Remove deprecated logic, modernise project (#52)

* Modernize, rewrite

* Clean up old scripts

* Fix formatting in README.md

* Documentation improvements

* Add staticcheck (and fix issues)

* gofmt, fix staticcheck in travis

* Docs, gomod

* Editorconfig file

* Clean up tests a bit

Author: marcusirgens

.editorconfig

@@ -0,0 +1,17 @@
+root = true
+
+[*]
+charset = utf-8
+end_of_line = lf
+indent_size = 4
+indent_style = space
+insert_final_newline = true
+max_line_length = 120
+tab_width = 4
+
+[*.proto]
+indent_size = 2
+tab_width = 2
+
+[{*.go,*.go2}]
+indent_style = tab

.travis.yml

@@ -1,13 +1,12 @@
 sudo: false
 language: go
 go:
-  - 1.7
-  - 1.8
+  - "1.14"
+  - "1.15"
+  - "1.16"
 
 install:
-  - go get google.golang.org/grpc
-  - go get golang.org/x/net/context
-  - go get github.com/stretchr/testify
+  - go get ./...
 
 script:
- - go test -race -v ./...
+ - make test-ci

Makefile

@@ -0,0 +1,11 @@
+.PHONY: test test-ci install-staticcheck
+
+test:
+	go vet ./...
+	go test -race -v  -timeout 5m ./...
+	CGO_ENABLED=0 staticcheck -f stylish --go 1.14 ./...
+
+install-staticcheck:
+	go get honnef.co/go/tools/cmd/staticcheck
+
+test-ci: install-staticcheck | test

README.md

@@ -2,7 +2,7 @@
 
 [![Travis Build](https://travis-ci.org/mwitkow/grpc-proxy.svg?branch=master)](https://travis-ci.org/mwitkow/grpc-proxy)
 [![Go Report Card](https://goreportcard.com/badge/github.com/mwitkow/grpc-proxy)](https://goreportcard.com/report/github.com/mwitkow/grpc-proxy)
-[![GoDoc](http://img.shields.io/badge/GoDoc-Reference-blue.svg)](https://godoc.org/github.com/mwitkow/grpc-proxy)
+[![Go Reference](https://pkg.go.dev/badge/github.com/mwitkow/grpc-proxy.svg)](https://pkg.go.dev/github.com/mwitkow/grpc-proxy)
 [![Apache 2.0 License](https://img.shields.io/badge/License-Apache%202.0-blue.svg)](LICENSE)
 
 [gRPC Go](https://github.com/grpc/grpc-go) Proxy server
@@ -23,28 +23,39 @@ is a generic gRPC reverse proxy handler.
 The package [`proxy`](proxy/) contains a generic gRPC reverse proxy handler that allows a gRPC server to
 not know about registered handlers or their data types. Please consult the docs, here's an exaple usage.
 
-Defining a `StreamDirector` that decides where (if at all) to send the request
+You can call `proxy.NewProxy` to create a `*grpc.Server` that proxies requests.
 ```go
-director = func(ctx context.Context, fullMethodName string) (*grpc.ClientConn, error) {
+proxy := proxy.NewProxy(clientConn)
+``` 
+
+More advanced users will want to define a `StreamDirector` that can make more complex decisions on what
+to do with the request.
+```go
+director = func(ctx context.Context, fullMethodName string) (context.Context, *grpc.ClientConn, error) {
+    md, _ := metadata.FromIncomingContext(ctx)
+    outCtx = metadata.NewOutgoingContext(ctx, md.Copy())
+    return outCtx, cc, nil
+	
     // Make sure we never forward internal services.
     if strings.HasPrefix(fullMethodName, "/com.example.internal.") {
-        return nil, grpc.Errorf(codes.Unimplemented, "Unknown method")
+        return outCtx, nil, status.Errorf(codes.Unimplemented, "Unknown method")
     }
-    md, ok := metadata.FromContext(ctx)
+    
     if ok {
         // Decide on which backend to dial
         if val, exists := md[":authority"]; exists && val[0] == "staging.api.example.com" {
             // Make sure we use DialContext so the dialing can be cancelled/time out together with the context.
-            return grpc.DialContext(ctx, "api-service.staging.svc.local", grpc.WithCodec(proxy.Codec()))
+            return outCtx, grpc.DialContext(ctx, "api-service.staging.svc.local", grpc.WithCodec(proxy.Codec())), nil
         } else if val, exists := md[":authority"]; exists && val[0] == "api.example.com" {
-            return grpc.DialContext(ctx, "api-service.prod.svc.local", grpc.WithCodec(proxy.Codec()))
+            return outCtx, grpc.DialContext(ctx, "api-service.prod.svc.local", grpc.WithCodec(proxy.Codec())), nil
         }
     }
-    return nil, grpc.Errorf(codes.Unimplemented, "Unknown method")
+    return outCtx, nil, status.Errorf(codes.Unimplemented, "Unknown method")
 }
 ```
+
 Then you need to register it with a `grpc.Server`. The server may have other handlers that will be served
-locally:
+locally.
 
 ```go
 server := grpc.NewServer(
@@ -53,6 +64,19 @@ server := grpc.NewServer(
 pb_test.RegisterTestServiceServer(server, &testImpl{})
 ```
 
