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reasonmap.go
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reasonmap.go
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// Copyright 2020 DataStax
//
// 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 primitive
import (
"fmt"
"io"
"net"
)
// <reasonmap> is a map of endpoint to failure reason codes, available from Protocol Version 5 onwards.
// The map is encoded starting with an [int] n followed by n pairs of <endpoint><failurecode> where
// <endpoint> is an [inetaddr] and <failurecode> is a [short].
// Note: a reasonmap is inherently a map, but it is not modeled as a map in Go because [inetaddr]
// is not a valid map key type.
// FailureReason is a map entry for a <reasonmap>; it contains the endpoint that failed and the corresponding failure
// code.
// +k8s:deepcopy-gen=true
type FailureReason struct {
Endpoint net.IP
Code FailureCode
}
func ReadReasonMap(source io.Reader) ([]*FailureReason, error) {
if length, err := ReadInt(source); err != nil {
return nil, fmt.Errorf("cannot read reason map length: %w", err)
} else {
reasonMap := make([]*FailureReason, length)
for i := 0; i < int(length); i++ {
if addr, err := ReadInetAddr(source); err != nil {
return nil, fmt.Errorf("cannot read reason map key for element %d: %w", i, err)
} else if code, err := ReadShort(source); err != nil {
return nil, fmt.Errorf("cannot read reason map value for element %d: %w", i, err)
} else if err := CheckValidFailureCode(FailureCode(code)); err != nil {
return nil, err
} else {
reasonMap[i] = &FailureReason{addr, FailureCode(code)}
}
}
return reasonMap, err
}
}
func WriteReasonMap(reasonMap []*FailureReason, dest io.Writer) error {
if err := WriteInt(int32(len(reasonMap)), dest); err != nil {
return fmt.Errorf("cannot write reason map length: %w", err)
}
for i, reason := range reasonMap {
if err := WriteInetAddr(reason.Endpoint, dest); err != nil {
return fmt.Errorf("cannot write reason map key for element %d: %w", i, err)
} else if err := CheckValidFailureCode(reason.Code); err != nil {
return err
} else if err = WriteShort(uint16(reason.Code), dest); err != nil {
return fmt.Errorf("cannot write reason map value for element %d: %w", i, err)
}
}
return nil
}
func LengthOfReasonMap(reasonMap []*FailureReason) (int, error) {
length := LengthOfInt
for i, reason := range reasonMap {
if inetAddrLength, err := LengthOfInetAddr(reason.Endpoint); err != nil {
return -1, fmt.Errorf("cannot compute length of reason map key for element %d: %w", i, err)
} else {
length += inetAddrLength + LengthOfShort
}
}
return length, nil
}