commons_go/rpc
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This commit is contained in:
crusader 2017-11-29 01:19:03 +09:00
parent 942a854fe1
commit 6aa5c1536d
24 changed files with 309 additions and 673 deletions
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27
client/client.go
View File

@ -303,7 +303,7 @@ func (c *client) rpcReader(readerDone chan<- error) {
}() }()
for { for {
msg, err := c.ch.GetCodec().NewMessage(c.conn) resCodec, err := c.ch.GetCodec().NewResponse(c.conn)
if nil != err { if nil != err {
if err == io.ErrUnexpectedEOF || err == io.EOF { if err == io.ErrUnexpectedEOF || err == io.EOF {
logging.Logger().Info("Client: disconnected from server") logging.Logger().Info("Client: disconnected from server")
@ -314,12 +314,10 @@ func (c *client) rpcReader(readerDone chan<- error) {
continue continue
} }
switch msg.MessageType() { if nil != resCodec.ID() {
case protocol.MessageTypeResponse: err = c.handleResponse(resCodec)
c.handleResponse(msg) } else {
case protocol.MessageTypeNotification: err = c.handleNotification(resCodec)
c.handleNotification(msg)
default:
} }
if nil != err { if nil != err {
@ -330,14 +328,7 @@ func (c *client) rpcReader(readerDone chan<- error) {
} }
func (c *client) handleResponse(msg protocol.ClientMessageCodec) error { func (c *client) handleResponse(resCodec protocol.ClientResponseCodec) error {
codec, err := msg.MessageCodec()
if nil != err {
return err
}
resCodec := codec.(protocol.ClientResponseCodec)
c.pendingRequestsLock.Lock() c.pendingRequestsLock.Lock()
id := reflect.ValueOf(resCodec.ID()).Convert(uint64Type).Uint() id := reflect.ValueOf(resCodec.ID()).Convert(uint64Type).Uint()
@ -369,14 +360,12 @@ func (c *client) handleResponse(msg protocol.ClientMessageCodec) error {
return nil return nil
} }
func (c *client) handleNotification(msg protocol.ClientMessageCodec) error { func (c *client) handleNotification(resCodec protocol.ClientResponseCodec) error {
codec, err := msg.MessageCodec() notiCodec, err := resCodec.Notification()
if nil != err { if nil != err {
return err return err
} }
notiCodec := codec.(protocol.ClientNotificationCodec)
_, err = c.ch.GetRPCRegistry().Invoke(notiCodec) _, err = c.ch.GetRPCRegistry().Invoke(notiCodec)
return err return err

6
connection/socket/servlet_handlers.go
View File

@ -10,14 +10,14 @@ import (
type ServletHandlers struct { type ServletHandlers struct {
} }
func (sh *ServletHandlers) GetRequest(servletCTX rpc.ServletContext, codec protocol.ServerCodec, conn interface{}) (protocol.ServerRequestCodec, error) { func (sh *ServletHandlers) ReadRequest(servletCTX rpc.RPCServletContext, codec protocol.ServerCodec, conn interface{}) (protocol.ServerRequestCodec, error) {
nConn := conn.(net.Conn) nConn := conn.(net.Conn)
requestCodec, err := codec.NewRequest(nConn) requestCodec, err := codec.NewRequest(nConn)
return requestCodec, err return requestCodec, err
} }
func (sh *ServletHandlers) SendResponse(servletCTX rpc.ServletContext, conn interface{}, requestCodec protocol.ServerRequestCodec, result interface{}, err error) error { func (sh *ServletHandlers) WriteResponse(servletCTX rpc.RPCServletContext, conn interface{}, requestCodec protocol.ServerRequestCodec, result interface{}, err error) error {
nConn := conn.(net.Conn) nConn := conn.(net.Conn)
if nil != err { if nil != err {
@ -33,7 +33,7 @@ func (sh *ServletHandlers) SendResponse(servletCTX rpc.ServletContext, conn inte
return nil return nil
} }
func (sh *ServletHandlers) SendNotification(servletCTX rpc.ServletContext, conn interface{}, codec protocol.ServerCodec, method string, args ...interface{}) error { func (sh *ServletHandlers) WriteNotification(servletCTX rpc.RPCServletContext, conn interface{}, codec protocol.ServerCodec, method string, args []interface{}) error {
nConn := conn.(net.Conn) nConn := conn.(net.Conn)
if wErr := codec.WriteNotification(nConn, method, args); nil != wErr { if wErr := codec.WriteNotification(nConn, method, args); nil != wErr {

9
connection/websocket/fasthttp/servlet_handlers.go
View File

@ -1,17 +1,16 @@
package fasthttp package fasthttp
import ( import (
"github.com/gorilla/websocket"
"git.loafle.net/commons_go/rpc" "git.loafle.net/commons_go/rpc"
"git.loafle.net/commons_go/rpc/protocol" "git.loafle.net/commons_go/rpc/protocol"
cwf "git.loafle.net/commons_go/websocket_fasthttp" cwf "git.loafle.net/commons_go/websocket_fasthttp"
"git.loafle.net/commons_go/websocket_fasthttp/websocket"
) )
type ServletHandlers struct { type ServletHandlers struct {
} }
func (sh *ServletHandlers) GetRequest(servletCTX rpc.ServletContext, codec protocol.ServerCodec, conn interface{}) (protocol.ServerRequestCodec, error) { func (sh *ServletHandlers) ReadRequest(servletCTX rpc.RPCServletContext, codec protocol.ServerCodec, conn interface{}) (protocol.ServerRequestCodec, error) {
soc := conn.(cwf.Socket) soc := conn.(cwf.Socket)
_, r, err := soc.NextReader() _, r, err := soc.NextReader()
@ -20,7 +19,7 @@ func (sh *ServletHandlers) GetRequest(servletCTX rpc.ServletContext, codec proto
return requestCodec, err return requestCodec, err
} }
func (sh *ServletHandlers) SendResponse(servletCTX rpc.ServletContext, conn interface{}, requestCodec protocol.ServerRequestCodec, result interface{}, err error) error { func (sh *ServletHandlers) WriteResponse(servletCTX rpc.RPCServletContext, conn interface{}, requestCodec protocol.ServerRequestCodec, result interface{}, err error) error {
soc := conn.(cwf.Socket) soc := conn.(cwf.Socket)
wc, wErr := soc.NextWriter(websocket.TextMessage) wc, wErr := soc.NextWriter(websocket.TextMessage)
@ -41,7 +40,7 @@ func (sh *ServletHandlers) SendResponse(servletCTX rpc.ServletContext, conn inte
return nil return nil
} }
func (sh *ServletHandlers) SendNotification(servletCTX rpc.ServletContext, conn interface{}, codec protocol.ServerCodec, method string, args ...interface{}) error { func (sh *ServletHandlers) WriteNotification(servletCTX rpc.RPCServletContext, conn interface{}, codec protocol.ServerCodec, method string, args []interface{}) error {
soc := conn.(cwf.Socket) soc := conn.(cwf.Socket)
wc, wErr := soc.NextWriter(websocket.TextMessage) wc, wErr := soc.NextWriter(websocket.TextMessage)

