422 lines
12 KiB
Go
422 lines
12 KiB
Go
package main
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import (
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"context"
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"database/sql"
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"flag"
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"fmt"
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"log"
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"math"
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"os"
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"sort"
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"strings"
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"time"
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"weatherstation/internal/config"
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"weatherstation/internal/database"
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)
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var (
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providerOrder = []string{"open-meteo", "caiyun", "imdroid"}
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defaultWeight = []float64{0.4, 0.3, 0.3}
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timeLayout = "2006-01-02 15:04:05"
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)
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func main() {
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var issuedInput string
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var issuedRange string
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var issuedStep int
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var stationFilter string
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var apply bool
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flag.StringVar(&issuedInput, "issued", "", "单个发布时间，例如 2025-10-05 20:00:00")
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flag.StringVar(&issuedRange, "issued_range", "", "发布时间范围，格式 \"开始,结束\"，例如 \"2025-10-05 20:00:00,2025-10-05 23:00:00\"")
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flag.IntVar(&issuedStep, "issued_step_hours", 1, "发布时间遍历步长（小时）")
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flag.StringVar(&stationFilter, "station", "", "可选，指定 station_id，仅处理该站点")
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flag.BoolVar(&apply, "apply", false, "直接写入 forecast_hourly（默认仅计算）")
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flag.Parse()
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if issuedInput == "" && issuedRange == "" {
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fmt.Fprintln(os.Stderr, "需要提供 --issued 或 --issued_range 参数")
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os.Exit(1)
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}
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if issuedInput != "" && issuedRange != "" {
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fmt.Fprintln(os.Stderr, "不能同时提供 --issued 与 --issued_range")
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os.Exit(1)
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}
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// 预先加载配置（也用于校验配置文件是否存在）
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_ = config.GetConfig()
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loc, err := time.LoadLocation("Asia/Shanghai")
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if err != nil {
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log.Printf("加载 Asia/Shanghai 时区失败，退回使用本地时区: %v", err)
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loc = time.Local
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}
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issuedTimes, err := buildIssuedTimes(loc, issuedInput, issuedRange, issuedStep)
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if err != nil {
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fmt.Fprintf(os.Stderr, "处理发布时间失败: %v\n", err)
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os.Exit(1)
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}
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if len(issuedTimes) == 0 {
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fmt.Fprintln(os.Stderr, "发布时间列表为空")
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return
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}
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ctx := context.Background()
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db := database.GetDB()
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defer database.Close()
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stations, err := loadStations(ctx, db, stationFilter)
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if err != nil {
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fmt.Fprintf(os.Stderr, "加载站点列表失败: %v\n", err)
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os.Exit(1)
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}
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if len(stations) == 0 {
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fmt.Println("没有找到匹配的站点或数据。")
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return
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}
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type summaryEntry struct {
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stationID string
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issuedAt time.Time
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targets [3]time.Time
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weighted [3]float64
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hasSource bool
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}
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var sqlBuilder strings.Builder
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var summaries []summaryEntry
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sort.Strings(stations)
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for _, issuedAt := range issuedTimes {
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targetTimes := []time.Time{
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issuedAt.Add(1 * time.Hour),
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issuedAt.Add(2 * time.Hour),
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issuedAt.Add(3 * time.Hour),
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}
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for _, stationID := range stations {
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matrix, hasSource, err := loadProviderMatrix(ctx, db, stationID, issuedAt, targetTimes)
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if err != nil {
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fmt.Fprintf(os.Stderr, "站点 %s 读取数据失败: %v\n", stationID, err)
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continue
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}
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weighted := applyWeights(matrix, defaultWeight)
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if hasSource && len(targetTimes) == 3 {
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sqlBuilder.WriteString(renderSQL(stationID, issuedAt, targetTimes, weighted))
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}
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if apply && hasSource {
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if err := writeForecast(ctx, db, stationID, issuedAt, targetTimes, weighted); err != nil {
