/
scene.go
357 lines (305 loc) · 8.32 KB
/
scene.go
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package scene
import (
"bytes"
"crypto/aes"
"crypto/cipher"
"crypto/rand"
"encoding/base64"
"encoding/json"
"fmt"
"github.com/23233/ggg/pipe"
"github.com/kataras/iris/v12"
"github.com/pkg/errors"
"github.com/redis/rueidis/rueidiscompat"
"io"
"net/http"
"time"
)
var (
ScenesInst = NewScenes()
)
type ScenesRateKeyFunc func(ctx iris.Context) (string, error)
type ScenesOptions struct {
Scene ISceneModelItem
rate *RateLimiter
rateKey ScenesRateKeyFunc
}
type ScenesItem struct {
scenes map[string]*ScenesOptions
scope string
model string
}
type ScenesHandler func(ctx iris.Context, mapper *RequestData) *pipe.RunResp[any]
type Scenes struct {
modules []*ScenesItem
cbcIv []byte
preHandler []ScenesHandler
afterHandler []ScenesHandler
prefix string
party iris.Party
}
type IScenes interface {
GetPrefix() string
SetPrefix(prefix string)
SetParty(party iris.Party)
GetParty() iris.Party
GetCbcSign() bool
SetCbcSign(iv []byte)
GetCbcIv() []byte
Decrypt(cipherText string) ([]byte, error)
Encrypt(plainText []byte) (string, error)
AddPreHandler(handler ...ScenesHandler)
GetPreHandler() []ScenesHandler
AddAfterHandler(handler ...ScenesHandler)
GetAfterHandler() []ScenesHandler
RegistryRouter(party iris.Party, prefix string)
ParseRequest() iris.Handler
GetItem(scope string, model string, scene string) (*ScenesOptions, bool)
GetScope(scope string) []*ScenesItem
GetModel(scope string, model string) []*ScenesItem
RegistryItem(scope string, model string, scene string, item ISceneModelItem) error
AddItemRate(scope string, model string, scene string, redisClient rueidiscompat.Cmdable, period time.Duration, maxCount int, interfaceKey string, keyFunc ScenesRateKeyFunc) error
}
func (m *Scenes) GetCbcSign() bool {
return m.cbcIv != nil
}
func (m *Scenes) SetCbcSign(iv []byte) {
m.cbcIv = iv
}
func (m *Scenes) GetCbcIv() []byte {
return m.cbcIv
}
func (m *Scenes) GetItem(scope string, model string, scene string) (*ScenesOptions, bool) {
for _, module := range m.modules {
if module.scope == scope && module.model == model {
item, exists := module.scenes[scene]
return item, exists
}
}
return nil, false
}
func (m *Scenes) GetScope(scope string) []*ScenesItem {
var result []*ScenesItem
for _, module := range m.modules {
if module.scope == scope {
result = append(result, module)
}
}
return result
}
func (m *Scenes) GetModel(scope string, model string) []*ScenesItem {
var result []*ScenesItem
for _, module := range m.modules {
if module.scope == scope && module.model == model {
result = append(result, module)
}
}
return result
}
func (m *Scenes) RegistryItem(scope string, model string, scene string, item ISceneModelItem) error {
var module *ScenesItem
for _, mod := range m.modules {
if mod.scope == scope && mod.model == model {
module = mod
break
}
}
if module == nil {
module = &ScenesItem{
scenes: make(map[string]*ScenesOptions),
scope: scope,
model: model,
}
m.modules = append(m.modules, module)
}
if _, exists := module.scenes[scene]; exists {
return fmt.Errorf("scene already exists")
}
module.scenes[scene] = &ScenesOptions{
Scene: item,
}
return nil
}
func (m *Scenes) Decrypt(cipherText string) ([]byte, error) {
cipherData, err := base64.URLEncoding.DecodeString(cipherText)
if err != nil {
return nil, err
}
block, err := aes.NewCipher(m.cbcIv)
if err != nil {
return nil, err
}
if len(cipherData) < aes.BlockSize {
return nil, fmt.Errorf("cipher text too short")
}
iv := cipherData[:aes.BlockSize]
cipherData = cipherData[aes.BlockSize:]
mode := cipher.NewCBCDecrypter(block, iv)
mode.CryptBlocks(cipherData, cipherData)
padding := cipherData[len(cipherData)-1]
return cipherData[:len(cipherData)-int(padding)], nil
}
func (m *Scenes) Encrypt(plainText []byte) (string, error) {
block, err := aes.NewCipher(m.cbcIv)
if err != nil {
return "", err
}
padding := aes.BlockSize - len(plainText)%aes.BlockSize
padText := bytes.Repeat([]byte{byte(padding)}, padding)
plainText = append(plainText, padText...)
cipherText := make([]byte, aes.BlockSize+len(plainText))
iv := cipherText[:aes.BlockSize]
if _, err := io.ReadFull(rand.Reader, iv); err != nil {
return "", err
}
mode := cipher.NewCBCEncrypter(block, iv)
mode.CryptBlocks(cipherText[aes.BlockSize:], plainText)
return base64.URLEncoding.EncodeToString(cipherText), nil
}
func (m *Scenes) AddPreHandler(handler ...ScenesHandler) {
m.preHandler = append(m.preHandler, handler...)
