/
streaming_writer.go
99 lines (88 loc) · 2.69 KB
/
streaming_writer.go
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// Copyright (c) 2022 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 shared
import (
"context"
"errors"
"fmt"
"sync/atomic"
"github.com/jaegertracing/jaeger/model"
"github.com/jaegertracing/jaeger/proto-gen/storage_v1"
"github.com/jaegertracing/jaeger/storage/spanstore"
)
var _ spanstore.Writer = (*streamingSpanWriter)(nil)
const (
defaultMaxPoolSize = 1000
)
// streamingSpanWriter wraps storage_v1.StreamingSpanWriterPluginClient into spanstore.Writer
type streamingSpanWriter struct {
client storage_v1.StreamingSpanWriterPluginClient
streamPool chan storage_v1.StreamingSpanWriterPlugin_WriteSpanStreamClient
closed atomic.Bool
}
func newStreamingSpanWriter(client storage_v1.StreamingSpanWriterPluginClient) *streamingSpanWriter {
s := &streamingSpanWriter{
client: client,
streamPool: make(chan storage_v1.StreamingSpanWriterPlugin_WriteSpanStreamClient, defaultMaxPoolSize),
}
return s
}
// WriteSpan write span into stream
func (s *streamingSpanWriter) WriteSpan(ctx context.Context, span *model.Span) error {
stream, err := s.getStream(ctx)
if err != nil {
return fmt.Errorf("plugin getStream error: %w", err)
}
if err := stream.Send(&storage_v1.WriteSpanRequest{Span: span}); err != nil {
return fmt.Errorf("plugin Send error: %w", err)
}
s.putStream(stream)
return nil
}
func (s *streamingSpanWriter) Close() error {
if !s.closed.CompareAndSwap(false, true) {
return errors.New("already closed")
}
close(s.streamPool)
for stream := range s.streamPool {
if _, err := stream.CloseAndRecv(); err != nil {
return err
}
}
return nil
}
func (s *streamingSpanWriter) getStream(ctx context.Context) (storage_v1.StreamingSpanWriterPlugin_WriteSpanStreamClient, error) {
select {
case st, ok := <-s.streamPool:
if ok {
return st, nil
}
return nil, fmt.Errorf("plugin is closed")
default:
return s.client.WriteSpanStream(ctx)
}
}
func (s *streamingSpanWriter) putStream(stream storage_v1.StreamingSpanWriterPlugin_WriteSpanStreamClient) error {
if s.closed.Load() {
_, err := stream.CloseAndRecv()
return err
}
select {
case s.streamPool <- stream:
return nil
default:
_, err := stream.CloseAndRecv()
return err
}
}