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