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pool.go
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pool.go
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package ldappool
import (
"context"
"errors"
"log"
"time"
"github.com/m-vinc/ldap/v3"
)
type Pool struct {
debug bool
// connectionTimeout time.Duration
// wakeupInterval time.Duration
addr string
bindCredentials *BindCredentials
opts []ldap.DialOpt
conns chan *ldap.Conn
}
func (p *Pool) open() (*ldap.Conn, error) {
conn, err := ldap.DialURL(p.addr, p.opts...)
if err != nil {
return nil, err
}
if p.bindCredentials != nil {
err = conn.Bind(p.bindCredentials.Username, p.bindCredentials.Password)
if err != nil {
return nil, err
}
}
return conn, nil
}
func (p *Pool) release(conn *ldap.Conn) {
p.conns <- conn
}
func (p *Pool) pull(ctx context.Context) (*ldap.Conn, error) {
ctx, cancel := context.WithTimeout(ctx, time.Second*10)
defer cancel()
select {
case <-ctx.Done():
return nil, ctx.Err()
case conn := <-p.conns:
if conn.IsClosing() {
log.Println("connection closed, trying to re-open one connection")
for {
c, err := p.open()
if err != nil {
time.Sleep(5 * time.Second)
continue
}
return c, nil
}
}
return conn, nil
}
}
func (p *Pool) Close() error {
l := len(p.conns)
for i := 0; i < l; i++ {
c := <-p.conns
if p.debug {
log.Printf("closing %v", c)
}
c.Close()
}
return nil
}
func (p *Pool) init() error {
errs := []error{}
for i := 0; i < cap(p.conns); i++ {
c, err := p.open()
if err != nil {
errs = append(errs, err)
continue
}
p.conns <- c
}
if len(errs) == cap(p.conns) {
if p.debug {
log.Printf("%+v", errs)
}
return errors.New("unable to initialize at most one connection")
}
return nil
}
type PoolOptions struct {
Debug bool
URL string
BindCredentials *BindCredentials
ConnectionsCount int
}
type BindCredentials struct {
Username string
Password string
}
func NewPool(po *PoolOptions) (*Pool, error) {
connectionsCount := 5
if po.ConnectionsCount != 0 {
connectionsCount = po.ConnectionsCount
}
pool := &Pool{
debug: po.Debug,
addr: po.URL,
conns: make(chan *ldap.Conn, 5),
bindCredentials: po.BindCredentials,
}
err := pool.init()
if err != nil {
return nil, err
}
if pool.debug {
log.Printf("LDAP pool initialized with %d connections. Wakeup interval set to %s, ConnectionTimeout set to %s.", connectionsCount)
}
return pool, nil
}