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Merge pull request #385 from dominikh/freebsd-no-c

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Replace some FreeBSD collectors with pure Go versions
This commit is contained in:
Julius Volz 2016-12-31 12:30:37 +01:00 committed by GitHub
parent a0b6f55aa9 f0adcd163d
commit 269ee7a7b4
6 changed files with 189 additions and 150 deletions
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160
collector/cpu_freebsd.go
View file

@ -16,95 +16,67 @@
package collector
import (
"errors"
"strconv"
"unsafe"
"github.com/prometheus/client_golang/prometheus"
"golang.org/x/sys/unix"
)
/*
#cgo LDFLAGS:
#include <fcntl.h>
#include <stdlib.h>
#include <sys/param.h>
#include <sys/pcpu.h>
#include <sys/resource.h>
#include <sys/sysctl.h>
#include <sys/time.h>
static int mibs_set_up = 0;
static int mib_kern_cp_times[2];
static size_t mib_kern_cp_times_len = 2;
static const int mib_hw_ncpu[] = {CTL_HW, HW_NCPU};
static const size_t mib_hw_ncpu_len = 2;
static const int mib_kern_clockrate[] = {CTL_KERN, KERN_CLOCKRATE};
static size_t mib_kern_clockrate_len = 2;
// Setup method for MIBs not available as constants.
// Calls to this method must be synchronized externally.
int setupSysctlMIBs() {
int ret = sysctlnametomib("kern.cp_times", mib_kern_cp_times, &mib_kern_cp_times_len);
if (ret == 0) mibs_set_up = 1;
return ret;
type clockinfo struct {
hz int32 // clock frequency
tick int32 // micro-seconds per hz tick
spare int32
stathz int32 // statistics clock frequency
profhz int32 // profiling clock frequency
}
int getCPUTimes(int *ncpu, double **cpu_times, size_t *cp_times_length) {
// Assert that mibs are set up through setupSysctlMIBs
if (!mibs_set_up) {
return -1;
}
// Retrieve number of cpu cores
size_t ncpu_size = sizeof(*ncpu);
if (sysctl(mib_hw_ncpu, mib_hw_ncpu_len, ncpu, &ncpu_size, NULL, 0) == -1 ||
sizeof(*ncpu) != ncpu_size) {
return -1;
}
// Retrieve clockrate
struct clockinfo clockrate;
size_t clockrate_size = sizeof(clockrate);
if (sysctl(mib_kern_clockrate, mib_kern_clockrate_len, &clockrate, &clockrate_size, NULL, 0) == -1 ||
sizeof(clockrate) != clockrate_size) {
return -1;
}
// Retrieve cp_times values
*cp_times_length = (*ncpu) * CPUSTATES;
long cp_times[*cp_times_length];
size_t cp_times_size = sizeof(cp_times);
if (sysctl(mib_kern_cp_times, mib_kern_cp_times_len, &cp_times, &cp_times_size, NULL, 0) == -1 ||
sizeof(cp_times) != cp_times_size) {
return -1;
}
// Compute absolute time for different CPU states
long cpufreq = clockrate.stathz > 0 ? clockrate.stathz : clockrate.hz;
*cpu_times = (double *) malloc(sizeof(double)*(*cp_times_length));
for (int i = 0; i < (*cp_times_length); i++) {
(*cpu_times)[i] = ((double) cp_times[i]) / cpufreq;
}
return 0;
type cputime struct {
user float64
nice float64
sys float64
intr float64
idle float64
}
void freeCPUTimes(double *cpu_times) {
free(cpu_times);
func getCPUTimes() ([]cputime, error) {
const states = 5
clockb, err := unix.SysctlRaw("kern.clockrate")
if err != nil {
return nil, err
}
clock := *(*clockinfo)(unsafe.Pointer(&clockb[0]))
cpb, err := unix.SysctlRaw("kern.cp_times")
if err != nil {
return nil, err
}
var cpufreq float64
if clock.stathz > 0 {
cpufreq = float64(clock.stathz)
} else {
cpufreq = float64(clock.hz)
}
var times []float64
for len(cpb) >= int(unsafe.Sizeof(int(0))) {
t := *(*int)(unsafe.Pointer(&cpb[0]))
times = append(times, float64(t)/cpufreq)
cpb = cpb[unsafe.Sizeof(int(0)):]
}
cpus := make([]cputime, len(times)/states)
for i := 0; i < len(times); i += states {
cpu := &cpus[i/states]
cpu.user = times[i]
cpu.nice = times[i+1]
cpu.sys = times[i+2]
cpu.intr = times[i+3]
cpu.idle = times[i+4]
}
return cpus, nil
}
*/
import "C"
const maxCPUTimesLen = C.MAXCPU * C.CPUSTATES
type statCollector struct {
cpu *prometheus.CounterVec
}
@ -116,9 +88,6 @@ func init() {
// Takes a prometheus registry and returns a new Collector exposing
// CPU stats.
func NewStatCollector() (Collector, error) {
if C.setupSysctlMIBs() == -1 {
return nil, errors.New("could not initialize sysctl MIBs")
}
return &statCollector{
cpu: prometheus.NewCounterVec(
prometheus.CounterOpts{
@ -133,7 +102,6 @@ func NewStatCollector() (Collector, error) {
// Expose CPU stats using sysctl.
func (c *statCollector) Update(ch chan<- prometheus.Metric) (err error) {
// We want time spent per-cpu per CPUSTATE.
// CPUSTATES (number of CPUSTATES) is defined as 5U.
// Order: CP_USER | CP_NICE | CP_SYS | CP_IDLE | CP_INTR
@ -145,29 +113,17 @@ func (c *statCollector) Update(ch chan<- prometheus.Metric) (err error) {
//
// Look into sys/kern/kern_clock.c for details.
var ncpu C.int
var cpuTimesC *C.double
var cpuTimesLength C.size_t
if C.getCPUTimes(&ncpu, &cpuTimesC, &cpuTimesLength) == -1 {
return errors.New("could not retrieve CPU times")
cpuTimes, err := getCPUTimes()
if err != nil {
return err
}
defer C.freeCPUTimes(cpuTimesC)
if cpuTimesLength > maxCPUTimesLen {
return errors.New("more CPU's than MAXCPU?")
for cpu, t := range cpuTimes {
c.cpu.With(prometheus.Labels{"cpu": strconv.Itoa(cpu), "mode": "user"}).Set(t.user)
c.cpu.With(prometheus.Labels{"cpu": strconv.Itoa(cpu), "mode": "nice"}).Set(t.nice)
c.cpu.With(prometheus.Labels{"cpu": strconv.Itoa(cpu), "mode": "system"}).Set(t.sys)
c.cpu.With(prometheus.Labels{"cpu": strconv.Itoa(cpu), "mode": "interrupt"}).Set(t.intr)
c.cpu.With(prometheus.Labels{"cpu": strconv.Itoa(cpu), "mode": "idle"}).Set(t.idle)
}
// Convert C.double array to Go array (https://github.com/golang/go/wiki/cgo#turning-c-arrays-into-go-slices).
cpuTimes := (*[maxCPUTimesLen]C.double)(unsafe.Pointer(cpuTimesC))[:cpuTimesLength:cpuTimesLength]
for cpu := 0; cpu < int(ncpu); cpu++ {
base_idx := C.CPUSTATES * cpu
c.cpu.With(prometheus.Labels{"cpu": strconv.Itoa(cpu), "mode": "user"}).Set(float64(cpuTimes[base_idx+C.CP_USER]))
c.cpu.With(prometheus.Labels{"cpu": strconv.Itoa(cpu), "mode": "nice"}).Set(float64(cpuTimes[base_idx+C.CP_NICE]))
c.cpu.With(prometheus.Labels{"cpu": strconv.Itoa(cpu), "mode": "system"}).Set(float64(cpuTimes[base_idx+C.CP_SYS]))
c.cpu.With(prometheus.Labels{"cpu": strconv.Itoa(cpu), "mode": "interrupt"}).Set(float64(cpuTimes[base_idx+C.CP_INTR]))
c.cpu.With(prometheus.Labels{"cpu": strconv.Itoa(cpu), "mode": "idle"}).Set(float64(cpuTimes[base_idx+C.CP_IDLE]))
}
c.cpu.Collect(ch)
return err
}