2
constants.go
View File

@ -3,7 +3,7 @@ package rpc
import cuc "git.loafle.net/commons_go/util/context" import cuc "git.loafle.net/commons_go/util/context"
const ( const (
DefaultPendingMessages = 32 * 1024 DefaultPendingResponses = 32 * 1024
) )
var ( var (

27
protocol/client_codec.go
View File

@ -4,40 +4,17 @@ import (
"io" "io"
) )
type MessageType int
const (
MessageTypeUnknown MessageType = iota
MessageTypeRequest
MessageTypeResponse
MessageTypeNotification
)
// ClientCodec creates a ClientCodecRequest to process each request. // ClientCodec creates a ClientCodecRequest to process each request.
type ClientCodec interface { type ClientCodec interface {
WriteRequest(w io.Writer, method string, args interface{}, id interface{}) error WriteRequest(w io.Writer, method string, args interface{}, id interface{}) error
NewMessage(rc io.Reader) (ClientMessageCodec, error) NewResponse(rc io.Reader) (ClientResponseCodec, error)
}
type ClientRequestCodec interface {
RegistryCodec
}
// ClientMessageCodec decodes a response or notification using a specific
// serialization scheme.
type ClientMessageCodec interface {
MessageType() MessageType
// Reads the message filling the RPC response or notification.
MessageCodec() (interface{}, error)
Close()
} }
type ClientResponseCodec interface { type ClientResponseCodec interface {
Notification() (ClientNotificationCodec, error)
Result(result interface{}) error Result(result interface{}) error
Error() error Error() error
ID() interface{} ID() interface{}
Close()
} }
type ClientNotificationCodec interface { type ClientNotificationCodec interface {

113
protocol/json/client.go
View File

@ -2,21 +2,12 @@ package json
import ( import (
"encoding/json" "encoding/json"
"fmt"
"io" "io"
"sync"
"git.loafle.net/commons_go/rpc/codec" "git.loafle.net/commons_go/rpc/codec"
"git.loafle.net/commons_go/rpc/protocol" "git.loafle.net/commons_go/rpc/protocol"
) )
// clientMessage represents a JSON-RPC message sent to a client.
type clientMessage struct {
Version string `json:"jsonrpc"`
MessageType protocol.MessageType `json:"messageType"`
Message *json.RawMessage `json:"message"`
}
// ---------------------------------------------------------------------------- // ----------------------------------------------------------------------------
// Codec // Codec
// ---------------------------------------------------------------------------- // ----------------------------------------------------------------------------
@ -37,10 +28,12 @@ type ClientCodec struct {
} }
func (cc *ClientCodec) WriteRequest(w io.Writer, method string, args interface{}, id interface{}) error { func (cc *ClientCodec) WriteRequest(w io.Writer, method string, args interface{}, id interface{}) error {
req := retainClientRequest(method, args, id) req := &clientRequest{
defer func() { Version: Version,
releaseClientRequest(req) Method: method,
}() Params: args,
ID: id,
}
encoder := json.NewEncoder(cc.codecSel.SelectByWriter(w).Encode(w)) encoder := json.NewEncoder(cc.codecSel.SelectByWriter(w).Encode(w))
if err := encoder.Encode(req); nil != err { if err := encoder.Encode(req); nil != err {
@ -51,96 +44,6 @@ func (cc *ClientCodec) WriteRequest(w io.Writer, method string, args interface{}
} }
// NewMessage returns a ClientMessageCodec. // NewMessage returns a ClientMessageCodec.
func (cc *ClientCodec) NewMessage(r io.Reader) (protocol.ClientMessageCodec, error) { func (cc *ClientCodec) NewResponse(r io.Reader) (protocol.ClientResponseCodec, error) {
return newClientMessageCodec(r, cc.codecSel.SelectByReader(r)) return newClientResponseCodec(r, cc.codecSel.SelectByReader(r))
}
// newClientMessageCodec returns a new ClientMessageCodec.
func newClientMessageCodec(r io.Reader, codec codec.Codec) (protocol.ClientMessageCodec, error) {
msg := retainClientMessage()
err := json.NewDecoder(r).Decode(msg)
if err != nil {
if err == io.ErrUnexpectedEOF || err == io.EOF {
return nil, err
}
err = &Error{
Code: E_PARSE,
Message: err.Error(),
Data: msg,
}
}
if msg.Version != Version {
err = &Error{
Code: E_INVALID_REQ,
Message: "jsonrpc must be " + Version,
Data: msg,
}
}
return retainClientMessageCodec(msg, err, codec), nil
}
type ClientMessageCodec struct {
msg *clientMessage
err error
codec codec.Codec
}
func (ccm *ClientMessageCodec) MessageType() protocol.MessageType {
return ccm.msg.MessageType
}
func (ccm *ClientMessageCodec) MessageCodec() (interface{}, error) {
switch ccm.msg.MessageType {
case protocol.MessageTypeResponse:
return newClientResponseCodec(ccm.msg.Message, ccm.codec)
case protocol.MessageTypeNotification:
return newClientNotificationCodec(ccm.msg.Message, ccm.codec)
}
return nil, fmt.Errorf("RPC: Not supported message type[%v]", ccm.msg.MessageType)
}
func (ccm *ClientMessageCodec) Close() {
if nil != ccm.msg {
releaseClientMessage(ccm.msg)
}
releaseClientMessageCodec(ccm)
}
var clientMessagePool sync.Pool
func retainClientMessage() *clientMessage {
v := clientMessagePool.Get()
if v == nil {
return &clientMessage{}
}
return v.(*clientMessage)
}
func releaseClientMessage(cm *clientMessage) {
clientMessagePool.Put(cm)
}
var clientMessageCodecPool sync.Pool
func retainClientMessageCodec(msg *clientMessage, err error, codec codec.Codec) *ClientMessageCodec {
var ccm *ClientMessageCodec
v := clientMessageCodecPool.Get()
if v == nil {
ccm = &ClientMessageCodec{}
} else {
ccm = v.(*ClientMessageCodec)
}
ccm.msg = msg
ccm.err = err
ccm.codec = codec
return ccm
}
func releaseClientMessageCodec(cr *ClientMessageCodec) {
clientMessageCodecPool.Put(cr)
} }

