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portping_test.go
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portping_test.go
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package portping
import (
"testing"
"net"
"strings"
"time"
"strconv"
)
const (
testHost = "localhost"
knownNonexistentHost = "nonexistent.janosgyerik.com"
defaultTimeout = 5 * time.Second
testNetwork = "tcp"
)
var testPort = findKnownAvailablePort()
func findKnownAvailablePort() string {
tcpa, err := net.ResolveTCPAddr("tcp", ":0")
if err != nil {
panic(err)
}
ln, err := net.ListenTCP("tcp", tcpa)
if err != nil {
panic(err)
}
defer ln.Close()
local, ok := ln.Addr().(*net.TCPAddr)
if !ok {
panic("Unable to convert Addr to TCPAddr")
}
return strconv.Itoa(local.Port)
}
func acceptN(t*testing.T, host, port string, count int) {
ready := make(chan bool)
go func() {
ln, err := net.Listen(testNetwork, net.JoinHostPort(host, port))
if err != nil {
t.Fatal(err)
}
defer ln.Close()
ready <- true
for i := 0; i < count; i++ {
conn, err := ln.Accept()
if err != nil {
t.Fatal(err)
}
conn.Close()
}
}()
<-ready
}
func assertPingResult(t*testing.T, host, port string, expectSuccess bool, patterns ...string) {
addr := net.JoinHostPort(host, port)
err := Ping(testNetwork, addr, defaultTimeout)
t.Logf("port ping %s -> %v", addr, err)
if err != nil {
if expectSuccess {
t.Errorf("ping to %s failed; expected success", addr)
} else {
assertErrorContains(t, err, patterns...)
}
} else {
if !expectSuccess {
t.Errorf("ping to %s success; expected failure", addr)
}
}
}
func assertErrorContains(t*testing.T, err error, patterns ...string) {
result := err.Error()
foundMatch := false
for _, pattern := range patterns {
if strings.Contains(result, pattern) {
foundMatch = true
break
}
}
if !foundMatch {
t.Errorf("got '%s'; expected to contain one of '%s'", result, patterns)
}
}
func assertPingFailure(t*testing.T, host, port string, patterns ...string) {
assertPingResult(t, host, port, false, patterns...)
}
func assertPingNSuccessCount(t*testing.T, host, port string, pingCount int, expectedSuccessCount int) {
c := make(chan error)
addr := net.JoinHostPort(host, port)
go PingN(testNetwork, addr, defaultTimeout, pingCount, c)
failureCount := 0
for i := 0; i < pingCount; i++ {
err := <-c
t.Logf("port ping %s [%d] -> %v", addr, i + 1, err)
if err != nil {
failureCount++
}
}
successCount := pingCount - failureCount
if successCount != expectedSuccessCount {
t.Errorf("expected %d successful pings, but got %d", expectedSuccessCount, successCount)
}
}
func Test_ping_open_port(t*testing.T) {
acceptN(t, testHost, testPort, 1)
assertPingResult(t, testHost, testPort, true)
// for sanity: acceptN should have shut down already
// note: "connection reset" is seen in Linux, I suspect acceptN hasn't shut down yet
assertPingFailure(t, testHost, testPort, "connection refused", "connection reset")
}
func Test_ping_unopen_port(t*testing.T) {
assertPingFailure(t, testHost, testPort, "connection refused")
}
func Test_ping_nonexistent_host(t*testing.T) {
assertPingFailure(t, knownNonexistentHost, testPort, "no such host")
}
func Test_ping_negative_port(t*testing.T) {
assertPingFailure(t, testHost, "-1", "invalid port", "unknown port")
}
func Test_ping_too_high_port(t*testing.T) {
assertPingFailure(t, testHost, "123456", "invalid port", "unknown port")
}
func Test_ping3_all_success(t*testing.T) {
pingCount := 3
acceptN(t, testHost, testPort, pingCount)
assertPingNSuccessCount(t, testHost, testPort, pingCount, pingCount)
}
func Test_ping3_all_fail(t*testing.T) {
pingCount := 3
successCount := 0
assertPingNSuccessCount(t, testHost, testPort, pingCount, successCount)
}
func Test_ping5_partial_success(t*testing.T) {
successCount := 3
acceptN(t, testHost, testPort, successCount)
pingCount := 5
assertPingNSuccessCount(t, testHost, testPort, pingCount, successCount)
}