59 lines
1.7 KiB
Go
59 lines
1.7 KiB
Go
package recovery
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import (
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"context"
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"net/http"
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"runtime"
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"github.com/traefik/traefik/v2/pkg/log"
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"github.com/traefik/traefik/v2/pkg/middlewares"
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)
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const (
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typeName = "Recovery"
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middlewareName = "traefik-internal-recovery"
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)
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type recovery struct {
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next http.Handler
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}
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// New creates recovery middleware.
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func New(ctx context.Context, next http.Handler) (http.Handler, error) {
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log.FromContext(middlewares.GetLoggerCtx(ctx, middlewareName, typeName)).Debug("Creating middleware")
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return &recovery{
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next: next,
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}, nil
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}
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func (re *recovery) ServeHTTP(rw http.ResponseWriter, req *http.Request) {
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defer recoverFunc(rw, req)
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re.next.ServeHTTP(rw, req)
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}
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func recoverFunc(rw http.ResponseWriter, r *http.Request) {
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if err := recover(); err != nil {
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logger := log.FromContext(middlewares.GetLoggerCtx(r.Context(), middlewareName, typeName))
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if !shouldLogPanic(err) {
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logger.Debugf("Request has been aborted [%s - %s]: %v", r.RemoteAddr, r.URL, err)
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return
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}
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logger.Errorf("Recovered from panic in HTTP handler [%s - %s]: %+v", r.RemoteAddr, r.URL, err)
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const size = 64 << 10
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buf := make([]byte, size)
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buf = buf[:runtime.Stack(buf, false)]
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logger.Errorf("Stack: %s", buf)
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http.Error(rw, http.StatusText(http.StatusInternalServerError), http.StatusInternalServerError)
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}
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}
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// https://github.com/golang/go/blob/a0d6420d8be2ae7164797051ec74fa2a2df466a1/src/net/http/server.go#L1761-L1775
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// https://github.com/golang/go/blob/c33153f7b416c03983324b3e8f869ce1116d84bc/src/net/http/httputil/reverseproxy.go#L284
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func shouldLogPanic(panicValue interface{}) bool {
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//nolint:errorlint // false-positive because panicValue is an interface.
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return panicValue != nil && panicValue != http.ErrAbortHandler
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}
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