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// SPDX-FileCopyrightText: 2022 UnionTech Software Technology Co., Ltd.
//
// SPDX-License-Identifier: GPL-3.0-or-later
package x
import (
"sync"
)
type ReadErrorFunc func(*Reader) Error
type lazyReplyTag uint
const (
lazyNone lazyReplyTag = iota
lazyCookie
lazyForced
)
type Extension struct {
id int
name string // extension-xname
maxErrCode uint8
errCodeNameMap map[uint8]string
reqOpcodeNameMap map[uint]string
}
func (ext *Extension) Name() string {
return ext.name
}
var nextExtId = 1
// only call it in init() func
func NewExtension(name string, maxErrCode uint8,
errCodeNameMap map[uint8]string, reqOpcodeNameMap map[uint]string) *Extension {
id := nextExtId
nextExtId++
return &Extension{
id: id,
name: name,
maxErrCode: maxErrCode,
errCodeNameMap: errCodeNameMap,
reqOpcodeNameMap: reqOpcodeNameMap,
}
}
type lazyReply struct {
tag lazyReplyTag
reply *QueryExtensionReply
cookie QueryExtensionCookie
}
type extAndData struct {
ext *Extension
reply *lazyReply
}
type ext struct {
mu sync.RWMutex
extensions []extAndData
}
func (e *ext) grow(n int) {
if n <= len(e.extensions) {
return
}
logPrintf("ext grow %d -> %d\n", len(e.extensions), n)
bigger := make([]extAndData, n)
copy(bigger, e.extensions)
e.extensions = bigger
}
func (e *ext) getById(id int) *extAndData {
if id > len(e.extensions) {
e.grow(id * 2)
}
return &e.extensions[id-1]
}
func (e *ext) getExtByMajorOpcode(majorOpcode uint8) *Extension {
for _, extAndData := range e.extensions {
ext := extAndData.ext
lzr := extAndData.reply
if ext != nil && lzr != nil && lzr.reply != nil {
if majorOpcode == lzr.reply.MajorOpcode {
return ext
}
}
}
return nil
}
func (e *ext) getExtErrName(errCode uint8) string {
for _, extAndData := range e.extensions {
ext := extAndData.ext
lzr := extAndData.reply
if ext != nil && lzr != nil && lzr.reply != nil {
base := lzr.reply.FirstError
max := lzr.reply.FirstError + ext.maxErrCode
if base <= errCode && errCode <= max {
return ext.errCodeNameMap[errCode-base]
}
}
}
return ""
}
func (e *ext) getLazyReply(conn *Conn, ext *Extension) (lzr *lazyReply) {
extAndData := e.getById(ext.id)
if extAndData.ext == nil {
// init extAndData
extAndData.ext = ext
extAndData.reply = &lazyReply{tag: lazyNone}
}
lzr = extAndData.reply
// lazyReply tag: lazyNone -> lazyCookie
if lzr.tag == lazyNone {
lzr.tag = lazyCookie
lzr.cookie = QueryExtension(conn, ext.name)
}
return
}
func (e *ext) getExtData(c *Conn, ext *Extension) *QueryExtensionReply {
lzr := e.getLazyReply(c, ext)
// lazyReply tag: lazyCookie -> lazyForced
if lzr.tag == lazyCookie {
lzr.tag = lazyForced
lzr.reply, _ = lzr.cookie.Reply(c)
}
return lzr.reply
}
func (c *Conn) GetExtensionData(ext *Extension) *QueryExtensionReply {
c.ext.mu.Lock()
data := c.ext.getExtData(c, ext)
c.ext.mu.Unlock()
return data
}
func (c *Conn) PrefetchExtensionData(ext *Extension) {
c.ext.mu.Lock()
c.ext.getLazyReply(c, ext)
c.ext.mu.Unlock()
}
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