88
protocol/json/client_notification.go
View File

@ -2,10 +2,8 @@ package json
import ( import (
"encoding/json" "encoding/json"
"sync"
"git.loafle.net/commons_go/rpc/codec" "git.loafle.net/commons_go/rpc/codec"
"git.loafle.net/commons_go/rpc/protocol"
) )
// ---------------------------------------------------------------------------- // ----------------------------------------------------------------------------
@ -19,79 +17,61 @@ type clientNotification struct {
Params *json.RawMessage `json:"params,omitempty"` Params *json.RawMessage `json:"params,omitempty"`
} }
// newClientNotificationCodec returns a new ClientNotificationCodec.
func newClientNotificationCodec(raw *json.RawMessage, codec codec.Codec) (protocol.ClientNotificationCodec, error) {
// Decode the request body and check if RPC method is valid.
cnc := retainClientNotificationCodec()
if err := json.Unmarshal(*raw, &cnc.notification); nil != err {
releaseClientNotificationCodec(cnc)
return nil, err
}
return cnc, nil
}
// ClientNotificationCodec decodes and encodes a single notification. // ClientNotificationCodec decodes and encodes a single notification.
type ClientNotificationCodec struct { type ClientNotificationCodec struct {
notification clientNotification noti *clientNotification
err error err error
codec codec.Codec
} }
func (crc *ClientNotificationCodec) Method() string { func (cnc *ClientNotificationCodec) Method() string {
return crc.notification.Method return cnc.noti.Method
} }
func (crc *ClientNotificationCodec) ReadParams(args []interface{}) error { func (cnc *ClientNotificationCodec) ReadParams(args []interface{}) error {
if crc.err == nil && crc.notification.Params != nil { if cnc.err == nil && cnc.noti.Params != nil {
// Note: if scr.request.Params is nil it's not an error, it's an optional member. // Note: if scr.request.Params is nil it's not an error, it's an optional member.
// JSON params structured object. Unmarshal to the args object. // JSON params structured object. Unmarshal to the args object.
if err := json.Unmarshal(*crc.notification.Params, &args); err != nil { raws := make([]json.RawMessage, len(args))
crc.err = &Error{ if err := json.Unmarshal(*cnc.noti.Params, &raws); err != nil {
cnc.err = &Error{
Code: E_INVALID_REQ, Code: E_INVALID_REQ,
Message: err.Error(), Message: err.Error(),
Data: crc.notification.Params, Data: cnc.noti.Params,
} }
} return cnc.err
}
return crc.err
} }
func (crc *ClientNotificationCodec) Params() ([]string, error) { for indexI := 0; indexI < len(args); indexI++ {
if crc.err == nil && crc.notification.Params != nil { raw := raws[indexI]
arg := args[indexI]
if err := json.Unmarshal(raw, &arg); err != nil {
cnc.err = &Error{
Code: E_INVALID_REQ,
Message: err.Error(),
Data: cnc.noti.Params,
}
return cnc.err
}
}
}
return cnc.err
}
func (cnc *ClientNotificationCodec) Params() ([]string, error) {
if cnc.err == nil && cnc.noti.Params != nil {
var results []string var results []string
if err := json.Unmarshal(*crc.notification.Params, &results); err != nil { if err := json.Unmarshal(*cnc.noti.Params, &results); err != nil {
crc.err = &Error{ cnc.err = &Error{
Code: E_INVALID_REQ, Code: E_INVALID_REQ,
Message: err.Error(), Message: err.Error(),
Data: crc.notification.Params, Data: cnc.noti.Params,
} }
return nil, crc.err return nil, cnc.err
} }
return results, nil return results, nil
} }
return nil, crc.err return nil, cnc.err
}
func (crc *ClientNotificationCodec) Close() {
releaseClientNotificationCodec(crc)
}
var clientNotificationCodecPool sync.Pool
func retainClientNotificationCodec() *ClientNotificationCodec {
v := clientNotificationCodecPool.Get()
if v == nil {
return &ClientNotificationCodec{}
}
return v.(*ClientNotificationCodec)
}
func releaseClientNotificationCodec(crc *ClientNotificationCodec) {
crc.notification.Method = ""
crc.notification.Params = nil
clientNotificationCodecPool.Put(crc)
} }

30
protocol/json/client_request.go
View File

@ -1,7 +1,5 @@
package json package json
import "sync"
// ---------------------------------------------------------------------------- // ----------------------------------------------------------------------------
// Request and Response // Request and Response
// ---------------------------------------------------------------------------- // ----------------------------------------------------------------------------
@ -21,31 +19,3 @@ type clientRequest struct {
// response with the request that it is replying to. // response with the request that it is replying to.
ID interface{} `json:"id"` ID interface{} `json:"id"`
} }
var clientRequestPool sync.Pool
func retainClientRequest(method string, params interface{}, id interface{}) *clientRequest {
var cr *clientRequest
v := clientRequestPool.Get()
if v == nil {
cr = &clientRequest{}
} else {
cr = v.(*clientRequest)
}
cr.Version = Version
cr.Method = method
cr.Params = params
cr.ID = id
return cr
}
func releaseClientRequest(cr *clientRequest) {
cr.Version = ""
cr.Method = ""
cr.Params = nil
cr.ID = nil
clientRequestPool.Put(cr)
}

