241 lines
6.1 KiB
Go
241 lines
6.1 KiB
Go
package main
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import (
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"database/sql"
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"encoding/json"
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"fmt"
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"log"
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"net/http"
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"path/filepath"
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"strings"
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"time"
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"weatherstation/config"
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_ "github.com/lib/pq"
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)
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var db *sql.DB
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func initWebDB() error {
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cfg := config.GetConfig()
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connStr := fmt.Sprintf("host=%s port=%d user=%s password=%s dbname=%s sslmode=%s",
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cfg.Database.Host, cfg.Database.Port, cfg.Database.User,
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cfg.Database.Password, cfg.Database.DBName, cfg.Database.SSLMode)
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var err error
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db, err = sql.Open("postgres", connStr)
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if err != nil {
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return fmt.Errorf("无法连接到数据库: %v", err)
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}
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err = db.Ping()
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if err != nil {
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return fmt.Errorf("数据库连接测试失败: %v", err)
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}
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return nil
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}
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// 获取WH65LP站点列表
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func getWH65LPStations(w http.ResponseWriter, r *http.Request) {
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w.Header().Set("Content-Type", "application/json")
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w.Header().Set("Access-Control-Allow-Origin", "*")
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query := `
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SELECT DISTINCT s.station_id,
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COALESCE(s.password, '') as station_name,
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'WH65LP' as device_type,
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COALESCE(MAX(r.timestamp), '1970-01-01'::timestamp) as last_update
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FROM stations s
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LEFT JOIN rs485_weather_data r ON s.station_id = r.station_id
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WHERE s.station_id LIKE 'RS485-%'
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GROUP BY s.station_id, s.password
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ORDER BY s.station_id`
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rows, err := db.Query(query)
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if err != nil {
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http.Error(w, "查询站点失败", http.StatusInternalServerError)
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log.Printf("查询站点失败: %v", err)
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return
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}
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defer rows.Close()
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var stations []Station
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for rows.Next() {
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var station Station
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var lastUpdate time.Time
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err := rows.Scan(&station.StationID, &station.StationName, &station.DeviceType, &lastUpdate)
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if err != nil {
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log.Printf("扫描站点数据失败: %v", err)
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continue
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}
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station.LastUpdate = lastUpdate.Format("2006-01-02 15:04:05")
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stations = append(stations, station)
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}
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json.NewEncoder(w).Encode(stations)
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}
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// 获取站点历史数据
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func getStationData(w http.ResponseWriter, r *http.Request) {
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w.Header().Set("Content-Type", "application/json")
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w.Header().Set("Access-Control-Allow-Origin", "*")
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stationID := r.URL.Query().Get("station_id")
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startTime := r.URL.Query().Get("start_time")
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endTime := r.URL.Query().Get("end_time")
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interval := r.URL.Query().Get("interval")
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if stationID == "" || startTime == "" || endTime == "" {
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http.Error(w, "缺少必要参数", http.StatusBadRequest)
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return
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}
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// 默认间隔为1小时
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if interval == "" {
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interval = "1hour"
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}
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var query string
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var intervalSQL string
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switch interval {
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case "10min":
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intervalSQL = "10 minutes"
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case "30min":
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intervalSQL = "30 minutes"
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case "1hour":
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intervalSQL = "1 hour"
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default:
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intervalSQL = "1 hour"
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}
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// 构建查询SQL - 使用时间窗口聚合，显示上一个时间段的数据
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query = fmt.Sprintf(`
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WITH time_series AS (
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SELECT
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date_trunc('hour', timestamp) + INTERVAL '1 hour' +
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INTERVAL '%s' * FLOOR(EXTRACT(EPOCH FROM timestamp - date_trunc('hour', timestamp)) / EXTRACT(EPOCH FROM INTERVAL '%s')) as time_bucket,
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temperature,
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humidity,
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pressure,
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wind_speed,
