quilling.dev
An ATproto social media client -- with an independent Appview.
add metrics middleware to ogcard service
+3
bskyogcard/package.json
+3
bskyogcard/package.json
···
14
"@atproto/common": "^0.4.0",
15
"@resvg/resvg-js": "^2.6.2",
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"express": "^4.19.2",
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"http-terminator": "^3.2.0",
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"pino": "^9.2.0",
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"react": "^18.3.1",
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"satori": "^0.10.13",
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"twemoji": "^14.0.2"
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},
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"devDependencies": {
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"@types/node": "^20.14.3",
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"ts-node": "^10.9.2",
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"typescript": "^5.4.5"
···
14
"@atproto/common": "^0.4.0",
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"@resvg/resvg-js": "^2.6.2",
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"express": "^4.19.2",
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+
"express-prom-bundle": "^7.0.0",
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"http-terminator": "^3.2.0",
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"pino": "^9.2.0",
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+
"prom-client": "^15.1.3",
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"react": "^18.3.1",
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"satori": "^0.10.13",
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"twemoji": "^14.0.2"
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},
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"devDependencies": {
26
+
"@types/express": "^4.17.21",
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"@types/node": "^20.14.3",
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"ts-node": "^10.9.2",
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"typescript": "^5.4.5"
+4
bskyogcard/src/config.ts
+4
bskyogcard/src/config.ts
···
6
7
export type ServiceConfig = {
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port: number
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version?: string
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appviewUrl: string
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originVerify?: string
···
13
14
export type Environment = {
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port?: number
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version?: string
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appviewUrl?: string
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originVerify?: string
···
21
export const readEnv = (): Environment => {
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return {
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port: envInt('CARD_PORT'),
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version: envStr('CARD_VERSION'),
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appviewUrl: envStr('CARD_APPVIEW_URL'),
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originVerify: envStr('CARD_ORIGIN_VERIFY'),
···
30
export const envToCfg = (env: Environment): Config => {
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const serviceCfg: ServiceConfig = {
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port: env.port ?? 3000,
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version: env.version,
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appviewUrl: env.appviewUrl ?? 'https://api.bsky.app',
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originVerify: env.originVerify,
···
6
7
export type ServiceConfig = {
8
port: number
9
+
metricsPort: number
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version?: string
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appviewUrl: string
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originVerify?: string
···
14
15
export type Environment = {
16
port?: number
17
+
metricsPort?: number
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version?: string
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appviewUrl?: string
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originVerify?: string
···
23
export const readEnv = (): Environment => {
24
return {
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port: envInt('CARD_PORT'),
26
+
metricsPort: envInt('CARD_METRICS_PORT'),
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version: envStr('CARD_VERSION'),
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appviewUrl: envStr('CARD_APPVIEW_URL'),
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originVerify: envStr('CARD_ORIGIN_VERIFY'),
···
33
export const envToCfg = (env: Environment): Config => {
34
const serviceCfg: ServiceConfig = {
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port: env.port ?? 3000,
36
+
metricsPort: env.metricsPort ?? 3001,
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version: env.version,
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appviewUrl: env.appviewUrl ?? 'https://api.bsky.app',
39
originVerify: env.originVerify,
+34
bskyogcard/src/index.ts
+34
bskyogcard/src/index.ts
···
2
import type http from 'node:http'
3
4
import express from 'express'
5
import {createHttpTerminator, type HttpTerminator} from 'http-terminator'
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7
import {type Config} from './config.js'
8
import {AppContext} from './context.js'
···
13
14
export class CardService {
15
public server?: http.Server
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private terminator?: HttpTerminator
17
18
constructor(
19
public app: express.Application,
···
24
let app = express()
25
26
const ctx = await AppContext.fromConfig(cfg)
27
app = routes(ctx, app)
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app.use(errorHandler)
29
···
31
}
32
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async start() {
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this.server = this.app.listen(this.ctx.cfg.service.port)
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this.server.keepAliveTimeout = 90000
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this.terminator = createHttpTerminator({server: this.server})
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await events.once(this.server, 'listening')
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}
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async destroy() {
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this.ctx.abortController.abort()
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await this.terminator?.terminate()
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}
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}
···
2
import type http from 'node:http'
3
4
import express from 'express'
5
+
import promBundle from 'express-prom-bundle'
6
import {createHttpTerminator, type HttpTerminator} from 'http-terminator'
7
+
import {register} from 'prom-client'
8
9
import {type Config} from './config.js'
10
import {AppContext} from './context.js'
···
15
16
export class CardService {
17
public server?: http.Server
18
+
public metricsServer?: http.Server
19
private terminator?: HttpTerminator
20
+
private metricsTerminator?: HttpTerminator
21
22
constructor(
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public app: express.Application,
···
28
let app = express()
29
30
const ctx = await AppContext.fromConfig(cfg)
31
+
32
+
// Add Prometheus middleware for automatic HTTP instrumentation
33
+
const metricsMiddleware = promBundle({
34
+
includeMethod: true,
35
+
includePath: true,
36
+
includeStatusCode: true,
37
+
includeUp: true,
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+
promClient: {
39
+
collectDefaultMetrics: {
40
+
timeout: 5000,
41
+
},
42
+
},
43
+
// Don't expose /metrics on main app - we'll use separate server
44
+
autoregister: false,
45
+
})
46
+
app.use(metricsMiddleware)
47
+
48
app = routes(ctx, app)
49
app.use(errorHandler)
50
···
52
}
53
54
async start() {
55
+
// Start main application server
56
this.server = this.app.listen(this.ctx.cfg.service.port)
57
this.server.keepAliveTimeout = 90000
58
this.terminator = createHttpTerminator({server: this.server})
59
await events.once(this.server, 'listening')
60
+
61
+
// Start separate metrics server
62
+
const metricsApp = express()
63
+
metricsApp.get('/metrics', (_req, res) => {
64
+
res.set('Content-Type', register.contentType)
65
+
res.end(register.metrics())
66
+
})
67
+
68
+
this.metricsServer = metricsApp.listen(this.ctx.cfg.service.metricsPort)
69
+
this.metricsTerminator = createHttpTerminator({server: this.metricsServer})
70
+
await events.once(this.metricsServer, 'listening')
71
}
72
73
async destroy() {
74
this.ctx.abortController.abort()
75
await this.terminator?.terminate()
76
+
await this.metricsTerminator?.terminate()
77
}
78
}