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90 lines
2.5 KiB
90 lines
2.5 KiB
8 years ago
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/*
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Copyright 2016 The Kubernetes Authors All rights reserved.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package tiller
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import (
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"fmt"
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"log"
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"strings"
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"golang.org/x/net/context"
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"google.golang.org/grpc"
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"google.golang.org/grpc/metadata"
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"k8s.io/helm/pkg/version"
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)
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// maxMsgSize use 10MB as the default message size limit.
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// grpc library default is 4MB
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var maxMsgSize = 1024 * 1024 * 10
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// NewServer creates a new grpc server.
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func NewServer() *grpc.Server {
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return grpc.NewServer(
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grpc.MaxMsgSize(maxMsgSize),
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grpc.UnaryInterceptor(newUnaryInterceptor()),
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grpc.StreamInterceptor(newStreamInterceptor()),
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)
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}
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func newUnaryInterceptor() grpc.UnaryServerInterceptor {
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return func(ctx context.Context, req interface{}, info *grpc.UnaryServerInfo, handler grpc.UnaryHandler) (resp interface{}, err error) {
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if err := checkClientVersion(ctx); err != nil {
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// whitelist GetVersion() from the version check
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if _, m := splitMethod(info.FullMethod); m != "GetVersion" {
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log.Println(err)
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return nil, err
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}
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}
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return handler(ctx, req)
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}
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}
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func newStreamInterceptor() grpc.StreamServerInterceptor {
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return func(srv interface{}, ss grpc.ServerStream, info *grpc.StreamServerInfo, handler grpc.StreamHandler) error {
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if err := checkClientVersion(ss.Context()); err != nil {
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log.Println(err)
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return err
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}
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return handler(srv, ss)
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}
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}
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func splitMethod(fullMethod string) (string, string) {
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if frags := strings.Split(fullMethod, "/"); len(frags) == 3 {
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return frags[1], frags[2]
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}
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return "unknown", "unknown"
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}
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func versionFromContext(ctx context.Context) string {
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if md, ok := metadata.FromContext(ctx); ok {
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if v, ok := md["x-helm-api-client"]; ok && len(v) > 0 {
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return v[0]
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}
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}
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return ""
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}
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func checkClientVersion(ctx context.Context) error {
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clientVersion := versionFromContext(ctx)
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if !version.IsCompatible(clientVersion, version.Version) {
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return fmt.Errorf("incompatible versions client: %s server: %s", clientVersion, version.Version)
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}
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return nil
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}
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