feat: port canonical runner

Signed-off-by: Artur Troian <[email protected]>

go/util/runner/runner.go

@@ -0,0 +1,40 @@
+package runner
+
+// Task is a function type which returns result instance
+type Task func() Result
+
+// Do executes task and send output to channel
+func Do(task Task) <-chan Result {
+	ch := make(chan Result, 1)
+	go func() {
+		ch <- task()
+	}()
+	return ch
+}
+
+// Result interface wraps Value and Error methods.
+type Result interface {
+	Value() interface{}
+	Error() error
+}
+
+// NewResult returns result instance with value as input
+func NewResult(value interface{}, err error) Result {
+	return result{
+		value: value,
+		err:   err,
+	}
+}
+
+type result struct {
+	value interface{}
+	err   error
+}
+
+func (r result) Value() interface{} {
+	return r.value
+}
+
+func (r result) Error() error {
+	return r.err
+}