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64 lines
1.9 KiB
Go
64 lines
1.9 KiB
Go
/*
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Copyright 2015 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package tcp
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import (
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"net"
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"strconv"
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"time"
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"k8s.io/kubernetes/pkg/probe"
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"k8s.io/klog/v2"
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)
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// New creates Prober.
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func New() Prober {
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return tcpProber{}
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}
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// Prober is an interface that defines the Probe function for doing TCP readiness/liveness checks.
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type Prober interface {
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Probe(host string, port int, timeout time.Duration) (probe.Result, string, error)
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}
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type tcpProber struct{}
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// Probe checks that a TCP connection to the address can be opened.
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func (pr tcpProber) Probe(host string, port int, timeout time.Duration) (probe.Result, string, error) {
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return DoTCPProbe(net.JoinHostPort(host, strconv.Itoa(port)), timeout)
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}
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// DoTCPProbe checks that a TCP socket to the address can be opened.
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// If the socket can be opened, it returns Success
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// If the socket fails to open, it returns Failure.
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// This is exported because some other packages may want to do direct TCP probes.
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func DoTCPProbe(addr string, timeout time.Duration) (probe.Result, string, error) {
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d := probe.ProbeDialer()
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d.Timeout = timeout
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conn, err := d.Dial("tcp", addr)
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if err != nil {
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// Convert errors to failures to handle timeouts.
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return probe.Failure, err.Error(), nil
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}
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err = conn.Close()
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if err != nil {
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klog.Errorf("Unexpected error closing TCP probe socket: %v (%#v)", err, err)
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}
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return probe.Success, "", nil
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}
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