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traceFinder.go
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traceFinder.go
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package store
import (
"context"
"fmt"
"math"
"time"
"github.com/jaegertracing/jaeger/storage/spanstore"
"github.com/logzio/jaeger-logzio/store/objects"
"github.com/opentracing/opentracing-go"
"github.com/avast/retry-go"
"github.com/hashicorp/go-hclog"
"github.com/jaegertracing/jaeger/model"
"github.com/jaegertracing/jaeger/plugin/storage/es/spanstore/dbmodel"
"github.com/olivere/elastic"
"github.com/pkg/errors"
)
const (
maxRetryAttempts = 4
maxBulkSize = 100
)
// TraceFinder object builds search request from traceIDs and parse the result to traces
type TraceFinder struct {
logger hclog.Logger
sourceFn sourceFn
spanConverter dbmodel.ToDomain
reader *LogzioSpanReader
}
// NewTraceFinder creates trace finder object
func NewTraceFinder(reader *LogzioSpanReader) TraceFinder {
return TraceFinder{
logger: reader.logger,
sourceFn: getSourceFn(),
reader: reader,
spanConverter: dbmodel.NewToDomain(objects.TagDotReplacementCharacter),
}
}
func (finder *TraceFinder) traceIDsMultiSearchRequestBody(traceIDs []model.TraceID, nextTime uint64, endTime time.Time, searchAfterTime map[model.TraceID]uint64) string {
multiSearchBody := ""
for _, traceID := range traceIDs {
finder.logger.Debug(fmt.Sprintf("creating request for trace %s", traceID.String()))
traceIDTerm := elastic.NewTermQuery(traceIDField, traceID.String())
rangeQuery := elastic.NewRangeQuery(startTimeField).Gte(nextTime).Lte(model.TimeAsEpochMicroseconds(endTime))
query := elastic.NewBoolQuery().Filter(traceIDTerm, rangeQuery)
if val, ok := searchAfterTime[traceID]; ok {
nextTime = val
}
source := finder.sourceFn(query, nextTime)
searchRequest := elastic.NewSearchRequest().
IgnoreUnavailable(true).
Source(source)
requestBody, err := searchRequest.Body()
if err != nil {
finder.logger.Warn(fmt.Sprintf("can't create search request for traceID %s, skipping..", traceID.String()))
continue
}
// add search {}\n to prefix and \n to suffix of the search request to match it to multiSearch format
multiSearchBody = fmt.Sprintf("%s{}\n%s\n", multiSearchBody, requestBody)
}
return multiSearchBody
}
func (finder *TraceFinder) getTracesToChannel(traceIDs []model.TraceID, tracesChan chan *model.Trace, startTime time.Time, endTime time.Time) error {
nextTime := model.TimeAsEpochMicroseconds(startTime)
searchAfterTime := make(map[model.TraceID]uint64)
totalDocumentsFetched := make(map[model.TraceID]int)
tracesMap := make(map[model.TraceID]*model.Trace)
for {
if len(traceIDs) == 0 {
break
}
multiSearchBody := finder.traceIDsMultiSearchRequestBody(traceIDs, nextTime, endTime, searchAfterTime)
// set traceIDs to empty
traceIDs = nil
results, err := finder.reader.getMultiSearchResult(multiSearchBody)
if err != nil || results.Responses == nil || len(results.Responses) == 0 {
if err != nil {
return err
}
break
}
for _, result := range results.Responses {
if result.Hits == nil || len(result.Hits.Hits) == 0 {
tracesChan <- nil
continue
}
spans, err := finder.collectSpans(result.Hits.Hits)
if err != nil {
finder.logger.Warn(fmt.Sprintf("can't collect spans form result: %s", err.Error()))
tracesChan <- nil
continue
}
lastSpan := spans[len(spans)-1]
if traceSpan, ok := tracesMap[lastSpan.TraceID]; ok {
traceSpan.Spans = append(traceSpan.Spans, spans...)
