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siterator.go
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siterator.go
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// Copyright 2018-2019 The logrange Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package pipe
import (
"context"
"github.com/logrange/logrange/pkg/model"
"github.com/logrange/logrange/pkg/model/field"
"github.com/logrange/logrange/pkg/model/tag"
"github.com/logrange/range/pkg/records"
"github.com/logrange/range/pkg/utils/bytes"
)
type (
// siterator struct provides model.Iterator functionality by adding extra fields extFlds to every record fields list
siterator struct {
// extFlds contains extra fields that will be added to every record's field list
extFlds field.Fields
it model.Iterator
w bytes.Writer
rfld field.Fields
ready bool
}
)
func (si *siterator) init(extFlds field.Fields, it model.Iterator) {
si.extFlds = extFlds
si.it = it
}
func (si *siterator) Next(ctx context.Context) {
si.it.Next(ctx)
si.ready = false
}
// Get returns current LogEvent, the TagsCond for the event or an error if any. It returns io.EOF when end of the collection is reached
func (si *siterator) Get(ctx context.Context) (model.LogEvent, tag.Line, error) {
le, ln, err := si.it.Get(ctx)
if err != nil {
return le, ln, err
}
if !si.ready {
si.w.Reset()
si.rfld = le.Fields.Concat(si.extFlds, &si.w)
si.ready = true
}
le.Fields = si.rfld
return le, ln, nil
}
func (si *siterator) Release() {
si.ready = false
}
func (si *siterator) SetBackward(bool) {
panic("not supported")
}
func (si *siterator) CurrentPos() records.IteratorPos {
return si.it.CurrentPos()
}