141 lines
3.8 KiB
Go
141 lines
3.8 KiB
Go
package trending
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import (
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"database/sql"
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"fmt"
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"time"
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)
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// Schema version to track database migrations
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const SchemaVersion = 1
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// CreateTablesIfNotExist ensures that all necessary database tables for the trending system exist
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func CreateTablesIfNotExist(db *sql.DB) error {
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// Create the trending_history table if it doesn't exist
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_, err := db.Exec(`
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CREATE TABLE IF NOT EXISTS trending_history (
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id SERIAL PRIMARY KEY,
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calculation_time TIMESTAMPTZ NOT NULL,
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kind INTEGER NOT NULL,
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trending_data JSONB NOT NULL
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)
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`)
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if err != nil {
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return fmt.Errorf("failed to create trending_history table: %w", err)
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}
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// Create an index on calculation_time and kind for faster queries
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_, err = db.Exec(`
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CREATE INDEX IF NOT EXISTS idx_trending_history_time_kind
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ON trending_history (calculation_time DESC, kind)
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`)
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if err != nil {
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return fmt.Errorf("failed to create index on trending_history: %w", err)
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}
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// Create schema version table if it doesn't exist
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_, err = db.Exec(`
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CREATE TABLE IF NOT EXISTS trending_schema_version (
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version INTEGER PRIMARY KEY,
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updated_at TIMESTAMPTZ NOT NULL
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)
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`)
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if err != nil {
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return fmt.Errorf("failed to create trending_schema_version table: %w", err)
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}
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// Check if we need to initialize the schema version
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var count int
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err = db.QueryRow(`SELECT COUNT(*) FROM trending_schema_version`).Scan(&count)
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if err != nil {
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return fmt.Errorf("failed to check trending_schema_version: %w", err)
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}
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if count == 0 {
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_, err = db.Exec(`
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INSERT INTO trending_schema_version (version, updated_at)
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VALUES ($1, $2)
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`, SchemaVersion, time.Now())
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if err != nil {
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return fmt.Errorf("failed to initialize trending_schema_version: %w", err)
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}
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}
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return nil
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}
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// GetLatestTrendingFromHistory retrieves the most recent trending data for the specified kind
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func GetLatestTrendingFromHistory(db *sql.DB, kind int) ([]Post, time.Time, error) {
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var (
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trendingData []byte
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calculationTime time.Time
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)
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err := db.QueryRow(`
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SELECT trending_data, calculation_time
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FROM trending_history
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WHERE kind = $1
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ORDER BY calculation_time DESC
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LIMIT 1
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`, kind).Scan(&trendingData, &calculationTime)
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if err != nil {
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if err == sql.ErrNoRows {
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return []Post{}, time.Time{}, nil
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}
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return nil, time.Time{}, fmt.Errorf("failed to get latest trending data: %w", err)
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}
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posts, err := UnmarshalPosts(trendingData)
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if err != nil {
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return nil, time.Time{}, fmt.Errorf("failed to unmarshal trending posts: %w", err)
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}
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return posts, calculationTime, nil
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}
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// GetTrendingHistoryForKind retrieves trending history for the specified kind
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// limit defines how many records to return, offset is for pagination
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func GetTrendingHistoryForKind(db *sql.DB, kind int, limit, offset int) ([]TrendingHistoryEntry, error) {
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rows, err := db.Query(`
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SELECT id, calculation_time, trending_data
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FROM trending_history
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WHERE kind = $1
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ORDER BY calculation_time DESC
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LIMIT $2 OFFSET $3
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`, kind, limit, offset)
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if err != nil {
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return nil, fmt.Errorf("failed to query trending history: %w", err)
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}
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defer rows.Close()
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var entries []TrendingHistoryEntry
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for rows.Next() {
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var (
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entry TrendingHistoryEntry
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trendingData []byte
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)
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err := rows.Scan(&entry.ID, &entry.CalculationTime, &trendingData)
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if err != nil {
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return nil, fmt.Errorf("failed to scan trending history entry: %w", err)
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}
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entry.Posts, err = UnmarshalPosts(trendingData)
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if err != nil {
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return nil, fmt.Errorf("failed to unmarshal trending posts: %w", err)
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}
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entries = append(entries, entry)
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}
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return entries, nil
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}
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// TrendingHistoryEntry represents a historical record of trending data
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type TrendingHistoryEntry struct {
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ID int `json:"id"`
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CalculationTime time.Time `json:"calculation_time"`
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Posts []Post `json:"posts"`
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}
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