122 lines
3 KiB
Go
122 lines
3 KiB
Go
package db
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import (
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"context"
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"fmt"
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"log"
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"net/http"
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"github.com/jackc/pgx/v5/pgxpool"
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)
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// db connection info
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// !MIGHT CHANGE
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const (
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host = "localhost"
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port = 5432
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user = "asdfuser"
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password = "asdfpassword"
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dbname = "asdfdb"
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)
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var DbPool *pgxpool.Pool
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var allowedUsernames map[string]bool
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// initialize connection to db
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func ConnectToDb() (*pgxpool.Pool, error) {
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// this server is intended to be ran on the same system as the db
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dbUrl := fmt.Sprintf("postgresql://%s:%s@%s:%d/%s", user, password, host, port, dbname)
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config, err := pgxpool.ParseConfig((dbUrl))
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if err != nil {
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return nil, fmt.Errorf("unable to parse data URL: %w", err)
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}
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pool, err := pgxpool.NewWithConfig(context.Background(), config)
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if err != nil {
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return nil, fmt.Errorf("unable to create connection pool: %w", err)
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}
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log.Println("Connected to DB :)")
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return pool, nil
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}
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// setup demo db
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func SetupDemoDb(w http.ResponseWriter, r *http.Request) {
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// create table and insert demo data
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createTableSQL := `
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CREATE TABLE IF NOT EXISTS users (
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id SERIAL PRIMARY KEY,
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username VARCHAR(50) UNIQUE NOT NULL,
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email VARCHAR(100) NOT NULL
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);`
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// also avoid duplicate entries
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insertDataSQL := `
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INSERT INTO users (username, email) VALUES
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('alice', 'alice@example.com'),
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('bob', 'bob@example.com'),
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('charlie', 'charlie@example.com')
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ON CONFLICT (username) DO NOTHING;`
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// execute create table
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_, err := DbPool.Exec(context.Background(), createTableSQL)
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if err != nil {
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http.Error(w, "Failed to create table", http.StatusInternalServerError)
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log.Printf("Error creating table: %v", err)
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return
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}
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// execute insert demo data
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_, err = DbPool.Exec(context.Background(), insertDataSQL)
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if err != nil {
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http.Error(w, "Failed to insert demo data", http.StatusInternalServerError)
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log.Printf("Error inserting demo data: %v", err)
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return
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}
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// response back to client
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w.WriteHeader(http.StatusOK)
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w.Write([]byte("Database setup complete with demo data"))
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log.Println("Demo database setup completed successfully")
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}
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// nuke the db
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func NukeDb(w http.ResponseWriter, r *http.Request) {
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// drop user table
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dropTableSQL := `
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DROP TABLE IF EXISTS users CASCADE;
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`
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// execute the command
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_, err := DbPool.Exec(context.Background(), dropTableSQL)
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if err != nil {
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http.Error(w, "Failed to drop table", http.StatusInternalServerError)
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log.Printf("Error dropping table: %v", err)
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return
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}
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log.Println("Database nuked")
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}
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// fetch existing usernames from db
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func FetchUsernames() (map[string]bool, error) {
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usernames := make(map[string]bool)
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rows, err := DbPool.Query(context.Background(), "SELECT username FROM users")
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if err != nil {
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return nil, fmt.Errorf("error querying users: %w", err)
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}
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defer rows.Close()
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for rows.Next() {
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var username string
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if err := rows.Scan(&username); err != nil {
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return nil, fmt.Errorf("error scanning username: %w", err)
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}
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usernames[username] = true
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}
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log.Println("Fetched usernames:", usernames)
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return usernames, nil
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}
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