Fix slow-ass code

cmd/web/handlers.go

@@ -90,12 +90,12 @@ func (app *application) CreateElection(w http.ResponseWriter, r *http.Request) {
 		voterIdentities := make([]string, 0, request.MaxVoters) // TODO: this is way too slow
 		for i := 0; i < request.MaxVoters; i++ {
 			randomIdentity := randomVoterIdentity()
-			_, err := app.voters.Insert(randomIdentity, electionId)
-			if err != nil {
-				app.serverError(w, r, err)
-			}
 			voterIdentities = append(voterIdentities, randomIdentity)
 		}
+		_, err := app.voters.InsertMultiple(voterIdentities, electionId)
+		if err != nil {
+			app.serverError(w, r, err)
+		}
 
 		res, err = json.Marshal(api.CreateElectionResponse{VoterIdentities: &voterIdentities})
 		if err != nil {
@@ -248,7 +248,7 @@ func (app *application) createVotesHandleUnknownVotersElection(w http.ResponseWr
 		return "", fmt.Errorf(message)
 	}
 
-	_, err = app.voters.Insert(voterIdentity, election.ID)
+	_, err = app.voters.InsertMultiple([]string{voterIdentity}, election.ID)
 	if err != nil {
 		app.serverError(w, r, err)
 		return "", err

cmd/web/handlers_test.go

@@ -243,8 +243,8 @@ func TestCreateVotes_UnknownVotersElection(t *testing.T) {
 		On("Exists", mock.Anything, mock.Anything).
 		Return(false, nil)
 	mockVoters.
-		On("Insert", mock.Anything, mock.Anything).
-		Return(1, nil)
+		On("InsertMultiple", mock.Anything, mock.Anything).
+		Return([]int{1}, nil)
 	mockVoters.
 		On("CountByElection", mock.Anything).
 		Return(0, nil)
@@ -634,8 +634,8 @@ func TestCreateVotes_UnknownVotersElectionMaxVotersReached(t *testing.T) {
 		On("Exists", mock.Anything, mock.Anything).
 		Return(false, nil)
 	mockVoters.
-		On("Insert", mock.Anything, mock.Anything).
-		Return(1, nil)
+		On("InsertMultiple", mock.Anything, mock.Anything).
+		Return([]int{1}, nil)
 	mockVoters.
 		On("CountByElection", mock.Anything).
 		Return(10, nil)

cmd/web/main.go

@@ -48,7 +48,7 @@ func main() {
 		Addr:         addr,
 		Handler:      app.routes(),
 		ErrorLog:     slog.NewLogLogger(logger.Handler(), slog.LevelError),
-		IdleTimeout:  6 * time.Minute,
+		IdleTimeout:  time.Minute,
 		ReadTimeout:  5 * time.Second,
 		WriteTimeout: 10 * time.Second,
 	}

cmd/web/testutils_test.go

@@ -62,9 +62,9 @@ type mockVoterModel struct {
 	mock.Mock
 }
 
-func (v *mockVoterModel) Insert(identity string, electionID int) (int, error) {
-	args := v.Called(identity, electionID)
-	return args.Int(0), args.Error(1)
+func (v *mockVoterModel) InsertMultiple(identities []string, electionID int) ([]int, error) {
+	args := v.Called(identities, electionID)
+	return args.Get(0).([]int), args.Error(1)
 }
 
 func (v *mockVoterModel) CountByElection(electionID int) (int, error) {

internal/models/voters.go

@@ -6,7 +6,7 @@ import (
 )
 
 type VoterModelInterface interface {
-	Insert(identity string, electionID int) (int, error)
+	InsertMultiple(identities []string, electionID int) ([]int, error)
 	CountByElection(electionID int) (int, error)
 	Exists(voterIdentity string, electionID int) (bool, error)
 }
@@ -15,27 +15,45 @@ type VoterModel struct {
 	DB *sql.DB
 }
 
-func (v *VoterModel) Insert(identity string, electionID int) (int, error) {
+func (v *VoterModel) InsertMultiple(identities []string, electionID int) ([]int, error) {
 	tx, err := v.DB.Begin()
 	if err != nil {
-		return 0, err
+		return nil, err
 	}
 	defer tx.Rollback()
 
-	result, err := tx.Exec(`
+	// Prepare the statement once to reuse
+	stmt, err := tx.Prepare(`
         INSERT INTO voters (identity, election_id)
-        VALUES (?, ?)`,
-		identity, electionID)
+        VALUES (?, ?)`)
 	if err != nil {
-		return 0, err
+		return nil, err
+	}
+	defer stmt.Close()
+
+	// Store all voter IDs
+	voterIDs := make([]int, 0, len(identities))
+
+	// Execute statement for each identity
+	for _, identity := range identities {
+		result, err := stmt.Exec(identity, electionID)
+		if err != nil {
+			return nil, err
+		}
+
+		voterID, err := result.LastInsertId()
+		if err != nil {
+			return nil, err
+		}
+
+		voterIDs = append(voterIDs, int(voterID))
 	}
 
 	if err = tx.Commit(); err != nil {
-		return 0, err
+		return nil, err
 	}
 
-	voterId, err := result.LastInsertId()
-	return int(voterId), nil
+	return voterIDs, nil
 }
 
 func (v *VoterModel) CountByElection(electionID int) (int, error) {