|
| 1 | +const { Transform } = require('stream') |
| 2 | +const log = require('./logger') |
| 3 | +const { EventEmitter } = require('events') |
| 4 | + |
| 5 | +class BodyStream extends Transform { |
| 6 | + _transform (chunk, encoding, callback) { |
| 7 | + callback(null, chunk) |
| 8 | + } |
| 9 | + |
| 10 | + once (event, listerer) { |
| 11 | + const self = this |
| 12 | + const _listener = (e) => { |
| 13 | + listerer(e) |
| 14 | + self.removeListener(event, _listener) |
| 15 | + } |
| 16 | + this.on(event, _listener) |
| 17 | + } |
| 18 | +} |
| 19 | + |
| 20 | +const wrapper = (handler, parsers) => { |
| 21 | + /** |
| 22 | + * @param ctx {Request} |
| 23 | + */ |
| 24 | + const res = async (ctx, server) => { |
| 25 | + let response = '' |
| 26 | + let status = 200 |
| 27 | + let reqBody = '' |
| 28 | + let headers = {} |
| 29 | + |
| 30 | + const stream = new BodyStream() |
| 31 | + setTimeout(async () => { |
| 32 | + if (!ctx.body) { |
| 33 | + stream.end() |
| 34 | + return |
| 35 | + } |
| 36 | + for await (const chunk of ctx.body) { |
| 37 | + stream.write(chunk) |
| 38 | + } |
| 39 | + stream.end() |
| 40 | + }) |
| 41 | + const req = { |
| 42 | + headers: Object.fromEntries(ctx.headers.entries()), |
| 43 | + raw: stream, |
| 44 | + log: log, |
| 45 | + params: ctx.params || {}, |
| 46 | + query: {} |
| 47 | + } |
| 48 | + for (const [key, value] of (new URL(ctx.url)).searchParams) { |
| 49 | + if (!(key in req.query)) { |
| 50 | + req.query[key] = value |
| 51 | + continue |
| 52 | + } |
| 53 | + req.query[key] = Array.isArray(req.query[key]) |
| 54 | + ? [...req.query[key], value] |
| 55 | + : [req.query[key], value] |
| 56 | + } |
| 57 | + const res = { |
| 58 | + send: (msg) => { |
| 59 | + response = msg |
| 60 | + }, |
| 61 | + code: (code) => { |
| 62 | + status = code |
| 63 | + return res |
| 64 | + }, |
| 65 | + header: (key, value) => { |
| 66 | + headers[key] = value |
| 67 | + return res |
| 68 | + }, |
| 69 | + headers: (hdrs) => { |
| 70 | + headers = { ...headers, ...hdrs } |
| 71 | + return res |
| 72 | + } |
| 73 | + } |
| 74 | + |
| 75 | + if (parsers) { |
| 76 | + const contentType = (ctx.headers.get('Content-Type') || '') |
| 77 | + let ok = false |
| 78 | + for (const [type, parser] of Object.entries(parsers)) { |
| 79 | + if (type !== '*' && contentType.indexOf(type) > -1) { |
| 80 | + log.debug(`parsing ${type}`) |
| 81 | + reqBody = await parser(req, stream) |
| 82 | + ok = true |
| 83 | + log.debug(`parsing ${type} ok`) |
| 84 | + } |
| 85 | + } |
| 86 | + if (!ok && parsers['*']) { |
| 87 | + log.debug('parsing *') |
| 88 | + reqBody = await parsers['*'](req, stream) |
| 89 | + ok = true |
| 90 | + log.debug('parsing * ok') |
| 91 | + } |
| 92 | + if (!ok) { |
| 93 | + throw new Error('undefined content type ' + contentType) |
| 94 | + } |
| 95 | + } |
| 96 | + |
| 97 | + req.body = reqBody || stream |
| 98 | + |
| 99 | + let result = handler(req, res) |
| 100 | + if (result && result.then) { |
| 101 | + result = await result |
| 102 | + } |
| 103 | + if (result && result.on) { |
| 104 | + response = '' |
| 105 | + result.on('data', (d) => { |
| 106 | + response += d |
| 107 | + }) |
| 108 | + await new Promise((resolve, reject) => { |
| 109 | + result.on('end', resolve) |
| 110 | + result.on('error', reject) |
| 111 | + result.on('close', resolve) |
| 112 | + }) |
| 113 | + result = null |
| 114 | + } |
| 115 | + if (result) { |
| 116 | + response = result |
| 117 | + } |
| 118 | + if (response instanceof Object && typeof response !== 'string') { |
| 119 | + response = JSON.stringify(response) |
| 120 | + } |
| 121 | + return new Response(response, { status: status, headers: headers }) |
| 122 | + } |
| 123 | + return res |
| 124 | +} |
| 125 | + |
| 126 | +const wsWrapper = (handler) => { |
| 127 | + /** |
| 128 | + * @param ctx {Request} |
| 129 | + */ |
| 130 | + const res = { |
| 131 | + open: async (ctx, server) => { |
| 132 | + const req = { |
| 133 | + headers: Object.fromEntries(ctx.data.ctx.headers.entries()), |
| 134 | + log: log, |
| 135 | + query: {} |
| 136 | + } |
| 137 | + for (const [key, value] of (new URL(ctx.data.ctx.url)).searchParams) { |
| 138 | + if (!(key in req.query)) { |
| 139 | + req.query[key] = value |
| 140 | + continue |
| 141 | + } |
| 142 | + req.query[key] = Array.isArray(req.query[key]) |
| 143 | + ? [...req.query[key], value] |
| 144 | + : [req.query[key], value] |
| 145 | + } |
| 146 | + |
| 147 | + ctx.closeEmitter = new EventEmitter() |
| 148 | + ctx.closeEmitter.send = ctx.send.bind(ctx) |
| 149 | + |
| 150 | + const ws = { |
| 151 | + socket: ctx.closeEmitter |
| 152 | + } |
| 153 | + |
| 154 | + const result = handler(ws, { query: req.query }) |
| 155 | + if (result && result.then) { |
| 156 | + await result |
| 157 | + } |
| 158 | + }, |
| 159 | + close: (ctx) => { ctx.closeEmitter.emit('close') } |
| 160 | + } |
| 161 | + return res |
| 162 | +} |
| 163 | + |
| 164 | +module.exports = { |
| 165 | + wrapper, |
| 166 | + wsWrapper |
| 167 | +} |
0 commit comments