/
admin.go
318 lines (266 loc) · 8.09 KB
/
admin.go
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/*
* Copyright (c) 2020, NVIDIA CORPORATION. All rights reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package dcgm
/*
#cgo linux LDFLAGS: -ldl -Wl,--export-dynamic -Wl,--unresolved-symbols=ignore-in-object-files
#cgo darwin LDFLAGS: -ldl -Wl,--export-dynamic -Wl,-undefined,dynamic_lookup
#include <dlfcn.h>
#include "dcgm_agent.h"
#include "dcgm_structs.h"
*/
import "C"
import (
"fmt"
"io/ioutil"
"log"
"os"
"os/exec"
"strconv"
"strings"
"syscall"
"unsafe"
"github.com/Masterminds/semver"
)
type mode int
// const for DCGM hostengine running modes: Embedded, Standalone or StartHostengine
const (
Embedded mode = iota
Standalone
StartHostengine
)
type dcgmHandle struct{ handle C.dcgmHandle_t }
var (
dcgmLibHandle unsafe.Pointer
stopMode mode
handle dcgmHandle
hostengineAsChildPid int
)
func initDcgm(m mode, args ...string) (err error) {
const (
dcgmLib = "libdcgm.so"
)
lib := C.CString(dcgmLib)
defer freeCString(lib)
dcgmLibHandle = C.dlopen(lib, C.RTLD_LAZY|C.RTLD_GLOBAL)
if dcgmLibHandle == nil {
return fmt.Errorf("%s not Found", dcgmLib)
}
// set the stopMode for shutdown()
stopMode = m
switch m {
case Embedded:
return startEmbedded()
case Standalone:
return connectStandalone(args...)
case StartHostengine:
return startHostengine()
}
return nil
}
func shutdown() (err error) {
switch stopMode {
case Embedded:
err = stopEmbedded()
case Standalone:
err = disconnectStandalone()
case StartHostengine:
err = stopHostengine()
}
C.dlclose(dcgmLibHandle)
return
}
func startEmbedded() (err error) {
result := C.dcgmInit()
if err = errorString(result); err != nil {
return fmt.Errorf("Error initializing DCGM: %s", err)
}
var cHandle C.dcgmHandle_t
result = C.dcgmStartEmbedded(C.DCGM_OPERATION_MODE_AUTO, &cHandle)
if err = errorString(result); err != nil {
return fmt.Errorf("Error starting nv-hostengine: %s", err)
}
handle = dcgmHandle{cHandle}
return
}
func stopEmbedded() (err error) {
result := C.dcgmStopEmbedded(handle.handle)
if err = errorString(result); err != nil {
return fmt.Errorf("Error stopping nv-hostengine: %s", err)
}
result = C.dcgmShutdown()
if err = errorString(result); err != nil {
return fmt.Errorf("Error shutting down DCGM: %s", err)
}
return
}
func connectStandalone(args ...string) (err error) {
if len(args) < 2 {
return fmt.Errorf("Missing dcgm address and / or port")
}
result := C.dcgmInit()
if err = errorString(result); err != nil {
return fmt.Errorf("Error initializing DCGM: %s", err)
}
var cHandle C.dcgmHandle_t
addr := C.CString(args[0])
defer freeCString(addr)
var connectParams C.dcgmConnectV2Params_v2
connectParams.version = makeVersion2(unsafe.Sizeof(connectParams))
sck, err := strconv.ParseUint(args[1], 10, 32)
if err != nil {
return fmt.Errorf("Error parsing %s: %v\n", args[1], err)
}
connectParams.addressIsUnixSocket = C.uint(sck)
result = C.dcgmConnect_v2(addr, &connectParams, &cHandle)
if err = errorString(result); err != nil {
return fmt.Errorf("Error connecting to nv-hostengine: %s", err)
}
handle = dcgmHandle{cHandle}
// This check is disabled for now
/*
err = checkHostengineVersion()
if err != nil {
return fmt.Errorf("Error connecting to remote nv-hostengine: %s", err)
}
*/
return
}
func disconnectStandalone() (err error) {
result := C.dcgmDisconnect(handle.handle)
if err = errorString(result); err != nil {
return fmt.Errorf("Error disconnecting from nv-hostengine: %s", err)
}
result = C.dcgmShutdown()
if err = errorString(result); err != nil {
return fmt.Errorf("Error shutting down DCGM: %s", err)
}
return
}
func startHostengine() (err error) {
bin, err := exec.LookPath("nv-hostengine")
if err != nil {
return fmt.Errorf("Error finding nv-hostengine: %s", err)
