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span_reader.go
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/
span_reader.go
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/**
* Copyright 2022 Cisco Systems, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package spanreaderes
import (
"context"
"fmt"
"github.com/teletrace/teletrace/pkg/model"
"github.com/teletrace/teletrace/pkg/model/metadata/v1"
"github.com/teletrace/teletrace/pkg/model/tagsquery/v1"
"github.com/teletrace/teletrace/pkg/spanreader"
"github.com/teletrace/teletrace/plugin/spanreader/es/metadatacontroller"
"github.com/teletrace/teletrace/plugin/spanreader/es/searchcontroller"
"github.com/teletrace/teletrace/plugin/spanreader/es/tagscontroller"
spansquery "github.com/teletrace/teletrace/pkg/model/spansquery/v1"
"go.uber.org/zap"
)
const spanIdField = "span.spanId"
type spanReader struct {
cfg ElasticConfig
logger *zap.Logger
ctx context.Context
searchController searchcontroller.SearchController
tagsController tagscontroller.TagsController
metadataController metadatacontroller.MetadataController
}
func (sr *spanReader) Search(ctx context.Context, r spansquery.SearchRequest) (*spansquery.SearchResponse, error) {
if r.Sort == nil || len(r.Sort) == 0 {
r.Sort = []spansquery.Sort{{Field: spanIdField, Ascending: true}}
}
sr.convertFilterKeysToKeywords(r.SearchFilters)
sr.optimizeSort(r.Sort)
res, err := sr.searchController.Search(ctx, r)
if err != nil {
return nil, fmt.Errorf("Could not index document: %+v", err)
}
return res, nil
}
func (sr *spanReader) optimizeSort(s []spansquery.Sort) {
for i, sort := range s {
if sort.Field == spanIdField {
// Mapping span id field to Elasticsearch 'keyword' which offers better performance
s[i].Field = spansquery.SortField(fmt.Sprintf("%s.keyword", sort.Field))
}
}
}
func (sr *spanReader) GetAvailableTags(ctx context.Context, r tagsquery.GetAvailableTagsRequest) (*tagsquery.GetAvailableTagsResponse, error) {
res, err := sr.tagsController.GetAvailableTags(ctx, r)
if err != nil {
return nil, fmt.Errorf("GetAvailableTags failed with error: %+v", err)
}
return &res, nil
}
func (sr *spanReader) GetTagsValues(
ctx context.Context, r tagsquery.TagValuesRequest, tags []string,
) (map[string]*tagsquery.TagValuesResponse, error) {
sr.convertFilterKeysToKeywords(r.SearchFilters)
res, err := sr.tagsController.GetTagsValues(ctx, r, tags)
if err != nil {
return nil, fmt.Errorf("GetTagsValues failed with error: %+v", err)
}
return res, nil
}
func (sr *spanReader) GetTagsStatistics(ctx context.Context, r tagsquery.TagStatisticsRequest, tag string) (*tagsquery.TagStatisticsResponse, error) {
res, err := sr.tagsController.GetTagsStatistics(ctx, r, tag)
if err != nil {
return nil, fmt.Errorf("GetTagsStatistics failed with error: %+v", err)
}
return res, nil
}
func (sr *spanReader) convertFilterKeysToKeywords(filters []model.SearchFilter) {
// Converting every filter key to Elasticsearch 'keyword' which guarantees that the string will be a single token
for _, f := range filters {
switch f.KeyValueFilter.Value.(type) {
case string:
f.KeyValueFilter.Key = model.FilterKey(fmt.Sprintf("%s.keyword", f.KeyValueFilter.Key))
}
}
}
func (sr *spanReader) GetSystemId(ctx context.Context, r metadata.GetSystemIdRequest) (*metadata.GetSystemIdResponse, error) {
res, err := sr.metadataController.GetSystemId(ctx)
if err != nil {
return nil, fmt.Errorf("GetSystemId failed with error: %+v", err)
}
return res, nil
}
func (sr *spanReader) SetSystemId(ctx context.Context, r metadata.SetSystemIdRequest) (*metadata.SetSystemIdResponse, error) {
res, err := sr.metadataController.SetSystemId(ctx, r)
if err != nil {
return nil, fmt.Errorf("GetSystemId failed with error: %+v", err)
}
return res, nil
}
func (sr *spanReader) Initialize() error {
// This method may be implemented for other databases, not needed in ES.
return nil
}
func NewSpanReader(ctx context.Context, logger *zap.Logger, elasticSpansCfg ElasticConfig, elasticMetaCfg ElasticConfig) (spanreader.SpanReader, error) {
errMsg := "cannot create a new span reader: %w"
rawClient, err := newRawClient(logger, elasticSpansCfg)
if err != nil {
return nil, fmt.Errorf(errMsg, err)
}
typedClient, err := newTypedClient(logger, elasticSpansCfg)
if err != nil {
return nil, fmt.Errorf(errMsg, err)
}
sc, err := searchcontroller.NewSearchController(logger, typedClient, elasticSpansCfg.Index)
if err != nil {
return nil, fmt.Errorf(errMsg, err)
}
tc, err := tagscontroller.NewTagsController(logger, rawClient, typedClient, elasticSpansCfg.Index)
if err != nil {
return nil, fmt.Errorf(errMsg, err)
}
metaTypedClient, err := newTypedClient(logger, elasticMetaCfg)
if err != nil {
return nil, fmt.Errorf(errMsg, err)
}
mc, err := metadatacontroller.NewMetadataController(logger, metaTypedClient, elasticMetaCfg.Index)
if err != nil {
return nil, fmt.Errorf(errMsg, err)
}
return &spanReader{
cfg: elasticSpansCfg,
logger: logger,
ctx: ctx,
searchController: sc,
tagsController: tc,
metadataController: mc,
}, nil
}