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storage.go
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storage.go
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// Copyright (c) 2017 Uber Technologies, 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 dependencystore
import (
"context"
"encoding/json"
"time"
"github.com/pkg/errors"
"go.uber.org/zap"
"gopkg.in/olivere/elastic.v5"
"github.com/jaegertracing/jaeger/model"
"github.com/jaegertracing/jaeger/pkg/es"
)
const (
dependencyType = "dependencies"
dependencyIndexPrefix = "jaeger-dependencies-"
)
type timeToDependencies struct {
Timestamp time.Time `json:"timestamp"`
Dependencies []model.DependencyLink `json:"dependencies"`
}
// DependencyStore handles all queries and insertions to ElasticSearch dependencies
type DependencyStore struct {
ctx context.Context
client es.Client
logger *zap.Logger
}
// NewDependencyStore returns a DependencyStore
func NewDependencyStore(client es.Client, logger *zap.Logger) *DependencyStore {
return &DependencyStore{
ctx: context.Background(),
client: client,
logger: logger,
}
}
// WriteDependencies implements dependencystore.Writer#WriteDependencies.
func (s *DependencyStore) WriteDependencies(ts time.Time, dependencies []model.DependencyLink) error {
indexName := indexName(ts)
if err := s.createIndex(indexName); err != nil {
return err
}
return s.writeDependencies(indexName, ts, dependencies)
}
func (s *DependencyStore) createIndex(indexName string) error {
_, err := s.client.CreateIndex(indexName).Body(dependenciesMapping).Do(s.ctx)
if err != nil {
return errors.Wrap(err, "Failed to create index")
}
return nil
}
func (s *DependencyStore) writeDependencies(indexName string, ts time.Time, dependencies []model.DependencyLink) error {
_, err := s.client.Index().Index(indexName).
Type(dependencyType).
BodyJson(&timeToDependencies{
Timestamp: ts,
Dependencies: dependencies,
}).
Do(s.ctx)
if err != nil {
return errors.Wrap(err, "Failed to write dependencies")
}
return nil
}
// GetDependencies returns all interservice dependencies
func (s *DependencyStore) GetDependencies(endTs time.Time, lookback time.Duration) ([]model.DependencyLink, error) {
searchResult, err := s.client.Search(getIndices(endTs, lookback)...).
Type(dependencyType).
Size(10000). // the default elasticsearch allowed limit
Query(buildTSQuery(endTs, lookback)).
IgnoreUnavailable(true).
Do(s.ctx)
if err != nil {
return nil, errors.Wrap(err, "Failed to search for dependencies")
}
var retDependencies []model.DependencyLink
hits := searchResult.Hits.Hits
for _, hit := range hits {
source := hit.Source
var tToD timeToDependencies
if err := json.Unmarshal(*source, &tToD); err != nil {
return nil, errors.New("Unmarshalling ElasticSearch documents failed")
}
retDependencies = append(retDependencies, tToD.Dependencies...)
}
return retDependencies, nil
}
func buildTSQuery(endTs time.Time, lookback time.Duration) elastic.Query {
return elastic.NewRangeQuery("timestamp").Gte(endTs.Add(-lookback)).Lte(endTs)
}
func getIndices(ts time.Time, lookback time.Duration) []string {
var indices []string
firstIndex := indexName(ts.Add(-lookback))
currentIndex := indexName(ts)
for currentIndex != firstIndex {
indices = append(indices, currentIndex)
ts = ts.Add(-24 * time.Hour)
currentIndex = indexName(ts)
}
return append(indices, firstIndex)
}
func indexName(date time.Time) string {
return dependencyIndexPrefix + date.UTC().Format("2006-01-02")
}