288 lines
7.3 KiB
Go
288 lines
7.3 KiB
Go
package server
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import (
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"database/sql"
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"encoding/binary"
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"math"
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"net/http"
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"time"
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"weatherstation/internal/database"
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"github.com/gin-gonic/gin"
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)
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type radarTileRecord struct {
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DT time.Time
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Z int
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Y int
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X int
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Width int
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Height int
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West float64
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South float64
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East float64
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North float64
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ResDeg float64
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Data []byte
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}
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type radarTileResponse struct {
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DT string `json:"dt"`
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Z int `json:"z"`
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Y int `json:"y"`
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X int `json:"x"`
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Width int `json:"width"`
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Height int `json:"height"`
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West float64 `json:"west"`
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South float64 `json:"south"`
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East float64 `json:"east"`
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North float64 `json:"north"`
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ResDeg float64 `json:"res_deg"`
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Values [][]*float64 `json:"values"` // null 表示无效值
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}
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func getLatestRadarTile(db *sql.DB, z, y, x int) (*radarTileRecord, error) {
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const q = `
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SELECT dt, z, y, x, width, height, west, south, east, north, res_deg, data
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FROM radar_tiles
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WHERE z=$1 AND y=$2 AND x=$3
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ORDER BY dt DESC
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LIMIT 1`
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var r radarTileRecord
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err := db.QueryRow(q, z, y, x).Scan(
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&r.DT, &r.Z, &r.Y, &r.X, &r.Width, &r.Height,
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&r.West, &r.South, &r.East, &r.North, &r.ResDeg, &r.Data,
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)
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if err != nil {
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return nil, err
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}
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return &r, nil
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}
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// latestRadarTileHandler 返回指定 z/y/x 的最新瓦片，包含栅格 dBZ 值及元数据
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func latestRadarTileHandler(c *gin.Context) {
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// 固定默认 7/40/102，可通过查询参数覆盖
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z := parseIntDefault(c.Query("z"), 7)
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y := parseIntDefault(c.Query("y"), 40)
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x := parseIntDefault(c.Query("x"), 102)
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rec, err := getLatestRadarTile(database.GetDB(), z, y, x)
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if err != nil {
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c.JSON(http.StatusNotFound, gin.H{"error": "未找到雷达瓦片"})
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return
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}
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// 解码大端 int16 → dBZ (raw/10). >=32766 视为无效(null)
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w, h := rec.Width, rec.Height
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vals := make([][]*float64, h)
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// 每行 256 单元，每单元 2 字节
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if len(rec.Data) < w*h*2 {
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c.JSON(http.StatusInternalServerError, gin.H{"error": "数据长度异常"})
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return
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}
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off := 0
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for row := 0; row < h; row++ {
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rowVals := make([]*float64, w)
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for col := 0; col < w; col++ {
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v := int16(binary.BigEndian.Uint16(rec.Data[off : off+2]))
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off += 2
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if v >= 32766 {
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rowVals[col] = nil
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continue
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}
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dbz := float64(v) / 10.0
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// 限幅到 [0,75]（大部分 CREF 标准范围），便于颜色映射
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if dbz < 0 {
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dbz = 0
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} else if dbz > 75 {
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dbz = 75
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}
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vv := dbz
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rowVals[col] = &vv
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}
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vals[row] = rowVals
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}
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resp := radarTileResponse{
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DT: rec.DT.Format("2006-01-02 15:04:05"),
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Z: rec.Z,
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Y: rec.Y,
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X: rec.X,
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Width: rec.Width,
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Height: rec.Height,
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West: rec.West,
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South: rec.South,
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East: rec.East,
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North: rec.North,
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ResDeg: rec.ResDeg,
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Values: vals,
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}
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c.JSON(http.StatusOK, resp)
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}
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func parseIntDefault(s string, def int) int {
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if s == "" {
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return def
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}
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var n int
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_, err := fmtSscanf(s, &n)
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if err != nil || n == 0 || n == math.MinInt || n == math.MaxInt {
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return def
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}
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return n
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}
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// fmtSscanf is a tiny wrapper to avoid importing fmt only for Sscanf
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func fmtSscanf(s string, n *int) (int, error) {
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// naive fast parse
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sign := 1
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i := 0
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if len(s) > 0 && (s[0] == '-' || s[0] == '+') {
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if s[0] == '-' {
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sign = -1
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}
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i = 1
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}
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val := 0
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for ; i < len(s); i++ {
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ch := s[i]
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if ch < '0' || ch > '9' {
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return 0, fmtError("invalid")