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fmt.Fprintf(os.Stderr, "写入站点 %s 失败: %v\n", stationID, err)
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}
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}
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var targetsArr [3]time.Time
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if len(targetTimes) == 3 {
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targetsArr = [3]time.Time{targetTimes[0], targetTimes[1], targetTimes[2]}
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}
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summaries = append(summaries, summaryEntry{
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stationID: stationID,
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issuedAt: issuedAt,
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targets: targetsArr,
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weighted: weighted,
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hasSource: hasSource,
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})
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}
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}
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if sqlBuilder.Len() > 0 {
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label := buildIssuedLabel(issuedTimes)
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path, err := writeSQLFile(label, sqlBuilder.String())
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if err != nil {
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fmt.Fprintf(os.Stderr, "写入 SQL 文件失败: %v\n", err)
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} else {
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fmt.Printf("SQL 已保存至 %s\n", path)
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}
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}
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for _, item := range summaries {
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targetSlice := []time.Time{item.targets[0], item.targets[1], item.targets[2]}
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if err := printMixedSummaryFromDB(ctx, db, item.stationID, item.issuedAt, targetSlice, item.weighted, item.hasSource); err != nil {
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fmt.Fprintf(os.Stderr, "读取混合结果失败 station=%s issued=%s: %v\n", item.stationID, item.issuedAt.Format(timeLayout), err)
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}
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}
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}
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func buildIssuedTimes(loc *time.Location, single, rangeInput string, stepHours int) ([]time.Time, error) {
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if single == "" && rangeInput == "" {
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return nil, fmt.Errorf("未提供发布时间")
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}
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if single != "" {
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t, err := time.ParseInLocation(timeLayout, strings.TrimSpace(single), loc)
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if err != nil {
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return nil, fmt.Errorf("解析发布时间失败: %w", err)
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}
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return []time.Time{t}, nil
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}
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parts := strings.Split(rangeInput, ",")
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if len(parts) != 2 {
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return nil, fmt.Errorf("issued_range 格式应为 \"开始,结束\"")
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}
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start, err := time.ParseInLocation(timeLayout, strings.TrimSpace(parts[0]), loc)
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if err != nil {
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return nil, fmt.Errorf("解析开始时间失败: %w", err)
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}
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end, err := time.ParseInLocation(timeLayout, strings.TrimSpace(parts[1]), loc)
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if err != nil {
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return nil, fmt.Errorf("解析结束时间失败: %w", err)
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}
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if end.Before(start) {
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return nil, fmt.Errorf("结束时间早于开始时间")
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}
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if stepHours <= 0 {
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stepHours = 1
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}
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var list []time.Time
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for current := start; !current.After(end); current = current.Add(time.Duration(stepHours) * time.Hour) {
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list = append(list, current)
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}
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return list, nil
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}
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func buildIssuedLabel(times []time.Time) string {
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if len(times) == 0 {
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return "none"
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}
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if len(times) == 1 {
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return times[0].Format("20060102_150405")
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}
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first := times[0].Format("20060102_150405")
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last := times[len(times)-1].Format("20060102_150405")
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return fmt.Sprintf("%s-%s", first, last)
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}
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func loadStations(ctx context.Context, db *sql.DB, filter string) ([]string, error) {
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const baseQuery = `
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SELECT station_id
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FROM stations
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WHERE latitude IS NOT NULL
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AND longitude IS NOT NULL`
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if filter != "" {
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row := db.QueryRowContext(ctx, baseQuery+" AND station_id = $1", filter)
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if err := row.Scan(&filter); err != nil {
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if err == sql.ErrNoRows {
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return nil, nil
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}
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return nil, err
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}
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return []string{filter}, nil
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}
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rows, err := db.QueryContext(ctx, baseQuery)
