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Auto-reconnect for regular authRPC client. (#3506)
Implement a storage rpc specific rpc client, which does not reconnect unnecessarily. Instead reconnect is handled at a different layer for storage alone. Rest of the calls using AuthRPC automatically reconnect, i.e upon an error equal to `rpc.ErrShutdown` they dial again and call the requested method again.
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parent
41cf580bb1
commit
dd68cdd802
@ -17,7 +17,6 @@
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package cmd
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import (
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"net/rpc"
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"net/url"
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"path"
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"sync"
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@ -58,22 +57,14 @@ func (lc localAdminClient) Restart() error {
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func (rc remoteAdminClient) Stop() error {
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args := GenericArgs{}
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reply := GenericReply{}
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err := rc.Call("Service.Shutdown", &args, &reply)
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if err != nil && err == rpc.ErrShutdown {
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rc.Close()
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}
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return err
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return rc.Call("Service.Shutdown", &args, &reply)
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}
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// Restart - Sends restart command to remote server via RPC.
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func (rc remoteAdminClient) Restart() error {
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args := GenericArgs{}
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reply := GenericReply{}
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err := rc.Call("Service.Restart", &args, &reply)
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if err != nil && err == rpc.ErrShutdown {
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rc.Close()
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}
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return err
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return rc.Call("Service.Restart", &args, &reply)
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}
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// adminPeer - represents an entity that implements Stop and Restart methods.
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@ -76,7 +76,6 @@ type AuthRPCClient struct {
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mu sync.Mutex
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config *authConfig
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rpc *RPCClient // reconnect'able rpc client built on top of net/rpc Client
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isLoggedIn bool // Indicates if the auth client has been logged in and token is valid.
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serverToken string // Disk rpc JWT based token.
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serverVersion string // Server version exchanged by the RPC.
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}
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@ -88,8 +87,6 @@ func newAuthClient(cfg *authConfig) *AuthRPCClient {
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config: cfg,
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// Initialize a new reconnectable rpc client.
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rpc: newRPCClient(cfg.address, cfg.path, cfg.secureConn),
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// Allocated auth client not logged in yet.
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isLoggedIn: false,
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}
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}
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@ -97,7 +94,7 @@ func newAuthClient(cfg *authConfig) *AuthRPCClient {
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func (authClient *AuthRPCClient) Close() error {
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authClient.mu.Lock()
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// reset token on closing a connection
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authClient.isLoggedIn = false
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authClient.serverToken = ""
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authClient.mu.Unlock()
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return authClient.rpc.Close()
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}
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@ -109,7 +106,7 @@ func (authClient *AuthRPCClient) Login() (err error) {
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defer authClient.mu.Unlock()
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// Return if already logged in.
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if authClient.isLoggedIn {
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if authClient.serverToken != "" {
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return nil
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}
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@ -135,7 +132,6 @@ func (authClient *AuthRPCClient) Login() (err error) {
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// Set token, time stamp as received from a successful login call.
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authClient.serverToken = reply.Token
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authClient.serverVersion = reply.ServerVersion
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authClient.isLoggedIn = true
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return nil
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}
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@ -146,21 +142,34 @@ func (authClient *AuthRPCClient) Call(serviceMethod string, args interface {
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SetToken(token string)
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SetTimestamp(tstamp time.Time)
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}, reply interface{}) (err error) {
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// On successful login, attempt the call.
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loginAndCallFn := func() error {
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// On successful login, proceed to attempt the requested service method.
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if err = authClient.Login(); err == nil {
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// Set token and timestamp before the rpc call.
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args.SetToken(authClient.serverToken)
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args.SetTimestamp(time.Now().UTC())
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// Call the underlying rpc.
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// Finally make the network call using net/rpc client.
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err = authClient.rpc.Call(serviceMethod, args, reply)
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// Invalidate token, and mark it for re-login on subsequent reconnect.
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if err == rpc.ErrShutdown {
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authClient.mu.Lock()
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authClient.isLoggedIn = false
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authClient.mu.Unlock()
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}
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return err
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}
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doneCh := make(chan struct{})
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defer close(doneCh)
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for i := range newRetryTimer(time.Second, time.Second*30, MaxJitter, doneCh) {
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// Invalidate token, and mark it for re-login and
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// reconnect upon rpc shutdown.
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if err = loginAndCallFn(); err == rpc.ErrShutdown {
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// Close the underlying connection, and proceed to reconnect
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// if we haven't reached the retry threshold.
