feat(dev): Add provider example package

internal/provider/example/updater/resolve.go

@@ -0,0 +1,32 @@
+package updater
+
+import (
+	"time"
+
+	"github.com/qdm12/gluetun/internal/updater/resolver"
+)
+
+// TODO: remove this file if the parallel resolver is not used
+// by the updater.
+func parallelResolverSettings(hosts []string) (settings resolver.ParallelSettings) {
+	// TODO: adapt these constant values below to make the resolution
+	// as fast and as reliable as possible.
+	const (
+		maxFailRatio    = 0.1
+		maxDuration     = 20 * time.Second
+		betweenDuration = time.Second
+		maxNoNew        = 2
+		maxFails        = 2
+	)
+	return resolver.ParallelSettings{
+		Hosts:        hosts,
+		MaxFailRatio: maxFailRatio,
+		Repeat: resolver.RepeatSettings{
+			MaxDuration:     maxDuration,
+			BetweenDuration: betweenDuration,
+			MaxNoNew:        maxNoNew,
+			MaxFails:        maxFails,
+			SortIPs:         true,
+		},
+	}
+}