isle/go/daemon/network.go

package daemon

import (
	"context"
	"fmt"
	"isle/bootstrap"
	"isle/daemon/network"
)

func pickNetwork(
	ctx context.Context,
	networkLoader network.Loader,
	networks map[string]network.Network,
) (
	network.Network, error,
) {
	if len(networks) == 0 {
		return nil, ErrNoNetwork
	}

	creationParams, err := networkLoader.Loadable(ctx)
	if err != nil {
		return nil, fmt.Errorf("getting loadable networks: %w", err)
	}

	var (
		networkSearchStr   = getNetworkSearchStr(ctx)
		matchingNetworkIDs = make([]string, 0, len(networks))
	)

	for _, creationParam := range creationParams {
		if networkSearchStr == "" || creationParam.Matches(networkSearchStr) {
			matchingNetworkIDs = append(matchingNetworkIDs, creationParam.ID)
		}
	}

	if len(matchingNetworkIDs) == 0 {
		return nil, ErrNoMatchingNetworks
	} else if len(matchingNetworkIDs) > 1 {
		return nil, ErrMultipleMatchingNetworks
	}

	return networks[matchingNetworkIDs[0]], nil
}

func alreadyJoined(
	ctx context.Context,
	networks map[string]network.Network,
	creationParams bootstrap.CreationParams,
) (
	bool, error,
) {
	for networkID, network := range networks {
		existingCreationParams, err := network.GetNetworkCreationParams(ctx)
		if err != nil {
			return false, fmt.Errorf(
				"getting creation params of network %q: %w", networkID, err,
			)
		} else if existingCreationParams.Conflicts(creationParams) {
			return true, nil
		}
	}

	return false, nil
}