mirror of https://github.com/dapr/go-sdk.git
79 lines
2.1 KiB
Go
79 lines
2.1 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 http
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import (
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"context"
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"fmt"
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"io/ioutil"
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"net/http"
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"strings"
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"github.com/dapr/go-sdk/service/common"
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)
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// AddServiceInvocationHandler appends provided service invocation handler with its route to the service.
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func (s *Server) AddServiceInvocationHandler(route string, fn func(ctx context.Context, in *common.InvocationEvent) (out *common.Content, err error)) error {
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if route == "" {
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return fmt.Errorf("service route required")
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}
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if fn == nil {
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return fmt.Errorf("invocation handler required")
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}
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if !strings.HasPrefix(route, "/") {
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route = fmt.Sprintf("/%s", route)
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}
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s.mux.Handle(route, optionsHandler(http.HandlerFunc(
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func(w http.ResponseWriter, r *http.Request) {
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// capture http args
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e := &common.InvocationEvent{
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Verb: r.Method,
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QueryString: r.URL.RawQuery,
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ContentType: r.Header.Get("Content-type"),
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}
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// check for post with no data
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if r.ContentLength > 0 {
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content, err := ioutil.ReadAll(r.Body)
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if err != nil {
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http.Error(w, err.Error(), http.StatusBadRequest)
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return
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}
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e.Data = content
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}
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// execute handler
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o, err := fn(r.Context(), e)
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if err != nil {
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http.Error(w, err.Error(), http.StatusInternalServerError)
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return
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}
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// write to response if handler returned data
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if o != nil && o.Data != nil {
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if o.ContentType != "" {
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w.Header().Set("Content-type", o.ContentType)
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}
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if _, err := w.Write(o.Data); err != nil {
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http.Error(w, err.Error(), http.StatusInternalServerError)
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return
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}
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}
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})))
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return nil
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}
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