mirror of https://github.com/docker/compose.git
128 lines
3.5 KiB
Go
128 lines
3.5 KiB
Go
/*
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Copyright 2020 Docker, Inc.
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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 server
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import (
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"context"
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"errors"
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"strings"
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"google.golang.org/grpc"
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"google.golang.org/grpc/metadata"
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"github.com/docker/api/client"
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"github.com/docker/api/config"
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apicontext "github.com/docker/api/context"
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"github.com/docker/api/context/store"
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"github.com/docker/api/server/proxy"
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)
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// key is the key where the current docker context is stored in the metadata
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// of a gRPC request
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const key = "context_key"
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// unaryServerInterceptor configures the context and sends it to the next handler
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func unaryServerInterceptor(clictx context.Context) grpc.UnaryServerInterceptor {
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return func(ctx context.Context, req interface{}, info *grpc.UnaryServerInfo, handler grpc.UnaryHandler) (interface{}, error) {
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currentContext, err := getIncomingContext(ctx)
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if err != nil {
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currentContext, err = getConfigContext(clictx)
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if err != nil {
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return nil, err
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}
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}
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configuredCtx, err := configureContext(clictx, currentContext, info.FullMethod)
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if err != nil {
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return nil, err
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}
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return handler(configuredCtx, req)
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}
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}
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// streamServerInterceptor configures the context and sends it to the next handler
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func streamServerInterceptor(clictx context.Context) grpc.StreamServerInterceptor {
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return func(srv interface{}, ss grpc.ServerStream, info *grpc.StreamServerInfo, handler grpc.StreamHandler) error {
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currentContext, err := getIncomingContext(ss.Context())
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if err != nil {
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currentContext, err = getConfigContext(clictx)
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if err != nil {
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return err
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}
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}
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ctx, err := configureContext(clictx, currentContext, info.FullMethod)
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if err != nil {
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return err
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}
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return handler(srv, &contextServerStream{
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ss: ss,
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ctx: ctx,
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})
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}
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}
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// Returns the current context from the configuration file
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func getConfigContext(ctx context.Context) (string, error) {
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configDir := config.Dir(ctx)
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configFile, err := config.LoadFile(configDir)
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if err != nil {
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return "", err
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}
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return configFile.CurrentContext, nil
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}
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// Returns the context set by the caller if any, error otherwise
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func getIncomingContext(ctx context.Context) (string, error) {
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if md, ok := metadata.FromIncomingContext(ctx); ok {
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if key, ok := md[key]; ok {
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return key[0], nil
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}
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}
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return "", errors.New("not found")
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}
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// configureContext populates the request context with objects the client
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// needs: the context store and the api client
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func configureContext(ctx context.Context, currentContext string, method string) (context.Context, error) {
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configDir := config.Dir(ctx)
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ctx = apicontext.WithCurrentContext(ctx, currentContext)
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// The contexts service doesn't need the client
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if !strings.Contains(method, "/com.docker.api.protos.context.v1.Contexts") {
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c, err := client.New(ctx)
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if err != nil {
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return nil, err
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}
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ctx, err = proxy.WithClient(ctx, c)
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if err != nil {
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return nil, err
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}
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}
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s, err := store.New(store.WithRoot(configDir))
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if err != nil {
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return nil, err
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}
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ctx = store.WithContextStore(ctx, s)
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return ctx, nil
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}
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