mirror of https://github.com/grafana/grafana
This changes forks the mysql part of the Macaron session middleware. In the forked mysql file: - takes in a config setting for SetConnMaxLifetime (this solves wait_timeout problem if it is set to a shorter interval than wait_timeout) - removes the panic when an error is returned in the Exist function. - retries the exist query once - retries the GC query oncepull/11320/head
Daniel Lee
8 years ago
parent
9cdd7cb04c
commit
3ca1e06509
@ -0,0 +1,218 @@ |
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// Copyright 2013 Beego Authors
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// Copyright 2014 The Macaron Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License"): you may
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// not use this file except in compliance with the License. You may obtain
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// 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, WITHOUT
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// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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// License for the specific language governing permissions and limitations
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// under the License.
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package session |
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import ( |
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"database/sql" |
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"fmt" |
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"log" |
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"sync" |
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"time" |
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_ "github.com/go-sql-driver/mysql" |
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"github.com/go-macaron/session" |
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) |
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// MysqlStore represents a mysql session store implementation.
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type MysqlStore struct { |
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c *sql.DB |
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sid string |
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lock sync.RWMutex |
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data map[interface{}]interface{} |
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} |
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// NewMysqlStore creates and returns a mysql session store.
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func NewMysqlStore(c *sql.DB, sid string, kv map[interface{}]interface{}) *MysqlStore { |
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return &MysqlStore{ |
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c: c, |
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sid: sid, |
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data: kv, |
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} |
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} |
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// Set sets value to given key in session.
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func (s *MysqlStore) Set(key, val interface{}) error { |
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s.lock.Lock() |
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defer s.lock.Unlock() |
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s.data[key] = val |
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return nil |
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} |
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// Get gets value by given key in session.
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func (s *MysqlStore) Get(key interface{}) interface{} { |
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s.lock.RLock() |
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defer s.lock.RUnlock() |
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return s.data[key] |
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} |
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// Delete delete a key from session.
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func (s *MysqlStore) Delete(key interface{}) error { |
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s.lock.Lock() |
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defer s.lock.Unlock() |
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delete(s.data, key) |
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return nil |
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} |
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// ID returns current session ID.
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func (s *MysqlStore) ID() string { |
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return s.sid |
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} |
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// Release releases resource and save data to provider.
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func (s *MysqlStore) Release() error { |
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data, err := session.EncodeGob(s.data) |
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if err != nil { |
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return err |
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} |
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_, err = s.c.Exec("UPDATE session SET data=?, expiry=? WHERE `key`=?", |
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data, time.Now().Unix(), s.sid) |
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return err |
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} |
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// Flush deletes all session data.
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func (s *MysqlStore) Flush() error { |
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s.lock.Lock() |
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defer s.lock.Unlock() |
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s.data = make(map[interface{}]interface{}) |
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return nil |
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} |
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// MysqlProvider represents a mysql session provider implementation.
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type MysqlProvider struct { |
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c *sql.DB |
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expire int64 |
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} |
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// Init initializes mysql session provider.
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// connStr: username:password@protocol(address)/dbname?param=value
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func (p *MysqlProvider) Init(expire int64, connStr string) (err error) { |
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p.expire = expire |
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p.c, err = sql.Open("mysql", connStr) |
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p.c.SetConnMaxLifetime(time.Second * time.Duration(sessionConnMaxLifetime)) |
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if err != nil { |
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return err |
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} |
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return p.c.Ping() |
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} |
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// Read returns raw session store by session ID.
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func (p *MysqlProvider) Read(sid string) (session.RawStore, error) { |
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var data []byte |
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err := p.c.QueryRow("SELECT data FROM session WHERE `key`=?", sid).Scan(&data) |
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if err == sql.ErrNoRows { |
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_, err = p.c.Exec("INSERT INTO session(`key`,data,expiry) VALUES(?,?,?)", |
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sid, "", time.Now().Unix()) |
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} |
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if err != nil { |
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return nil, err |
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} |
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var kv map[interface{}]interface{} |
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if len(data) == 0 { |
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kv = make(map[interface{}]interface{}) |
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} else { |
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kv, err = session.DecodeGob(data) |
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if err != nil { |
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return nil, err |
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} |
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} |
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return NewMysqlStore(p.c, sid, kv), nil |
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} |
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// Exist returns true if session with given ID exists.
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func (p *MysqlProvider) Exist(sid string) bool { |
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exists, err := p.queryExists(sid) |
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if err != nil { |
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exists, err = p.queryExists(sid) |
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} |
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if err != nil { |
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log.Printf("session/mysql: error checking if session exists: %v", err) |
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return false |
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} |
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return exists |
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} |
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func (p *MysqlProvider) queryExists(sid string) (bool, error) { |
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var data []byte |
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err := p.c.QueryRow("SELECT data FROM session WHERE `key`=?", sid).Scan(&data) |
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if err != nil && err != sql.ErrNoRows { |
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return false, err |
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} |
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return err != sql.ErrNoRows, nil |
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} |
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// Destory deletes a session by session ID.
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func (p *MysqlProvider) Destory(sid string) error { |
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_, err := p.c.Exec("DELETE FROM session WHERE `key`=?", sid) |
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return err |
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} |
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// Regenerate regenerates a session store from old session ID to new one.
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func (p *MysqlProvider) Regenerate(oldsid, sid string) (_ session.RawStore, err error) { |
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if p.Exist(sid) { |
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return nil, fmt.Errorf("new sid '%s' already exists", sid) |
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} |
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if !p.Exist(oldsid) { |
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if _, err = p.c.Exec("INSERT INTO session(`key`,data,expiry) VALUES(?,?,?)", |
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oldsid, "", time.Now().Unix()); err != nil { |
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return nil, err |
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} |
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} |
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if _, err = p.c.Exec("UPDATE session SET `key`=? WHERE `key`=?", sid, oldsid); err != nil { |
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return nil, err |
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} |
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return p.Read(sid) |
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} |
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// Count counts and returns number of sessions.
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func (p *MysqlProvider) Count() (total int) { |
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if err := p.c.QueryRow("SELECT COUNT(*) AS NUM FROM session").Scan(&total); err != nil { |
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panic("session/mysql: error counting records: " + err.Error()) |
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} |
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return total |
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} |
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// GC calls GC to clean expired sessions.
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func (p *MysqlProvider) GC() { |
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var err error |
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if _, err = p.c.Exec("DELETE FROM session WHERE expiry + ? <= UNIX_TIMESTAMP(NOW())", p.expire); err != nil { |
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_, err = p.c.Exec("DELETE FROM session WHERE expiry + ? <= UNIX_TIMESTAMP(NOW())", p.expire) |
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} |
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if err != nil { |
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log.Printf("session/mysql: error garbage collecting: %v", err) |
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} |
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} |
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func init() { |
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session.Register("mysql", &MysqlProvider{}) |
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} |
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