jaeger.go

// Copyright 2018, OpenCensus 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 exporterparser

import (
	"context"

	"github.com/census-instrumentation/opencensus-service/data"
	"github.com/census-instrumentation/opencensus-service/exporter"
	"go.opencensus.io/exporter/jaeger"
)

// Slight modified version of go/src/go.opencensus.io/exporter/jaeger/jaeger.go
type jaegerConfig struct {
	CollectorEndpoint string `yaml:"collector_endpoint,omitempty"`
	Username          string `yaml:"username,omitempty"`
	Password          string `yaml:"password,omitempty"`
	ServiceName       string `yaml:"service_name,omitempty"`
}

type jaegerExporter struct {
	exporter *jaeger.Exporter
}

// JaegerExportersFromYAML parses the yaml bytes and returns exporter.TraceExporters targeting
// Jaeger according to the configuration settings.
func JaegerExportersFromYAML(config []byte) (tes []exporter.TraceExporter, mes []exporter.MetricsExporter, doneFns []func() error, err error) {
	var cfg struct {
		Exporters *struct {
			Jaeger *jaegerConfig `yaml:"jaeger"`
		} `yaml:"exporters"`
	}
	if err := yamlUnmarshal(config, &cfg); err != nil {
		return nil, nil, nil, err
	}
	if cfg.Exporters == nil {
		return nil, nil, nil, nil
	}
	jc := cfg.Exporters.Jaeger
	if jc == nil {
		return nil, nil, nil, nil
	}

	// jaeger.NewExporter performs configurqtion validation
	je, err := jaeger.NewExporter(jaeger.Options{
		CollectorEndpoint: jc.CollectorEndpoint,
		Username:          jc.Username,
		Password:          jc.Password,
		Process: jaeger.Process{
			ServiceName: jc.ServiceName,
		},
	})
	if err != nil {
		return nil, nil, nil, err
	}

	doneFns = append(doneFns, func() error {
		je.Flush()
		return nil
	})
	tes = append(tes, &jaegerExporter{exporter: je})
	return
}

func (je *jaegerExporter) ExportSpans(ctx context.Context, td data.TraceData) error {
	// TODO: Examine "contrib.go.opencensus.io/exporter/jaeger" to see
	// if trace.ExportSpan was constraining and if perhaps the Jaeger
	// upload can use the context and information from the Node.
	return exportSpans(ctx, "jaeger", je.exporter, td)
}