124 lines
3.0 KiB
Go
124 lines
3.0 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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"html/template"
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"log"
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"net/http"
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"time"
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_ "github.com/mattn/go-sqlite3"
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)
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type LDRReading struct {
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Value int `json:"value"`
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Timestamp time.Time `json:"timestamp"`
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}
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var db *sql.DB
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func initDB() {
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var err error
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db, err = sql.Open("sqlite3", "./ldr_readings.db")
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if err != nil {
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log.Fatal(err)
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}
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createTable := `
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CREATE TABLE IF NOT EXISTS ldr_readings (
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id INTEGER PRIMARY KEY AUTOINCREMENT,
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value INTEGER NOT NULL,
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timestamp DATETIME DEFAULT CURRENT_TIMESTAMP
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);`
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_, err = db.Exec(createTable)
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if err != nil {
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log.Fatal(err)
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}
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}
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func handleLDRReading(w http.ResponseWriter, r *http.Request) {
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if r.Method != http.MethodPost {
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http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
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return
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}
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var reading LDRReading
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if err := json.NewDecoder(r.Body).Decode(&reading); err != nil {
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http.Error(w, err.Error(), http.StatusBadRequest)
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return
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}
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_, err := db.Exec("INSERT INTO ldr_readings (value, timestamp) VALUES (?, ?)",
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reading.Value, reading.Timestamp)
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if err != nil {
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http.Error(w, err.Error(), http.StatusInternalServerError)
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return
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}
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w.WriteHeader(http.StatusOK)
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}
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func handleGetReadings(w http.ResponseWriter, r *http.Request) {
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if r.Method != http.MethodGet {
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http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
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return
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}
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period := r.URL.Query().Get("period")
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var query string
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var args []interface{}
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switch period {
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case "day":
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query = "SELECT value, timestamp FROM ldr_readings WHERE timestamp >= datetime('now', '-1 day') ORDER BY timestamp"
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case "week":
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query = "SELECT value, timestamp FROM ldr_readings WHERE timestamp >= datetime('now', '-7 day') ORDER BY timestamp"
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case "month":
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query = "SELECT value, timestamp FROM ldr_readings WHERE timestamp >= datetime('now', '-30 day') ORDER BY timestamp"
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default:
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query = "SELECT value, timestamp FROM ldr_readings ORDER BY timestamp"
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}
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rows, err := db.Query(query, args...)
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if err != nil {
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http.Error(w, err.Error(), http.StatusInternalServerError)
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return
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}
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defer rows.Close()
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var readings []LDRReading
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for rows.Next() {
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var r LDRReading
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if err := rows.Scan(&r.Value, &r.Timestamp); err != nil {
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http.Error(w, err.Error(), http.StatusInternalServerError)
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return
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}
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readings = append(readings, r)
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}
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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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json.NewEncoder(w).Encode(readings)
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}
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func handleIndex(w http.ResponseWriter, r *http.Request) {
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tmpl := template.Must(template.ParseFiles("web/templates/index.html"))
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tmpl.Execute(w, nil)
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}
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func main() {
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initDB()
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defer db.Close()
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http.HandleFunc("/", handleIndex)
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http.HandleFunc("/api/ldr", handleLDRReading)
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http.HandleFunc("/api/readings", handleGetReadings)
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http.Handle("/static/", http.StripPrefix("/static/", http.FileServer(http.Dir("web/static"))))
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fmt.Println("Server starting on :8080...")
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log.Fatal(http.ListenAndServe(":8080", nil))
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}
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