mirror of https://github.com/dapr/go-sdk.git
94 lines
2.6 KiB
Go
94 lines
2.6 KiB
Go
/*
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Copyright 2021 The Dapr Authors
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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 grpc
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import (
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"context"
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"errors"
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"fmt"
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"google.golang.org/grpc/metadata"
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"google.golang.org/protobuf/types/known/anypb"
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cpb "github.com/dapr/dapr/pkg/proto/common/v1"
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cc "github.com/dapr/go-sdk/service/common"
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)
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// AddServiceInvocationHandler appends provided service invocation handler with its method to the service.
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func (s *Server) AddServiceInvocationHandler(method string, fn cc.ServiceInvocationHandler) error {
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if method == "" || method == "/" {
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return errors.New("service name required")
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}
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if method[0] == '/' {
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method = method[1:]
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}
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if fn == nil {
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return errors.New("invocation handler required")
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}
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s.invokeHandlers[method] = fn
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return nil
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}
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// OnInvoke gets invoked when a remote service has called the app through Dapr.
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func (s *Server) OnInvoke(ctx context.Context, in *cpb.InvokeRequest) (*cpb.InvokeResponse, error) {
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if in == nil {
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return nil, errors.New("nil invoke request")
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}
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if s.authToken != "" {
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if md, ok := metadata.FromIncomingContext(ctx); !ok {
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return nil, errors.New("authentication failed")
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} else if vals := md.Get(cc.APITokenKey); len(vals) > 0 {
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if vals[0] != s.authToken {
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return nil, errors.New("authentication failed: app token mismatch")
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}
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} else {
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return nil, errors.New("authentication failed. app token key not exist")
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}
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}
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if fn, ok := s.invokeHandlers[in.GetMethod()]; ok {
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e := &cc.InvocationEvent{}
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e.ContentType = in.GetContentType()
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if in.GetData() != nil {
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e.Data = in.GetData().GetValue()
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e.DataTypeURL = in.GetData().GetTypeUrl()
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}
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if in.GetHttpExtension() != nil {
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e.Verb = in.GetHttpExtension().GetVerb().String()
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e.QueryString = in.GetHttpExtension().GetQuerystring()
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}
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ct, er := fn(ctx, e)
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if er != nil {
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return nil, er
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}
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if ct == nil {
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return &cpb.InvokeResponse{}, nil
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}
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return &cpb.InvokeResponse{
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ContentType: ct.ContentType,
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Data: &anypb.Any{
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Value: ct.Data,
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TypeUrl: ct.DataTypeURL,
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},
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}, nil
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}
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return nil, fmt.Errorf("method not implemented: %s", in.GetMethod())
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}
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