312 lines
8.4 KiB
Go
312 lines
8.4 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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"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 rainTileRecord 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 rainTileResponse 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"` // 单位：mm，null 表示无效
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}
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func getLatestRainTile(db *sql.DB, z, y, x int) (*rainTileRecord, 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 rain_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 rainTileRecord
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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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func getRainTileAt(db *sql.DB, z, y, x int, dt time.Time) (*rainTileRecord, 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 rain_tiles
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WHERE z=$1 AND y=$2 AND x=$3 AND dt=$4
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LIMIT 1`
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var r rainTileRecord
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err := db.QueryRow(q, z, y, x, dt).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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// latestRainTileHandler 返回指定 z/y/x 的最新一小时降雨瓦片
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func latestRainTileHandler(c *gin.Context) {
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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 := getLatestRainTile(database.GetDB(), z, y, x)
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if err != nil {
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c.JSON(http.StatusNotFound, gin.H{"error": "未找到雨量瓦片"})
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return
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}
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w, h := rec.Width, rec.Height
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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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vals := decodeRain(rec.Data, w, h)
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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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resp := rainTileResponse{
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DT: rec.DT.In(loc).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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// rainTileAtHandler 返回指定 z/y/x 的指定时间（CST）瓦片
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func rainTileAtHandler(c *gin.Context) {
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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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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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rec, err := getRainTileAt(database.GetDB(), z, y, x, dt)
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if err != nil {
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c.JSON(http.StatusNotFound, gin.H{"error": "未找到指定时间瓦片"})
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return
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}
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w, h := rec.Width, rec.Height
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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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vals := decodeRain(rec.Data, w, h)
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// 始终以 CST(+8) 输出
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resp := rainTileResponse{
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DT: rec.DT.In(loc).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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// rainTileTimesHandler 返回指定 z/y/x 的可用时间列表（倒序）
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func rainTileTimesHandler(c *gin.Context) {
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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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fromStr := c.Query("from")
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toStr := c.Query("to")
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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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var rows *sql.Rows
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var err error
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if fromStr != "" && toStr != "" {
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from, err1 := time.ParseInLocation("2006-01-02 15:04:05", fromStr, loc)
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to, err2 := time.ParseInLocation("2006-01-02 15:04:05", toStr, loc)
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if err1 != nil || err2 != nil {
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c.JSON(http.StatusBadRequest, gin.H{"error": "无效的 from/to 时间格式"})
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return
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}
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const qRange = `
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SELECT dt FROM rain_tiles
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WHERE z=$1 AND y=$2 AND x=$3 AND dt BETWEEN $4 AND $5
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ORDER BY dt DESC`
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rows, err = database.GetDB().Query(qRange, z, y, x, from, to)
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} else {
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limit := parseIntDefault(c.Query("limit"), 48)
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const q = `
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SELECT dt FROM rain_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 $4`
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rows, err = database.GetDB().Query(q, z, y, x, limit)
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}
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if err != nil {
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c.JSON(http.StatusInternalServerError, gin.H{"error": "查询时间列表失败"})
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return
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}
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defer rows.Close()
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var times []string
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for rows.Next() {
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var dt time.Time
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if err := rows.Scan(&dt); err != nil {
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continue
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}
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times = append(times, dt.In(loc).Format("2006-01-02 15:04:05"))
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}
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c.JSON(http.StatusOK, gin.H{"times": times})
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}
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// nearestRainTileHandler 返回最接近给定时间的瓦片
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func nearestRainTileHandler(c *gin.Context) {
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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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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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tolMin := parseIntDefault(c.Query("tolerance_min"), 90)
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prefer := c.DefaultQuery("prefer", "lte") // lte|nearest
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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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target, 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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from := target.Add(-time.Duration(tolMin) * time.Minute)
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to := target.Add(time.Duration(tolMin) * time.Minute)
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db := database.GetDB()
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var row *sql.Row
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if prefer == "lte" {
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const q = `
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SELECT dt FROM rain_tiles
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WHERE z=$1 AND y=$2 AND x=$3 AND dt BETWEEN $4 AND $5 AND dt <= $6
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ORDER BY ($6 - dt) ASC
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LIMIT 1`
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row = db.QueryRow(q, z, y, x, from, to, target)
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} else {
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const q = `
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SELECT dt FROM rain_tiles
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WHERE z=$1 AND y=$2 AND x=$3 AND dt BETWEEN $4 AND $5
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ORDER BY ABS(EXTRACT(EPOCH FROM (dt - $6))) ASC
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LIMIT 1`
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row = db.QueryRow(q, z, y, x, from, to, target)
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}
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var picked time.Time
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if err := row.Scan(&picked); err != nil {
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c.JSON(http.StatusNotFound, gin.H{"error": "在容差范围内未找到匹配瓦片"})
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return
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}
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rec, err := getRainTileAt(db, z, y, x, picked)
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if err != nil {
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c.JSON(http.StatusNotFound, gin.H{"error": "未找到匹配瓦片数据"})
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return
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}
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w, h := rec.Width, rec.Height
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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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vals := decodeRain(rec.Data, w, h)
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// 以 CST(+8) 输出
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resp := rainTileResponse{
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DT: rec.DT.In(loc).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 decodeRain(buf []byte, w, h int) [][]*float64 {
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vals := make([][]*float64, h)
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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(buf[off : off+2]))
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off += 2
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if v >= 32766 { // 无效
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rowVals[col] = nil
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continue
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}
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mm := float64(v) / 10.0 // 0.1 mm 精度
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if mm < 0 {
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mm = 0
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}
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vv := mm
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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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return vals
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}
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