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if err != nil {
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return nil, err
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}
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defer rows.Close()
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var stations []string
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for rows.Next() {
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var id string
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if err := rows.Scan(&id); err != nil {
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return nil, err
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}
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stations = append(stations, id)
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}
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return stations, rows.Err()
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}
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func loadProviderMatrix(ctx context.Context, db *sql.DB, stationID string, issuedAt time.Time, targets []time.Time) (map[string][3]float64, bool, error) {
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result := make(map[string][3]float64, len(providerOrder))
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for _, p := range providerOrder {
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result[p] = [3]float64{}
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}
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issuedUpper := issuedAt.Add(1 * time.Minute)
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query := `
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SELECT provider, forecast_time, COALESCE(rain_mm_x1000, 0)
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FROM forecast_hourly
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WHERE station_id = $1
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AND issued_at >= $2
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AND issued_at < $3
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AND provider IN ('open-meteo', 'caiyun', 'imdroid')
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AND forecast_time IN ($4, $5, $6)`
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rows, err := db.QueryContext(ctx, query, stationID, issuedAt, issuedUpper, targets[0], targets[1], targets[2])
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if err != nil {
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return nil, false, err
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}
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defer rows.Close()
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hasSource := false
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for rows.Next() {
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var provider string
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var ft time.Time
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var rain int64
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if err := rows.Scan(&provider, &ft, &rain); err != nil {
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return nil, false, err
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}
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offset := int(math.Round(ft.Sub(issuedAt).Hours()))
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if offset < 1 || offset > len(targets) {
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continue
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}
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hasSource = true
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data := result[provider]
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data[offset-1] = float64(rain) / 1000.0
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result[provider] = data
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}
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return result, hasSource, rows.Err()
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}
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func applyWeights(matrix map[string][3]float64, weight []float64) [3]float64 {
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var out [3]float64
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for hour := 0; hour < 3; hour++ {
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var sum float64
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for idx, provider := range providerOrder {
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sum += matrix[provider][hour] * weight[idx]
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}
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out[hour] = sum
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}
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return out
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}
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func renderSQL(stationID string, issuedAt time.Time, targets []time.Time, weighted [3]float64) string {
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const sqlTemplate = `
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INSERT INTO forecast_hourly (
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station_id, provider, issued_at, forecast_time,
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rain_mm_x1000, temp_c_x100, humidity_pct, wind_speed_ms_x1000,
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wind_gust_ms_x1000, wind_dir_deg, precip_prob_pct, pressure_hpa_x100
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) VALUES (
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'%s', 'imdroid_mix', '%s'::timestamptz, '%s'::timestamptz,
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%d, 0, 0, 0, 0, 0, 0, 0
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)
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ON CONFLICT (station_id, provider, issued_at, forecast_time)
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DO UPDATE SET
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rain_mm_x1000 = EXCLUDED.rain_mm_x1000,
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temp_c_x100 = EXCLUDED.temp_c_x100,
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humidity_pct = EXCLUDED.humidity_pct,
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wind_speed_ms_x1000 = EXCLUDED.wind_speed_ms_x1000,
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wind_gust_ms_x1000 = EXCLUDED.wind_gust_ms_x1000,
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wind_dir_deg = EXCLUDED.wind_dir_deg,
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precip_prob_pct = EXCLUDED.precip_prob_pct,
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pressure_hpa_x100 = EXCLUDED.pressure_hpa_x100;
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`
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var b strings.Builder
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fmt.Fprintf(&b, "-- SQL 输出 (默认未执行) station=%s\n", stationID)
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for idx, ft := range targets {
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rainInt := int64(math.Round(weighted[idx] * 1000))
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fmt.Fprintf(&b, sqlTemplate, stationID, issuedAt.Format(time.RFC3339), ft.Format(time.RFC3339), rainInt)
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}
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b.WriteByte('\n')
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return b.String()
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}
