如何用 Lua 查詢青雲的主機

首先安裝內置青雲SDK的 qlua 命令: go get github.com/chai2010/qingcloud-go/cmd/qlua

注：這個解釋器不是官方的C語言版本Lua解釋器，而且純Go語言實現的 GopherLua 解釋器訂製而來。

創建一個JSON格式的配置文件，裏面含有基本是口令信息 ~/.qingcloud/qcli.json:

{
	"api_server": "https://api.qingcloud.com/iaas/",
	"access_key_id": "公鑰",
	"secret_access_key": "私鑰",
	"zone": "pek3a"
}

然後創建 hello.lua 腳本:

local qc = require("qingcloud.iaas")

if #arg == 1 and arg[1] == '-v' then
	print(qc.version)
	print(qc.version_info.git_sha1_version)
	print(qc.version_info.build_date)
	do return end
end

if #arg == 1 and arg[1] == '-h' then
	print(qc.copyright)
	print("hello, 青雲!")
	do return end
end

local config = qc.LoadJSON("~/.qingcloud/qcli.json")
local client = qc.Client:new(config)

local reply, err = client:DescribeInstances {
	--owner = "usr-xxxxxxxx",
	zone = "pek3a",
	limit = 100
}
if err ~= nil then
	print("error:", err)
	do return end
end

if reply.ret_code ~= 0 then
	print(reply.ret_code)
	print(reply.message)
	do return end
end

for i = 1, #reply.instance_set do
	local item = reply.instance_set[i]
	print(i,
		item.instance_id,
		item.instance_type,
		item.memory_current..'MB',
		item.status,
		item.create_time,
		item.instance_name
	)
end

print('total: ' .. reply.total_count)

可以輸入一下命令執行:

$ qlua hello.lua -h
$ qlua hello.lua -v
$ qlua hello.lua

如果虛機數量巨大，則需要多次調用 client:DescribeInstances 獲取。

參考:

https://github.com/chai2010/qingcloud-go#qucik-guide-gopherlua-version