/
lightstep.go
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/
lightstep.go
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package lightstep
import (
"errors"
"fmt"
"net"
"strconv"
"strings"
"time"
log "github.com/sirupsen/logrus"
lightstep "github.com/lightstep/lightstep-tracer-go"
opentracing "github.com/opentracing/opentracing-go"
)
const (
defComponentName = "skipper"
defaultGRPMaxMsgSize = 16 * 1024 * 1000
)
func parseOptions(opts []string) (lightstep.Options, error) {
var (
port int
host, token string
cmdLine string
plaintext bool
logCmdLine bool
logEvents bool
maxBufferedSpans int
maxLogKeyLen int
maxLogValueLen int
maxLogsPerSpan int
grpcMaxMsgSize = defaultGRPMaxMsgSize
minReportingPeriod = lightstep.DefaultMinReportingPeriod
maxReportingPeriod = lightstep.DefaultMaxReportingPeriod
propagators = make(map[opentracing.BuiltinFormat]lightstep.Propagator)
useGRPC = true
)
componentName := defComponentName
globalTags := make(map[string]string)
defPropagator := lightstep.PropagatorStack{}
defPropagator.PushPropagator(lightstep.LightStepPropagator)
propagators[opentracing.HTTPHeaders] = defPropagator
for _, o := range opts {
parts := strings.SplitN(o, "=", 2)
switch parts[0] {
case "component-name":
if len(parts) > 1 {
componentName = parts[1]
}
case "token":
token = parts[1]
case "grpc-max-msg-size":
v, err := strconv.Atoi(parts[1])
if err != nil {
return lightstep.Options{}, fmt.Errorf("failed to parse %s as int grpc-max-msg-size: %v", parts[1], err)
}
grpcMaxMsgSize = v
case "min-period":
v, err := time.ParseDuration(parts[1])
if err != nil {
return lightstep.Options{}, fmt.Errorf("failed to parse %s as time.Duration min-period : %v", parts[1], err)
}
minReportingPeriod = v
case "max-period":
v, err := time.ParseDuration(parts[1])
if err != nil {
return lightstep.Options{}, fmt.Errorf("failed to parse %s as time.Duration max-period: %v", parts[1], err)
}
maxReportingPeriod = v
case "tag":
if len(parts) > 1 {
tags := strings.SplitN(parts[1], "=", 2)
if len(tags) != 2 {
return lightstep.Options{}, fmt.Errorf("missing value for tag %s", tags[0])
}
globalTags[tags[0]] = tags[1]
}
case "collector":
var err error
var sport string
host, sport, err = net.SplitHostPort(parts[1])
if err != nil {
return lightstep.Options{}, err
}
port, err = strconv.Atoi(sport)
if err != nil {
return lightstep.Options{}, fmt.Errorf("failed to parse %s as int: %v", sport, err)
}
case "plaintext":
var err error
plaintext, err = strconv.ParseBool(parts[1])
if err != nil {
return lightstep.Options{}, fmt.Errorf("failed to parse %s as bool: %v", parts[1], err)
}
case "cmd-line":
cmdLine = parts[1]
logCmdLine = true
case "protocol":
switch parts[1] {
case "http":
useGRPC = false
case "grpc":
useGRPC = true
default:
return lightstep.Options{}, fmt.Errorf("failed to parse protocol allowed 'http' or 'grpc', got: %s", parts[1])
}
case "log-events":
logEvents = true
case "max-buffered-spans":
var err error
if maxBufferedSpans, err = strconv.Atoi(parts[1]); err != nil {
return lightstep.Options{}, fmt.Errorf("failed to parse max buffered spans: %v", err)
}
case "max-log-key-len":
var err error
if maxLogKeyLen, err = strconv.Atoi(parts[1]); err != nil {
return lightstep.Options{}, fmt.Errorf("failed to parse max log key length: %v", err)
}
case "max-log-value-len":
var err error
if maxLogValueLen, err = strconv.Atoi(parts[1]); err != nil {
return lightstep.Options{}, fmt.Errorf("failed to parse max log value length: %v", err)
}
case "max-logs-per-span":
var err error
if maxLogsPerSpan, err = strconv.Atoi(parts[1]); err != nil {
return lightstep.Options{}, fmt.Errorf("failed to parse max logs per span: %v", err)
}
case "propagators":
if len(parts) > 1 {
prStack := lightstep.PropagatorStack{}
prs := strings.SplitN(parts[1], ",", 2)
for _, pr := range prs {
switch pr {
case "lightstep", "ls":
prStack.PushPropagator(lightstep.LightStepPropagator)
case "b3":
prStack.PushPropagator(lightstep.B3Propagator)
default:
return lightstep.Options{}, fmt.Errorf("unknown propagator `%v`", pr)
}
}
propagators[opentracing.HTTPHeaders] = prStack
}
}
}
// Token is required.
if token == "" {
return lightstep.Options{}, errors.New("missing token= option")
}
// Set defaults.
if host == "" {
host = lightstep.DefaultGRPCCollectorHost
port = lightstep.DefaultSecurePort
}
tags := map[string]interface{}{
lightstep.ComponentNameKey: componentName,
}
for k, v := range globalTags {
tags[k] = v
}
if logCmdLine {
tags[lightstep.CommandLineKey] = cmdLine
}
if logEvents {
lightstep.SetGlobalEventHandler(createEventLogger())
}
if minReportingPeriod > maxReportingPeriod {
return lightstep.Options{}, fmt.Errorf("wrong periods settings %s > %s", minReportingPeriod, maxReportingPeriod)
}
return lightstep.Options{
AccessToken: token,
Collector: lightstep.Endpoint{
Host: host,
Port: port,
Plaintext: plaintext,
},
UseGRPC: useGRPC,
Tags: tags,
MaxBufferedSpans: maxBufferedSpans,
MaxLogKeyLen: maxLogKeyLen,
MaxLogValueLen: maxLogValueLen,
MaxLogsPerSpan: maxLogsPerSpan,
GRPCMaxCallSendMsgSizeBytes: grpcMaxMsgSize,
ReportingPeriod: maxReportingPeriod,
MinReportingPeriod: minReportingPeriod,
Propagators: propagators,
}, nil
}
func InitTracer(opts []string) (opentracing.Tracer, error) {
lopt, err := parseOptions(opts)
if err != nil {
return nil, err
}
return lightstep.NewTracer(lopt), nil
}
func createEventLogger() lightstep.EventHandler {
return func(event lightstep.Event) {
if e, ok := event.(lightstep.ErrorEvent); ok {
log.WithError(e).Warn("LightStep tracer received an error event")
} else if e, ok := event.(lightstep.EventStatusReport); ok {
log.WithFields(log.Fields{
"duration": e.Duration(),
"sent_spans": e.SentSpans(),
"dropped_spans": e.DroppedSpans(),
}).Debugf("Sent a report to the collectors")
} else if _, ok := event.(lightstep.EventTracerDisabled); ok {
log.Warn("LightStep tracer has been disabled")
}
}
}