Persist choices to database

.gitignore

@@ -0,0 +1,2 @@
+*.sqlite3
+.DS_Store

server/go.mod

@@ -0,0 +1,5 @@
+module wa5p.eu/datefinder
+
+go 1.22.0
+
+require github.com/mattn/go-sqlite3 v1.14.24

server/go.sum

@@ -0,0 +1,2 @@
+github.com/mattn/go-sqlite3 v1.14.24 h1:tpSp2G2KyMnnQu99ngJ47EIkWVmliIizyZBfPrBWDRM=
+github.com/mattn/go-sqlite3 v1.14.24/go.mod h1:Uh1q+B4BYcTPb+yiD3kU8Ct7aC0hY9fxUwlHK0RXw+Y=

server/server.go

@@ -1,16 +1,45 @@
 package main
 
 import (
+	"database/sql"
 	"encoding/json"
 	"fmt"
 	"log"
 	"net/http"
+
+	_ "github.com/mattn/go-sqlite3"
 )
 
 const (
 	PORT    = "8080"
+	DB_FILE = "./datefinder.sqlite3"
 )
 
+var (
+	db *sql.DB
+)
+
+func initDatabase() {
+	var err error
+	db, err = sql.Open("sqlite3", DB_FILE)
+	if err != nil {
+		log.Fatalf("[!] Could not open database file %s, error: %s\n", DB_FILE, err)
+	}
+
+	const query = `
+		CREATE TABLE IF NOT EXISTS choices (
+			id INTEGER PRIMARY KEY AUTOINCREMENT,
+			username TEXT NOT NULL,
+			choices TEXT NOT NULL
+		);
+	`
+
+	_, err = db.Exec(query)
+	if err != nil {
+		log.Fatalf("[!] Could not create database table, error: %s\n", err)
+	}
+}
+
 func handleGetPing(w http.ResponseWriter, r *http.Request) {
 	log.Printf("[*] Received request %v %v\n", r.Method, r.URL)
 	fmt.Fprintf(w, "PONG\n")
@@ -32,7 +61,22 @@ func handlePostSubmit(w http.ResponseWriter, r *http.Request) {
 		w.WriteHeader(http.StatusBadRequest)
 	}
 
-	log.Printf("TODO: Persist to database %v\n", choices)
+	choicesJson, err := json.Marshal(choices)
+	if err != nil {
+		log.Printf("[!] Could not marshal choices, error: %s\n", err)
+	}
+
+	const query = `
+		INSERT INTO choices (username, choices)
+		VALUES (?, ?);
+	`
+
+	_, err = db.Exec(query, "DUMMY USERNAME", string(choicesJson))
+	if err != nil {
+		log.Printf("[!] Could not insert choices into database, error: %s\n", err)
+	}
+
+	log.Printf("[*] Persisted choices for %s to database\n", "DUMMY USERNAME")
 
 	w.WriteHeader(http.StatusOK)
 }
@@ -45,6 +89,9 @@ func handleOptionsSubmit(w http.ResponseWriter, r *http.Request) {
 }
 
 func main() {
+	initDatabase()
+	defer db.Close()
+
 	http.HandleFunc(
 		"GET /api/ping",
 		handleGetPing,