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# OpenTracing support for gRPC in Go
The `otgrpc` package makes it easy to add OpenTracing support to gRPC-based
systems in Go.
## Installation
```
go get github.com/grpc-ecosystem/grpc-opentracing/go/otgrpc
```
## Documentation
See the basic usage examples below and the [package documentation on
godoc.org](https://godoc.org/github.com/grpc-ecosystem/grpc-opentracing/go/otgrpc).
## Client-side usage example
Wherever you call `grpc.Dial`:
```go
// You must have some sort of OpenTracing Tracer instance on hand.
var tracer opentracing.Tracer = ...
...
// Set up a connection to the server peer.
conn, err := grpc.Dial(
address,
... // other options
grpc.WithUnaryInterceptor(
otgrpc.OpenTracingClientInterceptor(tracer)),
grpc.WithStreamInterceptor(
otgrpc.OpenTracingStreamClientInterceptor(tracer)))
// All future RPC activity involving `conn` will be automatically traced.
```
## Server-side usage example
Wherever you call `grpc.NewServer`:
```go
// You must have some sort of OpenTracing Tracer instance on hand.
var tracer opentracing.Tracer = ...
...
// Initialize the gRPC server.
s := grpc.NewServer(
... // other options
grpc.UnaryInterceptor(
otgrpc.OpenTracingServerInterceptor(tracer)),
grpc.StreamInterceptor(
otgrpc.OpenTracingStreamServerInterceptor(tracer)))
// All future RPC activity involving `s` will be automatically traced.
```
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