cab689706f
For the Endpoint badge: #2473. `request-handler.js` is such a bear. I’m looking forward to being able to rewrite it when the service refactor is done.
56 lines
1.9 KiB
JavaScript
56 lines
1.9 KiB
JavaScript
'use strict'
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const makeBadge = require('../gh-badges/lib/make-badge')
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const { makeSend } = require('../lib/result-sender')
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const BaseService = require('./base')
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const { setCacheHeaders } = require('./cache-headers')
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// Badges are subject to two independent types of caching: in-memory and
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// downstream.
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//
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// Services deriving from `NonMemoryCachingBaseService` are not cached in
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// memory on the server. This means that each request that hits the server
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// triggers another call to the handler. When using badges for server
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// diagnostics, that's useful!
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//
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// In contrast, The `handle()` function of most other `BaseService`
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// subclasses is wrapped in onboard, in-memory caching. See `lib /request-
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// handler.js` and `BaseService.prototype.register()`.
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//
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// All services, including those extending NonMemoryCachingBaseServices, may
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// be cached _downstream_. This is governed by cache headers, which are
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// configured by the service, the user's request, and the server's default
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// cache length.
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module.exports = class NonMemoryCachingBaseService extends BaseService {
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static register({ camp }, serviceConfig) {
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const { cacheHeaders: cacheHeaderConfig } = serviceConfig
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const { _cacheLength: serviceDefaultCacheLengthSeconds } = this
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camp.route(this._regex, async (queryParams, match, end, ask) => {
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const namedParams = this._namedParamsForMatch(match)
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const serviceData = await this.invoke(
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{},
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serviceConfig,
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namedParams,
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queryParams
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)
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const badgeData = this._makeBadgeData(queryParams, serviceData)
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// The final capture group is the extension.
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const format = match.slice(-1)[0]
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badgeData.format = format
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const svg = makeBadge(badgeData)
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setCacheHeaders({
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cacheHeaderConfig,
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serviceDefaultCacheLengthSeconds,
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queryParams,
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res: ask.res,
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})
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makeSend(format, ask.res, end)(svg)
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})
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}
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}
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