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middleware.go
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middleware.go
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package replay
import (
"net/http"
"time"
)
// Middleware allows us to wrap http.Handler to be retried
// this is useful for building robust proxies
type Middleware struct {
retries int
period time.Duration
handler http.Handler
ErrorHandler func(rw http.ResponseWriter, req *http.Request, err error)
}
// NewMiddleware
func NewMiddleware(retries int, period time.Duration, handler http.Handler) *Middleware {
return &Middleware{
retries: retries,
period: period,
handler: handler,
}
}
func (m *Middleware) ServeHTTP(rw http.ResponseWriter, req *http.Request) {
replayer, err := NewReplayer(req, rw)
if err != nil {
return
}
err = retryWait(func() error {
newReq, err := replayer.Replay()
if err != nil {
return err
}
m.handler.ServeHTTP(replayer, newReq)
if err := replayer.GetError(); err != nil {
replayer.Stop()
return err
}
return nil
}, m.retries, m.period)
if err != nil {
if m.ErrorHandler != nil {
m.ErrorHandler(rw, req, err)
} else {
defaultErrorHandler(rw, req, err)
}
}
}
func defaultErrorHandler(rw http.ResponseWriter, req *http.Request, err error) {
http.Error(rw, err.Error(), http.StatusInternalServerError)
}