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authClient.Close()
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// No need to return error until the retry count threshold has reached.
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if i < globalMaxAuthRPCRetryThreshold {
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continue
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}
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}
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break
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}
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return err
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}
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@ -16,10 +16,7 @@
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package cmd
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import (
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"encoding/json"
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"net/rpc"
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)
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import "encoding/json"
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// BucketMetaState - Interface to update bucket metadata in-memory
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// state.
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@ -112,62 +109,26 @@ type remoteBucketMetaState struct {
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// change to remote peer via RPC call.
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func (rc *remoteBucketMetaState) UpdateBucketNotification(args *SetBucketNotificationPeerArgs) error {
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reply := GenericReply{}
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err := rc.Call("S3.SetBucketNotificationPeer", args, &reply)
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// Check for network error and retry once.
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if err != nil && err == rpc.ErrShutdown {
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// Close the underlying connection to attempt once more.
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rc.Close()
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// Attempt again and proceed.
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err = rc.Call("S3.SetBucketNotificationPeer", args, &reply)
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}
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return err
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return rc.Call("S3.SetBucketNotificationPeer", args, &reply)
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}
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// remoteBucketMetaState.UpdateBucketListener - sends bucket listener change to
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// remote peer via RPC call.
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func (rc *remoteBucketMetaState) UpdateBucketListener(args *SetBucketListenerPeerArgs) error {
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reply := GenericReply{}
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err := rc.Call("S3.SetBucketListenerPeer", args, &reply)
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// Check for network error and retry once.
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if err != nil && err == rpc.ErrShutdown {
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// Close the underlying connection to attempt once more.
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rc.Close()
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// Attempt again and proceed.
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err = rc.Call("S3.SetBucketListenerPeer", args, &reply)
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}
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return err
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return rc.Call("S3.SetBucketListenerPeer", args, &reply)
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}
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// remoteBucketMetaState.UpdateBucketPolicy - sends bucket policy change to remote
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// peer via RPC call.
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func (rc *remoteBucketMetaState) UpdateBucketPolicy(args *SetBucketPolicyPeerArgs) error {
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reply := GenericReply{}
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err := rc.Call("S3.SetBucketPolicyPeer", args, &reply)
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// Check for network error and retry once.
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if err != nil && err == rpc.ErrShutdown {
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// Close the underlying connection to attempt once more.
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rc.Close()
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// Attempt again and proceed.
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err = rc.Call("S3.SetBucketPolicyPeer", args, &reply)
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}
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return err
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return rc.Call("S3.SetBucketPolicyPeer", args, &reply)
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}
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// remoteBucketMetaState.SendEvent - sends event for bucket listener to remote
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// peer via RPC call.
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func (rc *remoteBucketMetaState) SendEvent(args *EventArgs) error {
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reply := GenericReply{}
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err := rc.Call("S3.Event", args, &reply)
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// Check for network error and retry once.
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if err != nil && err == rpc.ErrShutdown {
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// Close the underlying connection to attempt once more.
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rc.Close()
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// Attempt again and proceed.
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err = rc.Call("S3.Event", args, &reply)
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}
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return err
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return rc.Call("S3.Event", args, &reply)
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}
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@ -93,6 +93,10 @@ var (
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// giving up on the remote disk entirely.
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globalMaxStorageRetryThreshold = 3
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// Attempt to retry only this many number of times before
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// giving up on the remote RPC entirely.
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globalMaxAuthRPCRetryThreshold = 1
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// Add new variable global values here.
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)
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@ -23,7 +23,9 @@ import (
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"net/rpc"
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"net/url"
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"path"
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"sync"
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"sync/atomic"
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"time"
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"github.com/minio/minio/pkg/disk"
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)
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@ -32,7 +34,7 @@ type networkStorage struct {
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networkIOErrCount int32 // ref: https://golang.org/pkg/sync/atomic/#pkg-note-BUG
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netAddr string
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netPath string
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rpcClient *AuthRPCClient
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rpcClient *storageRPCClient
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}
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const (
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@ -97,6 +99,104 @@ func toStorageErr(err error) error {
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return err
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}
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// storageRPCClient is a wrapper type for RPCClient which provides JWT based authentication across reconnects.
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type storageRPCClient struct {
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sync.Mutex
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cfg storageConfig
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rpc *RPCClient // reconnect'able rpc client built on top of net/rpc Client
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serverToken string // Disk rpc JWT based token.