99
protocol/json/client_response.go
View File

@ -3,7 +3,7 @@ package json
import ( import (
"encoding/json" "encoding/json"
"fmt" "fmt"
"sync" "io"
"git.loafle.net/commons_go/rpc/codec" "git.loafle.net/commons_go/rpc/codec"
"git.loafle.net/commons_go/rpc/protocol" "git.loafle.net/commons_go/rpc/protocol"
@ -14,73 +14,76 @@ import (
// ---------------------------------------------------------------------------- // ----------------------------------------------------------------------------
// clientResponse represents a JSON-RPC response returned to a client. // clientResponse represents a JSON-RPC response returned to a client.
type clientResponse struct { type clientResponse struct {
Version string `json:"jsonrpc"`
Result *json.RawMessage `json:"result,omitempty"` Result *json.RawMessage `json:"result,omitempty"`
Error error `json:"error,omitempty"` Error error `json:"error,omitempty"`
ID interface{} `json:"id,omitempty"` ID interface{} `json:"id,omitempty"`
} }
// newClientResponseCodec returns a new ClientResponseCodec.
func newClientResponseCodec(raw *json.RawMessage, codec codec.Codec) (protocol.ClientResponseCodec, error) {
// Decode the request body and check if RPC method is valid.
ccr := retainClientResponseCodec()
err := json.Unmarshal(*raw, &ccr.res)
if err != nil {
releaseClientResponseCodec(ccr)
return nil, err
}
if nil == ccr.res.Result && nil == ccr.res.Error {
releaseClientResponseCodec(ccr)
return nil, fmt.Errorf("This is not Response")
}
return ccr, nil
}
// ClientResponseCodec decodes and encodes a single request. // ClientResponseCodec decodes and encodes a single request.
type ClientResponseCodec struct { type ClientResponseCodec struct {
res clientResponse res *clientResponse
err error err error
codec codec.Codec
} }
func (ccr *ClientResponseCodec) ID() interface{} { func (crc *ClientResponseCodec) ID() interface{} {
return ccr.res.ID return crc.res.ID
} }
func (ccr *ClientResponseCodec) Result(result interface{}) error { func (crc *ClientResponseCodec) Result(result interface{}) error {
if ccr.err == nil && ccr.res.Result != nil { if nil == crc.err && nil != crc.res.Result {
if err := json.Unmarshal(*ccr.res.Result, &result); err != nil { if err := json.Unmarshal(*crc.res.Result, result); nil != err {
params := [1]interface{}{result} crc.err = &Error{
if err = json.Unmarshal(*ccr.res.Result, &params); err != nil { Code: E_PARSE,
ccr.err = err Message: err.Error(),
Data: crc.res.Result,
} }
} }
} }
return ccr.err
}
func (ccr *ClientResponseCodec) Error() error { return crc.err
return ccr.res.Error
} }
func (ccr *ClientResponseCodec) Close() { func (crc *ClientResponseCodec) Error() error {
releaseClientResponseCodec(ccr) return crc.res.Error
} }
var clientResponseCodecPool sync.Pool func (crc *ClientResponseCodec) Notification() (protocol.ClientNotificationCodec, error) {
if nil != crc.res.ID || nil == crc.res.Result {
func retainClientResponseCodec() *ClientResponseCodec { return nil, fmt.Errorf("RPC[JSON]: This is not notification")
v := clientResponseCodecPool.Get()
if v == nil {
return &ClientResponseCodec{}
}
return v.(*ClientResponseCodec)
} }
func releaseClientResponseCodec(ccr *ClientResponseCodec) { noti := &clientNotification{}
ccr.res.Result = nil err := json.Unmarshal(*crc.res.Result, noti)
ccr.res.Error = nil if nil != err {
ccr.res.ID = 0 return nil, err
}
clientResponseCodecPool.Put(ccr)
return &ClientNotificationCodec{noti: noti, err: err, codec: crc.codec}, nil
}
// newClientMessageCodec returns a new ClientMessageCodec.
func newClientResponseCodec(r io.Reader, codec codec.Codec) (protocol.ClientResponseCodec, error) {
res := &clientResponse{}
err := json.NewDecoder(r).Decode(res)
if err != nil {
if err == io.ErrUnexpectedEOF || err == io.EOF {
return nil, err
}
err = &Error{
Code: E_PARSE,
Message: err.Error(),
Data: res,
}
}
if res.Version != Version {
err = &Error{
Code: E_INVALID_REQ,
Message: "jsonrpc must be " + Version,
Data: res,
}
}
return &ClientResponseCodec{res: res, err: err, codec: codec}, nil
} }

47
protocol/json/server.go
View File

@ -3,7 +3,6 @@ package json
import ( import (
"encoding/json" "encoding/json"
"io" "io"
"sync"
"git.loafle.net/commons_go/rpc/codec" "git.loafle.net/commons_go/rpc/codec"
"git.loafle.net/commons_go/rpc/protocol" "git.loafle.net/commons_go/rpc/protocol"
@ -11,13 +10,6 @@ import (
var null = json.RawMessage([]byte("null")) var null = json.RawMessage([]byte("null"))
type serverMessage struct {
// JSON-RPC protocol.
Version string `json:"jsonrpc"`
MessageType protocol.MessageType `json:"messageType"`
Message interface{} `json:"message"`
}
// ---------------------------------------------------------------------------- // ----------------------------------------------------------------------------
// Codec // Codec
// ---------------------------------------------------------------------------- // ----------------------------------------------------------------------------
@ -44,44 +36,13 @@ func (sc *ServerCodec) NewRequest(r io.Reader) (protocol.ServerRequestCodec, err
// WriteNotification send a notification from server to client. // WriteNotification send a notification from server to client.
func (sc *ServerCodec) WriteNotification(w io.Writer, method string, args interface{}) error { func (sc *ServerCodec) WriteNotification(w io.Writer, method string, args interface{}) error {
noti := retainServerNotification(method, args) noti := &serverNotification{Method: method, Params: args}
defer func() { res := &serverResponse{Version: Version, Result: noti}
releaseServerNotification(noti)
}()
msg := retainServerMessage(protocol.MessageTypeNotification, noti)
defer func() {
releaseServerMessage(msg)
}()
encoder := json.NewEncoder(sc.codecSel.SelectByWriter(w).Encode(w)) encoder := json.NewEncoder(sc.codecSel.SelectByWriter(w).Encode(w))
// Not sure in which case will this happen. But seems harmless. // Not sure in which case will this happen. But seems harmless.
if err := encoder.Encode(msg); nil != err { if err := encoder.Encode(res); nil != err {
return err return err
} }
return nil return nil
} }
var serverMessagePool sync.Pool
func retainServerMessage(msgType protocol.MessageType, msg interface{}) *serverMessage {
var sm *serverMessage
v := serverMessagePool.Get()
if v == nil {
sm = &serverMessage{}
} else {
sm = v.(*serverMessage)
}
sm.Version = Version
sm.MessageType = msgType
sm.Message = msg
return sm
}
func releaseServerMessage(sm *serverMessage) {
sm.Version = ""
sm.MessageType = protocol.MessageTypeUnknown
sm.Message = nil
serverMessagePool.Put(sm)
}

28
protocol/json/server_notification.go
View File

@ -1,9 +1,5 @@
package json package json
import (
"sync"
)
// clientRequest represents a JSON-RPC request sent by a client. // clientRequest represents a JSON-RPC request sent by a client.
type serverNotification struct { type serverNotification struct {
// A String containing the name of the method to be invoked. // A String containing the name of the method to be invoked.
@ -12,27 +8,3 @@ type serverNotification struct {
// Object to pass as request parameter to the method. // Object to pass as request parameter to the method.
Params interface{} `json:"params"` Params interface{} `json:"params"`
} }
var serverNotificationPool sync.Pool
func retainServerNotification(method string, args interface{}) *serverNotification {
var sn *serverNotification
v := serverNotificationPool.Get()
if v == nil {
sn = &serverNotification{}
} else {
sn = v.(*serverNotification)
}
sn.Method = method
sn.Params = args
return sn
}
func releaseServerNotification(sn *serverNotification) {
sn.Method = ""
sn.Params = nil
serverNotificationPool.Put(sn)
}

