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// Copyright (c) The go-grpc-middleware Authors.
// Licensed under the Apache License 2.0.
// Copyright 2017 David Ackroyd. All Rights Reserved.
// See LICENSE for licensing terms.
package recovery
import (
"context"
"fmt"
"runtime"
"google.golang.org/grpc"
)
// RecoveryHandlerFunc is a function that recovers from the panic `p` by returning an `error`.
type RecoveryHandlerFunc func(p any) (err error)
// RecoveryHandlerFuncContext is a function that recovers from the panic `p` by returning an `error`.
// The context can be used to extract request scoped metadata and context values.
type RecoveryHandlerFuncContext func(ctx context.Context, p any) (err error)
// UnaryServerInterceptor returns a new unary server interceptor for panic recovery.
func UnaryServerInterceptor(opts ...Option) grpc.UnaryServerInterceptor {
o := evaluateOptions(opts)
return func(ctx context.Context, req any, info *grpc.UnaryServerInfo, handler grpc.UnaryHandler) (_ any, err error) {
defer func() {
if r := recover(); r != nil {
err = recoverFrom(ctx, r, o.recoveryHandlerFunc)
}
}()
return handler(ctx, req)
}
}
// StreamServerInterceptor returns a new streaming server interceptor for panic recovery.
func StreamServerInterceptor(opts ...Option) grpc.StreamServerInterceptor {
o := evaluateOptions(opts)
return func(srv any, stream grpc.ServerStream, info *grpc.StreamServerInfo, handler grpc.StreamHandler) (err error) {
defer func() {
if r := recover(); r != nil {
err = recoverFrom(stream.Context(), r, o.recoveryHandlerFunc)
}
}()
return handler(srv, stream)
}
}
func recoverFrom(ctx context.Context, p any, r RecoveryHandlerFuncContext) error {
if r != nil {
return r(ctx, p)
}
stack := make([]byte, 64<<10)
stack = stack[:runtime.Stack(stack, false)]
return &PanicError{Panic: p, Stack: stack}
}
type PanicError struct {
Panic any
Stack []byte
}
func (e *PanicError) Error() string {
return fmt.Sprintf("panic caught: %v\n\n%s", e.Panic, e.Stack)
}
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