Mercurial > gemma
view auth/inmemory.go @ 191:01c5794608e0
Added simple makefiles to build back end and client.
author | Sascha Wilde <wilde@intevation.de> |
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date | Fri, 20 Jul 2018 17:41:44 +0200 |
parents | 3349bfc2a047 |
children |
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package auth import ( "database/sql" "log" "time" ) type InMemoryConnectionPool struct { conns map[string]*Connection cmds chan func(*InMemoryConnectionPool) } func NewInMemoryConnectionPool() *InMemoryConnectionPool { cp := &InMemoryConnectionPool{ conns: make(map[string]*Connection), cmds: make(chan func(*InMemoryConnectionPool)), } go cp.run() return cp } func (cp *InMemoryConnectionPool) run() { for { select { case cmd := <-cp.cmds: cmd(cp) case <-time.After(time.Minute): cp.cleanDB() case <-time.After(time.Minute * 5): cp.cleanToken() } } } func (cp *InMemoryConnectionPool) cleanDB() { valid := time.Now().Add(-maxDBIdle) for _, con := range cp.conns { if con.refCount <= 0 && con.last().Before(valid) { con.close() } } } func (cp *InMemoryConnectionPool) cleanToken() { now := time.Now() for token, con := range cp.conns { expires := time.Unix(con.session.ExpiresAt, 0) if expires.Before(now) { // TODO: Be more graceful here? con.close() delete(cp.conns, token) } } } func (cp *InMemoryConnectionPool) Delete(token string) bool { res := make(chan bool) cp.cmds <- func(cp *InMemoryConnectionPool) { conn, found := cp.conns[token] if !found { res <- false return } conn.close() delete(cp.conns, token) res <- true } return <-res } func (cp *InMemoryConnectionPool) Add(token string, session *Session) *Connection { res := make(chan *Connection) cp.cmds <- func(cp *InMemoryConnectionPool) { con := cp.conns[token] if con == nil { con = &Connection{} cp.conns[token] = con } con.set(session) res <- con } con := <-res return con } func (cp *InMemoryConnectionPool) Renew(token string) (string, error) { type result struct { newToken string err error } resCh := make(chan result) cp.cmds <- func(cp *InMemoryConnectionPool) { con := cp.conns[token] if con == nil { resCh <- result{err: ErrNoSuchToken} } else { delete(cp.conns, token) newToken := GenerateSessionKey() // TODO: Ensure that this is not racy! con.session.ExpiresAt = time.Now().Add(maxTokenValid).Unix() cp.conns[newToken] = con resCh <- result{newToken: newToken} } } r := <-resCh return r.newToken, r.err } func (cp *InMemoryConnectionPool) trim(conn *Connection) { conn.refCount-- for { least := time.Now() var count int var oldest *Connection for _, con := range cp.conns { if con.db != nil && con.refCount <= 0 { if last := con.last(); last.Before(least) { least = last oldest = con } count++ } } if count <= maxOpen { break } oldest.close() } } func (cp *InMemoryConnectionPool) Do(token string, fn func(*sql.DB) error) error { type result struct { con *Connection err error } res := make(chan result) cp.cmds <- func(cp *InMemoryConnectionPool) { con := cp.conns[token] if con == nil { res <- result{err: ErrNoSuchToken} return } con.touch() if con.db != nil { con.refCount++ res <- result{con: con} return } session := con.session db, err := opendb(session.User, session.Password) if err != nil { res <- result{err: err} return } con.db = db con.refCount++ res <- result{con: con} } r := <-res if r.err != nil { return r.err } defer func() { cp.cmds <- func(cp *InMemoryConnectionPool) { cp.trim(r.con) } }() return fn(r.con.db) } func (cp *InMemoryConnectionPool) Session(token string) *Session { res := make(chan *Session) cp.cmds <- func(cp *InMemoryConnectionPool) { con := cp.conns[token] if con == nil { res <- nil } else { con.touch() res <- con.session } } return <-res } func (cp *InMemoryConnectionPool) Shutdown() error { log.Println("info: shutdown in-memory connection pool.") return nil }