chore(all): return concrete types, accept interfaces

- Remove exported interfaces unused locally
- Define interfaces to accept arguments
- Return concrete types, not interfaces

internal/vpn/interfaces.go

@@ -0,0 +1,88 @@
+package vpn
+
+import (
+	"context"
+	"net"
+
+	"github.com/qdm12/gluetun/internal/configuration/settings"
+	"github.com/qdm12/gluetun/internal/models"
+	"github.com/qdm12/gluetun/internal/netlink"
+	"github.com/qdm12/gluetun/internal/portforward"
+	"github.com/qdm12/gluetun/internal/provider"
+	publicipmodels "github.com/qdm12/gluetun/internal/publicip/models"
+)
+
+type Firewall interface {
+	SetVPNConnection(ctx context.Context, connection models.Connection, interfaceName string) error
+	SetAllowedPort(ctx context.Context, port uint16, interfaceName string) error
+	RemoveAllowedPort(ctx context.Context, port uint16) error
+}
+
+type Routing interface {
+	VPNLocalGatewayIP(vpnInterface string) (gateway net.IP, err error)
+}
+
+type PortForward interface {
+	Start(ctx context.Context, data portforward.StartData) (outcome string, err error)
+	Stop(ctx context.Context) (outcome string, err error)
+}
+
+type OpenVPN interface {
+	WriteConfig(lines []string) error
+	WriteAuthFile(user, password string) error
+}
+
+type StateManager interface {
+	GetSettings() (vpn settings.VPN)
+	SetSettings(ctx context.Context, vpn settings.VPN) (outcome string)
+}
+
+type Providers interface {
+	Get(providerName string) provider.Provider
+}
+
+type Storage interface {
+	FilterServers(provider string, selection settings.ServerSelection) (servers []models.Server, err error)
+	GetServerByName(provider, name string) (server models.Server, ok bool)
+}
+
+type NetLinker interface {
+	AddrAdd(link netlink.Link, addr *netlink.Addr) error
+	IsWireguardSupported() (ok bool, err error)
+	RouteList(link netlink.Link, family int) (
+		routes []netlink.Route, err error)
+	RouteAdd(route *netlink.Route) error
+	RuleAdd(rule *netlink.Rule) error
+	RuleDel(rule *netlink.Rule) error
+	LinkList() (links []netlink.Link, err error)
+	LinkByName(name string) (link netlink.Link, err error)
+	LinkAdd(link netlink.Link) (err error)
+	LinkDel(link netlink.Link) (err error)
+	LinkSetUp(link netlink.Link) (err error)
+	LinkSetDown(link netlink.Link) (err error)
+}
+
+type DNSLoop interface {
+	ApplyStatus(ctx context.Context, status models.LoopStatus) (
+		outcome string, err error)
+	GetSettings() (settings settings.DNS)
+}
+
+type PublicIPLoop interface {
+	ApplyStatus(ctx context.Context, status models.LoopStatus) (
+		outcome string, err error)
+	SetData(data publicipmodels.IPInfoData)
+}
+
+type statusManager interface {
+	GetStatus() (status models.LoopStatus)
+	SetStatus(status models.LoopStatus)
+	ApplyStatus(ctx context.Context, status models.LoopStatus) (
+		outcome string, err error)
+	Lock()
+	Unlock()
+}
+
+type runner interface {
+	Run(ctx context.Context, waitError chan<- error, tunnelReady chan<- struct{})
+}