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/*
* Minio Cloud Storage, (C) 2016, 2017 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 (
"bytes"
"encoding/json"
"fmt"
"io"
"net/http"
"net/url"
"sync"
"time"
"github.com/gorilla/mux"
"github.com/minio/minio/pkg/auth"
"github.com/minio/minio/pkg/handlers"
"github.com/minio/minio/pkg/madmin"
)
const (
minioConfigTmpFormat = "config-%s.json"
maxConfigJSONSize = 256 * 1024 // 256KiB
)
// Type-safe query params.
type mgmtQueryKey string
// Only valid query params for mgmt admin APIs.
const (
mgmtBucket mgmtQueryKey = "bucket"
mgmtPrefix mgmtQueryKey = "prefix"
mgmtLockOlderThan mgmtQueryKey = "older-than"
mgmtClientToken mgmtQueryKey = "clientToken"
mgmtForceStart mgmtQueryKey = "forceStart"
)
var (
// This struct literal represents the Admin API version that
// the server uses.
adminAPIVersionInfo = madmin.AdminAPIVersionInfo{
Version: "1",
}
)
// VersionHandler - GET /minio/admin/version
// -----------
// Returns Administration API version
func (a adminAPIHandlers) VersionHandler(w http.ResponseWriter, r *http.Request) {
adminAPIErr := checkAdminRequestAuthType(r, globalServerConfig.GetRegion())
if adminAPIErr != ErrNone {
writeErrorResponse(w, adminAPIErr, r.URL)
return
}
jsonBytes, err := json.Marshal(adminAPIVersionInfo)
if err != nil {
writeErrorResponseJSON(w, ErrInternalError, r.URL)
errorIf(err, "Failed to marshal Admin API Version to JSON.")
return
}
writeSuccessResponseJSON(w, jsonBytes)
}
// ServiceStatusHandler - GET /minio/admin/v1/service
// ----------
// Returns server version and uptime.
func (a adminAPIHandlers) ServiceStatusHandler(w http.ResponseWriter, r *http.Request) {
adminAPIErr := checkAdminRequestAuthType(r, globalServerConfig.GetRegion())
if adminAPIErr != ErrNone {
writeErrorResponseJSON(w, adminAPIErr, r.URL)
return
}
// Fetch server version
serverVersion := madmin.ServerVersion{
Version: Version,
CommitID: CommitID,
}
// Fetch uptimes from all peers. This may fail to due to lack
// of read-quorum availability.
uptime, err := getPeerUptimes(globalAdminPeers)
if err != nil {
writeErrorResponseJSON(w, toAPIErrorCode(err), r.URL)
errorIf(err, "Possibly failed to get uptime from majority of servers.")
return
}
// Create API response
serverStatus := madmin.ServiceStatus{
ServerVersion: serverVersion,
Uptime: uptime,
}
// Marshal API response
jsonBytes, err := json.Marshal(serverStatus)
if err != nil {
writeErrorResponseJSON(w, ErrInternalError, r.URL)
errorIf(err, "Failed to marshal storage info into json.")
return
}
// Reply with storage information (across nodes in a
// distributed setup) as json.
writeSuccessResponseJSON(w, jsonBytes)
}
// ServiceStopNRestartHandler - POST /minio/admin/v1/service
// Body: {"action": <restart-action>}
// ----------
// Restarts/Stops minio server gracefully. In a distributed setup,
// restarts all the servers in the cluster.
func (a adminAPIHandlers) ServiceStopNRestartHandler(w http.ResponseWriter, r *http.Request) {
adminAPIErr := checkAdminRequestAuthType(r, globalServerConfig.GetRegion())
if adminAPIErr != ErrNone {
writeErrorResponseJSON(w, adminAPIErr, r.URL)
return
}
var sa madmin.ServiceAction
err := json.NewDecoder(r.Body).Decode(&sa)
if err != nil {
errorIf(err, "Error parsing body JSON")
writeErrorResponseJSON(w, ErrRequestBodyParse, r.URL)
return
}
var serviceSig serviceSignal
switch sa.Action {
case madmin.ServiceActionValueRestart:
serviceSig = serviceRestart
case madmin.ServiceActionValueStop:
serviceSig = serviceStop
default:
writeErrorResponseJSON(w, ErrMalformedPOSTRequest, r.URL)
errorIf(err, "Invalid service action received")
return
}
// Reply to the client before restarting minio server.
