elm-pages-v3-beta/examples/pokedex/adapter.js

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const fs = require("fs");
async function run({
renderFunctionFilePath,
routePatterns,
apiRoutePatterns,
}) {
ensureDirSync("functions/render");
ensureDirSync("functions/server-render");
fs.copyFileSync(
renderFunctionFilePath,
"./functions/render/elm-pages-cli.js"
);
fs.copyFileSync(
renderFunctionFilePath,
"./functions/server-render/elm-pages-cli.js"
);
const processedHtml = fs.readFileSync(
"elm-stuff/elm-pages/index.html",
"utf-8"
);
fs.writeFileSync(
"./functions/render/index.js",
rendererCode(true, processedHtml)
);
fs.writeFileSync(
"./functions/server-render/index.js",
rendererCode(false, processedHtml)
);
// TODO rename functions/render to functions/fallback-render
// TODO prepend instead of writing file
const apiServerRoutes = apiRoutePatterns.filter(isServerSide);
ensureValidRoutePatternsForNetlify(apiServerRoutes);
// TODO filter apiRoutePatterns on is server side
// TODO need information on whether api route is odb or serverless
const apiRouteRedirects = apiServerRoutes
.map((apiRoute) => {
if (apiRoute.kind === "prerender-with-fallback") {
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return `${apiPatternToRedirectPattern(
apiRoute.pathPattern
)} /.netlify/builders/render 200`;
} else if (apiRoute.kind === "serverless") {
return `${apiPatternToRedirectPattern(
apiRoute.pathPattern
)} /.netlify/functions/server-render 200`;
} else {
throw "Unhandled 2";
}
})
.join("\n");
const redirectsFile =
routePatterns
.filter(isServerSide)
.map((route) => {
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if (route.kind === "prerender-with-fallback") {
return `${route.pathPattern} /.netlify/builders/render 200
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${route.pathPattern}/content.dat /.netlify/builders/render 200`;
} else {
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return `${route.pathPattern} /.netlify/functions/server-render 200
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${route.pathPattern}/content.dat /.netlify/functions/server-render 200`;
}
})
.join("\n") +
"\n" +
apiRouteRedirects +
"\n";
fs.writeFileSync("dist/_redirects", redirectsFile);
}
function ensureValidRoutePatternsForNetlify(apiRoutePatterns) {
const invalidNetlifyRoutes = apiRoutePatterns.filter((apiRoute) =>
apiRoute.pathPattern.some(({ kind }) => kind === "hybrid")
);
if (invalidNetlifyRoutes.length > 0) {
throw (
"Invalid Netlify routes!\n" +
invalidNetlifyRoutes
.map((value) => JSON.stringify(value, null, 2))
.join(", ")
);
}
}
function isServerSide(route) {
return (
route.kind === "prerender-with-fallback" || route.kind === "serverless"
);
}
(async function () {
try {
await run({
renderFunctionFilePath: "./elm-stuff/elm-pages/elm.js",
routePatterns: JSON.parse(fs.readFileSync("dist/route-patterns.json")),
apiRoutePatterns: JSON.parse(fs.readFileSync("dist/api-patterns.json")),
});
console.log("Success - Adapter script complete");
} catch (error) {
console.error("ERROR - Adapter script failed");
console.error(error);
process.exit(1);
}
})();
/**
* @param {boolean} isOnDemand
* @param {string} processedHtml
*/
function rendererCode(isOnDemand, processedHtml) {
return `const path = require("path");
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const cookie = require("cookie");
const busboy = require("busboy");
const processedHtml = ${JSON.stringify(processedHtml)};
${
isOnDemand
? `const { builder } = require("@netlify/functions");
exports.handler = builder(render);`
: `
exports.handler = render;`
}
/**
* @param {import('aws-lambda').APIGatewayProxyEvent} event
* @param {any} context
*/
async function render(event, context) {
const requestTime = new Date();
console.log(JSON.stringify(event));
global.staticHttpCache = {};
const compiledElmPath = path.join(__dirname, "elm-pages-cli.js");
const renderer = require("../../../../generator/src/render");
const preRenderHtml = require("../../../../generator/src/pre-render-html");
try {
const basePath = "/";
const mode = "build";
const addWatcher = () => {};
const renderResult = await renderer(
basePath,
require(compiledElmPath),
mode,
event.path,
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await reqToJson(event, requestTime),
addWatcher,
false
);
console.log("@@@renderResult", JSON.stringify(renderResult, null, 2));
const statusCode = renderResult.is404 ? 404 : renderResult.statusCode;
if (renderResult.kind === "bytes") {
return {
body: Buffer.from(renderResult.contentDatPayload.buffer).toString("base64"),