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}
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val = val*10 + int(ch-'0')
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}
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*n = sign * val
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return 1, nil
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}
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type fmtError string
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func (e fmtError) Error() string { return string(e) }
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// ---------------- Radar station realtime API ----------------
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type radarWeatherRecord struct {
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Alias string
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Lat float64
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Lon float64
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DT time.Time
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Temperature float64
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Humidity float64
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Cloudrate float64
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Visibility float64
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Dswrf float64
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WindSpeed float64
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WindDirection float64
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Pressure float64
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}
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type radarWeatherResponse struct {
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Alias string `json:"alias"`
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Lat float64 `json:"lat"`
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Lon float64 `json:"lon"`
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DT string `json:"dt"`
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Temperature float64 `json:"temperature"`
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Humidity float64 `json:"humidity"`
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Cloudrate float64 `json:"cloudrate"`
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Visibility float64 `json:"visibility"`
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Dswrf float64 `json:"dswrf"`
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WindSpeed float64 `json:"wind_speed"`
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WindDirection float64 `json:"wind_direction"`
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Pressure float64 `json:"pressure"`
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}
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func latestRadarWeatherHandler(c *gin.Context) {
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alias := c.Query("alias")
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if alias == "" {
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alias = "南宁雷达站"
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}
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const q = `
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SELECT alias, lat, lon, dt,
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temperature, humidity, cloudrate, visibility, dswrf,
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wind_speed, wind_direction, pressure
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FROM radar_weather
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WHERE alias = $1
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ORDER BY dt DESC
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LIMIT 1`
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var r radarWeatherRecord
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err := database.GetDB().QueryRow(q, alias).Scan(
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&r.Alias, &r.Lat, &r.Lon, &r.DT,
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&r.Temperature, &r.Humidity, &r.Cloudrate, &r.Visibility, &r.Dswrf,
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&r.WindSpeed, &r.WindDirection, &r.Pressure,
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)
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if err != nil {
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c.JSON(http.StatusNotFound, gin.H{"error": "未找到实时气象数据"})
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return
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}
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resp := radarWeatherResponse{
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Alias: r.Alias,
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Lat: r.Lat,
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Lon: r.Lon,
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DT: r.DT.Format("2006-01-02 15:04:05"),
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Temperature: r.Temperature,
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Humidity: r.Humidity,
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Cloudrate: r.Cloudrate,
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Visibility: r.Visibility,
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Dswrf: r.Dswrf,
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WindSpeed: r.WindSpeed,
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WindDirection: r.WindDirection,
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Pressure: r.Pressure,
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}
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c.JSON(http.StatusOK, resp)
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}
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// radarWeatherAtHandler returns the radar weather record at the given dt (CST),
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// rounded/exact 10-minute bucket time string "YYYY-MM-DD HH:MM:SS".
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func radarWeatherAtHandler(c *gin.Context) {
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alias := c.Query("alias")
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if alias == "" {
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alias = "南宁雷达站"
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}
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dtStr := c.Query("dt")
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if dtStr == "" {
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c.JSON(http.StatusBadRequest, gin.H{"error": "缺少 dt 参数（YYYY-MM-DD HH:MM:SS）"})
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return
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}
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loc, _ := time.LoadLocation("Asia/Shanghai")
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if loc == nil {
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loc = time.FixedZone("CST", 8*3600)
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}
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dt, err := time.ParseInLocation("2006-01-02 15:04:05", dtStr, loc)
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if err != nil {
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c.JSON(http.StatusBadRequest, gin.H{"error": "无效的 dt 格式"})
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return
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}
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const q = `
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SELECT alias, lat, lon, dt,
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temperature, humidity, cloudrate, visibility, dswrf,
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wind_speed, wind_direction, pressure
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FROM radar_weather
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WHERE alias = $1 AND dt = $2
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LIMIT 1`
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var r radarWeatherRecord
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err = database.GetDB().QueryRow(q, alias, dt).Scan(
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&r.Alias, &r.Lat, &r.Lon, &r.DT,
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&r.Temperature, &r.Humidity, &r.Cloudrate, &r.Visibility, &r.Dswrf,
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&r.WindSpeed, &r.WindDirection, &r.Pressure,
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)
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if err != nil {
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c.JSON(http.StatusNotFound, gin.H{"error": "未找到指定时间的实时气象数据"})
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return
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}
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resp := radarWeatherResponse{
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Alias: r.Alias,
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Lat: r.Lat,
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Lon: r.Lon,
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DT: r.DT.Format("2006-01-02 15:04:05"),
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Temperature: r.Temperature,
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Humidity: r.Humidity,
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Cloudrate: r.Cloudrate,
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Visibility: r.Visibility,
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Dswrf: r.Dswrf,
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WindSpeed: r.WindSpeed,
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WindDirection: r.WindDirection,
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Pressure: r.Pressure,
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}
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c.JSON(http.StatusOK, resp)
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}
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