/
file_reader.go
341 lines (311 loc) · 9.19 KB
/
file_reader.go
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// Copyright The OpenTelemetry Authors
// SPDX-License-Identifier: Apache-2.0
package filereceiver // import "github.com/f5/otel-arrow-adapter/collector/receiver/filereceiver"
import (
"bufio"
"context"
"encoding/binary"
"errors"
"fmt"
"io"
"os"
"github.com/klauspost/compress/zstd"
"go.opentelemetry.io/collector/pdata/pcommon"
"go.opentelemetry.io/collector/pdata/plog"
"go.opentelemetry.io/collector/pdata/pmetric"
"go.opentelemetry.io/collector/pdata/ptrace"
)
// stringReader is the only function we use from *bufio.Reader. We define it
// so that it can be swapped out for testing.
type stringReader interface {
ReadString(delim byte) (string, error)
Read(buf []byte) (int, error)
}
type unmarshaler struct {
metricsUnm pmetric.Unmarshaler
tracesUnm ptrace.Unmarshaler
logsUnm plog.Unmarshaler
}
// fileReader
type fileReader struct {
stringReader stringReader
unmarshaler unmarshaler
consumer consumerType
timer *replayTimer
}
func newFileReader(consumer consumerType, file *os.File, timer *replayTimer, format string, compression string) fileReader {
fr := fileReader{
consumer: consumer,
timer: timer,
}
if compression == compressionTypeZSTD {
cr, _ := zstd.NewReader(file)
fr.stringReader = bufio.NewReader(cr)
} else { // no compression
fr.stringReader = bufio.NewReader(file)
}
if format == formatTypeProto {
switch {
case fr.consumer.tracesConsumer != nil:
fr.unmarshaler.tracesUnm = &ptrace.ProtoUnmarshaler{}
case fr.consumer.logsConsumer != nil:
fr.unmarshaler.logsUnm = &plog.ProtoUnmarshaler{}
case fr.consumer.metricsConsumer != nil:
fr.unmarshaler.metricsUnm = &pmetric.ProtoUnmarshaler{}
}
} else { // default to json
switch {
case fr.consumer.tracesConsumer != nil:
fr.unmarshaler.tracesUnm = &ptrace.JSONUnmarshaler{}
case fr.consumer.logsConsumer != nil:
fr.unmarshaler.logsUnm = &plog.JSONUnmarshaler{}
case fr.consumer.metricsConsumer != nil:
fr.unmarshaler.metricsUnm = &pmetric.JSONUnmarshaler{}
}
}
return fr
}
// readAllLines calls readline for each line in the file until all lines have been
// read or the context is cancelled.
func (fr fileReader) readAllLines(ctx context.Context) error {
for {
select {
case <-ctx.Done():
return nil
default:
var err error
switch {
case fr.consumer.tracesConsumer != nil:
err = fr.readTraceLine(ctx)
case fr.consumer.metricsConsumer != nil:
err = fr.readMetricLine(ctx)
case fr.consumer.logsConsumer != nil:
err = fr.readLogLine(ctx)
}
if err != nil {
if errors.Is(err, io.EOF) {
return nil
}
return err
}
}
}
}
// readLogLine reads the next line in the file, converting it into logs and
// passing it to the the consumer member.
func (fr fileReader) readLogLine(ctx context.Context) error {
line, err := fr.stringReader.ReadString('\n')
if err != nil {
return fmt.Errorf("failed to read line from input file: %w", err)
}
logs, err := fr.unmarshaler.logsUnm.UnmarshalLogs([]byte(line))
if err != nil {
return fmt.Errorf("failed to unmarshal logs: %w", err)
}
err = fr.timer.wait(ctx, getFirstTimestampFromLogs(logs))
if err != nil {
return fmt.Errorf("readLine interrupted while waiting for timer: %w", err)
}
return fr.consumer.logsConsumer.ConsumeLogs(ctx, logs)
}
// readTraceLine reads the next line in the file, converting it into traces and
// passing it to the the consumer member.
func (fr fileReader) readTraceLine(ctx context.Context) error {
line, err := fr.stringReader.ReadString('\n')
if err != nil {
return fmt.Errorf("failed to read line from input file: %w", err)
}
traces, err := fr.unmarshaler.tracesUnm.UnmarshalTraces([]byte(line))
if err != nil {
return fmt.Errorf("failed to unmarshal traces: %w", err)
}
err = fr.timer.wait(ctx, getFirstTimestampFromTraces(traces))
if err != nil {
return fmt.Errorf("readLine interrupted while waiting for timer: %w", err)
}
return fr.consumer.tracesConsumer.ConsumeTraces(ctx, traces)
}
// readMetricLine reads the next line in the file, converting it into metrics and
// passing it to the the consumer member.
func (fr fileReader) readMetricLine(ctx context.Context) error {
line, err := fr.stringReader.ReadString('\n')
if err != nil {
return fmt.Errorf("failed to read line from input file: %w", err)
}
metrics, err := fr.unmarshaler.metricsUnm.UnmarshalMetrics([]byte(line))
if err != nil {
return fmt.Errorf("failed to unmarshal metrics: %w", err)
}
err = fr.timer.wait(ctx, getFirstTimestampFromMetrics(metrics))
if err != nil {
return fmt.Errorf("readLine interrupted while waiting for timer: %w", err)
}
return fr.consumer.metricsConsumer.ConsumeMetrics(ctx, metrics)
}
// readAllChunks reads the next chunk of data where each chunk is prefixed with
// the size of the data chunk.
