Created
January 28, 2021 12:21
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go-lang-conn-pool
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package main | |
import ( | |
"github.com/valyala/fasthttp" | |
"net" | |
"time" | |
"sync" | |
"fmt" | |
) | |
type clientConn struct { | |
conn net.Conn | |
} | |
type connPool struct { | |
sync.Mutex | |
size int | |
dialer net.Dialer | |
addr string | |
conns []*clientConn | |
wp waitPool | |
} | |
type wantConn struct { | |
ready chan *clientConn | |
} | |
type waitPool struct { | |
sync.Mutex | |
waiting []*wantConn | |
} | |
func (wp *waitPool) queueIdle() *wantConn { | |
wp.Lock() | |
defer wp.Unlock() | |
wc := &wantConn { | |
ready: make(chan *clientConn, 1), | |
} | |
wp.waiting = append(wp.waiting, wc) | |
return wc | |
} | |
func (wp *waitPool) TryDeliverConn(cc *clientConn) bool { | |
for wp.len() > 0 { | |
wc := wp.Shift() | |
select { | |
case wc.ready <- cc: | |
return true | |
default: | |
return false | |
} | |
} | |
return false | |
} | |
func (wp *waitPool) len() int { | |
return len(wp.waiting) | |
} | |
func (wp *waitPool) Shift() *wantConn { | |
wp.Lock() | |
defer wp.Unlock() | |
wc := wp.waiting[0] | |
wp.waiting = wp.waiting[1:] | |
return wc | |
} | |
func (cp *connPool) Prepare() { | |
cp.Lock() | |
defer cp.Unlock() | |
for i:=0; i<cp.size; i++ { | |
conn, err := cp.dialer.Dial("tcp", cp.addr) | |
if err != nil { | |
panic(err) | |
} | |
cc := clientConn { conn: conn } | |
cp.conns = append(cp.conns, &cc) | |
} | |
} | |
func (cp *connPool) Shift() *clientConn { | |
cp.Lock() | |
defer cp.Unlock() | |
conn := cp.conns[0] | |
cp.conns = cp.conns[1:] | |
return conn | |
} | |
func (cp *connPool) Push(cc *clientConn) { | |
cp.Lock() | |
defer cp.Unlock() | |
cp.conns = append(cp.conns, cc) | |
} | |
func (cp *connPool) AcquireConn() *clientConn { | |
if len(cp.conns) <= 0 { | |
fmt.Println("Queue for conn") | |
wc := cp.wp.queueIdle() | |
select { | |
case cc := <- wc.ready: | |
fmt.Println("Got connection!") | |
return cc | |
// TODO case <- timer.done: | |
} | |
} | |
clientConn := cp.Shift() | |
return clientConn | |
} | |
func (cp *connPool) ReleaseConn(cc *clientConn) { | |
if len(cp.conns) >= cp.size { | |
fmt.Println("Collection pool full closing connection") | |
cc.conn.Close() | |
} | |
delivered := false | |
if cp.wp.len() > 0 { | |
fmt.Println("Try to deliver") | |
delivered = cp.wp.TryDeliverConn(cc) | |
} | |
if !delivered { | |
fmt.Println("Not delivered") | |
cp.Push(cc) | |
} | |
} | |
func (cp *connPool) ReleaseAndRedialConn(cc *clientConn) { | |
fmt.Println("Redial") | |
} | |
func NewConnPool(size int) connPool { | |
cp := connPool { | |
size: size, | |
addr: "localhost:3000", | |
conns: []*clientConn{}, | |
dialer: net.Dialer{Timeout: 10 * time.Second}, | |
} | |
return cp | |
} | |
func DoRequest(cp *connPool, wg *sync.WaitGroup) { | |
cc := cp.AcquireConn() | |
conn := cc.conn | |
fmt.Println("Do request") | |
buff := make([]byte, 12) | |
_, write_err := conn.Write([]byte("HEAD / HTTP/1.1\r\nAccept-Encoding: gzip\r\n\r\n")) | |
if write_err != nil { | |
cp.ReleaseAndRedialConn(cc) | |
return | |
} | |
_, read_err := conn.Read(buff) | |
if read_err != nil { | |
cp.ReleaseAndRedialConn(cc) | |
return | |
} | |
wg.Done() | |
cp.ReleaseConn(cc) | |
} | |
func main() { | |
var wg sync.WaitGroup | |
cp := NewConnPool(1) | |
cp.Prepare() | |
for i:=0; i<10; i++ { | |
wg.Add(1) | |
go DoRequest(&cp, &wg) | |
} | |
wg.Wait() | |
} |
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