go/wasm-http-server
go/wasm-http-server
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Nicolas Lepage 2021-01-21 23:13:57 +01:00
parent 9ffd514abc
commit 3c63741d6a
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1 changed files with 8 additions and 41 deletions
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49
sw.js
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@ -1,6 +1,6 @@
importScripts('https://cdn.jsdelivr.net/gh/golang/go@go1.15.7/misc/wasm/wasm_exec.js')
const startWasm = async (wasm, { env, args = [] }) => {
async function startWasm(wasm, { env, args = [] }) => {
const go = new Go()
go.env = env
go.argv = [wasm, ...args]
@ -8,13 +8,13 @@ const startWasm = async (wasm, { env, args = [] }) => {
return go.run(instance)
}
const trimStart = (s, c) => {
function trimStart(s, c) {
let r = s
while (r.startsWith(c)) r = r.slice(c.length)
return r
}
const trimEnd = (s, c) => {
function trimEnd(s, c) {
let r = s
while (r.endsWith(c)) r = r.slice(0, -c.length)
return r
@ -24,7 +24,6 @@ const trimEnd = (s, c) => {
// event.waitUntil(skipWaiting())
// })
const running = new Set()
let nextHandlerId = 1
const handlerResolvers = {}
const handlers = []
@ -36,55 +35,23 @@ self.wasmhttp = {
},
}
console.log('aha!')
addEventListener('activate', event => {
console.log('activate!')
event.waitUntil(clients.claim())
})
addEventListener('message', async ({ data }) => {
console.log('message!', data)
if (data.type !== 'wasmhttp.register') return
const { wasm, base, args } = data
let path = new URL(registration.scope).pathname
if (base && base !== '') path = `${trimEnd(path, '/')}/${trimStart(base, '/')}`
const key = `${wasm}:${path}`
if (!running.has(key)) {
const handlerId = `${nextHandlerId++}`
const handler = new Promise(resolve => handlerResolvers[handlerId] = resolve)
startWasm(wasm, { env: { WASMHTTP_HANDLER_ID: handlerId, WASMHTTP_PATH: path }, args })
running.add(key)
// FIXME try catch
handlers.push([path, await handler])
}
})
addEventListener('fetch', e => {
console.log('fetch')
const { pathname } = new URL(e.request.url)
const [, handler] = handlers.find(([path]) => pathname.startsWith(path)) || []
if (!handler) return
e.respondWith(handler(e.request))
})
function registerWasmHTTPListener(wasm, base, args) {
let path = new URL(registration.scope).pathname
if (base && base !== '') path = `${trimEnd(path, '/')}/${trimStart(base, '/')}`
addEventListener('fetch', async e => {
console.log("new fetch !")
const { pathname } = new URL(e.request.url)
if (!pathname.startsWith(path)) return
console.log("path OK!")
const handlerId = `${nextHandlerId++}`
const handlerPromise = new Promise(resolve => handlerResolvers[handlerId] = resolve)
@ -92,7 +59,7 @@ function registerWasmHTTPListener(wasm, base, args) {
startWasm(wasm, { env: { WASMHTTP_HANDLER_ID: handlerId, WASMHTTP_PATH: path }, args })
const handler = await handlerPromise
e.respondWith(handler(e.request))
})
}