cmd/stdiscorv: Fix database test (fixes #8828)

The problem was that a statistics/cleanup run is triggered when the
database started and runs concurrently with the test. That cleanup run
removes old entries without valid addresses, and one of the test objects
matched this. The test object would thus randomly be removed in the
middle of the test, causing a failure. This fixes it so the object looks
recent when the cleaner-upper looks, and also uses a RAM database
(faster).

cmd/stdiscosrv/database.go

@@ -16,6 +16,7 @@ import (
 	"time"
 
 	"github.com/syndtr/goleveldb/leveldb"
+	"github.com/syndtr/goleveldb/leveldb/storage"
 	"github.com/syndtr/goleveldb/leveldb/util"
 )
 
@@ -54,6 +55,18 @@ func newLevelDBStore(dir string) (*levelDBStore, error) {
 	}, nil
 }
 
+func newMemoryLevelDBStore() (*levelDBStore, error) {
+	db, err := leveldb.Open(storage.NewMemStorage(), nil)
+	if err != nil {
+		return nil, err
+	}
+	return &levelDBStore{
+		db:    db,
+		inbox: make(chan func(), 16),
+		clock: defaultClock{},
+	}, nil
+}
+
 func (s *levelDBStore) put(key string, rec DatabaseRecord) error {
 	t0 := time.Now()
 	defer func() {

cmd/stdiscosrv/database_test.go

@@ -9,15 +9,12 @@ package main
 import (
 	"context"
 	"fmt"
-	"os"
 	"testing"
 	"time"
 )
 
 func TestDatabaseGetSet(t *testing.T) {
-	os.RemoveAll("_database")
-	defer os.RemoveAll("_database")
-	db, err := newLevelDBStore("_database")
+	db, err := newMemoryLevelDBStore()
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -119,7 +116,7 @@ func TestDatabaseGetSet(t *testing.T) {
 
 	// Put a record with misses
 
-	rec = DatabaseRecord{Misses: 42}
+	rec = DatabaseRecord{Misses: 42, Missed: tc.Now().UnixNano()}
 	if err := db.put("efgh", rec); err != nil {
 		t.Fatal(err)
 	}
@@ -209,5 +206,6 @@ func (t *testClock) wind(d time.Duration) {
 }
 
 func (t *testClock) Now() time.Time {
+	t.now = t.now.Add(time.Nanosecond)
 	return t.now
 }