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handler_test.go
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package drovedns
import (
"context"
"encoding/json"
"net"
"testing"
"time"
"github.com/miekg/dns"
"github.com/stretchr/testify/assert"
)
type MockDroveClient struct{}
func (*MockDroveClient) FetchApps() (*DroveAppsResponse, error) {
apps := &DroveAppsResponse{}
json.Unmarshal([]byte(`{"status": "ok", "message": "ok", "data":[{"appId": "PS", "vhost": "example.com", "tags": {}, "hosts":[{"host": "host", "port": 1234, "portType": "http"}]}]}`), apps)
return apps, nil
}
func (*MockDroveClient) FetchRecentEvents(sync *CurrSyncPoint) (*DroveEventSummary, error) {
eventCount := make(map[string]interface{})
eventCount["APP_STATE_CHANGE"] = 1
return &DroveEventSummary{eventCount, 1}, nil
}
func (*MockDroveClient) PollEvents(callback func(event *DroveEventSummary)) {
}
func (*MockDroveClient) DefinedGateways() []net.IP {
return []net.IP{net.ParseIP("127.0.0.1")}
}
type MockResponseWriter struct {
dns.ResponseWriter
validator func(ms *dns.Msg)
callCounter int
}
func (w *MockResponseWriter) WriteMsg(res *dns.Msg) error {
w.callCounter += 1
w.validator(res)
return nil
}
func TestServeDNSNotReady(t *testing.T) {
handler := DroveHandler{DroveEndpoints: newDroveEndpoints(&MockDroveClient{})}
writer := &MockResponseWriter{
validator: func(res *dns.Msg) {
assert.Equal(t, 1, len(res.Answer), "One Answer should be returned")
assert.Equal(t, 0, len(res.Extra), "Additional should be empty")
assert.Equal(t, "host.", res.Answer[0].(*dns.SRV).Target, "'host' should be the target")
assert.Equal(t, uint16(1234), res.Answer[0].(*dns.SRV).Port, "1234 should be the port")
}}
code, err := handler.ServeDNS(context.Background(), writer, &dns.Msg{Question: []dns.Question{dns.Question{Name: "example.com.", Qtype: dns.TypeSRV, Qclass: dns.ClassINET}}})
assert.NotNil(t, err, "Error should be returned")
assert.Equal(t, dns.RcodeServerFailure, code, "Failure error code should be returned")
assert.Equal(t, 0, writer.callCounter, "Message would not be written")
}
func TestServeDNSAnswer(t *testing.T) {
handler := NewDroveHandler(&MockDroveClient{})
for !handler.Ready() {
time.Sleep(1)
}
writer := &MockResponseWriter{
validator: func(res *dns.Msg) {
assert.Equal(t, 1, len(res.Answer), "One Answer should be returned")
assert.Equal(t, 0, len(res.Extra), "Additional should be empty")
assert.Equal(t, "host.", res.Answer[0].(*dns.SRV).Target, "'host' should be the target")
assert.Equal(t, uint16(1234), res.Answer[0].(*dns.SRV).Port, "1234 should be the port")
}}
code, err := handler.ServeDNS(context.Background(), writer, &dns.Msg{Question: []dns.Question{dns.Question{Name: "example.com.", Qtype: dns.TypeSRV, Qclass: dns.ClassINET}}})
assert.Nil(t, err, "Error should be nil")
assert.Equal(t, dns.RcodeSuccess, code, "SuccessCode should be returned")
assert.Less(t, 0, writer.callCounter, "Message should be written")
}
func TestServeDNSARecordAnswer(t *testing.T) {
handler := NewDroveHandler(&MockDroveClient{})
for !handler.Ready() {
time.Sleep(1)
}
writer := &MockResponseWriter{
validator: func(res *dns.Msg) {
assert.Equal(t, 1, len(res.Answer), "One Answer should be returned")
assert.Equal(t, 0, len(res.Extra), "Additional should be empty")
assert.Equal(t, net.ParseIP("127.0.0.1"), res.Answer[0].(*dns.A).A, "output of DefinedGateWays should be the target")
}}
code, err := handler.ServeDNS(context.Background(), writer, &dns.Msg{Question: []dns.Question{dns.Question{Name: "example.com.", Qtype: dns.TypeA, Qclass: dns.ClassINET}}})
