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source.go
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source.go
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// Copyright 2015 The LUCI 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 renderer
import (
"io"
"go.chromium.org/luci/logdog/api/logpb"
)
// Source returns successive LogEntry records for processing.
type Source interface {
// NextLogEntry returns the next successive LogEntry record to render, or an
// error if it could not be retrieved.
//
// If there are no more log entries in the stream, NextLogEntry should return
// io.EOF as an error.
//
// It is valid to return a LogEntry and an error (including io.EOF) at the
// same time. The LogEntry will be processed before the error.
NextLogEntry() (*logpb.LogEntry, error)
}
// StaticSource is a Source that returns successive log entries from a slice
// of log entries. The slice is mutated during processing.
type StaticSource []*logpb.LogEntry
var _ Source = (*StaticSource)(nil)
// NextLogEntry implements Source.
func (s *StaticSource) NextLogEntry() (le *logpb.LogEntry, err error) {
// Pop the next entry, mutating s.
if len(*s) > 0 {
le, *s = (*s)[0], (*s)[1:]
}
if len(*s) == 0 {
err = io.EOF
}
return
}