isBase64Encoded: true,
headers: {
"Content-Type": "application/octet-stream",
"x-powered-by": "elm-pages",
...renderResult.headers,
},
statusCode,
};
} else if (renderResult.kind === "api-response") {
const serverResponse = renderResult.body;
return {
body: serverResponse.body,
multiValueHeaders: serverResponse.headers,
statusCode: serverResponse.statusCode,
isBase64Encoded: serverResponse.isBase64Encoded,
};
} else {
console.log('@rendering', preRenderHtml.replaceTemplate(processedHtml, renderResult.htmlString))
return {
body: preRenderHtml.replaceTemplate(processedHtml, renderResult.htmlString),
headers: {
"Content-Type": "text/html",
"x-powered-by": "elm-pages",
...renderResult.headers,
},
statusCode,
};
}
} catch (error) {
console.error(error);
return {
body: \`<body><h1>Error</h1><pre>\${error.toString()}</pre></body>\`,
statusCode: 500,
headers: {
"Content-Type": "text/html",
"x-powered-by": "elm-pages",
},
};
}
}
/**
* @param {import('aws-lambda').APIGatewayProxyEvent} req
* @param {Date} requestTime
* @returns {Promise<{ method: string; hostname: string; query: Record<string, string | undefined>; headers: Record<string, string>; host: string; pathname: string; port: number | null; protocol: string; rawUrl: string; }>}
*/
function reqToJson(req, requestTime) {
return new Promise((resolve, reject) => {
if (
req.httpMethod && req.httpMethod.toUpperCase() === "POST" &&
req.headers["content-type"] &&
req.headers["content-type"].includes("multipart/form-data") &&
req.body
) {
try {
console.log('@@@1');
const bb = busboy({
headers: req.headers,
});
let fields = {};
bb.on("file", (fieldname, file, info) => {
console.log('@@@2');
const { filename, encoding, mimeType } = info;
file.on("data", (data) => {
fields[fieldname] = {
filename,
mimeType,
body: data.toString(),
};
});
});
bb.on("field", (fieldName, value) => {
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console.log("@@@field", fieldName, value);
fields[fieldName] = value;
});
// TODO skip parsing JSON and form data body if busboy doesn't run
bb.on("close", () => {
console.log('@@@3');
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console.log("@@@close", fields);
resolve(toJsonHelper(req, requestTime, fields));
});
console.log('@@@4');
if (req.isBase64Encoded) {
bb.write(Buffer.from(req.body, 'base64').toString('utf8'));
} else {
bb.write(req.body);
}
} catch (error) {
console.error('@@@5', error);
resolve(toJsonHelper(req, requestTime, null));
}
} else {
console.log('@@@6');
resolve(toJsonHelper(req, requestTime, null));
}
});
}
function toJsonHelper(req, requestTime, multiPartFormData) {
let jsonBody = null;
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try {
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jsonBody = req.body && JSON.parse(req.body);
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} catch (jsonParseError) {}
return {
method: req.httpMethod,
hostname: "TODO",
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query: req.queryStringParameters || {},
headers: req.headers,
host: "", // TODO
pathname: req.path,
port: 80, // TODO
protocol: "https", // TODO
rawUrl: "", // TODO
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body: req.body,
requestTime: Math.round(requestTime.getTime()),
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cookies: cookie.parse(req.headers.cookie || ""),
// TODO skip parsing if content-type is not x-www-form-urlencoded
formData: paramsToObject(new URLSearchParams(req.body || "")),
multiPartFormData: multiPartFormData,
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jsonBody: jsonBody,
};
}
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function paramsToObject(entries) {
const result = {};
for (const [key, value] of entries) {
result[key] = value || "";
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}
return result;
}
`;
}
/**
* @param {fs.PathLike} dirpath
*/
function ensureDirSync(dirpath) {
try {
fs.mkdirSync(dirpath, { recursive: true });
} catch (err) {
if (err.code !== "EEXIST") throw err;
}
}
/** @typedef {{kind: 'dynamic'} | {kind: 'literal', value: string}} ApiSegment */
/**
* @param {ApiSegment[]} pathPattern
*/
function apiPatternToRedirectPattern(pathPattern) {
return (
"/" +
pathPattern
.map((segment, index) => {
switch (segment.kind) {
case "literal": {
return segment.value;
}
case "dynamic": {
return `:dynamic${index}`; // TODO need to assign different names for each dynamic segment?
}
default: {
throw "Unhandled segment: " + JSON.stringify(segment);
}
}
})
.join("/")
);
}