mirror of https://github.com/docker/docs.git
55 lines
1.4 KiB
Go
55 lines
1.4 KiB
Go
package leadership
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import (
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"testing"
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"github.com/docker/libkv/store"
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libkvmock "github.com/docker/libkv/store/mock"
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"github.com/stretchr/testify/assert"
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"github.com/stretchr/testify/mock"
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)
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func TestFollower(t *testing.T) {
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kv, err := libkvmock.New([]string{}, nil)
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assert.NoError(t, err)
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assert.NotNil(t, kv)
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mockStore := kv.(*libkvmock.Mock)
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kvCh := make(chan *store.KVPair)
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var mockKVCh <-chan *store.KVPair = kvCh
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mockStore.On("Watch", "test_key", mock.Anything).Return(mockKVCh, nil)
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follower := NewFollower(kv, "test_key")
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leaderCh, errCh := follower.FollowElection()
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// Simulate leader updates
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go func() {
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kvCh <- &store.KVPair{Key: "test_key", Value: []byte("leader1")}
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kvCh <- &store.KVPair{Key: "test_key", Value: []byte("leader1")}
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kvCh <- &store.KVPair{Key: "test_key", Value: []byte("leader2")}
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kvCh <- &store.KVPair{Key: "test_key", Value: []byte("leader1")}
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}()
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// We shouldn't see duplicate events.
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assert.Equal(t, <-leaderCh, "leader1")
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assert.Equal(t, <-leaderCh, "leader2")
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assert.Equal(t, <-leaderCh, "leader1")
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assert.Equal(t, follower.Leader(), "leader1")
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// Once stopped, iteration over the leader channel should stop.
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follower.Stop()
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close(kvCh)
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// Assert that we receive an error from the error chan to deal with the failover
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err, open := <-errCh
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assert.True(t, open)
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assert.NotNil(t, err)
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// Ensure that the chan is closed
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_, open = <-leaderCh
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assert.False(t, open)
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mockStore.AssertExpectations(t)
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}
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