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fix(prometheus): call Client.register.clear() before init #2892

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fix(prometheus): call Client.register.clear() before init #2892

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1 change: 1 addition & 0 deletions packages/prometheus/src/service/dataService.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -20,6 +20,7 @@ export class DataService {
bInit = false;

async init() {
Client.register.clear();
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调用这个的原因是？

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我单测里面会出现这种异常

 2023-04-11 15:39:52,166 ERROR 3250 Error [unhandledRejectionError]: A metric with the name http_request_latency_milliseconds has already been registered.
    at Registry.registerMetric (/__w/midway-components/midway-components/node_modules/prom-client/lib/registry.js:67:10)
    at new Metric (/__w/midway-components/midway-components/node_modules/prom-client/lib/metric.js:48:13)
    at new Summary (/__w/midway-components/midway-components/node_modules/prom-client/lib/summary.js:17:3)
    at DataService.init (/__w/midway-components/midway-components/node_modules/@midwayjs/prometheus/dist/service/dataService.js:23:32)
    at DataService.getUser (/__w/midway-components/midway-components/node_modules/@midwayjs/prometheus/dist/service/dataService.js:47:18)
    at /__w/midway-components/midway-components/node_modules/@midwayjs/prometheus/dist/configuration.js:77:25
    at process.processTicksAndRejections (node:internal/process/task_queues:95:5)
    at async /__w/midway-components/midway-components/node_modules/@midwayjs/i18n/dist/middleware.js:150:17
    at async handleAppExceptionAndNext (/__w/midway-components/midway-components/packages/otel/dist/middleware/helper.middleware.js:28:9)
    at async bodyParser (/__w/midway-components/midway-components/node_modules/koa-bodyparser/index.js:91:5)
2023-04-11 15:39:52,169 ERROR 3250 TypeError: Cannot read properties of undefined (reading 'labels')
    at DataService.getUser (/__w/midway-components/midway-components/node_modules/@midwayjs/prometheus/dist/service/dataService.js:51:14)
    at /__w/midway-components/midway-components/node_modules/@midwayjs/prometheus/dist/configuration.js:77:25
    at process.processTicksAndRejections (node:internal/process/task_queues:95:5)
    at async /__w/midway-components/midway-components/node_modules/@midwayjs/i18n/dist/middleware.js:150:17
    at async handleAppExceptionAndNext (/__w/midway-components/midway-components/packages/otel/dist/middleware/helper.middleware.js:28:9)
    at async bodyParser (/__w/midway-components/midway-components/node_modules/koa-bodyparser/index.js:91:5)
    at async session (/__w/midway-components/midway-components/node_modules/@midwayjs/session/dist/middleware/session.js:137:17)
    at async middleware (/__w/midway-components/midway-components/packages/boot/dist/middleware/error-handler.middleware.js:30:9)
    at async handleTopExceptionAndNext (/__w/midway-components/midway-components/packages/otel/dist/middleware/helper.middleware.js:12:9)
    at async middleware (/__w/midway-components/midway-components/packages/otel/dist/middleware/trace-outer.middleware.js:58:5)

导致后续频繁出现 undefined 异常：

2023-04-11 15:39:52,177 ERROR 3250 TypeError: Cannot read properties of undefined (reading 'labels')
    at DataService.getUser (/__w/midway-components/midway-components/node_modules/@midwayjs/prometheus/dist/service/dataService.js:51:14)
    at /__w/midway-components/midway-components/node_modules/@midwayjs/prometheus/dist/configuration.js:77:25
    at process.processTicksAndRejections (node:internal/process/task_queues:95:5)
    at async /__w/midway-components/midway-components/node_modules/@midwayjs/i18n/dist/middleware.js:150:17
    at async handleAppExceptionAndNext (/__w/midway-components/midway-components/packages/otel/dist/middleware/helper.middleware.js:28:9)
    at async bodyParser (/__w/midway-components/midway-components/node_modules/koa-bodyparser/index.js:91:5)
    at async session (/__w/midway-components/midway-components/node_modules/@midwayjs/session/dist/middleware/session.js:137:17)
    at async middleware (/__w/midway-components/midway-components/packages/boot/dist/middleware/error-handler.middleware.js:30:9)
    at async handleTopExceptionAndNext (/__w/midway-components/midway-components/packages/otel/dist/middleware/helper.middleware.js:12:9)
    at async middleware (/__w/midway-components/midway-components/packages/otel/dist/middleware/trace-outer.middleware.js:58:5)

搜索了下，问题似乎应该是 prom 重复注册导致的，解决办法是注册之前先清理一次。

this.responseSummary = new Client.Summary({
name: 'http_request_latency_milliseconds',
help: 'response time in millis',
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