Zipkin Library for Go
Zipkin Go is the official Go Tracer / Tracing implementation for Zipkin, supported by the OpenZipkin community.
package organization
zipkin-go is built with interoperability in mind within the OpenZipkin
community and even 3rd parties, the library consists of several packages.
The main tracing implementation can be found in the root folder of this repository. Reusable parts not considered core implementation or deemed beneficiary for usage by others are placed in their own packages within this repository.
model
This library implements the Zipkin V2 Span Model which is available in the model package. It contains a Go data model compatible with the Zipkin V2 API and can automatically sanitize, parse and (de)serialize to and from the required JSON representation as used by the official Zipkin V2 Collectors.
propagation
The propagation package and B3 subpackage hold the logic for propagating SpanContext (span identifiers and sampling flags) between services participating in traces. Currently Zipkin B3 Propagation is supported for HTTP and GRPC.
middleware
The middleware subpackages contain officially supported middleware handlers and tracing wrappers.
http
An easy to use http.Handler middleware for tracing server side requests is provided. This allows one to use this middleware in applications using standard library servers as well as most available higher level frameworks. Some frameworks will have their own instrumentation and middleware that maps better for their ecosystem.
For HTTP client operations NewTransport can return a http.RoundTripper
implementation that can either wrap the standard http.Client's Transport or a
custom provided one and add per request tracing. Since HTTP Requests can have
one or multiple redirects it is advisable to always enclose HTTP Client calls
with a Span either around the *http.Client call level or parent function
level.
For convenience NewClient is provided which returns a HTTP Client which embeds
*http.Client and provides an application span around the HTTP calls when
calling the DoWithAppSpan() method.
grpc
Easy to use grpc.StatsHandler middleware are provided for tracing gRPC server and client requests.
For a server, pass NewServerHandler when calling NewServer, e.g.,
import (
"google.golang.org/grpc"
zipkingrpc "github.com/openzipkin/zipkin-go/middleware/grpc"
)
server = grpc.NewServer(grpc.StatsHandler(zipkingrpc.NewServerHandler(tracer)))For a client, pass NewClientHandler when calling Dial, e.g.,
import (
"google.golang.org/grpc"
zipkingrpc "github.com/openzipkin/zipkin-go/middleware/grpc"
)
conn, err = grpc.Dial(addr, grpc.WithStatsHandler(zipkingrpc.NewClientHandler(tracer)))reporter
The reporter package holds the interface which the various Reporter
implementations use. It is exported into its own package as it can be used by
3rd parties to use these Reporter packages in their own libraries for exporting
to the Zipkin ecosystem. The zipkin-go tracer also uses the interface to
accept 3rd party Reporter implementations.
HTTP Reporter
Most common Reporter type used by Zipkin users transporting Spans to the Zipkin server using JSON over HTTP. The reporter holds a buffer and reports to the backend asynchronously.
Kafka Reporter
High performance Reporter transporting Spans to the Zipkin server using a Kafka Producer digesting JSON V2 Spans. The reporter uses the Sarama async producer underneath.