2
collector/filesystem_bsd.go
View file

@ -11,7 +11,7 @@
// See the License for the specific language governing permissions and
// limitations under the License.
// +build freebsd openbsd darwin,amd64 dragonfly
// +build openbsd darwin,amd64 dragonfly
// +build !nofilesystem
package collector

88
collector/filesystem_freebsd.go Normal file
View file

@ -0,0 +1,88 @@
// Copyright 2015 The Prometheus Authors
// 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.
// +build !nofilesystem
package collector
import (
"bytes"
"unsafe"
"github.com/prometheus/common/log"
"golang.org/x/sys/unix"
)
const (
defIgnoredMountPoints = "^/(dev)($|/)"
defIgnoredFSTypes = "^devfs$"
MNT_RDONLY = 0x1
MNT_NOWAIT = 0x2
)
func gostring(b []int8) string {
bb := *(*[]byte)(unsafe.Pointer(&b))
idx := bytes.IndexByte(bb, 0)
if idx < 0 {
return ""
}
return string(bb[:idx])
}
// Expose filesystem fullness.
func (c *filesystemCollector) GetStats() (stats []filesystemStats, err error) {
buf := make([]unix.Statfs_t, 16)
for {
n, err := unix.Getfsstat(buf, MNT_NOWAIT)
if err != nil {
return nil, err
}
if n < len(buf) {
buf = buf[:n]
break
}
buf = make([]unix.Statfs_t, len(buf)*2)
}
stats = []filesystemStats{}
for _, fs := range buf {
mountpoint := gostring(fs.Mntonname[:])
if c.ignoredMountPointsPattern.MatchString(mountpoint) {
log.Debugf("Ignoring mount point: %s", mountpoint)
continue
}
device := gostring(fs.Mntfromname[:])
fstype := gostring(fs.Fstypename[:])
if c.ignoredFSTypesPattern.MatchString(fstype) {
log.Debugf("Ignoring fs type: %s", fstype)
continue
}
var ro float64
if (fs.Flags & MNT_RDONLY) != 0 {
ro = 1
}
labelValues := []string{device, mountpoint, fstype}
stats = append(stats, filesystemStats{
labelValues: labelValues,
size: float64(fs.Blocks) * float64(fs.Bsize),
free: float64(fs.Bfree) * float64(fs.Bsize),
avail: float64(fs.Bavail) * float64(fs.Bsize),
files: float64(fs.Files),
filesFree: float64(fs.Ffree),
ro: ro,
})
}
return stats, nil
}

