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tracing.go
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tracing.go
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package messaging
import (
"log"
"os"
"strings"
"time"
"github.com/golang/protobuf/proto"
"github.com/golang/protobuf/ptypes/any"
opentracing "github.com/opentracing/opentracing-go"
"github.com/satori/go.uuid"
"github.com/uber/jaeger-client-go"
config "github.com/uber/jaeger-client-go/config"
events "github.com/veritone/core-messages/generated/go/events"
"go.uber.org/zap"
)
// JaegerAgentHostPort point to the agent deployed with sidecar pattern
// Deployment should use the default port
const JaegerAgentHostPort = "0.0.0.0:6831"
// var messagingTracer opentracing.Tracer
type Tracer struct {
opentracing.Tracer
serviceName string
logger Logger
}
func AddTracer(serviceName, env string) (*Tracer, error) {
if serviceName == "" {
if serviceName = os.Getenv("SERVICE_NAME"); serviceName == "" {
var err error
serviceName, err = os.Hostname()
if err != nil {
return nil, err
}
}
}
if env == "" {
env, _ = os.LookupEnv("LOGGER")
}
var sampler *config.SamplerConfig
switch strings.ToLower(env) {
case "prod":
sampler = &config.SamplerConfig{
Type: "probabilistic",
Param: 0.01, // 1% of traffic in production
}
default:
sampler = &config.SamplerConfig{
Type: "probabilistic",
Param: 1.0, // 100% of traffic in other envs
}
}
cfg := config.Configuration{
ServiceName: serviceName,
Sampler: sampler,
Reporter: &config.ReporterConfig{
LogSpans: false,
BufferFlushInterval: 1 * time.Second,
LocalAgentHostPort: JaegerAgentHostPort,
},
}
logger, err := AddLogger(env)
if err != nil {
return nil, err
}
tracer, _, err := cfg.NewTracer(config.Logger(jaeger.StdLogger))
return &Tracer{
Tracer: tracer,
serviceName: serviceName,
logger: logger,
}, err
}
func MustAddTracer(serviceName, env string) *Tracer {
tracer, err := AddTracer(serviceName, env)
if err != nil {
log.Panic(err)
}
return tracer
}
func (t *Tracer) Trace(to *events.VtEvent, from *events.VtEvent) {
var (
optName string
startTime time.Time
err error
fromSpanContext opentracing.SpanContext
)
optName = to.Core.Name
if from != nil {
carrier := opentracing.TextMapCarrier(from.Trace.TraceContext)
fromSpanContext, err = t.Extract(opentracing.TextMap, carrier)
if err != nil {
if err != opentracing.ErrSpanContextNotFound {
t.logger.Warn("error extracting SpanContext",
zap.String("id", from.Core.GetId()),
zap.String("event", from.Core.GetName()),
zap.String("err", err.Error()))
}
}
startTime, err = time.Parse(time.RFC1123, from.Core.Timestamp)
} else {
startTime, err = time.Parse(time.RFC1123, to.Core.Timestamp)
}
if err != nil {
startTime = time.Now()
}
traceStartTime := opentracing.StartTime(startTime)
spanReference := opentracing.FollowsFrom(fromSpanContext)
currSpan := t.StartSpan(optName, traceStartTime, spanReference)
defer currSpan.Finish()
traceCarrier := opentracing.TextMapCarrier(to.Trace.TraceContext)
err = t.Inject(currSpan.Context(), opentracing.TextMap, traceCarrier)
if err != nil {
t.logger.Warn("error injecting SpanContext to new message",
zap.String("id", to.Core.GetId()),
zap.String("event", to.Core.GetName()),
zap.String("err", err.Error()))
}
}
func (t *Tracer) Decorate(msgType interface{}, msgPayload []byte) *events.VtEvent {
protoMsg, ok := msgType.(proto.Message)
if ok {
if vtEventProtoMsg, ok := protoMsg.(*events.VtEvent); ok {
t.logger.Debug("message is already an events.VtEvent type")
return vtEventProtoMsg
}
eventName := proto.MessageName(protoMsg)
t.logger.Debug("eventName:", zap.String("eventName", eventName))
return &events.VtEvent{
Core: &events.Core{
Id: uuid.Must(uuid.NewV4()).String(),
Name: eventName,
Timestamp: time.Now().Format(time.RFC1123),
},
Trace: &events.Trace{
TraceContext: make(map[string]string),
ServiceName: t.serviceName,
TraceTags: make(map[string]string),
},
Data: &any.Any{
TypeUrl: "veritone.com/" + eventName,
Value: msgPayload,
},
}
}
return nil
}