/
request.go
419 lines (368 loc) · 10 KB
/
request.go
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package jsoffnet
import (
"context"
"github.com/pkg/errors"
log "github.com/sirupsen/logrus"
"github.com/superisaac/jsoff"
"github.com/superisaac/jsoff/schema"
"net/http"
)
const (
TransportHTTP = "http"
TransportWebsocket = "websocket"
TransportHTTP2 = "http2"
TransportTCP = "tcp"
TransportVsock = "vsock"
)
type RPCSession interface {
Context() context.Context
Send(msg jsoff.Message)
SessionID() string
}
// http rpc quest structure
type RPCRequest struct {
context context.Context
msg jsoff.Message
transportType string
r *http.Request
data interface{} // arbitrary data
session RPCSession
}
func NewRPCRequest(ctx context.Context, msg jsoff.Message, transportType string) *RPCRequest {
return &RPCRequest{
context: ctx,
msg: msg,
transportType: transportType,
}
}
func (self *RPCRequest) WithSession(session RPCSession) *RPCRequest {
self.session = session
return self
}
func (self *RPCRequest) WithHTTPRequest(r *http.Request) *RPCRequest {
self.r = r
return self
}
func (self RPCRequest) Context() context.Context {
return self.context
}
func (self RPCRequest) Msg() jsoff.Message {
return self.msg
}
func (self RPCRequest) Session() RPCSession {
return self.session
}
func (self RPCRequest) HttpRequest() *http.Request {
if self.r == nil {
panic("Http Request is nil")
}
return self.r
}
func (self RPCRequest) Data() interface{} {
return self.data
}
func (self RPCRequest) Log() *log.Entry {
remoteAddr := ""
if self.r != nil {
remoteAddr = self.r.RemoteAddr
}
return self.msg.Log().WithFields(log.Fields{
"ttype": self.transportType,
"remoteAddr": remoteAddr,
})
}
// handler func
type RequestCallback func(req *RPCRequest, params []interface{}) (interface{}, error)
type ContextedMsgCallback func(ctx context.Context, params []interface{}) (interface{}, error)
type MsgCallback func(params []interface{}) (interface{}, error)
type MissingCallback func(req *RPCRequest) (interface{}, error)
// type CloseCallback func(r *http.Request, session RPCSession)
type CloseCallback func(session RPCSession)
// With method handler
type MethodHandler struct {
callback RequestCallback
schema jsoffschema.Schema
}
type HandlerSetter func(h *MethodHandler)
func WithSchema(s jsoffschema.Schema) HandlerSetter {
return func(h *MethodHandler) {
h.schema = s
}
}
func WithSchemaYaml(yamlSchema string) HandlerSetter {
builder := jsoffschema.NewSchemaBuilder()
s, err := builder.BuildYamlBytes([]byte(yamlSchema))
if err != nil {
panic(err)
}
return WithSchema(s)
}
func WithSchemaJson(jsonSchema string) HandlerSetter {
builder := jsoffschema.NewSchemaBuilder()
s, err := builder.BuildBytes([]byte(jsonSchema))
if err != nil {
panic(err)
}
return WithSchema(s)
}
type Actor struct {
ValidateSchema bool
RecoverFromPanic bool
methodHandlers map[string]*MethodHandler
missingHandler MissingCallback
closeHandler CloseCallback
children []*Actor
}
func NewActor() *Actor {
return &Actor{
ValidateSchema: true,
RecoverFromPanic: true,
methodHandlers: make(map[string]*MethodHandler),
children: make([]*Actor, 0),
}
}
func (self *Actor) AddChild(child *Actor) {
self.children = append(self.children, child)
}
// register a method handler
func (self *Actor) On(method string, callback MsgCallback, setters ...HandlerSetter) {
reqcb := func(req *RPCRequest, params []interface{}) (interface{}, error) {
return callback(params)
}
err := self.OnRequest(method, reqcb, setters...)
if err != nil {
panic(err)
}
}
func (self *Actor) OnContext(method string, callback ContextedMsgCallback, setters ...HandlerSetter) {
reqcb := func(req *RPCRequest, params []interface{}) (interface{}, error) {
return callback(req.Context(), params)
}
err := self.OnRequest(method, reqcb, setters...)
if err != nil {
panic(err)
}
}
func (self *Actor) OnRequest(method string, callback RequestCallback, setters ...HandlerSetter) error {
if _, exist := self.methodHandlers[method]; exist {
return errors.New("handler already exist!")
}
h := &MethodHandler{
callback: callback,
}
for _, setter := range setters {
setter(h)
}
self.methodHandlers[method] = h
return nil
}
// register a typed method handler
func (self *Actor) OnTyped(method string, typedHandler interface{}, setters ...HandlerSetter) {
handler, err := wrapTyped(typedHandler, nil)
if err != nil {
panic(err)
}
err = self.OnRequest(method, handler, setters...)
if err != nil {
panic(err)
}
}
func (self *Actor) OnTypedRequest(method string, typedHandler interface{}, setters ...HandlerSetter) error {
//firstArg := reflect.TypeOf(&RPCRequest{})
handler, err := wrapTyped(typedHandler, &ReqSpec{})
if err != nil {
return err
}
return self.OnRequest(method, handler, setters...)
