mirror of
https://github.com/minio/minio.git
synced 2025-01-11 15:03:22 -05:00
e55926e8cf
This change initializes rpc servers associated with disks that are local. It makes object layer initialization on demand, namely on the first request to the object layer. Also adds lock RPC service vendorized minio/dsync
108 lines
2.8 KiB
Go
108 lines
2.8 KiB
Go
/*
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* Minio Cloud Storage, (C) 2016 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 main
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import (
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"fmt"
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"net/rpc"
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"path"
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"strings"
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"sync"
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router "github.com/gorilla/mux"
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)
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const lockRPCPath = "/lock"
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type lockServer struct {
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rpcPath string
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mutex sync.Mutex
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lockMap map[string]struct{}
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}
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/// Distributed lock handlers
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// LockHandler - rpc handler for lock operation.
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func (l *lockServer) LockHandler(name *string, reply *bool) error {
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l.mutex.Lock()
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defer l.mutex.Unlock()
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_, ok := l.lockMap[*name]
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if !ok {
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*reply = true
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l.lockMap[*name] = struct{}{}
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return nil
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}
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*reply = false
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return nil
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}
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// UnlockHandler - rpc handler for unlock operation.
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func (l *lockServer) UnlockHandler(name *string, reply *bool) error {
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l.mutex.Lock()
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defer l.mutex.Unlock()
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_, ok := l.lockMap[*name]
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if !ok {
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return fmt.Errorf("Unlock attempted on an un-locked entity: %s", *name)
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}
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*reply = true
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delete(l.lockMap, *name)
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return nil
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}
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// Initialize distributed lock.
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func initDistributedNSLock(mux *router.Router, serverConfig serverCmdConfig) {
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lockServers := newLockServers(serverConfig)
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registerStorageLockers(mux, lockServers)
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}
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// Create one lock server for every local storage rpc server.
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func newLockServers(serverConfig serverCmdConfig) (lockServers []*lockServer) {
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// Initialize posix storage API.
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exports := serverConfig.disks
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ignoredExports := serverConfig.ignoredDisks
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// Save ignored disks in a map
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skipDisks := make(map[string]bool)
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for _, ignoredExport := range ignoredExports {
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skipDisks[ignoredExport] = true
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}
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for _, export := range exports {
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if skipDisks[export] {
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continue
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}
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if idx := strings.LastIndex(export, ":"); idx != -1 {
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export = export[idx+1:]
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}
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lockServers = append(lockServers, &lockServer{
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rpcPath: export,
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mutex: sync.Mutex{},
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lockMap: make(map[string]struct{}),
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})
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}
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return lockServers
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}
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// registerStorageLockers - register locker rpc handlers for valyala/gorpc library clients
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func registerStorageLockers(mux *router.Router, lockServers []*lockServer) {
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lockRPCServer := rpc.NewServer()
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for _, lockServer := range lockServers {
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lockRPCServer.RegisterName("Dsync", lockServer)
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lockRouter := mux.PathPrefix(reservedBucket).Subrouter()
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lockRouter.Path(path.Join("/lock", lockServer.rpcPath)).Handler(lockRPCServer)
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}
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}
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