72
protocol/json/server_request.go
View File

@ -3,7 +3,6 @@ package json
import ( import (
"encoding/json" "encoding/json"
"io" "io"
"sync"
"git.loafle.net/commons_go/rpc/codec" "git.loafle.net/commons_go/rpc/codec"
"git.loafle.net/commons_go/rpc/protocol" "git.loafle.net/commons_go/rpc/protocol"
@ -37,7 +36,7 @@ type serverRequest struct {
// newRequestCodec returns a new ServerRequestCodec. // newRequestCodec returns a new ServerRequestCodec.
func newServerRequestCodec(r io.Reader, codec codec.Codec) (protocol.ServerRequestCodec, error) { func newServerRequestCodec(r io.Reader, codec codec.Codec) (protocol.ServerRequestCodec, error) {
// Decode the request body and check if RPC method is valid. // Decode the request body and check if RPC method is valid.
req := retainServerRequest() req := &serverRequest{}
err := json.NewDecoder(r).Decode(req) err := json.NewDecoder(r).Decode(req)
if err == io.ErrUnexpectedEOF || err == io.EOF { if err == io.ErrUnexpectedEOF || err == io.EOF {
return nil, err return nil, err
@ -57,7 +56,7 @@ func newServerRequestCodec(r io.Reader, codec codec.Codec) (protocol.ServerReque
} }
} }
return retainServerRequestCodec(req, err, codec), nil return &ServerRequestCodec{req: req, err: err, codec: codec}, nil
} }
// ServerRequestCodec decodes and encodes a single request. // ServerRequestCodec decodes and encodes a single request.
@ -67,14 +66,6 @@ type ServerRequestCodec struct {
codec codec.Codec codec codec.Codec
} }
// Close is callback function that end of request.
func (src *ServerRequestCodec) Close() {
if nil != src.req {
releaseServerRequest(src.req)
}
releaseServerRequestCodec(src)
}
// Method returns the RPC method for the current request. // Method returns the RPC method for the current request.
// //
// The method uses a dotted notation as in "Service.Method". // The method uses a dotted notation as in "Service.Method".
@ -157,7 +148,7 @@ func (src *ServerRequestCodec) Params() ([]string, error) {
// WriteResponse encodes the response and writes it to the ResponseWriter. // WriteResponse encodes the response and writes it to the ResponseWriter.
func (src *ServerRequestCodec) WriteResponse(w io.Writer, reply interface{}) error { func (src *ServerRequestCodec) WriteResponse(w io.Writer, reply interface{}) error {
res := retainServerResponse(reply, nil, src.req.ID) res := &serverResponse{Version: Version, Result: reply, ID: src.req.ID}
return src.writeServerResponse(w, res) return src.writeServerResponse(w, res)
} }
@ -170,69 +161,18 @@ func (src *ServerRequestCodec) WriteError(w io.Writer, status int, err error) er
Message: err.Error(), Message: err.Error(),
} }
} }
res := retainServerResponse(nil, jsonErr, src.req.ID) res := &serverResponse{Version: Version, Error: jsonErr, ID: src.req.ID}
return src.writeServerResponse(w, res) return src.writeServerResponse(w, res)
} }
func (src *ServerRequestCodec) writeServerResponse(w io.Writer, res *serverResponse) error { func (src *ServerRequestCodec) writeServerResponse(w io.Writer, res *serverResponse) error {
defer func() {
releaseServerResponse(res)
}()
// ID is null for notifications and they don't have a response. // ID is null for notifications and they don't have a response.
if src.req.ID != nil { if req.ID != nil {
msg := retainServerMessage(protocol.MessageTypeResponse, res)
defer func() {
releaseServerMessage(msg)
}()
encoder := json.NewEncoder(src.codec.Encode(w)) encoder := json.NewEncoder(src.codec.Encode(w))
// Not sure in which case will this happen. But seems harmless. // Not sure in which case will this happen. But seems harmless.
if err := encoder.Encode(msg); nil != err { if err := encoder.Encode(res); nil != err {
return err return err
} }
} }
return nil return nil
} }
var serverRequestCodecPool sync.Pool
func retainServerRequestCodec(req *serverRequest, err error, codec codec.Codec) *ServerRequestCodec {
var src *ServerRequestCodec
v := serverRequestCodecPool.Get()
if v == nil {
src = &ServerRequestCodec{}
} else {
src = v.(*ServerRequestCodec)
}
src.req = req
src.err = err
src.codec = codec
return src
}
func releaseServerRequestCodec(src *ServerRequestCodec) {
src.req = nil
src.err = nil
src.codec = nil
serverRequestCodecPool.Put(src)
}
var serverRequestPool sync.Pool
func retainServerRequest() *serverRequest {
v := serverRequestPool.Get()
if v == nil {
return &serverRequest{}
}
return v.(*serverRequest)
}
func releaseServerRequest(sr *serverRequest) {
sr.Method = ""
sr.Params = nil
sr.ID = nil
serverRequestPool.Put(sr)
}

29
protocol/json/server_response.go
View File

@ -2,7 +2,6 @@ package json
import ( import (
"encoding/json" "encoding/json"
"sync"
) )
// ---------------------------------------------------------------------------- // ----------------------------------------------------------------------------
@ -11,6 +10,8 @@ import (
// serverResponse represents a JSON-RPC response returned by the server. // serverResponse represents a JSON-RPC response returned by the server.
type serverResponse struct { type serverResponse struct {
// JSON-RPC protocol.
Version string `json:"jsonrpc"`
// The Object that was returned by the invoked method. This must be null // The Object that was returned by the invoked method. This must be null
// in case there was an error invoking the method. // in case there was an error invoking the method.
// As per spec the member will be omitted if there was an error. // As per spec the member will be omitted if there was an error.
@ -24,29 +25,3 @@ type serverResponse struct {
// This must be the same id as the request it is responding to. // This must be the same id as the request it is responding to.
ID *json.RawMessage `json:"id,omitempty"` ID *json.RawMessage `json:"id,omitempty"`
} }
var serverResponsePool sync.Pool
func retainServerResponse(result interface{}, err *Error, id *json.RawMessage) *serverResponse {
var sr *serverResponse
v := serverResponsePool.Get()
if v == nil {
sr = &serverResponse{}
} else {
sr = v.(*serverResponse)
}
sr.Result = result
sr.Error = err
sr.ID = id
return sr
}
func releaseServerResponse(sr *serverResponse) {
sr.Result = nil
sr.Error = nil
sr.ID = nil
serverResponsePool.Put(sr)
}

1
protocol/registry_codec.go
View File

@ -10,5 +10,4 @@ type RegistryCodec interface {
// Reads the request filling the RPC method args. // Reads the request filling the RPC method args.
ReadParams(args []interface{}) error ReadParams(args []interface{}) error
Params() ([]string, error) Params() ([]string, error)
Close()
} }

