mirror of
https://github.com/minio/minio.git
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231 lines
7.1 KiB
Go
231 lines
7.1 KiB
Go
/*
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* MinIO Cloud Storage, (C) 2019 MinIO, Inc.
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*
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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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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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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 cmd
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import (
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"context"
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"encoding/json"
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"fmt"
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"io"
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"net/http"
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"net/url"
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"runtime"
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"time"
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"github.com/gorilla/mux"
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"github.com/minio/minio-go/v7/pkg/set"
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xhttp "github.com/minio/minio/cmd/http"
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"github.com/minio/minio/cmd/logger"
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"github.com/minio/minio/cmd/rest"
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)
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const (
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bootstrapRESTVersion = "v1"
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bootstrapRESTVersionPrefix = SlashSeparator + bootstrapRESTVersion
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bootstrapRESTPrefix = minioReservedBucketPath + "/bootstrap"
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bootstrapRESTPath = bootstrapRESTPrefix + bootstrapRESTVersionPrefix
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)
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const (
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bootstrapRESTMethodHealth = "/health"
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bootstrapRESTMethodVerify = "/verify"
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)
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// To abstract a node over network.
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type bootstrapRESTServer struct{}
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// ServerSystemConfig - captures information about server configuration.
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type ServerSystemConfig struct {
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MinioPlatform string
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MinioRuntime string
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MinioEndpoints EndpointServerSets
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}
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// Diff - returns error on first difference found in two configs.
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func (s1 ServerSystemConfig) Diff(s2 ServerSystemConfig) error {
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if s1.MinioPlatform != s2.MinioPlatform {
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return fmt.Errorf("Expected platform '%s', found to be running '%s'",
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s1.MinioPlatform, s2.MinioPlatform)
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}
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if s1.MinioEndpoints.NEndpoints() != s2.MinioEndpoints.NEndpoints() {
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return fmt.Errorf("Expected number of endpoints %d, seen %d", s1.MinioEndpoints.NEndpoints(),
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s2.MinioEndpoints.NEndpoints())
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}
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for i, ep := range s1.MinioEndpoints {
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if ep.SetCount != s2.MinioEndpoints[i].SetCount {
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return fmt.Errorf("Expected set count %d, seen %d", ep.SetCount,
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s2.MinioEndpoints[i].SetCount)
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}
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if ep.DrivesPerSet != s2.MinioEndpoints[i].DrivesPerSet {
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return fmt.Errorf("Expected drives pet set %d, seen %d", ep.DrivesPerSet,
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s2.MinioEndpoints[i].DrivesPerSet)
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}
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for j, endpoint := range ep.Endpoints {
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if endpoint.String() != s2.MinioEndpoints[i].Endpoints[j].String() {
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return fmt.Errorf("Expected endpoint %s, seen %s", endpoint,
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s2.MinioEndpoints[i].Endpoints[j])
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}
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}
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}
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return nil
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}
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func getServerSystemCfg() ServerSystemConfig {
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return ServerSystemConfig{
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MinioPlatform: fmt.Sprintf("OS: %s | Arch: %s", runtime.GOOS, runtime.GOARCH),
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MinioEndpoints: globalEndpoints,
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}
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}
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// HealthHandler returns success if request is valid
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func (b *bootstrapRESTServer) HealthHandler(w http.ResponseWriter, r *http.Request) {}
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func (b *bootstrapRESTServer) VerifyHandler(w http.ResponseWriter, r *http.Request) {
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ctx := newContext(r, w, "VerifyHandler")
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cfg := getServerSystemCfg()
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logger.LogIf(ctx, json.NewEncoder(w).Encode(&cfg))
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w.(http.Flusher).Flush()
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}
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// registerBootstrapRESTHandlers - register bootstrap rest router.
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func registerBootstrapRESTHandlers(router *mux.Router) {
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server := &bootstrapRESTServer{}
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subrouter := router.PathPrefix(bootstrapRESTPrefix).Subrouter()
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subrouter.Methods(http.MethodPost).Path(bootstrapRESTVersionPrefix + bootstrapRESTMethodHealth).HandlerFunc(
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httpTraceHdrs(server.HealthHandler))
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subrouter.Methods(http.MethodPost).Path(bootstrapRESTVersionPrefix + bootstrapRESTMethodVerify).HandlerFunc(
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httpTraceHdrs(server.VerifyHandler))
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}
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// client to talk to bootstrap NEndpoints.
