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fully working micro http server implementation

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Signed-off-by: Vasiliy Tolstov <v.tolstov@unistack.org>
This commit is contained in:
Василий Толстов 2021-02-05 18:31:51 +03:00
parent 74d8cb8538
commit 3ec25548a8
6 changed files with 476 additions and 18 deletions
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2
go.mod
View File

@ -3,7 +3,7 @@ module github.com/unistack-org/micro-server-http/v3
go 1.13
require (
github.com/unistack-org/micro/v3 v3.2.0
github.com/unistack-org/micro/v3 v3.2.7
golang.org/x/net v0.0.0-20201224014010-6772e930b67b
)

4
go.sum
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@ -57,8 +57,8 @@ github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+
github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=
github.com/stretchr/testify v1.7.0 h1:nwc3DEeHmmLAfoZucVR881uASk0Mfjw8xYJ99tb5CcY=
github.com/stretchr/testify v1.7.0/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
github.com/unistack-org/micro/v3 v3.2.0 h1:1e6cFMHzHV+RjwwajwYJARpxQiEpnTCvV/2L9xeW4zc=
github.com/unistack-org/micro/v3 v3.2.0/go.mod h1:J8XxJj4Pqa3Ee0a4biRRtut7UwTlfBq8QRe+s4PKGS0=
github.com/unistack-org/micro/v3 v3.2.7 h1:+vLVmoQeE0z0cmIAKXSQXbxC4pxXpmkzckh9B9shogo=
github.com/unistack-org/micro/v3 v3.2.7/go.mod h1:J8XxJj4Pqa3Ee0a4biRRtut7UwTlfBq8QRe+s4PKGS0=
golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
golang.org/x/crypto v0.0.0-20191011191535-87dc89f01550/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
golang.org/x/crypto v0.0.0-20201221181555-eec23a3978ad/go.mod h1:jdWPYTVW3xRLrWPugEBEK3UY2ZEsg3UU495nc5E+M+I=

