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chore: switch http-server example to use http.ServeMux #43

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chore: switch http-server example to use http.ServeMux #43

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50 changes: 26 additions & 24 deletions _examples/http-server/main.go
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Original file line number Diff line number Diff line change
Expand Up @@ -3,6 +3,7 @@
package main

import (
"fmt"
"io"
"net/http"
"sort"
Expand All @@ -13,39 +14,30 @@ import (
)

const Index = `/error - return a 500 error
/form - echo the fields of a POST request
/headers - echo your user agent back as a server side header
/post - echo the body of a POST request`
/form - echo the fields of a POST request
/headers - echo your user agent back as a server side header
/post - echo the body of a POST request`

func init() {
// We can't use http.ServeMux yet ( only symbol linking is supported in 'init' )
wasihttp.HandleFunc(entryHandler)
mux := http.NewServeMux()
mux.HandleFunc("/", indexHandler)
mux.HandleFunc("/error", errorHandler)
mux.HandleFunc("/form", formHandler)
mux.HandleFunc("/headers", headersHandler)
mux.HandleFunc("/post", postHandler)
wasihttp.Handle(mux)
}

func entryHandler(w http.ResponseWriter, r *http.Request) {
logger := wasilog.ContextLogger("entryHandler")
handlers := map[string]http.HandlerFunc{
"/error": errorHandler,
"/form": formHandler,
"/headers": headersHandler,
"/post": postHandler,
}
func indexHandler(w http.ResponseWriter, r *http.Request) {
logger := wasilog.ContextLogger("indexHandler")

logger.Info("Request received", "host", r.Host, "path", r.URL.Path, "agent", r.Header.Get("User-Agent"))

if handler, ok := handlers[r.URL.Path]; ok {
handler(w, r)
return
}

var keys []string
for k := range handlers {
keys = append(keys, k)
}
sort.Strings(keys)
handlers := []string{"/error", "/form", "/headers", "/post"}
sort.Strings(handlers)
w.Header().Add("content-type", "text/plain")
w.Header().Add("X-Requested-Path", r.URL.Path)
w.Header().Add("X-Existing-Paths", strings.Join(keys, ","))
w.Header().Add("X-Existing-Paths", strings.Join(handlers, ","))
_, _ = w.Write([]byte(Index))
}

Expand All @@ -60,6 +52,11 @@ func errorHandler(w http.ResponseWriter, _ *http.Request) {
}

func formHandler(w http.ResponseWriter, r *http.Request) {
if r.Method != http.MethodPost {
http.Error(w, fmt.Sprintf("Request method %s did not match POST", r.Method), http.StatusBadRequest)
return
}

if err := r.ParseForm(); err != nil {
http.Error(w, err.Error(), http.StatusBadRequest)
return
Expand All @@ -71,6 +68,11 @@ func formHandler(w http.ResponseWriter, r *http.Request) {
}

func postHandler(w http.ResponseWriter, r *http.Request) {
if r.Method != http.MethodPost {
http.Error(w, fmt.Sprintf("Request method %s did not match POST", r.Method), http.StatusBadRequest)
return
}

logger := wasilog.ContextLogger("postHandler")

w.WriteHeader(http.StatusOK)
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