82 lines
1.7 KiB
Go
82 lines
1.7 KiB
Go
// Copyright 2017 Google Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//
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package pipoint
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import (
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"compress/gzip"
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"fmt"
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"log"
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"os"
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"time"
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)
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// EventLogger is a async event logger.
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type EventLogger struct {
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logger *log.Logger
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sink *os.File
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zip *gzip.Writer
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msgs chan []byte
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}
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// NewEventLogger creates a new event logger that writes to the given
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// base name.
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func NewEventLogger(name string) *EventLogger {
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now := time.Now().Format(time.RFC3339)
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fname := fmt.Sprintf("%s-%s.txt.gz", name, now)
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sink, err := os.OpenFile(fname, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0666)
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if err != nil {
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log.Panicln(err)
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}
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zip := gzip.NewWriter(sink)
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msgs := make(chan []byte, 10)
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el := &EventLogger{
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sink: sink,
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zip: zip,
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msgs: msgs,
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}
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el.logger = log.New(el, "", log.Ldate|log.Ltime|log.Lmicroseconds|log.Lshortfile)
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go el.run()
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return el
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}
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func (el *EventLogger) run() {
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tick := time.Tick(3 * time.Second)
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for {
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select {
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case p := <-el.msgs:
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el.zip.Write(p)
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case <-tick:
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el.zip.Flush()
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break
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}
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}
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}
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func (el *EventLogger) Write(p []byte) (n int, err error) {
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buf := make([]byte, len(p))
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copy(buf, p)
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el.msgs <- buf
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return len(p), nil
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}
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