writeSuccessResponseHeadersOnly(w)
sendServiceCmd(globalAdminPeers, serviceSig)
}
// ServerProperties holds some server information such as, version, region
// uptime, etc..
type ServerProperties struct {
Uptime time.Duration `json:"uptime"`
Version string `json:"version"`
CommitID string `json:"commitID"`
Region string `json:"region"`
SQSARN []string `json:"sqsARN"`
}
// ServerConnStats holds transferred bytes from/to the server
type ServerConnStats struct {
TotalInputBytes uint64 `json:"transferred"`
TotalOutputBytes uint64 `json:"received"`
Throughput uint64 `json:"throughput,omitempty"`
}
// ServerHTTPMethodStats holds total number of HTTP operations from/to the server,
// including the average duration the call was spent.
type ServerHTTPMethodStats struct {
Count uint64 `json:"count"`
AvgDuration string `json:"avgDuration"`
}
// ServerHTTPStats holds all type of http operations performed to/from the server
// including their average execution time.
type ServerHTTPStats struct {
TotalHEADStats ServerHTTPMethodStats `json:"totalHEADs"`
SuccessHEADStats ServerHTTPMethodStats `json:"successHEADs"`
TotalGETStats ServerHTTPMethodStats `json:"totalGETs"`
SuccessGETStats ServerHTTPMethodStats `json:"successGETs"`
TotalPUTStats ServerHTTPMethodStats `json:"totalPUTs"`
SuccessPUTStats ServerHTTPMethodStats `json:"successPUTs"`
TotalPOSTStats ServerHTTPMethodStats `json:"totalPOSTs"`
SuccessPOSTStats ServerHTTPMethodStats `json:"successPOSTs"`
TotalDELETEStats ServerHTTPMethodStats `json:"totalDELETEs"`
SuccessDELETEStats ServerHTTPMethodStats `json:"successDELETEs"`
}
// ServerInfoData holds storage, connections and other
// information of a given server.
type ServerInfoData struct {
StorageInfo StorageInfo `json:"storage"`
ConnStats ServerConnStats `json:"network"`
HTTPStats ServerHTTPStats `json:"http"`
Properties ServerProperties `json:"server"`
}
// ServerInfo holds server information result of one node
type ServerInfo struct {
Error string `json:"error"`
Addr string `json:"addr"`
Data *ServerInfoData `json:"data"`
}
// ServerInfoHandler - GET /minio/admin/v1/info
// ----------
// Get server information
func (a adminAPIHandlers) ServerInfoHandler(w http.ResponseWriter, r *http.Request) {
// Authenticate request
adminAPIErr := checkAdminRequestAuthType(r, globalServerConfig.GetRegion())
if adminAPIErr != ErrNone {
writeErrorResponseJSON(w, adminAPIErr, r.URL)
return
}
// Web service response
reply := make([]ServerInfo, len(globalAdminPeers))
var wg sync.WaitGroup
// Gather server information for all nodes
for i, p := range globalAdminPeers {
wg.Add(1)
// Gather information from a peer in a goroutine
go func(idx int, peer adminPeer) {
defer wg.Done()
// Initialize server info at index
reply[idx] = ServerInfo{Addr: peer.addr}
serverInfoData, err := peer.cmdRunner.ServerInfoData()
if err != nil {
errorIf(err, "Unable to get server info from %s.", peer.addr)
reply[idx].Error = err.Error()
return
}
reply[idx].Data = &serverInfoData
}(i, p)
}
wg.Wait()
// Marshal API response
jsonBytes, err := json.Marshal(reply)
if err != nil {
writeErrorResponseJSON(w, ErrInternalError, r.URL)
errorIf(err, "Failed to marshal storage info into json.")
return
}
// Reply with storage information (across nodes in a
// distributed setup) as json.
writeSuccessResponseJSON(w, jsonBytes)
}
// validateLockQueryParams - Validates query params for list/clear
// locks management APIs.
func validateLockQueryParams(vars url.Values) (string, string, time.Duration,
APIErrorCode) {
bucket := vars.Get(string(mgmtBucket))
prefix := vars.Get(string(mgmtPrefix))
olderThanStr := vars.Get(string(mgmtLockOlderThan))
// N B empty bucket name is invalid
if !IsValidBucketName(bucket) {
return "", "", time.Duration(0), ErrInvalidBucketName
}
// empty prefix is valid.
