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recover.go
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recover.go
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package filter
import (
"runtime"
"sync"
"github.com/cuigh/auxo/errors"
"github.com/cuigh/auxo/net/web"
)
type Recover struct {
// StackSize is max size of the stack to be logged.
// Optional. Default value 4KB.
StackSize int `json:"stack_size"`
// StackEnabled enables logging stack trace.
// Optional. Default value is true.
StackEnabled bool `json:"stack_enabled"`
}
// NewRecover returns a Recover instance.
func NewRecover() *Recover {
return &Recover{
StackEnabled: true,
}
}
// Apply implements `web.Filter` interface.
func (r *Recover) Apply(next web.HandlerFunc) web.HandlerFunc {
if r.StackSize == 0 {
r.StackSize = 4 << 10 // 4 KB
}
pool := sync.Pool{
New: func() interface{} {
return make([]byte, r.StackSize)
},
}
return func(ctx web.Context) error {
defer func() {
if e := recover(); e != nil {
err := errors.Convert(e)
if r.StackEnabled {
stack := pool.Get().([]byte)
length := runtime.Stack(stack, false)
ctx.Logger().Errorf("PANIC: %s, stack: %s", err, stack[:length])
pool.Put(stack)
}
ctx.Error(err)
}
}()
return next(ctx)
}
}