Refactor Batch Builder and prevent accidental and excessive refreshes from the web ui

internal/storage/batch.go

@@ -0,0 +1,91 @@
+// SPDX-FileCopyrightText: Copyright The Miniflux Authors. All rights reserved.
+// SPDX-License-Identifier: Apache-2.0
+
+package storage // import "miniflux.app/v2/internal/storage"
+
+import (
+	"database/sql"
+	"fmt"
+	"strings"
+
+	"miniflux.app/v2/internal/model"
+)
+
+type BatchBuilder struct {
+	db         *sql.DB
+	args       []any
+	conditions []string
+	limit      int
+}
+
+func (s *Storage) NewBatchBuilder() *BatchBuilder {
+	return &BatchBuilder{
+		db: s.db,
+	}
+}
+
+func (b *BatchBuilder) WithBatchSize(batchSize int) *BatchBuilder {
+	b.limit = batchSize
+	return b
+}
+
+func (b *BatchBuilder) WithUserID(userID int64) *BatchBuilder {
+	b.conditions = append(b.conditions, fmt.Sprintf("user_id = $%d", len(b.args)+1))
+	b.args = append(b.args, userID)
+	return b
+}
+
+func (b *BatchBuilder) WithCategoryID(categoryID int64) *BatchBuilder {
+	b.conditions = append(b.conditions, fmt.Sprintf("category_id = $%d", len(b.args)+1))
+	b.args = append(b.args, categoryID)
+	return b
+}
+
+func (b *BatchBuilder) WithErrorLimit(limit int) *BatchBuilder {
+	if limit > 0 {
+		b.conditions = append(b.conditions, fmt.Sprintf("parsing_error_count < $%d", len(b.args)+1))
+		b.args = append(b.args, limit)
+	}
+	return b
+}
+
+func (b *BatchBuilder) WithNextCheckExpired() *BatchBuilder {
+	b.conditions = append(b.conditions, "next_check_at < now()")
+	return b
+}
+
+func (b *BatchBuilder) WithoutDisabledFeeds() *BatchBuilder {
+	b.conditions = append(b.conditions, "disabled is false")
+	return b
+}
+
+func (b *BatchBuilder) FetchJobs() (jobs model.JobList, err error) {
+	var parts []string
+	parts = append(parts, `SELECT id, user_id FROM feeds`)
+
+	if len(b.conditions) > 0 {
+		parts = append(parts, fmt.Sprintf("WHERE %s", strings.Join(b.conditions, " AND ")))
+	}
+
+	if b.limit > 0 {
+		parts = append(parts, fmt.Sprintf("ORDER BY next_check_at ASC LIMIT %d", b.limit))
+	}
+
+	query := strings.Join(parts, " ")
+	rows, err := b.db.Query(query, b.args...)
+	if err != nil {
+		return nil, fmt.Errorf(`store: unable to fetch batch of jobs: %v`, err)
+	}
+	defer rows.Close()
+
+	for rows.Next() {
+		var job model.Job
+		if err := rows.Scan(&job.FeedID, &job.UserID); err != nil {
+			return nil, fmt.Errorf(`store: unable to fetch job: %v`, err)
+		}
+
+		jobs = append(jobs, job)
+	}
+
+	return jobs, nil
+}