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Test if port available before using it for testing. #166

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Test if port available before using it for testing. #166

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30 changes: 24 additions & 6 deletions internal/test/ports.go
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Original file line number Diff line number Diff line change
Expand Up @@ -3,20 +3,38 @@

package test

import "sync"
import (
"fmt"
"net"
"sync"
)

var portMutex sync.Mutex
var nodePortBase uint32 = 32000
var peerPortBase uint32 = 33000

const PortLimit = 1 << 16

func testPort(port uint32) bool {
l, err := net.Listen("tcp", fmt.Sprintf(":%d", port))
_ = l.Close()
return err == nil
}

func GetPorts() (nodePort, peerPort uint32) {
portMutex.Lock()
defer portMutex.Unlock()

nodePort = nodePortBase
peerPort = peerPortBase
nodePortBase++
peerPortBase++
for nodePortBase < PortLimit && peerPortBase < PortLimit {
nodePort = nodePortBase
peerPort = peerPortBase
nodePortBase++
peerPortBase++

if testPort(nodePort) && testPort(peerPort) {
return
}
}

return
panic("Could not find available port for testing")
}