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os.go
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os.go
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// Copyright 2020 The vine 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 log
import (
"sync"
"github.com/google/uuid"
"github.com/lack-io/vine/util/ring"
)
// Should stream from OS
type osLog struct {
format FormatFunc
once sync.Once
sync.RWMutex
buffer *ring.Buffer
subs map[string]*osStream
}
type osStream struct {
stream chan Record
}
// Read reads log entries from the logger
func (o *osLog) Read(...ReadOption) ([]Record, error) {
var records []Record
// read the last 100 records
for _, v := range o.buffer.Get(100) {
records = append(records, v.Value.(Record))
}
return records, nil
}
// Write writes records to log
func (o *osLog) Write(r Record) error {
o.buffer.Put(r)
return nil
}
// Stream log records
func (o *osLog) Stream() (Stream, error) {
o.Lock()
defer o.Unlock()
// create stream
st := &osStream{
stream: make(chan Record, 128),
}
// save stream
o.subs[uuid.New().String()] = st
return st, nil
}
func (o *osStream) Chan() <-chan Record {
return o.stream
}
func (o *osStream) Stop() error {
return nil
}
func NewLog(opts ...Option) Log {
options := Options{
Format: DefaultFormat,
}
for _, o := range opts {
o(&options)
}
l := &osLog{
format: options.Format,
buffer: ring.New(1024),
subs: make(map[string]*osStream),
}
return l
}