[golang] implement trading and contracting

golang/pkg/database/markets.go

@@ -0,0 +1,42 @@
+package database
+
+import (
+	"database/sql"
+	"encoding/json"
+	"fmt"
+	"time"
+
+	"git.adyxax.org/adyxax/spacetraders/golang/pkg/model"
+)
+
+func (db *DB) LoadMarket(symbol string) (*model.Market, error) {
+	var buf []byte
+	if err := db.QueryRow(`SELECT data FROM markets WHERE data->>'symbol' = ?;`, symbol).Scan(&buf); err != nil {
+		return nil, fmt.Errorf("failed to query row: %w", err)
+	}
+	var market model.Market
+	if err := json.Unmarshal(buf, &market); err != nil {
+		return nil, fmt.Errorf("failed to unmarshal market: %w", err)
+	}
+	return &market, nil
+}
+
+func (db *DB) SaveMarket(market *model.Market) error {
+	data, err := json.Marshal(market)
+	if err != nil {
+		return fmt.Errorf("failed to marshal market: %w", err)
+	}
+	_, err = db.Exec(
+		`INSERT INTO markets(data, updated)
+                VALUES (json(:data), :updated)
+         ON CONFLICT DO UPDATE SET data = :data, updated = :updated
+		                       WHERE data->>'symbol' = :symbol;`,
+		sql.Named("data", data),
+		sql.Named("symbol", market.Symbol),
+		sql.Named("updated", time.Now()),
+	)
+	if err != nil {
+		return fmt.Errorf("failed to exec: %w", err)
+	}
+	return nil
+}

golang/pkg/database/sql/001_trading.sql

@@ -4,11 +4,9 @@ CREATE TABLE agents (
 );
 CREATE TABLE markets (
   id INTEGER PRIMARY KEY,
-  systemSymbol TEXT NOT NULL,
   data JSON NOT NULL,
   updated DATE NOT NULL
 );
-CREATE INDEX markets_systemSymbol on markets (systemSymbol);
 CREATE UNIQUE INDEX markets_data_symbol on markets(json_extract(data, '$.symbol'));
 CREATE TABLE shipyards (
        id INTEGER PRIMARY KEY,