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package dnsresolver
import (
"net"
"net/url"
"testing"
"github.com/miekg/dns"
"github.com/stretchr/testify/require"
"gitlab.com/gitlab-org/gitaly/v16/internal/testhelper"
"google.golang.org/grpc/resolver"
)
func TestBuildDNSBuilder_withBuiltInResolver(t *testing.T) {
t.Parallel()
for _, tc := range []struct {
desc string
target string
}{
{desc: "with triple slashes", target: "dns:///localhost:50051"},
{desc: "without triple slashes", target: "dns:localhost:50051"},
} {
tc := tc
t.Run(tc.desc, func(t *testing.T) {
t.Parallel()
// Actually resolve with built-in resolver. Localhost may return different results
// between machines.
expectedIPs, err := net.DefaultResolver.LookupHost(testhelper.Context(t), "localhost")
require.NoError(t, err)
builder := newTestDNSBuilder(t)
conn := newFakeClientConn(1, 0)
targetURL, err := url.Parse(tc.target)
require.NoError(t, err)
r, err := builder.Build(resolver.Target{URL: *targetURL}, conn, resolver.BuildOptions{})
require.NoError(t, err)
defer r.Close()
conn.Wait()
// Compare the recorded state with real DNS resolution
require.Equal(t, 1, len(conn.states))
state := conn.states[0]
var actualIPs []string
for _, addr := range state.Addresses {
host, port, err := net.SplitHostPort(addr.Addr)
require.NoError(t, err)
require.Equal(t, port, "50051")
actualIPs = append(actualIPs, host)
}
require.ElementsMatch(t, expectedIPs, actualIPs)
})
}
}
func TestBuildDNSBuilder_customAuthorityResolver(t *testing.T) {
t.Parallel()
fakeServer := testhelper.NewFakeDNSServer(t).WithHandler(dns.TypeA, func(host string) []string {
if host == "grpc.test." {
return []string{"1.2.3.4"}
}
return nil
}).Start()
builder := NewBuilder(&BuilderConfig{
RefreshRate: 0,
Logger: testhelper.NewDiscardingLogger(t),
Backoff: &fakeBackoff{},
})
conn := newFakeClientConn(1, 0)
r, err := builder.Build(buildResolverTarget(fakeServer, "grpc.test:50051"), conn, resolver.BuildOptions{})
require.NoError(t, err)
defer r.Close()
conn.Wait()
require.Equal(t, []resolver.State{{Addresses: []resolver.Address{{
Addr: "1.2.3.4:50051",
}}}}, conn.states)
}
func TestBuildDNSBuilder_staticIPAddress(t *testing.T) {
t.Parallel()
for _, tc := range []struct {
desc string
addr string
}{
{
desc: "IPv4",
addr: "4.3.2.1:50051",
},
{
desc: "Full IPv6",
addr: "[2001:0db8:85a3:0000:0000:8a2e:0370:7334]:50051",
},
{
desc: "Shortened IPv6",
addr: "[::3]:50051",
},
} {
tc := tc
t.Run(tc.desc, func(t *testing.T) {
t.Parallel()
fakeServer := testhelper.NewFakeDNSServer(t).WithHandler(dns.TypeA, func(_ string) []string {
require.FailNow(t, "resolving IP address should not result in a real DNS resolution")
return nil
}).Start()
builder := NewBuilder(&BuilderConfig{
RefreshRate: 0,
Logger: testhelper.NewDiscardingLogger(t),
Backoff: &fakeBackoff{},
})
conn := newFakeClientConn(1, 0)
r, err := builder.Build(buildResolverTarget(fakeServer, tc.addr), conn, resolver.BuildOptions{})
require.NoError(t, err)
defer r.Close()
conn.Wait()
require.Equal(t, []resolver.State{{Addresses: []resolver.Address{{
Addr: tc.addr,
}}}}, conn.states)
require.IsType(t, &noopResolver{}, r, "building a resolver for IP address should return a no-op resolver")
})
}
}
func TestSchemeDNSBuilder(t *testing.T) {
t.Parallel()
d := &Builder{}
require.Equal(t, d.Scheme(), "dns")
}
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