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mock_backend.go
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/
mock_backend.go
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// Copyright The OpenTelemetry Authors
// SPDX-License-Identifier: Apache-2.0
package testbed // import "github.com/open-telemetry/opentelemetry-collector-contrib/testbed/testbed"
import (
"context"
"errors"
"log"
"math/rand"
"os"
"sync"
"sync/atomic"
"time"
"go.opentelemetry.io/collector/consumer"
"go.opentelemetry.io/collector/consumer/consumererror"
"go.opentelemetry.io/collector/pdata/plog"
"go.opentelemetry.io/collector/pdata/pmetric"
"go.opentelemetry.io/collector/pdata/ptrace"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/status"
)
var errNonPermanent = errors.New("non permanent error")
var errPermanent = errors.New("permanent error")
type decisionFunc func() error
// MockBackend is a backend that allows receiving the data locally.
type MockBackend struct {
// Metric and trace consumers
tc *MockTraceConsumer
mc *MockMetricConsumer
lc *MockLogConsumer
receiver DataReceiver
// Log file
logFilePath string
logFile *os.File
// Start/stop flags
isStarted bool
stopOnce sync.Once
startedAt time.Time
startMutex sync.Mutex
// Recording fields.
isRecording bool
recordMutex sync.Mutex
ReceivedTraces []ptrace.Traces
ReceivedMetrics []pmetric.Metrics
ReceivedLogs []plog.Logs
DroppedTraces []ptrace.Traces
DroppedMetrics []pmetric.Metrics
DroppedLogs []plog.Logs
LogsToRetry []plog.Logs
// decision to return permanent/non-permanent errors
decision decisionFunc
}
// NewMockBackend creates a new mock backend that receives data using specified receiver.
func NewMockBackend(logFilePath string, receiver DataReceiver) *MockBackend {
mb := &MockBackend{
logFilePath: logFilePath,
receiver: receiver,
tc: &MockTraceConsumer{},
mc: &MockMetricConsumer{},
lc: &MockLogConsumer{},
decision: func() error { return nil },
}
mb.tc.backend = mb
mb.mc.backend = mb
mb.lc.backend = mb
return mb
}
func (mb *MockBackend) WithDecisionFunc(decision decisionFunc) {
mb.decision = decision
}
// Start a backend.
func (mb *MockBackend) Start() error {
log.Printf("Starting mock backend...")
var err error
// Open log file
mb.logFile, err = os.Create(mb.logFilePath)
if err != nil {
return err
}
err = mb.receiver.Start(mb.tc, mb.mc, mb.lc)
if err != nil {
return err
}
mb.isStarted = true
mb.startMutex.Lock()
defer mb.startMutex.Unlock()
mb.startedAt = time.Now()
return nil
}
// Stop the backend
func (mb *MockBackend) Stop() {
mb.stopOnce.Do(func() {
if !mb.isStarted {
return
}
log.Printf("Stopping mock backend...")
mb.logFile.Close()
if err := mb.receiver.Stop(); err != nil {
log.Printf("Failed to stop receiver: %v", err)
}
// Print stats.
log.Printf("Stopped backend. %s", mb.GetStats())
})
}
// EnableRecording enables recording of all data received by MockBackend.
func (mb *MockBackend) EnableRecording() {
mb.recordMutex.Lock()
defer mb.recordMutex.Unlock()
mb.isRecording = true
}
func (mb *MockBackend) GetStats() string {
mb.startMutex.Lock()
defer mb.startMutex.Unlock()
received := mb.DataItemsReceived()
return printer.Sprintf("Received:%10d items (%d/sec)", received, int(float64(received)/time.Since(mb.startedAt).Seconds()))
}
// DataItemsReceived returns total number of received spans and metrics.
func (mb *MockBackend) DataItemsReceived() uint64 {
return mb.tc.numSpansReceived.Load() + mb.mc.numMetricsReceived.Load() + mb.lc.numLogRecordsReceived.Load()
}
// ClearReceivedItems clears the list of received traces and metrics. Note: counters
// return by DataItemsReceived() are not cleared, they are cumulative.
