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This change refactors gRPC code used within the v3 API package into generic code that can be used for managing gRPC and gRPC Gateway.
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| Original file line number | Diff line number | Diff line change |
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| // Copyright 2018 clair authors | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
|
|
||
| package grpcutil | ||
|
|
||
| import ( | ||
| "crypto/tls" | ||
| "net/http" | ||
| "strings" | ||
|
|
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| "github.com/grpc-ecosystem/grpc-gateway/runtime" | ||
| "golang.org/x/net/context" | ||
| "google.golang.org/grpc" | ||
| "google.golang.org/grpc/credentials" | ||
| ) | ||
|
|
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| // RegisterServiceHandlerFunc is a function that registers ServiceHandlers with | ||
| // a ServeMux. | ||
| type RegisterServiceHandlerFunc func(context.Context, *runtime.ServeMux, *grpc.ClientConn) error | ||
|
|
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| // NewGateway creates a new http.Handler and grpc.ClientConn with the provided | ||
| // gRPC Services registered. | ||
| func NewGateway(addr string, tlsConfig *tls.Config, funcs []RegisterServiceHandlerFunc) (http.Handler, *grpc.ClientConn, error) { | ||
| // Configure the right DialOptions the for TLS configuration. | ||
| var dialOpts []grpc.DialOption | ||
| if tlsConfig != nil { | ||
| var gwTLSConfig *tls.Config | ||
| gwTLSConfig = tlsConfig.Clone() | ||
| gwTLSConfig.InsecureSkipVerify = true // Trust the local server. | ||
| dialOpts = append(dialOpts, grpc.WithTransportCredentials(credentials.NewTLS(gwTLSConfig))) | ||
| } else { | ||
| dialOpts = append(dialOpts, grpc.WithInsecure()) | ||
| } | ||
|
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| conn, err := grpc.DialContext(context.TODO(), addr, dialOpts...) | ||
| if err != nil { | ||
| return nil, nil, err | ||
| } | ||
|
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| // Register services. | ||
| srvmux := runtime.NewServeMux() | ||
| for _, fn := range funcs { | ||
| err = fn(context.TODO(), srvmux, conn) | ||
| if err != nil { | ||
| return nil, nil, err | ||
| } | ||
| } | ||
|
|
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| return srvmux, conn, nil | ||
| } | ||
|
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| // IsGRPCRequest returns true if the provided request came from a gRPC client. | ||
| // | ||
| // Its logic is a partial recreation of gRPC's internal checks, see: | ||
| // https://github.com/grpc/grpc-go/blob/01de3de/transport/handler_server.go#L61:L69 | ||
| func IsGRPCRequest(r *http.Request) bool { | ||
| return r.ProtoMajor == 2 && strings.Contains(r.Header.Get("Content-Type"), "application/grpc") | ||
| } | ||
|
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| // HandlerFunc returns an http.Handler that delegates to grpc.Server on | ||
| // incoming gRPC connections otherwise serves with the provided handler. | ||
| func HandlerFunc(grpcServer *grpc.Server, otherwise http.Handler) http.Handler { | ||
| return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) { | ||
| if IsGRPCRequest(r) { | ||
| grpcServer.ServeHTTP(w, r) | ||
| } else { | ||
| otherwise.ServeHTTP(w, r) | ||
| } | ||
| }) | ||
| } |
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