tracing_middleware

Documentation

Overview

Package tracing_middleware

tracing is a "parent" package for gRPC logging middlewares.

This middleware relies on OpenTracing as our tracing interface.

OpenTracing Interceptors

These are both client-side and server-side interceptors for OpenTracing. They are a provider-agnostic, with backends such as Zipkin, or Google Stackdriver Trace.

For a service that sends out requests and receives requests, you *need* to use both, otherwise downstream requests will not have the appropriate requests propagated.

All server-side spans are tagged with grpc_ctxtags information.

For more information see: http://opentracing.io/documentation/ https://github.com/opentracing/specification/blob/master/semantic_conventions.md

Index

• func ClientAddContextTags(ctx context.Context, tags opentracing.Tags) context.Context
• func StreamClientInterceptor(opts ...Option) grpc.StreamClientInterceptor
• func StreamServerInterceptor(opts ...Option) grpc.StreamServerInterceptor
• func UnaryClientInterceptor(opts ...Option) grpc.UnaryClientInterceptor
• func UnaryServerInterceptor(opts ...Option) grpc.UnaryServerInterceptor
• type FilterFunc
• type Option
  • func WithFilterFunc(f FilterFunc) Option
  • func WithTraceHeaderName(name string) Option
  • func WithTracer(tracer opentracing.Tracer) Option

Functions

func ClientAddContextTags

func ClientAddContextTags(ctx context.Context, tags opentracing.Tags) context.Context

ClientAddContextTags returns a context with specified opentracing tags, which are used by UnaryClientInterceptor/StreamClientInterceptor when creating a new span.

func StreamClientInterceptor

func StreamClientInterceptor(opts ...Option) grpc.StreamClientInterceptor

StreamClientInterceptor returns a new streaming client interceptor for OpenTracing.

func StreamServerInterceptor

func StreamServerInterceptor(opts ...Option) grpc.StreamServerInterceptor

StreamServerInterceptor returns a new streaming server interceptor for OpenTracing.

func UnaryClientInterceptor

func UnaryClientInterceptor(opts ...Option) grpc.UnaryClientInterceptor

UnaryClientInterceptor returns a new unary client interceptor for OpenTracing.

func UnaryServerInterceptor

func UnaryServerInterceptor(opts ...Option) grpc.UnaryServerInterceptor

UnaryServerInterceptor returns a new unary server interceptor for OpenTracing.

Types

type FilterFunc

type FilterFunc func(ctx context.Context, fullMethodName string) bool

FilterFunc allows users to provide a function that filters out certain methods from being traced.

If it returns false, the given request will not be traced.

type Option

type Option func(*options)

func WithFilterFunc

func WithFilterFunc(f FilterFunc) Option

WithFilterFunc customizes the function used for deciding whether a given call is traced or not.

func WithTraceHeaderName

func WithTraceHeaderName(name string) Option

WithTraceHeaderName customizes the trace header name where trace metadata passed with requests. Default one is `uber-trace-id`.

func WithTracer

func WithTracer(tracer opentracing.Tracer) Option

WithTracer sets a custom tracer to be used for this middleware, otherwise the opentracing.GlobalTracer is used.