133 lines
3.9 KiB
Go
133 lines
3.9 KiB
Go
package middleware
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import (
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"context"
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"github.com/containous/alice"
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"github.com/traefik/traefik/v2/pkg/config/static"
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"github.com/traefik/traefik/v2/pkg/log"
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"github.com/traefik/traefik/v2/pkg/metrics"
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"github.com/traefik/traefik/v2/pkg/middlewares/accesslog"
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metricsmiddleware "github.com/traefik/traefik/v2/pkg/middlewares/metrics"
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"github.com/traefik/traefik/v2/pkg/middlewares/requestdecorator"
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mTracing "github.com/traefik/traefik/v2/pkg/middlewares/tracing"
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"github.com/traefik/traefik/v2/pkg/tracing"
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"github.com/traefik/traefik/v2/pkg/tracing/jaeger"
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)
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// ChainBuilder Creates a middleware chain by entry point. It is used for middlewares that are created almost systematically and that need to be created before all others.
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type ChainBuilder struct {
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metricsRegistry metrics.Registry
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accessLoggerMiddleware *accesslog.Handler
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tracer *tracing.Tracing
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requestDecorator *requestdecorator.RequestDecorator
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}
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// NewChainBuilder Creates a new ChainBuilder.
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func NewChainBuilder(staticConfiguration static.Configuration, metricsRegistry metrics.Registry, accessLoggerMiddleware *accesslog.Handler) *ChainBuilder {
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return &ChainBuilder{
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metricsRegistry: metricsRegistry,
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accessLoggerMiddleware: accessLoggerMiddleware,
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tracer: setupTracing(staticConfiguration.Tracing),
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requestDecorator: requestdecorator.New(staticConfiguration.HostResolver),
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}
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}
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// Build a middleware chain by entry point.
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func (c *ChainBuilder) Build(ctx context.Context, entryPointName string) alice.Chain {
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chain := alice.New()
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if c.accessLoggerMiddleware != nil {
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chain = chain.Append(accesslog.WrapHandler(c.accessLoggerMiddleware))
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}
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if c.tracer != nil {
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chain = chain.Append(mTracing.WrapEntryPointHandler(ctx, c.tracer, entryPointName))
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}
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if c.metricsRegistry != nil && c.metricsRegistry.IsEpEnabled() {
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chain = chain.Append(metricsmiddleware.WrapEntryPointHandler(ctx, c.metricsRegistry, entryPointName))
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}
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return chain.Append(requestdecorator.WrapHandler(c.requestDecorator))
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}
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// Close accessLogger and tracer.
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func (c *ChainBuilder) Close() {
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if c.accessLoggerMiddleware != nil {
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if err := c.accessLoggerMiddleware.Close(); err != nil {
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log.WithoutContext().Errorf("Could not close the access log file: %s", err)
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}
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}
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if c.tracer != nil {
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c.tracer.Close()
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}
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}
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func setupTracing(conf *static.Tracing) *tracing.Tracing {
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if conf == nil {
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return nil
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}
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var backend tracing.Backend
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if conf.Jaeger != nil {
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backend = conf.Jaeger
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}
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if conf.Zipkin != nil {
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if backend != nil {
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log.WithoutContext().Error("Multiple tracing backend are not supported: cannot create Zipkin backend.")
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} else {
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backend = conf.Zipkin
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}
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}
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if conf.Datadog != nil {
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if backend != nil {
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log.WithoutContext().Error("Multiple tracing backend are not supported: cannot create Datadog backend.")
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} else {
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backend = conf.Datadog
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}
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}
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if conf.Instana != nil {
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if backend != nil {
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log.WithoutContext().Error("Multiple tracing backend are not supported: cannot create Instana backend.")
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} else {
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backend = conf.Instana
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}
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}
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if conf.Haystack != nil {
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if backend != nil {
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log.WithoutContext().Error("Multiple tracing backend are not supported: cannot create Haystack backend.")
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} else {
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backend = conf.Haystack
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}
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}
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if conf.Elastic != nil {
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if backend != nil {
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log.WithoutContext().Error("Multiple tracing backend are not supported: cannot create Elastic backend.")
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} else {
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backend = conf.Elastic
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}
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}
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if backend == nil {
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log.WithoutContext().Debug("Could not initialize tracing, using Jaeger by default")
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defaultBackend := &jaeger.Config{}
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defaultBackend.SetDefaults()
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backend = defaultBackend
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}
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tracer, err := tracing.NewTracing(conf.ServiceName, conf.SpanNameLimit, backend)
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if err != nil {
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log.WithoutContext().Warnf("Unable to create tracer: %v", err)
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return nil
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}
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return tracer
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}
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