193
handler.go
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@ -1,18 +1,56 @@
package http
import (
"context"
"fmt"
"net/http"
"reflect"
"strings"
"github.com/unistack-org/micro/v3/codec"
"github.com/unistack-org/micro/v3/logger"
"github.com/unistack-org/micro/v3/metadata"
"github.com/unistack-org/micro/v3/register"
"github.com/unistack-org/micro/v3/server"
"github.com/unistack-org/micro/v3/util/qson"
rflutil "github.com/unistack-org/micro/v3/util/reflect"
rutil "github.com/unistack-org/micro/v3/util/router"
)
var (
DefaultErrorHandler = func(ctx context.Context, s server.Handler, w http.ResponseWriter, r *http.Request, err error, status int) {
w.WriteHeader(status)
w.Write([]byte(err.Error()))
}
DefaultContentType = "application/json"
)
type patHandler struct {
pat rutil.Pattern
mtype *methodType
name string
rcvr reflect.Value
}
type httpHandler struct {
name string
opts server.HandlerOptions
sopts server.Options
eps []*register.Endpoint
hd interface{}
handlers map[string][]patHandler
errorHandler func(context.Context, server.Handler, http.ResponseWriter, *http.Request, error, int)
}
func (h *httpHandler) newCodec(ct string) (codec.Codec, error) {
if cf, ok := h.sopts.Codecs[ct]; ok {
return cf, nil
}
return nil, codec.ErrUnknownContentType
}
func (h *httpHandler) Name() string {
return "handler"
return h.name
}
func (h *httpHandler) Handler() interface{} {
@ -26,3 +64,156 @@ func (h *httpHandler) Endpoints() []*register.Endpoint {
func (h *httpHandler) Options() server.HandlerOptions {
return h.opts
}
func (h *httpHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
ctx := r.Context()
path := r.URL.Path
if !strings.HasPrefix(path, "/") {
h.errorHandler(ctx, h, w, r, fmt.Errorf("path must contains /"), http.StatusBadRequest)
}
ct := DefaultContentType
if htype := r.Header.Get("Content-Type"); htype != "" {
ct = htype
}
cf, err := h.newCodec(ct)
if err != nil {
h.errorHandler(ctx, h, w, r, err, http.StatusBadRequest)
}
components := strings.Split(path[1:], "/")
l := len(components)
var verb string
idx := strings.LastIndex(components[l-1], ":")
if idx == 0 {
h.errorHandler(ctx, h, w, r, fmt.Errorf("not found"), http.StatusNotFound)
return
}
if idx > 0 {
c := components[l-1]
components[l-1], verb = c[:idx], c[idx+1:]
}
matches := make(map[string]interface{})
var match bool
var hldr patHandler
for _, hldr = range h.handlers[r.Method] {
mp, err := hldr.pat.Match(components, verb)
if err == nil {
match = true
for k, v := range mp {
matches[k] = v
}
break
}
}
if !match {
h.errorHandler(ctx, h, w, r, fmt.Errorf("not matching route found"), http.StatusNotFound)
return
}
md, ok := metadata.FromContext(ctx)
if !ok {
md = metadata.New(0)
}
for k, v := range r.Header {
md.Set(k, strings.Join(v, ", "))
}
// get fields from url values
if len(r.URL.RawQuery) > 0 {
umd := make(map[string]interface{})
err = qson.Unmarshal(&umd, r.URL.RawQuery)
if err != nil {
h.errorHandler(ctx, h, w, r, err, http.StatusBadRequest)
}
for k, v := range umd {
matches[k] = v
}
}
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
//function := hldr.rcvr
var returnValues []reflect.Value
if err = rflutil.MergeMap(argv.Interface(), matches); err != nil {
h.errorHandler(ctx, h, w, r, err, http.StatusBadRequest)
return
}
b, err := cf.Marshal(argv.Interface())
if err != nil {
h.errorHandler(ctx, h, w, r, err, http.StatusBadRequest)
return
}
hr := &rpcRequest{
codec: cf,
service: h.sopts.Name,
contentType: ct,
method: fmt.Sprintf("%s.%s", hldr.name, hldr.mtype.method.Name),
body: b,
payload: argv.Interface(),
}
var scode int
// define the handler func
fn := func(ctx context.Context, req server.Request, rsp interface{}) (err error) {
ctx = context.WithValue(ctx, rspCodeKey{}, &rspCodeVal{})
ctx = metadata.NewContext(ctx, md)
returnValues = function.Call([]reflect.Value{hldr.rcvr, hldr.mtype.prepareContext(ctx), reflect.ValueOf(argv.Interface()), reflect.ValueOf(rsp)})
scode = GetRspCode(ctx)
// The return value for the method is an error.
if rerr := returnValues[0].Interface(); rerr != nil {
err = rerr.(error)
}
return err
}
// wrap the handler func
for i := len(h.sopts.HdlrWrappers); i > 0; i-- {
fn = h.sopts.HdlrWrappers[i-1](fn)
}
if appErr := fn(ctx, hr, replyv.Interface()); appErr != nil {
b, err = cf.Marshal(appErr)
} else {
b, err = cf.Marshal(replyv.Interface())
}
if err != nil && h.sopts.Logger.V(logger.ErrorLevel) {
h.sopts.Logger.Errorf(h.sopts.Context, "XXXXX: %v", err)
return
}
w.Header().Set("content-Type", ct)
if scode != 0 {
w.WriteHeader(scode)
} else {
h.sopts.Logger.Warn(h.sopts.Context, "response code not set in handler via SetRspCode(ctx, http.StatusXXX)")
}
w.Write(b)
}