func (mb *MockBackend) ClearReceivedItems() {
mb.recordMutex.Lock()
defer mb.recordMutex.Unlock()
mb.ReceivedTraces = nil
mb.ReceivedMetrics = nil
mb.ReceivedLogs = nil
}
func (mb *MockBackend) ConsumeTrace(td ptrace.Traces) {
mb.recordMutex.Lock()
defer mb.recordMutex.Unlock()
if mb.isRecording {
mb.ReceivedTraces = append(mb.ReceivedTraces, td)
}
}
func (mb *MockBackend) ConsumeMetric(md pmetric.Metrics) {
mb.recordMutex.Lock()
defer mb.recordMutex.Unlock()
if mb.isRecording {
mb.ReceivedMetrics = append(mb.ReceivedMetrics, md)
}
}
var _ consumer.Traces = (*MockTraceConsumer)(nil)
func (mb *MockBackend) ConsumeLogs(ld plog.Logs) {
if mb.isRecording {
mb.ReceivedLogs = append(mb.ReceivedLogs, ld)
}
}
type MockTraceConsumer struct {
numSpansReceived atomic.Uint64
backend *MockBackend
}
func (tc *MockTraceConsumer) Capabilities() consumer.Capabilities {
return consumer.Capabilities{MutatesData: false}
}
func (tc *MockTraceConsumer) ConsumeTraces(_ context.Context, td ptrace.Traces) error {
if err := tc.backend.decision(); err != nil {
if consumererror.IsPermanent(err) && tc.backend.isRecording {
tc.backend.DroppedTraces = append(tc.backend.DroppedTraces, td)
}
return err
}
rs := td.ResourceSpans()
for i := 0; i < rs.Len(); i++ {
ils := rs.At(i).ScopeSpans()
for j := 0; j < ils.Len(); j++ {
spans := ils.At(j).Spans()
for k := 0; k < spans.Len(); k++ {
span := spans.At(k)
var spanSeqnum int64
var traceSeqnum int64
seqnumAttr, ok := span.Attributes().Get("load_generator.span_seq_num")
if ok {
spanSeqnum = seqnumAttr.Int()
}
seqnumAttr, ok = span.Attributes().Get("load_generator.trace_seq_num")
if ok {
traceSeqnum = seqnumAttr.Int()
}
// Ignore the seqnums for now. We will use them later.
_ = spanSeqnum
_ = traceSeqnum
}
}
}
tc.backend.ConsumeTrace(td)
tc.numSpansReceived.Add(uint64(td.SpanCount()))
return nil
}
var _ consumer.Metrics = (*MockMetricConsumer)(nil)
type MockMetricConsumer struct {
numMetricsReceived atomic.Uint64
backend *MockBackend
}
func (mc *MockMetricConsumer) Capabilities() consumer.Capabilities {
return consumer.Capabilities{MutatesData: false}
}
func (mc *MockMetricConsumer) ConsumeMetrics(_ context.Context, md pmetric.Metrics) error {
if err := mc.backend.decision(); err != nil {
if consumererror.IsPermanent(err) && mc.backend.isRecording {
mc.backend.DroppedMetrics = append(mc.backend.DroppedMetrics, md)
}
return err
}
mc.numMetricsReceived.Add(uint64(md.DataPointCount()))
mc.backend.ConsumeMetric(md)
return nil
}
func (tc *MockTraceConsumer) MockConsumeTraceData(spanCount int) error {
tc.numSpansReceived.Add(uint64(spanCount))
return nil
}
func (mc *MockMetricConsumer) MockConsumeMetricData(metricsCount int) error {
mc.numMetricsReceived.Add(uint64(metricsCount))
return nil
}
type MockLogConsumer struct {
numLogRecordsReceived atomic.Uint64
backend *MockBackend
}
func (lc *MockLogConsumer) Capabilities() consumer.Capabilities {
return consumer.Capabilities{MutatesData: false}
}
func (lc *MockLogConsumer) ConsumeLogs(_ context.Context, ld plog.Logs) error {
lc.backend.recordMutex.Lock()
defer lc.backend.recordMutex.Unlock()
if err := lc.backend.decision(); err != nil {
if lc.backend.isRecording {
if consumererror.IsPermanent(err) {
lc.backend.DroppedLogs = append(lc.backend.DroppedLogs, ld)
} else {
lc.backend.LogsToRetry = append(lc.backend.LogsToRetry, ld)
}
}
return err
}
recordCount := ld.LogRecordCount()
lc.numLogRecordsReceived.Add(uint64(recordCount))
lc.backend.ConsumeLogs(ld)
return nil
}
// randomNonPermanentError is a decision function that succeeds approximately
// half of the time and fails with a non-permanent error the rest of the time.
func RandomNonPermanentError() error {
code := codes.Unavailable
s := status.New(code, errNonPermanent.Error())
if rand.Float32() < 0.5 {
return s.Err()
}
return nil
}
func GenerateNonPernamentErrorUntil(ch chan bool) error {
code := codes.Unavailable
s := status.New(code, errNonPermanent.Error())
defaultReturn := s.Err()
if <-ch {
return defaultReturn
}
return nil
}
// randomPermanentError is a decision function that succeeds approximately
// half of the time and fails with a permanent error the rest of the time.
func RandomPermanentError() error {
if rand.Float32() < 0.5 {
return consumererror.NewPermanent(errPermanent)
}
return nil
}