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simplify rendering of error pages

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This commit is contained in:
Rich Harris
2018-06-27 18:35:41 -04:00
parent f821c19528
commit 0aeb63a05b
1 changed files with 23 additions and 76 deletions
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99
src/middleware.ts
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@@ -162,8 +162,13 @@ function get_route_handler(App: Component, routes: RouteObject[], store_getter:
? () => fs.readFileSync(`${locations.app()}/template.html`, 'utf-8')
: (str => () => str)(fs.readFileSync(`${locations.dest()}/template.html`, 'utf-8'));
function handle_route(route: RouteObject, req: Req, res: ServerResponse) {
req.params = route.params(route.pattern.exec(req.path));
const not_found_route = routes.find((route: RouteObject) => route.error === '4xx');
const error_route = routes.find((route: RouteObject) => route.error === '5xx');
function handle_route(route: RouteObject, req: Req, res: ServerResponse, status = 200, error: Error | string = null) {
req.params = error
? {}
: route.params(route.pattern.exec(req.path));
const handlers = route.handlers[Symbol.iterator]();
@@ -174,7 +179,14 @@ function get_route_handler(App: Component, routes: RouteObject[], store_getter:
const { value: handler, done } = handlers.next();
if (done) {
handle_error(req, res, 404, 'Not found');
if (route.error) {
// there was an error rendering the error page!
res.statusCode = status;
res.end(error instanceof Error ? error.message : error);
} else {
handle_route(not_found_route, req, res, 404, 'Not found');
}
return;
}
@@ -186,7 +198,7 @@ function get_route_handler(App: Component, routes: RouteObject[], store_getter:
// preload main.js and current route
// TODO detect other stuff we can preload? images, CSS, fonts?
const link = []
.concat(chunks.main, chunks[route.id])
.concat(chunks.main, chunks[route.id] || chunks[`_${route.error}`]) // TODO this is gross
.filter(file => !file.match(/\.map$/))
.map(file => `<${req.baseUrl}/client/${file}>;rel="preload";as="script"`)
.join(', ');
@@ -197,7 +209,7 @@ function get_route_handler(App: Component, routes: RouteObject[], store_getter:
const props = { params: req.params, query: req.query, path: req.path };
let redirect: { statusCode: number, location: string };
let error: { statusCode: number, message: Error | string };
let preload_error: { statusCode: number, message: Error | string };
Promise.resolve(
mod.preload ? mod.preload.call({
@@ -205,7 +217,7 @@ function get_route_handler(App: Component, routes: RouteObject[], store_getter:
redirect = { statusCode, location };
},
error: (statusCode: number, message: Error | string) => {
error = { statusCode, message };
preload_error = { statusCode, message };
},
fetch: (url: string, opts?: any) => {
const parsed = new URL(url, `http://127.0.0.1:${process.env.PORT}${req.baseUrl ? req.baseUrl + '/' :''}`);
@@ -245,7 +257,7 @@ function get_route_handler(App: Component, routes: RouteObject[], store_getter:
store
}, req) : {}
).catch(err => {
error = { statusCode: 500, message: err };
preload_error = { statusCode: 500, message: err };
}).then(preloaded => {
if (redirect) {
res.statusCode = redirect.statusCode;
@@ -255,8 +267,8 @@ function get_route_handler(App: Component, routes: RouteObject[], store_getter:
return;
}
if (error) {
handle_error(req, res, error.statusCode, error.message);
if (preload_error) {
handle_route(error_route, req, res, preload_error.statusCode, preload_error.message);
return;
}
@@ -370,84 +382,19 @@ function get_route_handler(App: Component, routes: RouteObject[], store_getter:
}
}
} catch (error) {
handle_error(req, res, 500, error);
handle_route(error_route, req, res, 500, error || 'Internal server error');
}
}
next();
}
const not_found_route = routes.find((route: RouteObject) => route.error === '4xx');
const error_route = routes.find((route: RouteObject) => route.error === '5xx');
function handle_error(req: Req, res: ServerResponse, statusCode: number, message: Error | string) {
res.statusCode = statusCode;
res.setHeader('Content-Type', 'text/html');
const error = message instanceof Error ? message : new Error(message);
const not_found = statusCode >= 400 && statusCode < 500;
const route = not_found
? not_found_route
: error_route;
function render_page({ head, css, html }) {
const page = template()
.replace('%sapper.base%', `<base href="${req.baseUrl}/">`)
.replace('%sapper.scripts%', `<script>__SAPPER__={baseUrl: "${req.baseUrl}"}</script><script src='${req.baseUrl}/client/${get_chunks().main}'></script>`)
.replace('%sapper.html%', html)
.replace('%sapper.head%', `<noscript id='sapper-head-start'></noscript>${head}<noscript id='sapper-head-end'></noscript>`)
.replace('%sapper.styles%', (css && css.code ? `<style>${css.code}</style>` : ''));
res.end(page);
}
function handle_notfound() {
const title: string = not_found
? 'Not found'
: `Internal server error: ${error.message}`;
render_page({ head: '', css: null, html: title });
}
if (route) {
const handlers = route.handlers[Symbol.iterator]();
function next() {
const { value: handler, done } = handlers.next();
if (done) {
handle_notfound();
} else if (handler.type === 'page') {
render_page(handler.module.render({
status: statusCode,
error
}, {
store: store_getter && store_getter(req)
}));
} else {
const handle_method = mod[method_export];
if (handle_method) {
handle_method(req, res, next);
} else {
next();
}
}
}
next();
} else {
handle_notfound();
}
}
return function find_route(req: Req, res: ServerResponse) {
for (const route of routes) {
if (!route.error && route.pattern.test(req.path)) return handle_route(route, req, res);
}
handle_error(req, res, 404, 'Not found');
handle_route(not_found_route, req, res, 404, 'Not found');
};
}