如何用golang处理文本小计
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很简单的解决方案,原文格式更加,见笑。
Env
linux 64bit
go version go1.7.4 linux/amd64
physical machine
smartctl 6.2 2013-07-26 r3841 [x86_64-linux-3.10.0-327.36.2.el7.x86_64] (local build)
任务
使用smartctl命令收集物理机上的硬盘信息。需要的硬盘信息如下:
date: ‘2016-02-09’, string
serial_number: MJ0351YNG9Z0XA, string
model: Hitachi HDS5C3030ALA630, string
capacity_bytes: 3000592982016, string
normalize: 100, int
raw: 32296, string
以上需要的信息都可以通过smartctl
配合相关参数拿到,但是格式是很原始,需要我们根据需求抽取出真正需要的信息。
比如normalize
和raw
是硬盘的属性信息,可通过smartctl -A device
获取:
➜ ~ sudo smartctl -A /dev/sda smartctl 6.2 2013-07-26 r3841 [x86_64-linux-3.10.0-327.36.2.el7.x86_64] (local build) Copyright (C) 2002-13, Bruce Allen, Christian Franke, www.smartmontools.org === START OF READ SMART DATA SECTION === SMART Attributes Data Structure revision number: 10 Vendor Specific SMART Attributes with Thresholds: ID# ATTRIBUTE_NAME FLAG VALUE WORST THRESH TYPE UPDATED WHEN_FAILED RAW_VALUE 1 Raw_Read_Error_Rate 0x000f 118 099 006 Pre-fail Always - 199795992 3 Spin_Up_Time 0x0003 097 097 000 Pre-fail Always - 0 4 Start_Stop_Count 0x0032 100 100 020 Old_age Always - 149 5 Reallocated_Sector_Ct 0x0033 100 100 010 Pre-fail Always - 0 7 Seek_Error_Rate 0x000f 077 060 030 Pre-fail Always - 54764573 9 Power_On_Hours 0x0032 089 089 000 Old_age Always - 9792 10 Spin_Retry_Count 0x0013 100 100 097 Pre-fail Always - 0 12 Power_Cycle_Count 0x0032 100 100 020 Old_age Always - 149 183 Runtime_Bad_Block 0x0032 100 100 000 Old_age Always - 0 184 End-to-End_Error 0x0032 100 100 099 Old_age Always - 0 187 Reported_Uncorrect 0x0032 100 100 000 Old_age Always - 0 188 Command_Timeout 0x0032 100 099 000 Old_age Always - 2 2 2 189 High_Fly_Writes 0x003a 100 100 000 Old_age Always - 0 190 Airflow_Temperature_Cel 0x0022 060 055 045 Old_age Always - 40 (Min/Max 26/40) 191 G-Sense_Error_Rate 0x0032 100 100 000 Old_age Always - 0 192 Power-Off_Retract_Count 0x0032 100 100 000 Old_age Always - 25 193 Load_Cycle_Count 0x0032 098 098 000 Old_age Always - 4708 194 Temperature_Celsius 0x0022 040 045 000 Old_age Always - 40 (0 6 0 0 0) 197 Current_Pending_Sector 0x0012 100 100 000 Old_age Always - 0 198 Offline_Uncorrectable 0x0010 100 100 000 Old_age Offline - 0 199 UDMA_CRC_Error_Count 0x003e 200 200 000 Old_age Always - 0 240 Head_Flying_Hours 0x0000 100 253 000 Old_age Offline - 9049h+51m+35.226s 241 Total_LBAs_Written 0x0000 100 253 000 Old_age Offline - 4749106878 242 Total_LBAs_Read 0x0000 100 253 000 Old_age Offline - 126575500815
厂商这类静态信息可通过sudo smartctl -i device
获取:
➜ ~ sudo smartctl -i /dev/sda smartctl 6.2 2013-07-26 r3841 [x86_64-linux-3.10.0-327.36.2.el7.x86_64] (local build) Copyright (C) 2002-13, Bruce Allen, Christian Franke, www.smartmontools.org === START OF INFORMATION SECTION === Model Family: Seagate Barracuda 7200.14 (AF) Device Model: ST1000DM003-1ER162 Serial Number: W4Y3Z28A LU WWN Device Id: 5 000c50 08a2c464e Firmware Version: CC46 User Capacity: 1,000,204,886,016 bytes [1.00 TB] Sector Sizes: 512 bytes logical, 4096 bytes physical Rotation Rate: 7200 rpm Device is: In smartctl database [for details use: -P show] ATA Version is: ACS-2, ACS-3 T13/2161-D revision 3b SATA Version is: SATA 3.1, 6.0 Gb/s (current: 6.0 Gb/s) Local Time is: Tue Feb 7 17:53:34 2017 CST ==> WARNING: A firmware update for this drive is available, see the following Seagate web pages: http://knowledge.seagate.com/articles/en_US/FAQ/207931en http://knowledge.seagate.com/articles/en_US/FAQ/223651en SMART support is: Available - device has SMART capability. SMART support is: Enabled
我们该如何把里面的数据抽取出来呢?
想到的方法
正则表达式
strings(golang stdlib):处理字符串,分割、删除等
strconv (golang stdlib):处理字符串转换。
os/exec:执行smartctl脚本,获取输出
注意事项
对于格式确定的文本,尽量根据格式过滤掉不需要的数据,只保留需要的数据。
lines := " data1\n data2\n needed1\n needed2\n needed := strings.Split(lines, " ")
对于分割,通常strings.Fields()优于strings.Split()。
package mainimport( "strings" "fmt")func main() { lines := "194 Temperature_Celsius 0x0022 037 045 000 Old_age Always - 37 (0 6 0 0 0)" useSplit(lines) useFields(lines) }func useSplit(lines string) { line := strings.Split(lines, " ") fmt.Println(line) fmt.Println(len(line)) }func useFields(lines string) { line := strings.Fields(lines) fmt.Println(line) fmt.Println(len(line)) }/* output ➜ gist go run main.go [194 Temperature_Celsius 0x0022 037 045 000 Old_age Always - 37 (0 6 0 0 0)] 42 [194 Temperature_Celsius 0x0022 037 045 000 Old_age Always - 37 (0 6 0 0 0)] 15 */
exec获取bash script的输出信息默认结尾是带一个
\n
换行符的,要记得处理掉:
package mainimport( "os/exec" "os" "fmt")func main() { devices := getDevices() fmt.Println(devices) fmt.Println(len(devices)) }func getDevices() []string { ret, err := exec.Command("/sbin/smartctl", "--scan").Output() if err != nil { log.Println("Execute /sbin/smartctl --scan error: %v", err) os.Exit(-1) } linest := strings.Split(string(ret), "\n") lines := linest[:len(linest)-1] // remove last extra line with output of bash command var devList = []string{} for _, line := range lines { device := strings.Fields(line)[0] devList = append(devList, device) } return devList }/* remove extra line [/dev/sda] 1 not remove extra line [/dev/sda ] 2 */
到此,关于“如何用golang处理文本小计”的学习就结束了,希望能够解决大家的疑惑。理论与实践的搭配能更好的帮助大家学习,快去试试吧!若想继续学习更多相关知识,请继续关注创新互联网站,小编会继续努力为大家带来更多实用的文章!
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