Go gRPC Middleware
gRPC Go Middleware: interceptors, helpers, utilities.
Middleware
gRPC Go recently acquired support for
Interceptors, i.e. middleware
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, here's an example:
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- a customizable (viaAuthFunc) piece of auth middleware
Logging
grpc_ctxtags- a library that adds aTagmap to context, with data populated from request bodygrpc_zap- integration of zap logging library into gRPC handlers.grpc_logrus- integration of logrus logging library into gRPC handlers.grpc_kit- integration of go-kit logging library into gRPC handlers.
Monitoring
grpc_prometheus⚡ - Prometheus client-side and server-side monitoring middlewareotgrpc⚡ - OpenTracing client-side and server-side interceptorsgrpc_opentracing- OpenTracing client-side and server-side interceptors with support for streaming and handler-returned tags
Client
grpc_retry- a generic gRPC response code retry mechanism, client-side middleware
Server
grpc_validator- codegen inbound message validation from.protooptionsgrpc_recovery- turn panics into gRPC errorsratelimit- grpc rate limiting by your own limiter
Status
This code has been running in production since May 2016 as the basis of the gRPC micro services stack at Improbable.
Additional tooling will be added, and contributions are welcome.
License
go-grpc-middleware is released under the Apache 2.0 license. See the LICENSE file for details.