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// Copyright 2015 The etcd Authors
//
// 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 etcdserver
import (
"fmt"
"reflect"
"strings"
"time"
pb "github.com/coreos/etcd/etcdserver/etcdserverpb"
"github.com/coreos/etcd/etcdserver/membership"
"github.com/coreos/etcd/pkg/types"
"github.com/coreos/etcd/rafthttp"
"github.com/golang/protobuf/proto"
)
// isConnectedToQuorumSince checks whether the local member is connected to the
// quorum of the cluster since the given time.
func isConnectedToQuorumSince(transport rafthttp.Transporter, since time.Time, self types.ID, members []*membership.Member) bool {
return numConnectedSince(transport, since, self, members) >= (len(members)/2)+1
}
// isConnectedSince checks whether the local member is connected to the
// remote member since the given time.
func isConnectedSince(transport rafthttp.Transporter, since time.Time, remote types.ID) bool {
t := transport.ActiveSince(remote)
return !t.IsZero() && t.Before(since)
}
// isConnectedFullySince checks whether the local member is connected to all
// members in the cluster since the given time.
func isConnectedFullySince(transport rafthttp.Transporter, since time.Time, self types.ID, members []*membership.Member) bool {
return numConnectedSince(transport, since, self, members) == len(members)
}
// numConnectedSince counts how many members are connected to the local member
// since the given time.
func numConnectedSince(transport rafthttp.Transporter, since time.Time, self types.ID, members []*membership.Member) int {
connectedNum := 0
for _, m := range members {
if m.ID == self || isConnectedSince(transport, since, m.ID) {
connectedNum++
}
}
return connectedNum
}
// longestConnected chooses the member with longest active-since-time.
// It returns false, if nothing is active.
func longestConnected(tp rafthttp.Transporter, membs []types.ID) (types.ID, bool) {
var longest types.ID
var oldest time.Time
for _, id := range membs {
tm := tp.ActiveSince(id)
if tm.IsZero() { // inactive
continue
}
if oldest.IsZero() { // first longest candidate
oldest = tm
longest = id
}
if tm.Before(oldest) {
oldest = tm
longest = id
}
}
if uint64(longest) == 0 {
return longest, false
}
return longest, true
}
type notifier struct {
c chan struct{}
err error
}
func newNotifier() *notifier {
return ¬ifier{
c: make(chan struct{}),
}
}
func (nc *notifier) notify(err error) {
nc.err = err
close(nc.c)
}
func warnOfExpensiveRequest(now time.Time, reqStringer fmt.Stringer, respMsg proto.Message, err error) {
var resp string
if !isNil(respMsg) {
resp = fmt.Sprintf("size:%d", proto.Size(respMsg))
}
warnOfExpensiveGenericRequest(now, reqStringer, "", resp, err)
}
func warnOfExpensiveReadOnlyTxnRequest(now time.Time, r *pb.TxnRequest, txnResponse *pb.TxnResponse, err error) {
reqStringer := pb.NewLoggableTxnRequest(r)
var resp string
if !isNil(txnResponse) {
var resps []string
for _, r := range txnResponse.Responses {
switch op := r.Response.(type) {
case *pb.ResponseOp_ResponseRange:
resps = append(resps, fmt.Sprintf("range_response_count:%d", len(op.ResponseRange.Kvs)))
default:
// only range responses should be in a read only txn request
}
}
resp = fmt.Sprintf("responses:<%s> size:%d", strings.Join(resps, " "), proto.Size(txnResponse))
}
warnOfExpensiveGenericRequest(now, reqStringer, "read-only range ", resp, err)
}
func warnOfExpensiveReadOnlyRangeRequest(now time.Time, reqStringer fmt.Stringer, rangeResponse *pb.RangeResponse, err error) {
var resp string
if !isNil(rangeResponse) {
resp = fmt.Sprintf("range_response_count:%d size:%d", len(rangeResponse.Kvs), proto.Size(rangeResponse))
}
warnOfExpensiveGenericRequest(now, reqStringer, "read-only range ", resp, err)
}
func warnOfExpensiveGenericRequest(now time.Time, reqStringer fmt.Stringer, prefix string, resp string, err error) {
// TODO: add metrics
d := time.Since(now)
if d > warnApplyDuration {
var result string
if err != nil {
result = fmt.Sprintf("error:%v", err)
} else {
result = resp
}
plog.Warningf("%srequest %q with result %q took too long (%v) to execute", prefix, reqStringer.String(), result, d)
slowApplies.Inc()
}
}
func isNil(msg proto.Message) bool {
return msg == nil || reflect.ValueOf(msg).IsNil()
}
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