/
exporter.go
63 lines (52 loc) · 1.91 KB
/
exporter.go
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// 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
import (
"context"
"sync"
ocstackdriver "contrib.go.opencensus.io/exporter/stackdriver"
"go.opencensus.io/trace"
"istio.io/istio/mixer/adapter/stackdriver/config"
"istio.io/istio/mixer/adapter/stackdriver/helper"
"istio.io/istio/mixer/pkg/adapter"
)
// getExporterFunc allows indirect construction of exporters, for testing.
var getExporterFunc = getStackdriverExporter
var (
// The Stackdriver exporter only supports a single instance per project.
// See: https://github.com/census-ecosystem/opencensus-go-exporter-stackdriver/issues/8
projectsToExporters = make(map[string]*ocstackdriver.Exporter)
exportersMu sync.Mutex
)
func getStackdriverExporter(_ context.Context, env adapter.Env, params *config.Params) (trace.Exporter, error) {
opts := ocstackdriver.Options{
MonitoringClientOptions: helper.ToOpts(params), // not used, but causes errors if invalid
TraceClientOptions: helper.ToOpts(params),
ProjectID: params.ProjectId,
OnError: func(err error) {
_ = env.Logger().Errorf("Stackdriver trace: %s", err.Error())
},
}
exportersMu.Lock()
defer exportersMu.Unlock()
if e, ok := projectsToExporters[opts.ProjectID]; ok {
return e, nil
}
e, err := ocstackdriver.NewExporter(opts)
if err != nil {
return nil, err
}
projectsToExporters[opts.ProjectID] = e
return e, nil
}