導(dǎo)語(yǔ)
在時(shí)序分析及監(jiān)控展示領(lǐng)域清寇，Grafana無(wú)疑是開(kāi)源解決方案中的翹楚浩村，其靈活的插件機(jī)制做葵，支持各種漂亮的面板、豐富的數(shù)據(jù)源以及強(qiáng)大的應(yīng)用心墅。典型的面板有Graph酿矢、Text、Singlestat怎燥、PieChart瘫筐、Table、Histogram等铐姚，支持的數(shù)據(jù)源有ES策肝、Graphite、InfluxDB隐绵、OpenTSDB之众、MySQL、Druid 依许、Prometheus棺禾、SimpleJson等，提供的應(yīng)用有Zabbix峭跳、K8s等膘婶。但是某公司在分布式集群中物理機(jī)監(jiān)控的數(shù)據(jù)源為gRPC方式，即連接gRPC即可獲取實(shí)時(shí)物理機(jī)監(jiān)控信息坦康，如CPU竣付，內(nèi)存，磁盤(pán)滞欠，負(fù)載等信息古胆，這樣就能使用后臺(tái)轉(zhuǎn)發(fā)gRPC的消息，這里使用SSM框架的java后臺(tái)為grafana提供的SimpleJson數(shù)據(jù)源筛璧。
作者撰文時(shí)逸绎，網(wǎng)上幾乎沒(méi)有分享SimpleJson數(shù)據(jù)源的java后臺(tái)API，為此分享給大家夭谤，初次分享棺牧，不便之處請(qǐng)見(jiàn)諒。
整體架構(gòu)如下所示:
一朗儒、WebAPI
如果要支持SimpleJson颊乘，后端WebAPI需要實(shí)現(xiàn)4個(gè)URL：
/：返回200参淹，用于SimpleJson數(shù)據(jù)源測(cè)試連通性；
/search：返回所有可選的指標(biāo)乏悄；
/query：返回對(duì)應(yīng)指標(biāo)的時(shí)間序列點(diǎn)浙值；
/annotations：返回注解。
@RequestMapping(value = "/", method = RequestMethod.GET)
@ResponseBody
public Map ReturnTest(HttpServletResponse response){
response.setHeader("Access-Control-Allow-Headers", "accept, content-type");
response.setHeader("Access-Control-Allow-Methods", "POST");
response.setHeader("Access-Control-Allow-Origin", "*");
Map<String, Object> map = new HashMap<String, Object>();
map.put("result", "200 ok");
return map;
}
@RequestMapping(value = "/search", method = RequestMethod.POST)
@ResponseBody
public List Search(HttpServletResponse response) {
response.setHeader("Access-Control-Allow-Headers", "accept, content-type");
response.setHeader("Access-Control-Allow-Methods", "POST");
response.setHeader("Access-Control-Allow-Origin", "*");
List<String> result = new ArrayList<String>();
result.add("CPU");
result.add("RAM");
result.add("LOAD");
result.add("SWAP");
result.add("DISK");
result.add("NET");
return result;
}
``
```java
@RequestMapping(value = "/query", method = RequestMethod.POST)
@ResponseBody
public List Query(@RequestBody Map<String,Object> params, HttpServletResponse response) {
List<Map> targetList = (List) params.get("targets");
List<Map<String, Object>> result = new ArrayList<Map<String, Object>>() ;
for (Map targetMap : targetList){
String target = (String)targetMap.get("target");
Map scopedVars = (Map) params.get("scopedVars");
Map IP = (Map) scopedVars.get("IP");
String nodeIP = (String) IP.get("text");
if (target.equals("CPU")){
result.add(nodeMonitorService.getCpuMap(nodeIP));
}else if (target.equals("RAM")){
result.add(nodeMonitorService.getRamMap(nodeIP));
}else if (target.equals("LOAD")) {
result.add(nodeMonitorService.getLoadMap(nodeIP));
}else if (target.equals("SWAP")){
result.add(nodeMonitorService.getSwapMap(nodeIP));
}else if(target.equals("DISK")){
result = nodeMonitorService.getDiskList(nodeIP);
}else if (target.equals("NET")){
result = nodeMonitorService.getNetList(nodeIP);
}
}
response.setHeader("Access-Control-Allow-Headers", "accept, content-type");
response.setHeader("Access-Control-Allow-Methods", "POST");
response.setHeader("Access-Control-Allow-Origin", "*");
Collections.sort(result, new Comparator<Map<String, Object>>() {
public int compare(Map<String, Object> o1, Map<String, Object> o2) {
String name1 = String.valueOf(o1.get("target").toString()) ;
String name2 = String.valueOf(o2.get("target").toString()) ;
return name1.compareTo(name2);
}
});
return result;
}
@RequestMapping(value = "/annotations", method = RequestMethod.POST)
@ResponseBody
public Map Annotations() {
Map<String, Object> map = new HashMap<String, Object>();
map.put("result", "200 ok");
return map;
}
注意header里面加上這3條：
response.setHeader("Access-Control-Allow-Headers", "accept, content-type");
response.setHeader("Access-Control-Allow-Methods", "POST");
response.setHeader("Access-Control-Allow-Origin", "*");
二檩小、grafana配置
安裝grafana开呐，安裝SimpleJson插件，在grafana官網(wǎng)规求，有詳細(xì)說(shuō)明筐付。
啟動(dòng)訪問(wèn)，使用admin賬戶(hù)登錄阻肿，
1瓦戚、創(chuàng)建數(shù)據(jù)源：DataSources
type選擇SimpleJson類(lèi)型，URL填入后臺(tái)服務(wù)的API地址冕茅，
2伤极、創(chuàng)建面板dashboard
這個(gè)面板我已經(jīng)分享到grafana網(wǎng)站了，可以前去下載：https://grafana.com/dashboards/5075
綜上所述姨伤，基于SimpleJson數(shù)據(jù)源哨坪，只要配置數(shù)據(jù)源之后，按正確的方式添加API即可將數(shù)據(jù)靈活展現(xiàn)在Grafana中乍楚，當(dāng)然SimpleJson只是一個(gè)數(shù)據(jù)源協(xié)議載體当编，理論上可以對(duì)接任何類(lèi)型的后臺(tái)數(shù)據(jù)，只要組裝成它支持的格式即可徒溪。
