147 lines
2.6 KiB
Go
147 lines
2.6 KiB
Go
package tcp
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import (
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"net"
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"testing"
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"time"
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"github.com/stretchr/testify/assert"
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"github.com/stretchr/testify/require"
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)
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type fakeConn struct {
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writeCall map[string]int
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closeCall int
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}
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func (f *fakeConn) Read(b []byte) (n int, err error) {
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panic("implement me")
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}
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func (f *fakeConn) Write(b []byte) (n int, err error) {
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f.writeCall[string(b)]++
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return len(b), nil
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}
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func (f *fakeConn) Close() error {
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f.closeCall++
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return nil
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}
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func (f *fakeConn) LocalAddr() net.Addr {
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panic("implement me")
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}
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func (f *fakeConn) RemoteAddr() net.Addr {
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panic("implement me")
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}
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func (f *fakeConn) SetDeadline(t time.Time) error {
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panic("implement me")
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}
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func (f *fakeConn) SetReadDeadline(t time.Time) error {
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panic("implement me")
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}
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func (f *fakeConn) SetWriteDeadline(t time.Time) error {
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panic("implement me")
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}
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func (f *fakeConn) CloseWrite() error {
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panic("implement me")
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}
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func TestLoadBalancing(t *testing.T) {
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testCases := []struct {
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desc string
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serversWeight map[string]int
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totalCall int
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expectedWrite map[string]int
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expectedClose int
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}{
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{
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desc: "RoundRobin",
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serversWeight: map[string]int{
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"h1": 1,
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"h2": 1,
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},
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totalCall: 4,
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expectedWrite: map[string]int{
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"h1": 2,
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"h2": 2,
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},
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},
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{
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desc: "WeighedRoundRobin",
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serversWeight: map[string]int{
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"h1": 3,
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"h2": 1,
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},
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totalCall: 4,
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expectedWrite: map[string]int{
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"h1": 3,
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"h2": 1,
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},
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},
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{
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desc: "WeighedRoundRobin with more call",
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serversWeight: map[string]int{
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"h1": 3,
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"h2": 1,
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},
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totalCall: 16,
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expectedWrite: map[string]int{
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"h1": 12,
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"h2": 4,
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},
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},
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{
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desc: "WeighedRoundRobin with one 0 weight server",
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serversWeight: map[string]int{
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"h1": 3,
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"h2": 0,
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},
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totalCall: 16,
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expectedWrite: map[string]int{
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"h1": 16,
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},
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},
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{
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desc: "WeighedRoundRobin with all servers with 0 weight",
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serversWeight: map[string]int{
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"h1": 0,
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"h2": 0,
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"h3": 0,
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},
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totalCall: 10,
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expectedWrite: map[string]int{},
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expectedClose: 10,
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},
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}
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for _, test := range testCases {
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test := test
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t.Run(test.desc, func(t *testing.T) {
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t.Parallel()
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balancer := NewWRRLoadBalancer()
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for server, weight := range test.serversWeight {
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server := server
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balancer.AddWeightServer(HandlerFunc(func(conn WriteCloser) {
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_, err := conn.Write([]byte(server))
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require.NoError(t, err)
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}), &weight)
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}
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conn := &fakeConn{writeCall: make(map[string]int)}
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for range test.totalCall {
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balancer.ServeTCP(conn)
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}
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assert.Equal(t, test.expectedWrite, conn.writeCall)
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assert.Equal(t, test.expectedClose, conn.closeCall)
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})
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}
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}
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