144 lines
3.6 KiB
Go
144 lines
3.6 KiB
Go
/*
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Copyright 2014 CoreOS, Inc.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package stats
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import (
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"encoding/json"
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"log"
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"sync"
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"time"
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"github.com/coreos/etcd/raft"
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)
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// ServerStats encapsulates various statistics about an EtcdServer and its
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// communication with other members of the cluster
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type ServerStats struct {
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Name string `json:"name"`
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// TODO(jonboulle): use ID instead of name?
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ID string `json:"id"`
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State raft.StateType `json:"state"`
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StartTime time.Time `json:"startTime"`
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LeaderInfo struct {
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Name string `json:"leader"`
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Uptime string `json:"uptime"`
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StartTime time.Time `json:"startTime"`
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} `json:"leaderInfo"`
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RecvAppendRequestCnt uint64 `json:"recvAppendRequestCnt,"`
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RecvingPkgRate float64 `json:"recvPkgRate,omitempty"`
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RecvingBandwidthRate float64 `json:"recvBandwidthRate,omitempty"`
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SendAppendRequestCnt uint64 `json:"sendAppendRequestCnt"`
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SendingPkgRate float64 `json:"sendPkgRate,omitempty"`
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SendingBandwidthRate float64 `json:"sendBandwidthRate,omitempty"`
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sendRateQueue *statsQueue
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recvRateQueue *statsQueue
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sync.Mutex
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}
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func (ss *ServerStats) JSON() []byte {
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ss.Lock()
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stats := *ss
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ss.Unlock()
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stats.LeaderInfo.Uptime = time.Now().Sub(stats.LeaderInfo.StartTime).String()
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stats.SendingPkgRate, stats.SendingBandwidthRate = stats.SendRates()
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stats.RecvingPkgRate, stats.RecvingBandwidthRate = stats.RecvRates()
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b, err := json.Marshal(stats)
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// TODO(jonboulle): appropriate error handling?
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if err != nil {
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log.Printf("error marshalling server stats: %v", err)
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}
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return b
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}
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// Initialize clears the statistics of ServerStats and resets its start time
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func (ss *ServerStats) Initialize() {
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if ss == nil {
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return
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}
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now := time.Now()
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ss.StartTime = now
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ss.LeaderInfo.StartTime = now
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ss.sendRateQueue = &statsQueue{
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back: -1,
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}
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ss.recvRateQueue = &statsQueue{
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back: -1,
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}
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}
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// RecvRates calculates and returns the rate of received append requests
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func (ss *ServerStats) RecvRates() (float64, float64) {
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return ss.recvRateQueue.Rate()
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}
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// SendRates calculates and returns the rate of sent append requests
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func (ss *ServerStats) SendRates() (float64, float64) {
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return ss.sendRateQueue.Rate()
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}
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// RecvAppendReq updates the ServerStats in response to an AppendRequest
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// from the given leader being received
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func (ss *ServerStats) RecvAppendReq(leader string, reqSize int) {
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ss.Lock()
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defer ss.Unlock()
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now := time.Now()
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ss.State = raft.StateFollower
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if leader != ss.LeaderInfo.Name {
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ss.LeaderInfo.Name = leader
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ss.LeaderInfo.StartTime = now
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}
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ss.recvRateQueue.Insert(
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&RequestStats{
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SendingTime: now,
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Size: reqSize,
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},
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)
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ss.RecvAppendRequestCnt++
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}
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// SendAppendReq updates the ServerStats in response to an AppendRequest
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// being sent by this server
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func (ss *ServerStats) SendAppendReq(reqSize int) {
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ss.Lock()
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defer ss.Unlock()
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now := time.Now()
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if ss.State != raft.StateLeader {
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ss.State = raft.StateLeader
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ss.LeaderInfo.Name = ss.ID
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ss.LeaderInfo.StartTime = now
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}
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ss.sendRateQueue.Insert(
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&RequestStats{
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SendingTime: now,
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Size: reqSize,
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},
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)
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ss.SendAppendRequestCnt++
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}
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