frostfs-sdk-go/pool/sampler_test.go

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package pool
import (
"context"
"math/rand"
"testing"
"github.com/nspcc-dev/neofs-sdk-go/crypto/test"
"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)
}
}
func TestHealthyReweight(t *testing.T) {
var (
weights = []float64{0.9, 0.1}
names = []string{"node0", "node1"}
buffer = make([]float64, len(weights))
)
cache, err := newCache()
require.NoError(t, err)
client1 := newMockClient(names[0], test.RandomSigner(t))
client1.errOnDial()
client2 := newMockClient(names[1], test.RandomSigner(t))
inner := &innerPool{
sampler: newSampler(weights, rand.NewSource(0)),
clients: []client{client1, client2},
}
p := &Pool{
innerPools: []*innerPool{inner},
cache: cache,
signer: test.RandomSigner(t),
rebalanceParams: rebalanceParameters{nodesParams: []*nodesParam{{weights: weights}}},
}
// check getting first node connection before rebalance happened
connection0, err := p.connection()
require.NoError(t, err)
mock0 := connection0.(*mockClient)
require.Equal(t, names[0], mock0.address())
p.updateInnerNodesHealth(context.TODO(), 0, buffer)
connection1, err := p.connection()
require.NoError(t, err)
mock1 := connection1.(*mockClient)
require.Equal(t, names[1], mock1.address())
// enabled first node again
inner.lock.Lock()
inner.clients[0] = newMockClient(names[0], test.RandomSigner(t))
inner.lock.Unlock()
p.updateInnerNodesHealth(context.TODO(), 0, buffer)
inner.sampler = newSampler(weights, rand.NewSource(0))
connection0, err = p.connection()
require.NoError(t, err)
mock0 = connection0.(*mockClient)
require.Equal(t, names[0], mock0.address())
}
func TestHealthyNoReweight(t *testing.T) {
var (
weights = []float64{0.9, 0.1}
names = []string{"node0", "node1"}
buffer = make([]float64, len(weights))
)
sampl := newSampler(weights, rand.NewSource(0))
inner := &innerPool{
sampler: sampl,
clients: []client{
newMockClient(names[0], test.RandomSigner(t)),
newMockClient(names[1], test.RandomSigner(t)),
},
}
p := &Pool{
innerPools: []*innerPool{inner},
rebalanceParams: rebalanceParameters{nodesParams: []*nodesParam{{weights: weights}}},
}
p.updateInnerNodesHealth(context.TODO(), 0, buffer)
inner.lock.RLock()
defer inner.lock.RUnlock()
require.Equal(t, inner.sampler, sampl)
}