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func calcNodeScoreTest(ip string) error {
	// call url
	body := "[{\"read\":\"2016-12-05T08:12:50.796867949Z\",\"preread\":\"2016-12-05T08:12:49.852566599Z\",\"pids_stats\":{},\"blkio_stats\":{\"io_service_bytes_recursive\":[],\"io_serviced_recursive\":[],\"io_queue_recursive\":[],\"io_service_time_recursive\":[],\"io_wait_time_recursive\":[],\"io_merged_recursive\":[],\"io_time_recursive\":[],\"sectors_recursive\":[]},\"num_procs\":0,\"storage_stats\":{},\"cpu_stats\":{\"cpu_usage\":{\"total_usage\":931578342,\"percpu_usage\":[194554633,446908218,85914365,204201126],\"usage_in_kernelmode\":780000000,\"usage_in_usermode\":120000000},\"system_cpu_usage\":109986170000000,\"throttling_data\":{\"periods\":0,\"throttled_periods\":0,\"throttled_time\":0}},\"precpu_stats\":{\"cpu_usage\":{\"total_usage\":931578342,\"percpu_usage\":[194554633,446908218,85914365,204201126],\"usage_in_kernelmode\":780000000,\"usage_in_usermode\":120000000},\"system_cpu_usage\":109982210000000,\"throttling_data\":{\"periods\":0,\"throttled_periods\":0,\"throttled_time\":0}},\"memory_stats\":{\"usage\":102400,\"max_usage\":569344,\"stats\":{\"active_anon\":61440,\"active_file\":0,\"cache\":0,\"dirty\":0,\"hierarchical_memory_limit\":8796093018112,\"inactive_anon\":0,\"inactive_file\":0,\"mapped_file\":0,\"pgfault\":24956,\"pgmajfault\":0,\"pgpgin\":9933,\"pgpgout\":9918,\"rss\":61440,\"rss_huge\":0,\"total_active_anon\":61440,\"total_active_file\":0,\"total_cache\":0,\"total_dirty\":0,\"total_inactive_anon\":0,\"total_inactive_file\":0,\"total_mapped_file\":0,\"total_pgfault\":24956,\"total_pgmajfault\":0,\"total_pgpgin\":9933,\"total_pgpgout\":9918,\"total_rss\":61440,\"total_rss_huge\":0,\"total_unevictable\":0,\"total_writeback\":0,\"unevictable\":0,\"writeback\":0},\"limit\":970485760},\"name\":\"/test1.10.it8zxjz40ghczwxbuf6o9kqx1\",\"id\":\"fd1a36c95fcadd60d193b6e3cf62a55b67b066d7d07da2487ec9deadf303cb6b\",\"networks\":{\"eth0\":{\"rx_bytes\":101501,\"rx_packets\":337,\"rx_errors\":0,\"rx_dropped\":4,\"tx_bytes\":1535,\"tx_packets\":15,\"tx_errors\":0,\"tx_dropped\":0}}},{\"read\":\"2016-12-05T08:12:52.796912007Z\",\"preread\":\"2016-12-05T08:12:51.876956563Z\",\"pids_stats\":{},\"blkio_stats\":{\"io_service_bytes_recursive\":[{\"major\":179,\"minor\":0,\"op\":\"Read\",\"value\":835584},{\"major\":179,\"minor\":0,\"op\":\"Write\",\"value\":0},{\"major\":179,\"minor\":0,\"op\":\"Sync\",\"value\":0},{\"major\":179,\"minor\":0,\"op\":\"Async\",\"value\":835584},{\"major\":179,\"minor\":0,\"op\":\"Total\",\"value\":835584}],\"io_serviced_recursive\":[{\"major\":179,\"minor\":0,\"op\":\"Read\",\"value\":14},{\"major\":179,\"minor\":0,\"op\":\"Write\",\"value\":0},{\"major\":179,\"minor\":0,\"op\":\"Sync\",\"value\":0},{\"major\":179,\"minor\":0,\"op\":\"Async\",\"value\":14},{\"major\":179,\"minor\":0,\"op\":\"Total\",\"value\":14}],\"io_queue_recursive\":[],\"io_service_time_recursive\":[],\"io_wait_time_recursive\":[],\"io_merged_recursive\":[],\"io_time_recursive\":[],\"sectors_recursive\":[]},\"num_procs\":0,\"storage_stats\":{},\"cpu_stats\":{\"cpu_usage\":{\"total_usage\":1001417913,\"percpu_usage\":[218304638,357942516,203459071,221711688],\"usage_in_kernelmode\":880000000,\"usage_in_usermode\":70000000},\"system_cpu_usage\":109994150000000,\"throttling_data\":{\"periods\":0,\"throttled_periods\":0,\"throttled_time\":0}},\"precpu_stats\":{\"cpu_usage\":{\"total_usage\":1001417913,\"percpu_usage\":[218304638,357942516,203459071,221711688],\"usage_in_kernelmode\":880000000,\"usage_in_usermode\":70000000},\"system_cpu_usage\":109990160000000,\"throttling_data\":{\"periods\":0,\"throttled_periods\":0,\"throttled_time\":0}},\"memory_stats\":{\"usage\":897024,\"max_usage\":1392640,\"stats\":{\"active_anon\":61440,\"active_file\":552960,\"cache\":835584,\"dirty\":0,\"hierarchical_memory_limit\":8796093018112,\"inactive_anon\":0,\"inactive_file\":282624,\"mapped_file\":622592,\"pgfault\":24963,\"pgmajfault\":6,\"pgpgin\":9980,\"pgpgout\":9761,\"rss\":61440,\"rss_huge\":0,\"total_active_anon\":61440,\"total_active_file\":552960,\"total_cache\":835584,\"total_dirty\":0,\"total_inactive_anon\":0,\"total_inactive_file\":282624,\"total_mapped_file\":622592,\"total_pgfault\":24963,\"total_pgmajfault\":6,\"total_pgpgin\":9980,\"total_pgpgout\":9761,\"total_rss\":61440,\"total_rss_huge\":0,\"total_unevictable\":0,\"total_writeback\":0,\"unevictable\":0,\"writeback\":0},\"limit\":970485760},\"name\":\"/test1.11.nzlw2p3bhyh9seva8xuh15s7l\",\"id\":\"4a8b63571f313c245dad5fc189421d0472136e7ed90af276c71a06ca56084b33\",\"networks\":{\"eth0\":{\"rx_bytes\":99510,\"rx_packets\":333,\"rx_errors\":0,\"rx_dropped\":5,\"tx_bytes\":2940,\"tx_packets\":20,\"tx_errors\":0,\"tx_dropped\":0}}}]"

	stats := json4go.Parse2JsonArray(body)
	fmt.Println(stats)
	statsNum := stats.GetLength()

	return nil
}

<nil>
panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x0 pc=0x40111c]

goroutine 1 [running]:
panic(0x5f6100, 0xc42000c130)
	/usr/local/go/src/runtime/panic.go:500 +0x1a1
main.calcNodeScoreTest(0x635714, 0xc, 0x0, 0xc42000d080)
	/home/test/Workspace/go/test.go:131 +0x8c
main.main()
	/home/test/Workspace/go/test.go:27 +0x36
exit status 2