} else {
tracesMap[lastSpan.TraceID] = &model.Trace{Spans: spans}
}
totalDocumentsFetched[lastSpan.TraceID] = totalDocumentsFetched[lastSpan.TraceID] + len(result.Hits.Hits)
if totalDocumentsFetched[lastSpan.TraceID] < int(result.TotalHits()) {
traceIDs = append(traceIDs, lastSpan.TraceID)
searchAfterTime[lastSpan.TraceID] = model.TimeAsEpochMicroseconds(lastSpan.StartTime)
}
}
}
finder.logger.Debug(fmt.Sprintf("%d traces return", len(tracesMap)))
if len(tracesMap) == 0 {
return errors.New(fmt.Sprintf("No search results for traces: %v", traceIDs))
}
for traceID := range tracesMap {
tracesChan <- tracesMap[traceID]
}
return nil
}
func (finder *TraceFinder) collectSpans(esSpansRaw []*elastic.SearchHit) ([]*model.Span, error) {
spans := make([]*model.Span, len(esSpansRaw))
for i, esSpanRaw := range esSpansRaw {
jsonSpan, err := unmarshalJSONSpan(esSpanRaw)
if err != nil {
return nil, errors.Wrap(err, "Marshalling JSON to span object failed")
}
dbSpan := jsonSpan.TransformToDbModelSpan()
span, err := finder.spanConverter.SpanToDomain(dbSpan)
if err != nil {
return nil, errors.Wrap(err, "Converting JSONSpan to domain Span failed")
}
spans[i] = span
}
return spans, nil
}
func (finder *TraceFinder) bulkSearchWithRetry(traceIDs []model.TraceID, tracesChan chan *model.Trace, startTime, endTime time.Time, bulkIndex int) {
err := retry.Do( // retry in case one of the bulk requests failed
func() error {
finder.logger.Debug(fmt.Sprintf("processing bulk %v", bulkIndex))
return finder.getTracesToChannel(traceIDs, tracesChan, startTime, endTime)
},
retry.Attempts(maxRetryAttempts),
retry.Delay(time.Millisecond*500),
retry.OnRetry(
func(n uint, err error) {
finder.logger.Debug(fmt.Sprintf("retrying bulk %d retry %d/%d", bulkIndex, n+1, maxRetryAttempts))
}),
)
if err != nil {
finder.logger.Error(fmt.Sprintf("failed to fetch bulk %d with %d traces: %s", bulkIndex, len(traceIDs), err.Error()))
}
}
func (finder *TraceFinder) multiRead(traceIDs []model.TraceID, startTime, endTime time.Time) ([]*model.Trace, error) {
if len(traceIDs) == 0 {
return []*model.Trace{}, nil
}
tracesChan := make(chan *model.Trace)
requestBulksCount := int(math.Ceil(float64(len(traceIDs)) / float64(maxBulkSize)))
finder.logger.Debug(fmt.Sprintf("performing %v bulk searches for %v traceIDs", requestBulksCount, len(traceIDs)))
expectedTraceCount := len(traceIDs)
for i := 0; i < requestBulksCount; i++ {
bulkStartOffset := i * maxBulkSize
bulkEnd := int(math.Min(float64(bulkStartOffset+maxBulkSize), float64(len(traceIDs))))
go finder.bulkSearchWithRetry(traceIDs[bulkStartOffset:bulkEnd], tracesChan, startTime, endTime, i+1)
time.Sleep(time.Millisecond * 300)
}
var traces []*model.Trace
timeout := false
for i := 0; i < expectedTraceCount && !timeout; i++ {
select {
case trace := <-tracesChan:
if trace != nil {
traces = append(traces, trace)
} else {
finder.logger.Warn("missing a trace...")
}
case <-time.After(15 * time.Second): // continue if there are no traces in the channel for 15 seconds
{
finder.logger.Warn("got timeout while waiting for response")
timeout = true
}
}
}
return traces, nil
}
func (finder *TraceFinder) findTraceIDsStrings(ctx context.Context, traceQuery *spanstore.TraceQueryParameters) ([]string, error) {
childSpan, _ := opentracing.StartSpanFromContext(ctx, "findTraceIDsStrings")
defer childSpan.Finish()
aggregation := buildTraceIDAggregation(traceQuery.NumTraces)
boolQuery := finder.buildFindTraceIDsQuery(traceQuery)
searchService := elastic.NewSearchRequest().
Size(0). // set to 0 because we don't want actual documents.
Aggregation(traceIDAggregation, aggregation).
IgnoreUnavailable(true).
Query(boolQuery)
requestBody, err := searchService.Body()
if err != nil {
return nil, errors.Wrap(err, "can't create search request for trace query")
}
requestBody = fmt.Sprintf("{}\n%s\n", requestBody)
searchResult, err := finder.reader.getSearchResult(requestBody)
if err != nil {
return nil, errors.Wrap(err, "Search service failed")
}
bucket, found := searchResult.Aggregations.Terms(traceIDAggregation)
if !found {
return nil, ErrUnableToFindTraceIDAggregation
}
traceIDBuckets := bucket.Buckets
return bucketToStringArray(traceIDBuckets)
}
func (finder *TraceFinder) buildTagQuery(k string, v string) elastic.Query {
objectTagListLen := len(objectTagFieldList)
queries := make([]elastic.Query, objectTagListLen)
kd := finder.spanConverter.ReplaceDot(k)
for i := range objectTagFieldList {
queries[i] = buildObjectQuery(objectTagFieldList[i], kd, v)
}
// but configuration can change over time
return elastic.NewBoolQuery().Should(queries...)
}
func (finder *TraceFinder) buildFindTraceIDsQuery(traceQuery *spanstore.TraceQueryParameters) elastic.Query {
boolQuery := elastic.NewBoolQuery()
//add duration query
if traceQuery.DurationMax != 0 || traceQuery.DurationMin != 0 {
durationQuery := buildDurationQuery(traceQuery.DurationMin, traceQuery.DurationMax)
boolQuery.Must(durationQuery)
}
//add startTime query
startTimeQuery := buildStartTimeQuery(traceQuery.StartTimeMin, traceQuery.StartTimeMax)
boolQuery.Must(startTimeQuery)
//add process.serviceName query
if traceQuery.ServiceName != "" {
serviceNameQuery := buildServiceNameQuery(traceQuery.ServiceName)
boolQuery.Must(serviceNameQuery)
}
//add operationName query
if traceQuery.OperationName != "" {
operationNameQuery := buildOperationNameQuery(traceQuery.OperationName)
boolQuery.Must(operationNameQuery)
}
for k, v := range traceQuery.Tags {
tagQuery := finder.buildTagQuery(k, v)
boolQuery.Must(tagQuery)
}
return boolQuery
}