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analytics.go
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analytics.go
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package analytics
import (
"context"
"sync"
"time"
"github.com/google/uuid"
"github.com/hashicorp/go-hclog"
"github.com/mitchellh/mapstructure"
"github.com/vercel/turbo/cli/internal/util"
)
type Events = []map[string]interface{}
type EventPayload = interface{}
type Recorder interface {
LogEvent(payload EventPayload)
}
type Client interface {
Recorder
Close()
CloseWithTimeout(timeout time.Duration)
}
type Sink interface {
RecordAnalyticsEvents(ctx context.Context, events Events) error
}
type nullSink struct{}
func (n *nullSink) RecordAnalyticsEvents(_ context.Context, _ Events) error {
return nil
}
// NullSink is an analytics sink to use in the event that we don't want to send
// analytics
var NullSink = &nullSink{}
type client struct {
ch chan<- EventPayload
cancel func()
worker *worker
}
type worker struct {
buffer []EventPayload
ch <-chan EventPayload
ctx context.Context
doneSemaphore util.Semaphore
sessionID uuid.UUID
sink Sink
wg sync.WaitGroup
logger hclog.Logger
}
const bufferThreshold = 10
const eventTimeout = 200 * time.Millisecond
const noTimeout = 24 * time.Hour
const requestTimeout = 10 * time.Second
func newWorker(ctx context.Context, ch <-chan EventPayload, sink Sink, logger hclog.Logger) *worker {
buffer := []EventPayload{}
sessionID := uuid.New()
w := &worker{
buffer: buffer,
ch: ch,
ctx: ctx,
doneSemaphore: util.NewSemaphore(1),
sessionID: sessionID,
sink: sink,
logger: logger,
}
w.doneSemaphore.Acquire()
go w.analyticsClient()
return w
}
func NewClient(parent context.Context, sink Sink, logger hclog.Logger) Client {
ch := make(chan EventPayload)
ctx, cancel := context.WithCancel(parent)
// creates and starts the worker
worker := newWorker(ctx, ch, sink, logger)
s := &client{
ch: ch,
cancel: cancel,
worker: worker,
}
return s
}
func (s *client) LogEvent(event EventPayload) {
s.ch <- event
}
func (s *client) Close() {
s.cancel()
s.worker.Wait()
}
func (s *client) CloseWithTimeout(timeout time.Duration) {
ch := make(chan struct{})
go func() {
s.Close()
close(ch)
}()
select {
case <-ch:
case <-time.After(timeout):
}
}
func (w *worker) Wait() {
w.doneSemaphore.Acquire()
w.wg.Wait()
}
func (w *worker) analyticsClient() {
timeout := time.After(noTimeout)
for {
select {
case e := <-w.ch:
w.buffer = append(w.buffer, e)
if len(w.buffer) == bufferThreshold {
w.flush()
timeout = time.After(noTimeout)
} else {
timeout = time.After(eventTimeout)
}
case <-timeout:
w.flush()
timeout = time.After(noTimeout)
case <-w.ctx.Done():
w.flush()
w.doneSemaphore.Release()
return
}
}
}
func (w *worker) flush() {
if len(w.buffer) > 0 {
w.sendEvents(w.buffer)
w.buffer = []EventPayload{}
}
}
func (w *worker) sendEvents(events []EventPayload) {
w.wg.Add(1)
go func() {
defer w.wg.Done()
payload, err := addSessionID(w.sessionID.String(), events)
if err != nil {
w.logger.Debug("failed to encode cache usage analytics", "error", err)
return
}
ctx, cancel := context.WithTimeout(context.Background(), requestTimeout)
defer cancel()
err = w.sink.RecordAnalyticsEvents(ctx, payload)
if err != nil {
w.logger.Debug("failed to record cache usage analytics", "error", err)
}
}()
}
func addSessionID(sessionID string, events []EventPayload) (Events, error) {
eventMaps := []map[string]interface{}{}
err := mapstructure.Decode(events, &eventMaps)
if err != nil {
return nil, err
}
for _, event := range eventMaps {
event["sessionId"] = sessionID
}
return eventMaps, nil
}