1
protocol/server_codec.go
View File

@ -14,6 +14,7 @@ type ServerCodec interface {
// serialization scheme. // serialization scheme.
type ServerRequestCodec interface { type ServerRequestCodec interface {
RegistryCodec RegistryCodec
WriteResponse(w io.Writer, reply interface{}) error WriteResponse(w io.Writer, reply interface{}) error
WriteError(w io.Writer, status int, err error) error WriteError(w io.Writer, status int, err error) error
} }

124
servlet.go → rpc_servlet.go
View File

@ -11,25 +11,25 @@ import (
cuc "git.loafle.net/commons_go/util/context" cuc "git.loafle.net/commons_go/util/context"
) )
func NewServlet(sh ServletHandler) Servlet { func NewRPCServlet(sh RPCServletHandler) RPCServlet {
return &servlet{ return &rpcServlet{
sh: sh, sh: sh,
} }
} }
type Servlet interface { type RPCServlet interface {
Start(parentCTX cuc.Context, conn interface{}, doneChan chan<- error) error Start(parentCTX cuc.Context, conn interface{}, doneChan chan<- error) error
Stop() Stop()
Send(method string, args ...interface{}) (err error) Send(method string, args ...interface{}) (err error)
Context() ServletContext Context() RPCServletContext
} }
type servlet struct { type rpcServlet struct {
ctx ServletContext ctx RPCServletContext
sh ServletHandler sh RPCServletHandler
messageQueueChan chan *messageState responseQueueChan chan *responseState
doneChan chan<- error doneChan chan<- error
conn interface{} conn interface{}
@ -39,7 +39,7 @@ type servlet struct {
stopWg sync.WaitGroup stopWg sync.WaitGroup
} }
func (s *servlet) Start(parentCTX cuc.Context, conn interface{}, doneChan chan<- error) error { func (s *rpcServlet) Start(parentCTX cuc.Context, conn interface{}, doneChan chan<- error) error {
if nil == s.sh { if nil == s.sh {
panic("Servlet: servlet handler must be specified.") panic("Servlet: servlet handler must be specified.")
} }
@ -64,7 +64,7 @@ func (s *servlet) Start(parentCTX cuc.Context, conn interface{}, doneChan chan<-
} }
s.stopChan = make(chan struct{}) s.stopChan = make(chan struct{})
s.messageQueueChan = make(chan *messageState, s.sh.GetPendingMessages()) s.responseQueueChan = make(chan *responseState, s.sh.GetPendingResponses())
s.stopWg.Add(1) s.stopWg.Add(1)
go handleServlet(s) go handleServlet(s)
@ -72,7 +72,7 @@ func (s *servlet) Start(parentCTX cuc.Context, conn interface{}, doneChan chan<-
return nil return nil
} }
func (s *servlet) Stop() { func (s *rpcServlet) Stop() {
if s.stopChan == nil { if s.stopChan == nil {
panic("Server: server must be started before stopping it") panic("Server: server must be started before stopping it")
} }
@ -81,7 +81,7 @@ func (s *servlet) Stop() {
s.stopChan = nil s.stopChan = nil
s.sh.Destroy(s.ctx) s.sh.Destroy(s.ctx)
s.messageQueueChan = nil s.responseQueueChan = nil
s.conn = nil s.conn = nil
s.serverCodec = nil s.serverCodec = nil
@ -89,21 +89,25 @@ func (s *servlet) Stop() {
logging.Logger().Info(fmt.Sprintf("Servlet is stopped")) logging.Logger().Info(fmt.Sprintf("Servlet is stopped"))
} }
func (s *servlet) Send(method string, args ...interface{}) (err error) { func (s *rpcServlet) Send(method string, args ...interface{}) (err error) {
ms := retainMessageState(protocol.MessageTypeNotification) noti := &notification{
ms.noti.method = method method: method,
ms.noti.args = args args: args,
}
rs := &responseState{
noti: noti,
}
s.messageQueueChan <- ms s.responseQueueChan <- rs
return nil return nil
} }
func (s *servlet) Context() ServletContext { func (s *rpcServlet) Context() RPCServletContext {
return s.ctx return s.ctx
} }
func handleServlet(s *servlet) { func handleServlet(s *rpcServlet) {
var err error var err error
defer func() { defer func() {
@ -137,7 +141,7 @@ func handleServlet(s *servlet) {
} }
} }
func handleReader(s *servlet, stopChan chan struct{}, doneChan chan error) { func handleReader(s *rpcServlet, stopChan chan struct{}, doneChan chan error) {
var err error var err error
defer func() { defer func() {
if r := recover(); r != nil { if r := recover(); r != nil {
@ -149,7 +153,7 @@ func handleReader(s *servlet, stopChan chan struct{}, doneChan chan error) {
}() }()
for { for {
requestCodec, err := s.sh.GetRequest(s.ctx, s.serverCodec, s.conn) requestCodec, err := s.sh.ReadRequest(s.ctx, s.serverCodec, s.conn)
if nil != err { if nil != err {
if err == io.ErrUnexpectedEOF || err == io.EOF { if err == io.ErrUnexpectedEOF || err == io.EOF {
err = fmt.Errorf("RPC Server: disconnected from client") err = fmt.Errorf("RPC Server: disconnected from client")
@ -171,108 +175,72 @@ func handleReader(s *servlet, stopChan chan struct{}, doneChan chan error) {
} }
} }
func handleWriter(s *servlet, stopChan chan struct{}, doneChan chan error) { func handleWriter(s *rpcServlet, stopChan chan struct{}, doneChan chan error) {
var err error var err error
defer func() { defer func() {
if r := recover(); r != nil { if r := recover(); r != nil {
if err == nil { if err == nil {
err = fmt.Errorf("RPC Server: Panic when writing message to client: %v", r) err = fmt.Errorf("RPC Server: Panic when writing response to client: %v", r)
} }
} }
doneChan <- err doneChan <- err
}() }()
for { for {
var ms *messageState var rs *responseState
select { select {
case ms = <-s.messageQueueChan: case rs = <-s.responseQueueChan:
default: default:
// Give the last chance for ready goroutines filling s.messageQueueChan :) // Give the last chance for ready goroutines filling s.responseQueueChan :)
runtime.Gosched() runtime.Gosched()
select { select {
case <-stopChan: case <-stopChan:
err = fmt.Errorf("RPC Server: writing message stopped because get stop channel") err = fmt.Errorf("RPC Server: writing message stopped because get stop channel")
return return
case ms = <-s.messageQueueChan: case rs = <-s.responseQueueChan:
} }
} }
switch ms.messageType { if nil != rs.requestCodec {
case protocol.MessageTypeResponse: if err := s.sh.WriteResponse(s.ctx, s.conn, rs.requestCodec, rs.result, rs.err); nil != err {
if err := s.sh.SendResponse(s.ctx, s.conn, ms.res.requestCodec, ms.res.result, ms.res.err); nil != err { logging.Logger().Error(fmt.Sprintf("RPC Server: response error %v", err))
logging.Logger().Error(fmt.Sprintf("RPC Server: response message error %v", err))
} }
ms.res.requestCodec.Close() } else {
case protocol.MessageTypeNotification: if err := s.sh.WriteNotification(s.ctx, s.conn, s.serverCodec, rs.noti.method, rs.noti.args); nil != err {
if err := s.sh.SendNotification(s.ctx, s.conn, s.serverCodec, ms.noti.method, ms.noti.args...); nil != err { logging.Logger().Error(fmt.Sprintf("RPC Server: notification error %v", err))
logging.Logger().Error(fmt.Sprintf("RPC Server: response message error %v", err))
} }
default:
} }
} }
} }
func handleRequest(s *servlet, requestCodec protocol.ServerRequestCodec) { func handleRequest(s *rpcServlet, requestCodec protocol.ServerRequestCodec) {
defer func() { defer func() {
s.stopWg.Done() s.stopWg.Done()
}() }()
result, err := s.sh.Invoke(s.ctx, requestCodec) result, err := s.sh.Invoke(s.ctx, requestCodec)
ms := retainMessageState(protocol.MessageTypeResponse) rs := &responseState{
ms.res.requestCodec = requestCodec requestCodec: requestCodec,
ms.res.result = result result: result,
ms.res.err = err err: err,
s.messageQueueChan <- ms
} }
type messageState struct { s.responseQueueChan <- rs
messageType protocol.MessageType
res messageResponse
noti messageNotification
} }
type messageResponse struct { type responseState struct {
requestCodec protocol.ServerRequestCodec requestCodec protocol.ServerRequestCodec
result interface{} result interface{}
noti *notification
err error err error
} }
type messageNotification struct { type notification struct {
method string method string
args []interface{} args []interface{}
} }
var messageStatePool sync.Pool
func retainMessageState(messageType protocol.MessageType) *messageState {
var ms *messageState
v := messageStatePool.Get()
if v == nil {
ms = &messageState{}
} else {
ms = v.(*messageState)
}
ms.messageType = messageType
return ms
}
func releaseMessageState(ms *messageState) {
ms.messageType = protocol.MessageTypeUnknown
ms.res.requestCodec = nil
ms.res.result = nil
ms.res.err = nil
ms.noti.method = ""
ms.noti.args = nil
messageStatePool.Put(ms)
}

