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// Copyright 2020 PingCAP, 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,
// See the License for the specific language governing permissions and
// limitations under the License.
package session
import (
"io"
"os"
"path"
"sync"
"time"
"github.com/pingcap/errors"
"github.com/pingcap/tiup/pkg/localdata"
logprinter "github.com/pingcap/tiup/pkg/logger/printer"
"github.com/pingcap/tiup/pkg/utils"
)
// Max alive time of a session
const maxAliveTime = 600 * time.Second
var (
// ErrorSessionConflict indicates that a same session existed
ErrorSessionConflict = errors.New("a session with same identity has been existed")
)
// Manager provide methods to operates on upload sessions
type Manager interface {
Write(id string, name string, reader io.Reader) error
Read(id string) (string, io.ReadCloser, error)
Delete(id string)
}
type sessionManager struct {
m *sync.Map
}
// New returns a session manager
func New() Manager {
return &sessionManager{
m: &sync.Map{},
}
}
// Write start a new session
func (s *sessionManager) Write(id, name string, reader io.Reader) error {
if _, ok := s.m.Load(id); ok {
return ErrorSessionConflict
}
logprinter.Debugf("Begin new session: %s", id)
s.m.Store(id, name)
go s.gc(id)
dataDir := os.Getenv(localdata.EnvNameComponentDataDir)
if dataDir == "" {
return errors.Errorf("cannot read environment variable %s", localdata.EnvNameComponentDataDir)
}
pkgDir := path.Join(dataDir, "packages")
if err := utils.MkdirAll(pkgDir, 0755); err != nil {
return errors.Annotate(err, "create package dir")
}
filePath := path.Join(pkgDir, id+"_"+name)
file, err := os.Create(filePath)
if err != nil {
return errors.Annotate(err, "create tar file")
}
defer file.Close()
if _, err := io.Copy(file, reader); err != nil {
return errors.Annotate(err, "write tar file")
}
return nil
}
// Read returns the tar file of given session
func (s *sessionManager) Read(id string) (string, io.ReadCloser, error) {
n, ok := s.m.Load(id)
if !ok {
return "", nil, nil
}
name := n.(string)
dataDir := os.Getenv(localdata.EnvNameComponentDataDir)
if dataDir == "" {
return "", nil, errors.Errorf("cannot read environment variable %s", localdata.EnvNameComponentDataDir)
}
pkgDir := path.Join(dataDir, "packages")
if err := utils.MkdirAll(pkgDir, 0755); err != nil {
return "", nil, errors.Annotate(err, "create package dir")
}
filePath := path.Join(pkgDir, id+"_"+name)
file, err := os.Open(filePath)
if err != nil {
return "", nil, errors.Annotate(err, "open tar file")
}
return name, file, nil
}
// Delete a session
func (s *sessionManager) Delete(id string) {
logprinter.Debugf("Delete session: %s", id)
n, ok := s.m.Load(id)
if !ok {
return
}
name := n.(string)
os.Remove(path.Join(os.Getenv(localdata.EnvNameComponentDataDir), "packages", id+"_"+name))
s.m.Delete(id)
}
func (s *sessionManager) gc(id string) {
time.Sleep(maxAliveTime)
if _, ok := s.m.Load(id); !ok {
return
}
s.Delete(id)
}
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