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serverVersion string // Server version exchanged by the RPC.
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}
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// Storage config represents authentication credentials and Login
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// method name to be used for fetching JWT tokens from the storage
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// server.
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type storageConfig struct {
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addr string // Network address path of storage RPC server.
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path string // Network storage path for HTTP dial.
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secureConn bool // Indicates if this storage RPC is on a secured connection.
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creds credential
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}
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// newStorageClient - returns a jwt based authenticated (go) storage rpc client.
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func newStorageClient(storageCfg storageConfig) *storageRPCClient {
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return &storageRPCClient{
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// Save the config.
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cfg: storageCfg,
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rpc: newRPCClient(storageCfg.addr, storageCfg.path, storageCfg.secureConn),
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}
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}
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// Close - closes underlying rpc connection.
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func (storageClient *storageRPCClient) Close() error {
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storageClient.Lock()
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// reset token on closing a connection
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storageClient.serverToken = ""
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storageClient.Unlock()
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return storageClient.rpc.Close()
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}
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// Login - a jwt based authentication is performed with rpc server.
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func (storageClient *storageRPCClient) Login() (err error) {
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storageClient.Lock()
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// As soon as the function returns unlock,
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defer storageClient.Unlock()
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// Return if token is already set.
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if storageClient.serverToken != "" {
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return nil
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}
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reply := RPCLoginReply{}
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if err = storageClient.rpc.Call("Storage.LoginHandler", RPCLoginArgs{
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Username: storageClient.cfg.creds.AccessKey,
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Password: storageClient.cfg.creds.SecretKey,
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}, &reply); err != nil {
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return err
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}
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// Validate if version do indeed match.
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if reply.ServerVersion != Version {
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return errServerVersionMismatch
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}
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// Validate if server timestamp is skewed.
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curTime := time.Now().UTC()
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if curTime.Sub(reply.Timestamp) > globalMaxSkewTime {
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return errServerTimeMismatch
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}
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// Set token, time stamp as received from a successful login call.
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storageClient.serverToken = reply.Token
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storageClient.serverVersion = reply.ServerVersion
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return nil
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}
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// Call - If rpc connection isn't established yet since previous disconnect,
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// connection is established, a jwt authenticated login is performed and then
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// the call is performed.
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func (storageClient *storageRPCClient) Call(serviceMethod string, args interface {
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SetToken(token string)
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SetTimestamp(tstamp time.Time)
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}, reply interface{}) (err error) {
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// On successful login, attempt the call.
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if err = storageClient.Login(); err != nil {
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return err
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}
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// Set token and timestamp before the rpc call.
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args.SetToken(storageClient.serverToken)
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args.SetTimestamp(time.Now().UTC())
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// Call the underlying rpc.
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err = storageClient.rpc.Call(serviceMethod, args, reply)
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// Invalidate token, and mark it for re-login.
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if err == rpc.ErrShutdown {
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storageClient.Close()
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}
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return err
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}
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// Initialize new storage rpc client.
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func newStorageRPC(ep *url.URL) (StorageAPI, error) {
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if ep == nil {
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@ -108,28 +208,28 @@ func newStorageRPC(ep *url.URL) (StorageAPI, error) {
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rpcAddr := ep.Host
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// Initialize rpc client with network address and rpc path.
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accessKeyID := serverConfig.GetCredential().AccessKey
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secretAccessKey := serverConfig.GetCredential().SecretKey
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accessKey := serverConfig.GetCredential().AccessKey
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secretKey := serverConfig.GetCredential().SecretKey
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if ep.User != nil {
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accessKeyID = ep.User.Username()
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accessKey = ep.User.Username()
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if key, set := ep.User.Password(); set {
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secretAccessKey = key
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secretKey = key
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}
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}
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rpcClient := newAuthClient(&authConfig{
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accessKey: accessKeyID,
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secretKey: secretAccessKey,
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secureConn: isSSL(),
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address: rpcAddr,
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path: rpcPath,
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loginMethod: "Storage.LoginHandler",
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})
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// Initialize network storage.
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ndisk := &networkStorage{
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netAddr: ep.Host,
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netPath: getPath(ep),
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rpcClient: rpcClient,
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rpcClient: newStorageClient(storageConfig{
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addr: rpcAddr,
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path: rpcPath,
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creds: credential{
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AccessKey: accessKey,
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SecretKey: secretKey,
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},
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secureConn: isSSL(),
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}),
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}
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// Returns successfully here.
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