minio/cmd/browser-peer-rpc.go
Krishna Srinivas 14e6c5ec08 Simplify the steps to make changes to config.json (#5186)
This change introduces following simplified steps to follow 
during config migration.

```
 // Steps to move from version N to version N+1
 // 1. Add new struct serverConfigVN+1 in config-versions.go
 // 2. Set configCurrentVersion to "N+1"
 // 3. Set serverConfigCurrent to serverConfigVN+1
 // 4. Add new migration function (ex. func migrateVNToVN+1()) in config-migrate.go
 // 5. Call migrateVNToVN+1() from migrateConfig() in config-migrate.go
 // 6. Make changes in config-current_test.go for any test change
```
2017-11-29 13:12:47 -08:00

141 lines
3.8 KiB
Go

/*
* 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 (
"fmt"
"path"
"sync"
"time"
"github.com/minio/minio/pkg/auth"
)
// SetAuthPeerArgs - Arguments collection for SetAuth RPC call
type SetAuthPeerArgs struct {
// For Auth
AuthRPCArgs
// New credentials that receiving peer should update to.
Creds auth.Credentials
}
// SetAuthPeer - Update to new credentials sent from a peer Minio
// server. Since credentials are already validated on the sending
// peer, here we just persist to file and update in-memory config. All
// subsequently running isAuthTokenValid() calls will fail, and clients
// will be forced to re-establish connections. Connections will be
// re-established only when the sending client has also updated its
// credentials.
func (br *browserPeerAPIHandlers) SetAuthPeer(args SetAuthPeerArgs, reply *AuthRPCReply) error {
if err := args.IsAuthenticated(); err != nil {
return err
}
if !args.Creds.IsValid() {
return fmt.Errorf("Invalid credential passed")
}
// Update credentials in memory
prevCred := globalServerConfig.SetCredential(args.Creds)
// Save credentials to config file
if err := globalServerConfig.Save(); err != nil {
// Save the current creds when failed to update.
globalServerConfig.SetCredential(prevCred)
errorIf(err, "Unable to update the config with new credentials sent from browser RPC.")
return err
}
return nil
}
// Sends SetAuthPeer RPCs to all peers in the Minio cluster
func updateCredsOnPeers(creds auth.Credentials) map[string]error {
// Get list of peer addresses (from globalS3Peers)
peers := []string{}
for _, p := range globalS3Peers {
peers = append(peers, p.addr)
}
// Array of errors for each peer
errs := make([]error, len(peers))
var wg sync.WaitGroup
serverCred := globalServerConfig.GetCredential()
// Launch go routines to send request to each peer in parallel.
for ix := range peers {
wg.Add(1)
go func(ix int) {
defer wg.Done()
// Exclude self to avoid race with
// invalidating the RPC token.
if peers[ix] == globalMinioAddr {
errs[ix] = nil
return
}
// Initialize client
client := newAuthRPCClient(authConfig{
accessKey: serverCred.AccessKey,
secretKey: serverCred.SecretKey,
serverAddr: peers[ix],
secureConn: globalIsSSL,
serviceEndpoint: path.Join(minioReservedBucketPath, browserPeerPath),
serviceName: "BrowserPeer",
})
// Construct RPC call arguments.
args := SetAuthPeerArgs{Creds: creds}
// Make RPC call - we only care about error
// response and not the reply.
err := client.Call("BrowserPeer.SetAuthPeer", &args, &AuthRPCReply{})
// We try a bit hard (3 attempts with 1 second delay)
// to set creds on peers in case of failure.
if err != nil {
for i := 0; i < 2; i++ {
time.Sleep(1 * time.Second) // 1 second delay.
err = client.Call("BrowserPeer.SetAuthPeer", &args, &AuthRPCReply{})
if err == nil {
break
}
}
}
// Send result down the channel
errs[ix] = err
}(ix)
}
// Wait for requests to complete.
wg.Wait()
// Put errors into map.
errsMap := make(map[string]error)
for i, err := range errs {
if err != nil {
errsMap[peers[i]] = err
}
}
return errsMap
}