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import type { NodejsRequestData, FetchEventResult, RequestData } from '../types'
import type { EdgeFunctionDefinition } from '../../../build/webpack/plugins/middleware-plugin'
import type { EdgeRuntime } from 'next/dist/compiled/edge-runtime'
import {
getModuleContext,
requestStore,
edgeSandboxNextRequestContext,
} from './context'
import { requestToBodyStream } from '../../body-streams'
import { NEXT_RSC_UNION_QUERY } from '../../../client/components/app-router-headers'
import type { ServerComponentsHmrCache } from '../../response-cache'
import {
getBuiltinRequestContext,
type BuiltinRequestContextValue,
} from '../../after/builtin-request-context'
import {
RouterServerContextSymbol,
routerServerGlobal,
} from '../../lib/router-utils/router-server-context'
export const ErrorSource = Symbol('SandboxError')
const FORBIDDEN_HEADERS = [
'content-length',
'content-encoding',
'transfer-encoding',
]
interface RunnerFnParams {
name: string
onError?: (err: unknown) => void
onWarning?: (warn: Error) => void
paths: string[]
request: NodejsRequestData
useCache: boolean
edgeFunctionEntry: Pick<EdgeFunctionDefinition, 'assets' | 'wasm' | 'env'>
distDir: string
incrementalCache?: any
serverComponentsHmrCache?: ServerComponentsHmrCache
}
type RunnerFn = (params: RunnerFnParams) => Promise<FetchEventResult>
/**
* Decorates the runner function making sure all errors it can produce are
* tagged with `edge-server` so they can properly be rendered in dev.
*/
function withTaggedErrors(fn: RunnerFn): RunnerFn {
if (process.env.NODE_ENV === 'development') {
const { getServerError } =
require('../../dev/node-stack-frames') as typeof import('../../dev/node-stack-frames')
return (params) =>
fn(params)
.then((result) => ({
...result,
waitUntil: result?.waitUntil?.catch((error) => {
// TODO: used COMPILER_NAMES.edgeServer instead. Verify that it does not increase the runtime size.
throw getServerError(error, 'edge-server')
}),
}))
.catch((error) => {
// TODO: used COMPILER_NAMES.edgeServer instead
throw getServerError(error, 'edge-server')
})
}
return fn
}
export async function getRuntimeContext(
params: Omit<RunnerFnParams, 'request'>
): Promise<EdgeRuntime<any>> {
const { runtime, evaluateInContext } = await getModuleContext({
moduleName: params.name,
onWarning: params.onWarning ?? (() => {}),
onError: params.onError ?? (() => {}),
useCache: params.useCache !== false,
edgeFunctionEntry: params.edgeFunctionEntry,
distDir: params.distDir,
})
if (params.incrementalCache) {
runtime.context.globalThis.__incrementalCacheShared = true
runtime.context.globalThis.__incrementalCache = params.incrementalCache
}
// expose router server context for access to dev handlers like
// logErrorWithOriginalStack
;(runtime.context.globalThis as any as typeof routerServerGlobal)[
RouterServerContextSymbol
] = routerServerGlobal[RouterServerContextSymbol]
if (params.serverComponentsHmrCache) {
runtime.context.globalThis.__serverComponentsHmrCache =
params.serverComponentsHmrCache
}
for (const paramPath of params.paths) {
evaluateInContext(paramPath)
}
return runtime
}
export const run = withTaggedErrors(async function runWithTaggedErrors(params) {
const runtime = await getRuntimeContext(params)
const edgeFunction: (args: {
request: RequestData
}) => Promise<FetchEventResult> = (
await runtime.context._ENTRIES[`middleware_${params.name}`]
).default
const cloned = !['HEAD', 'GET'].includes(params.request.method)
? params.request.body?.cloneBodyStream()
: undefined
const KUint8Array = runtime.evaluate('Uint8Array')
const urlInstance = new URL(params.request.url)
urlInstance.searchParams.delete(NEXT_RSC_UNION_QUERY)
params.request.url = urlInstance.toString()
const headers = new Headers()
for (const [key, value] of Object.entries(params.request.headers)) {
headers.set(key, value?.toString() ?? '')
}
try {
let result: FetchEventResult | undefined = undefined
const builtinRequestCtx: BuiltinRequestContextValue = {
...getBuiltinRequestContext(),
// FIXME(after):
// arguably, this is an abuse of "@next/request-context" --
// it'd make more sense to simply forward its existing value into the sandbox (in `createModuleContext`)
// but here we're using it to just pass in `waitUntil` regardless if we were running in this context or not.
waitUntil: params.request.waitUntil,
}
await edgeSandboxNextRequestContext.run(builtinRequestCtx, () =>
requestStore.run({ headers }, async () => {
result = await edgeFunction({
request: {
...params.request,
body:
cloned &&
requestToBodyStream(runtime.context, KUint8Array, cloned),
},
})
for (const headerName of FORBIDDEN_HEADERS) {
result.response.headers.delete(headerName)
}
})
)
if (!result) throw new Error('Edge function did not return a response')
return result
} finally {
await params.request.body?.finalize()
}
})
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