20
rpc_servlet_context.go Normal file
View File

@ -0,0 +1,20 @@
package rpc
import (
cuc "git.loafle.net/commons_go/util/context"
)
type RPCServletContext interface {
cuc.Context
}
type rpcServletContext struct {
cuc.Context
}
func newRPCServletContext(parent cuc.Context) RPCServletContext {
sCTX := &rpcServletContext{}
sCTX.Context = cuc.NewContext(parent)
return sCTX
}

25
rpc_servlet_handler.go Normal file
View File

@ -0,0 +1,25 @@
package rpc
import (
"git.loafle.net/commons_go/rpc/protocol"
cuc "git.loafle.net/commons_go/util/context"
)
type RPCServletHandler interface {
ServletContext(parent cuc.Context) RPCServletContext
Init(servletCTX RPCServletContext) error
ReadRequest(servletCTX RPCServletContext, codec protocol.ServerCodec, conn interface{}) (protocol.ServerRequestCodec, error)
Invoke(servletCTX RPCServletContext, requestCodec protocol.RegistryCodec) (result interface{}, err error)
WriteResponse(servletCTX RPCServletContext, conn interface{}, requestCodec protocol.ServerRequestCodec, result interface{}, err error) error
WriteNotification(servletCTX RPCServletContext, conn interface{}, codec protocol.ServerCodec, method string, args []interface{}) error
Destroy(servletCTX RPCServletContext)
RegisterCodec(contentType string, codec protocol.ServerCodec)
getCodec(contentType string) (protocol.ServerCodec, error)
GetPendingResponses() int
Validate()
}

87
rpc_servlet_handlers.go Normal file
View File

@ -0,0 +1,87 @@
package rpc
import (
"fmt"
"strings"
"git.loafle.net/commons_go/rpc/protocol"
cuc "git.loafle.net/commons_go/util/context"
)
type RPCServletHandlers struct {
// The maximum number of pending messages in the queue.
//
// The number of pending requsts should exceed the expected number
// of concurrent goroutines calling client's methods.
// Otherwise a lot of ClientError.Overflow errors may appear.
//
// Default is DefaultPendingMessages.
PendingResponses int
codecs map[string]protocol.ServerCodec
}
func (sh *RPCServletHandlers) ServletContext(parent cuc.Context) RPCServletContext {
return newRPCServletContext(parent)
}
func (sh *RPCServletHandlers) Init(servletCTX RPCServletContext) error {
return nil
}
func (sh *RPCServletHandlers) ReadRequest(servletCTX RPCServletContext, codec protocol.ServerCodec, conn interface{}) (protocol.ServerRequestCodec, error) {
return nil, fmt.Errorf("Servlet Handler: ReadRequest is not implemented")
}
func (sh *RPCServletHandlers) Invoke(servletCTX RPCServletContext, requestCodec protocol.RegistryCodec) (result interface{}, err error) {
return nil, fmt.Errorf("Servlet Handler: Invoke is not implemented")
}
func (sh *RPCServletHandlers) WriteResponse(servletCTX RPCServletContext, conn interface{}, requestCodec protocol.ServerRequestCodec, result interface{}, err error) error {
return fmt.Errorf("Servlet Handler: WriteResponse is not implemented")
}
func (sh *RPCServletHandlers) WriteNotification(servletCTX RPCServletContext, conn interface{}, codec protocol.ServerCodec, method string, args []interface{}) error {
return fmt.Errorf("Servlet Handler: WriteNotification is not implemented")
}
func (sh *RPCServletHandlers) Destroy(servletCTX RPCServletContext) {
// no op
}
// RegisterCodec adds a new codec to the server.
//
// Codecs are defined to process a given serialization scheme, e.g., JSON or
// XML. A codec is chosen based on the "Content-Type" header from the request,
// excluding the charset definition.
func (sh *RPCServletHandlers) RegisterCodec(contentType string, codec protocol.ServerCodec) {
if nil == sh.codecs {
sh.codecs = make(map[string]protocol.ServerCodec)
}
sh.codecs[strings.ToLower(contentType)] = codec
}
func (sh *RPCServletHandlers) getCodec(contentType string) (protocol.ServerCodec, error) {
var codec protocol.ServerCodec
if contentType == "" && len(sh.codecs) == 1 {
// If Content-Type is not set and only one codec has been registered,
// then default to that codec.
for _, c := range sh.codecs {
codec = c
}
} else if codec = sh.codecs[strings.ToLower(contentType)]; codec == nil {
return nil, fmt.Errorf("Unrecognized Content-Type: %s", contentType)
}
return codec, nil
}
func (sh *RPCServletHandlers) GetPendingResponses() int {
return sh.PendingResponses
}
func (sh *RPCServletHandlers) Validate() {
if 0 >= sh.PendingResponses {
sh.PendingResponses = DefaultPendingResponses
}
}

