pkg/discovery/kv/kv_test.go
Arnaud Porterie 35c086fa6b Add pkg/discovery for nodes discovery
Absorb Swarm's discovery package in order to provide a common node
discovery mechanism to be used by both Swarm and networking code.

Signed-off-by: Arnaud Porterie <arnaud.porterie@docker.com>
2015-09-25 13:33:23 -07:00

119 lines
3.5 KiB
Go

package kv
import (
"errors"
"path"
"testing"
"time"
"github.com/docker/docker/pkg/discovery"
"github.com/docker/libkv/store"
libkvmock "github.com/docker/libkv/store/mock"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/mock"
)
func TestInitialize(t *testing.T) {
storeMock, err := libkvmock.New([]string{"127.0.0.1"}, nil)
assert.NotNil(t, storeMock)
assert.NoError(t, err)
d := &Discovery{backend: store.CONSUL}
d.Initialize("127.0.0.1", 0, 0)
d.store = storeMock
s := d.store.(*libkvmock.Mock)
assert.Len(t, s.Endpoints, 1)
assert.Equal(t, s.Endpoints[0], "127.0.0.1")
assert.Equal(t, d.path, discoveryPath)
storeMock, err = libkvmock.New([]string{"127.0.0.1:1234"}, nil)
assert.NotNil(t, storeMock)
assert.NoError(t, err)
d = &Discovery{backend: store.CONSUL}
d.Initialize("127.0.0.1:1234/path", 0, 0)
d.store = storeMock
s = d.store.(*libkvmock.Mock)
assert.Len(t, s.Endpoints, 1)
assert.Equal(t, s.Endpoints[0], "127.0.0.1:1234")
assert.Equal(t, d.path, "path/"+discoveryPath)
storeMock, err = libkvmock.New([]string{"127.0.0.1:1234", "127.0.0.2:1234", "127.0.0.3:1234"}, nil)
assert.NotNil(t, storeMock)
assert.NoError(t, err)
d = &Discovery{backend: store.CONSUL}
d.Initialize("127.0.0.1:1234,127.0.0.2:1234,127.0.0.3:1234/path", 0, 0)
d.store = storeMock
s = d.store.(*libkvmock.Mock)
if assert.Len(t, s.Endpoints, 3) {
assert.Equal(t, s.Endpoints[0], "127.0.0.1:1234")
assert.Equal(t, s.Endpoints[1], "127.0.0.2:1234")
assert.Equal(t, s.Endpoints[2], "127.0.0.3:1234")
}
assert.Equal(t, d.path, "path/"+discoveryPath)
}
func TestWatch(t *testing.T) {
storeMock, err := libkvmock.New([]string{"127.0.0.1:1234"}, nil)
assert.NotNil(t, storeMock)
assert.NoError(t, err)
d := &Discovery{backend: store.CONSUL}
d.Initialize("127.0.0.1:1234/path", 0, 0)
d.store = storeMock
s := d.store.(*libkvmock.Mock)
mockCh := make(chan []*store.KVPair)
// The first watch will fail.
s.On("WatchTree", "path/"+discoveryPath, mock.Anything).Return(mockCh, errors.New("test error")).Once()
// The second one will succeed.
s.On("WatchTree", "path/"+discoveryPath, mock.Anything).Return(mockCh, nil).Once()
expected := discovery.Entries{
&discovery.Entry{Host: "1.1.1.1", Port: "1111"},
&discovery.Entry{Host: "2.2.2.2", Port: "2222"},
}
kvs := []*store.KVPair{
{Key: path.Join("path", discoveryPath, "1.1.1.1"), Value: []byte("1.1.1.1:1111")},
{Key: path.Join("path", discoveryPath, "2.2.2.2"), Value: []byte("2.2.2.2:2222")},
}
stopCh := make(chan struct{})
ch, errCh := d.Watch(stopCh)
// It should fire an error since the first WatchTree call failed.
assert.EqualError(t, <-errCh, "test error")
// We have to drain the error channel otherwise Watch will get stuck.
go func() {
for range errCh {
}
}()
// Push the entries into the store channel and make sure discovery emits.
mockCh <- kvs
assert.Equal(t, <-ch, expected)
// Add a new entry.
expected = append(expected, &discovery.Entry{Host: "3.3.3.3", Port: "3333"})
kvs = append(kvs, &store.KVPair{Key: path.Join("path", discoveryPath, "3.3.3.3"), Value: []byte("3.3.3.3:3333")})
mockCh <- kvs
assert.Equal(t, <-ch, expected)
// Make sure that if an error occurs it retries.
// This third call to WatchTree will be checked later by AssertExpectations.
s.On("WatchTree", "path/"+discoveryPath, mock.Anything).Return(mockCh, nil)
close(mockCh)
// Give it enough time to call WatchTree.
time.Sleep(3)
// Stop and make sure it closes all channels.
close(stopCh)
assert.Nil(t, <-ch)
assert.Nil(t, <-errCh)
s.AssertExpectations(t)
}