micro-server-http/handler.go

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package http
import (
"context"
"fmt"
"io"
"net/http"
"reflect"
"strings"
"sync"
"go.unistack.org/micro/v3/errors"
"go.unistack.org/micro/v3/logger"
"go.unistack.org/micro/v3/metadata"
"go.unistack.org/micro/v3/register"
"go.unistack.org/micro/v3/server"
rhttp "go.unistack.org/micro/v3/util/http"
rflutil "go.unistack.org/micro/v3/util/reflect"
)
var (
DefaultErrorHandler = func(ctx context.Context, s server.Handler, w http.ResponseWriter, r *http.Request, err error, status int) {
w.WriteHeader(status)
if _, cerr := w.Write([]byte(err.Error())); cerr != nil {
logger.DefaultLogger.Errorf(ctx, "write failed: %v", cerr)
}
}
DefaultContentType = "application/json"
)
type patHandler struct {
mtype *methodType
rcvr reflect.Value
name string
}
type httpHandler struct {
opts server.HandlerOptions
hd interface{}
handlers *rhttp.Trie
name string
eps []*register.Endpoint
sopts server.Options
sync.RWMutex
}
func (h *httpHandler) Name() string {
return h.name
}
func (h *httpHandler) Handler() interface{} {
return h.hd
}
func (h *httpHandler) Endpoints() []*register.Endpoint {
return h.eps
}
func (h *httpHandler) Options() server.HandlerOptions {
return h.opts
}
func (h *httpServer) ServeHTTP(w http.ResponseWriter, r *http.Request) {
// check for http.HandlerFunc handlers
if ph, _, err := h.pathHandlers.Search(r.Method, r.URL.Path); err == nil {
ph.(http.HandlerFunc)(w, r)
return
}
ct := DefaultContentType
if htype := r.Header.Get(metadata.HeaderContentType); htype != "" {
ct = htype
}
ctx := context.WithValue(r.Context(), rspCodeKey{}, &rspCodeVal{})
ctx = context.WithValue(ctx, rspHeaderKey{}, &rspHeaderVal{})
md, ok := metadata.FromIncomingContext(ctx)
if !ok {
md = metadata.New(len(r.Header) + 8)
}
for k, v := range r.Header {
md[k] = strings.Join(v, ", ")
}
md["RemoteAddr"] = r.RemoteAddr
md["Method"] = r.Method
md["URL"] = r.URL.String()
md["Proto"] = r.Proto
md["ContentLength"] = fmt.Sprintf("%d", r.ContentLength)
md["TransferEncoding"] = strings.Join(r.TransferEncoding, ",")
md["Host"] = r.Host
md["RequestURI"] = r.RequestURI
ctx = metadata.NewIncomingContext(ctx, md)
defer r.Body.Close()
path := r.URL.Path
if !strings.HasPrefix(path, "/") {
h.errorHandler(ctx, nil, w, r, fmt.Errorf("path must starts with /"), http.StatusBadRequest)
return
}
matches := make(map[string]interface{})
var match bool
var hldr *patHandler
var handler *httpHandler
for _, shdlr := range h.handlers {
hdlr := shdlr.(*httpHandler)
fh, mp, err := hdlr.handlers.Search(r.Method, path)
if err == nil {
match = true
for k, v := range mp {
matches[k] = v
}
hldr = fh.(*patHandler)
handler = hdlr
break
} else if err == rhttp.ErrMethodNotAllowed && !h.registerRPC {
h.errorHandler(ctx, nil, w, r, fmt.Errorf("not matching route found"), http.StatusMethodNotAllowed)
return
}
}
if !match && h.registerRPC {
microMethod, mok := md.Get(metadata.HeaderEndpoint)
if mok {
serviceMethod := strings.Split(microMethod, ".")
if len(serviceMethod) == 2 {
if shdlr, ok := h.handlers[serviceMethod[0]]; ok {
hdlr := shdlr.(*httpHandler)
fh, mp, err := hdlr.handlers.Search(http.MethodPost, "/"+microMethod)
if err == nil {
match = true
for k, v := range mp {
matches[k] = v
}
hldr = fh.(*patHandler)
handler = hdlr
}
}
}
}
}
if !match && h.hd != nil {
if hdlr, ok := h.hd.Handler().(http.Handler); ok {
hdlr.ServeHTTP(w, r)
return
}
} else if !match {
h.errorHandler(ctx, nil, w, r, fmt.Errorf("not matching route found"), http.StatusNotFound)
return
}
// get fields from url values
if len(r.URL.RawQuery) > 0 {
umd, cerr := rflutil.URLMap(r.URL.RawQuery)
if cerr != nil {
h.errorHandler(ctx, handler, w, r, cerr, http.StatusBadRequest)
return
}
for k, v := range umd {
matches[k] = v
}
}
cf, err := h.newCodec(ct)
if err != nil {
h.errorHandler(ctx, nil, w, r, err, http.StatusBadRequest)
return
}
var argv, replyv reflect.Value
// Decode the argument value.
