github.com/dolthub/go-mysql-server@v0.18.0/test/mem_tracer.go (about)

     1  // Copyright 2020-2021 Dolthub, Inc.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package test
    16  
    17  import (
    18  	"context"
    19  	"sync"
    20  
    21  	"go.opentelemetry.io/otel/trace"
    22  )
    23  
    24  var _, noopSpan = trace.NewNoopTracerProvider().Tracer("").Start(context.Background(), "")
    25  
    26  // MemTracer implements a simple tracer in memory for testing.
    27  type MemTracer struct {
    28  	Spans []string
    29  	sync.Mutex
    30  }
    31  
    32  type memSpan struct {
    33  	opName string
    34  }
    35  
    36  func (t *MemTracer) Start(ctx context.Context, operationName string, opts ...trace.SpanStartOption) (context.Context, trace.Span) {
    37  	t.Lock()
    38  	t.Spans = append(t.Spans, operationName)
    39  	t.Unlock()
    40  	return ctx, noopSpan
    41  }