}
var procAttr syscall.ProcAttr
procAttr.Files = []uintptr{
uintptr(syscall.Stdin),
uintptr(syscall.Stdout),
uintptr(syscall.Stderr)}
procAttr.Sys = &syscall.SysProcAttr{Setpgid: true}
dir := "/tmp"
tmpfile, err := ioutil.TempFile(dir, "dcgm")
if err != nil {
return fmt.Errorf("Error creating temporary file in %s directory: %s", dir, err)
}
socketPath := tmpfile.Name()
defer os.Remove(socketPath)
connectArg := "--domain-socket"
hostengineAsChildPid, err = syscall.ForkExec(bin, []string{bin, connectArg, socketPath}, &procAttr)
if err != nil {
return fmt.Errorf("Error fork-execing nv-hostengine: %s", err)
}
result := C.dcgmInit()
if err = errorString(result); err != nil {
return fmt.Errorf("Error initializing DCGM: %s", err)
}
var cHandle C.dcgmHandle_t
var connectParams C.dcgmConnectV2Params_v2
connectParams.version = makeVersion2(unsafe.Sizeof(connectParams))
isSocket := C.uint(1)
connectParams.addressIsUnixSocket = isSocket
cSockPath := C.CString(socketPath)
defer freeCString(cSockPath)
result = C.dcgmConnect_v2(cSockPath, &connectParams, &cHandle)
if err = errorString(result); err != nil {
return fmt.Errorf("Error connecting to nv-hostengine: %s", err)
}
handle = dcgmHandle{cHandle}
return
}
func stopHostengine() (err error) {
if err = disconnectStandalone(); err != nil {
return
}
// terminate nv-hostengine
cmd := exec.Command("nv-hostengine", "--term")
if err = cmd.Run(); err != nil {
return fmt.Errorf("Error terminating nv-hostengine: %s", err)
}
log.Println("Successfully terminated nv-hostengine.")
return syscall.Kill(hostengineAsChildPid, syscall.SIGKILL)
}
func checkHostengineVersion() (err error) {
var hostEngineVersionInfo C.dcgmVersionInfo_t
hostEngineVersionInfo.version = makeVersion2(unsafe.Sizeof(hostEngineVersionInfo))
result := C.dcgmHostengineVersionInfo(handle.handle, &hostEngineVersionInfo)
if err = errorString(result); err != nil {
return fmt.Errorf("Could not retrieve running hostengine version: %s", err)
}
var versionInfo C.dcgmVersionInfo_t
versionInfo.version = makeVersion2(unsafe.Sizeof(versionInfo))
result = C.dcgmVersionInfo(&versionInfo)
if err = errorString(result); err != nil {
return fmt.Errorf("Could not retrieve dcgm version: %s", err)
}
/* Version string looks like: "version:2.1.2;arch:x86_64;buildtype:Debug;
* buildid:;builddate:2021-03-03;commit:v2.1.1-5-gc27ab30f;branch:master;
* buildplatform:Linux 5.4.0-66-generic #74~18.04.2-Ubuntu SMP Fri Feb 5
* 11:17:31 UTC 2021 x86_64;;crc:bd60aadd63245021163ef008d0907ae7"
*/
heVersionStr := C.GoString(&hostEngineVersionInfo.rawBuildInfoString[0])
myVersionStr := C.GoString(&versionInfo.rawBuildInfoString[0])
var foundVersion = false
he := strings.Split(heVersionStr, ";")
// Find version pair within build information
for _, line := range he {
if strings.HasPrefix(line, "version:") {
heVersionStr = line
foundVersion = true
}
}
if foundVersion == false {
return fmt.Errorf("Could not determine remote version")
}
foundVersion = false
my := strings.Split(myVersionStr, ";")
for _, line := range my {
if strings.HasPrefix(line, "version:") {
myVersionStr = line
foundVersion = true
}
}
if foundVersion == false {
return fmt.Errorf("Could not determine local version")
}
// Parse out version and compare
he = strings.Split(heVersionStr, ":")
my = strings.Split(myVersionStr, ":")
if (len(he) != 2) && (len(my) != 2) {
return fmt.Errorf("Could not parse versions")
}
heVersion, err := semver.NewVersion(he[1])
if err != nil {
return fmt.Errorf("Could not determine remote version: %s", err)
}
myVersion, err := semver.NewVersion(my[1])
if err != nil {
return fmt.Errorf("Could not determine local version: %s", err)
}
if heVersion.Major() != myVersion.Major() {
return fmt.Errorf("remote %v != local %v", he[1], my[1])
}
return
}