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Uses github.com/libopenstorage/secrets to communicate with Vault. This removes the need for maintaining our own limited Vault APIs. By adding the new dependency, several other packages got updated in the process. Unused indirect dependencies have been removed from go.mod. Signed-off-by: Niels de Vos <ndevos@redhat.com>
85 lines
4.6 KiB
Markdown
85 lines
4.6 KiB
Markdown
# Go gRPC Middleware
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[](https://travis-ci.org/grpc-ecosystem/go-grpc-middleware)
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[](https://goreportcard.com/report/github.com/grpc-ecosystem/go-grpc-middleware)
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[](https://godoc.org/github.com/grpc-ecosystem/go-grpc-middleware)
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[](https://sourcegraph.com/github.com/grpc-ecosystem/go-grpc-middleware/?badge)
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[](https://codecov.io/gh/grpc-ecosystem/go-grpc-middleware)
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[](LICENSE)
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[](#status)
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[](https://join.slack.com/t/improbable-eng/shared_invite/enQtMzQ1ODcyMzQ5MjM4LWY5ZWZmNGM2ODc5MmViNmQ3ZTA3ZTY3NzQwOTBlMTkzZmIxZTIxODk0OWU3YjZhNWVlNDU3MDlkZGViZjhkMjc)
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[gRPC Go](https://github.com/grpc/grpc-go) Middleware: interceptors, helpers, utilities.
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## Middleware
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[gRPC Go](https://github.com/grpc/grpc-go) recently acquired support for
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Interceptors, i.e. [middleware](https://medium.com/@matryer/writing-middleware-in-golang-and-how-go-makes-it-so-much-fun-4375c1246e81#.gv7tdlghs)
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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
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common patterns: auth, logging, message, validation, retries or monitoring.
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These are generic building blocks that make it easy to build multiple microservices easily.
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The purpose of this repository is to act as a go-to point for such reusable functionality. It contains
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some of them itself, but also will link to useful external repos.
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`grpc_middleware` itself provides support for chaining interceptors, here's an example:
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```go
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import "github.com/grpc-ecosystem/go-grpc-middleware"
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myServer := grpc.NewServer(
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grpc.StreamInterceptor(grpc_middleware.ChainStreamServer(
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grpc_ctxtags.StreamServerInterceptor(),
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grpc_opentracing.StreamServerInterceptor(),
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grpc_prometheus.StreamServerInterceptor,
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grpc_zap.StreamServerInterceptor(zapLogger),
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grpc_auth.StreamServerInterceptor(myAuthFunction),
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grpc_recovery.StreamServerInterceptor(),
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)),
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grpc.UnaryInterceptor(grpc_middleware.ChainUnaryServer(
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grpc_ctxtags.UnaryServerInterceptor(),
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grpc_opentracing.UnaryServerInterceptor(),
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grpc_prometheus.UnaryServerInterceptor,
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grpc_zap.UnaryServerInterceptor(zapLogger),
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grpc_auth.UnaryServerInterceptor(myAuthFunction),
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grpc_recovery.UnaryServerInterceptor(),
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)),
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)
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```
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## Interceptors
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*Please send a PR to add new interceptors or middleware to this list*
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#### Auth
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* [`grpc_auth`](auth) - a customizable (via `AuthFunc`) piece of auth middleware
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#### Logging
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* [`grpc_ctxtags`](tags/) - a library that adds a `Tag` map to context, with data populated from request body
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* [`grpc_zap`](logging/zap/) - integration of [zap](https://github.com/uber-go/zap) logging library into gRPC handlers.
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* [`grpc_logrus`](logging/logrus/) - integration of [logrus](https://github.com/sirupsen/logrus) logging library into gRPC handlers.
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#### Monitoring
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* [`grpc_prometheus`⚡](https://github.com/grpc-ecosystem/go-grpc-prometheus) - Prometheus client-side and server-side monitoring middleware
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* [`otgrpc`⚡](https://github.com/grpc-ecosystem/grpc-opentracing/tree/master/go/otgrpc) - [OpenTracing](http://opentracing.io/) client-side and server-side interceptors
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* [`grpc_opentracing`](tracing/opentracing) - [OpenTracing](http://opentracing.io/) client-side and server-side interceptors with support for streaming and handler-returned tags
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#### Client
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* [`grpc_retry`](retry/) - a generic gRPC response code retry mechanism, client-side middleware
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#### Server
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* [`grpc_validator`](validator/) - codegen inbound message validation from `.proto` options
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* [`grpc_recovery`](recovery/) - turn panics into gRPC errors
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## Status
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This code has been running in *production* since May 2016 as the basis of the gRPC micro services stack at [Improbable](https://improbable.io).
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Additional tooling will be added, and contributions are welcome.
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## License
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`go-grpc-middleware` is released under the Apache 2.0 license. See the [LICENSE](LICENSE) file for details.
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