initial import

core/discov/clients.go

@@ -0,0 +1,40 @@
+package discov
+
+import (
+	"fmt"
+	"strings"
+
+	"zero/core/discov/internal"
+)
+
+const (
+	indexOfKey = iota
+	indexOfId
+)
+
+const timeToLive int64 = 10
+
+var TimeToLive = timeToLive
+
+func extract(etcdKey string, index int) (string, bool) {
+	if index < 0 {
+		return "", false
+	}
+
+	fields := strings.FieldsFunc(etcdKey, func(ch rune) bool {
+		return ch == internal.Delimiter
+	})
+	if index >= len(fields) {
+		return "", false
+	}
+
+	return fields[index], true
+}
+
+func extractId(etcdKey string) (string, bool) {
+	return extract(etcdKey, indexOfId)
+}
+
+func makeEtcdKey(key string, id int64) string {
+	return fmt.Sprintf("%s%c%d", key, internal.Delimiter, id)
+}