27
collector/loadavg_freebsd.go Normal file
View file

@ -0,0 +1,27 @@
// +build !noloadavg
package collector
import (
"unsafe"
"golang.org/x/sys/unix"
)
func getLoad() ([]float64, error) {
type loadavg struct {
load [3]uint32
scale int
}
b, err := unix.SysctlRaw("vm.loadavg")
if err != nil {
return nil, err
}
load := *(*loadavg)(unsafe.Pointer((&b[0])))
scale := float64(load.scale)
return []float64{
float64(load.load[0]) / scale,
float64(load.load[1]) / scale,
float64(load.load[2]) / scale,
}, nil
}

2
collector/loadavg_unix.go
View file

@ -11,7 +11,7 @@
// See the License for the specific language governing permissions and
// limitations under the License.
// +build darwin dragonfly freebsd netbsd openbsd solaris
// +build darwin dragonfly netbsd openbsd solaris
// +build !noloadavg
package collector

60
collector/meminfo_bsd.go
View file

@ -17,30 +17,12 @@
package collector
import (
"errors"
"fmt"
"github.com/prometheus/client_golang/prometheus"
"golang.org/x/sys/unix"
)
/*
#include <stddef.h>
#include <sys/sysctl.h>
int _sysctl(const char* name) {
int val;
size_t size = sizeof(val);
int res = sysctlbyname(name, &val, &size, NULL, 0);
if (res == -1) {
return -1;
}
if (size != sizeof(val)) {
return -2;
}
return val;
}
*/
import "C"
const (
memInfoSubsystem = "memory"
)
@ -58,34 +40,20 @@ func NewMeminfoCollector() (Collector, error) {
}
func (c *meminfoCollector) Update(ch chan<- prometheus.Metric) (err error) {
var pages map[string]C.int
pages = make(map[string]C.int)
pages := make(map[string]uint32)
size := C._sysctl(C.CString("vm.stats.vm.v_page_size"))
if size == -1 {
return errors.New("sysctl(vm.stats.vm.v_page_size) failed")
}
if size == -2 {
return errors.New("sysctl(vm.stats.vm.v_page_size) failed, wrong buffer size")
}
pages["active"] = C._sysctl(C.CString("vm.stats.vm.v_active_count"))
pages["inactive"] = C._sysctl(C.CString("vm.stats.vm.v_inactive_count"))
pages["wire"] = C._sysctl(C.CString("vm.stats.vm.v_wire_count"))
pages["cache"] = C._sysctl(C.CString("vm.stats.vm.v_cache_count"))
pages["free"] = C._sysctl(C.CString("vm.stats.vm.v_free_count"))
pages["swappgsin"] = C._sysctl(C.CString("vm.stats.vm.v_swappgsin"))
pages["swappgsout"] = C._sysctl(C.CString("vm.stats.vm.v_swappgsout"))
pages["total"] = C._sysctl(C.CString("vm.stats.vm.v_page_count"))
for key := range pages {
if pages[key] == -1 {
return errors.New("sysctl() failed for " + key)
}
if pages[key] == -2 {
return errors.New("sysctl() failed for " + key + ", wrong buffer size")
}
size, err := unix.SysctlUint32("vm.stats.vm.v_page_size")
if err != nil {
return fmt.Errorf("sysctl(vm.stats.vm.v_page_size) failed: %s", err)
}
pages["active"], _ = unix.SysctlUint32("vm.stats.vm.v_active_count")
pages["inactive"], _ = unix.SysctlUint32("vm.stats.vm.v_inactive_count")
pages["wire"], _ = unix.SysctlUint32("vm.stats.vm.v_wire_count")
pages["cache"], _ = unix.SysctlUint32("vm.stats.vm.v_cache_count")
pages["free"], _ = unix.SysctlUint32("vm.stats.vm.v_free_count")
pages["swappgsin"], _ = unix.SysctlUint32("vm.stats.vm.v_swappgsin")
pages["swappgsout"], _ = unix.SysctlUint32("vm.stats.vm.v_swappgsout")
pages["total"], _ = unix.SysctlUint32("vm.stats.vm.v_page_count")
for k, v := range pages {
ch <- prometheus.MustNewConstMetric(