mirror of https://github.com/dapr/go-sdk.git
73 lines
1.7 KiB
Go
Executable File
73 lines
1.7 KiB
Go
Executable File
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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// AddBindingInvocationHandler appends provided binding invocation handler with its route to the service
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func (s *Server) AddBindingInvocationHandler(route string, fn func(ctx context.Context, in *common.BindingEvent) (out []byte, err error)) error {
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if route == "" {
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return fmt.Errorf("binding route 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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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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var content []byte
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if r.ContentLength > 0 {
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body, 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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content = body
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}
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// assuming Dapr doesn't pass multiple values for key
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meta := map[string]string{}
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for k, values := range r.Header {
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// TODO: Need to figure out how to parse out only the headers set in the binding + Traceparent
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// if k == "raceparent" || strings.HasPrefix(k, "dapr") {
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for _, v := range values {
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meta[k] = v
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}
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// }
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}
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// execute handler
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in := &common.BindingEvent{
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Data: content,
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Metadata: meta,
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}
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out, err := fn(r.Context(), in)
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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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if out == nil {
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out = []byte("{}")
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}
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w.Header().Add("Content-Type", "application/json")
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if _, err := w.Write(out); 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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return nil
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}
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