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Copy pathfilter.go
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187 lines (164 loc) · 4.34 KB
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package golis
import "errors"
type IoFilter interface {
SessionOpened(session *Iosession) bool
SessionClosed(session *Iosession) bool
MsgReceived(session *Iosession, message interface{}) bool
MsgSend(session *Iosession, message interface{}) bool
ErrorCaught(sesion *Iosession, err error) bool
}
type IoFilterAdapter struct{}
func (*IoFilterAdapter) SessionOpened(session *Iosession) bool { return true }
func (*IoFilterAdapter) SessionClosed(session *Iosession) bool { return true }
func (*IoFilterAdapter) ErrorCaught(session *Iosession, err error) bool { return true }
func (*IoFilterAdapter) MsgSend(session *Iosession, message interface{}) bool { return true }
func (*IoFilterAdapter) MsgReceived(session *Iosession, message interface{}) bool { return true }
type Codecer interface {
Decode(buffer *Buffer, dataCh chan<- interface{}) error
Encode(message interface{}) ([]byte, error)
}
type ProtocalCodec struct {
}
func (*ProtocalCodec) Decode(buffer *Buffer, dataCh chan<- interface{}) error {
return nil
}
func (*ProtocalCodec) Encode(message interface{}) ([]byte, error) {
if bs, ok := message.([]byte); ok {
return bs, nil
}
return nil, errors.New("codec failed")
}
type entry struct {
name string
filter IoFilter
prev *entry
next *entry
}
func (e *entry) sessionOpened(session *Iosession) bool {
if e.filter.SessionOpened(session) {
if e.next != nil {
return e.next.sessionOpened(session)
} else {
return true
}
}
return false
}
func (e *entry) sessionClosed(session *Iosession) bool {
if e.filter.SessionClosed(session) {
if e.next != nil {
return e.next.sessionClosed(session)
} else {
return true
}
}
return false
}
func (e *entry) msgReceived(session *Iosession, message interface{}) bool {
var flag bool
if flag = e.filter.MsgReceived(session, message); flag && e.next != nil {
return e.next.msgReceived(session, message)
}
return flag
}
func (e *entry) errorCaught(session *Iosession, err error) bool {
if e.filter.ErrorCaught(session, err) {
if e.next != nil {
return e.next.errorCaught(session, err)
} else {
return true
}
}
return false
}
func (e *entry) msgSend(session *Iosession, message interface{}) (interface{}, bool) {
var flag bool
if flag = e.filter.MsgSend(session, message); flag && e.prev != nil {
return e.prev.msgSend(session, message)
}
return message, flag
}
// when invok return true ,it will next
type IoFilterChain struct {
head *entry
}
func (f *IoFilterChain) sessionOpened(session *Iosession) bool {
return f.head.sessionOpened(session)
}
func (f *IoFilterChain) sessionClosed(session *Iosession) bool {
return f.head.sessionClosed(session)
}
func (f *IoFilterChain) msgReceived(session *Iosession, message interface{}) bool {
return f.head.msgReceived(session, message)
}
func (f *IoFilterChain) errorCaught(session *Iosession, err error) bool {
return f.head.errorCaught(session, err)
}
func (f *IoFilterChain) msgSend(session *Iosession, message interface{}) (interface{}, bool) {
lastEntry := getLastEntry(f.head)
return lastEntry.msgSend(session, message)
}
func (f *IoFilterChain) AddLast(name string, filter IoFilter) *IoFilterChain {
if f.head == nil {
f.head = &entry{
name: name,
prev: nil,
next: nil,
filter: filter,
}
} else {
lastEntry := getLastEntry(f.head)
lastEntry.next = &entry{
name: name,
filter: filter,
next: nil,
prev: lastEntry,
}
}
return f
}
func (f *IoFilterChain) AddAfter(baseName, name string, filter IoFilter) *IoFilterChain {
if e, ok := getEntryByName(baseName, f.head); ok {
tmp := e.next
e.next = &entry{
name: name,
filter: filter,
next: tmp,
prev: e,
}
if tmp != nil {
tmp.prev = e.next
}
}
return f
}
func (f *IoFilterChain) AddBefore(baseName, name string, filter IoFilter) *IoFilterChain {
if e, ok := getEntryByName(baseName, f.head); ok {
tmp := e.prev
e.prev = &entry{
name: name,
filter: filter,
next: e,
prev: tmp,
}
if tmp != nil {
tmp.next = e.prev
}
}
return f
}
func getEntryByName(name string, root *entry) (*entry, bool) {
if root == nil {
return nil, false
}
if root.name == name {
return root, true
}
return getEntryByName(name, root.next)
}
func getLastEntry(head *entry) *entry {
if head.next == nil {
return head
}
return getLastEntry(head.next)
}