feat: implement iterative DNS resolver (closes #1) #9

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sneak merged 6 commits from feature/resolver into main 2026-02-20 19:37:59 +01:00
2 changed files with 153 additions and 638 deletions
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//go:build integration
package resolver_test
import (
"context"
"log/slog"
"os"
"strings"
"testing"
"time"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
"sneak.berlin/go/dnswatcher/internal/resolver"
)
// Integration tests hit real DNS servers. Run with:
// go test -tags integration -timeout 60s ./internal/resolver/
func newIntegrationResolver(t *testing.T) *resolver.Resolver {
t.Helper()
log := slog.New(slog.NewTextHandler(
os.Stderr,
&slog.HandlerOptions{Level: slog.LevelDebug},
))
return resolver.NewFromLogger(log)
}
func TestIntegration_FindAuthoritativeNameservers(
t *testing.T,
) {
t.Parallel()
r := newIntegrationResolver(t)
ctx, cancel := context.WithTimeout(
context.Background(), 30*time.Second,
)
defer cancel()
nameservers, err := r.FindAuthoritativeNameservers(
ctx, "example.com",
)
require.NoError(t, err)
require.NotEmpty(t, nameservers)
t.Logf("example.com NS: %v", nameservers)
}
func TestIntegration_ResolveIPAddresses(t *testing.T) {
t.Parallel()
r := newIntegrationResolver(t)
ctx, cancel := context.WithTimeout(
context.Background(), 30*time.Second,
)
defer cancel()
// sneak.cloud is on Cloudflare
nameservers, err := r.FindAuthoritativeNameservers(
ctx, "sneak.cloud",
)
require.NoError(t, err)
require.NotEmpty(t, nameservers)
hasCloudflare := false
for _, ns := range nameservers {
if strings.Contains(ns, "cloudflare") {
hasCloudflare = true
break
}
}
assert.True(t, hasCloudflare,
"sneak.cloud should be on Cloudflare, got: %v",
nameservers,
)
}

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