+## Testing
+To make debugging a bit simpler, there are some helpers.
+
+`testservice` contains a method `TestTestServiceServerImpl` which performs a complete test against
+the reference implementation of the `TestServiceServer`.
+
+In `proxy_test.go`, the test framework spins up a `TestServiceServer` that it tests the proxy 
+against. To make debugging a bit simpler (eg. if the developer needs to step into 
+`google.golang.org/grpc` methods), this `TestServiceServer` can be provided by a server by 
+passing `-test-backend=addr` to `go test`. A simple, local-only implementation of 
+`TestServiceServer` exists in [`testservice/server`](./testservice/server).
+
+
 ## License
 
 `grpc-proxy` is released under the Apache 2.0 license. See [LICENSE.txt](LICENSE.txt).

checkup.sh

@@ -0,0 +1,16 @@
+module github.com/mwitkow/grpc-proxy
+
+go 1.14
+
+require (
+	github.com/golang/protobuf v1.5.2 // indirect
+	github.com/stretchr/testify v1.7.0
+	golang.org/x/net v0.0.0-20210331212208-0fccb6fa2b5c // indirect
+	golang.org/x/sync v0.0.0-20210220032951-036812b2e83c
+	golang.org/x/sys v0.0.0-20210331175145-43e1dd70ce54 // indirect
+	golang.org/x/text v0.3.6 // indirect
+	google.golang.org/genproto v0.0.0-20210401141331-865547bb08e2 // indirect
+	google.golang.org/grpc v1.36.1
+	google.golang.org/protobuf v1.26.0
+	honnef.co/go/tools v0.1.3
+)

fixup.sh

@@ -0,0 +1,137 @@
+cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
+github.com/BurntSushi/toml v0.3.1 h1:WXkYYl6Yr3qBf1K79EBnL4mak0OimBfB0XUf9Vl28OQ=
+github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
+github.com/census-instrumentation/opencensus-proto v0.2.1/go.mod h1:f6KPmirojxKA12rnyqOA5BBL4O983OfeGPqjHWSTneU=
+github.com/client9/misspell v0.3.4/go.mod h1:qj6jICC3Q7zFZvVWo7KLAzC3yx5G7kyvSDkc90ppPyw=
+github.com/cncf/udpa/go v0.0.0-20201120205902-5459f2c99403/go.mod h1:WmhPx2Nbnhtbo57+VJT5O0JRkEi1Wbu0z5j0R8u5Hbk=
+github.com/davecgh/go-spew v1.1.0 h1:ZDRjVQ15GmhC3fiQ8ni8+OwkZQO4DARzQgrnXU1Liz8=
+github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/envoyproxy/go-control-plane v0.9.0/go.mod h1:YTl/9mNaCwkRvm6d1a2C3ymFceY/DCBVvsKhRF0iEA4=
+github.com/envoyproxy/go-control-plane v0.9.1-0.20191026205805-5f8ba28d4473/go.mod h1:YTl/9mNaCwkRvm6d1a2C3ymFceY/DCBVvsKhRF0iEA4=
+github.com/envoyproxy/go-control-plane v0.9.9-0.20201210154907-fd9021fe5dad/go.mod h1:cXg6YxExXjJnVBQHBLXeUAgxn2UodCpnH306RInaBQk=
+github.com/envoyproxy/protoc-gen-validate v0.1.0/go.mod h1:iSmxcyjqTsJpI2R4NaDN7+kN2VEUnK/pcBlmesArF7c=
+github.com/golang/glog v0.0.0-20160126235308-23def4e6c14b/go.mod h1:SBH7ygxi8pfUlaOkMMuAQtPIUF8ecWP5IEl/CR7VP2Q=
+github.com/golang/mock v1.1.1/go.mod h1:oTYuIxOrZwtPieC+H1uAHpcLFnEyAGVDL/k47Jfbm0A=
+github.com/golang/protobuf v1.2.0/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
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