Move cgo portions of FreeBSD devstat collector into own file

Embedding 100 lines of code in a comment doesn't make for good reading,
editing or code quality.

collector/devstat_freebsd.c

@@ -0,0 +1,74 @@
+// +build !nodevstat
+
+#include <devstat.h>
+#include <fcntl.h>
+#include <libgeom.h>
+#include <limits.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <devstat_freebsd.h>
+
+int _get_ndevs() {
+	struct statinfo current;
+	struct devinfo info = {};
+	current.dinfo = &info;
+
+	devstat_checkversion(NULL);
+
+	if (devstat_getdevs(NULL, &current) == -1)
+		return -1;
+
+	return current.dinfo->numdevs;
+}
+
+Stats _get_stats(int i) {
+	struct statinfo current;
+	struct devinfo info = {};
+	current.dinfo = &info;
+
+	devstat_getdevs(NULL, &current);
+
+	Stats stats;
+	uint64_t bytes_read, bytes_write, bytes_free;
+	uint64_t transfers_other, transfers_read, transfers_write, transfers_free;
+	long double duration_other, duration_read, duration_write, duration_free;
+	long double busy_time;
+	uint64_t blocks;
+
+	strcpy(stats.device, current.dinfo->devices[i].device_name);
+	stats.unit = current.dinfo->devices[i].unit_number;
+	devstat_compute_statistics(&current.dinfo->devices[i],
+		NULL,
+		1.0,
+		DSM_TOTAL_BYTES_READ, &bytes_read,
+		DSM_TOTAL_BYTES_WRITE, &bytes_write,
+		DSM_TOTAL_BYTES_FREE, &bytes_free,
+		DSM_TOTAL_TRANSFERS_OTHER, &transfers_other,
+		DSM_TOTAL_TRANSFERS_READ, &transfers_read,
+		DSM_TOTAL_TRANSFERS_WRITE, &transfers_write,
+		DSM_TOTAL_TRANSFERS_FREE, &transfers_free,
+		DSM_TOTAL_DURATION_OTHER, &duration_other,
+		DSM_TOTAL_DURATION_READ, &duration_read,
+		DSM_TOTAL_DURATION_WRITE, &duration_write,
+		DSM_TOTAL_DURATION_FREE, &duration_free,
+		DSM_TOTAL_BUSY_TIME, &busy_time,
+		DSM_TOTAL_BLOCKS, &blocks,
+		DSM_NONE);
+
+	stats.bytes.read = bytes_read;
+	stats.bytes.write = bytes_write;
+	stats.bytes.free = bytes_free;
+	stats.transfers.other = transfers_other;
+	stats.transfers.read = transfers_read;
+	stats.transfers.write = transfers_write;
+	stats.transfers.free = transfers_free;
+	stats.duration.other = duration_other;
+	stats.duration.read = duration_read;
+	stats.duration.write = duration_write;
+	stats.duration.free = duration_free;
+	stats.busyTime = busy_time;
+	stats.blocks = blocks;
+
+	return stats;
+}

collector/devstat_freebsd.go

@@ -22,110 +22,8 @@ import (
 	"github.com/prometheus/client_golang/prometheus"
 )
 
-/*
+// #cgo LDFLAGS: -ldevstat -lkvm
-#cgo LDFLAGS: -ldevstat -lkvm
+// #include "devstat_freebsd.h"
-#include <devstat.h>
-#include <fcntl.h>
-#include <libgeom.h>
-#include <limits.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-
-typedef struct {
-	uint64_t	read;
-	uint64_t	write;
-	uint64_t	free;
-} Bytes;
-
-typedef struct {
-	uint64_t	other;
-	uint64_t	read;
-	uint64_t	write;
-	uint64_t	free;
-} Transfers;
-
-typedef struct {
-	double		other;
-	double		read;
-	double		write;
-	double		free;
-} Duration;
-
-typedef struct {
-	char		device[DEVSTAT_NAME_LEN];
-	int		unit;
-	Bytes		bytes;
-	Transfers	transfers;
-	Duration	duration;
-	long		busyTime;
-	uint64_t	blocks;
-} Stats;
-
-int _get_ndevs() {
-	struct statinfo current;
-	struct devinfo info = {};
-	current.dinfo = &info;
-
-	devstat_checkversion(NULL);
-
-	if (devstat_getdevs(NULL, &current) == -1)
-		return -1;
-
-	return current.dinfo->numdevs;
-}
-
-Stats _get_stats(int i) {
-	struct statinfo current;
-	struct devinfo info = {};
-	current.dinfo = &info;
-
-	devstat_getdevs(NULL, &current);
-
-	Stats stats;
-	uint64_t bytes_read, bytes_write, bytes_free;
-	uint64_t transfers_other, transfers_read, transfers_write, transfers_free;
-	long double duration_other, duration_read, duration_write, duration_free;
-	long double busy_time;
-	uint64_t blocks;
-
-	strcpy(stats.device, current.dinfo->devices[i].device_name);
-	stats.unit = current.dinfo->devices[i].unit_number;
-	devstat_compute_statistics(&current.dinfo->devices[i],
-		NULL,
-		1.0,
-		DSM_TOTAL_BYTES_READ, &bytes_read,
-		DSM_TOTAL_BYTES_WRITE, &bytes_write,
-		DSM_TOTAL_BYTES_FREE, &bytes_free,
-		DSM_TOTAL_TRANSFERS_OTHER, &transfers_other,
-		DSM_TOTAL_TRANSFERS_READ, &transfers_read,
-		DSM_TOTAL_TRANSFERS_WRITE, &transfers_write,
-		DSM_TOTAL_TRANSFERS_FREE, &transfers_free,
-		DSM_TOTAL_DURATION_OTHER, &duration_other,
-		DSM_TOTAL_DURATION_READ, &duration_read,
-		DSM_TOTAL_DURATION_WRITE, &duration_write,
-		DSM_TOTAL_DURATION_FREE, &duration_free,
-		DSM_TOTAL_BUSY_TIME, &busy_time,
-		DSM_TOTAL_BLOCKS, &blocks,
-		DSM_NONE);
-
-	stats.bytes.read = bytes_read;
-	stats.bytes.write = bytes_write;
-	stats.bytes.free = bytes_free;
-	stats.transfers.other = transfers_other;
-	stats.transfers.read = transfers_read;
-	stats.transfers.write = transfers_write;
-	stats.transfers.free = transfers_free;
-	stats.duration.other = duration_other;
-	stats.duration.read = duration_read;
-	stats.duration.write = duration_write;
-	stats.duration.free = duration_free;
-	stats.busyTime = busy_time;
-	stats.blocks = blocks;
-
-	return stats;
-}
-*/
 import "C"
 
 const (

collector/devstat_freebsd.h

@@ -0,0 +1,41 @@
+#include <devstat.h>
+#include <fcntl.h>
+#include <libgeom.h>
+#include <limits.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+typedef struct {
+	uint64_t	read;
+	uint64_t	write;
+	uint64_t	free;
+} Bytes;
+
+typedef struct {
+	uint64_t	other;
+	uint64_t	read;
+	uint64_t	write;
+	uint64_t	free;
+} Transfers;
+
+typedef struct {
+	double		other;
+	double		read;
+	double		write;
+	double		free;
+} Duration;
+
+typedef struct {
+	char		device[DEVSTAT_NAME_LEN];
+	int		unit;
+	Bytes		bytes;
+	Transfers	transfers;
+	Duration	duration;
+	long		busyTime;
+	uint64_t	blocks;
+} Stats;
+
+
+int _get_ndevs();
+Stats _get_stats(int i);