/
trace.go
86 lines (74 loc) · 2.5 KB
/
trace.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
// Copyright 2018 Istio 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 trace contains a tracespan adapter for Stackdriver trace.
package trace
import (
"context"
"go.opencensus.io/trace"
"istio.io/istio/mixer/adapter/stackdriver/config"
"istio.io/istio/mixer/adapter/stackdriver/helper"
"istio.io/istio/mixer/pkg/adapter"
"istio.io/istio/mixer/pkg/adapter/opencensus"
"istio.io/istio/mixer/template/tracespan"
)
type builder struct {
types map[string]*tracespan.Type
mg helper.MetadataGenerator
cfg *config.Params
}
var (
// compile-time assertion that we implement the interfaces we promise
_ tracespan.HandlerBuilder = &builder{}
)
// NewBuilder returns a builder implementing the tracespan.HandlerBuilder interface.
func NewBuilder(mg helper.MetadataGenerator) tracespan.HandlerBuilder {
return &builder{mg: mg}
}
func (b *builder) SetTraceSpanTypes(types map[string]*tracespan.Type) {
b.types = types
}
func (b *builder) SetAdapterConfig(cfg adapter.Config) {
b.cfg = cfg.(*config.Params)
}
func (b *builder) Validate() (ce *adapter.ConfigErrors) {
if t := b.cfg.Trace; t != nil {
if t.SampleProbability < 0 || t.SampleProbability > 1 {
ce = ce.Appendf("trace.sampleProbability", "sampling probability must be between 0 and 1 (inclusive)")
}
}
return ce
}
func (b *builder) Build(ctx context.Context, env adapter.Env) (adapter.Handler, error) {
cfg := b.cfg
md := b.mg.GenerateMetadata()
if cfg.ProjectId == "" {
// Try to fill project ID if it is not provided with metadata.
cfg.ProjectId = md.ProjectID
}
exporter, err := getExporterFunc(ctx, env, cfg)
if err != nil {
return nil, err
}
traceCfg := b.cfg.Trace
var sampler trace.Sampler
if traceCfg != nil {
if sampleProbability := traceCfg.SampleProbability; sampleProbability > 0 {
sampler = trace.ProbabilitySampler(traceCfg.SampleProbability)
}
}
newExporter := func(name string, endpoint string) trace.Exporter {
return exporter
}
return opencensus.NewTraceHandler(newExporter, sampler), nil
}