go json库gjson

gjson

1. 直接使用json库，需要自己构建结构体。

2. gjson可以直接解析json字符串，不用unmar..成结构体。

3. 包路径：github.com/tidwall/gjson

一些使用

1. 通过key获得对象

	bns := gjson.Get(jsonData, "Bns")

2. 遍历数组

	temp:=gjson.Parse(jsonData)
	temp.ForEach(func(key, value gjson.Result) bool {
		localIpPort := gjson.Get(value.String(), "LocalIpPort")
		remoteIpPort := gjson.Get(value.String(), "RemoteIpPort")
		cwd := gjson.Get(value.String(), "Cwd")
		bns := gjson.Get(value.String(), "Bns")
		direction := gjson.Get(value.String(), "Direction")

		return true
	})

一个例子

json格式

	{"enable":["hbb"],"idc_mapping_rule":{"hba":{"prefer":["hba"],"backup":["hbb"],"min_instance_need":1},"hbb":{"prefer":["hbb"],"backup":["hba"],"min_instance_need":1},"hbf":{"prefer":["hbf"],"backup":["hba"],"min_instance_need":1},"hbg":{"prefer":["hbg"],"backup":["hbb"],"min_instance_need":1},"default":{"prefer":["hba","hbb"]}}}

主要解析代码

// 规则1：enable不为1
		enable := gjson.Get(temp.String(), "enable")
		if !enable.Exists() || enable.String() != "1" {
			fdWriter.WriteString(line + "\n")
		}

		idc_mapping_rule := gjson.Get(temp.String(), "idc_mapping_rule")
		idc_mapping_rule.ForEach(func(key, value gjson.Result) bool {
			if key.String() == "default" {
				return true
			}
			// 规则2：prefer backup min 不全，必须三个都有
			prefer := gjson.Get(value.String(), "prefer")
			backup := gjson.Get(value.String(), "backup")
			min_instance_need := gjson.Get(value.String(), "min_instance_need")
			if !prefer.Exists() || !backup.Exists() || !min_instance_need.Exists() {
				fdWriter.WriteString(line + "\n")
				return true
			}

			// 规则3: hbg->hba hbf->hbb //TODO 这里的backup是列表
			if key.String() == "hbf" && backup.String() != "[\"hbb\"]" {
				fdWriter.WriteString(line + "\n")
				return true
			}
			if key.String() == "hbg" && backup.String() != "[\"hba\"]" {
				fdWriter.WriteString(line + "\n")
				return true
			}
			return true
		})