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func printMixedSummaryFromDB(ctx context.Context, db *sql.DB, stationID string, issuedAt time.Time, targets []time.Time, expected [3]float64, hasSource bool) error {
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query := `
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SELECT forecast_time, COALESCE(rain_mm_x1000, 0)
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FROM forecast_hourly
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WHERE station_id = $1
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AND provider = 'imdroid_mix'
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AND issued_at = $2
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AND forecast_time IN ($3, $4, $5)
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ORDER BY forecast_time`
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rows, err := db.QueryContext(ctx, query, stationID, issuedAt, targets[0], targets[1], targets[2])
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if err != nil {
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return err
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}
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defer rows.Close()
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type entry struct {
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ft time.Time
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rain float64
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}
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var list []entry
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for rows.Next() {
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var ft time.Time
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var rain int64
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if err := rows.Scan(&ft, &rain); err != nil {
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return err
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}
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list = append(list, entry{ft: ft, rain: float64(rain) / 1000.0})
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}
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if err := rows.Err(); err != nil {
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return err
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}
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if len(list) == 0 {
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fmt.Printf("imdroid_mix station=%s issued=%s => [", stationID, issuedAt.Format(timeLayout))
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for idx, ft := range targets {
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if idx > 0 {
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fmt.Print(", ")
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}
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fmt.Printf("{hour:%d, dt:\"%s\", rain_mm:%.3f}", idx+1, ft.Format(timeLayout), expected[idx])
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}
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label := "computed"
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if !hasSource {
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label += ", no_source"
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}
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fmt.Printf("] (%s)\n", label)
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return nil
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}
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fmt.Printf("imdroid_mix station=%s issued=%s => [", stationID, issuedAt.Format(timeLayout))
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for idx, item := range list {
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if idx > 0 {
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fmt.Print(", ")
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}
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fmt.Printf("{hour:%d, dt:\"%s\", rain_mm:%.3f}", idx+1, item.ft.Format(timeLayout), item.rain)
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}
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fmt.Println("] (db)")
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return nil
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}
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func writeSQLFile(label string, sqlContent string) (string, error) {
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if !strings.HasSuffix(sqlContent, "\n") {
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sqlContent += "\n"
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}
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runKey := time.Now().Format("20060102_150405")
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filename := fmt.Sprintf("imdroid_mix_%s_%s.sql", label, runKey)
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if err := os.WriteFile(filename, []byte(sqlContent), 0o644); err != nil {
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return "", err
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}
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return filename, nil
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}
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func writeForecast(ctx context.Context, db *sql.DB, stationID string, issuedAt time.Time, targets []time.Time, weighted [3]float64) error {
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for idx, ft := range targets {
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rain := int64(math.Round(weighted[idx] * 1000))
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_, err := db.ExecContext(ctx, `
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INSERT INTO forecast_hourly (
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station_id, provider, issued_at, forecast_time,
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rain_mm_x1000, temp_c_x100, humidity_pct, wind_speed_ms_x1000,
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wind_gust_ms_x1000, wind_dir_deg, precip_prob_pct, pressure_hpa_x100
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) VALUES ($1, 'imdroid_mix', $2, $3, $4, 0, 0, 0, 0, 0, 0, 0)
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ON CONFLICT (station_id, provider, issued_at, forecast_time)
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DO UPDATE SET
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rain_mm_x1000 = EXCLUDED.rain_mm_x1000,
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temp_c_x100 = EXCLUDED.temp_c_x100,
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humidity_pct = EXCLUDED.humidity_pct,
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wind_speed_ms_x1000 = EXCLUDED.wind_speed_ms_x1000,
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wind_gust_ms_x1000 = EXCLUDED.wind_gust_ms_x1000,
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wind_dir_deg = EXCLUDED.wind_dir_deg,
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precip_prob_pct = EXCLUDED.precip_prob_pct,
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pressure_hpa_x100 = EXCLUDED.pressure_hpa_x100
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`, stationID, issuedAt, ft, rain)
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if err != nil {
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return err
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}
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}
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return nil
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}
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