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trace.go
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trace.go
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//
// Copyright (C) 2019-2020 Vdaas.org Vald team ( kpango, rinx, kmrmt )
//
// 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
//
// https://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 trace provides trace functions.
package trace
import (
"context"
"go.opencensus.io/trace"
)
var (
enabled bool
BoolAttribute = trace.BoolAttribute
Float64Attribute = trace.Float64Attribute
Int64Attribute = trace.Int64Attribute
StringAttribute = trace.StringAttribute
FromContext = trace.FromContext
)
type Span = trace.Span
type Tracer interface {
Start(ctx context.Context)
}
type tracer struct {
samplingRate float64
}
func StartSpan(ctx context.Context, name string, opts ...trace.StartOption) (context.Context, *Span) {
if !enabled {
return ctx, nil
}
return trace.StartSpan(ctx, name, opts...)
}
func New(opts ...TraceOption) Tracer {
t := new(tracer)
for _, opt := range append(traceDefaultOpts, opts...) {
opt(t)
}
enabled = true
return t
}
func (t *tracer) Start(ctx context.Context) {
trace.ApplyConfig(
trace.Config{
DefaultSampler: trace.ProbabilitySampler(t.samplingRate),
},
)
}