dubbo.apache.org/dubbo-go/v3@v3.1.1/xds/client/resource/errors.go (about) 1 /* 2 * Licensed to the Apache Software Foundation (ASF) under one or more 3 * contributor license agreements. See the NOTICE file distributed with 4 * this work for additional information regarding copyright ownership. 5 * The ASF licenses this file to You under the Apache License, Version 2.0 6 * (the "License"); you may not use this file except in compliance with 7 * the License. You may obtain a copy of the License at 8 * 9 * http://www.apache.org/licenses/LICENSE-2.0 10 * 11 * Unless required by applicable law or agreed to in writing, software 12 * distributed under the License is distributed on an "AS IS" BASIS, 13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 * See the License for the specific language governing permissions and 15 * limitations under the License. 16 */ 17 18 /* 19 * 20 * Copyright 2021 gRPC authors. 21 * 22 */ 23 24 package resource 25 26 import ( 27 "fmt" 28 ) 29 30 // ErrorType is the type of the error that the watcher will receive from the xds 31 // client. 32 type ErrorType int 33 34 const ( 35 // ErrorTypeUnknown indicates the error doesn't have a specific type. It is 36 // the default value, and is returned if the error is not an xds error. 37 ErrorTypeUnknown ErrorType = iota 38 // ErrorTypeConnection indicates a connection error from the gRPC client. 39 ErrorTypeConnection 40 // ErrorTypeResourceNotFound indicates a resource is not found from the xds 41 // response. It's typically returned if the resource is removed in the xds 42 // server. 43 ErrorTypeResourceNotFound 44 ) 45 46 type xdsClientError struct { 47 t ErrorType 48 desc string 49 } 50 51 func (e *xdsClientError) Error() string { 52 return e.desc 53 } 54 55 // NewErrorf creates an xds client error. The callbacks are called with this 56 // error, to pass additional information about the error. 57 func NewErrorf(t ErrorType, format string, args ...interface{}) error { 58 return &xdsClientError{t: t, desc: fmt.Sprintf(format, args...)} 59 } 60 61 // ErrType returns the error's type. 62 func ErrType(e error) ErrorType { 63 if xe, ok := e.(*xdsClientError); ok { 64 return xe.t 65 } 66 return ErrorTypeUnknown 67 }