assert.Nil(t, err, "Error should be nil")
assert.Equal(t, dns.RcodeSuccess, code, "SuccessCode should be returned")
assert.Less(t, 0, writer.callCounter, "Message should be written")
}
func TestServeDNSAdditional(t *testing.T) {
handler := NewDroveHandler(&MockDroveClient{})
for !handler.Ready() {
time.Sleep(1)
}
writer := &MockResponseWriter{
validator: func(res *dns.Msg) {
assert.Equal(t, 0, len(res.Answer))
assert.Equal(t, 1, len(res.Extra))
assert.Equal(t, "host.", res.Extra[0].(*dns.SRV).Target)
assert.Equal(t, uint16(1234), res.Extra[0].(*dns.SRV).Port)
}}
code, err := handler.ServeDNS(context.Background(), writer, &dns.Msg{Question: []dns.Question{dns.Question{Name: "example.com.", Qtype: dns.TypeAAAA, Qclass: dns.ClassINET}}})
assert.Nil(t, err, "Error should be nil")
assert.Equal(t, dns.RcodeSuccess, code, "SuccessCode should be returned")
assert.Less(t, 0, writer.callCounter, "Message should be written")
}
func TestServeDNSNoMatchingApp(t *testing.T) {
handler := NewDroveHandler(&MockDroveClient{})
for !handler.Ready() {
time.Sleep(1)
}
writer := &MockResponseWriter{
validator: func(res *dns.Msg) {
assert.Equal(t, 0, len(res.Answer))
assert.Equal(t, 1, len(res.Extra))
assert.Equal(t, "host.", res.Extra[0].(*dns.SRV).Target)
assert.Equal(t, uint16(1234), res.Extra[0].(*dns.SRV).Port)
}}
code, err := handler.ServeDNS(context.Background(), writer, &dns.Msg{Question: []dns.Question{dns.Question{Name: "example2.com.", Qtype: dns.TypeA, Qclass: dns.ClassINET}}})
assert.NotNil(t, err, "Error should be returned")
assert.Equal(t, dns.RcodeServerFailure, code, "Failure error code should be returned")
assert.Equal(t, 0, writer.callCounter, "Message should not be Written")
}
func TestServeDNSNoMatchingAppALookup(t *testing.T) {
handler := NewDroveHandler(&MockDroveClient{})
for !handler.Ready() {
time.Sleep(1)
}
writer := &MockResponseWriter{
validator: func(res *dns.Msg) {
assert.Equal(t, 0, len(res.Answer))
assert.Equal(t, 0, len(res.Extra))
assert.Equal(t, "host.", res.Extra[0].(*dns.SRV).Target)
assert.Equal(t, uint16(1234), res.Extra[0].(*dns.SRV).Port)
}}
code, err := handler.ServeDNS(context.Background(), writer, &dns.Msg{Question: []dns.Question{dns.Question{Name: "example2.com.", Qtype: dns.TypeA, Qclass: dns.ClassINET}}})
assert.NotNil(t, err, "Error should be returned")
assert.Equal(t, dns.RcodeServerFailure, code, "Failure error code should be returned")
assert.Equal(t, 0, writer.callCounter, "Message should not be Written")
}
type MockHandler struct {
callCounter int
}
func (h *MockHandler) ServeDNS(c context.Context, rw dns.ResponseWriter, r *dns.Msg) (int, error) {
h.callCounter += 1
r.Answer = append(r.Answer, &dns.A{
A: net.IPv4(1, 1, 1, 1),
})
return 0, nil
}
func (h *MockHandler) Name() string {
return "MOCK"
}
func TestServeDNSForwarding(t *testing.T) {
handler := NewDroveHandler(&MockDroveClient{})
mockNextHandler := MockHandler{}
handler.Next = &mockNextHandler
for !handler.Ready() {
time.Sleep(1)
}
writer := &MockResponseWriter{
validator: func(res *dns.Msg) {
assert.Equal(t, 0, len(res.Answer))
assert.Equal(t, 1, len(res.Extra))
assert.Equal(t, "host.", res.Extra[0].(*dns.SRV).Target)
assert.Equal(t, uint16(1234), res.Extra[0].(*dns.SRV).Port)
}}
handler.ServeDNS(context.Background(), writer, &dns.Msg{Question: []dns.Question{dns.Question{Name: "example.com.", Qtype: dns.TypeA, Qclass: dns.ClassINET}}})
assert.Equal(t, 1, mockNextHandler.callCounter, "Next handler should be called")
}