if !IsValidObjectPrefix(prefix) {
return "", "", time.Duration(0), ErrInvalidObjectName
}
// If older-than parameter was empty then set it to 0s to list
// all locks older than now.
if olderThanStr == "" {
olderThanStr = "0s"
}
duration, err := time.ParseDuration(olderThanStr)
if err != nil {
errorIf(err, "Failed to parse duration passed as query value.")
return "", "", time.Duration(0), ErrInvalidDuration
}
return bucket, prefix, duration, ErrNone
}
// ListLocksHandler - GET /minio/admin/v1/locks?bucket=mybucket&prefix=myprefix&older-than=10s
// - bucket is a mandatory query parameter
// - prefix and older-than are optional query parameters
// ---------
// Lists locks held on a given bucket, prefix and duration it was held for.
func (a adminAPIHandlers) ListLocksHandler(w http.ResponseWriter, r *http.Request) {
adminAPIErr := checkAdminRequestAuthType(r, globalServerConfig.GetRegion())
if adminAPIErr != ErrNone {
writeErrorResponseJSON(w, adminAPIErr, r.URL)
return
}
vars := r.URL.Query()
bucket, prefix, duration, adminAPIErr := validateLockQueryParams(vars)
if adminAPIErr != ErrNone {
writeErrorResponseJSON(w, adminAPIErr, r.URL)
return
}
// Fetch lock information of locks matching bucket/prefix that
// are available for longer than duration.
volLocks, err := listPeerLocksInfo(globalAdminPeers, bucket, prefix,
duration)
if err != nil {
writeErrorResponseJSON(w, ErrInternalError, r.URL)
errorIf(err, "Failed to fetch lock information from remote nodes.")
return
}
// Marshal list of locks as json.
jsonBytes, err := json.Marshal(volLocks)
if err != nil {
writeErrorResponseJSON(w, ErrInternalError, r.URL)
errorIf(err, "Failed to marshal lock information into json.")
return
}
// Reply with list of locks held on bucket, matching prefix
// held longer than duration supplied, as json.
writeSuccessResponseJSON(w, jsonBytes)
}
// ClearLocksHandler - DELETE /minio/admin/v1/locks?bucket=mybucket&prefix=myprefix&duration=duration
// - bucket is a mandatory query parameter
// - prefix and older-than are optional query parameters
// ---------
// Clear locks held on a given bucket, prefix and duration it was held for.
func (a adminAPIHandlers) ClearLocksHandler(w http.ResponseWriter, r *http.Request) {
ctx := newContext(r, "ClearLocks")
adminAPIErr := checkAdminRequestAuthType(r, globalServerConfig.GetRegion())
if adminAPIErr != ErrNone {
writeErrorResponseJSON(w, adminAPIErr, r.URL)
return
}
vars := r.URL.Query()
bucket, prefix, duration, adminAPIErr := validateLockQueryParams(vars)
if adminAPIErr != ErrNone {
writeErrorResponseJSON(w, adminAPIErr, r.URL)
return
}
// Fetch lock information of locks matching bucket/prefix that
// are held for longer than duration.
volLocks, err := listPeerLocksInfo(globalAdminPeers, bucket, prefix,
duration)
if err != nil {
writeErrorResponseJSON(w, ErrInternalError, r.URL)
errorIf(err, "Failed to fetch lock information from remote nodes.")
return
}
// Marshal list of locks as json.
jsonBytes, err := json.Marshal(volLocks)
if err != nil {
writeErrorResponseJSON(w, ErrInternalError, r.URL)
errorIf(err, "Failed to marshal lock information into json.")
return
}
newObjectLayerFn().ClearLocks(ctx, volLocks)
// Reply with list of locks cleared, as json.
writeSuccessResponseJSON(w, jsonBytes)
}
// extractHealInitParams - Validates params for heal init API.
func extractHealInitParams(r *http.Request) (bucket, objPrefix string,
hs madmin.HealOpts, clientToken string, forceStart bool,
err APIErrorCode) {
vars := mux.Vars(r)
bucket = vars[string(mgmtBucket)]
objPrefix = vars[string(mgmtPrefix)]
if bucket == "" {
if objPrefix != "" {
// Bucket is required if object-prefix is given
err = ErrHealMissingBucket
return
}
} else if !IsValidBucketName(bucket) {
err = ErrInvalidBucketName
return
}
// empty prefix is valid.
