traefik/pkg/tcp/wrr_load_balancer_test.go

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