/
base_service.go
721 lines (666 loc) · 19 KB
/
base_service.go
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/**********************************************************\
| |
| hprose |
| |
| Official WebSite: http://www.hprose.com/ |
| http://www.hprose.org/ |
| |
\**********************************************************/
/**********************************************************\
* *
* rpc/base_service.go *
* *
* hprose base service for Go. *
* *
* LastModified: Sep 10, 2017 *
* Author: Ma Bingyao <andot@hprose.com> *
* *
\**********************************************************/
package rpc
import (
"errors"
"fmt"
"reflect"
"strings"
"sync"
"time"
"github.com/hprose/hprose-golang/io"
"github.com/hprose/hprose-golang/util"
)
// BaseService is the hprose base service
type BaseService struct {
methodManager
handlerManager
filterManager
FixArguments func(args []reflect.Value, context ServiceContext)
Event ServiceEvent
Debug bool
Timeout time.Duration
Heartbeat time.Duration
ErrorDelay time.Duration
UserData map[string]interface{}
topics map[string]*topic
topicLock sync.RWMutex
}
// DefaultFixArguments is the default FixArguments function
func DefaultFixArguments(args []reflect.Value, context ServiceContext) {
i := len(args) - 1
typ := args[i].Type()
if typ == interfaceType || typ == contextType || typ == serviceContextType {
args[i] = reflect.ValueOf(context)
}
}
// InitBaseService initializes BaseService
func (service *BaseService) InitBaseService() {
service.initMethodManager()
service.initHandlerManager()
service.Timeout = 120 * time.Second
service.Heartbeat = 3 * time.Second
service.ErrorDelay = 10 * time.Second
service.topics = make(map[string]*topic)
service.AddFunction("#", util.UUIDv4, Options{Simple: true})
service.override.invokeHandler = func(
name string, args []reflect.Value,
context Context) (results []reflect.Value, err error) {
return invoke(name, args, context.(ServiceContext))
}
service.override.beforeFilterHandler = func(
request []byte, context Context) (response []byte, err error) {
return service.beforeFilter(request, context.(ServiceContext))
}
service.override.afterFilterHandler = func(
request []byte, context Context) (response []byte, err error) {
return service.afterFilter(request, context.(ServiceContext))
}
}
// AddFunction publish a func or bound method
// name is the method name
// function is a func or bound method
// options includes Mode, Simple, Oneway and NameSpace
func (service *BaseService) AddFunction(name string, function interface{}, option ...Options) Service {
service.methodManager.AddFunction(name, function, option...)
return service
}
// AddFunctions is used for batch publishing service method
func (service *BaseService) AddFunctions(names []string, functions []interface{}, option ...Options) Service {
service.methodManager.AddFunctions(names, functions, option...)
return service
}
// AddMethod is used for publishing a method on the obj with an alias
func (service *BaseService) AddMethod(name string, obj interface{}, alias string, option ...Options) Service {
service.methodManager.AddMethod(name, obj, alias, option...)
return service
}
// AddMethods is used for batch publishing methods on the obj with aliases
func (service *BaseService) AddMethods(names []string, obj interface{}, aliases []string, option ...Options) Service {
service.methodManager.AddMethods(names, obj, aliases, option...)
return service
}
// AddInstanceMethods is used for publishing all the public methods and func fields with options.
func (service *BaseService) AddInstanceMethods(obj interface{}, option ...Options) Service {
service.methodManager.AddInstanceMethods(obj, option...)
return service
}
// AddAllMethods will publish all methods and non-nil function fields on the
// obj self and on its anonymous or non-anonymous struct fields (or pointer to
// pointer ... to pointer struct fields). This is a recursive operation.
// So it's a pit, if you do not know what you are doing, do not step on.
func (service *BaseService) AddAllMethods(obj interface{}, option ...Options) Service {
service.methodManager.AddAllMethods(obj, option...)
return service
}
// AddMissingMethod is used for publishing a method,
// all methods not explicitly published will be redirected to this method.
func (service *BaseService) AddMissingMethod(method MissingMethod, option ...Options) Service {
service.methodManager.AddMissingMethod(method, option...)
return service
}
// AddNetRPCMethods is used for publishing methods defined for net/rpc.
func (service *BaseService) AddNetRPCMethods(rcvr interface{}, option ...Options) Service {
service.methodManager.AddNetRPCMethods(rcvr, option...)
return service
}
// Remove the published func or method by name
func (service *BaseService) Remove(name string) Service {
service.methodManager.Remove(name)
return service
}
// SetFilter will replace the current filter settings
func (service *BaseService) SetFilter(filter ...Filter) Service {
service.filterManager.SetFilter(filter...)