if !IsValidObjectPrefix(objPrefix) {
err = ErrInvalidObjectName
return
}
qParms := r.URL.Query()
if len(qParms[string(mgmtClientToken)]) > 0 {
clientToken = qParms[string(mgmtClientToken)][0]
}
if _, ok := qParms[string(mgmtForceStart)]; ok {
forceStart = true
}
// ignore body if clientToken is provided
if clientToken == "" {
jerr := json.NewDecoder(r.Body).Decode(&hs)
if jerr != nil {
errorIf(jerr, "Error parsing body JSON")
err = ErrRequestBodyParse
return
}
}
err = ErrNone
return
}
// HealHandler - POST /minio/admin/v1/heal/
// -----------
// Start heal processing and return heal status items.
//
// On a successful heal sequence start, a unique client token is
// returned. Subsequent requests to this endpoint providing the client
// token will receive heal status records from the running heal
// sequence.
//
// If no client token is provided, and a heal sequence is in progress
// an error is returned with information about the running heal
// sequence. However, if the force-start flag is provided, the server
// aborts the running heal sequence and starts a new one.
func (a adminAPIHandlers) HealHandler(w http.ResponseWriter, r *http.Request) {
ctx := newContext(r, "Heal")
// Get object layer instance.
objLayer := newObjectLayerFn()
if objLayer == nil {
writeErrorResponseJSON(w, ErrServerNotInitialized, r.URL)
return
}
// Validate request signature.
adminAPIErr := checkAdminRequestAuthType(r, globalServerConfig.GetRegion())
if adminAPIErr != ErrNone {
writeErrorResponseJSON(w, adminAPIErr, r.URL)
return
}
// Check if this setup has an erasure coded backend.
if !globalIsXL {
writeErrorResponseJSON(w, ErrHealNotImplemented, r.URL)
return
}
bucket, objPrefix, hs, clientToken, forceStart, apiErr := extractHealInitParams(r)
if apiErr != ErrNone {
writeErrorResponseJSON(w, apiErr, r.URL)
return
}
type healResp struct {
respBytes []byte
errCode APIErrorCode
errBody string
}
// Define a closure to start sending whitespace to client
// after 10s unless a response item comes in
keepConnLive := func(w http.ResponseWriter, respCh chan healResp) {
ticker := time.NewTicker(time.Second * 10)
started := false
forLoop:
for {
select {
case <-ticker.C:
if !started {
// Start writing response to client
started = true
setCommonHeaders(w)
w.Header().Set("Content-Type", string(mimeJSON))
// Set 200 OK status
w.WriteHeader(200)
}
// Send whitespace and keep connection open
w.Write([]byte("\n\r"))
w.(http.Flusher).Flush()
case hr := <-respCh:
switch {
case hr.errCode == ErrNone:
writeSuccessResponseJSON(w, hr.respBytes)
case hr.errBody == "":
writeErrorResponseJSON(w, hr.errCode, r.URL)
default:
writeCustomErrorResponseJSON(w, hr.errCode, hr.errBody, r.URL)
}
break forLoop
}
}
ticker.Stop()
}
// find number of disks in the setup
info := objLayer.StorageInfo(ctx)
numDisks := info.Backend.OfflineDisks + info.Backend.OnlineDisks
if clientToken == "" {
// Not a status request
nh := newHealSequence(bucket, objPrefix, handlers.GetSourceIP(r),
numDisks, hs, forceStart)
respCh := make(chan healResp)
go func() {
respBytes, errCode, errMsg := globalAllHealState.LaunchNewHealSequence(nh)
hr := healResp{respBytes, errCode, errMsg}
respCh <- hr
}()
// Due to the force-starting functionality, the Launch
// call above can take a long time - to keep the
// connection alive, we start sending whitespace
keepConnLive(w, respCh)
} else {
// Since clientToken is given, fetch heal status from running
// heal sequence.
path := bucket + "/" + objPrefix
respBytes, errCode := globalAllHealState.PopHealStatusJSON(
path, clientToken)
if errCode != ErrNone {
writeErrorResponseJSON(w, errCode, r.URL)
} else {
writeSuccessResponseJSON(w, respBytes)
}
}
}
// GetConfigHandler - GET /minio/admin/v1/config
// Get config.json of this minio setup.
func (a adminAPIHandlers) GetConfigHandler(w http.ResponseWriter, r *http.Request) {
// Validate request si
F438
gnature.