}
func (m *Scenes) AddAfterHandler(handler ...ScenesHandler) {
m.afterHandler = append(m.afterHandler, handler...)
}
func (m *Scenes) GetPreHandler() []ScenesHandler {
return m.preHandler
}
func (m *Scenes) GetAfterHandler() []ScenesHandler {
return m.afterHandler
}
func (m *Scenes) GetPrefix() string {
return m.prefix
}
func (m *Scenes) SetPrefix(prefix string) {
m.prefix = prefix
}
func (m *Scenes) SetParty(party iris.Party) {
m.party = party
}
func (m *Scenes) GetParty() iris.Party {
return m.party
}
func (m *Scenes) errMsg(ctx iris.Context, msg string, err error, codes ...int) {
code := iris.StatusBadRequest
if len(codes) >= 1 {
code = codes[0]
}
ctx.StatusCode(code)
ctx.JSON(iris.Map{"detail": msg})
}
func (m *Scenes) ParseRequest() iris.Handler {
return func(ctx iris.Context) {
// 仅接受POST请求
if ctx.Method() != "POST" {
ctx.StatusCode(iris.StatusMethodNotAllowed)
return
}
var requestData = new(RequestData)
// 检查是否需要解密
if m.GetCbcSign() {
// 读取请求体
body, err := ctx.GetBody()
if err != nil {
m.errMsg(ctx, "获取body失败", err)
return
}
// 解密请求体
decryptedBody, err := m.Decrypt(string(body))
if err != nil {
m.errMsg(ctx, "解密失败", err)
return
}
// 解析请求数据
if err := json.Unmarshal(decryptedBody, requestData); err != nil {
m.errMsg(ctx, "请求参数错误", err)
return
}
} else {
// 直接解析请求数据
if err := ctx.ReadJSON(requestData); err != nil {
m.errMsg(ctx, "解析请求参数格式失败", err)
return
}
}
if len(requestData.Module.Scope) < 1 || len(requestData.Module.Model) < 1 || len(requestData.Module.Scene) < 1 {
m.errMsg(ctx, "必传参数缺失", nil)
return
}
ctx.Values().Set("body_data", requestData)
ctx.Next()
}
}
func (m *Scenes) RegistryRouter(party iris.Party, prefix string) {
m.SetPrefix(prefix)
m.SetParty(party)
req := party.Post("/"+prefix, m.ParseRequest())
// 添加预处理程序
for _, handler := range m.GetPreHandler() {
req.Use(func(ctx iris.Context) {
resp := handler(ctx, ctx.Values().Get("body_data").(*RequestData))
resp.Return(ctx)
if resp.Err != nil {
return
}
ctx.Next()
})
}
// 主处理程序
req.Handlers = append(req.Handlers, func(ctx iris.Context) {
mapperBody := ctx.Values().Get("body_data").(*RequestData)
item, ok := m.GetItem(mapperBody.Module.Scope, mapperBody.Module.Model, mapperBody.Module.Scene)
if !ok {
m.errMsg(ctx, "获取对应handler失败", nil)
return
}
// 限速器实现
if item.rate != nil {
key, err := item.rateKey(ctx)
if err != nil {
m.errMsg(ctx, "获取限速器字段失败", err)
return
}
allow, err := item.rate.Allow(ctx, key)
if err != nil {
m.errMsg(ctx, "限速器执行失败", err)
return
}
if !allow {
m.errMsg(ctx, "当前请求过多,请稍后重试", nil, http.StatusTooManyRequests)
return
}
}
cloneItem := item.Scene.Clone()
cloneItem.SetMapper(mapperBody)
resp := cloneItem.GetHandler()(ctx, cloneItem)
resp.Return(ctx)
if resp.Err != nil {
return
}
ctx.Next()
})
// 添加后处理程序
for _, handler := range m.GetAfterHandler() {
req.Done(func(ctx iris.Context) {
resp := handler(ctx, ctx.Values().Get("body_data").(*RequestData))
resp.Return(ctx)
if resp.Err != nil {
return
}
ctx.Next()
})
}
}
func (m *Scenes) AddItemRate(scope string, model string, scene string, redisClient rueidiscompat.Cmdable, period time.Duration, maxCount int, interfaceKey string, keyFunc ScenesRateKeyFunc) error {
item, ok := m.GetItem(scope, model, scene)
if !ok {
return errors.New("未找到对应的scene")
}
item.rate = NewRateLimiter(redisClient, period, maxCount, interfaceKey)
item.rateKey = keyFunc
return nil
}
func NewScenes() IScenes {
return new(Scenes)
}