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recover.go
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recover.go
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// MIT License
// Copyright (c) 2020 Tree Xie
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.
package middleware
import (
"fmt"
"net/http"
"strings"
"github.com/vicanso/elton"
"github.com/vicanso/hes"
)
const (
// ErrRecoverCategory recover error category
ErrRecoverCategory = "elton-recover"
)
// NewRecover return a recover middleware, it can recover from panic,
// and then emit an `elton-recover` error.
// Suggest to graceful close the elton instance for recover error.
func NewRecover() elton.Handler {
return func(c *elton.Context) error {
defer func() {
// 可针对实际需求调整,如对于每个recover增加邮件通知等
if r := recover(); r != nil {
err, ok := r.(error)
if !ok {
err = fmt.Errorf("%v", r)
}
he := hes.Wrap(err)
he.Category = ErrRecoverCategory
he.StatusCode = http.StatusInternalServerError
err = he
c.Elton().EmitError(c, err)
// 出错时清除部分响应头
for _, key := range []string{
elton.HeaderETag,
elton.HeaderLastModified,
elton.HeaderContentEncoding,
elton.HeaderContentLength,
} {
c.SetHeader(key, "")
}
// 直接对Response写入数据,则将 Committed设置为 true
c.Committed = true
resp := c.Response
buf := []byte(err.Error())
if strings.Contains(c.GetRequestHeader("Accept"), "application/json") {
c.SetHeader(elton.HeaderContentType, elton.MIMEApplicationJSON)
buf = he.ToJSON()
}
resp.WriteHeader(he.StatusCode)
_, err = resp.Write(buf)
if err != nil {
c.Elton().EmitError(c, err)
}
}
}()
return c.Next()
}
}