adminAPIErr := checkAdminRequestAuthType(r, globalServerConfig.GetRegion())
if adminAPIErr != ErrNone {
writeErrorResponseJSON(w, adminAPIErr, r.URL)
return
}
// check if objectLayer is initialized, if not return.
if newObjectLayerFn() == nil {
writeErrorResponseJSON(w, ErrServerNotInitialized, r.URL)
return
}
// Take a read lock on minio/config.json. NB minio is a
// reserved bucket name and wouldn't conflict with normal
// object operations.
configLock := globalNSMutex.NewNSLock(minioReservedBucket, minioConfigFile)
if configLock.GetRLock(globalObjectTimeout) != nil {
writeErrorResponseJSON(w, ErrOperationTimedOut, r.URL)
return
}
defer configLock.RUnlock()
// Get config.json - in distributed mode, the configuration
// occurring on a quorum of the servers is returned.
configBytes, err := getPeerConfig(globalAdminPeers)
if err != nil {
errorIf(err, "Failed to get config from peers")
writeErrorResponseJSON(w, toAdminAPIErrCode(err), r.URL)
return
}
writeSuccessResponseJSON(w, configBytes)
}
// toAdminAPIErrCode - converts errXLWriteQuorum error to admin API
// specific error.
func toAdminAPIErrCode(err error) APIErrorCode {
switch err {
case errXLWriteQuorum:
return ErrAdminConfigNoQuorum
}
return toAPIErrorCode(err)
}
// SetConfigResult - represents detailed results of a set-config
// operation.
type nodeSummary struct {
Name string `json:"name"`
ErrSet bool `json:"errSet"`
ErrMsg string `json:"errMsg"`
}
type setConfigResult struct {
NodeResults []nodeSummary `json:"nodeResults"`
Status bool `json:"status"`
}
// writeSetConfigResponse - writes setConfigResult value as json
// depending on the status.
func writeSetConfigResponse(w http.ResponseWriter, peers adminPeers,
errs []error, status bool, reqURL *url.URL) {
var nodeResults []nodeSummary
// Build nodeResults based on error values received during
// set-config operation.
for i := range errs {
nodeResults = append(nodeResults, nodeSummary{
Name: peers[i].addr,
ErrSet: errs[i] != nil,
ErrMsg: fmt.Sprintf("%v", errs[i]),
})
}
result := setConfigResult{
Status: status,
NodeResults: nodeResults,
}
// The following elaborate json encoding is to avoid escaping
// '<', '>' in <nil>. Note: json.Encoder.Encode() adds a
// gratuitous "\n".
var resultBuf bytes.Buffer
enc := json.NewEncoder(&resultBuf)
enc.SetEscapeHTML(false)
jsonErr := enc.Encode(result)
if jsonErr != nil {
writeErrorResponseJSON(w, toAPIErrorCode(jsonErr), reqURL)
return
}
writeSuccessResponseJSON(w, resultBuf.Bytes())
return
}
// SetConfigHandler - PUT /minio/admin/v1/config
func (a adminAPIHandlers) SetConfigHandler(w http.ResponseWriter, r *http.Request) {
// Get current object layer instance.
objectAPI := newObjectLayerFn()
if objectAPI == nil {
writeErrorResponseJSON(w, ErrServerNotInitialized, r.URL)
return
}
// Validate request signature.
adminAPIErr := checkAdminRequestAuthType(r, globalServerConfig.GetRegion())
if adminAPIErr != ErrNone {
writeErrorResponseJSON(w, adminAPIErr, r.URL)
return
}
// Read configuration bytes from request body.
configBuf := make([]byte, maxConfigJSONSize+1)
n, err := io.ReadFull(r.Body, configBuf)
if err == nil {
// More than maxConfigSize bytes were available
writeErrorResponse(w, ErrAdminConfigTooLarge, r.URL)
return
}
if err != io.ErrUnexpectedEOF {
errorIf(err, "Failed to read config from request body.")
writeErrorResponse(w, toAPIErrorCode(err), r.URL)
return
}
configBytes := configBuf[:n]
// Validate JSON provided in the request body: check the
// client has not sent JSON objects with duplicate keys.
if err = checkDupJSONKeys(string(configBytes)); err != nil {
errorIf(err, "config contains duplicate JSON entries.")
