clientMock) CreateSession(_ context.Context, _ uint64, _ ...client.CallOption) (*session.Token, error) {
return session.NewToken(), n.err
}
func TestHealthyReweight(t *testing.T) {
var (
weights = []float64{0.9, 0.1}
names = []string{"node0", "node1"}
options = &BuilderOptions{weights: weights}
buffer = make([]float64, len(weights))
)
p := &pool{
sampler: NewSampler(weights, rand.NewSource(0)),
clientPacks: []*clientPack{
{client: newNetmapMock(names[0], true), healthy: true},
{client: newNetmapMock(names[1], false), healthy: true}},
}
// check getting first node connection before rebalance happened
connection0, _, err := p.Connection()
require.NoError(t, err)
mock0 := connection0.(clientMock)
require.Equal(t, names[0], mock0.name)
updateNodesHealth(context.TODO(), p, options, buffer)
connection1, _, err := p.Connection()
require.NoError(t, err)
mock1 := connection1.(clientMock)
require.Equal(t, names[1], mock1.name)
// enabled first node again
p.lock.Lock()
p.clientPacks[0].client = newNetmapMock(names[0], false)
p.lock.Unlock()
updateNodesHealth(context.TODO(), p, options, buffer)
p.sampler = NewSampler(weights, rand.NewSource(0))
connection0, _, err = p.Connection()
require.NoError(t, err)
mock0 = connection0.(clientMock)
require.Equal(t, names[0], mock0.name)
require.NotNil(t, p.clientPacks[0].sessionToken)
}
func TestHealthyNoReweight(t *testing.T) {
var (
weights = []float64{0.9, 0.1}
names = []string{"node0", "node1"}
options = &BuilderOptions{weights: weights}
buffer = make([]float64, len(weights))
)
sampler := NewSampler(weights, rand.NewSource(0))
p := &pool{
sampler: sampler,
clientPacks: []*clientPack{
{client: newNetmapMock(names[0], false), healthy: true},
{client: newNetmapMock(names[1], false), healthy: true}},
}
updateNodesHealth(context.TODO(), p, options, buffer)
p.lock.RLock()
defer p.lock.RUnlock()
require.Truef(t, sampler == p.sampler, "Sampler must not be changed. Expected: %p, actual: %p", sampler, p.sampler)
}