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wind_direction,
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rainfall,
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light,
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uv
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FROM rs485_weather_data
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WHERE station_id = $1
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AND timestamp >= $2::timestamp
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AND timestamp <= $3::timestamp
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),
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aggregated_data AS (
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SELECT
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time_bucket,
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ROUND(AVG(temperature)::numeric, 2) as temperature,
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ROUND(AVG(humidity)::numeric, 2) as humidity,
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ROUND(AVG(pressure)::numeric, 2) as pressure,
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ROUND(AVG(wind_speed)::numeric, 2) as wind_speed,
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-- 风向使用矢量平均
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ROUND(DEGREES(ATAN2(
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AVG(SIN(RADIANS(wind_direction))),
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AVG(COS(RADIANS(wind_direction)))
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))::numeric + CASE
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WHEN DEGREES(ATAN2(
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AVG(SIN(RADIANS(wind_direction))),
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AVG(COS(RADIANS(wind_direction)))
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)) < 0 THEN 360
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ELSE 0
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END, 2) as wind_direction,
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-- 雨量使用差值计算
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ROUND((MAX(rainfall) - MIN(rainfall))::numeric, 3) as rainfall_diff,
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ROUND(AVG(light)::numeric, 2) as light,
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ROUND(AVG(uv)::numeric, 2) as uv
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FROM time_series
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GROUP BY time_bucket
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)
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SELECT
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time_bucket,
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COALESCE(temperature, 0) as temperature,
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COALESCE(humidity, 0) as humidity,
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COALESCE(pressure, 0) as pressure,
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COALESCE(wind_speed, 0) as wind_speed,
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COALESCE(wind_direction, 0) as wind_direction,
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COALESCE(rainfall_diff, 0) as rainfall,
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COALESCE(light, 0) as light,
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COALESCE(uv, 0) as uv
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FROM aggregated_data
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ORDER BY time_bucket`, intervalSQL, intervalSQL)
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rows, err := db.Query(query, stationID, startTime, endTime)
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if err != nil {
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http.Error(w, "查询数据失败", http.StatusInternalServerError)
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log.Printf("查询数据失败: %v", err)
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return
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}
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defer rows.Close()
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var data []WeatherPoint
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for rows.Next() {
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var point WeatherPoint
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var timestamp time.Time
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err := rows.Scan(×tamp, &point.Temperature, &point.Humidity,
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&point.Pressure, &point.WindSpeed, &point.WindDir,
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&point.Rainfall, &point.Light, &point.UV)
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if err != nil {
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log.Printf("扫描数据失败: %v", err)
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continue
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}
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point.DateTime = timestamp.Format("2006-01-02 15:04:05")
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data = append(data, point)
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}
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json.NewEncoder(w).Encode(data)
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}
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// 提供静态文件服务
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func serveStaticFiles() {
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// 获取当前工作目录
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workDir := "/home/yarnom/Archive/code/WeatherStation"
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webDir := filepath.Join(workDir, "web")
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// 创建文件服务器
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fs := http.FileServer(http.Dir(webDir))
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// 处理根路径请求
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http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
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if r.URL.Path == "/" {
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http.ServeFile(w, r, filepath.Join(webDir, "index.html"))
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return
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}
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// 检查文件是否存在
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if _, err := http.Dir(webDir).Open(strings.TrimPrefix(r.URL.Path, "/")); err != nil {
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http.NotFound(w, r)
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return
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}
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// 提供静态文件
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fs.ServeHTTP(w, r)
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})
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}
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func StartWebServer() {
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err := initWebDB()
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if err != nil {
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log.Fatalf("初始化Web数据库连接失败: %v", err)
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}
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// API路由
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http.HandleFunc("/api/stations", getWH65LPStations)
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http.HandleFunc("/api/data", getStationData)
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// 静态文件服务
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serveStaticFiles()
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log.Println("Web服务器启动，监听端口 10003...")
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log.Fatal(http.ListenAndServe(":10003", nil))
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}
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