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service_operation.go
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service_operation.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 spanstore
import (
"context"
"fmt"
"time"
"github.com/pkg/errors"
"github.com/uber/jaeger-lib/metrics"
"go.uber.org/zap"
"gopkg.in/olivere/elastic.v5"
jModel "github.com/jaegertracing/jaeger/model/json"
"github.com/jaegertracing/jaeger/pkg/cache"
"github.com/jaegertracing/jaeger/pkg/es"
storageMetrics "github.com/jaegertracing/jaeger/storage/spanstore/metrics"
)
const (
serviceName = "serviceName"
operationsAggregation = "distinct_operations"
servicesAggregation = "distinct_services"
)
// ServiceOperationStorage stores service to operation pairs.
type ServiceOperationStorage struct {
ctx context.Context
client es.Client
metrics *storageMetrics.WriteMetrics
logger *zap.Logger
serviceCache cache.Cache
}
// NewServiceOperationStorage returns a new ServiceOperationStorage.
func NewServiceOperationStorage(
ctx context.Context,
client es.Client,
metricsFactory metrics.Factory,
logger *zap.Logger,
cacheTTL time.Duration,
) *ServiceOperationStorage {
return &ServiceOperationStorage{
ctx: ctx,
client: client,
metrics: storageMetrics.NewWriteMetrics(metricsFactory, "ServiceOperation"),
logger: logger,
serviceCache: cache.NewLRUWithOptions(
100000,
&cache.Options{
TTL: cacheTTL,
},
),
}
}
// Write saves a service to operation pair.
func (s *ServiceOperationStorage) Write(indexName string, jsonSpan *jModel.Span) error {
// Insert serviceName:operationName document
service := Service{
ServiceName: jsonSpan.Process.ServiceName,
OperationName: jsonSpan.OperationName,
}
serviceID := fmt.Sprintf("%s|%s", service.ServiceName, service.OperationName)
cacheKey := fmt.Sprintf("%s:%s", indexName, serviceID)
if !keyInCache(cacheKey, s.serviceCache) {
start := time.Now()
_, err := s.client.Index().Index(indexName).Type(serviceType).Id(serviceID).BodyJson(service).Do(s.ctx)
s.metrics.Emit(err, time.Since(start))
if err != nil {
return s.logError(jsonSpan, err, "Failed to insert service:operation", s.logger)
}
writeCache(cacheKey, s.serviceCache)
}
return nil
}
func (s *ServiceOperationStorage) getServices(indices []string) ([]string, error) {
serviceAggregation := getServicesAggregation()
searchService := s.client.Search(indices...).
Type(serviceType).
Size(0). // set to 0 because we don't want actual documents.
IgnoreUnavailable(true).
Aggregation(servicesAggregation, serviceAggregation)
searchResult, err := searchService.Do(s.ctx)
if err != nil {
return nil, errors.Wrap(err, "Search service failed")
}
if searchResult.Aggregations == nil {
return []string{}, nil
}
bucket, found := searchResult.Aggregations.Terms(servicesAggregation)
if !found {
return nil, errors.New("Could not find aggregation of " + servicesAggregation)
}
serviceNamesBucket := bucket.Buckets
return bucketToStringArray(serviceNamesBucket)
}
func getServicesAggregation() elastic.Query {
return elastic.NewTermsAggregation().
Field(serviceName).
Size(defaultDocCount) // Must set to some large number. ES deprecated size omission for aggregating all. https://github.com/elastic/elasticsearch/issues/18838
}
func (s *ServiceOperationStorage) getOperations(indices []string, service string) ([]string, error) {
serviceQuery := elastic.NewTermQuery(serviceName, service)
serviceFilter := getOperationsAggregation()
searchService := s.client.Search(indices...).
Type(serviceType).
Size(0).
Query(serviceQuery).
IgnoreUnavailable(true).
Aggregation(operationsAggregation, serviceFilter)
searchResult, err := searchService.Do(s.ctx)
if err != nil {
return nil, errors.Wrap(err, "Search service failed")
}
if searchResult.Aggregations == nil {
return []string{}, nil
}
bucket, found := searchResult.Aggregations.Terms(operationsAggregation)
if !found {
return nil, errors.New("Could not find aggregation of " + operationsAggregation)
}
operationNamesBucket := bucket.Buckets
return bucketToStringArray(operationNamesBucket)
}
func getOperationsAggregation() elastic.Query {
return elastic.NewTermsAggregation().
Field(operationNameField).
Size(defaultDocCount) // Must set to some large number. ES deprecated size omission for aggregating all. https://github.com/elastic/elasticsearch/issues/18838
}
func (s *ServiceOperationStorage) logError(span *jModel.Span, err error, msg string, logger *zap.Logger) error {
logger.Debug("trace info:", zap.String("trace_id", string(span.TraceID)), zap.String("span_id", string(span.SpanID)))
logger.Error(msg, zap.Error(err))
return errors.Wrap(err, msg)
}