[golang] implement systems and waypoints lookups

golang/pkg/database/systems.go

@@ -0,0 +1,57 @@
+package database
+
+import (
+	"encoding/json"
+	"fmt"
+	"time"
+
+	"git.adyxax.org/adyxax/spacetraders/golang/pkg/model"
+)
+
+// ----- System -----------------------------------------------------------------
+func (db *DB) LoadSystem(symbol string) (*model.System, error) {
+	var buf []byte
+	if err := db.QueryRow(`SELECT data FROM systems WHERE data->>'symbol' = ?;`, symbol).Scan(&buf); err != nil {
+		return nil, fmt.Errorf("failed to query system: %w", err)
+	}
+	var system model.System
+	if err := json.Unmarshal(buf, &system); err != nil {
+		return nil, fmt.Errorf("failed to unmarshal system: %w", err)
+	}
+	return &system, nil
+}
+
+func (db *DB) SaveSystem(system *model.System) error {
+	data, err := json.Marshal(system)
+	if err != nil {
+		return fmt.Errorf("failed to marshal system: %w", err)
+	}
+	if _, err := db.Exec(`INSERT INTO systems(data) VALUES (json(?));`, data); err != nil {
+		return fmt.Errorf("failed to append system: %w", err)
+	}
+	return nil
+}
+
+// ----- Waypoint ---------------------------------------------------------------
+func (db *DB) LoadWaypoint(symbol string) (*model.Waypoint, error) {
+	var buf []byte
+	if err := db.QueryRow(`SELECT data FROM waypoints WHERE data->>'symbol' = ?;`, symbol).Scan(&buf); err != nil {
+		return nil, fmt.Errorf("failed to query waypoint: %w", err)
+	}
+	var waypoint model.Waypoint
+	if err := json.Unmarshal(buf, &waypoint); err != nil {
+		return nil, fmt.Errorf("failed to unmarshal waypoint: %w", err)
+	}
+	return &waypoint, nil
+}
+
+func (db *DB) SaveWaypoint(waypoint *model.Waypoint) error {
+	data, err := json.Marshal(waypoint)
+	if err != nil {
+		return fmt.Errorf("failed to marshal waypoint: %w", err)
+	}
+	if _, err := db.Exec(`INSERT INTO waypoints(data, updated) VALUES (json(?), ?);`, data, time.Now()); err != nil {
+		return fmt.Errorf("failed to append waypoint: %w", err)
+	}
+	return nil
+}