82
http.go
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@ -7,7 +7,9 @@ import (
"fmt"
"net"
"net/http"
"reflect"
"sort"
"strings"
"sync"
"time"
@ -16,6 +18,7 @@ import (
"github.com/unistack-org/micro/v3/logger"
"github.com/unistack-org/micro/v3/register"
"github.com/unistack-org/micro/v3/server"
rutil "github.com/unistack-org/micro/v3/util/router"
"golang.org/x/net/netutil"
)
@ -55,9 +58,6 @@ func (h *httpServer) Init(opts ...server.Option) error {
}
func (h *httpServer) Handle(handler server.Handler) error {
if _, ok := handler.Handler().(http.Handler); !ok {
return errors.New("Handle requires http.Handler")
}
h.Lock()
h.hd = handler
h.Unlock()
@ -78,11 +78,77 @@ func (h *httpServer) NewHandler(handler interface{}, opts ...server.HandlerOptio
}
}
return &httpHandler{
hdlr := &httpHandler{
eps: eps,
hd: handler,
opts: options,
sopts: h.opts,
}
tp := reflect.TypeOf(handler)
/*
for m := 0; m < tp.NumMethod(); m++ {
if e := register.ExtractEndpoint(tp.Method(m)); e != nil {
e.Name = name + "." + e.Name
for k, v := range options.Metadata[e.Name] {
e.Metadata[k] = v
}
eps = append(eps, e)
}
}
*/
hdlr.handlers = make(map[string][]patHandler)
for hn, md := range options.Metadata {
cmp, err := rutil.Parse(md["Path"])
if err != nil && h.opts.Logger.V(logger.ErrorLevel) {
h.opts.Logger.Errorf(h.opts.Context, "parsing path pattern err: %v", err)
continue
}
tpl := cmp.Compile()
pat, err := rutil.NewPattern(tpl.Version, tpl.OpCodes, tpl.Pool, tpl.Verb)
if err != nil && h.opts.Logger.V(logger.ErrorLevel) {
h.opts.Logger.Errorf(h.opts.Context, "creating new pattern err: %v", err)
continue
}
var method reflect.Method
mname := hn[strings.Index(hn, ".")+1:]
for m := 0; m < tp.NumMethod(); m++ {
mn := tp.Method(m)
if mn.Name != mname {
continue
}
method = mn
break
}
if method.Name == "" && h.opts.Logger.V(logger.ErrorLevel) {
h.opts.Logger.Errorf(h.opts.Context, "nil method for %s", mname)
continue
}
mtype, err := prepareEndpoint(method)
if err != nil && h.opts.Logger.V(logger.ErrorLevel) {
h.opts.Logger.Errorf(h.opts.Context, "%v", err)
continue
} else if mtype == nil {
continue
}
rcvr := reflect.ValueOf(handler)
name := reflect.Indirect(rcvr).Type().Name()
pth := patHandler{pat: pat, mtype: mtype, name: name, rcvr: rcvr}
hdlr.name = name
hdlr.handlers[md["Method"]] = append(hdlr.handlers[md["Method"]], pth)
}
return hdlr
}
func (h *httpServer) NewSubscriber(topic string, handler interface{}, opts ...server.SubscriberOption) server.Subscriber {
@ -254,10 +320,6 @@ func (h *httpServer) Start() error {
hd := h.hd
h.RUnlock()
if hd == nil {
return errors.New("Server required http.Handler")
}
// micro: config.Transport.Listen(config.Address)
var ts net.Listener
@ -291,6 +353,10 @@ func (h *httpServer) Start() error {
h.Unlock()
handler, ok := hd.Handler().(http.Handler)
if !ok {
handler, ok = hd.(http.Handler)
}
if !ok {
return errors.New("Server required http.Handler")
}