return service
}
// AddFilter add the filter to this Service
func (service *BaseService) AddFilter(filter ...Filter) Service {
service.filterManager.AddFilter(filter...)
return service
}
// RemoveFilterByIndex remove the filter by the index
func (service *BaseService) RemoveFilterByIndex(index int) Service {
service.filterManager.RemoveFilterByIndex(index)
return service
}
// RemoveFilter remove the filter from this Service
func (service *BaseService) RemoveFilter(filter ...Filter) Service {
service.filterManager.RemoveFilter(filter...)
return service
}
// AddInvokeHandler add the invoke handler to this Service
func (service *BaseService) AddInvokeHandler(handler ...InvokeHandler) Service {
service.handlerManager.AddInvokeHandler(handler...)
return service
}
// AddBeforeFilterHandler add the filter handler before filters
func (service *BaseService) AddBeforeFilterHandler(handler ...FilterHandler) Service {
service.handlerManager.AddBeforeFilterHandler(handler...)
return service
}
// AddAfterFilterHandler add the filter handler after filters
func (service *BaseService) AddAfterFilterHandler(handler ...FilterHandler) Service {
service.handlerManager.AddAfterFilterHandler(handler...)
return service
}
// SetUserData for service
func (service *BaseService) SetUserData(
userdata map[string]interface{}) Service {
service.UserData = userdata
return service
}
func callService(
name string, args []reflect.Value,
context ServiceContext) (results []reflect.Value, err error) {
remoteMethod := context.Method()
function := remoteMethod.Function
if context.IsMissingMethod() {
missingMethod := function.Interface().(MissingMethod)
return missingMethod(name, args, context)
}
ft := function.Type()
if !ft.IsVariadic() {
count := len(args)
n := ft.NumIn()
if n < count {
args = args[:n]
}
}
results = function.Call(args)
n := ft.NumOut()
if n == 0 {
return results, nil
}
if ft.Out(n-1) == errorType {
err, _ = results[n-1].Interface().(error)
results = results[:n-1]
}
return results, err
}
func doOutput(
args []reflect.Value,
results []reflect.Value,
context ServiceContext) []byte {
method := context.Method()
writer := io.NewWriter(method.Simple)
switch method.Mode {
case RawWithEndTag:
return results[0].Bytes()
case Raw:
writer.Write(results[0].Bytes())
default:
writer.WriteByte(io.TagResult)
if method.Mode == Serialized {
writer.Write(results[0].Bytes())
} else {
switch len(results) {
case 0:
writer.WriteNil()
case 1:
writer.WriteValue(results[0])
default:
writer.WriteSlice(results)
}
}
if context.ByRef() {
writer.WriteByte(io.TagArgument)
writer.Reset()
writer.WriteSlice(args)
}
}
return writer.Bytes()
}
func getErrorMessage(err error, debug bool) string {
if panicError, ok := err.(*PanicError); ok {
if debug {
return fmt.Sprintf("%v\r\n%s", panicError.Panic, panicError.Stack)
}
return panicError.Error()
}
return err.Error()
}
// FireErrorEvent fires the OnSendError
func FireErrorEvent(event ServiceEvent, e error, context Context) (err error) {
defer func() {
if e := recover(); e != nil {
err = NewPanicError(e)
}
}()
err = e
switch event := event.(type) {
case sendErrorEvent:
event.OnSendError(err, context)
case sendErrorEvent2:
err = event.OnSendError(err, context)
}
return err
}
func fireBeforeInvokeEvent(
event ServiceEvent,
name string,
args []reflect.Value,
context ServiceContext) (err error) {
defer func() {
if e := recover(); e != nil {
err = NewPanicError(e)
}
}()
switch event := event.(type) {
case beforeInvokeEvent:
event.OnBeforeInvoke(name, args, context.ByRef(), context)
case beforeInvokeEvent2:
err = event.OnBeforeInvoke(name, args, context.ByRef(), context)
}
return err
}
func fireAfterInvokeEvent(
event ServiceEvent,
name string,
args []reflect.Value,
results []reflect.Value,
context ServiceContext) (err error) {
defer func() {
if e := recover(); e != nil {
err = NewPanicError(e)
}
}()
switch event := event.(type) {
case afterInvokeEvent:
event.OnAfterInvoke(name, args, context.ByRef(), results, context)
case afterInvokeEvent2:
err = event.OnAfterInvoke(name, args, context.ByRef(), results, context)
}
return err
}
func (service *BaseService) sendError(err error, context Context) []byte {
err = FireErrorEvent(service.Event, err, context)
w := io.NewWriter(true)
w.WriteByte(io.TagError)
w.WriteString(getErrorMessage(err, service.Debug))
return w.Bytes()
}
// EndError return the error response with TagEnd
