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// Copyright (c) Tailscale Inc & contributors
// SPDX-License-Identifier: BSD-3-Clause
package prober
import (
"context"
"fmt"
"net"
)
// TCP returns a Probe that healthchecks a TCP endpoint.
//
// The ProbeFunc reports whether it can successfully connect to addr.
func TCP(addr string) ProbeClass {
return ProbeClass{
Probe: func(ctx context.Context) error {
return probeTCP(ctx, addr)
},
Class: "tcp",
}
}
func probeTCP(ctx context.Context, addr string) error {
var d net.Dialer
conn, err := d.DialContext(ctx, "tcp", addr)
if err != nil {
return fmt.Errorf("dialing %q: %v", addr, err)
}
conn.Close()
return nil
}
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