writeErrorResponse(w, ErrAdminConfigBadJSON, r.URL)
return
}
var config serverConfig
err = json.Unmarshal(configBytes, &config)
if err != nil {
errorIf(err, "Failed to unmarshal JSON configuration", err)
writeErrorResponse(w, toAPIErrorCode(err), r.URL)
return
}
// If credentials for the server are provided via environment,
// then credentials in the provided configuration must match.
if globalIsEnvCreds {
creds := globalServerConfig.GetCredential()
if config.Credential.AccessKey != creds.AccessKey ||
config.Credential.SecretKey != creds.SecretKey {
writeErrorResponseJSON(w, ErrAdminCredentialsMismatch, r.URL)
return
}
}
// Write config received from request onto a temporary file on
// all nodes.
tmpFileName := fmt.Sprintf(minioConfigTmpFormat, mustGetUUID())
errs := writeTmpConfigPeers(globalAdminPeers, tmpFileName, configBytes)
// Check if the operation succeeded in quorum or more nodes.
rErr := reduceWriteQuorumErrs(errs, nil, len(globalAdminPeers)/2+1)
if rErr != nil {
writeSetConfigResponse(w, globalAdminPeers, errs, false, r.URL)
return
}
// Take a lock on minio/config.json. NB minio is a reserved
// bucket name and wouldn't conflict with normal object
// operations.
configLock := globalNSMutex.NewNSLock(minioReservedBucket, minioConfigFile)
if configLock.GetLock(globalObjectTimeout) != nil {
writeErrorResponseJSON(w, ErrOperationTimedOut, r.URL)
return
}
defer configLock.Unlock()
// Rename the temporary config file to config.json
errs = commitConfigPeers(globalAdminPeers, tmpFileName)
rErr = reduceWriteQuorumErrs(errs, nil, len(globalAdminPeers)/2+1)
if rErr != nil {
writeSetConfigResponse(w, globalAdminPeers, errs, false, r.URL)
return
}
// serverMux (cmd/server-mux.go) implements graceful shutdown,
// where all listeners are closed and process restart/shutdown
// happens after 5s or completion of all ongoing http
// requests, whichever is earlier.
writeSetConfigResponse(w, globalAdminPeers, errs, true, r.URL)
// Restart all node for the modified config to take effect.
sendServiceCmd(globalAdminPeers, serviceRestart)
}
// ConfigCredsHandler - POST /minio/admin/v1/config/credential
// ----------
// Update credentials in a minio server. In a distributed setup,
// update all the servers in the cluster.
func (a adminAPIHandlers) UpdateCredentialsHandler(w http.ResponseWriter,
r *http.Request) {
// Authenticate request
adminAPIErr := checkAdminRequestAuthType(r, globalServerConfig.GetRegion())
if adminAPIErr != ErrNone {
writeErrorResponse(w, adminAPIErr, r.URL)
return
}
// Avoid setting new credentials when they are already passed
// by the environment.
if globalIsEnvCreds {
writeErrorResponse(w, ErrMethodNotAllowed, r.URL)
return
}
// Decode request body
var req madmin.SetCredsReq
err := json.NewDecoder(r.Body).Decode(&req)
if err != nil {
errorIf(err, "Error parsing body JSON")
writeErrorResponseJSON(w, ErrRequestBodyParse, r.URL)
return
}
creds, err := auth.CreateCredentials(req.AccessKey, req.SecretKey)
if err != nil {
writeErrorResponse(w, toAPIErrorCode(err), r.URL)
return
}
// Take a lock on minio/config.json. Prevents concurrent
// config file updates.
configLock := globalNSMutex.NewNSLock(minioReservedBucket, minioConfigFile)
if configLock.GetLock(globalObjectTimeout) != nil {
writeErrorResponseJSON(w, ErrOperationTimedOut, r.URL)
return
}
defer configLock.Unlock()
// Acquire lock before updating global configuration.
globalServerConfigMu.Lock()
defer globalServerConfigMu.Unlock()
// Notify all other Minio peers to update credentials
updateErrs := updateCredsOnPeers(creds)
for peer, err := range updateErrs {
errorIf(err, "Unable to update credentials on peer %s.", peer)
}
// Update local credentials in memory.
globalServerConfig.SetCredential(creds)
if err = globalServerConfig.Save(); err != nil {
writeErrorResponse(w, ErrInternalError, r.URL)
return
}
// At this stage, the operation is successful, return 200 OK
w.WriteHeader(http.StatusOK)
}