func (service *BaseService) EndError(err error, context Context) []byte {
w := io.NewByteWriter(service.sendError(err, context))
w.WriteByte(io.TagEnd)
return w.Bytes()
}
func invoke(
name string,
args []reflect.Value,
context ServiceContext) ([]reflect.Value, error) {
if context.Method() == nil {
return nil, errors.New("Can't find this method " + name)
}
if context.Method().Oneway {
go func() {
defer func() {
recover()
}()
callService(name, args, context)
}()
return nil, nil
}
return callService(name, args, context)
}
func readArguments(
fixArguments func(args []reflect.Value, context ServiceContext),
reader *io.Reader,
method *Method,
hasArgs bool,
context ServiceContext) (args []reflect.Value) {
count := 0
if hasArgs {
if method != nil {
reader.JSONCompatible = method.JSONCompatible
}
if method == nil || context.IsMissingMethod() {
return reader.ReadSliceWithoutTag()
}
count = reader.ReadCount()
}
ft := method.Function.Type()
n := ft.NumIn()
if ft.IsVariadic() {
n--
}
max := util.Max(n, count)
args = make([]reflect.Value, max)
for i := 0; i < n; i++ {
args[i] = reflect.New(ft.In(i)).Elem()
}
if n < count {
if ft.IsVariadic() {
for i := n; i < count; i++ {
args[i] = reflect.New(ft.In(n).Elem()).Elem()
}
} else {
for i := n; i < count; i++ {
args[i] = reflect.New(interfaceType).Elem()
}
}
}
if hasArgs {
reader.ReadSlice(args[:count])
}
if !ft.IsVariadic() && n > count {
fixArguments(args, context)
}
return
}
func (service *BaseService) beforeInvoke(
name string,
args []reflect.Value,
context ServiceContext) ([]byte, error) {
err := fireBeforeInvokeEvent(service.Event, name, args, context)
if err != nil {
return nil, err
}
var results []reflect.Value
results, err = service.handlerManager.invokeHandler(name, args, context)
if err != nil {
return nil, err
}
err = fireAfterInvokeEvent(service.Event, name, args, results, context)
if err != nil {
return nil, err
}
return doOutput(args, results, context), nil
}
func mergeResult(results [][]byte) []byte {
n := len(results)
if n == 1 {
return append(results[0], io.TagEnd)
}
writer := io.NewByteWriter(results[0])
for i := 1; i < n; i++ {
writer.Write(results[i])
}
writer.WriteByte(io.TagEnd)
return writer.Bytes()
}
func (service *BaseService) doSingleInvoke(
reader *io.Reader, context ServiceContext) (result []byte, tag byte) {
name := reader.ReadString()
alias := strings.ToLower(name)
method := service.RemoteMethods[alias]
if method == nil {
method = service.RemoteMethods["*"]
context.setIsMissingMethod(true)
}
tag = reader.CheckTags([]byte{io.TagList, io.TagEnd, io.TagCall})
var args []reflect.Value
if tag == io.TagList {
reader.Reset()
args = readArguments(service.FixArguments, reader, method, true, context)
tag = reader.CheckTags([]byte{io.TagTrue, io.TagEnd, io.TagCall})
if tag == io.TagTrue {
context.setByRef(true)
tag = reader.CheckTags([]byte{io.TagEnd, io.TagCall})
}
} else if !context.IsMissingMethod() {
args = readArguments(service.FixArguments, reader, method, false, context)
}
context.setMethod(method)
result, err := service.beforeInvoke(name, args, context)
if err != nil {
return service.sendError(err, context), tag
}
return result, tag
}
func (service *BaseService) doInvoke(
reader *io.Reader,
context ServiceContext) []byte {
var results [][]byte
for {
result, tag := service.doSingleInvoke(reader, context)
results = append(results, result)
if tag != io.TagCall {
break
}
reader.Reset()
}
return mergeResult(results)
}
// DoFunctionList returns the function list
func (service *BaseService) DoFunctionList(context ServiceContext) []byte {
writer := io.NewWriter(true)
writer.WriteByte(io.TagFunctions)
writer.WriteStringSlice(service.MethodNames)
writer.WriteByte(io.TagEnd)
return writer.Bytes()
}
func (service *BaseService) afterFilter(
request []byte, context ServiceContext) ([]byte, error) {
reader := io.AcquireReader(request, false)
defer io.ReleaseReader(reader)
tag, err := reader.ReadByte()
if err != nil {
return nil, err
}
switch tag {
case io.TagCall:
return service.doInvoke(reader, context), nil
case io.TagEnd:
return service.DoFunctionList(context), nil
default:
return nil, fmt.Errorf("Wrong Request: \r\n%s", request)
}
}
func (service *BaseService) delayError(
err error, context ServiceContext) []byte {
response := service.EndError(err, context)
if service.ErrorDelay > 0 {
time.Sleep(service.ErrorDelay)
