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dialer.go
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dialer.go
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package fastcgi
import "sync"
type dialer interface {
Dial() (*FCGIClient, error)
Close(*FCGIClient) error
}
// basicDialer is a basic dialer that wraps default fcgi functions.
type basicDialer struct {
network, address string
}
func (b basicDialer) Dial() (*FCGIClient, error) { return Dial(b.network, b.address) }
func (b basicDialer) Close(c *FCGIClient) error { return c.Close() }
// persistentDialer keeps a pool of fcgi connections.
// connections are not closed after use, rather added back to the pool for reuse.
type persistentDialer struct {
size int
network string
address string
pool []*FCGIClient
sync.Mutex
}
func (p *persistentDialer) Dial() (*FCGIClient, error) {
p.Lock()
// connection is available, return first one.
if len(p.pool) > 0 {
client := p.pool[0]
p.pool = p.pool[1:]
p.Unlock()
return client, nil
}
p.Unlock()
// no connection available, create new one
return Dial(p.network, p.address)
}
func (p *persistentDialer) Close(client *FCGIClient) error {
p.Lock()
if len(p.pool) < p.size {
// pool is not full yet, add connection for reuse
p.pool = append(p.pool, client)
p.Unlock()
return nil
}
p.Unlock()
// otherwise, close the connection.
return client.Close()
}