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net.go
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166 lines (141 loc) · 3.51 KB
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/*
* Copyright 2018 The CovenantSQL Authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package utils
import (
"context"
"errors"
"fmt"
"math/rand"
"net"
"sync"
"time"
"github.com/CovenantSQL/CovenantSQL/utils/log"
)
var (
// ErrNotEnoughPorts defines error indicating random port allocation failure.
ErrNotEnoughPorts = errors.New("not enough ports in port range")
allocatedPorts sync.Map
allocateLock sync.Mutex
)
func testPortConnectable(addr string, timeout time.Duration) bool {
conn, err := net.DialTimeout("tcp", addr, timeout)
if err != nil {
log.Infof("test dial to %s failed", addr)
return false
}
conn.Close()
return true
}
func testPort(bindAddr string, port int, excludeAllocated bool) bool {
addr := net.JoinHostPort(bindAddr, fmt.Sprint(port))
if excludeAllocated {
if _, ok := allocatedPorts.Load(addr); ok {
return false
}
}
ln, err := net.Listen("tcp", addr)
if err != nil {
return false
}
ln.Close()
return true
}
// WaitToConnect returns only when port is ready to connect or canceled by context.
func WaitToConnect(ctx context.Context, bindAddr string, ports []int, interval time.Duration) (err error) {
for {
continueCheckC:
select {
case <-ctx.Done():
err = ctx.Err()
return
case <-time.After(interval):
for _, port := range ports {
addr := net.JoinHostPort(bindAddr, fmt.Sprint(port))
if !testPortConnectable(addr, 100*time.Millisecond) {
goto continueCheckC
}
}
return
}
}
}
// WaitForPorts returns only when port is ready to listen or canceled by context.
func WaitForPorts(ctx context.Context, bindAddr string, ports []int, interval time.Duration) (err error) {
for {
continueCheck:
select {
case <-ctx.Done():
err = ctx.Err()
return
case <-time.After(interval):
for _, port := range ports {
if !testPort(bindAddr, port, false) {
goto continueCheck
}
}
return
}
}
}
// GetRandomPorts returns available random ports, previously allocated ports will be ignored.
func GetRandomPorts(bindAddr string, minPort, maxPort, count int) (ports []int, err error) {
allocateLock.Lock()
defer allocateLock.Unlock()
ports = make([]int, 0, count)
defer func() {
// save the allocated ports
if err == nil {
for _, port := range ports {
addr := net.JoinHostPort(bindAddr, fmt.Sprint(port))
allocatedPorts.Store(addr, true)
addr = net.JoinHostPort("0.0.0.0", fmt.Sprint(port))
allocatedPorts.Store(addr, true)
}
}
}()
if count == 0 {
return
}
if minPort == 0 {
minPort = 1
}
if minPort > maxPort {
err = ErrNotEnoughPorts
return
}
pivotPort := minPort
if maxPort != minPort {
pivotPort = rand.Intn(maxPort-minPort) + minPort
}
for i := pivotPort; i <= maxPort; i++ {
if testPort(bindAddr, i, true) {
ports = append(ports, i)
}
if len(ports) == count {
return
}
}
for i := minPort; i < pivotPort; i++ {
if testPort(bindAddr, i, true) {
ports = append(ports, i)
}
if len(ports) == count {
return
}
}
err = ErrNotEnoughPorts
return
}