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eventstore.go
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eventstore.go
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// Copyright (c) 2020 - The Event Horizon 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 tracing
import (
"context"
"github.com/opentracing/opentracing-go"
"github.com/opentracing/opentracing-go/ext"
eh "github.com/looplab/eventhorizon"
"github.com/looplab/eventhorizon/uuid"
)
// EventStore is an eventhorizon.EventStore that adds tracing with Open Tracing.
type EventStore struct {
eh.EventStore
}
// NewEventStore creates a new EventStore.
func NewEventStore(eventStore eh.EventStore) *EventStore {
if eventStore == nil {
return nil
}
return &EventStore{
EventStore: eventStore,
}
}
// Save implements the Save method of the eventhorizon.EventStore interface.
func (s *EventStore) Save(ctx context.Context, events []eh.Event, originalVersion int) error {
sp, ctx := opentracing.StartSpanFromContext(ctx, "EventStore.Save")
err := s.EventStore.Save(ctx, events, originalVersion)
// Use the first event for tracing metadata.
if len(events) > 0 {
sp.SetTag("eh.event_type", events[0].EventType())
sp.SetTag("eh.aggregate_type", events[0].AggregateType())
sp.SetTag("eh.aggregate_id", events[0].AggregateID())
sp.SetTag("eh.version", events[0].Version())
}
if err != nil {
ext.LogError(sp, err)
}
sp.Finish()
return err
}
// Load implements the Load method of the eventhorizon.EventStore interface.
func (s *EventStore) Load(ctx context.Context, id uuid.UUID) ([]eh.Event, error) {
sp, ctx := opentracing.StartSpanFromContext(ctx, "EventStore.Load")
events, err := s.EventStore.Load(ctx, id)
// Use the first event for tracing metadata.
if len(events) > 0 {
sp.SetTag("eh.event_type", events[0].EventType())
sp.SetTag("eh.aggregate_type", events[0].AggregateType())
sp.SetTag("eh.aggregate_id", events[0].AggregateID())
sp.SetTag("eh.version", events[0].Version())
}
if err != nil {
ext.LogError(sp, err)
}
sp.Finish()
return events, err
}