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// Copyright 2024 syzkaller project authors. All rights reserved.
// Use of this source code is governed by Apache 2 LICENSE that can be found in the LICENSE file.
package queue
import (
"fmt"
)
type retryer struct {
pq *PlainQueue
base Source
}
// Retry adds a layer that resends results with Status=Restarted.
func Retry(base Source) Source {
return &retryer{
base: base,
pq: Plain(),
}
}
func (r *retryer) Next() *Request {
req := r.pq.tryNext()
if req == nil {
req = r.base.Next()
}
if req != nil {
req.OnDone(r.done)
}
return req
}
func (r *retryer) done(req *Request, res *Result) bool {
switch res.Status {
case Success, ExecFailure, Hanged:
return true
case Restarted:
// The input was on a restarted VM.
r.pq.Submit(req)
return false
case Crashed:
// Retry important requests from crashed VMs once.
if req.Important && !req.onceCrashed {
req.onceCrashed = true
r.pq.Submit(req)
return false
}
return true
default:
panic(fmt.Sprintf("unhandled status %v", res.Status))
}
}
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