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dependency_store.go
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dependency_store.go
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// Copyright (c) 2020 The Jaeger Authors.
//
// 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 esdependencyreader
import (
"bytes"
"context"
"encoding/json"
"fmt"
"strings"
"time"
"go.uber.org/zap"
"github.com/jaegertracing/jaeger/cmd/opentelemetry/app/internal/esclient"
"github.com/jaegertracing/jaeger/model"
"github.com/jaegertracing/jaeger/plugin/storage/es/dependencystore/dbmodel"
"github.com/jaegertracing/jaeger/storage/dependencystore"
)
const (
dependencyType = "dependencies"
dependencyIndexBaseName = "jaeger-dependencies"
timestampField = "timestamp"
)
// DependencyStore defines Elasticsearch dependency store.
type DependencyStore struct {
client esclient.ElasticsearchClient
logger *zap.Logger
indexPrefix string
indexDateLayout string
maxDocCount int
}
var _ dependencystore.Reader = (*DependencyStore)(nil)
var _ dependencystore.Writer = (*DependencyStore)(nil)
// NewDependencyStore creates dependency store.
func NewDependencyStore(client esclient.ElasticsearchClient, logger *zap.Logger, indexPrefix, indexDateLayout string, maxDocCount int) *DependencyStore {
if indexPrefix != "" {
indexPrefix += "-"
}
return &DependencyStore{
client: client,
logger: logger,
indexPrefix: indexPrefix + dependencyIndexBaseName + "-",
indexDateLayout: indexDateLayout,
maxDocCount: maxDocCount,
}
}
// CreateTemplates creates index templates for dependency index
func (r *DependencyStore) CreateTemplates(dependenciesTemplate string) error {
return r.client.PutTemplate(context.Background(), dependencyIndexBaseName, strings.NewReader(dependenciesTemplate))
}
// WriteDependencies implements dependencystore.Writer
func (r *DependencyStore) WriteDependencies(ts time.Time, dependencies []model.DependencyLink) error {
d := &dbmodel.TimeDependencies{
Timestamp: ts,
Dependencies: dbmodel.FromDomainDependencies(dependencies),
}
data, err := json.Marshal(d)
if err != nil {
return err
}
return r.client.Index(context.Background(), bytes.NewReader(data), indexWithDate(r.indexPrefix, r.indexDateLayout, ts), dependencyType)
}
// GetDependencies implements dependencystore.Reader
func (r *DependencyStore) GetDependencies(ctx context.Context, endTs time.Time, lookback time.Duration) ([]model.DependencyLink, error) {
searchBody := getSearchBody(endTs, lookback, r.maxDocCount)
indices := dailyIndices(r.indexPrefix, r.indexDateLayout, endTs, lookback)
response, err := r.client.Search(ctx, searchBody, r.maxDocCount, indices...)
if err != nil {
return nil, err
}
if response.Error != nil {
return nil, fmt.Errorf("%s", response.Error)
}
var dependencies []dbmodel.DependencyLink
for _, hit := range response.Hits.Hits {
var d dbmodel.TimeDependencies
if err := json.Unmarshal(*hit.Source, &d); err != nil {
return nil, err
}
dependencies = append(dependencies, d.Dependencies...)
}
return dbmodel.ToDomainDependencies(dependencies), nil
}
func getSearchBody(endTs time.Time, lookback time.Duration, maxDocCount int) esclient.SearchBody {
return esclient.SearchBody{
Query: &esclient.Query{
RangeQueries: map[string]esclient.RangeQuery{timestampField: {GTE: endTs.Add(-lookback), LTE: endTs}},
},
Size: maxDocCount,
}
}
func indexWithDate(indexNamePrefix, indexDateLayout string, date time.Time) string {
return indexNamePrefix + date.UTC().Format(indexDateLayout)
}
func dailyIndices(prefix, format string, ts time.Time, lookback time.Duration) []string {
var indices []string
firstIndex := indexWithDate(prefix, format, ts.Add(-lookback))
currentIndex := indexWithDate(prefix, format, ts)
for currentIndex != firstIndex {
indices = append(indices, currentIndex)
ts = ts.Add(-24 * time.Hour)
currentIndex = indexWithDate(prefix, format, ts)
}
return append(indices, firstIndex)
}