2
server/servlet_handler.go
View File

@ -3,5 +3,5 @@ package server
import "git.loafle.net/commons_go/rpc" import "git.loafle.net/commons_go/rpc"
type ServletHandler interface { type ServletHandler interface {
rpc.ServletHandler rpc.RPCServletHandler
} }

6
server/servlet_handlers.go
View File

@ -9,12 +9,12 @@ import (
) )
type ServletHandlers struct { type ServletHandlers struct {
rpc.ServletHandlers rpc.RPCServletHandlers
RPCRegistry rpc.Registry RPCRegistry rpc.Registry
} }
func (sh *ServletHandlers) Invoke(requestCodec protocol.RegistryCodec) (result interface{}, err error) { func (sh *ServletHandlers) Invoke(servletCTX rpc.RPCServletContext, requestCodec protocol.RegistryCodec) (result interface{}, err error) {
if !sh.RPCRegistry.HasMethod(requestCodec.Method()) { if !sh.RPCRegistry.HasMethod(requestCodec.Method()) {
return nil, fmt.Errorf("RPC Servlet Handler: Method[%s] is not exist", requestCodec.Method()) return nil, fmt.Errorf("RPC Servlet Handler: Method[%s] is not exist", requestCodec.Method())
} }
@ -32,7 +32,7 @@ func (sh *ServletHandlers) Invoke(requestCodec protocol.RegistryCodec) (result i
} }
func (sh *ServletHandlers) Validate() { func (sh *ServletHandlers) Validate() {
sh.ServletHandlers.Validate() sh.RPCServletHandlers.Validate()
if nil == sh.RPCRegistry { if nil == sh.RPCRegistry {
logging.Logger().Panic(fmt.Sprintf("RPC Servlet Handler: RPC Registry must be specified")) logging.Logger().Panic(fmt.Sprintf("RPC Servlet Handler: RPC Registry must be specified"))

20
servlet_context.go
View File

@ -1,20 +0,0 @@
package rpc
import (
cuc "git.loafle.net/commons_go/util/context"
)
type ServletContext interface {
cuc.Context
}
type servletContext struct {
cuc.Context
}
func newServletContext(parent cuc.Context) ServletContext {
sCTX := &servletContext{}
sCTX.Context = cuc.NewContext(parent)
return sCTX
}

26
servlet_handler.go
View File

@ -1,26 +0,0 @@
package rpc
import (
"git.loafle.net/commons_go/rpc/protocol"
cuc "git.loafle.net/commons_go/util/context"
)
type ServletHandler interface {
ServletContext(parent cuc.Context) ServletContext
Init(servletCTX ServletContext) error
GetRequest(servletCTX ServletContext, codec protocol.ServerCodec, conn interface{}) (protocol.ServerRequestCodec, error)
Invoke(servletCTX ServletContext, requestCodec protocol.RegistryCodec) (result interface{}, err error)
SendResponse(servletCTX ServletContext, conn interface{}, requestCodec protocol.ServerRequestCodec, result interface{}, err error) error
SendNotification(servletCTX ServletContext, conn interface{}, codec protocol.ServerCodec, method string, args ...interface{}) error
Destroy(servletCTX ServletContext)
RegisterCodec(contentType string, codec protocol.ServerCodec)
getCodec(contentType string) (protocol.ServerCodec, error)
GetPendingMessages() int
Validate()
}

87
servlet_handlers.go
View File

@ -1,87 +0,0 @@
package rpc
import (
"fmt"
"strings"
"git.loafle.net/commons_go/rpc/protocol"
cuc "git.loafle.net/commons_go/util/context"
)
type ServletHandlers struct {
// The maximum number of pending messages in the queue.
//
// The number of pending requsts should exceed the expected number
// of concurrent goroutines calling client's methods.
// Otherwise a lot of ClientError.Overflow errors may appear.
//
// Default is DefaultPendingMessages.
PendingMessages int
codecs map[string]protocol.ServerCodec
}
func (sh *ServletHandlers) ServletContext(parent cuc.Context) ServletContext {
return newServletContext(parent)
}
func (sh *ServletHandlers) Init(servletCTX ServletContext) error {
return nil
}
func (sh *ServletHandlers) GetRequest(servletCTX ServletContext, codec protocol.ServerCodec, conn interface{}) (protocol.ServerRequestCodec, error) {
return nil, fmt.Errorf("Servlet Handler: GetRequest is not implemented")
}
func (sh *ServletHandlers) Invoke(servletCTX ServletContext, requestCodec protocol.RegistryCodec) (result interface{}, err error) {
return nil, fmt.Errorf("Servlet Handler: Invoke is not implemented")
}
func (sh *ServletHandlers) SendResponse(servletCTX ServletContext, conn interface{}, requestCodec protocol.ServerRequestCodec, result interface{}, err error) error {
return fmt.Errorf("Servlet Handler: SendResponse is not implemented")
}
func (sh *ServletHandlers) SendNotification(servletCTX ServletContext, conn interface{}, codec protocol.ServerCodec, method string, args ...interface{}) error {
return fmt.Errorf("Servlet Handler: SendNotification is not implemented")
}
func (sh *ServletHandlers) Destroy(servletCTX ServletContext) {
// no op
}
// RegisterCodec adds a new codec to the server.
//
// Codecs are defined to process a given serialization scheme, e.g., JSON or
// XML. A codec is chosen based on the "Content-Type" header from the request,
// excluding the charset definition.
func (sh *ServletHandlers) RegisterCodec(contentType string, codec protocol.ServerCodec) {
if nil == sh.codecs {
sh.codecs = make(map[string]protocol.ServerCodec)
}
sh.codecs[strings.ToLower(contentType)] = codec
}
func (sh *ServletHandlers) getCodec(contentType string) (protocol.ServerCodec, error) {
var codec protocol.ServerCodec
if contentType == "" && len(sh.codecs) == 1 {
// If Content-Type is not set and only one codec has been registered,
// then default to that codec.
for _, c := range sh.codecs {
codec = c
}
} else if codec = sh.codecs[strings.ToLower(contentType)]; codec == nil {
return nil, fmt.Errorf("Unrecognized Content-Type: %s", contentType)
}
return codec, nil
}
func (sh *ServletHandlers) GetPendingMessages() int {
return sh.PendingMessages
}
func (sh *ServletHandlers) Validate() {
if 0 >= sh.PendingMessages {
sh.PendingMessages = DefaultPendingMessages
}
}