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plugin.go
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plugin.go
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package otel
import (
"context"
"net"
"net/http"
"os"
"runtime"
"time"
"github.com/roadrunner-server/api/v2/plugins/config"
"github.com/roadrunner-server/errors"
jprop "go.opentelemetry.io/contrib/propagators/jaeger"
"go.opentelemetry.io/otel"
"go.opentelemetry.io/otel/exporters/jaeger"
"go.opentelemetry.io/otel/exporters/otlp/otlptrace"
"go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc"
"go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracehttp"
"go.opentelemetry.io/otel/exporters/stdout/stdouttrace"
"go.opentelemetry.io/otel/exporters/zipkin"
"go.opentelemetry.io/otel/propagation"
"go.opentelemetry.io/otel/sdk/resource"
sdktrace "go.opentelemetry.io/otel/sdk/trace"
semconv "go.opentelemetry.io/otel/semconv/v1.10.0"
"go.uber.org/zap"
// gzip grpc compressor
_ "google.golang.org/grpc/encoding/gzip"
)
const (
name string = "otel"
configurationKey string = "http.otel"
)
type Plugin struct {
cfg *Config
log *zap.Logger
tracer *sdktrace.TracerProvider
propagators propagation.TextMapPropagator
mdw mdw
}
func (p *Plugin) Init(cfg config.Configurer, log *zap.Logger) error { //nolint:gocyclo
const op = errors.Op("otel_plugin_init")
// name -> http.otel
if !cfg.Has(configurationKey) {
return errors.E(errors.Disabled)
}
err := cfg.UnmarshalKey(configurationKey, &p.cfg)
if err != nil {
return errors.E(op, err)
}
// init logger
p.log = &zap.Logger{}
*p.log = *log
// init default configuration
p.cfg.InitDefault()
var exporter sdktrace.SpanExporter
var client otlptrace.Client
switch p.cfg.Exporter {
case stdout:
exporter, err = stdouttrace.New(stdouttrace.WithPrettyPrint(), stdouttrace.WithWriter(os.Stdout))
if err != nil {
return err
}
case zipkinExp:
exporter, err = zipkin.New(p.cfg.Endpoint)
if err != nil {
return err
}
case jaegerExp:
exporter, err = jaeger.New(jaeger.WithCollectorEndpoint(jaeger.WithEndpoint(p.cfg.Endpoint)))
if err != nil {
return err
}
case jaegerAgent:
host, port, errHp := net.SplitHostPort(p.cfg.Endpoint)
if errHp != nil {
return errHp
}
exporter, err = jaeger.New(jaeger.WithAgentEndpoint(jaeger.WithAgentHost(host), jaeger.WithAgentPort(port)))
if err != nil {
return err
}
case otlp:
switch p.cfg.Client {
case httpClient:
client = otlptracehttp.NewClient(httpOptions(p.cfg)...)
case grpcClient:
client = otlptracegrpc.NewClient(grpcOptions(p.cfg)...)
default:
return errors.Errorf("unknown client: %s", p.cfg.Client)
}
// 1 min timeout
ctx, cancel := context.WithTimeout(context.Background(), time.Minute)
defer cancel()
exporter, err = otlptrace.New(ctx, client)
if err != nil {
return errors.E(op, err)
}
default:
return errors.Errorf("unknown exporter: %s", p.cfg.Exporter)
}
p.tracer = sdktrace.NewTracerProvider(
sdktrace.WithSampler(sdktrace.AlwaysSample()),
sdktrace.WithBatcher(exporter),
sdktrace.WithResource(newResource(p.cfg.ServiceName, p.cfg.ServiceVersion, cfg.RRVersion())),
)
p.propagators = propagation.NewCompositeTextMapPropagator(propagation.TraceContext{}, propagation.Baggage{}, jprop.Jaeger{})
p.mdw = wrapper(p.propagators, p.tracer, p.cfg.ServiceName)
otel.SetTracerProvider(p.tracer)
return nil
}
func (p *Plugin) Middleware(next http.Handler) http.Handler {
return Handler(next, p.mdw)
}
func (p *Plugin) Serve() chan error {
return make(chan error, 1)
}
func (p *Plugin) Stop() error {
// https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/trace/sdk.md#forceflush
ctx, cancel := context.WithTimeout(context.Background(), time.Second*30)
defer cancel()
err := p.tracer.ForceFlush(ctx)
if err != nil {
return err
}
// https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/trace/sdk.md#shutdown
ctx2, cancel := context.WithTimeout(context.Background(), time.Second*30)
defer cancel()
err = p.tracer.Shutdown(ctx2)
if err != nil {
return err
}
return nil
}
func (p *Plugin) Name() string {
return name
}
func newResource(serviceName, serviceVersion, rrVersion string) *resource.Resource {
return resource.NewWithAttributes(
semconv.SchemaURL,
semconv.OSNameKey.String(runtime.GOOS),
semconv.ServiceNameKey.String(serviceName),
semconv.ServiceVersionKey.String(serviceVersion),
semconv.WebEngineNameKey.String("RoadRunner"),
semconv.WebEngineVersionKey.String(rrVersion),
semconv.HostArchKey.String(runtime.GOARCH),
semconv.TelemetrySDKNameKey.String("opentelemetry"),
semconv.TelemetrySDKLanguageKey.String("go"),
semconv.TelemetrySDKVersionKey.String(otel.Version()),
)
}
func grpcOptions(cfg *Config) []otlptracegrpc.Option {
options := make([]otlptracegrpc.Option, 0, 5)
if cfg.Insecure {
options = append(options, otlptracegrpc.WithInsecure())
}
if cfg.Compress {
options = append(options, otlptracegrpc.WithCompressor("gzip"))
}
options = append(options, otlptracegrpc.WithEndpoint(cfg.Endpoint))
options = append(options, otlptracegrpc.WithHeaders(cfg.Headers))
return options
}
func httpOptions(cfg *Config) []otlptracehttp.Option {
options := make([]otlptracehttp.Option, 0, 5)
if cfg.Insecure {
options = append(options, otlptracehttp.WithInsecure())
}
if cfg.Compress {
options = append(options, otlptracehttp.WithCompression(otlptracehttp.GzipCompression))
}
if cfg.CustomURL != "" {
options = append(options, otlptracehttp.WithURLPath(cfg.CustomURL))
}
options = append(options, otlptracehttp.WithEndpoint(cfg.Endpoint))
options = append(options, otlptracehttp.WithHeaders(cfg.Headers))
return options
}