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mayfly-go/server/pkg/req/req_ctx.go

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package req
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import (
"cmp"
"context"
"fmt"
"mayfly-go/pkg/biz"
"mayfly-go/pkg/contextx"
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"mayfly-go/pkg/errorx"
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"mayfly-go/pkg/i18n"
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"mayfly-go/pkg/logx"
"mayfly-go/pkg/model"
"mayfly-go/pkg/utils/assert"
"net/http"
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"time"
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)
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// 处理函数
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type HandlerFunc func(*Ctx)
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type Ctx struct {
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*wrapperF // http framework处理接口
Conf *Conf // 请求配置
ReqParam any // 请求参数,主要用于记录日志
ResData any // 响应结果
Error any // 请求错误
timed int64 // 执行时间
MetaCtx context.Context // 元数据上下文信息,如登录账号(只有校验token后才会有值)traceId等
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}
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func NewCtx(f F) *Ctx {
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metaCtx := contextx.WithTraceId(f.GetRequest().Context())
metaCtx = i18n.NewCtxWithLang(metaCtx, f.GetRequest().Header.Get("Accept-Language"))
ctx := &Ctx{MetaCtx: metaCtx}
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ctx.wrapperF = NewWrapperF(f)
return ctx
}
// 执行指定handler func并输出响应结果
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func (rc *Ctx) Handle(handler HandlerFunc) {
begin := time.Now()
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defer func() {
rc.timed = time.Since(begin).Milliseconds()
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if err := recover(); err != nil {
rc.Error = err
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}
// 应用所有请求后置处理器
ApplyHandlerInterceptor(afterHandlers, rc)
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// 输出响应结果
rc.res()
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}()
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assert.IsTrue(rc.wrapperF != nil, "F == nil")
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// 默认为不记录请求参数可在handler回调函数中覆盖赋值
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rc.ReqParam = nil
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// 默认响应结果为nil可在handler中赋值
rc.ResData = nil
// 调用请求前所有处理器
err := ApplyHandlerInterceptor(beforeHandlers, rc)
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if err != nil {
panic(err)
}
handler(rc)
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}
// 获取当前登录账号信息,不存在则会报错。
//
// 若不需要报错则使用contextx.GetLoginAccount方法
func (rc *Ctx) GetLoginAccount() *model.LoginAccount {
la := contextx.GetLoginAccount(rc.MetaCtx)
biz.IsTrue(la != nil, "获取登录账号信息失败, 请确认该接口是否通过鉴权")
return la
}
func (rc *Ctx) WithConf(conf *Conf) *Ctx {
rc.Conf = conf
return rc
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}
// 设置请求上下文需要的权限信息
func (rc *Ctx) WithRequiredPermission(permission *Permission) *Ctx {
if rc.Conf == nil {
rc.Conf = new(Conf)
}
rc.Conf.requiredPermission = permission
return rc
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}
// 设置请求日志信息
func (rc *Ctx) WithLog(logInfo *LogInfo) *Ctx {
if rc.Conf == nil {
rc.Conf = new(Conf)
}
rc.Conf.logInfo = logInfo
return rc
}
func (rc *Ctx) GetLogInfo() *LogInfo {
return rc.Conf.logInfo
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}
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// 输出响应结果
func (rc *Ctx) res() {
if err := rc.Error; err != nil {
switch t := err.(type) {
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case *errorx.BizError:
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rc.JSONRes(http.StatusOK, model.Error(t))
default:
logx.ErrorTrace("server error", t)
rc.JSONRes(http.StatusOK, model.ServerError(fmt.Sprintf("server error [%d-%s]", errorx.ServerError.Code(), cmp.Or(contextx.GetTraceId(rc.MetaCtx), "none"))))
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}
return
}
if rc.Conf == nil || !rc.Conf.noRes {
rc.JSONRes(http.StatusOK, model.Success(rc.ResData))
}
}
/************************************/
/***** GOLANG.ORG/X/NET/CONTEXT -> copy gin.Context *****/
/************************************/
// hasRequestContext returns whether c.Request has Context and fallback.
func (c *Ctx) hasRequestContext() bool {
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request := c.GetRequest()
return request != nil && request.Context() != nil
}
// Deadline returns that there is no deadline (ok==false) when c.Request has no Context.
func (c *Ctx) Deadline() (deadline time.Time, ok bool) {
if !c.hasRequestContext() {
return
}
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return c.GetRequest().Context().Deadline()
}
// Done returns nil (chan which will wait forever) when c.Request has no Context.
func (c *Ctx) Done() <-chan struct{} {
if !c.hasRequestContext() {
return nil
}
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return c.GetRequest().Context().Done()
}
// Err returns nil when c.Request has no Context.
func (c *Ctx) Err() error {
if !c.hasRequestContext() {
return nil
}
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return c.GetRequest().Context().Err()
}
// Value returns the value associated with this context for key, or nil
// if no value is associated with key. Successive calls to Value with
// the same key returns the same result.
func (c *Ctx) Value(key any) any {
if key == 0 {
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return c.GetRequest()
}
if !c.hasRequestContext() {
return nil
}
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return c.GetRequest().Context().Value(key)
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}
// 处理器拦截器函数
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type HandlerInterceptorFunc func(*Ctx) error
type HandlerInterceptors []HandlerInterceptorFunc
var (
beforeHandlers HandlerInterceptors
afterHandlers HandlerInterceptors
)
// 使用前置处理器函数
func UseBeforeHandlerInterceptor(b HandlerInterceptorFunc) {
beforeHandlers = append(beforeHandlers, b)
}
// 使用后置处理器函数
func UseAfterHandlerInterceptor(b HandlerInterceptorFunc) {
afterHandlers = append(afterHandlers, b)
}
// 应用指定处理器拦截器,如果有一个错误则直接返回错误
func ApplyHandlerInterceptor(his HandlerInterceptors, rc *Ctx) any {
for _, handler := range his {
if err := handler(rc); err != nil {
return err
}
}
return nil
}