95
request.go Normal file
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@ -0,0 +1,95 @@
package http
import (
"io"
"github.com/unistack-org/micro/v3/codec"
"github.com/unistack-org/micro/v3/metadata"
)
type rpcRequest struct {
rw io.ReadWriter
service string
method string
endpoint string
target string
contentType string
codec codec.Codec
header metadata.Metadata
body []byte
stream bool
payload interface{}
}
type rpcMessage struct {
topic string
contentType string
payload interface{}
header metadata.Metadata
body []byte
codec codec.Codec
}
func (r *rpcRequest) ContentType() string {
return r.contentType
}
func (r *rpcRequest) Service() string {
return r.service
}
func (r *rpcRequest) Method() string {
return r.method
}
func (r *rpcRequest) Endpoint() string {
return r.method
}
func (r *rpcRequest) Codec() codec.Codec {
return r.codec
}
func (r *rpcRequest) Header() metadata.Metadata {
return r.header
}
func (r *rpcRequest) Read() ([]byte, error) {
f := &codec.Frame{}
if err := r.codec.ReadBody(r.rw, f); err != nil {
return nil, err
}
return f.Data, nil
}
func (r *rpcRequest) Stream() bool {
return r.stream
}
func (r *rpcRequest) Body() interface{} {
return r.payload
}
func (r *rpcMessage) ContentType() string {
return r.contentType
}
func (r *rpcMessage) Topic() string {
return r.topic
}
func (r *rpcMessage) Payload() interface{} {
return r.payload
}
func (r *rpcMessage) Header() metadata.Metadata {
return r.header
}
func (r *rpcMessage) Body() []byte {
return r.body
}
func (r *rpcMessage) Codec() codec.Codec {
return r.codec
}

106
server.go Normal file
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@ -0,0 +1,106 @@
package http
import (
"context"
"fmt"
"reflect"
"unicode"
"unicode/utf8"
"github.com/unistack-org/micro/v3/server"
)
type methodType struct {
method reflect.Method
ArgType reflect.Type
ReplyType reflect.Type
ContextType reflect.Type
stream bool
}
// Is this an exported - upper case - name?
func isExported(name string) bool {
r, _ := utf8.DecodeRuneInString(name)
return unicode.IsUpper(r)
}
// Is this type exported or a builtin?
func isExportedOrBuiltinType(t reflect.Type) bool {
for t.Kind() == reflect.Ptr {
t = t.Elem()
}
// PkgPath will be non-empty even for an exported type,
// so we need to check the type name as well.
return isExported(t.Name()) || t.PkgPath() == ""
}
// prepareEndpoint() returns a methodType for the provided method or nil
// in case if the method was unsuitable.
func prepareEndpoint(method reflect.Method) (*methodType, error) {
mtype := method.Type
mname := method.Name
var replyType, argType, contextType reflect.Type
var stream bool
// Endpoint() must be exported.
if method.PkgPath != "" {
return nil, fmt.Errorf("Endpoint must be exported")
}
switch mtype.NumIn() {
case 3:
// assuming streaming
argType = mtype.In(2)
contextType = mtype.In(1)
stream = true
case 4:
// method that takes a context
argType = mtype.In(2)
replyType = mtype.In(3)
contextType = mtype.In(1)
default:
return nil, fmt.Errorf("method %v of %v has wrong number of ins: %v", mname, mtype, mtype.NumIn())
}
if stream {
// check stream type
streamType := reflect.TypeOf((*server.Stream)(nil)).Elem()
if !argType.Implements(streamType) {
return nil, fmt.Errorf("%v argument does not implement Streamer interface: %v", mname, argType)
}
} else {
// if not stream check the replyType
// First arg need not be a pointer.
if !isExportedOrBuiltinType(argType) {
return nil, fmt.Errorf("%v argument type not exported: %v", mname, argType)
}
if replyType.Kind() != reflect.Ptr {
return nil, fmt.Errorf("method %v reply type not a pointer: %v", mname, replyType)
}
// Reply type must be exported.
if !isExportedOrBuiltinType(replyType) {
return nil, fmt.Errorf("method %v reply type not exported: %v", mname, replyType)
}
}
// Endpoint() needs one out.
if mtype.NumOut() != 1 {
return nil, fmt.Errorf("method %v has wrong number of outs: %v", mname, mtype.NumOut())
}
// The return type of the method must be error.
if returnType := mtype.Out(0); returnType != typeOfError {
return nil, fmt.Errorf("method %v returns %v not error", mname, returnType.String())
}
return &methodType{method: method, ArgType: argType, ReplyType: replyType, ContextType: contextType, stream: stream}, nil
}
func (m *methodType) prepareContext(ctx context.Context) reflect.Value {
if contextv := reflect.ValueOf(ctx); contextv.IsValid() {
return contextv
}
return reflect.Zero(m.ContextType)
}