}
func (self *Actor) OnTypedContext(method string, typedHandler interface{}, setters ...HandlerSetter) error {
//firstArgSpec := reflect.TypeOf((*context.Context)(nil)).Elem()
handler, err := wrapTyped(typedHandler, &ContextSpec{})
if err != nil {
return err
}
return self.OnRequest(method, handler, setters...)
}
// Off unregister the method from handlers
func (self *Actor) Off(method string) {
delete(self.methodHandlers, method)
}
// register a callback called when no hander to handle a request
// message or non-request message met
func (self *Actor) OnMissing(handler MissingCallback) error {
if self.missingHandler != nil {
return errors.New("missing handler already exist!")
}
self.missingHandler = handler
return nil
}
// OnClose handler is called when the stream beneath the actor is closed
func (self *Actor) OnClose(handler CloseCallback) error {
if self.closeHandler != nil {
return errors.New("close handler already exist!")
}
self.closeHandler = handler
return nil
}
// call the close handler if possible
func (self *Actor) HandleClose(session RPCSession) {
// each child have to be called
for _, child := range self.children {
child.HandleClose(session)
}
if self.closeHandler != nil {
self.closeHandler(session)
}
}
// returns there is a handler for a method
func (self Actor) Has(method string) bool {
if _, exist := self.methodHandlers[method]; exist {
return true
}
for _, child := range self.children {
if child.Has(method) {
return true
}
}
return false
}
func (self Actor) MethodList() []string {
methods := []string{}
for mname := range self.methodHandlers {
methods = append(methods, mname)
}
for _, child := range self.children {
childMethods := child.MethodList()
methods = append(methods, childMethods...)
}
return methods
}
// get the schema of a method
func (self Actor) GetSchema(method string) (jsoffschema.Schema, bool) {
if h, ok := self.getHandler(method); ok && h.schema != nil {
return h.schema, true
}
for _, child := range self.children {
if s, ok := child.GetSchema(method); ok {
return s, ok
}
}
return nil, false
}
// get the handler of a method
func (self *Actor) getHandler(method string) (*MethodHandler, bool) {
if h, ok := self.methodHandlers[method]; ok {
return h, true
} else {
return nil, false
}
}
// give the actor a request message
func (self *Actor) Feed(req *RPCRequest) (jsoff.Message, error) {
msg := req.Msg()
if !msg.IsResponse() {
if self.missingHandler != nil {
res, err := self.missingHandler(req)
return self.wrapResult(res, err, msg)
} else {
req.Log().Info("no handler to handle this message")
return nil, nil
}
}
// TODO: recover from panic
if handler, found := self.getHandler(msg.MustMethod()); found {
params := msg.MustParams()
if handler.schema != nil && self.ValidateSchema {
// validate the request
validator := jsoffschema.NewSchemaValidator()
m, err := jsoff.MessageMap(msg)
if err != nil {
return nil, err
}
errPos := validator.Validate(handler.schema, m)
if errPos != nil {
if reqmsg, ok := msg.(*jsoff.RequestMessage); ok {
return errPos.ToMessage(reqmsg), nil
}
return nil, errPos
}
}
return self.recoverCallHandler(handler, req, params)
} else {
for _, child := range self.children {
if child.Has(msg.MustMethod()) {
return child.Feed(req)
}
}
if self.missingHandler != nil {
return self.recoverCallMissingHandler(req)
} else {
if msg.IsRequest() {
return jsoff.ErrMethodNotFound.ToMessageFromId(
msg.MustId(), msg.TraceId()), nil
}
}
}
return nil, nil
}
func (self Actor) recoverCallHandler(handler *MethodHandler, req *RPCRequest, params []interface{}) (resmsg0 jsoff.Message, err0 error) {
if self.RecoverFromPanic {
defer func() {
if r := recover(); r != nil {
if err, ok := r.(error); ok {
resmsg0, err0 = self.wrapResult(nil, err, req.Msg())
} else {
panic(r)
}
}
}()
}
res, err := handler.callback(req, params)
return self.wrapResult(res, err, req.Msg())
}
func (self Actor) recoverCallMissingHandler(req *RPCRequest) (resmsg0 jsoff.Message, err0 error) {
if self.RecoverFromPanic {
defer func() {
if r := recover(); r != nil {
if err, ok := r.(error); ok {
resmsg0, err0 = self.wrapResult(nil, err, req.Msg())
} else {
// rethrown the panic result
panic(r)
}
}
}()
}
res, err := self.missingHandler(req)
return self.wrapResult(res, err, req.Msg())
}
func (self Actor) wrapResult(res interface{}, err error, msg jsoff.Message) (jsoff.Message, error) {
if !msg.IsRequest() {
if err != nil {
msg.Log().Errorf("wrapResult(), error handleing res, %#v", err)
}
return nil, err
}
reqmsg, ok := msg.(*jsoff.RequestMessage)
if !ok {
msg.Log().Panicf("convert to request message failed")
return nil, err
}
if err != nil {
var rpcErr *jsoff.RPCError
var wrapErr *WrappedResponse
if errors.As(err, &rpcErr) {
return rpcErr.ToMessage(reqmsg), nil
} else if errors.As(err, &wrapErr) {
return nil, wrapErr
} else {
msg.Log().Errorf("wrapResult(), error handling err %#v", err)
return jsoff.ErrInternalError.ToMessage(reqmsg), nil
}
} else if resmsg1, ok := res.(jsoff.Message); ok {
// normal response
return resmsg1, nil
} else {
return jsoff.NewResultMessage(reqmsg, res), nil
}
}