/
writer.go
84 lines (71 loc) · 1.68 KB
/
writer.go
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package transmission
import (
"encoding/json"
"io"
"os"
"sync"
"time"
)
// WriterSender implements the Sender interface by marshalling events to JSON
// and writing to STDOUT, or to the writer W if one is specified.
type WriterSender struct {
W io.Writer
BlockOnResponses bool
ResponseQueueSize uint
responses chan Response
sync.Mutex
}
func (w *WriterSender) Start() error {
if w.ResponseQueueSize == 0 {
w.ResponseQueueSize = 100
}
w.responses = make(chan Response, w.ResponseQueueSize)
return nil
}
func (w *WriterSender) Stop() error { return nil }
func (w *WriterSender) Flush() error { return nil }
func (w *WriterSender) Add(ev *Event) {
var m []byte
tPointer := &(ev.Timestamp)
if ev.Timestamp.IsZero() {
tPointer = nil
}
// don't include sample rate if it's 1; this is the default
sampleRate := ev.SampleRate
if sampleRate == 1 {
sampleRate = 0
}
m, _ = json.Marshal(struct {
Data map[string]interface{} `json:"data"`
SampleRate uint `json:"samplerate,omitempty"`
Timestamp *time.Time `json:"time,omitempty"`
Dataset string `json:"dataset,omitempty"`
}{ev.Data, sampleRate, tPointer, ev.Dataset})
m = append(m, '\n')
w.Lock()
defer w.Unlock()
if w.W == nil {
w.W = os.Stdout
}
w.W.Write(m)
resp := Response{
// TODO what makes sense to set in the response here?
Metadata: ev.Metadata,
}
w.SendResponse(resp)
}
func (w *WriterSender) TxResponses() chan Response {
return w.responses
}
func (w *WriterSender) SendResponse(r Response) bool {
if w.BlockOnResponses {
w.responses <- r
} else {
select {
case w.responses <- r:
default:
return true
}
}
return false
}