feat(vpn): rotate filtered servers on internal vpn restarts

- Fix #290

internal/provider/example/connection.go

@@ -13,5 +13,5 @@ func (p *Provider) GetConnection(selection settings.ServerSelection, ipv6Support
 	// combination. If one combination is not supported, set it to `0`.
 	defaults := utils.NewConnectionDefaults(443, 1194, 51820) //nolint:mnd
 	return utils.GetConnection(p.Name(),
-		p.storage, selection, defaults, ipv6Supported, p.randSource)
+		p.storage, selection, defaults, ipv6Supported, p.connPicker)
 }

internal/provider/example/provider.go

@@ -1,28 +1,27 @@
 package example
 
 import (
-	"math/rand"
 	"net/http"
 
 	"github.com/qdm12/gluetun/internal/constants/providers"
 	"github.com/qdm12/gluetun/internal/provider/common"
 	"github.com/qdm12/gluetun/internal/provider/example/updater"
+	"github.com/qdm12/gluetun/internal/provider/utils"
 )
 
 type Provider struct {
 	storage    common.Storage
-	randSource rand.Source
+	connPicker *utils.ConnectionPicker
 	common.Fetcher
 }
 
 // TODO: remove unneeded arguments once the updater is implemented.
-func New(storage common.Storage, randSource rand.Source,
-	updaterWarner common.Warner, client *http.Client,
+func New(storage common.Storage, updaterWarner common.Warner, client *http.Client,
 	unzipper common.Unzipper, parallelResolver common.ParallelResolver,
 ) *Provider {
 	return &Provider{
 		storage:    storage,
-		randSource: randSource,
+		connPicker: utils.NewConnectionPicker(),
 		Fetcher:    updater.New(updaterWarner, unzipper, client, parallelResolver),
 	}
 }