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probe.go
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probe.go
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// Copyright (c) 2020-2021 C4 Project
//
// This file is part of c4t.
// Licenced under the MIT licence; see `LICENSE`.
package machine
import (
"errors"
"fmt"
"os"
"runtime"
"github.com/c4-project/c4t/internal/id"
)
// Prober contains functionality for probing various parts of a machine.
type Prober interface {
// Hostname gets the full hostname of the machine.
Hostname() (string, error)
// NCores gets the number of cores available for the machine.
NCores() (int, error)
// Arch gets the architecture ID for the machine.
Arch() (id.ID, error)
}
//go:generate mockery --name=Prober
// LocalProber gets a prober that probes the local system.
func LocalProber() Prober {
return localProber{}
}
// localProber implements MachineProber using various local runtime/OS calls.
type localProber struct{}
// Hostname gets the full hostname of the local machine.
func (localProber) Hostname() (string, error) {
return os.Hostname()
}
// NCores gets the number of cores on the local machine.
func (localProber) NCores() (int, error) {
return runtime.NumCPU(), nil
}
// Arch gets the architecture using GOARCH.
func (localProber) Arch() (id.ID, error) {
return ArchOfGOARCH(runtime.GOARCH)
}
// ErrUnsupportedGOARCH occurs when a GOARCH not supported by the prober occurs
var ErrUnsupportedGOARCH = errors.New("local GOARCH not supported by prober")
// ArchOfGOARCH maps from the Go architecture goarch to a C4 architecture id.
// It fails with ErrUnsupportedGOARCH if the architecture isn't supported by C4.
func ArchOfGOARCH(goarch string) (id.ID, error) {
switch goarch {
case "386":
return id.ArchX86, nil
case "amd64":
return id.ArchX8664, nil
case "arm":
return id.ArchArm, nil
case "arm64":
return id.ArchAArch64, nil
case "ppc64le":
return id.ArchPPC64LE, nil
default:
return id.ID{}, fmt.Errorf("%w: %s", ErrUnsupportedGOARCH, goarch)
}
}
// Probe populates this config using the prober m.
func (c *Config) Probe(m Prober) error {
var err error
if c.Cores, err = m.NCores(); err != nil {
return err
}
if c.Arch, err = m.Arch(); err != nil {
return err
}
return nil
}