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// Copyright 2017 Canonical Ltd.
//
// 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 network
import (
"fmt"
"strings"
"github.com/hashicorp/raft"
)
// Return a string representation of the given log entries.
func stringifyLogs(logs []*raft.Log) string {
n := len(logs)
description := fmt.Sprintf("%d ", n)
if n == 1 {
description += "entry"
} else {
description += "entries"
}
if n > 0 {
entries := make([]string, n)
for i, log := range logs {
name := "Other"
switch log.Type {
case raft.LogCommand:
name = "Command"
case raft.LogNoop:
name = "Noop"
}
entries[i] = fmt.Sprintf("%s:term=%d,index=%d", name, log.Term, log.Index)
}
description += fmt.Sprintf(" [%s]", strings.Join(entries, " "))
}
return description
}
// This function takes a set of log entries that have been successfully
// appended to a peer and filters out any log entry with an older term relative
// to the others.
//
// The returned entries are guaranted to have the same term and that term is
// the highest among the ones in this batch.
func filterLogsWithOlderTerms(logs []*raft.Log) []*raft.Log {
// Find the highest term.
var highestTerm uint64
for _, log := range logs {
if log.Term > highestTerm {
highestTerm = log.Term
}
}
// Discard any log with an older term than the highest one.
filteredLogs := make([]*raft.Log, 0)
for _, log := range logs {
if log.Term == highestTerm {
filteredLogs = append(filteredLogs, log)
}
}
return filteredLogs
}
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