func (fr fileReader) readAllChunks(ctx context.Context) error {
for {
select {
case <-ctx.Done():
return nil
default:
var err error
switch {
case fr.consumer.tracesConsumer != nil:
err = fr.readTraceChunk(ctx)
case fr.consumer.metricsConsumer != nil:
err = fr.readMetricChunk(ctx)
case fr.consumer.logsConsumer != nil:
err = fr.readLogChunk(ctx)
}
if err != nil {
if errors.Is(err, io.EOF) {
return nil
}
return err
}
}
}
}
func (fr fileReader) readMetricChunk(ctx context.Context) error {
var sz int32
err := binary.Read(fr.stringReader, binary.BigEndian, &sz)
if err != nil {
return err
}
dataBuffer := make([]byte, sz)
err = binary.Read(fr.stringReader, binary.BigEndian, &dataBuffer)
if err != nil {
return fmt.Errorf("failed to read line from input file: %w", err)
}
metrics, err := fr.unmarshaler.metricsUnm.UnmarshalMetrics(dataBuffer)
if err != nil {
return fmt.Errorf("failed to unmarshal metrics: %w", err)
}
err = fr.timer.wait(ctx, getFirstTimestampFromMetrics(metrics))
if err != nil {
return fmt.Errorf("readLine interrupted while waiting for timer: %w", err)
}
return fr.consumer.metricsConsumer.ConsumeMetrics(ctx, metrics)
}
func (fr fileReader) readTraceChunk(ctx context.Context) error {
var sz int32
err := binary.Read(fr.stringReader, binary.BigEndian, &sz)
if err != nil {
return err
}
dataBuffer := make([]byte, sz)
err = binary.Read(fr.stringReader, binary.BigEndian, &dataBuffer)
if err != nil {
return fmt.Errorf("failed to read line from input file: %w", err)
}
traces, err := fr.unmarshaler.tracesUnm.UnmarshalTraces(dataBuffer)
if err != nil {
return fmt.Errorf("failed to unmarshal traces: %w", err)
}
err = fr.timer.wait(ctx, getFirstTimestampFromTraces(traces))
if err != nil {
return fmt.Errorf("readLine interrupted while waiting for timer: %w", err)
}
return fr.consumer.tracesConsumer.ConsumeTraces(ctx, traces)
}
func (fr fileReader) readLogChunk(ctx context.Context) error {
var sz int32
err := binary.Read(fr.stringReader, binary.BigEndian, &sz)
if err != nil {
return err
}
dataBuffer := make([]byte, sz)
err = binary.Read(fr.stringReader, binary.BigEndian, &dataBuffer)
if err != nil {
return fmt.Errorf("failed to read line from input file: %w", err)
}
logs, err := fr.unmarshaler.logsUnm.UnmarshalLogs(dataBuffer)
if err != nil {
return fmt.Errorf("failed to unmarshal logs: %w", err)
}
err = fr.timer.wait(ctx, getFirstTimestampFromLogs(logs))
if err != nil {
return fmt.Errorf("readLine interrupted while waiting for timer: %w", err)
}
return fr.consumer.logsConsumer.ConsumeLogs(ctx, logs)
}
func getFirstTimestampFromLogs(logs plog.Logs) pcommon.Timestamp {
resourceLogs := logs.ResourceLogs()
if resourceLogs.Len() == 0 {
return 0
}
scopeLogs := resourceLogs.At(0).ScopeLogs()
if scopeLogs.Len() == 0 {
return 0
}
logSlice := scopeLogs.At(0).LogRecords()
if logSlice.Len() == 0 {
return 0
}
return logSlice.At(0).Timestamp()
}
func getFirstTimestampFromTraces(traces ptrace.Traces) pcommon.Timestamp {
resourceSpans := traces.ResourceSpans()
if resourceSpans.Len() == 0 {
return 0
}
scopeSpans := resourceSpans.At(0).ScopeSpans()
if scopeSpans.Len() == 0 {
return 0
}
spanSlice := scopeSpans.At(0).Spans()
if spanSlice.Len() == 0 {
return 0
}
return spanSlice.At(0).StartTimestamp()
}
func getFirstTimestampFromMetrics(metrics pmetric.Metrics) pcommon.Timestamp {
resourceMetrics := metrics.ResourceMetrics()
if resourceMetrics.Len() == 0 {
return 0
}
scopeMetrics := resourceMetrics.At(0).ScopeMetrics()
if scopeMetrics.Len() == 0 {
return 0
}
metricSlice := scopeMetrics.At(0).Metrics()
if metricSlice.Len() == 0 {
return 0
}
metric := metricSlice.At(0)
switch metric.Type() {
case pmetric.MetricTypeGauge:
dps := metric.Gauge().DataPoints()
if dps.Len() == 0 {
return 0
}
return dps.At(0).Timestamp()
case pmetric.MetricTypeSum:
dps := metric.Sum().DataPoints()
if dps.Len() == 0 {
return 0
}
return dps.At(0).Timestamp()
case pmetric.MetricTypeSummary:
dps := metric.Summary().DataPoints()
if dps.Len() == 0 {
return 0
}
return dps.At(0).Timestamp()
case pmetric.MetricTypeHistogram:
dps := metric.Histogram().DataPoints()
if dps.Len() == 0 {
return 0
}
return dps.At(0).Timestamp()
case pmetric.MetricTypeExponentialHistogram:
dps := metric.ExponentialHistogram().DataPoints()
if dps.Len() == 0 {
return 0
}
return dps.At(0).Timestamp()
}
return 0
}