}
return response
}
func (service *BaseService) beforeFilter(
request []byte, context ServiceContext) (response []byte, err error) {
request, err = service.inputFilter(request, context)
if err == nil {
response, err = service.afterFilterHandler(request, context)
}
if err != nil {
response = service.delayError(err, context)
}
return service.outputFilter(response, context)
}
// Handle the hprose request and return the hprose response
func (service *BaseService) Handle(request []byte, context Context) []byte {
if service.UserData != nil {
for k, v := range service.UserData {
context.SetInterface(k, v)
}
}
response, err := service.beforeFilterHandler(request, context)
if err != nil {
return service.EndError(err, context)
}
return response
}
func fireSubscribeEvent(
topic string,
id string,
service *BaseService) {
defer func() {
recover()
}()
if event, ok := service.Event.(subscribeEvent); ok {
event.OnSubscribe(topic, id, service)
}
}
func fireUnsubscribeEvent(
topic string,
id string,
service *BaseService) {
defer func() {
recover()
}()
if event, ok := service.Event.(unsubscribeEvent); ok {
event.OnUnsubscribe(topic, id, service)
}
}
func (service *BaseService) offline(t *topic, topic string, id string) {
if t.exist(id) {
t.remove(id)
fireUnsubscribeEvent(topic, id, service)
}
}
var heartbeatSignals = new(interface{})
// Publish the hprose push topic
func (service *BaseService) Publish(
topic string,
timeout time.Duration,
heartbeat time.Duration) Service {
if timeout <= 0 {
timeout = service.Timeout
}
if heartbeat <= 0 {
heartbeat = service.Heartbeat
}
t := newTopic(heartbeat)
service.topicLock.Lock()
service.topics[topic] = t
service.topicLock.Unlock()
return service.AddFunction(topic, func(id string) interface{} {
message := t.get(id)
if message == nil {
message = make(chan interface{})
t.put(id, message)
fireSubscribeEvent(topic, id, service)
}
receiveMessage:
select {
case result := <-message:
if result == heartbeatSignals {
goto receiveMessage
}
return result
case <-time.After(timeout):
go func() {
select {
case message <- heartbeatSignals:
break
case <-time.After(t.heartbeat):
service.offline(t, topic, id)
}
}()
return nil
}
}, Options{})
}
func (service *BaseService) getTopic(topic string) (t *topic) {
service.topicLock.RLock()
t = service.topics[topic]
service.topicLock.RUnlock()
if t == nil {
panic("topic \"" + topic + "\" is not published.")
}
return
}
func (service *BaseService) unicast(
t *topic, topic string, id string, result interface{}, callback func(bool)) {
message := t.get(id)
if message == nil {
if callback != nil {
callback(false)
}
return
}
go func() {
select {
case message <- result:
if callback != nil {
callback(true)
}
break
case <-time.After(t.heartbeat):
service.offline(t, topic, id)
if callback != nil {
callback(false)
}
}
}()
}
// IDList returns the push client id list
func (service *BaseService) IDList(topic string) []string {
return service.getTopic(topic).idlist()
}
// Exist returns true if the client id exist.
func (service *BaseService) Exist(topic string, id string) bool {
return service.getTopic(topic).exist(id)
}
// Push result to clients
func (service *BaseService) Push(topic string, result interface{}, id ...string) {
t := service.getTopic(topic)
n := len(id)
if n == 0 {
id = t.idlist()
n = len(id)
if n == 0 {
return
}
}
for i := 0; i < n; i++ {
service.unicast(t, topic, id[i], result, nil)
}
}
// Broadcast push result to all clients
func (service *BaseService) Broadcast(
topic string, result interface{}, callback func([]string)) {
service.Multicast(topic, service.IDList(topic), result, callback)
}
// Multicast result to the specified clients
func (service *BaseService) Multicast(
topic string, ids []string, result interface{}, callback func([]string)) {
t := service.getTopic(topic)
m := 0
n := len(ids)
if n == 0 {
callback(nil)
return
}
sid := make(chan string)
go func() {
sended := make([]string, 0, n)
for id := range sid {
sended = append(sended, id)
}
callback(sended)
}()
for i := 0; i < n; i++ {
id := ids[i]
service.unicast(t, topic, id, result, func(ok bool) {
if ok {
sid <- id
}
m++
if m == n {
close(sid)
}
})
}
}
// Unicast result to then specified client
func (service *BaseService) Unicast(
topic string, id string, result interface{}, callback func(bool)) {
service.unicast(service.getTopic(topic), topic, id, result, callback)
}