@interopio/gateway/dist/metrics/publisher/rest.cjs.map

[](https://www.npmjs.com/package/@interopio/gateway)

{
  "version": 3,
  "sources": ["../../../src/metrics/publisher/rest.ts"],
  "sourcesContent": ["import type { PublishCommand } from './types.ts';\nimport { Metrics } from '../../../types/metrics/api';\nimport type { Logger } from '../../../types/logging/api';\nimport type { RestPublisherConfig } from '../../../types/metrics/publisher/rest';\n\nasync function discardResponseBody(response: Response) {\n    if (!response.bodyUsed) {\n        await response.blob();\n    }\n}\n\nconst SUCCESS_STATUSES = new Set<number>([200/*OK*/, 201/*CREATED*/, 202/*ACCEPTED*/]);\n\nfunction basicAuthCredentials({user, password}: { user: string; password: string }) {\n    const data = `${user}:${password}`;\n    if (typeof process !== 'undefined') {\n        return Buffer.from(data).toString('base64');\n    } else {\n        return globalThis.btoa(data);\n    }\n}\n\nexport const name = 'rest';\n\nasync function login(url: URL, {logger, fetch: fetchFn, headers, timeout}: HandleContext) {\n\n    if (logger.enabledFor('debug')) {\n        logger.debug(`sending initial GET to do auth dance. url: ${url}`);\n    }\n    try {\n        const response = await fetchFn(url, initRequest(timeout, headers));\n        if (response.ok) {\n            logger.info(`initial GET request completed successfully.`);\n            if (logger.enabledFor('debug')) {\n                const setCookie = response.headers.getSetCookie();\n                if (setCookie.length > 0) {\n                    if (logger.enabledFor('debug')) {\n                        logger.debug(`will set following cookies: ${setCookie}`);\n                    }\n                }\n            }\n        } else {\n            logger.warn(`initial GET request did not completed successfully. Status: ${response.status}`);\n        }\n    } catch (e) {\n        logger.warn(`error executing initial GET request`, e);\n        throw e;\n    }\n}\n\nasync function handleStart(auth: RestPublisherConfig['authentication'], context: HandleContext) {\n    if (!isBasicAuthorization(auth) && auth !== false) {\n        const url = new context.URL(context.endpoint);\n        if (auth?.path) {\n            url.pathname = auth.path;\n        }\n        await login(url, context)\n    }\n    context.logger.info('rest publisher started');\n}\n\nfunction handleStop({logger}: HandleContext) {\n    logger.info('rest publisher stopped');\n}\n\nfunction initRequest(timeout: number, headers: Headers, m?: Metrics.Update): RequestInit {\n    return m ?\n        {\n            method: 'POST',\n            redirect: 'manual',\n            credentials: 'include',\n            signal: AbortSignal.timeout(timeout),\n            headers,\n            body: JSON.stringify(m)\n        }\n        :\n        {\n            method: 'GET',\n            redirect: 'follow',\n            credentials: 'include',\n            signal: AbortSignal.timeout(timeout),\n            headers\n        }\n}\n\n// a helper type to track state changes\n// good -> bad\n// bad -> good\ntype PublisherState = {\n    // indicates if the previous state was healthy\n    prev: boolean\n    // indicates\n    now: boolean\n};\n\nasync function handleUpdate(m: Metrics.Update, state: PublisherState, {\n    endpoint,\n    headers,\n    timeout,\n    fetch: fetchFn,\n    logger\n}: HandleContext) {\n    const request = initRequest(timeout, headers, m);\n\n    try {\n        let response = await fetchFn(endpoint, request);\n        if (response.redirected) {\n            logger.info(`Redirect detected will do GET to allow auth dance and re-POST`);\n            await discardResponseBody(response);\n            const getResponse = await fetchFn(endpoint, initRequest(timeout, headers));\n            await discardResponseBody(getResponse);\n            if (getResponse.ok) {\n                response = await fetchFn(endpoint, request);\n            } else {\n                logger.error(`GET failed with status: ${getResponse.status} headers: ${JSON.stringify(getResponse.headers)}`);\n            }\n        }\n        await discardResponseBody(response);\n        state.prev = state.now;\n        state.now = SUCCESS_STATUSES.has(response.status);\n        if (state.prev && !state.now) {\n            logger.error(`Unable to publish metrics. status ${response.status} headers: ${JSON.stringify(response.headers)} msg: ${JSON.stringify(m)}`);\n        } else if (state.now && !state.prev) {\n            logger.info(`Publishing metrics.`);\n        }\n    } catch (e) {\n        const logError = state.now;\n        state.prev = state.now;\n        state.now = false;\n        if (logError) {\n            logger.error(`Unable to publish metrics. msg ${JSON.stringify(m)}`, e);\n        }\n    }\n}\n\ntype HandleContext = {\n    endpoint: string | URL\n    headers: Headers\n    timeout: number\n    fetch: typeof fetch\n    URL: typeof URL\n    logger: Logger\n}\n\nfunction isBasicAuthorization(auth?: RestPublisherConfig['authentication']): auth is {user: string, password: string} {\n    return auth !== undefined && auth && (auth['user'] !== undefined);\n}\n\nexport async function create(cfg: RestPublisherConfig, logger: Logger) {\n    const endpoint = cfg.endpoint;\n    const timeout = cfg.timeout ?? 1000;\n    const HeadersCtor: typeof Headers = cfg.Headers ?? globalThis.Headers ?? Headers;\n    const headers = new HeadersCtor(cfg.headers);\n    if (!headers.has('Content-Type')) {\n        headers.set('Content-Type', 'application/json');\n    }\n    if (!headers.has('User-Agent')) {\n        headers.set('User-Agent', cfg['user-agent'] ?? 'metrics-rest/0.2.x');\n    }\n    if (isBasicAuthorization(cfg.authentication) && !headers.has('Authorization')) {\n        headers.set('Authorization', `Basic ${basicAuthCredentials(cfg.authentication)}`);\n    }\n\n    const fetchFn: typeof fetch = cfg.fetch ?? globalThis.fetch ?? fetch;\n    const URLCtor: typeof URL = cfg.URL ?? globalThis.URL ?? URL;\n    const state = { prev: false, now: true };\n    const context: HandleContext = {endpoint, headers, timeout, fetch: fetchFn, URL: URLCtor, logger};\n    return async (m: PublishCommand) => {\n        if (logger.enabledFor('debug')) {\n            logger.debug(`handling publish request: ${JSON.stringify(m)}`);\n        }\n        switch (m) {\n            case 'start': {\n                await handleStart(cfg.authentication, context);\n                break;\n            }\n            case 'stop': {\n                handleStop(context);\n                break;\n            }\n            default: {\n                await handleUpdate(m, state, context);\n                break;\n            }\n        }\n    }\n}\n"],
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  "names": ["rest_exports", "__export", "create", "name", "__toCommonJS", "discardResponseBody", "response", "SUCCESS_STATUSES", "basicAuthCredentials", "user", "password", "data", "login", "url", "logger", "fetchFn", "headers", "timeout", "initRequest", "setCookie", "e", "handleStart", "auth", "context", "isBasicAuthorization", "handleStop", "m", "handleUpdate", "state", "endpoint", "request", "getResponse", "logError", "cfg", "HeadersCtor", "URLCtor"]
}