/*
* Copyright 2022-present Open Networking Foundation
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
 */

// Package vpagent Common Logger initialization
package vpagent

import (
	"context"
	"strings"

	"google.golang.org/grpc/codes"
	"google.golang.org/grpc/status"
)

// IsConnCanceled returns true, if error is from a closed gRPC connection.
// ref. https://github.com/grpc/grpc-go/pull/1854
func isConnCanceled(err error) bool {
	if err == nil {
		return false
	}
	// >= gRPC v1.23.x
	s, ok := status.FromError(err)
	if ok {
		// connection is canceled or server has already closed the connection
		return s.Code() == codes.Canceled || s.Message() == "transport is closing"
	}

	e, ok := status.FromError(err)
	if ok {
		// connection is canceled or server has already closed the connection
		return e.Code() == codes.Canceled || e.Message() == "all SubConns are in TransientFailure"
	}

	// >= gRPC v1.10.x
	if err == context.Canceled {
		return true
	}

	// <= gRPC v1.7.x returns 'errors.New("grpc: the client connection is closing")'
	return strings.Contains(err.Error(), "grpc: the client connection is closing")
}