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minio/cmd/bootstrap-peer-server.go

258 lines
7.5 KiB

/*
* MinIO Cloud Storage, (C) 2019 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"
"encoding/json"
"fmt"
"io"
"net/http"
"net/url"
"runtime"
"sync/atomic"
"time"
"github.com/gorilla/mux"
"github.com/minio/minio-go/pkg/set"
xhttp "github.com/minio/minio/cmd/http"
"github.com/minio/minio/cmd/logger"
"github.com/minio/minio/cmd/rest"
)
const (
bootstrapRESTVersion = "v1"
bootstrapRESTVersionPrefix = SlashSeparator + bootstrapRESTVersion
bootstrapRESTPrefix = minioReservedBucketPath + "/bootstrap"
bootstrapRESTPath = bootstrapRESTPrefix + bootstrapRESTVersionPrefix
)
const (
bootstrapRESTMethodVerify = "/verify"
)
// To abstract a node over network.
type bootstrapRESTServer struct{}
// ServerSystemConfig - captures information about server configuration.
type ServerSystemConfig struct {
MinioPlatform string
MinioRuntime string
MinioEndpoints EndpointZones
}
// Diff - returns error on first difference found in two configs.
func (s1 ServerSystemConfig) Diff(s2 ServerSystemConfig) error {
if s1.MinioPlatform != s2.MinioPlatform {
return fmt.Errorf("Expected platform '%s', found to be running '%s'",
s1.MinioPlatform, s2.MinioPlatform)
}
if s1.MinioEndpoints.Nodes() != s2.MinioEndpoints.Nodes() {
return fmt.Errorf("Expected number of endpoints %d, seen %d", s1.MinioEndpoints.Nodes(),
s2.MinioEndpoints.Nodes())
}
for i, ep := range s1.MinioEndpoints {
if ep.SetCount != s2.MinioEndpoints[i].SetCount {
return fmt.Errorf("Expected set count %d, seen %d", ep.SetCount,
s2.MinioEndpoints[i].SetCount)
}
if ep.DrivesPerSet != s2.MinioEndpoints[i].DrivesPerSet {
return fmt.Errorf("Expected drives pet set %d, seen %d", ep.DrivesPerSet,
s2.MinioEndpoints[i].DrivesPerSet)
}
for j, endpoint := range ep.Endpoints {
if endpoint.String() != s2.MinioEndpoints[i].Endpoints[j].String() {
return fmt.Errorf("Expected endpoint %s, seen %s", endpoint,
s2.MinioEndpoints[i].Endpoints[j])
}
}
}
return nil
}
func getServerSystemCfg() ServerSystemConfig {
return ServerSystemConfig{
MinioPlatform: fmt.Sprintf("OS: %s | Arch: %s", runtime.GOOS, runtime.GOARCH),
MinioEndpoints: globalEndpoints,
}
}
func (b *bootstrapRESTServer) VerifyHandler(w http.ResponseWriter, r *http.Request) {
ctx := newContext(r, w, "VerifyHandler")
cfg := getServerSystemCfg()
logger.LogIf(ctx, json.NewEncoder(w).Encode(&cfg))
w.(http.Flusher).Flush()
}
// registerBootstrapRESTHandlers - register bootstrap rest router.
func registerBootstrapRESTHandlers(router *mux.Router) {
server := &bootstrapRESTServer{}
subrouter := router.PathPrefix(bootstrapRESTPrefix).Subrouter()
subrouter.Methods(http.MethodPost).Path(bootstrapRESTVersionPrefix + bootstrapRESTMethodVerify).HandlerFunc(
httpTraceHdrs(server.VerifyHandler))
}
// client to talk to bootstrap Nodes.
