move out tracers

Signed-off-by: Vasiliy Tolstov <v.tolstov@unistack.org>

tracer/options.go

@@ -0,0 +1,34 @@
+package tracer
+
+type Options struct {
+	// Size is the size of ring buffer
+	Size int
+}
+
+type Option func(o *Options)
+
+type ReadOptions struct {
+	// Trace id
+	Trace string
+}
+
+type ReadOption func(o *ReadOptions)
+
+// Read the given trace
+func ReadTrace(t string) ReadOption {
+	return func(o *ReadOptions) {
+		o.Trace = t
+	}
+}
+
+const (
+	// DefaultSize of the buffer
+	DefaultSize = 64
+)
+
+// DefaultOptions returns default options
+func DefaultOptions() Options {
+	return Options{
+		Size: DefaultSize,
+	}
+}