family-lineage/server/plugin/rpc/rpc.go

package rpc

import (
	"context"
	"database/sql"
	"github.com/heroiclabs/nakama-common/runtime"
)

func getFirstWorld(ctx context.Context, logger runtime.Logger, nk runtime.NakamaModule) (string, error) {

	// List existing matches
	// that have been 1 & 32 players
	minSize := 1
	maxSize := 32

	// Lists server authorative servers
	if matches, err := nk.MatchList(ctx, 1, true, "", &minSize, &maxSize, ""); err != nil {
		logger.Printf("Failed to list matches when grabing first world! Error: %v\n", err)
		return "", err
	} else {
		// If no matches exist, create one
		if len(matches) <= 0 {

			// Create match
			matchID, createErr := nk.MatchCreate(ctx, "control", map[string]interface{}{})

			// Return if creation error
			if createErr != nil {
				logger.Printf("Failed to create match when grabing first world! Error: %v\n", createErr)
				return "", createErr
			}
			logger.Info("Successfully created new match!")

			// Return newly created match
			return matchID, nil

		} else {

			// Return first found match
			return matches[0].GetMatchId(), nil
		}
	}

}

func GetWorldId(ctx context.Context, logger runtime.Logger, db *sql.DB, nk runtime.NakamaModule, payload string) (string, error) {
	matchID, err := getFirstWorld(ctx, logger, nk)
	return matchID, err
}