goipgrep: refactor into module; pure-Go ping/resolve; cache+CI; drop binary

projects/go-tools/go/goipgrep/internal/cache/cache_test.go

@@ -0,0 +1,54 @@
+package cache
+
+import (
+	"os"
+	"path/filepath"
+	"testing"
+	"time"
+
+	"git.ktf.ninja/tabledevil/gists/projects/go-tools/go/goipgrep/internal/ipinfo"
+)
+
+func TestCacheSaveLoad(t *testing.T) {
+	dir := t.TempDir()
+	path := filepath.Join(dir, "ipinfo.json")
+
+	s, err := Load(path, 0, 0)
+	if err != nil {
+		t.Fatalf("Load: %v", err)
+	}
+	s.Put("1.2.3.4", ipinfo.Info{IP: "1.2.3.4", Country: "US"})
+	if !s.Changed() {
+		t.Fatalf("expected changed")
+	}
+	if err := s.Save(); err != nil {
+		t.Fatalf("Save: %v", err)
+	}
+
+	s2, err := Load(path, 0, 0)
+	if err != nil {
+		t.Fatalf("Load2: %v", err)
+	}
+	info, ok := s2.Get("1.2.3.4")
+	if !ok || info.Country != "US" {
+		t.Fatalf("Get: ok=%v info=%#v", ok, info)
+	}
+}
+
+func TestCacheTTL(t *testing.T) {
+	dir := t.TempDir()
+	path := filepath.Join(dir, "ipinfo.json")
+
+	// Write a v1 cache with an old fetched_at.
+	b := []byte(`{"version":1,"entries":{"1.2.3.4":{"info":{"ip":"1.2.3.4","country":"US"},"fetched_at":"2000-01-01T00:00:00Z"}}}`)
+	if err := os.WriteFile(path, b, 0o644); err != nil {
+		t.Fatalf("WriteFile: %v", err)
+	}
+	s, err := Load(path, 24*time.Hour, 0)
+	if err != nil {
+		t.Fatalf("Load: %v", err)
+	}
+	if _, ok := s.Get("1.2.3.4"); ok {
+		t.Fatalf("expected TTL miss")
+	}
+}