// API handler is the default handler which takes api.Request and returns api.Response
func (a *apiHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
request, err := requestToProto(r)
if err != nil {
er := errors.InternalServerError("go.micro.api", err.Error())
w.Header().Set("Content-Type", "application/json")
w.WriteHeader(500)
w.Write([]byte(er.Error()))
return
}
// get service and method
service, method := pathToReceiver(a.Namespace, r.URL.Path)
// create request and response
req := (*cmd.DefaultOptions().Client).NewRequest(service, method, request)
rsp := &api.Response{}
// create the context from headers
ctx := helper.RequestToContext(r)
if err := (*cmd.DefaultOptions().Client).Call(ctx, req, rsp); err != nil {
w.Header().Set("Content-Type", "application/json")
ce := errors.Parse(err.Error())
switch ce.Code {
case 0:
w.WriteHeader(500)
default:
w.WriteHeader(int(ce.Code))
}
w.Write([]byte(ce.Error()))
return
}
for _, header := range rsp.GetHeader() {
for _, val := range header.Values {
w.Header().Add(header.Key, val)
}
}
if len(w.Header().Get("Content-Type")) == 0 {
w.Header().Set("Content-Type", "application/json")
}
w.WriteHeader(int(rsp.StatusCode))
w.Write([]byte(rsp.Body))
}
// RPC Handler passes on a JSON or form encoded RPC request to
// a service.
func RPC(w http.ResponseWriter, r *http.Request) {
if r.Method != "POST" {
http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
return
}
defer r.Body.Close()
badRequest := func(description string) {
e := errors.BadRequest("go.micro.rpc", description)
w.WriteHeader(400)
w.Write([]byte(e.Error()))
}
var service, method, address string
var request interface{}
// response content type
w.Header().Set("Content-Type", "application/json")
switch r.Header.Get("Content-Type") {
case "application/json":
var rpcReq rpcRequest
d := json.NewDecoder(r.Body)
d.UseNumber()
if err := d.Decode(&rpcReq); err != nil {
badRequest(err.Error())
return
}
service = rpcReq.Service
method = rpcReq.Method
address = rpcReq.Address
request = rpcReq.Request
// JSON as string
if req, ok := rpcReq.Request.(string); ok {
d := json.NewDecoder(strings.NewReader(req))
d.UseNumber()
if err := d.Decode(&request); err != nil {
badRequest("error decoding request string: " + err.Error())
return
}
}
default:
r.ParseForm()
service = r.Form.Get("service")
method = r.Form.Get("method")
d := json.NewDecoder(strings.NewReader(r.Form.Get("request")))
d.UseNumber()
if err := d.Decode(&request); err != nil {
badRequest("error decoding request string: " + err.Error())
return
}
}
if len(service) == 0 {
badRequest("invalid service")
return
}
if len(method) == 0 {
badRequest("invalid method")
return
}
// create request/response
var response map[string]interface{}
var err error
req := (*cmd.DefaultOptions().Client).NewJsonRequest(service, method, request)
// create context
ctx := helper.RequestToContext(r)
// remote call
if len(address) > 0 {
err = (*cmd.DefaultOptions().Client).CallRemote(ctx, address, req, &response)
} else {
err = (*cmd.DefaultOptions().Client).Call(ctx, req, &response)
}
if err != nil {
ce := errors.Parse(err.Error())
switch ce.Code {
case 0:
// assuming it's totally screwed
ce.Code = 500
ce.Id = "go.micro.rpc"
ce.Status = http.StatusText(500)
ce.Detail = "error during request: " + ce.Detail
w.WriteHeader(500)
default:
w.WriteHeader(int(ce.Code))
}
w.Write([]byte(ce.Error()))
return
}
b, _ := json.Marshal(response)
w.Header().Set("Content-Length", strconv.Itoa(len(b)))
w.Write(b)
}
// RPCX Handler is an alternative handler which passes through an RPC request without modification
func (h *rpcxHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
if r.Method != "POST" {
http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
return
}
defer r.Body.Close()
// get service/method
service, method := pathToReceiver(h.Namespace, r.URL.Path)
ct := r.Header.Get("Content-Type")
// Strip charset from Content-Type (like `application/json; charset=UTF-8`)
if idx := strings.IndexRune(ct, ';'); idx >= 0 {
ct = ct[:idx]
}
switch ct {
case "application/json":
// response content type
w.Header().Set("Content-Type", "application/json")
// get request
br, err := ioutil.ReadAll(r.Body)
if err != nil {
e := errors.InternalServerError("go.micro.api", err.Error())
http.Error(w, e.Error(), 500)
return
}
// use as raw json
request := json.RawMessage(br)
// create request/response
var response json.RawMessage
req := (*cmd.DefaultOptions().Client).NewJsonRequest(service, method, &request)
// create context
ctx := helper.RequestToContext(r)
// make the call
if err := (*cmd.DefaultOptions().Client).Call(ctx, req, &response); err != nil {
ce := errors.Parse(err.Error())
switch ce.Code {
case 0:
// assuming it's totally screwed
ce.Code = 500
ce.Id = "go.micro.api"
ce.Status = http.StatusText(500)
ce.Detail = "error during request: " + ce.Detail
w.WriteHeader(500)
default:
w.WriteHeader(int(ce.Code))
}
w.Write([]byte(ce.Error()))
return
}
b, _ := response.MarshalJSON()
w.Header().Set("Content-Length", strconv.Itoa(len(b)))
w.Write(b)
case "application/proto", "application/protobuf":
// get request
br, err := ioutil.ReadAll(r.Body)
if err != nil {
e := errors.InternalServerError("go.micro.api", err.Error())
http.Error(w, e.Error(), 500)
return
}
// use as raw proto
request := proto.NewMessage(br)
// create request/response
response := &proto.Message{}
req := (*cmd.DefaultOptions().Client).NewProtoRequest(service, method, request)
// create context
ctx := helper.RequestToContext(r)
// make the call
if err := (*cmd.DefaultOptions().Client).Call(ctx, req, response); err != nil {
ce := errors.Parse(err.Error())
switch ce.Code {
case 0:
// assuming it's totally screwed
ce.Code = 500
ce.Id = "go.micro.api"
ce.Status = http.StatusText(500)
ce.Detail = "error during request: " + ce.Detail
w.WriteHeader(500)
default:
w.WriteHeader(int(ce.Code))
}
// response content type
w.Header().Set("Content-Type", "application/json")
w.Write([]byte(ce.Error()))
return
}
b, _ := response.Marshal()
w.Header().Set("Content-Type", r.Header.Get("Content-Type"))
w.Header().Set("Content-Length", strconv.Itoa(len(b)))
w.Write(b)
default:
http.Error(w, "unknown content-type", 500)
return
}
}