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jaeger.go
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jaeger.go
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package jaeger
import (
"errors"
"fmt"
"strconv"
"strings"
"time"
"github.com/opentracing/opentracing-go"
"github.com/uber/jaeger-client-go/config"
"github.com/uber/jaeger-lib/metrics/prometheus"
)
const (
defServiceName = "skipper"
)
func parseOptions(opts []string) (*config.Configuration, error) {
useRPCMetrics := false
serviceName := defServiceName
var err error
var samplerParam float64
var samplerType string
var samplerURL string
var localAgent string
var reporterQueue int
var reporterInterval time.Duration
var globalTags []opentracing.Tag
for _, o := range opts {
k, v, _ := strings.Cut(o, "=")
switch k {
case "service-name":
if v != "" {
serviceName = v
}
case "use-rpc-metrics":
useRPCMetrics = true
case "sampler-type":
if v == "" {
return nil, missingArg(k)
}
samplerType, v, _ = strings.Cut(v, ":")
switch samplerType {
case "const":
samplerParam = 1.0
case "probabilistic", "rateLimiting", "remote":
if v == "" {
return nil, missingArg(k)
}
samplerParam, err = strconv.ParseFloat(v, 64)
if err != nil {
return nil, invalidArg(v, err)
}
default:
return nil, invalidArg(k, errors.New("invalid sampler type"))
}
case "sampler-url":
if v == "" {
return nil, missingArg(k)
}
samplerURL = v
case "reporter-queue":
if v == "" {
return nil, missingArg(k)
}
reporterQueue, _ = strconv.Atoi(v)
case "reporter-interval":
if v == "" {
return nil, missingArg(k)
}
reporterInterval, err = time.ParseDuration(v)
if err != nil {
return nil, invalidArg(v, err)
}
case "local-agent":
if v == "" {
return nil, missingArg(k)
}
localAgent = v
case "tag":
if v != "" {
k, v, _ := strings.Cut(v, "=")
if v == "" {
return nil, fmt.Errorf("missing value for tag %s", k)
}
globalTags = append(globalTags, opentracing.Tag{Key: k, Value: v})
}
}
}
conf := &config.Configuration{
ServiceName: serviceName,
Disabled: false,
Sampler: &config.SamplerConfig{
Type: samplerType,
Param: samplerParam,
SamplingServerURL: samplerURL,
},
Reporter: &config.ReporterConfig{
QueueSize: reporterQueue,
BufferFlushInterval: reporterInterval,
LocalAgentHostPort: localAgent,
},
RPCMetrics: useRPCMetrics,
Tags: globalTags,
}
return conf, nil
}
func InitTracer(opts []string) (opentracing.Tracer, error) {
conf, err := parseOptions(opts)
if err != nil {
return nil, err
}
metricsFactory := prometheus.New()
tracer, _, err := conf.NewTracer(config.Metrics(metricsFactory))
return tracer, err
}
func missingArg(opt string) error {
return fmt.Errorf("missing argument for %s option", opt)
}
func invalidArg(opt string, err error) error {
return fmt.Errorf("invalid argument for %s option: %s", opt, err)
}