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dex/vendor/github.com/testcontainers/testcontainers-go/wait/host_port.go

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2020-01-31 15:02:00 +05:30
package wait
import (
"context"
"fmt"
"github.com/pkg/errors"
"net"
"os"
"strconv"
"syscall"
"time"
"github.com/docker/go-connections/nat"
)
// Implement interface
var _ Strategy = (*HostPortStrategy)(nil)
type HostPortStrategy struct {
Port nat.Port
// all WaitStrategies should have a startupTimeout to avoid waiting infinitely
startupTimeout time.Duration
}
// NewHostPortStrategy constructs a default host port strategy
func NewHostPortStrategy(port nat.Port) *HostPortStrategy {
return &HostPortStrategy{
Port: port,
startupTimeout: defaultStartupTimeout(),
}
}
// fluent builders for each property
// since go has neither covariance nor generics, the return type must be the type of the concrete implementation
// this is true for all properties, even the "shared" ones like startupTimeout
// ForListeningPort is a helper similar to those in Wait.java
// https://github.com/testcontainers/testcontainers-java/blob/1d85a3834bd937f80aad3a4cec249c027f31aeb4/core/src/main/java/org/testcontainers/containers/wait/strategy/Wait.java
func ForListeningPort(port nat.Port) *HostPortStrategy {
return NewHostPortStrategy(port)
}
func (hp *HostPortStrategy) WithStartupTimeout(startupTimeout time.Duration) *HostPortStrategy {
hp.startupTimeout = startupTimeout
return hp
}
// WaitUntilReady implements Strategy.WaitUntilReady
func (hp *HostPortStrategy) WaitUntilReady(ctx context.Context, target StrategyTarget) (err error) {
// limit context to startupTimeout
ctx, cancelContext := context.WithTimeout(ctx, hp.startupTimeout)
defer cancelContext()
ipAddress, err := target.Host(ctx)
if err != nil {
return
}
port, err := target.MappedPort(ctx, hp.Port)
if err != nil {
return
}
proto := port.Proto()
portNumber := port.Int()
portString := strconv.Itoa(portNumber)
//external check
dialer := net.Dialer{}
address := net.JoinHostPort(ipAddress, portString)
for {
conn, err := dialer.DialContext(ctx, proto, address)
defer conn.Close()
if err != nil {
if v, ok := err.(*net.OpError); ok {
if v2, ok := (v.Err).(*os.SyscallError); ok {
if v2.Err == syscall.ECONNREFUSED {
time.Sleep(100 * time.Millisecond)
continue
}
}
}
return err
}
break
}
//internal check
command := buildInternalCheckCommand(hp.Port.Int())
for {
exitCode, err := target.Exec(ctx, []string{"/bin/bash", "-c", command})
if err != nil {
return errors.Wrapf(err, "host port waiting failed")
}
if exitCode == 0 {
break
}
}
return nil
}
func buildInternalCheckCommand(internalPort int) string {
command := `(
cat /proc/net/tcp{,6} | awk '{print $2}' | grep -i :%x ||
nc -vz -w 1 localhost %d ||
/bin/bash -c '</dev/tcp/localhost/%d'
)
`
return "true && " + fmt.Sprintf(command, internalPort, internalPort, internalPort)
}