121 lines
2.9 KiB
Go
121 lines
2.9 KiB
Go
package pool
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import (
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"context"
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"math/rand"
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"testing"
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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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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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buffer = make([]float64, len(weights))
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)
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cache, err := newCache()
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require.NoError(t, err)
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client1 := newMockClient(names[0], *newPrivateKey(t))
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client1.errOnDial()
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client2 := newMockClient(names[1], *newPrivateKey(t))
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inner := &innerPool{
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sampler: newSampler(weights, rand.NewSource(0)),
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clients: []client{client1, client2},
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}
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p := &Pool{
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innerPools: []*innerPool{inner},
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cache: cache,
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key: newPrivateKey(t),
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rebalanceParams: rebalanceParameters{nodesParams: []*nodesParam{{weights: weights}}},
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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.(*mockClient)
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require.Equal(t, names[0], mock0.address())
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p.updateInnerNodesHealth(context.TODO(), 0, buffer)
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connection1, err := p.connection()
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require.NoError(t, err)
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mock1 := connection1.(*mockClient)
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require.Equal(t, names[1], mock1.address())
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// enabled first node again
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inner.lock.Lock()
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inner.clients[0] = newMockClient(names[0], *newPrivateKey(t))
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inner.lock.Unlock()
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p.updateInnerNodesHealth(context.TODO(), 0, buffer)
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inner.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.(*mockClient)
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require.Equal(t, names[0], mock0.address())
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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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buffer = make([]float64, len(weights))
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)
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sampl := newSampler(weights, rand.NewSource(0))
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inner := &innerPool{
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sampler: sampl,
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clients: []client{
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newMockClient(names[0], *newPrivateKey(t)),
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newMockClient(names[1], *newPrivateKey(t)),
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},
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}
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p := &Pool{
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innerPools: []*innerPool{inner},
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rebalanceParams: rebalanceParameters{nodesParams: []*nodesParam{{weights: weights}}},
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}
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p.updateInnerNodesHealth(context.TODO(), 0, buffer)
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inner.lock.RLock()
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defer inner.lock.RUnlock()
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require.Equal(t, inner.sampler, sampl)
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}
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