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minio/cmd/admin-rpc-client.go

261 lines
7.1 KiB

/*
* Minio Cloud Storage, (C) 2014, 2015, 2016, 2017, 2018 Minio, Inc.
*
* 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 cmd
import (
"context"
"crypto/tls"
"fmt"
"net"
"sort"
"strings"
"sync"
"time"
"github.com/minio/minio/cmd/logger"
xnet "github.com/minio/minio/pkg/net"
)
var errUnsupportedSignal = fmt.Errorf("unsupported signal: only restart and stop signals are supported")
// AdminRPCClient - admin RPC client talks to admin RPC server.
type AdminRPCClient struct {
*RPCClient
}
// SignalService - calls SignalService RPC.
func (rpcClient *AdminRPCClient) SignalService(signal serviceSignal) (err error) {
args := SignalServiceArgs{Sig: signal}
reply := VoidReply{}
return rpcClient.Call(adminServiceName+".SignalService", &args, &reply)
}
// ServerInfo - returns the server info of the server to which the RPC call is made.
func (rpcClient *AdminRPCClient) ServerInfo() (sid ServerInfoData, err error) {
err = rpcClient.Call(adminServiceName+".ServerInfo", &AuthArgs{}, &sid)
return sid, err
}
// StartProfiling - starts profiling in the remote server.
func (rpcClient *AdminRPCClient) StartProfiling(profiler string) error {
args := StartProfilingArgs{Profiler: profiler}
reply := VoidReply{}
return rpcClient.Call(adminServiceName+".StartProfiling", &args, &reply)
}
// DownloadProfilingData - returns profiling data of the remote server.
func (rpcClient *AdminRPCClient) DownloadProfilingData() ([]byte, error) {
args := AuthArgs{}
var reply []byte
err := rpcClient.Call(adminServiceName+".DownloadProfilingData", &args, &reply)
return reply, err
}
// NewAdminRPCClient - returns new admin RPC client.
func NewAdminRPCClient(host *xnet.Host) (*AdminRPCClient, error) {
scheme := "http"
if globalIsSSL {
scheme = "https"
}
serviceURL := &xnet.URL{
Scheme: scheme,
Host: host.String(),
Path: adminServicePath,
}
var tlsConfig *tls.Config
if globalIsSSL {
tlsConfig = &tls.Config{
ServerName: host.Name,
RootCAs: globalRootCAs,
}
}
rpcClient, err := NewRPCClient(
RPCClientArgs{
NewAuthTokenFunc: newAuthToken,
RPCVersion: globalRPCAPIVersion,
ServiceName: adminServiceName,
ServiceURL: serviceURL,
TLSConfig: tlsConfig,
},
)
if err != nil {
return nil, err
}
return &AdminRPCClient{rpcClient}, nil
}
// adminCmdRunner - abstracts local and remote execution of admin
// commands like service stop and service restart.
type adminCmdRunner interface {
SignalService(s serviceSignal) error
ServerInfo() (ServerInfoData, error)
StartProfiling(string) error
DownloadProfilingData() ([]byte, error)
}
// adminPeer - represents an entity that implements admin API RPCs.
type adminPeer struct {
addr string
cmdRunner adminCmdRunner
isLocal bool
}
// type alias for a collection of adminPeer.
type adminPeers []adminPeer
// makeAdminPeers - helper function to construct a collection of adminPeer.
func makeAdminPeers(endpoints EndpointList) (adminPeerList adminPeers) {
localAddr := GetLocalPeer(endpoints)
if strings.HasPrefix(localAddr, "127.0.0.1:") {
// Use first IPv4 instead of loopback address.
localAddr = net.JoinHostPort(sortIPs(localIP4.ToSlice())[0], globalMinioPort)
}
if strings.HasPrefix(localAddr, "[::1]:") {
// Use first IPv4 instead of loopback address.
localAddr = net.JoinHostPort(localIP6.ToSlice()[0], globalMinioPort)
}
adminPeerList = append(adminPeerList, adminPeer{
addr: localAddr,
cmdRunner: localAdminClient{},
isLocal: true,
})
for _, hostStr := range GetRemotePeers(endpoints) {
host, err := xnet.ParseHost(hostStr)
logger.FatalIf(err, "Unable to parse Admin RPC Host")
rpcClient, err := NewAdminRPCClient(host)
logger.FatalIf(err, "Unable to initialize Admin RPC Client")
adminPeerList = append(adminPeerList, adminPeer{
addr: hostStr,
cmdRunner: rpcClient,
})
}
return adminPeerList
}
// Initialize global adminPeer collection.
func initGlobalAdminPeers(endpoints EndpointList) {
globalAdminPeers = makeAdminPeers(endpoints)
}
// invokeServiceCmd - Invoke Restart/Stop command.
func invokeServiceCmd(cp adminPeer, cmd serviceSignal) (err error) {
switch cmd {
case serviceRestart, serviceStop:
err = cp.cmdRunner.SignalService(cmd)
}
return err
}
// sendServiceCmd - Invoke Restart command on remote peers
// adminPeer followed by on the local peer.
func sendServiceCmd(cps adminPeers, cmd serviceSignal) {
// Send service command like stop or restart to all remote nodes and finally run on local node.
errs := make([]error, len(cps))
var wg sync.WaitGroup
remotePeers := cps[1:]
for i := range remotePeers {
wg.Add(1)
go func(idx int) {
defer wg.Done()
// we use idx+1 because remotePeers slice is 1 position shifted w.r.t cps
errs[idx+1] = invokeServiceCmd(remotePeers[idx], cmd)
}(i)
}
wg.Wait()
errs[0] = invokeServiceCmd(cps[0], cmd)
}
// uptimeSlice - used to sort uptimes in chronological order.
type uptimeSlice []struct {
err error
uptime time.Duration
}
func (ts uptimeSlice) Len() int {
return len(ts)
}
func (ts uptimeSlice) Less(i, j int) bool {
return ts[i].uptime < ts[j].uptime
}
func (ts uptimeSlice) Swap(i, j int) {
ts[i], ts[j] = ts[j], ts[i]
}
// getPeerUptimes - returns the uptime since the last time read quorum
// was established on success. Otherwise returns errXLReadQuorum.
func getPeerUptimes(peers adminPeers) (time.Duration, error) {
// In a single node Erasure or FS backend setup the uptime of
// the setup is the uptime of the single minio server
// instance.
if !globalIsDistXL {
return UTCNow().Sub(globalBootTime), nil
}
uptimes := make(uptimeSlice, len(peers))
// Get up time of all servers.
wg := sync.WaitGroup{}
for i, peer := range peers {
wg.Add(1)
go func(idx int, peer adminPeer) {
defer wg.Done()
serverInfoData, rpcErr := peer.cmdRunner.ServerInfo()
uptimes[idx].uptime, uptimes[idx].err = serverInfoData.Properties.Uptime, rpcErr
}(i, peer)
}
wg.Wait()
// Sort uptimes in chronological order.
sort.Sort(uptimes)
// Pick the readQuorum'th uptime in chronological order. i.e,
// the time at which read quorum was (re-)established.
readQuorum := len(uptimes) / 2
validCount := 0
latestUptime := time.Duration(0)
for _, uptime := range uptimes {
if uptime.err != nil {
logger.LogIf(context.Background(), uptime.err)
continue
}
validCount++
if validCount >= readQuorum {
latestUptime = uptime.uptime
break
}
}
// Less than readQuorum "Admin.Uptime" RPC call returned
// successfully, so read-quorum unavailable.
if validCount < readQuorum {
return time.Duration(0), InsufficientReadQuorum{}
}
return latestUptime, nil
}