add: logparser v5 shared record

logparser/v5/pipe/recordshare.go

@@ -0,0 +1,58 @@
+// For more tutorials: https://blog.learngoprogramming.com
+//
+// Copyright © 2018 Inanc Gumus
+// Learn Go Programming Course
+// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
+//
+
+package pipe
+
+import (
+	"fmt"
+	"reflect"
+)
+
+// Record stores the log line fields.
+// The underlying fields are kept hidden.
+// The users of the package are decoupled from the underlying record fields.
+// When the fields change, the client won't feel the difference (at least in compile-time).
+type Record struct {
+	record
+}
+
+// String returns a string field. Panics when the field doesn't exist.
+func (r Record) String(field string) string {
+	return r.mustGet(field, reflect.String).String()
+}
+
+// Int returns an int field. Panics when the field doesn't exist.
+func (r Record) Int(field string) int {
+	return int(r.mustGet(field, reflect.Int).Int())
+}
+
+// Fields returns all the field names.
+// The names can be used to query the Record.
+func (r Record) Fields() (fields []string) {
+	t := reflect.TypeOf(record{})
+
+	for i := 0; i < t.NumField(); i++ {
+		f := t.Field(i)
+		s := fmt.Sprintf("(%s: %s)", f.Name, f.Type.Name())
+
+		fields = append(fields, s)
+	}
+
+	return
+}
+
+// mustGet the field with the same kind or panics.
+func (r Record) mustGet(field string, kind reflect.Kind) reflect.Value {
+	v := reflect.ValueOf(r.record).FieldByName(field)
+	if !v.IsValid() {
+		panic(fmt.Errorf("record.%s does not exist", field))
+	}
+	if v.Kind() != kind {
+		panic(fmt.Errorf("record.%s is not %q", field, kind))
+	}
+	return v
+}