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# Go gRPC Middleware
[](https://travis-ci.org/grpc-ecosystem/go-grpc-middleware)
[](https://goreportcard.com/report/github.com/grpc-ecosystem/go-grpc-middleware)
[](https://godoc.org/github.com/grpc-ecosystem/go-grpc-middleware)
[](https://sourcegraph.com/github.com/grpc-ecosystem/go-grpc-middleware/?badge)
[](https://codecov.io/gh/grpc-ecosystem/go-grpc-middleware)
[](LICENSE)
[](#status)
[](https://join.slack.com/t/improbable-eng/shared_invite/enQtMzQ1ODcyMzQ5MjM4LWY5ZWZmNGM2ODc5MmViNmQ3ZTA3ZTY3NzQwOTBlMTkzZmIxZTIxODk0OWU3YjZhNWVlNDU3MDlkZGViZjhkMjc)
[gRPC Go](https://github.com/grpc/grpc-go) Middleware: interceptors, helpers, utilities.
**Important** The repo recently moved to `github.com/grpc-ecosystem/go-grpc-middleware`, please update your import paths.
## Middleware
[gRPC Go](https://github.com/grpc/grpc-go) recently acquired support for
Interceptors, i.e. [middleware](https://medium.com/@matryer/writing-middleware-in-golang-and-how-go-makes-it-so-much-fun-4375c1246e81#.gv7tdlghs)
that is executed either on the gRPC Server before the request is passed onto the user's application logic, or on the gRPC client either around the user call. It is a perfect way to implement
common patterns: auth, logging, message, validation, retries or monitoring.
These are generic building blocks that make it easy to build multiple microservices easily.
The purpose of this repository is to act as a go-to point for such reusable functionality. It contains
some of them itself, but also will link to useful external repos.
`grpc_middleware` itself provides support for chaining interceptors. See [Documentation](DOC.md), but here's an example:
```go
import "github.com/grpc-ecosystem/go-grpc-middleware"
myServer := grpc.NewServer(
grpc.StreamInterceptor(grpc_middleware.ChainStreamServer(
grpc_ctxtags.StreamServerInterceptor(),
grpc_opentracing.StreamServerInterceptor(),
grpc_prometheus.StreamServerInterceptor,
grpc_zap.StreamServerInterceptor(zapLogger),
grpc_auth.StreamServerInterceptor(myAuthFunction),
grpc_recovery.StreamServerInterceptor(),
)),
grpc.UnaryInterceptor(grpc_middleware.ChainUnaryServer(
grpc_ctxtags.UnaryServerInterceptor(),
grpc_opentracing.UnaryServerInterceptor(),
grpc_prometheus.UnaryServerInterceptor,
grpc_zap.UnaryServerInterceptor(zapLogger),
grpc_auth.UnaryServerInterceptor(myAuthFunction),
grpc_recovery.UnaryServerInterceptor(),
)),
)
```
## Interceptors
*Please send a PR to add new interceptors or middleware to this list*
#### Auth
* [`grpc_auth`](auth) - a customizable (via `AuthFunc`) piece of auth middleware
#### Logging
* [`grpc_ctxtags`](tags/) - a library that adds a `Tag` map to context, with data populated from request body
* [`grpc_zap`](logging/zap/) - integration of [zap](https://github.com/uber-go/zap) logging library into gRPC handlers.
* [`grpc_logrus`](logging/logrus/) - integration of [logrus](https://github.com/sirupsen/logrus) logging library into gRPC handlers.
#### Monitoring
* [`grpc_prometheus`⚡](https://github.com/grpc-ecosystem/go-grpc-prometheus) - Prometheus client-side and server-side monitoring middleware
* [`otgrpc`⚡](https://github.com/grpc-ecosystem/grpc-opentracing/tree/master/go/otgrpc) - [OpenTracing](http://opentracing.io/) client-side and server-side interceptors
* [`grpc_opentracing`](tracing/opentracing) - [OpenTracing](http://opentracing.io/) client-side and server-side interceptors with support for streaming and handler-returned tags
#### Client
* [`grpc_retry`](retry/) - a generic gRPC response code retry mechanism, client-side middleware
#### Server
* [`grpc_validator`](validator/) - codegen inbound message validation from `.proto` options
* [`grpc_recovery`](recovery/) - turn panics into gRPC errors
## Status
This code has been running in *production* since May 2016 as the basis of the gRPC micro services stack at [Improbable](https://improbable.io).
Additional tooling will be added, and contributions are welcome.
## License
`go-grpc-middleware` is released under the Apache 2.0 license. See the [LICENSE](LICENSE) file for details.
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