mirror of https://github.com/dapr/go-sdk.git
73 lines
2.3 KiB
Go
73 lines
2.3 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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"fmt"
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"github.com/golang/protobuf/ptypes/empty"
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"github.com/pkg/errors"
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pb "github.com/dapr/dapr/pkg/proto/runtime/v1"
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"github.com/dapr/go-sdk/service/common"
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)
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// AddBindingInvocationHandler appends provided binding invocation handler with its name to the service.
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func (s *Server) AddBindingInvocationHandler(name string, fn common.BindingInvocationHandler) error {
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if name == "" {
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return fmt.Errorf("binding name required")
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}
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if fn == nil {
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return fmt.Errorf("binding handler required")
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}
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s.bindingHandlers[name] = fn
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return nil
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}
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// ListInputBindings is called by Dapr to get the list of bindings the app will get invoked by. In this example, we are telling Dapr
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// To invoke our app with a binding named storage.
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func (s *Server) ListInputBindings(ctx context.Context, in *empty.Empty) (*pb.ListInputBindingsResponse, error) {
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list := make([]string, 0)
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for k := range s.bindingHandlers {
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list = append(list, k)
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}
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return &pb.ListInputBindingsResponse{
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Bindings: list,
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}, nil
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}
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// OnBindingEvent gets invoked every time a new event is fired from a registered binding. The message carries the binding name, a payload and optional metadata.
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func (s *Server) OnBindingEvent(ctx context.Context, in *pb.BindingEventRequest) (*pb.BindingEventResponse, error) {
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if in == nil {
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return nil, errors.New("nil binding event request")
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}
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if fn, ok := s.bindingHandlers[in.Name]; ok {
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e := &common.BindingEvent{
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Data: in.Data,
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Metadata: in.Metadata,
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}
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data, err := fn(ctx, e)
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if err != nil {
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return nil, errors.Wrapf(err, "error executing %s binding", in.Name)
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}
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return &pb.BindingEventResponse{
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Data: data,
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}, nil
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}
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return nil, fmt.Errorf("binding not implemented: %s", in.Name)
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}
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