argIsValue := false // if true, need to indirect before calling.
if hldr.mtype.ArgType.Kind() == reflect.Ptr {
argv = reflect.New(hldr.mtype.ArgType.Elem())
} else {
argv = reflect.New(hldr.mtype.ArgType)
argIsValue = true
}
if argIsValue {
argv = argv.Elem()
}
// reply value
replyv = reflect.New(hldr.mtype.ReplyType.Elem())
function := hldr.mtype.method.Func
var returnValues []reflect.Value
buf, err := io.ReadAll(r.Body)
if err != nil && err != io.EOF {
h.errorHandler(ctx, handler, w, r, err, http.StatusInternalServerError)
return
}
if err = cf.Unmarshal(buf, argv.Interface()); err != nil {
h.errorHandler(ctx, handler, w, r, err, http.StatusBadRequest)
return
}
matches = rflutil.FlattenMap(matches)
if err = rflutil.Merge(argv.Interface(), matches, rflutil.SliceAppend(true), rflutil.Tags([]string{"protobuf", "json"})); err != nil {
h.errorHandler(ctx, handler, w, r, err, http.StatusBadRequest)
return
}
hr := &rpcRequest{
codec: cf,
service: handler.sopts.Name,
contentType: ct,
method: fmt.Sprintf("%s.%s", hldr.name, hldr.mtype.method.Name),
endpoint: fmt.Sprintf("%s.%s", hldr.name, hldr.mtype.method.Name),
payload: argv.Interface(),
header: md,
}
// define the handler func
fn := func(fctx context.Context, req server.Request, rsp interface{}) (err error) {
returnValues = function.Call([]reflect.Value{hldr.rcvr, hldr.mtype.prepareContext(fctx), argv, reflect.ValueOf(rsp)})
// The return value for the method is an error.
if rerr := returnValues[0].Interface(); rerr != nil {
err = rerr.(error)
}
md, ok := metadata.FromOutgoingContext(ctx)
if !ok {
md = metadata.New(0)
}
if nmd, ok := metadata.FromOutgoingContext(fctx); ok {
for k, v := range nmd {
md.Set(k, v)
}
}
metadata.SetOutgoingContext(ctx, md)
return err
}
// wrap the handler func
for i := len(handler.sopts.HdlrWrappers); i > 0; i-- {
fn = handler.sopts.HdlrWrappers[i-1](fn)
}
if ct == "application/x-www-form-urlencoded" {
cf, err = h.newCodec(DefaultContentType)
if err != nil {
h.errorHandler(ctx, handler, w, r, err, http.StatusInternalServerError)
return
}
ct = DefaultContentType
}
scode := int(200)
appErr := fn(ctx, hr, replyv.Interface())
w.Header().Set(metadata.HeaderContentType, ct)
if md, ok := metadata.FromOutgoingContext(ctx); ok {
for k, v := range md {
w.Header().Set(k, v)
}
}
if md := getRspHeader(ctx); md != nil {
for k, v := range md {
for _, vv := range v {
w.Header().Add(k, vv)
}
}
}
if nct := w.Header().Get(metadata.HeaderContentType); nct != ct {
if cf, err = h.newCodec(nct); err != nil {
h.errorHandler(ctx, nil, w, r, err, http.StatusBadRequest)
return
}
}
if appErr != nil {
switch verr := appErr.(type) {
case *errors.Error:
scode = int(verr.Code)
buf, err = cf.Marshal(verr)
case *Error:
buf, err = cf.Marshal(verr.err)
default:
buf, err = cf.Marshal(appErr)
}
} else {
buf, err = cf.Marshal(replyv.Interface())
}
if err != nil && handler.sopts.Logger.V(logger.ErrorLevel) {
handler.sopts.Logger.Errorf(handler.sopts.Context, "handler err: %v", err)
return
}
if nscode := GetRspCode(ctx); nscode != 0 {
scode = nscode
}
w.WriteHeader(scode)
if _, cerr := w.Write(buf); cerr != nil {
handler.sopts.Logger.Errorf(ctx, "write failed: %v", cerr)
}
}