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storage.go
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storage.go
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// Copyright (c) 2018 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 dependencystore
import (
"context"
"time"
"github.com/jaegertracing/jaeger/model"
"github.com/jaegertracing/jaeger/storage/spanstore"
)
// DependencyStore handles all queries and insertions to Cassandra dependencies
type DependencyStore struct {
reader spanstore.Reader
}
// NewDependencyStore returns a DependencyStore
func NewDependencyStore(store spanstore.Reader) *DependencyStore {
return &DependencyStore{
reader: store,
}
}
// GetDependencies returns all interservice dependencies, implements DependencyReader
func (s *DependencyStore) GetDependencies(endTs time.Time, lookback time.Duration) ([]model.DependencyLink, error) {
deps := map[string]*model.DependencyLink{}
params := &spanstore.TraceQueryParameters{
StartTimeMin: endTs.Add(-1 * lookback),
StartTimeMax: endTs,
}
// We need to do a full table scan - if this becomes a bottleneck, we can write write an index that describes
// dependencyKeyPrefix + timestamp + parent + child key and do a key-only seek (which is fast - but requires additional writes)
// GetDependencies is not shipped with a context like the SpanReader / SpanWriter
traces, err := s.reader.FindTraces(context.Background(), params)
if err != nil {
return nil, err
}
for _, tr := range traces {
processTrace(deps, tr)
}
return depMapToSlice(deps), err
}
// depMapToSlice modifies the spans to DependencyLink in the same way as the memory storage plugin
func depMapToSlice(deps map[string]*model.DependencyLink) []model.DependencyLink {
retMe := make([]model.DependencyLink, 0, len(deps))
for _, dep := range deps {
retMe = append(retMe, *dep)
}
return retMe
}
// processTrace is copy from the memory storage plugin
func processTrace(deps map[string]*model.DependencyLink, trace *model.Trace) {
for _, s := range trace.Spans {
parentSpan := seekToSpan(trace, s.ParentSpanID())
if parentSpan != nil {
if parentSpan.Process.ServiceName == s.Process.ServiceName {
continue
}
depKey := parentSpan.Process.ServiceName + "&&&" + s.Process.ServiceName
if _, ok := deps[depKey]; !ok {
deps[depKey] = &model.DependencyLink{
Parent: parentSpan.Process.ServiceName,
Child: s.Process.ServiceName,
CallCount: 1,
}
} else {
deps[depKey].CallCount++
}
}
}
}
func seekToSpan(trace *model.Trace, spanID model.SpanID) *model.Span {
for _, s := range trace.Spans {
if s.SpanID == spanID {
return s
}
}
return nil
}