150 lines
4.0 KiB
JavaScript
150 lines
4.0 KiB
JavaScript
/**
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* 统一请求封装：自动拼接 baseURL、携带 token、处理 401
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* 使用前需已执行 App()，否则 getApp() 在 require 时可能未就绪，这里在请求时再取 app
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*/
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function getAppSafe() {
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try {
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return getApp()
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} catch (e) {
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return null
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}
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}
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function getToken() {
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const app = getAppSafe()
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return (app && app.globalData && app.globalData.token) || wx.getStorageSync('token') || ''
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}
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function getApiBase() {
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const app = getAppSafe()
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return (app && app.globalData && app.globalData.apiBase) || ''
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}
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/**
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* 清除登录态（401 或主动退出时调用）
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*/
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function clearLoginState() {
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const app = getAppSafe()
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if (app && app.globalData) {
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app.globalData.token = null
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app.globalData.userInfo = null
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app.globalData.openId = null
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}
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try {
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wx.removeStorageSync('token')
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wx.removeStorageSync('userInfo')
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} catch (e) {}
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}
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/**
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* 发起请求
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* @param {Object} options - 同 wx.request，url 可为相对路径（自动加 apiBase）
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* @param {boolean} options.needAuth - 是否携带 Authorization，默认 true
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* @param {boolean} options.allow401 - 401 时是否静默清除登录态而不 fail，默认 true
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*/
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function request(options) {
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const apiBase = getApiBase()
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const url = options.url
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const fullUrl = url.startsWith('http') ? url : `${apiBase.replace(/\/$/, '')}${url.startsWith('/') ? '' : '/'}${url}`
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const needAuth = options.needAuth !== false
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const allow401 = options.allow401 !== false
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const header = {
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'Content-Type': 'application/json',
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...(options.header || {})
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}
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if (needAuth) {
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const token = getToken()
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if (token) header['Authorization'] = `Bearer ${token}`
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}
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const success = options.success
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const fail = options.fail
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const complete = options.complete
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return wx.request({
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...options,
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url: fullUrl,
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header,
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success(res) {
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if (res.statusCode === 401 && allow401) {
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clearLoginState()
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}
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if (success) success(res)
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},
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fail(err) {
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if (fail) fail(err)
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},
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complete(res) {
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if (complete) complete(res)
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}
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})
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}
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/**
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* Promise 版 request，便于 async/await
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*/
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function requestPromiseOnce(options) {
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return new Promise((resolve, reject) => {
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request({
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timeout: options.timeout || 15000,
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...options,
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success(res) {
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if (res.statusCode >= 200 && res.statusCode < 300) {
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resolve(res)
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} else {
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let msg = '请求失败'
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const d = res.data
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if (d && typeof d === 'object' && d.message) msg = d.message
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else if (typeof d === 'string') {
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try {
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const o = JSON.parse(d)
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if (o && o.message) msg = o.message
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} catch (e) {
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if (res.statusCode === 401) msg = '未登录或登录已过期'
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}
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}
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const err = new Error(msg)
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err.statusCode = res.statusCode
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reject(err)
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}
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},
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fail(err) {
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// wx.request fail：网络不可达 / CONNECTION_CLOSED / TLS / 超时
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const e = new Error((err && err.errMsg) || '网络异常')
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e.isNetworkError = true
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reject(e)
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}
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})
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})
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}
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/**
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* 带指数退避重试（默认 2 次）：仅对"网络异常"或 5xx 重试，4xx 不重试
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* 用法：requestPromise({ url, ...opts, retry: 2, retryDelayMs: 400 })
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*/
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function requestPromise(options) {
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const retry = options.retry == null ? 2 : Number(options.retry) || 0
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const retryDelayMs = options.retryDelayMs == null ? 400 : Number(options.retryDelayMs) || 0
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let attempt = 0
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const run = () => requestPromiseOnce(options).catch((err) => {
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const retriable = err && (err.isNetworkError || (err.statusCode >= 500 && err.statusCode < 600))
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if (!retriable || attempt >= retry) {
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return Promise.reject(err)
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}
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attempt += 1
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const wait = retryDelayMs * Math.pow(2, attempt - 1)
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return new Promise((r) => setTimeout(r, wait)).then(run)
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})
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return run()
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}
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module.exports = {
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request,
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requestPromise,
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requestPromiseOnce,
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getToken,
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getApiBase,
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clearLoginState
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}
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