98 lines
1.5 KiB
Go
98 lines
1.5 KiB
Go
package log
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import (
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"bufio"
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"encoding/json"
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"os"
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"time"
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)
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// Should stream from OS
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type osLog struct{}
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type osStream struct {
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stream chan Record
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scanner *bufio.Reader
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stop chan bool
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}
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// Read reads log entries from the logger
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func (o *osLog) Read(...ReadOption) ([]Record, error) {
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return []Record{}, nil
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}
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// Write writes records to log
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func (o *osLog) Write(r Record) error {
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b, _ := json.Marshal(r)
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_, err := os.Stderr.Write(b)
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return err
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}
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// Stream log records
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func (o *osLog) Stream() (Stream, error) {
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// read from standard error
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scanner := bufio.NewReader(os.Stderr)
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stream := make(chan Record, 128)
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stop := make(chan bool)
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go func() {
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for {
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select {
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case <-stop:
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return
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default:
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// read the line
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line, err := scanner.ReadString('\n')
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if err != nil {
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return
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}
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// check if the line exists
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if len(line) == 0 {
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continue
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}
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// parse the record
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var r Record
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if line[0] == '{' {
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json.Unmarshal([]byte(line), &r)
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} else {
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r = Record{
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Timestamp: time.Now(),
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Value: line,
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Metadata: make(map[string]string),
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}
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}
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// send to stream
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select {
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case <-stop:
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return
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case stream <- r:
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}
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}
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}
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}()
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return &osStream{
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stream: stream,
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scanner: scanner,
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stop: stop,
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}, nil
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}
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func (o *osStream) Chan() <-chan Record {
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return o.stream
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}
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func (o *osStream) Stop() error {
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select {
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case <-o.stop:
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return nil
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default:
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close(o.stop)
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}
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return nil
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}
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func NewLog(opts ...Option) Log {
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return &osLog{}
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}
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