// revive:disable:var-naming

// Package grpc_sentry provides a middleware to send an error to Sentry
package grpc_sentry

// revive:enable:var-naming

import (
	"context"

	raven "github.com/getsentry/raven-go"
	grpc_middleware "github.com/grpc-ecosystem/go-grpc-middleware"
	"github.com/pingcap/errcode"
	"github.com/pingcap/errors"
	"google.golang.org/grpc"
	"google.golang.org/grpc/codes"
	"google.golang.org/grpc/status"
)

func isInternalError(code codes.Code) bool {
	switch code {
	case codes.Unknown, codes.Aborted, codes.Unimplemented, codes.Unavailable, codes.Internal, codes.DataLoss:
		return true
	}
	return false
}

func errorHandler(err error) error {
	if err == nil {
		return nil
	}

	if isInternalError(status.Code(err)) {
		// raven does not recurse to find the stack trace, so do that here
		if errors.HasStack(err) {
			// NewInternalErr will surface the stack trace
			raven.CaptureError(errcode.NewInternalErr(err), nil)
		} else {
			raven.CaptureError(err, nil)
		}
	}
	return err
}

// UnaryServerInterceptor returns a new unary server interceptors that sends errors to Sentry
func UnaryServerInterceptor() grpc.UnaryServerInterceptor {
	return func(ctx context.Context, req interface{}, info *grpc.UnaryServerInfo, handler grpc.UnaryHandler) (interface{}, error) {
		resp, err := handler(ctx, req)
		return resp, errorHandler(err)
	}
}

// StreamServerInterceptor returns a new streaming server interceptor that that sends errors to Sentry
func StreamServerInterceptor() grpc.StreamServerInterceptor {
	return func(srv interface{}, stream grpc.ServerStream, info *grpc.StreamServerInfo, handler grpc.StreamHandler) error {
		wrapped := grpc_middleware.WrapServerStream(stream)
		err := handler(srv, wrapped)
		return errorHandler(err)
	}
}