type bootstrapRESTClient struct {
endpoint Endpoint
restClient *rest.Client
connected int32
}
// Reconnect to a bootstrap rest server.k
func (client *bootstrapRESTClient) reConnect() {
atomic.StoreInt32(&client.connected, 1)
}
// Wrapper to restClient.Call to handle network errors, in case of network error the connection is marked disconnected
// permanently. The only way to restore the connection is at the xl-sets layer by xlsets.monitorAndConnectEndpoints()
// after verifying format.json
func (client *bootstrapRESTClient) call(method string, values url.Values, body io.Reader, length int64) (respBody io.ReadCloser, err error) {
return client.callWithContext(context.Background(), method, values, body, length)
}
// Wrapper to restClient.Call to handle network errors, in case of network error the connection is marked disconnected
// permanently. The only way to restore the connection is at the xl-sets layer by xlsets.monitorAndConnectEndpoints()
// after verifying format.json
func (client *bootstrapRESTClient) callWithContext(ctx context.Context, method string, values url.Values, body io.Reader, length int64) (respBody io.ReadCloser, err error) {
if !client.IsOnline() {
client.reConnect()
}
if values == nil {
values = make(url.Values)
}
respBody, err = client.restClient.CallWithContext(ctx, method, values, body, length)
if err == nil {
return respBody, nil
}
if isNetworkError(err) {
atomic.StoreInt32(&client.connected, 0)
}
return nil, err
}
// Stringer provides a canonicalized representation of node.
func (client *bootstrapRESTClient) String() string {
return client.endpoint.String()
}
// IsOnline - returns whether RPC client failed to connect or not.
func (client *bootstrapRESTClient) IsOnline() bool {
return atomic.LoadInt32(&client.connected) == 1
}
// Close - marks the client as closed.
func (client *bootstrapRESTClient) Close() error {
atomic.StoreInt32(&client.connected, 0)
client.restClient.Close()
return nil
}
// Verify - fetches system server config.
func (client *bootstrapRESTClient) Verify(srcCfg ServerSystemConfig) (err error) {
if newObjectLayerFn() != nil {
return nil
}
respBody, err := client.call(bootstrapRESTMethodVerify, nil, nil, -1)
if err != nil {
return
}
defer xhttp.DrainBody(respBody)
recvCfg := ServerSystemConfig{}
if err = json.NewDecoder(respBody).Decode(&recvCfg); err != nil {
return err
}
return srcCfg.Diff(recvCfg)
}
func verifyServerSystemConfig(endpointZones EndpointZones) error {
srcCfg := getServerSystemCfg()
clnts := newBootstrapRESTClients(endpointZones)
var onlineServers int
for onlineServers < len(clnts)/2 {
for _, clnt := range clnts {
if err := clnt.Verify(srcCfg); err != nil {
if isNetworkError(err) {
continue
}
return fmt.Errorf("%s as has incorrect configuration: %w", clnt.String(), err)
}
onlineServers++
}
// Sleep for a while - so that we don't go into
// 100% CPU when half the endpoints are offline.
time.Sleep(500 * time.Millisecond)
}
return nil
}
func newBootstrapRESTClients(endpointZones EndpointZones) []*bootstrapRESTClient {
seenHosts := set.NewStringSet()
var clnts []*bootstrapRESTClient
for _, ep := range endpointZones {
for _, endpoint := range ep.Endpoints {
if seenHosts.Contains(endpoint.Host) {
continue
}
seenHosts.Add(endpoint.Host)
// Only proceed for remote endpoints.
if !endpoint.IsLocal {
clnt, err := newBootstrapRESTClient(endpoint)
if err != nil {
continue
}
clnts = append(clnts, clnt)
}
}
}
return clnts
}
// Returns a new bootstrap client.
func newBootstrapRESTClient(endpoint Endpoint) (*bootstrapRESTClient, error) {
serverURL := &url.URL{
Scheme: endpoint.Scheme,
Host: endpoint.Host,
Path: bootstrapRESTPath,
}
var tlsConfig *tls.Config
if globalIsSSL {
tlsConfig = &tls.Config{
ServerName: endpoint.Hostname(),
RootCAs: globalRootCAs,
}
}
trFn := newCustomHTTPTransport(tlsConfig, rest.DefaultRESTTimeout, rest.DefaultRESTTimeout)
restClient, err := rest.NewClient(serverURL, trFn, newAuthToken)
if err != nil {
return nil, err
}
return &bootstrapRESTClient{endpoint: endpoint, restClient: restClient, connected: 1}, nil
}