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type bootstrapRESTClient struct {
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endpoint Endpoint
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restClient *rest.Client
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}
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// Wrapper to restClient.Call to handle network errors, in case of network error the connection is marked disconnected
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// permanently. The only way to restore the connection is at the xl-sets layer by xlsets.monitorAndConnectEndpoints()
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// after verifying format.json
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func (client *bootstrapRESTClient) callWithContext(ctx context.Context, method string, values url.Values, body io.Reader, length int64) (respBody io.ReadCloser, err error) {
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if values == nil {
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values = make(url.Values)
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}
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respBody, err = client.restClient.Call(ctx, method, values, body, length)
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if err == nil {
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return respBody, nil
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}
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return nil, err
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}
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// Stringer provides a canonicalized representation of node.
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func (client *bootstrapRESTClient) String() string {
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return client.endpoint.String()
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}
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// Verify - fetches system server config.
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func (client *bootstrapRESTClient) Verify(ctx context.Context, srcCfg ServerSystemConfig) (err error) {
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if newObjectLayerFn() != nil {
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return nil
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}
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respBody, err := client.callWithContext(ctx, bootstrapRESTMethodVerify, nil, nil, -1)
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if err != nil {
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return
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}
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defer xhttp.DrainBody(respBody)
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recvCfg := ServerSystemConfig{}
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if err = json.NewDecoder(respBody).Decode(&recvCfg); err != nil {
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return err
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}
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return srcCfg.Diff(recvCfg)
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}
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func verifyServerSystemConfig(ctx context.Context, endpointServerSets EndpointServerSets) error {
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srcCfg := getServerSystemCfg()
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clnts := newBootstrapRESTClients(endpointServerSets)
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var onlineServers int
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var offlineEndpoints []string
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var retries int
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for onlineServers < len(clnts)/2 {
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for _, clnt := range clnts {
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if err := clnt.Verify(ctx, srcCfg); err != nil {
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if isNetworkError(err) {
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offlineEndpoints = append(offlineEndpoints, clnt.String())
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continue
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}
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return fmt.Errorf("%s as has incorrect configuration: %w", clnt.String(), err)
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}
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onlineServers++
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}
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select {
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case <-ctx.Done():
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return ctx.Err()
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default:
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// Sleep for a while - so that we don't go into
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// 100% CPU when half the endpoints are offline.
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time.Sleep(100 * time.Millisecond)
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retries++
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// after 5 retries start logging that servers are not reachable yet
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if retries >= 5 {
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logger.Info(fmt.Sprintf("Waiting for atleast %d remote servers to be online for bootstrap check", len(clnts)/2))
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logger.Info(fmt.Sprintf("Following servers are currently offline or unreachable %s", offlineEndpoints))
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retries = 0 // reset to log again after 5 retries.
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}
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offlineEndpoints = nil
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}
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}
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return nil
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}
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func newBootstrapRESTClients(endpointServerSets EndpointServerSets) []*bootstrapRESTClient {
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seenHosts := set.NewStringSet()
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var clnts []*bootstrapRESTClient
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for _, ep := range endpointServerSets {
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for _, endpoint := range ep.Endpoints {
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if seenHosts.Contains(endpoint.Host) {
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continue
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}
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seenHosts.Add(endpoint.Host)
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// Only proceed for remote endpoints.
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if !endpoint.IsLocal {
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clnts = append(clnts, newBootstrapRESTClient(endpoint))
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}
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}
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}
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return clnts
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}
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// Returns a new bootstrap client.
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func newBootstrapRESTClient(endpoint Endpoint) *bootstrapRESTClient {
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serverURL := &url.URL{
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Scheme: endpoint.Scheme,
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Host: endpoint.Host,
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Path: bootstrapRESTPath,
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}
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restClient := rest.NewClient(serverURL, globalInternodeTransport, newAuthToken)
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restClient.HealthCheckFn = nil
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return &bootstrapRESTClient{endpoint: endpoint, restClient: restClient}
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}
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