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ping.go
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ping.go
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// -*- Mode: Go; indent-tabs-mode: t -*-
/*
* Copyright (C) 2018 Roberto Mier Escandon <rmescandon@gmail.com>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 3 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
package watchdog
import (
"fmt"
"github.com/pkg/errors"
"github.com/greenbrew/rest/client"
"github.com/greenbrew/rest/system"
)
// Pinger method to ping the REST service
type Pinger interface {
Ping() bool
}
type pinger struct {
c client.Client
}
// DefaultPinger returns a default implementation for Pinger interface using
// a REST client pointing to a local unix socket
func DefaultPinger(unixSocketPath string) (Pinger, error) {
if len(unixSocketPath) == 0 {
return nil, errors.New("Empty unix socket path provided")
}
if !system.PathExists(unixSocketPath) {
return nil, errors.New("Unix socket path does not exist")
}
c, err := client.New(unixSocketPath, nil)
if err != nil {
return nil, fmt.Errorf("Could not start watchdog client: %v", err)
}
return &pinger{c}, nil
}
func (p *pinger) Ping() bool {
_, _, err := p.c.CallAPI("GET", client.APIPath("version"), nil, nil, nil, "")
// The error is not relevant, only the fact that the endpoint
// is reachable or not
return err == nil
}